


       



       .














                                   Cook

                         A File Construction Tool




                                User Guide







                               Peter Miller

                         [4mmillerp@canb.auug.org.au[0m

































       .












       This document describes Cook version 2.21
       and was prepared 16 March 2014.






       This document describing the Cook program, and the Cook
       program itself, are
       Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994,
       1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Peter Miller;
       All rights reserved.

       This program is free software; you can redistribute it
       and/or modify it under the terms of the GNU General Public
       License as published by the Free Software Foundation; either
       version 2 of the License, or (at your option) any later
       version.

       This program is distributed in the hope that it will be
       useful, but WITHOUT ANY WARRANTY; without even the implied
       warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the GNU General Public License for more
       details.

       You should have received a copy of the GNU General Public
       License along with this program; if not, write to the Free
       Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA 02111, USA.



















       Cook                                              User Guide



       [4m1.[24m  [4mIntroduction[0m

       This document describes [1mcook[22m, a maintenance tool designed to
       construct files.  [1mCook [22mmay be used to maintain consistency
       between executable files and the associated source files
       that are used to generate them.  The consistency is
       designated by the relative last-modified times of files and
       is thus automatically adjusted each time a file is edited,
       compiled or otherwise modified.  [1mCook [22mvalidates the
       consistency of a system of files and executes all commands
       necessary to maintain that consistency.

       [1mCook [22mis a tool for constructing files.  It is given a set of
       files to create, and instructions detailing how to construct
       them.  In any non-trivial program there will be
       prerequisites to performing the actions necessary to
       creating any file, such as extraction from a source-control
       system.  [1mCook [22mprovides a mechanism to define these.

       When a program is being developed or maintained, the
       programmer will typically change one file of several which
       comprise the program.  [1mCook [22mexamines the last-modified times
       of the files to see when the prerequisites of a file have
       changed, implying that the file needs to be recreated as it
       is logically out of date.

       [1mCook [22malso provides a facility for implicit recipes, allowing
       users to specify how to form a file with a given suffix from
       a file with a different suffix.  For example, to create
       [4mfilename[24m[1m.o [22mfrom [4mfilename[24m[1m.c[0m

       [4m1.1[24m  [4mWhy[24m [4mYou[24m [4mWant[24m [4mTo[24m [4mUse[24m [4mCook[0m

          o Cook is a replacement for the traditional [4mmake[24m(1) tool.

          o There is a [4mmake2cook[24m utility included in the
            distribution to help convert makefiles into cookbooks.

          o Cook is more powerful than the traditional [4mmake[24m tool.

          o Cook has true variables, not simple macros.

          o Cook has a simple but powerful string-based description
            language with many built-in functions.  This allows
            sophisticated filename specification and manipulation
            without loss of readability or performance.

          o Cook has user defined functions.

          o Cook can build in parallel.

          o Cook can distribute builds across your LAN.




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          o Cook is able to build your project with multiple
            parallel threads, with support for rules which must be
            single threaded.  It is possible to distribute parallel
            builds over your LAN, allowing you to turn your network
            into a virtual parallel build engine.

          o Cook is able to use fingerprints to supplement file
            modification times.  This allows build optimization
            without contorted rules.

          o Cook can be configured with an explicit list of primary
            source files.  This allow the dependency graph to be
            constructed faster by not going down dead ends, and
            also allows better error messages when the graph can't
            be constructed.  This requires an accurate source file
            manifest.

          o In addition to walking the dependency graph, Cook can
            turn the input rules into a shell script, or a web
            page.

          o Cook has special [4mcascade[24m dependencies, allowing
            powerful include dependency specification, amongst
            other things.

          o And Cook doesn't interpret tab differently to 8 space
            characters!

       If you are putting together a source-code distribution and
       planning to write a makefile, consider writing a cookbook
       instead.  Although Cook takes a day or two to learn, it is
       much more powerful and a bit more intuitive than the
       traditional [4mmake[24m(1) tool.

       [4m1.2[24m  [4mHow[24m [4mto[24m [4mUse[24m [4mthis[24m [4mManual[0m

       This manual is divided into two parts.

       The first part is tutorial introduction to [1mcook[22m.  This part
       runs from chapter 4 to chapter 5.

       The second part is for reference and details precisely how
       [1mcook [22mworks.  This part runs from chapter 6 to chapter 14.

       Users familiar with other programs similar to [1mcook [22mare
       advised to skim the tutorial part before diving into the
       reference part.

       [4m1.3[24m  [4mAncient[24m [4mHistory[0m

       [1mCook [22mwas originally developed because I was marooned on an
       operating system without anything even vaguely resembling
       [4mmake[24m(1).  This was in 1988.  Since I had to write my own, I
       added a few improvements.  When I finally escaped back to


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       UNIX, in 1990, it took only two days to port [1mcook [22mto
       SystemV.  I have since deleted all code for that original
       operating system, although clues to its identity are still
       present.

       After I had [1mcook [22mup on UNIX, the progress the world had made
       caught up with me.  It was gratifying that many of the
       features other make-oid authors had thought necessary were
       either already present, or easily and seamlessly added.

       [1mCook [22mwas written with portability in mind.  This does not
       means it is entirely portable, but it comes close.  [1mCook [22mhas
       been tested on numerous UNIX flavors.  This was made much
       simpler in 1994 when I started using the GNU Autoconf
       utility.  This means that when you obtain the sources for
       Cook, all you have to do is run the [4mconfigure[24m script
       included in the distribution and Cook will be configured for
       your system.  See the BUILDING file in the source
       distribution for more information.

       In 1996 Cook had internationalization support added, so that
       users could have error messages and other warning and
       informational messages printed in their native language.
       This was made possible by the GNU Gettext utilities.

       In 1997 Cook had a major re-write of significant portions of
       its inference engine.  This enabled the addition of parallel
       processing support, and simplified adding user-defined
       functions to the cookbook language.



























       Peter Miller                                          Page 3





       Cook                                              User Guide



       [4m2.[24m  [4mCook[24m [4mfrom[24m [4mthe[24m [4mOutside[0m

       This chapter is part of the tutorial on how to use the [1mcook[0m
       program.  It focuses on how to use [1mcook[22m, without needing to
       know how [1mcook [22mworks internally.

       [4m2.1[24m  [4mWhat[24m [4mcan[24m [4mcook[24m [4mdo[24m [4mfor[24m [4mme?[0m

       By far the most common use of cook, by experts and beginners
       alike, is to issue the command
            cook
       and cook will consult its cookbook to see what needs to be
       done.

       In general, [1mcook [22mis used to take a set of files and chew on
       them in some way to produce another set of files; such as
       the source files for a program, and how to turn them into
       the executable program file.  In order for [1mcook [22mto do
       anything useful, it needs to know what to do.  "What to do"
       is contained in a file called [4mHowto.cook[24m in the same
       directory as the files it is going to work on.  You need to
       execute the  cook command in the same directory as all of
       the files.

       [4m2.2[24m  [4mWhat[24m [4mis[24m [4mcook[24m [4mdoing?[0m

       The [4mHowto.cook[24m file was written by the same person who wrote
       the source files.  It contains a set of recipes; each of
       which, among other things, contain commands for how to
       manipulate the files.  The [1mcook [22mprogram echos each of the
       commands it is about to execute, so that you can watch what
       it is doing as it goes.

       If the [4mHowto.cook[24m file contained only commands, you would be
       better off using a shell script.  In addition to the
       commands is information telling [1mcook [22mwhich files need to be
       constructed before other files can be, and from this
       information [1mcook [22mdetermines the order in which to execute
       the commands.  Also, [1mcook [22mexamines other information to
       determine which commands it need not do, because the
       associated files are already up-to-date.

       [4m2.3[24m  [4mWhat[24m [4mcan[24m [4mcook[24m [4malways[24m [4mdo?[0m

       If you are in a directory with a [4mHowto.cook[24m file, you can
       expect a few common requests to work

       cook clobber   This command can be expected to remove any
                      files from the directory which [1mcook [22mis able
                      to reconstruct.

       cook all       This is the default action, and so can be
                      obtained by a simple cook request.  It causes
                      [1mcook [22mto construct some specific file or set


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                      of files.

       cook clean     This is similar to "cook clobber" above, but
                      it only removes intermediate files, and not
                      not the final file or files which "cook all"
                      constructs.

       In addition to the above, many [4mHowto.cook[24m files will also
       define

       cook install   If a program or library or document is
                      constructed in the directory, the this
                      command will install it into the correct
                      place in the system.

       cook uninstall The reverse of the above, it removes
                      something from the system.

       [4m2.4[24m  [4mIf[24m [4msomething[24m [4mgoes[24m [4mwrong[0m

       Most errors while [1mcook [22mis constructing file are caused by
       errors in the source files, and not the [4mHowto.cook[24m file.  In
       general, you can fix the problems in the source files, and
       execute the [1mcook [22mcommand again, and [1mcook [22mwill resume from
       the command which incurred the error.

       To help you while editing the files with the errors, [1mcook[0m
       keeps a listing file of all the commands it executed, and
       any output of those commands, in a file called [4mHowto.list[24m in
       the current directory.

       You may want [1mcook [22mto find all the errors it can before you
       do any editing, do do this, use the [1m-Continue [22moption (it may
       be abbreviated to [1m-c [22mfor convenience).

       [4m2.5[24m  [4mThe[24m [4mReference[24m [4mManual[0m

       For more information about the command line arguments and
       options of the various commands mentioned, you should
       consult the on-line manual pages.  The Cook Reference Manual
       is also a good source of this information, and is available
       from the same place as you obtained this manual.














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       [4m3.[24m  [4mCook[24m [4mfrom[24m [4ma[24m [4mCookbook[0m

       This chapter describes the contents and meaning of a
       cookbook, a file which contains information [1mcook [22mneeds to do
       its job.  It focuses on what a cookbook looks like, and
       touches on a few areas of how [1mcook [22mworks does its job.

       [4m3.1[24m  [4mWhat[24m [4mdoes[24m [4mCook[24m [4mdo?[0m

       The basic building block for [1mcook [22mis the concept of a
       [4mrecipe[24m.  A recipe has three parts:

         1.  one or more files which the recipe constructs, known
             as the [4mtargets[24m of the recipe

         2.  zero or more files which are used by the recipe to
             construct the target, known as the [4mingredients[24m of the
             recipe

         3.  one or more commands to execute which construct the
             targets from the ingredients, known as the [4mbody[24m of the
             recipe.

       When a number of recipes are given, some recipes may
       describe how to cook the ingredients of other recipes.  When
       [1mcook [22mis asked to construct a particular target it
       automatically determines the correct order to perform the
       recipe bodies to cook the requested target.

       [1mCook [22mwould not be especially useful if you had to give
       explicit recipes for how to cook every little thing.  As a
       result, [1mcook [22mhas the concept of an [4mimplicit[24m recipe.  An
       implicit recipe is very similar to an explicit recipe,
       except that the targets and ingredients of the recipe are
       [4mpatterns[24m to be matched to file names, rather than explicit
       file names.  This means it is possible to write a recipe,
       for example which constructs a files with a name ending in
       `[1m.o[22m' from a file of the same name, but ending in `[1m.c[22m' rather
       than `[1m.o[22m'.

       In addition to recipes, [1mcook [22mneeds to know [4mwhen[24m to construct
       targets from ingredients.  [1mCook [22mhas been designed to cook as
       little as possible.  "As little as possible" is determined
       by examining when each file was last modified, and only
       constructing targets when that are out of date with the
       ingredients.


       [4m3.1.1[24m  [4mWhen[24m [4mis[24m [4mCook[24m [4museful?[0m
       From the above description, [1mcook [22mmay be described as a tool
       for maintaining consistency of sets of files.





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       [4m3.1.2[24m  [4mWhen[24m [4mis[24m [4mCook[24m [4mnot[24m [4museful?[0m
       Cook is not useful for maintaining consistency of sets of
       things which are [4mwithin[24m files and thus [1mcook [22mis unable to
       determine when they were modified.  For example, [1mcook [22mis not
       useful for maintaining consistency of sets of records within
       a database.


       [4m3.2[24m  [4mHow[24m [4mdo[24m [4mI[24m [4mtell[24m [4mCook[24m [4mwhat[24m [4mto[24m [4mdo?[0m

       Sets of recipes are gathered together into cookbooks.  When
       [1mcook [22mis executed it looks for a cookbook of the name
       [4mHowto.cook[24m in the current directory.  If you did not name a
       file to be constructed on the command line, the first target
       in the cookbook will be constructed.

       The best way to understand how to write recipes is an
       example.  In this example, a  program, [4mprog[24m, is composed of
       three files: [4mfoo.c[24m, [4mbar.c[24m and [4mbaz.c[24m.  To inform [1mcook [22mof
       this, the cookbook
            #include "c"

            prog: foo.o bar.o baz.o
            {
                    cc -o prog foo.o bar.o baz.o;
            }
       is sufficient for [4mprog[24m to be constructed.

       This cookbook has two parts.  The line
            #include "c"
       tells [1mcook [22mto refer to a system cookbook which tells it,
       among other things, how to construct a [4msomething[24m[1m.o [22mfile from
       a [4msomething[24m[1m.c [22mfile.

       The second part is a recipe.  The first line of this recipe
            prog: foo.o bar.o baz.o
                ...
       names the target, [4mprog[24m, and the ingredients, [4mfoo.o[24m, [4mbar.o[0m
       and [4mbaz.o[24m.

       The next three lines
            ...
            {
                    cc -o prog foo.o bar.o baz.o;
            }
       are the recipe body, which consists of a single [4mcc[24m(1)
       command to be executed.  Recipe bodies are always within [1m{[0m
       curly braces [1m}[22m, and commands always end with a semicolon
       ([1m;[22m).

       Thus, to update [4mprog[24m after any of the source files have been
       edited, it is only necessary to issue the command
            cook prog
       This could be simplified further, because [1mcook [22mwill cook the


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       targets of the first recipe by default; in this case, [4mprog[24m.

       The power of cook becomes more apparent when include files
       are considered.  If the files [4mfoo.c[24m and [4mbaz.c[24m include the
       file [4mdefs.h[24m, this would automatically be detected by [1mcook[22m.
       If [4mdefs.h[24m were to be edited, and [1mcook [22mre-executed, this
       would cause [1mcook [22mto recompile both [4mfoo.c[24m and [4mbaz.c[24m, and
       relink [4mprog.[24m  The information about how to turn [1m.c [22mfiles
       into [1m.o [22mfiles came from the ``#include "c"'' line, which
       read in the C recipes distributed with Cook.

       [4m3.2.1[24m  [4mThe[24m [4mcommon[24m [4mprogram[24m [4mcase[0m
       The above example may be simplified even further.  If the
       four files [4mfoo.c[24m, [4mbar.c[24m, [4mbaz.c[24m and [4mdefs.h[24m all resided in a
       directory with a path of [4m/some/where/prog[24m, then the
       [4mHowto.cook[24m file in that directory need only contain
            #include "c"
            #include "program"
       for [4mprog[24m to be cooked.  This is because the "program"
       cookbook looks for all of the [4msomething[24m[1m.c [22mfiles in the
       current directory, compiles them all, and links them into a
       program named after the current directory.

       The default target in the "program" cookbook is called [4mall[24m.
       The ingredient of [4mall[24m is the program named after the current
       directory.  Two other targets are supplied by this cookbook:

       clean removes all of the [4msomething[24m[1m.o [22mfiles from the current
            directory.

       clobber removes the program named after the current
            directory, and also removes all of the [4msomething[24m[1m.o[0m
            files from the current directory.

       [4m3.3[24m  [4mCreating[24m [4ma[24m [4mCookbook[0m

       To use [1mcook [22myou will usually need to define a cookbook, by
       creating a file, usually called [4mHowto.cook[24m in the current
       directory, with your favorite text editor.

       This file has a specific format.  The format has been
       designed to be easy to learn, even for the casual user.
       Much of the power of [1mcook [22mis contained in how it works,
       without complicating the format of the cookbook.












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       Example of what a cookbook looks like are scattered
       throughout this document.  The following example is the
       entire cookbook for many programs, some quite large:
            #include "c"
            #include "yacc"
            #include "usr.local"
            #include "program"
       As you can see, even for many complex programs, the cookbook
       is remarkably simple.















































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       [4m4.[24m  [4mCooking[24m [4min[24m [4mParallel[0m

       Cook is able to use the dependency information in the
       cookbook to schedule more than one recipe body at once,
       where they are independent.  In large projects this is
       almost always possible.

       Parallel processing is of most use on multi-processor
       systems.  There are cases, however, when running two jobs at
       once on a workstation can take advantage of disk or network
       latencies.

       Parallel processing requires more resources than the simple
       case.  Because more commands are running, more CPU is
       required, but also more virtual memory and more temporary
       file space.  You need to be sure that cooking in parallel is
       a sensible thing to be doing.

       [4m4.1[24m  [4mCommand[24m [4mLine[24m [4mOption[0m

       The -PARallel option is used to tell Cook to run the recipe
       bodies in parallel.  By default, 4 jobs run in parallel.
       You may specify the number of jobs after the option ([4me.g.[0m
       --par=2) if you wish.

       [4m4.2[24m  [4mCookbook[24m [4mVariable[0m

       It is also possible to set the number of jobs from within
       the cookbook by using the parallel_jobs variable.  This can
       be used to automate the selection of the number of jobs,
       based on the current host name:
            if [not [defined parallel_jobs]] then
            {
                    host = [os node];
                    if [in [host] cerberus] then
                            parallel_jobs = 3;
                    else if [in [host] zaphod] then
                            parallel_jobs = 2;
                    else if [in [host] hydra] then
                            parallel_jobs = 8;
            }
       In this way, the number of jobs will be set appropriately
       for each machine, provided the number of jobs was not
       already set by the command line option.

       [4m4.3[24m  [4mRecipe[24m [4mWriting[0m

       Most recipes run in parallel without difficulty, however
       some will require special treatment.  The problems arise
       from conflict for resources - usually temporary files.






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       The simplest example of this is [4myacc[24m(1).  The output
       filenames are hard-coded, even when you write a more general
       recipe:
            %.c: %.y
                    single-thread yy.tab.c
            {
                    [yacc] [yacc_flags] %.y;
                    sed "'s/[yY][yY]/%_/g'" yy.tab.c > [target];
                    rm yy.tab.c;
            }
       Replacing the YY is a common method for getting more than
       one yacc grammar into a program.  We run into trouble with
       the yy.tab.c file because every one of the yacc grammars
       will need to use the same temporary file name.

       The single-thread clause tells cook to find something else
       to do if it discovers that it wants do two of these at the
       same time.

       The temporary file name may not be so evident as in the yacc
       case.  The GNU Autoconf utilities use a number of temporary
       files in the current directory, but none of them appear in
       the text of the recipes.
            %: %.in: config.status
                    single-thread conftest.subs
            {
                    CONFIG_FILES\=[target] CONFIG_HEADERS\= config.status;
            }
       It is common, if your project uses GNU Autoconf, to generate
       several files in this way.  Once the config.status script is
       produced, all of these files will then be candidates for
       cook to generate - but they can only be done one at a time.

       Other resources, such as tape drives, can also be described
       in the single-thread clause.  You can do this by device name
       ([4me.g.[24m /dev/rmt/0) or by some descriptive string.  The single
       threading is performed by mutually exclusive string sets,
       not by inode.

       [4m4.3.1[24m  [4mConcurrent[24m [4mExecution[24m [4mThreads[0m
       Each recipe, when its actions are executed, is executed
       within an execution thread.  Execution threads share almost
       everything in common; this includes all of the variables,
       the state of the ``set'' statement, the stat cache, [4metc[24m.

       If you need to create variable names, or temporary file
       names, which are unique to a thread, use the [thread-id]
       variable.  This variable has a unique value for the life of
       a thread.  No other concurrent thread will have the same
       value.

       Note, however, that the [thread-id] values of completed
       threads will be re-used; this ensures that when it is used
       to construct variable names, the variables will be re-used.


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       This prevents memory bloat when cooking large projects.

       [4m4.4[24m  [4mFile[24m [4mLocking[0m

       The above discussion applies to utilities which perform no
       file locking, and thus cannot detect or sequence multiple
       accesses to a resource.  Other programs, such as those which
       access databases, may have quite capable file locking
       mechanisms and are able to manage multiple parallel updates
       on their own, obviating the need for the single-thread
       clause.

       [4m4.5[24m  [4mVirtual[24m [4mMachine[0m

       It is possible to simulate a parallel machine if you are on
       a network.  Cook is able to distribute tasks to computers on
       a network, if it is given sufficient information.

       The first information Cook requires is the list of machines.
       This is done using the parallel_hosts variable.  [1mNote: [22mThe
       tasks will be distributed amongst these machines independent
       of the setting of the parallel_jobs variable.  [4mi.e.[24m even if
       you are not doing parallel processing.
            parallel_hosts = larry curly moe;
       If you want to give one machine more wieghting than the
       others (say, because it is twice as fast) you simply name it
       more than once.  Cook will use these names in round-robin
       fashion.

       [4m4.5.1[24m  [4mRemote[24m [4mShell[24m [4mCommand[0m
       Cook uses the Berkeley [4mrsh[24m(1) command to invoke the remote
       command.  You can set the command, or the command and some
       options, using the parallel_rsh variable.  The default value
       is
            parallel_rsh = rsh;
       In order to work in a useful way, Cook makes some
       assumptions about your environment and your account:

          o That your system administrators allow [4mrsh[24m(1) to be used
            on your network.

          o That your account name is the same on [4mall[24m machines
            (otherwise not even the rsh -l [4mlogin-name[24m option will
            help).

          o That the /etc/hosts.equiv file, or your ~/.rhosts file,
            is set on [4mall[24m machines so that you don't need to give a
            password.

          o That all of the necessary files and directories are
            mounted in exactly the same place on all of the
            machines; and that they are [4mthe[24m [4msame[24m [4mfiles[24m on all
            machines, via NFS or similar.  Automounters can make
            this especially messy.


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          o That your account start-up scripts set the necessary
            environment settings, [4me.g.[24m command search PATH, without
            any intervention required.

          o That all of the machines are of the same architecture,
            or that the architecture doesn't matter.

          o That the system time is synchronised on all machines,
            using [4mrdate[24m(1) from [4mcron[24m(8), or using NTP, or similar.

       [4m4.5.2[24m  [4mLimitations[0m
       There are some inherent limitations in the [4mrsh[24m(1) protocol.

          o Your current environment variable settings are not
            transferred across.  Neither are [4mulimit[24m settings, [4metc[24m.
            If any are important, you need to write the cookbook to
            explicitly replicate them.

          o The exit status of the remote command is not reported
            in the exit status of the [4mrsh[24m(1) command1.  There are
            internal contortions used by Cook to obtain the exit
            status; error about mysteriously named files usually
            indicate that one or more of the above assumptions is
            being broken.

       [4m4.5.3[24m  [4mSecure[24m [4mShell[0m
       It is possible to use the Secure Shell (ssh) instead of
       Remote Shell (rsh).  This gives you fully authenticated,
       fully encrypted sessions, both over your intranet and even
       over the Internet.  Once you have it installed and
       configured correctly, you simply replace the [4mrsh[24m command in
       the above examples with the [4mssh[24m command.

       This is accomplised by setting
            parallel_rsh = "ssh";
       Somewhere near the top of your cookbook.

       [4m4.5.4[24m  [4mHost[24m [4mBinding[0m
       In some cases, such as licensing conditions, some commands
       will only run on a limited set of hosts.  Rather than
       perform all commands on those hosts, it is possible to bind
       recipes to specific hosts.  This binding overrides the
       parallel_hosts variable.
            %.c: %.esql
                    host-binding shylock
            {
                    esql %.esql > [target];
            }
       This example says that the embedded SQL preprocessor is only

       ____________________

       1. The  Berkeley  sources certainly don't contain code to do
          this.   Do  any  other  vendors  have   a   more   useful
          implementation?

       Peter Miller                                         Page 13





       Cook                                              User Guide



       to be run on the database server called ``shylock'',
       probably due to usurious licensing fees.  However, you may
       want to perform your other development activities on more
       lightly loaded machines; this clause only applies to this
       one recipe, other recipes behave as normal.

       The host-binding clause may have more than one host named,
       and they will be used in round-robin fashion.  This is a
       recipe-level variant of the parallel_hosts variable.

       The host-binding clause will apply independent of the
       setting of the settings parallel_jobs and parallel_hosts
       variables.

       The recipe level host-binding overrides the cookbook level
       parallel_hosts when determining which remote hosts should be
       used.

       [4m4.5.5[24m  [4mLoad[24m [4mBalancing[0m
       It is possible to use [4mhost-binding[24m to perform load
       balancing.  This is accomplished by using [4mrup[24m(1) to discover
       which hosts are least busy, and then using this information
       to invoke the system's [4mrsh[24m(1).

       This may be accomplished by using
            parallel_rsh = "cook_rsh";
       somewhere near the top of your cookbook (or [4mcook_rsh[24m [4m-s[24m for
       secure shell).  You then give classes of hosts to the [4mhost-[0m
       [4mbinding[24m clause of the recipes, rather than specific host
       names.  See [4mcook_rsh[24m(1) for more information about setting
       up classes of hosts.

       If you still need to give specific host names to some
       recipes, [4mcook_rsh[24m(1) will cope with this, too.

       [4m4.6[24m  [4mVirtual[24m [4mMachine,[24m [4mRevisited[0m

       It is also possible to have Cook run multiple processes in
       parallel without having to know what machines are available.
       This method puts control of the network resources in the
       hands of an external program, one example of which is
       cook_rsh, distributed with Cook.

       Once you have such a virtual network defined it becomes very
       easy to build projects for multiple platforms or
       architectures in the same build.  It also allows easily
       adding new machines, or disabling machines for maintenance.
       The virtual network can be changed at any time without
       disturbing ongoing development.

       The following examples will have the form allowing multiple
       architecture builds, but of course they will work for single
       architecture as well.



       Peter Miller                                         Page 14





       Cook                                              User Guide



       [4m4.6.1[24m  [4mcook_rsh[0m
       The cook_rsh system is just one way of defining the
       capabilities of a given network in a way that a single
       program can make the best choice of machine for a given job.
       It does so in a way that is reliable and does a decent job
       of balancing loads across available machines, even with
       multiple developers doing builds at the same time.

       Each job that requested via cook_rsh picks the appropriate
       machine from those able to do the job at that instant in
       time.  In contrast to parallel_hosts or host-binding hostA
       hostB etc, it does not work from a list which was current at
       the time a cook process was started.  Thus it is less
       vulnerable to machines going off line or becoming overloaded
       as time passes.

       Currently cook_rsh uses rsh to actually execute the job, so
       requires the same network setup.  The next version may use
       multicast instead for even finer control and reliability.

       There are minor differences in the setup to use cook_rsh
       control.  The first is that Cook no longer requires a list
       of machines.  It is not necessary to set the parallel_hosts
       variable.  The parallel_rsh variable is set as:
            parallel_rsh = cook_rsh -v;
       The -v option produces information as to what machine was
       actually picked for each job.

       [4m4.6.2[24m  [4mHost[24m [4mBinding[0m
       All recipe bodies which should run in parallel need a host-
       binding setting.  Rather than list the hosts to be used we
       form a name which is used by cook_rsh to select an
       appropriate machine.  This name may include an architecture
       component and a operation component.
            %1/%.o: %.c
                    host-binding %1_C
            {
                    [%1_cc] -o [target] -c [resolve %.c];
            }

            %1/%2: [addprefix %1/ [%2_objs]]
                    host-binding %1_L
            {
                    [%1_ld] -o [target] [resolve [need]];
            }
       This example says that the compiles for a certain
       architecture should take place on any machine designated as
       a compile host for that architecture.  And linking jobs
       should go to machines designated as a link host for that
       architecture.  Of course the same machine could probably do
       both jobs, but you get to define it as you see fit, and
       change the designations from moment to moment.  Current
       designations per architecture are:



       Peter Miller                                         Page 15





       Cook                                              User Guide



       _C   Compile   (Compile source code)
       _L   Link      (link binary programs)
       _T   Test      (run automatic tests)
       _B   Build     (including cooking, or generic jobs)
       And others may be added if necessary by simple extension.

       [4m4.6.3[24m  [4mAdministration[24m [4mof[24m [4mcook_rsh[0m
       The definition of the virtual network used by cook_rsh is
       contained in just a two configuration files.  One file lists
       designations, and lists machines belonging to each
       designation.  The other is an [1mexclude [22mfile, which lists
       machines which should not be used for whatever reason.

       The designations file may be created by hand if desired but
       a utility called rate_hosts is provided that can generate
       the host_lists.pl file, possibly after being customized for
       the particular requirements of a given environment.

       The exclusion file lists machines that should never be
       selected.  The exclusion file can be edited at any time and
       adding a machine will prevent any further jobs from going
       its way.  Removing the name will again allow selection of
       that machine.  How soon a job actually goes there depends
       greatly on the network utilization.  The exclude_hosts file
       contains machine names and optional comments.  An example
       exclude_hosts file might contain:
            # list of hosts to exclude from arch_hosts lists
            # for whatever reason.
            monolith        # not a development machine - the ftp host
            namshub         # developer test station
            tiamat          # unreliable configuration
            locutus         # Being upgraded
       This is handy for maintenance on machines.  If a particular
       machine needs to be brought down you simply add its name to
       the exclusion file.  Checking its process list will tell
       when any currently running remove jobs are done.  After that
       it can safely be brought down without affecting any active
       builds.


















       Peter Miller                                         Page 16





       Cook                                              User Guide



       [4m5.[24m  [4mInclude[24m [4mFile[24m [4mDependencies[0m

       A significant factor in a cookbook accurately describing the
       dependencies in a program are the include file dependencies.
       There are three methods for doing this in Cook.  The first
       is easily understandable but is too slow to use on large
       projects, the second is a little harder to understand, but
       works well for large projects.  The third method is rather
       convoluted, but works well for projects with many thousands
       of source files and multiple simultaneous architectures
       built within the same source tree.

       The recipes here are merely examples and starting points;
       you will almost certainly need to enhance them to suit the
       needs of your projects.  Areas you will need to address
       include (a) the existence of cc -I[4mpath[24m options, (b) the use
       of search_list variable and the [resolve] function, and (c)
       heterogeneous development.  The techniques also apply to
       other languages, such as Fortran, Pascal and Roff, but each
       requires a language-specific include scanning program2.

       [4m5.1[24m  [4mThe[24m [4mManual[24m [4mMethod[0m

       Well, actually there are four methods, if you count
       maintaining the dependencies manually.  This has the serious
       defect that humans tend to [4mforget[24m to update the cookbook.
       On a large project not all developers are familiar with the
       workings of Cook, and so they shy away from updating the
       cookbook.  By finding ways to automate include dependency
       processing, we reduce the risk that a developer will forget
       to update the cookbook, and we reduce the risk that the
       cookbook's dependency information is out-of-date.

       Automatic include dependency methods described below have
       flaws, and can never replace a human for flexibility and
       domain knowledge.  On the other hand, humans have better
       things to do with their time than grope files for include
       file dependencies (like write neat software).

       [4m5.2[24m  [4mTools[0m

       All of the automated include file dependency methods
       described below use the [4mc_incl[24m(1) program included in the
       Cook distribution.  It has a number of options tailored for
       use with Cook.  For exact information about the [4mc_incl[0m
       command, consult the on-line [4mman[24m(1) system (it should have
       been installed) or the Cook Reference Manual.

       Other tools are available.  The commonest is to use the
       gcc-M option, which produces a list of include files on the

       ____________________

       2. The [4mc_incl[24m program understands Roff, you just need to use
          the -r option.

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       Cook                                              User Guide



       standard output.  Because the gcc-M output is aimed at GNU
       Make, you will need an [4mawk[24m(1) or [4msed[24m(1) script to massage
       the output into a format suitable for Cook.

       [4m5.3[24m  [4mThe[24m [4mSmall[24m [4mMethod[0m

       The easiest way to determine a file's include dependencies
       is within the recipe's ingredients.
            %.o: %.c: [collect c_incl -api %.c]
            {
                    cc -c %.c;
            }

       Note the second colon - the [4msecond[24m set of dependencies are
       only evaluated after Cook has chosen to activate the recipe
       (based on the first set).  This does not guarantee that the
       file exists yet (it may have to be generated by [4mlex[24m or
       [4myacc[24m), which is why the --Absent-Program-Ignore option is
       required.

       This method has the advantage of simplicity.  It uses a
       single recipe which reads the way recipes usually read, and
       does not contain any unusual constructs.

       There are two problems with this method.  The first is that
       it doesn't scale well.  When there are only a few source
       files, the processing burden of running [4mc_incl[24m for every [1m.c[0m
       file every time Cook is invoked is hardly noticeable.  The
       [4mc_incl[24m program caches the results of its scans, so that is
       can minimize the length of time taken, and this does help a
       little.  However projects with hundreds or thousands of
       files find even the cached performance an unreasonable
       burden; it is constantly re-calculating something which has
       not changed from one run to the next.

       The second problem is that the [4mc_incl[24m program is run when
       the dependency graph is being built, not when it is being
       walked.  This means that the [1m.c [22mfile (or a subordinate [1m.h[0m
       file) may have been out-of-date at the time.  When the graph
       is walked, it will have been regenerated, and the two sets
       of include files, those determined by [4mc_incl[24m at graph
       building time, and those seen by [4mcc[24m at graph walking time,
       may not agree - which may result in compile-time errors.

       [4m5.4[24m  [4mThe[24m [4mLarge[24m [4mMethod[0m

       For projects with large numbers of files, hundreds or even
       thousands, it is necessary to re-calculate the include file
       dependencies only when a [1m.c [22mfile changes, or a subordinate
       [1m.h [22mfile.  Ideally, Cook should access this information
       directly, rather than running a program to determine it or
       to fetch it.

       The first task is to move the information which [4mc_incl[0m


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       Cook                                              User Guide



       caches into a format that Cook can access directly; Cook can
       then read in this information as it scans the cookbook.  By
       making a separate ``dependency'' file for each [1m.c [22mfile, we
       can use existing Cook mechanisms to describe how to keep
       this file up-to-date.

       The dependency file is generated and maintained as follows:
            %.c.d: %.c
            {
                    c_incl --no-cache %.c
                            "--prefix='%.o "[target]": %.c'"
                            "--suffix='set nodefault;'"
                            -o [target];
            }

       This recipe generates a file which contains a mini-cookbook
       describing the ingredients of the [4mobject[24m file.  The
       dependencies are in terms of the object file because if any
       of the [1m.h [22mfiles change, it is the object file which is out-
       of-date, not the [1m.c [22mfile.  The mini-cookbook itself is also
       described, so that if any of the source files change, the
       mini-cookbook can be brought up-to-date again.

       The recipe for the object file is less complicated than in
       the previous section, because the mini-cookbooks supplement
       it:
            %.o: %.c
            {
                    cc -c %.c;
            }

       The only thing missing is how to get the information in the
       mini-cookbooks into the main cookbook.  This is done with an
       include directive in the cookbook itself, but a special form
       of it.  The names of the mini-cookbooks can be determined
       the same way as the names of the object files, and this
       allows the cookbook fragments such as the following to be
       written:
            object_files = [fromto %.c %.o [source_files]];
            dependency_files = [fromto %.c %.c.d [source_files]];

            #include-cooked [dependency_files]

       The #include-cooked directive says to include the named
       files (there may be more than one) if the file exist.  Once
       the cookbook (and its includes) have been read in, the files
       included with this directive are checked to see if they are
       up-to-date.  If they are not, then they are re-cooked, and
       then Cook starts over again; this time with up-to-date
       include dependencies.

       The advantage of the method is that if the source files
       don't change, the dependency information is not
       recalculated, this can result in significant savings.  Also,


       Peter Miller                                         Page 19





       Cook                                              User Guide



       no processes are invoked if nothing has changed, Cook reads
       the information directly.  Because file opens are
       significantly cheaper than process invocations, this results
       in a significant performance improvement.

       The disadvantage of this method is that it is harder to
       describe and harder to implement.  To the uninitiated the
       cookbook looks incomplete and overly complex.

       Another problem is that if you delete an include file, Cook
       will complain that it is unable to derive the dependency
       file because the include file is not present.  Simply delete
       the dependency file and start again.  To avoid the problem,
       remove references to include files, and re-build, before
       deleting the include files.  This problem is seen from time
       to time, but does not present a huge problem in normal
       practice.

       [4m5.5[24m  [4mThe[24m [4mCascade[24m [4mMethod[0m

       When large numbers of files are involved, it becomes clear
       that the more popular include files are being scanned
       repeatedly.  This can be un-necessarily time-consuming when
       a popular include file is touched, as the dependency files
       of all .c files which reference it, even indirectly, must be
       re-calculated.

       There is also a problem when you are attempting to perform
       heterogenous builds for multiple architectures out of the
       same sources.  This is typically done by inserting the
       architecture name into the object file path as a directory.
       This presents another problem: nominating all of the
       architectures on the left-hand-side of the regenerated
       dependency recipes.  Especially if you add another one after
       the fact - now all the existing dependency files must be
       recalculated, merely to add the new architecture.

       An alternative is to scan each of the source files and
       include files once, and request cook to combine them
       together at build time, rather than at dependence scan time.
       This is done using cascade-for recipes.  These recipes
       nominate additional ingredients (on their right-hand-size)
       if any of the files on their left-hand-size appears in an
       ingredients list.
            cascade-for foo.c = bar.h;
       This recipe says that any recipe which has [4mfoo.c[24m for an
       ingredient, also has [4mbar.h[24m for an ingredient.

       This takes care of the heterogeneous case, because while the
       recipes remain specified in a simple manner, [4mviz:[0m
            %1/%0%.o: %0%.c
            {
                    %1-gcc -o [target] -c %0%.c;
            }


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       Any and all of them which compile [4mfoo.c[24m will depend on [4mbar.h[0m
       from the cascade-for recipe.  (This example assumes that you
       are using [4mgcc[24m(1) in the usual way, and that your
       architecture names match the GNU target names.)

       The dependency files are generated and maintained in much
       the same way as before, except that you need two: one for .c
       files and one for .h files:
            %0%.c.d: %0%.c
                    set no-cascade
            {
                    c_incl --no-cache --no-recurs %0%.c
                            "--prefix='cascade-for %0%.c ='"
                            "--suffix=';'"
                            -o [target];
            }
            %0%.h.d: %0%.h
                    set no-cascade
            {
                    c_incl --no-cache --no-recurs %0%.h
                            "--prefix='cascade-for %0%.h ='"
                            "--suffix=';'"
                            -o [target];
            }
       You will also need to add the .h.d files to the #include-
       cooked lines, to ensure they are generated.  If there are
       any generated .c or .h files, you will need to mention
       these, too.

       [4m5.6[24m  [4mDependencies[24m [4mon[24m [4mDerived[24m [4mFiles[0m

       If the relationship between a target and a derived
       ingredient appears only in a derived cookbook, it is likely
       that a clean build (solely from primary source files) will
       fail.  It is recommended that relationships such as this be
       placed in a primary source cookbook.  Cook looks for such
       dependencies, and will warn you about them.

       An example of this is commonly seen when using the -d option
       with [4myacc[24m(1).  If you have a separate lexical analyzer (the
       usual reason for using -d) it will need to include the
       generated token definition file.

       When you first add the [4myacc[24m(1) grammar definition, Cook will
       generate both the .c and .h file from the usual yacc
       recipes.  It is only later, when you have cleaned out all
       derived files (including the dependency files) that you may
       have problems.  Where is it recorded that Cook needs to
       regenerate the token definition file before it can determine
       the include dependencies of the lexical analyzer?  (They
       were in a .d file which was ``cleaned'' away.)

       Cook will detect this situation at the first possible
       moment, and warn you.  But placing the dependency in a non-


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       Cook                                              User Guide



       derived cookbook ([4me.g.[24m  Howto.cook) the warning will go
       away, and you will be able to do reliable clean builds.

       If you are convinced that Cook is [4malways[24m wrong in your case,
       it is possible to suppress this warning.  Place the line
            set no-include-cooked-warning;
       in your main cookbook, and the warning will not be issued.

       Suppressing the warning could lead to problems.  It is often
       better to add the ingredients recipe given in the warning to
       the cookbook, even if you think it is redundant.  This
       disables a single instance of the warning, rather than all
       of them - subsequent [4mvalid[24m instances will still be reported.
       (Implicit ingredients recipes, rather than explicit ones,
       are a useful alternative if you have a consistent pattern.)

       [4m5.7[24m  [4mRenaming[24m [4mInclude[24m [4mFiles[0m

       A consistent problem when you have automatically generated
       include dependencies is that when you move an include file,
       Cook complains that a required ingredient does not exist.

       The easiest way to avoid this is to do a few things before
       you build again after moving the include file.

          o Move the include file to the new name.

          o Where the include file was [4mfrom[24m, put a file containing
            the line
                 #error "I'm not here"
            to make Cook happy (the ingredient will exist), but
            also have the compiler generate an error if you miss a
            reference to it.

          o Edit all the references to the old include file name to
            reference the new name.  Don't worry if you miss one or
            two, the previous step will catch it.

          o Rebuild the program.  Cook will automatically re-
            calculate all of the include dependences and then
            recompile.

          o If you missed one of the include file references, Cook
            will not complain, but the compiler will.  (This
            assumes you are using whole-project builds, as
            described in the [4mLarge[24m [4mProjects[24m chapter.)

          o Once the program builds cleanly, remove the fake old
            include file, because you know for certain that there
            are no longer any references.






       Peter Miller                                         Page 22





       Cook                                              User Guide



       [4m6.[24m  [4mBuilding[24m [4mLarge[24m [4mProjects[0m

       This chapter covers some of the  issues you may come across
       in building large projects.  It gives a skeleton for how you
       could use Cook to build a medium-to-large projects, and even
       covers some heterogenous build issues.  It is expected that
       you will use this chapter as a guide; your development
       environment, and the shape of each individual project, mean
       that you will probably change this to suit your own needs.

       The material in this chapter uses many, many features of
       Cook.  If you are not familiar with Cook, you may want to
       read the rest of this User Guide to get a good idea of
       Cook's features and capabilities.  Even if you are familiar
       with Cook, you may need to refer to the language guide and
       built-in function descriptions from time to time.

       [4m6.1[24m  [4mWhole[24m [4mProject[24m [4mBuild[0m

       The skeleton given here builds the whole project as a single
       Cook invocation, even when the project consists of tens
       thousands of individual source files.  This is distinct from
       a build process which has Cook recursively invoking itself
       in deeper directories, or a shell script doing much the
       same.  Some of the advantages of doing whole project builds
       will be discussed in a later section.  For now it is
       sufficient to say that experience has shown repeatedly that
       this method does scale to significant projects.

       The first thing about a single build pass is that it happens
       relative to a single fixed place.  The logical place is the
       top of the project source tree3.  This works well with the
       [4msearch_list[24m functionality, mentioned below, which simplifies
       the structure of private work areas.

       [4m6.1.1[24m  [4mProject[24m [4mDirectory[24m [4mStructure[0m
       In the examples use in this chapter, the following directory
       structure is assumed:













       ____________________

       3. If   you   ever  want  to  use  Aegis  for  configuration
          management, this is what Aegis expects.

       Peter Miller                                         Page 23





       Cook                                              User Guide



                       ++-
                       -----[4mP[24m-[4mr[24m-[4mo[24m+[4mj[24m+[4me[24m-[4mc[24m-[4mt[24m--
                              +++--Hl-oiwbtroa.rcyook
                              +------++---[4ms[24m-[4mource1[24m.c
                              |      ++---[4ms[24m-[4mource2[24m.c
                              |      ++---[4me[24m-[4mtc...[0m
                              +++--i-nc-l+u-d-e--
                              |  ----++---[4ma[24m-[4mpi1[24m.h
                              |      ++---[4ma[24m-[4mpi2[24m.h
                              |      ++---[4me[24m-[4mtc...[0m
                              +++--[4mp[24m-[4mr[24m-[4mo[24m+[4mg[24m+[4mr[24m-[4ma[24m-[4mm[24m-[4m1[24m-
                              |      ++---[4ms[24m-[4mource3[24m.c
                              |      ++---[4ms[24m-[4mource4[24m.c
                              +++    -+---[4me[24m-[4mtc...[0m
                              +----[4mp[24m-[4mr[24m-[4mo[24m+[4mg[24m+[4mr[24m-[4ma[24m-[4mm[24m-[4m2[24m-
                                     ++---[4ms[24m-[4mource5[24m.c
                                     ++---[4mse[24m-[4motucr.c.e.6[24m.c
                                     -+----

       Below the project directory is a library directory, which
       contains functions common to all of the programs.  All
       source files in this directory are to be compiled, and
       linked into a library.  When the programs are linked, they
       will all reference this library.

       Next to the library directory is the include directory.
       This describes interfaces and data shared by the project.
       Information which is private to the internals of the library
       or a programs belongs there, not in the shared include
       space.

       The rest of the directories below the project directory are
       programs to be built.  The sources files in each are to be
       compiled and linked, together with the common library, to
       form the programs.  The name of the program will be taken
       from the directory.

       This is a common enough picture, repeated for many projects.
       Your individual projects may vary in the details; you may
       have more directory levels below the library directory, or
       all of your programs may be below a single command
       directory.  With simple changes to the examples given in
       this chapter, you will be able to cope with just about any
       project structure.

       [4m6.1.2[24m  [4mFile[24m [4mManifest[0m
       There are many ways of discovering the source files you are
       working with.  Many configuration management systems are
       able to give you a list of them.  For example, if you were
       using Aegis, you would say
            change_files =
                    [collect aegis -l cf -terse -p [project] -c [change]];
            project_files =
                    [collect aegis -l pf -terse -p [project] -c [change]];


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            manifest =
                    [sort [change_files] [project_files]];

       If you were using RCS, you could find all of the RCS files,
       and reconstruct the original filenames from them, [4mviz:[0m
            manifest =
                    [fromto ./%0RCS/%,v %0%
                            [collect find .  -path "*/RCS/*,v" -print]
                    ];

       Or you could simply scan the directory tree:
            manifest =
                    [fromto ./%0% %0%
                            [collect find .  ! -type d -print]
                    ];
       This is will find too much, but what follows will not be
       altered by this.  If you want to get more advanced, however,
       it helps to have an accurate primary source file manifest.

       [4m6.1.3[24m  [4mCompiling[24m [4mC[24m [4mSources[0m
       Recalling that the build will take place from the top of the
       source tree, this means that there it is going to have to be
       directory components in the filenames in the command
       executed by Cook, and in the recipes Cook is to use.

       This chapter uses C examples, but the same techniques work
       just as will with Fortran or Groff, or anything else.  Most
       of it maps directly; you may need to adjust for your
       specific compiler behavior.

       This chapter starts with the lowest level of building a
       project, the individual source files, and works its way
       upwards, building on the examples until the whole project,
       including the library and all programs are linked in a
       single pass.

       So, when cooking C sources, you need recipes of the form
            cc = gcc;
            cc_flags = -g -Wall -O;

            %0%.o: %0%.c
            {
                    [cc] [cc_flags] -c %0%.c
                            -o [target];
            }
       The ``%0'' part of the patterns matches zero or more
       directory parts.  If your compiler insists on putting the
       output (.o) file into the current directory (the top level
       one) you will need to move it, after:
            %0%.o: %0%.c
            {
                    [cc] [cc_flags] -c %0%.c;
                    mv %.o [target];
            }


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       But, most existing sources will be assuming that most of
       their include files are in the same directory as the source
       files.  We need include options to indicate this.  This is
       most easily done by using more pattern elements
            %1/%0%.o: %1/%0%.c
            {
                    [cc] [cc_flags] -I%1 -c %0%.c
                            -o [target];
            }
       Or by using the dirname of the source file
            %0%.o: %0%.c
            {
                    [cc] [cc_flags] -I[dirname %0%.c] -c %0%.c
                            -o [target];
            }
       For structures more than 2 directories deep, these two
       produce different options.  Depending on your project
       structure, if you have deep directories, one will probably
       be more suitable than the other.  One elegant use for deeper
       directory structures is to reflect the C++ inheritance
       hierarchy directly in the directory hierarchy.

       The simple [cc_flags] variable is often not sufficient.
       Instead, you may want to replace it with [variable_by_path
       "cc_flags" %0%.c] which will look for several variables (all
       prefixed with "cc_flags") based on the name of the source
       file.  See the [4mFunctions[24m [4mLibrary[24m chapter for a description
       of this function.

       The common include file will also need to be searched.
       Because of where the command is issued, it is rather simple
       to add the include directory, [4mviz:[0m
            %0%.o: %0%.c
            {
                    [cc] [cc_flags]
                            -I[dirname %0%.c] -Iinclude
                            -c %0%.c -o [target];
            }
       It is important to note that all of these recipes, and the
       commands they execute, are independent of the location of
       the source file.  It is possible to customize the cc-flags
       used, based on the target file, or even the directory
       containing the file, without compromising the generality of
       the recipe4.

       [4m6.1.4[24m  [4mTracking[24m [4mInclude[24m [4mDependencies[0m
       When it comes to tracking include dependencies using [4mc_incl[24m,
       you need to remember, again, that the Cook happens from a
       single place.  All of the recipes that [4mc_incl[24m writes for you
       must be [4mrelative[24m [4mto[24m [4mthat[24m [4mplace[24m.


       ____________________

       4. Hint: use a function, and pass [target] as the argument.

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       Continuing our example, and assuming we are using the
       cascade include method described in the previous chapter, we
       need include dependency files which look similar to
            cascade [4mprogram1[24m/[4msource3[24m.c =
            include/[4mapi1[24m.h
            ;
       Working backwards, we need to create the dependency file
       using the following recipe:
            %0%.c.d: %0%.c
                    set nocascade
            {
                    c_incl -nc -ns -nrec
                            -I[dirname %0%.c] -Iinclude
                            %0%.c
                            -prefix "'cascade %0%.c ='"
                            -suffix "';'"
                            -o [target];
            }
       For other source languages, you will need to use the [4mc_incl[0m
       [4m--language[24m option.

       The dependency files need to be included in the magic way so
       that Cook will build them again if they are out of date.
       This method needs the source file manifest to know their
       names.
            dep-files =
                    [addsuffix .d
                            [match_mask %0%.c [manifest] ]
                            [match_mask %0%.h [manifest] ]
                    ];
            #include-cooked [dep-files]
       These files will only be re-calculated if they are out of
       date; they are small and often zero-length, and so are
       usually very quick to read, adding little to the time it
       takes to read the cookbook.

       Notice that adding a new source file will automatically
       cause it to be scanned for include dependencies, without
       modification to the cookbook.

       [4m6.1.5[24m  [4mLinking[24m [4mLibraries[0m
       To link libraries with a generic recipe, you need a
       generalized way of specifying their contents.  A little
       trickery with constructed variable names does the job:
            %/lib%.a: [[target]_obj]
                    set unlink
            {
                    ar cq [target] [[target]_obj];
            }
       The right-hand-side of recipes has late binding, and we use
       the name of the target to tell us the name of the variable
       which holds all of the object files.  Assigning this
       variable looks bizarre, but it looks more logical as you
       have more and more of them...


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            library/liblibrary.a_obj =
                    [fromto %0%.c %0%.o
                            [match_mask "library/%0%.c" [manifest] ]
                    ];
       The great thing about this construct is that you can build a
       loop, using Cook's loop statement, that assigns a variable
       for each of your libraries, if you have more than one.

       Notice that adding a new library source file will
       automatically cause it to be compiled into the library,
       without modification to the cookbook.

       [4m6.1.6[24m  [4mLinking[24m [4mCommands[0m
       We'll use a similar trick for each of the programs you want
       to link...  First the link line
            bin/%: [[target]_obj]
                    set mkdir
            {
                    [cc] -o [target] [[target]_obj];
            }
       Then the objects variable.  Note how we add a library
       [4mfilename[24m here, this will still only use the library portions
       actually referenced, not the whole library, so it won't
       bloat your programs.
            bin/[4mprogram[24m_obj =
                    [fromto %0%.c %0%.o
                            [match_mask [4mprogram[24m/%0%.c [manifest] ]
                    ]
                    library/liblibrary.a
                    ;

       Notice that adding a new program source file will
       automatically cause it to be compiled and linked into the
       program, without modification to the cookbook.

       The loop construct tends to obscure things, which is why the
       essential assignment was given first.  This next fragment
       shows the whole loop.
            programs =
                    [fromto %/main.c %
                            [match_mask %/main.c [manifest] ]
                    ];
            program_list = [programs];
            loop
            {
                    program = [head [program_list]];
                    if [not [count [program]]] then
                            loopstop;
                    program_list = [tail [program_list]];

                    bin/[program]_obj =
                            [fromto %0%.c %0%.o
                                    [match_mask [program]/%0%.c
                                            [manifest]


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                                    ]
                            ]
                            library/liblibrary.a
                            ;
            }
       And now tell Cook you actually want it to do something, like
       build all of the programs...
            all: [addprefix bin/ [programs]];

       Notice they way the commands variable is constructed: just
       adding a new command (and its main.c file) will
       automatically cause it to be built, without modification to
       the cookbook.


       [4m6.2[24m  [4mPrivate[24m [4mWork[24m [4mAreas[0m

       This chapter is about large projects, but large projects
       usually means large numbers of developers.  The directory
       structure and cookbook presented so far does not immediately
       lend itself to use by multiple developers.

       [4m6.2.1[24m  [4mDirectory[24m [4mStructure[0m
       The method suggested here uses Cook's [4msearch_list[0m
       functionality, which nominates a search list of directories
       that Cook looks in to find the files named in the recipes.
       This can be used to overlay a private work area on top of a
       master repository.
       [47m[40m                ++[0m----------[40m+[0m
                      [40m++[0m|[4mReposito[24m[40m+[4m[0m[4mr[24m[40m+[4m[0m[4my[24m|
                     [40m+  [0m|  main.[40m+[0mc[40m+ [0m|      [4m[47mC[24m+[4mo[24m-[4mm[24m-[4mb[24m-[4mi[24m-[4mn[24m-[4me[24m-[4md[24m--[4mV[24m-[4mi[24m-[4me[24m+[4mw[0m
                   [40m++   [0m| part1[40m+[0m.c  |      [40m+[47m+ main.c   |[0m
                   [47m+-[4mW[24m-[4mo[24m-[4mr[24m-[4mk[24m[0m+[47m-[4mA[24m-[4mr[24m-[4me[24m-[4ma[24m-+[0m----[40m+      +[47m+ part1.c  |[0m
                   [47m|  main.c  |   [40m++       [47m| part2.c  |[0m
                   [47m|          | [40m++         [47m+----------+[0m
                   [47m| part2.c  |[40m+[0m
                   [47m+----------+[0m

       [40mWhen recipes are run, the results are written into the work[0m
       [40marea, which means that the repository can be completely[0m
       [40mread-only.[0m

       [40mIt follows from this, that the directory structure of the[0m
       [40mwork area exactly parallels the directory structure of the[0m
       [40mrepository.  [4mExcept[24m you only check out files into your work[0m
       [40marea that you actually need to change.[0m

       [4m[40m6.2.2[24m  [4mFinding[24m [4mthe[24m [4mCookbook[0m
       [40mSetting the search list is done with a simple assignment.[0m
       [40mIn your work area, create a simple Howto.cook file,[0m
       [40mcontaining only 3 lines:[0m
            [40mset mkdir;[0m
            [40msearch_list = . /project/repository ;[0m
            [40m#include /project/repository/Howto.cook[0m

       
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       [40mYou only use this file if you don't need to modify the[0m
       [40mcookbook itself.  You can make it work always, even if you[0m
       [40mare modifying the cookbook, by giving the cookbook a[0m
       [40mdifferent name (main.cook), and changing Howto.cook to[0m
       [40malways read[0m
            [40mset mkdir;[0m
            [40msearch_list = . /project/repository ;[0m
            [40m#include [resolve main.cook][0m
       [40mThe [resolve] function walks the search list, looking for[0m
       [40mthe file5.  This gives you access to Cook's internal search[0m
       [40mmechanism.  However, we also need to modify each of the[0m
       [40mrecipes to take the search list into account.[0m

       [40mThe unexplained mkdir flag is used to request that[0m
       [40mdirectories be automatically created before recipe bodies[0m
       [40mare run.  This is common for large projects, where the[0m
       [40msource files are structured into several sub-directories,[0m
       [40mrather than all lumped together in the one place.  This may[0m
       [40mbe necessary, for example, if a .c file in the repository[0m
       [40mneeds to be recompiled because a .h file in the work area[0m
       [40mhas been changed.[0m

       [4m[40m6.2.3[24m  [4mFile[24m [4mManifest[0m
       [40mThe files could be in either of two places.  You need to[0m
       [40mmerge them.  Most configuration management tools do this for[0m
       [40myou; in this example we'll scan the directory trees again.[0m
       [40mFortunately, Cook comes with a tool to do this efficiently.[0m
            [40mall_files_in_. = ;[0m
            [40m#include manifest.cook[0m
            [40mmanifest = [all_files_in_.];[0m

            [40m/* This reduces re-scanning to a minimum. */[0m
            [40mset fingerprint;[0m

            [40m%0manifest.cook: ["if" [in "%0" ""] "then" "." "else" "%0"][0m
                    [40mset mkdir[0m
            [40m{[0m
                    [40mcook_bom /* Bill Of Materials */[0m
                            [40m[addprefix '--dir=' [search_list]][0m
                            [40m[need] [target] ;[0m
            [40m}[0m
       [40mAt the end of this fragment, the manifest variable contains[0m
       [40ma complete list of all files in the directory tree(s).  This[0m
       [40mvariable may then be taken apart with the match_mask[0m
       [40mfunction to build ingredients lists.[0m

       [40mThe if function is different to the [4mif[24m statement.  It allows[0m
       [40myou to select one of two values (the then part or the else[0m
       [40mpart) without creating a dummy variable.  In this example,[0m
       [40mit would be impossible to create a dummy variable.  Remember[0m

       ____________________

       5. The  search  list  defaults  to  just  dot  (the  current
          directory) if not set.

       Peter Miller                                         Page 30





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       [40mto quote the if, then and else strings, otherwise Cook will[0m
       [40mthink they are [4mif[24m, [4mthen[24m and [4melse[24m keywords, and give you a[0m
       [40msyntax error.[0m

       [40mThe constructed [4mmanifest.cook[24m files work for both the top-[0m
       [40mlevel directory and individual sub-directories.[0m

       [4m[40m6.2.4[24m  [4mCompiling[24m [4mC[24m [4mSources[0m
       [40mThe C compilation recipe needs to be changed to read...[0m
            [40m%0%.o: %0%.c[0m
            [40m{[0m
                    [40m[cc] [cc_flags][0m
                            [40m[prepost "-I" /[dirname %0%.c] [search_list]][0m
                            [40m[prepost "-I" "/include" [search_list]][0m
                            [40m-c [resolve %0%.c][0m
                            [40m-o [target];[0m
            [40m}[0m
       [40mThis ensures that the rights places are searched for include[0m
       [40mfiles.[0m

       [40mThe prepost function is used to add a prefix and a suffix to[0m
       [40meach of the remaining strings.  This is very useful when[0m
       [40mconstructing filenames, as are the addprefix and addsuffix[0m
       [40mfunctions.[0m

       [4m[40m6.2.5[24m  [4mTracking[24m [4mInclude[24m [4mDependencies[0m
       [40mA similar change needs to be made to the include[0m
       [40mdependencies recipe...[0m
            [40m%0%.c.d: %0%.c[0m
                    [40mset nocascade[0m
            [40m{[0m
                    [40mc_incl -nc -ns -nrec[0m
                            [40m[prepost "-I" /[dirname %0%.c] [search_list]][0m
                            [40m[prepost "-I" "/include" [search_list]][0m
                            [40m[resolve %0%.c][0m
                            [40m-prefix "'cascade %0%.c ='"[0m
                            [40m-suffix "';'"[0m
                            [40m[addsuffix "-rp=" [search_list]][0m
                            [40m-o [target];[0m
            [40m}[0m
       [40mNote that the form of the output of this recipe [4mdoes[24m [4mnot[0m
       [40mchange.  This means that the recipes it writes work even if[0m
       [40myou subsequently copy a file from the repository to the work[0m
       [40marea, or uncopy one.[0m

       [4m[40m6.2.6[24m  [4mLinking[24m [4mLibraries[0m
       [40mThe library recipe needs few modifications.[0m
            [40m%/lib%.a: [[target]_obj][0m
                    [40mset unlink[0m
            [40m{[0m
                    [40mar cq [target] [resolve [[target]_obj]];[0m
            [40m}[0m
       [40mThe variable assignment given above requires no[0m
       [40mmodifications.[0m

       
       Peter Miller                                         Page 31





       Cook                                              User Guide



       [40m[4m6.2.7[24m  [4mLinking[24m [4mCommands[0m
       [40mThe command linking recipe requires few modifications.[0m
            [40mbin/%: [[target]_obj][0m
                    [40mset mkdir[0m
            [40m{[0m
                    [40m[cc] -o [target] [resolve [[target]_obj]];[0m
            [40m}[0m
       [40mThe variable assignment needs no modifications.[0m

       [4m[40m6.3[24m  [4mWhole[24m [4mProject[24m [4mBuild[24m [4mAdvantages[0m

       [40mThe advantage of using a whole project build is that the[0m
       [40mdependency graph is complete, and the order of traversal may[0m
       [40mbe freely determined by Cook.  Breaking the build into[0m
       [40mfractured segments denies Cook access to the whole graph,[0m
       [40mand dictates the order of traversal to one which, in the[0m
       [40mlight of the entire graph, would be incorrect.[0m

       [40mIt greatly simplifies the creating of work areas for[0m
       [40mdevelopers, by using Cook's [4msearch_list[24m functionality.[0m

       [40mA whole project build also permits the [4mcook[24m [4m-continue[24m option[0m
       [40mto work in the presence of a wider range of errors.[0m

       [40mThe whole project build also permits the [4mcook[24m [4m-parallel[0m
       [40moption to parallelize more operations.[0m

       [4m[40m6.4[24m  [4mHeterogenous[24m [4mBuild[0m

       [40mLarge projects frequently involve numerous target[0m
       [40marchitectures.  This may be in the form a multiple native[0m
       [40mcompilations, performed in suitable hosts, or it may take[0m
       [40mthe form of cross-compilation.[0m

       [40mIn this example, we assume that the GNU C Compiler (GCC) is[0m
       [40mbeing used.  When GCC is installed as a cross compiler, the[0m
       [40mcommand names (cc, as, ld, [4metc[24m) are installed with the[0m
       [40marchitecture name as a prefix.  For consistency, the native[0m
       [40mcompiler is installed with its own architecture names as a[0m
       [40mprefix, in addition to the more commonly used gcc command.[0m
       [40mThis example will exploit this normal installation practice.[0m

       [4m[40m6.4.1[24m  [4mCross[24m [4mCompiling[24m [4mC[24m [4mSources[0m
       [40mIn order to support cross compiling, the C compilation[0m
       [40mrecipe needs to be changed to read...[0m
            [40m%1/%0%.o: %0%.c[0m
                    [40mhost-binding [defined-or-null %1-hosts][0m
            [40m{[0m
                    [40m%1-gcc [cc_flags][0m
                            [40m[prepost "-I" /[dirname %0%.c] [search_list]][0m
                            [40m[prepost "-I" "/include" [search_list]][0m
                            [40m-c [resolve %0%.c][0m
                            [40m-o [target];[0m
            [40m}[0m

       
       Peter Miller                                         Page 32





       Cook                                              User Guide



       [40mThis uses the first directory element of the [4mtarget[24m to be[0m
       [40mthe architecture name.  This allows multiple architectures[0m
       [40mto be compiled in the same source tree, simultaneously.[0m

       [40mBecause of the practice of installing a duplicate GCC in the[0m
       [40msame form as the cross compilers, this same recipe continues[0m
       [40mto work for native builds.[0m

       [40mThe [4mhost-binding[24m line tells Cook to run the command on one[0m
       [40mof the hosts nominated in a variable named for the[0m
       [40marchitecture (or as a native cross-compiler of no such[0m
       [40mvariable exists).  (The defined-or-null function is[0m
       [40mavailable in the ``functions'' library distributed with[0m
       [40mCook.)[0m

       [40mRemembering these architectures follow the GNU convention,[0m
       [40mthese lines could read[0m
            [40mi386-linux-hosts = fast faster fastest ;[0m
       [40mThis will do two things for you: first, it will always[0m
       [40mexecute linux compiles on linux hosts even when Cook is not[0m
       [40mexecuted on one; second, it will use more than one of them[0m
       [40mwhen you use the --parallel option.[0m

       [40mIt is possible to use implicit ingredients recipes to say[0m
       [40mthat all object of a given architecture depend on a magic[0m
       [40minclude file, [4me.g.[0m
            [40mi386-linux/%0%.o: include/linux-special.h;[0m
       [40mcould be used to say that all Linux object files depend on[0m
       [40mthis include file.  (This is a sledge-hammer approach, and a[0m
       [40mmore subtle method is preferable, but it is sometimes[0m
       [40mrequired.)[0m

       [4m[40m6.4.2[24m  [4mTracking[24m [4mInclude[24m [4mDependencies[0m
       [40mBecause of the cascade form of include dependency, there is[0m
       [40mno need to do anything different for include dependencies,[0m
       [40meven if you add another architecture some time in the[0m
       [40mfuture.[0m

       [4m[40m6.4.3[24m  [4mLinking[24m [4mLibraries[0m
       [40mThe library recipe needs few modifications.[0m
            [40m%1/%/lib%.a: [%/lib%.a_obj][0m
                    [40mset unlink[0m
            [40m{[0m
                    [40m%1-ar cq [target] [resolve [%/lib%.a_obj]];[0m
            [40m}[0m
       [40mThe variable assignment given above requires no[0m
       [40mmodifications.[0m

       [4m[40m6.4.4[24m  [4mLinking[24m [4mCommands[0m
       [40mThe command linking recipe requires few modifications.[0m
            [40m%1/bin/%: [bin/%_obj][0m
                    [40mset mkdir[0m
            [40m{[0m
                    [40m%1-gcc -o [target] [resolve [bin/%_obj]];[0m

       
       Peter Miller                                         Page 33





       Cook                                              User Guide



       [40m     }[0m
       [40mThe variable assignment needs no modifications.[0m

       [4m[40m6.4.5[24m  [4mWhat[24m [4mto[24m [4mBuild[0m
       [40mThe list of what to build becomes more interesting.  You can[0m
       [40mnominate any and all architectures for which you have cross[0m
       [40mcompilers, or native compilers and native hosts.[0m
            [40mall:[0m
                    [40m[addprefix i386-linux/bin/ [commands]][0m
                    [40m[addprefix sparc-linux/bin/ [commands]][0m
                    [40m[addprefix sparc-solaris2.0/bin/ [commands]][0m
                    [40m[addprefix m68k-sunos4.1.3/bin/ [commands]][0m
                    [40m;[0m

       [40mAll of these architectures will be built in a single Cook[0m
       [40minvocation, on appropriate machines if necessary.  The use[0m
       [40mof --continue and --parallel work over the entire scope of[0m
       [40mthe build.[0m

       [4m[40m6.5[24m  [4mInstalling[24m [4mThings[0m

       [40mThe biggest hassle is that the [4minstall[24m(1) command, which[0m
       [40mshould know how to do most installation tasks, has[0m
       [40mcompletely incompatible interfaces on the various platforms.[0m
       [40mThis is why the GNU autoconf system comes with an [4minstall-sh[0m
       [40mscript, which faithfully emulates the BSD options.  Once you[0m
       [40mhave a reliable command line interface to an [4minstall[24m(1)[0m
       [40mprogram (be it perl or shell) you can then write sensible[0m
       [40minstallation cookbooks.[0m

       [40mIf we have a list of commands, we would install as follows:[0m
            [40mprefix = /usr/local;[0m
            [40mbindir = [prefix]/bin;[0m
            [40minstall = install;[0m

            [40minstall: [addprefix [bindir]/ [commands]];[0m
            [40m[bindir]/%0%: bin/%0% bin/%0.mkdir[0m
            [40m{[0m
                    [40m[install] -m 755 bin/%0% [bindir]/%0%;[0m
            [40m}[0m
       [40mThat magic bin/%0.mkdir file is used to record that the[0m
       [40mdestination directory exists.  While you can often assume[0m
       [40mthis, it is not always true when you are building things[0m
       [40mlike RPM packages.[0m
            [40mbin/%0.mkdir:[0m
            [40m{[0m
                    [40m[install] -d [bindir]/%0[0m
                            [40mset errok;[0m
                    [40mtouch [target];[0m
            [40m}[0m
       [40mThe alternative is to use[0m
            [40mset mkdir;[0m
       [40mat the top of your cookbook.  This creates directories for[0m
       [40mtargets before rules are run.  The install recipe then reads[0m

       
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       [40m     set mkdir;[0m

            [40m[bindir]/%0%: bin/%0%[0m
            [40m{[0m
                    [40m[install] -m 755 bin/%0% [bindir]/%0%;[0m
            [40m}[0m
       [40mbecause there is no need for the ``.mkdir'' recipe.  This,[0m
       [40mhowever gives you less crontrol over the directories[0m
       [40mpermission modes, and it doesn't help when you want to[0m
       [40mcreate empty directories as part of the install.  Use the[0m
       [40mappropriate technique for your needs.[0m

       [4m[40m6.6[24m  [4mMiscellaneous[0m

       [40mThis section contains assorted material that covers a[0m
       [40mvariety of topics.  (As the manual expands, it will probably[0m
       [40mbe moved somewhere else.)[0m

       [4m[40m6.6.1[24m  [4mLots[24m [4mof[24m [4mDependencies[0m
       [40mThere are cases where you may want to nominate a whole[0m
       [40mcategory of files as depending on something else.  For[0m
       [40mexample, you may want to say that all your fubar-language[0m
       [40msources depend on your fubar compiler You could say[0m
       [40msomething such as[0m
            [40mcascade [match_mask %0%.fubar [manifest]] = fubarcompiler;[0m
       [40mbut recall that [4meverything[24m which has a .fubar file as an[0m
       [40mingredient will also have fubarcomplier as an ingredient.[0m
       [40mThis may not be what you wanted.[0m

       [40mRecall, also, that compiler recipes carry specific[0m
       [40minformation.  You could more specifically nominate the[0m
       [40mcompiler by saying[0m
            [40m%0%.o: %0%.fubar: fubarcompiler[0m
            [40m{[0m
                    [40mfubarcompiler -c %0%.fubar -o [target];[0m
            [40m}[0m
       [40mwhich would be much more selective about which uses of[0m
       [40m.fubar files also depend on fubarcompiler.[0m

       [40mThere are times when writing cross-compilation recipes when[0m
       [40myou want to nominate an operating-system-specific include[0m
       [40mfile for all of the object files:[0m
            [40m%1/%0%.o: %0%.c[0m
            [40m{[0m
                    [40m/* general cross compiler recipe */[0m
                    [40m%1-gcc -c %0%.c -o [target];[0m
            [40m}[0m
            [40m/* All windows NT objects depend on this include file */[0m
            [40mi386-NT/%0%.o: winnt.h;[0m

       [40mYou can also use [4mgates[24m to make you recipes more selective.[0m
       [40mThe gating expression may be just about anything, but is[0m
       [40moften a pattern match or simple set membership.[0m
            [40m%.o: %.c[0m

       
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       Cook                                              User Guide



       [40m             if [in [target] foo.o bar.o][0m
            [40m{[0m
                    [40m/* foo.o and bar.o are magic */[0m
                    [40mcc -DMAGIC [cc_flags] -c %.c;[0m
            [40m}[0m
       [40mThe gate is most easily read as ``if [4m(this[24m [4mcondition)[24m use[0m
       [40mthis recipe''.[0m

       [4m[40m6.6.2[24m  [4mError[24m [4mProcessing[0m
       [40mCook stops processing a recipe at the first error.  If the[0m
       [40merror occurs when constructing a command to be executed, the[0m
       [40mcommand is [4mnot[24m executed.  If a recipe body contains more[0m
       [40mthan one command, and one of them gets an error (and doesn't[0m
       [40mhave the [4merrok[24m flag set) the rest of the command will [4mnot[24m be[0m
       [40mexecuted.[0m

       [40mIn addition, if an error occurs while executing a recipe[0m
       [40mbody, the targets of the recipe will be deleted (on the[0m
       [40massumption that they are probably only partially completed,[0m
       [40mor otherwise defective).  To override this behavior, use the[0m
       [4m[40mprecious[24m flag.[0m

       [4m[40m6.6.3[24m  [4mNFS[0m
       [40mA perennial problem for building projects over networks is[0m
       [40mthat the clocks don't match.  If you use the [4mtime-adjust[0m
       [40mflag, this problem is largely solved.  The simplest method[0m
       [40mis to put[0m
            [40mset time-adjust;[0m
       [40mat the top of your cookbook.[0m

       [40mFile fingerprints, while not directly relevant to NFS, can[0m
       [40moffer significant performance improvements, as they can[0m
       [40meliminate many cases of unnecessary re-compilation.  To turn[0m
       [40mthem on, use[0m
            [40mset fingerprint;[0m
       [40mat the top of your cookbook.  See below for more discussion[0m
       [40mof fingerprints.[0m

       [4m[40m6.6.4[24m  [4mSymbolic[24m [4mLinks[0m
       [40mSymbolic links are followed to the actual file, when[0m
       [40mdetermining file modification times.  The modification time[0m
       [40mof the symbolic link itself is not used.  This means that[0m
       [40m``symlink farms'' can be used when constructing work areas,[0m
       [40mparticularly when you want functionality more complex than[0m
       [40msearch_list can provide.[0m

       [4m[40m6.7[24m  [4mFile[24m [4mFingerprints[0m

       [40mCook has the ability to supplement the last-modified time-[0m
       [40mstamps the operating system supplies for each file with a[0m
       [40m``fingerprint''.  This is a cryptographically strong[0m
       [40mchecksum, with an mind-bogglingly low probability that two[0m
       [40mdifferent files will have the same fingerprint.[0m


       
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       [40mWhen Cook needs to know if a file has changed, it looks at[0m
       [40mthe last-modified time-stamp.  If it has changed since the[0m
       [40mlast time the fingerprint was calculated, the fingerprint is[0m
       [40mre-calculated.  If the fingerprints match, Cook knows the[0m
       [40mfile contents are unchanged, and uses the old time-stamp,[0m
       [40mand also suppress any recipe actions which would otherwise[0m
       [40mhappen if the file contents had actually changed.  (Cook[0m
       [40mremembers the both the new and old time-stamps, so that it[0m
       [40mcan be efficient about re-calculating checksums and still[0m
       [40muse the old time stamp for out-of-date calculations.)[0m

       [40mWhen recipe bodies are run, Cook knows that the target(s)[0m
       [40mhave been modified, so it doesn't need to re-examine the[0m
       [40moperating system's idea of the last-modified time-stamp, it[0m
       [40msimply re-fingerprints.[0m

       [40mIt is tempting to try to achieve something similar by[0m
       [40mwriting recipe bodies which only over-write their targets if[0m
       [40mthey actually changed.  [4mE.g.[0m
            [40m%.o: %.c[0m
            [40m{[0m
                    [40mif [exists [target]][0m
                    [40m{[0m
                            [40m[CC] -o %.tmp -c %.c;[0m
                            [40mif cmp %.tmp %.o\;[0m
                            [40mthen mv %.tmp %.o\;[0m
                            [40melse rm %.tmp;[0m
                    [40m}[0m
                    [40melse[0m
                            [40m[CC] -o %.o -c %.c;[0m
            [40m}[0m
       [40mHowever, this will not work (whether or not you have[0m
       [40mfingerprints turned on).  Largely as a defense against NFS[0m
       [40mtime synchronization problems and stupid systems with very[0m
       [40mcoarse file time-stamps, Cook ``knows'' that because the[0m
       [40mrecipe body was run the target ``changed'', causing all down[0m
       [40mstream dependencies to be considered out-of-date.[0m

       [40mIn addition, this recipe would leave the last-modified time-[0m
       [40mstamp out-of-date if the file was unchanged.  This means the[0m
       [40mrecipe would trigger again in the next Cook execution,[0m
       [40mnegating many of the intended savings.[0m

       [40mFingerprints are intended for this purpose, but have the[0m
       [40madvantage of leaving the last-modified time-stamps correct,[0m
       [40mand they need to do half the I/O that the [4mcmp[24m(1) command[0m
       [40mdoes.  Also, all down stream dependent files are touched, to[0m
       [40mensure their last-modified time-stamps are also consistent.[0m
       [40mNaturally, if they needed to be re-built for some other[0m
       [40mreason, then they would be re-built, not simply touched.[0m

       [40mWhile there is some overhead in initially calculating the[0m
       [40mfingerprints for a new work area, they repay that overhead[0m
       [40mmany times over.  This is especially true if your system has[0m

       
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       [40mgenerated code in it, particularly generated include files,[0m
       [40mbut there are also savings for simpler, smaller projects.[0m

       [4m[40m6.7.1[24m  [4mTurning[24m [4mFingerprints[24m [4mOn[0m
       [40mTo turn fingerprints on, you need to add the lines[0m
            [40mset fingerprint;[0m
            [40mset time-adjust;[0m
       [40mto your cookbook.  That second line is no essential, but it[0m
       [40mcorrects last-modified time-stamps when NFS time[0m
       [40msynchronization problems would otherwise cause inconsistent[0m
       [40mbehavior.[0m

       [40mWhile it is possible to turn fingerprints on for a subset of[0m
       [40mthe files in your project, it is not as straightforward as[0m
       [40mit may seem.  There is no way to bind the fingerprint[0m
       [40mrequest to a single file, only to recipes, so you need to[0m
       [40muse the ``set fingerprint'' recipe flag on all recipes[0m
       [40mbetween the relevant source file and the ultimate target.[0m
       [40mThis tends to be messy.[0m

       [4m[40m6.7.2[24m  [4mVanishing[24m [4mDependencies[0m
       [40mIt is quite common that you need to re-build a file if one[0m
       [40mof the dependencies is removed.  Usually, this is quite hard[0m
       [40mto detect, because Cook has trouble seeing something that[0m
       [40misn't there, compared to the previous execution.  However an[0m
       [40mingenious method has been described by Gilles Lamiral[0m
       [40m<lamiral@mail.dotcom.fr> which ``remembers'' though a file:[0m
            [40mfunction contents-remember =[0m
            [40m{[0m
                    [40m/* @1 = name of contents file */[0m
                    [40m/* @2..N = the value of [need] */[0m
                    [40m[write [args]];[0m
            [40m}[0m
            [40mfunction contents-changed =[0m
            [40m{[0m
                    [40m/* @1 = name of contents file *[0m
                    [40m/* @2..N = the value of [need] */[0m
                    [40mif [not [exists [resolve [@1]]]] then[0m
                            [40mreturn 0;[0m
                    [40mlocal old-contents = [collect_lines cat [resolve [@1]]];[0m
                    [40m/* return 0 if nothing disappeared, >0 if did disappear */[0m
                    [40mreturn [count [stringset [old-contents] - [tail [arg]]]];[0m
            [40m}[0m
            [40mlibfred.a libfred.contents: [fred_obj][0m
                    [40mset ["if" [contents-changed libfred.contents [fred_obj]][0m
                            [40m"then" force][0m
                        [40munlink[0m
            [40m{[0m
                    [40mar cq [target] [resolve [fred_obj]];[0m
                    [40m[contents-remember libfred.contents [fred_obj]];[0m
            [40m}[0m

       [40mNote: because the set clause is evaluated when the target is[0m
       [40mevaluated, the [need] variable is not available.  In this[0m

       
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       [40mexample, you must have calculated the final value of[0m
       [40m[fred_obj] before the recipe appears in the cookbook.  The[0m
       [40mevaluation of the set clause also limits the application of[0m
       [40mthis technique to explicit recipes; it will not work for[0m
       [40mimplicit (pattern) recipes, because the value of the pattern[0m
       [40melements is not known at the time the set clause is[0m
       [40mevaluated.[0m

       [4m[40m6.8[24m  [4mCoping[24m [4mwith[24m [4mLinks[0m

       [40mYou will notice that the deafult operation of Cook copes[0m
       [40mwith links (hard links and symbolic links) rather poorly.[0m
       [40mFor example, the recipe[0m
            [40mtwo: one[0m
            [40m{[0m
                    [40mln one two;[0m
            [40m}[0m
       [40mwill always conclude that file [4mtwo[24m is out-of-date.  This is[0m
       [40mbacause files [4mone[24m and [4mtwo[24m have exactly the same time stamp.[0m

       [40mIf you specify a weaker time constraint, Cook will allow[0m
       [40mthis kind of recipe to be written, and [4mnot[24m conclude the[0m
       [40mfiles is always out of date:[0m
            [40mtwo: one(weak)[0m
            [40m{[0m
                    [40mln one two;[0m
            [40m}[0m
       [40mThe ``(weak)'' on the end of the ingredient name tells Cook[0m
       [40mto use the weak edge type, rather than the strict edge type.[0m

       [40mThis technique is useful for symbolic links, too.[0m

       [40mOne other thing which can be very useful for both link[0m
       [40mtypes, but particularly symbolic links to directories, is[0m
       [40mthe ``set unlink'' recipe flag.[0m
            [40mtwo: one(weak)[0m
                    [40mset unlink[0m
            [40m{[0m
                    [40mln -s one two;[0m
            [40m}[0m
       [40mThis removes the target (if necessary) before the recipe[0m
       [40mbody is run.[0m

       [4m[40m6.9[24m  [4mCoping[24m [4mwith[24m [4mVersion[24m [4mStamps[0m

       [40mIn some systems, the version stamp is regenerated for every[0m
       [40mbuild, but you don't want to relink zillions of executables[0m
       [40mjust becaise the version stamp has changed, but nothing else[0m
       [40mhas.[0m

       [40mBy using the ``(exists)'' edge type, you can tell Cook that[0m
       [40man ingredient is needed for a given target, but that it[0m
       [40mshould never be considered to make the target out-of-date.[0m
       [40mFor example:[0m

       
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       [40m     #include "c"[0m
            [40mall: prog1 prog2;[0m
            [40mversion.c:[0m
                    [40mset force[0m
            [40m{[0m
                    [40mdate "'+#define VERSION \"%C\"'" > [target];[0m
            [40m}[0m
            [40mprog1: prog1.o mylib.a version.o(exists)[0m
            [40m{[0m
                    [40mgcc -o [target] [need];[0m
            [40m}[0m
            [40mprog2: prog2.o mylib.a version.o(exists)[0m
            [40m{[0m
                    [40mgcc -o [target] [need];[0m
            [40m}[0m
       [40mThis cookbook will generate a new [4mversion.c[24m file every time[0m
       [40mthat Cook is run, and thus a new [4mversion.o[24m file.  However,[0m
       [40mthe [4mprog1[24m and [4mprog2[24m files will not be re-linked unless[0m
       [40msomething else changed as well.[0m




































       
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       [40m[4m7.[24m  [4mCookbook[24m [4mLanguage[24m [4mDefinition[0m

       [40mThis chapter defines that language which cookbooks are[0m
       [40mwritten in.  While some of its properties are similar to C,[0m
       [40mdo not be misled.[0m

       [40mA number of sections appear within this chapter.[0m

         [40m1.  The [4mLexical[24m [4mAnalysis[24m section describes what the words[0m
             [40mof the cookbook language look like.[0m

         [40m2.  The [4mPreprocessor[24m section describes the include[0m
             [40mmechanism and the conditional compilation mechanism.[0m

         [40m3.  The [4mSyntax[24m [4mand[24m [4mSemantics[24m section describes how words[0m
             [40min the cookbook may be combined to form valid[0m
             [40mconstructs (the [4msyntax[24m), and what these constructs[0m
             [40mmean (the [4msemantics[24m).[0m

       [40mThe sections are laid out in the recommended reading order.[0m

       [4m[40m7.1[24m  [4mLexical[24m [4mAnalysis[0m

       [40mThe cookbook is made of a number of recipes, which are in[0m
       [40mturn made of words.  This section describes what constitutes[0m
       [40ma word, and what does not.[0m

       [4m[40m7.1.1[24m  [4mWords[24m [4mand[24m [4mKeywords[0m
       [40mWords are made of sequences of almost any character, and are[0m
       [40mseparated by white space (including end-of-line) or the[0m
       [40mspecial symbols.  [1mCook [22mis always case sensitive when reading[0m
       [40mcookbooks.[0m

       [40mThe characters [1m:;={}[] [22mare the special symbols, and are[0m
       [40mwords in themselves, needing no delimiting.[0m

       [40mIn addition to the special symbols, some words, known as[0m
       [4m[40mkeywords[24m, have special meaning to [1mcook[22m.  The keywords are:[0m

           [40melse        host-binding      loopstop      single-thread[0m
           [40mfail             if            return           then[0m
         [40mfunction          loop             set          unsetenv[0m
       [40mYou will meet the keywords in later sections.[0m

       [4m[40m7.1.2[24m  [4mEscape[24m [4mSequences[0m
       [40mThe character [1m\ [22mis the [4mescape[24m character.  If a character is[0m
       [40mpreceded by a [1m\ [22many specialness, if it had any, will be[0m
       [40mremoved.  If it had no specialness it may have some added.[0m

       [40mThis means that, if you want to use [1mif [22mas a word, rather[0m
       [40mthan a keyword, at least one of its characters needs to be[0m
       [40mescaped, for example [1m\if[22m.[0m

       [40mThe escape sequences which are special are as follows.[0m

       
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       [40m           [1m\b    [22mThe backspace character[0m
                  [1m[40m\f    [22mThe form feed character[0m
                  [1m[40m\n    [22mThe newline or linefeed character[0m
                  [1m[40m\r    [22mThe carriage return character[0m
                  [1m[40m\t    [22mThe horizontal tab character[0m
                 [1m[40m\[4m[22mnnn[24m   A character with a value of [4mnnn[24m,[0m
                        [40mwhere [4mnnn[24m is an octal number of[0m
                        [40mat most 3 digits.[0m
       [40mAn escaped end-of-line is totally ignored.  It should be[0m
       [40mnoted that a cookbook may not have any non-printing ASCII[0m
       [40mcharacters in it other than space, tab and end-of-line.[0m

       [4m[40m7.1.3[24m  [4mQuoting[0m
       [40mWords, and sections of words, may be quoted.  If any part of[0m
       [40ma word is quoted it cannot be a keyword.[0m

       [40mThis means that, if you want to use [1mif [22mas a word, rather[0m
       [40mthan a keyword, at least one of its characters needs to be[0m
       [40mquoted, for example [1m'if'[22m.[0m

       [40mBoth single ([1m'[22m) and double ([1m"[22m) quotes are understood by[0m
       [1m[40mcook[22m, and one may enclose the other.  If a quote is escaped[0m
       [40mit does not open or close a quote as it usually would.[0m

       [1m[40mCook [22mdoes not like newlines within quotes.  This is a[0m
       [40mgenerally good heuristic for catching unbalanced quotes.  If[0m
       [40myou really want a newline within a string, use the \n[0m
       [40mescape.[0m

       [4m[40m7.1.4[24m  [4mComments[0m
       [40mComments are delimited on the left by [1m/*[22m, and on the right[0m
       [40mby [1m*/[22m.  If the [1m/ [22mcharacter has been escaped or quoted, it[0m
       [40mdoesn't introduce a comment.  Comments may be nested.[0m
       [40mComments may span multiple lines.  Comments are replaced by[0m
       [40mone logical space.[0m

       [4m[40m7.2[24m  [4mPreprocessor[0m

       [40mThe preprocessor may be thought of as doing a little work[0m
       [40mbefore the [4mSyntax[24m [4mand[24m [4mSemantics[24m section has its turn.[0m

       [40mThe preprocessor is driven by [4mpreprocessor[24m [4mdirectives[24m.  A[0m
       [40mpreprocessor directive is a line which starts with a hash[0m
       [40m([1m#[22m) character.  Each of the preprocessor directives is[0m
       [40mdescribed below.[0m

       [4m[40m7.2.1[24m  [4minclude[0m
       [40mThe most common preprocessor directive is[0m
            [40m#include "[4mfilename[24m"[0m

       [40mThis preprocessor directive is processed as if the contents[0m
       [40mof the named file had appeared in the cookbook, rather than[0m
       [40mthe preprocessor include directive.[0m


       
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       [40mThe most common use of the #include directive is to include[0m
       [40msystem cookbooks.  For example, many small programs can be[0m
       [40mdeveloped using the following simple cookbook:[0m
            [40m#include "c"[0m
            [40m#include "program"[0m

       [40mThe standard places to search are first any path specified[0m
       [40mwith the [1m-Include [22mcommand line option, and then [4m$HOME/.cook[0m
       [40mand then [4m/usr/local/share/cook[24m in that order.[0m

       [4m[40m7.2.2[24m  [4minclude-cooked[0m
       [40mThis directive looks similar to the one above, but do not be[0m
       [40mdeceived.[0m
            [40m#include-cooked [4mfilename[24m...[0m
       [40mYou may name several filenames on the line, and they may be[0m
       [40mexpressions.[0m

       [40mThe search path used for these files is the same as that[0m
       [40mused for other cooked files, see the [4msearch_list[24m variable[0m
       [40mand the [4mresolve[24m built-in function for more information.  The[0m
       [40morder in which you set the [4msearch_list[24m and the [4m#include-[0m
       [4m[40mcooked[24m directives is important.  Always set the [4msearch_list[0m
       [40mvariable first, if you are going to use it.[0m

       [40mFiles included in this way are checked, after they have been[0m
       [40mread, to make sure they are up-to-date.  If they are not,[0m
       [1m[40mcook [22mbrings them up-to-date and then re-reads the cookbook[0m
       [40mand starts over.[0m

       [40mYou will only get a warning if the files are not found.[0m
       [40mUsually, [1mcook [22mwill either succeed in constructing them, in[0m
       [40mwhich case they will be present the second time around, or a[0m
       [40mfatal error will result from attempting to construct them.[0m
       [40mNote that it is possible to go into an infinite loop, if the[0m
       [40mfiles are constantly out-of-date.[0m

       [40mThe commonest use of this construct is maintaining include[0m
       [40mfile dependency lists for source files.[0m
            [40mobj = [fromto %.c %.o [glob *.c]];[0m

            [40m%.o: %.c[0m
            [40m{[0m
                    [40m[cc] [cc_flags] -c %.c;[0m
            [40m}[0m

            [40m%.c.d: %.c[0m
            [40m{[0m
                    [40mc_incl -prefix "'%.o "[target]": %.c'" -suffix "';'"[0m
                            [40m-no-cache %.c > [target];[0m
            [40m}[0m

            [40m#include-cooked [fromto %.o %.c.d [obj]][0m
       [40mThis cookbook fragment shows how include file dependencies[0m
       [40mare maintained.  Notice how the [4m.d[24m files have a recipe to[0m

       
       Peter Miller                                         Page 43





       Cook                                              User Guide



       [40mconstruct them, and that they are also included.  [1mCook [22mwill[0m
       [40mbring them up-to-date if necessary, and then re-read the[0m
       [40mcookbook, so that it is always working with the current[0m
       [40minclude dependencies.  (The doubly nested quotes are to[0m
       [40minsulate the spaces and special characters from both [1mcook[0m
       [40mand the shell.)[0m

       [40mYou could use [4mgcc[24m [4m-MM[24m if you prefer (you will need some[0m
       [40mextra shell script).  The [4mc_incl[24m program understands absent[0m
       [40mfiles better but doesn't understand conditional compilation,[0m
       [40mand [4mgcc[24m understands conditional compilation but gives fatal[0m
       [40merrors for absent include files.  Warning: If you are using[0m
       [4m[40msearch_list[24m you [1mmust [22muse [4mc_incl[24m.  Gcc returns complete[0m
       [40mpaths, which will result in [1mcook [22mfailing to notice when an[0m
       [40minclude file is copied from later in the search list to[0m
       [40mearlier, and then modified.[0m

       [40mThere are times when you don't want the #include-cooked[0m
       [40mdirectives to be acted upon.  You can over-ride it using the[0m
       [40m--no-include-cooked command line option, but it is often[0m
       [40measier to use the [command-line-goals] variable, and say[0m
       [40msomething like[0m
            [40m#if [not [match %1clean%2 [command-line-goals]]][0m
            [40m#include-cooked [fromto %.o %.c.d [obj]][0m
            [40m#endif[0m
       [40mThis construct means that whenever an explicit ``clean''[0m
       [40mgoal (or similar) is requested, the #include-cooked lines[0m
       [40mwill not be performed.  This is sensible, because cleaning[0m
       [40mactions usually remove dependency files; there is no point[0m
       [40mmaking sure they are up-to-date first.[0m

       [4m[40m7.2.3[24m  [4minclude-cooked-nowarn[0m
       [40mThis directive is almost identical to the one above, but no[0m
       [40mwarning is issued for absent files.[0m
            [40m#include-cooked-nowarn [4mfilename[24m...[0m
       [40mYou may name several filenames on the line, and they may be[0m
       [40mexpressions.[0m

       [4m[40m7.2.4[24m  [4mif[0m
       [40mThe #if directive may be used to conditionally pass tokens[0m
       [40mto the syntax and semantics processing.  Directives take the[0m
       [40mform[0m
            [40m#if [4mexpression1[0m
            [4m[40msomething1[0m
            [40m#elif [4mexpression2[0m
            [4m[40msomething2[0m
            [40m#else[0m
            [4m[40msomething3[0m
            [40m#endif[0m
       [40mThere may be any number of elif clauses, and the else clause[0m
       [40mis optional.  Only one of the [4msomethings[24m will be passed[0m
       [40mthrough.[0m



       
       Peter Miller                                         Page 44





       Cook                                              User Guide



       [40m[4m7.2.5[24m  [4mifdef[0m
       [40mThis directive takes a similar form to the if directive, but[0m
       [40mwith a different first line:[0m
            [40m#ifdef [4mvariable[0m
       [40mThis is syntactic sugar for[0m
            [40m#if [defined [4mvariable[24m][0m
       [40mThis is of most use in bracketing #include directives.[0m

       [4m[40m7.2.6[24m  [4mifndef[0m
       [40mThis directive takes a similar form to the if directive, but[0m
       [40mwith a different first line:[0m
            [40m#ifndef [4mvariable[0m
       [40mThis is syntactic sugar for[0m
            [40m#if [not [defined [4mvariable[24m]][0m
       [40mThis is of most use in bracketing #include directives.[0m

       [4m[40m7.2.7[24m  [4mpragma[0m
       [40mThis is for the addition of extensions.[0m

       [4m[40m7.2.7.1[24m  [4monce[0m
       [40mThis directive is to ensure that include files in which it[0m
       [40mappears are included exactly once.[0m

       [40mThis directive has the form[0m
            [40m#pragma once[0m

       [4m[40m7.2.7.2[24m  [4munknown[24m [4mextensions[0m
       [40mAny pragma extensions not recognized will be ignored.[0m



























       
       Peter Miller                                         Page 45





       Cook                                              User Guide



       [40m[4m7.3[24m  [4mSyntax[24m [4mand[24m [4mSemantics[0m

       [40mThe syntax is described using ``train track'' diagrams, with[0m
       [40mprose descriptions of the related semantics.[0m

       [4m[40m7.3.1[24m  [4mOverall[24m [4mStructure[0m
       [40mThe general form of the cookbook is defined as[0m
       [40m-c-o-o-k-b-o-o-k------+------------------------------------------+-----[0m
                       [40m-----------------------------     ------[0m
                            [40m------                  ------[0m
                        [40m-------+-----+-----+----------+-----[0m
                                 [40m----+-s-t-m-t+|   ------[0m
                                    [40m+--------[0m
                                  [40m--+f-u-n-c-tion+-----[0m
                                    [40m--------+[0m

       [40mA cookbook is defined as a sequence of statements.  Each[0m
       [40mstatement statement is executed.  For a definition of what[0m
       [40mit means when a statement is executed, see the individual[0m
       [40mstatement definitions.[0m

       [40mThe nonterminal symbol [4mstatement[24m will be defined in the[0m
       [40msections below.[0m

       [40mPlease note that a statement is not always evaluated when is[0m
       [40mis read, but at specific, well defined times.[0m

       [4m[40m7.3.2[24m  [4mThe[24m [4mCompound[24m [4mStatement[0m
       [40mA nonterminal symbol which will be referred to below is the[0m
       [4m[40mcompound_statement[24m symbol, defined as follows:[0m
       [40mcstmt            -------                        -------[0m
       [40m------------------{-------------------------------}--------------[0m
                             [40m------ -----------    ------[0m
                                  [40m---+-----+  ------[0m
                               [40m------+-s-t-m-t++----+-----[0m

       [40mThe compound statement may be used anywhere a statement may[0m
       [40mbe, and in particular[0m
       [40mstmt                          +-----+[0m
       [40m------------------------------+-c-s-t-m-t+--------------------------[0m


       [4m[40m7.3.3[24m  [4mVariables[24m [4mand[24m [4mExpressions[0m
       [1m[40mCook [22mprovides variables to the user to simplify things.[0m

       [4m[40m7.3.3.1[24m  [4mThe[24m [4mAssignment[24m [4mStatement[0m
       [40mIt is possible to assign to variables with the following[0m
       [40mstatement.[0m
       [40mstmt                  +----+  ----+-----+  ------[0m
       [40m----------------------+-e-x-p-r+---=---+e-x-p-r-s-+--;--------------------[0m

       [40mWhen this statement is executed, the variable whose name the[0m
       [40mleft hand expression evaluates to will be assigned the value[0m
       [40mthat the right hand expression list evaluates to.[0m

       
       Peter Miller                                         Page 46





       Cook                                              User Guide



       [40mFor example:[0m
            [40mprogram_obj = foo.o bar.o baz.o;[0m

       [1m[40mNote: [22mIt is possible to over-ride the value of built-in[0m
       [40mfunctions and variables with this statement.  This will not[0m
       [40mproduce an error message, however it is usually not[0m
       [40mdesirable as it will change the meaning of the rest of your[0m
       [40mcookbook.[0m

       [4m[40m7.3.3.2[24m  [4mThe[24m [4mAssign-Append[24m [4mStatement[0m
       [40mIt is possible to append to the value of variables with the[0m
       [40mfollowing statement.[0m
       [40mstmt                  +----+  ----+-----+  ------[0m
       [40m----------------------+-e-x-p-r+---+-=--+e-x-p-r-s-+--;--------------------[0m

       [40mWhen this statement is executed, the variable whose name the[0m
       [40mleft hand expression evaluates to will have its value[0m
       [40mappended by the value that the right hand expression list[0m
       [40mevaluates to.  Expression values are lists of words,[0m
       [40mappending means to append to the word list; it does [4mnot[24m mean[0m
       [40mappending to the last string of the value.[0m

       [40mFor example:[0m
            [40mprogram_obj += [glob "deeper/*.o" ];[0m

       [1m[40mNote: [22mIt is possible to over-ride the value of built-in[0m
       [40mfunctions and variables with this statement.  This will not[0m
       [40mproduce an error message (unless evaluating them with no[0m
       [40marguments is an error), however it is usually not desirable[0m
       [40mas it will change the meaning of the rest of your cookbook.[0m

       [4m[40m7.3.3.3[24m  [4mThe[24m [4mSetenv[24m [4mStatement[0m
       [40mIt is possible to assign to environment variables with the[0m
       [40mfollowing statement.[0m
       [40mstmt             -------+----+  ----+-----+  ------[0m
       [40m-----------------s-e-t-e-n-v--+-e-x-p-r+---=---+e-x-p-r-s-+--;----------------[0m

       [40mWhen this statement is executed, the environment variable[0m
       [40mwhose name the left hand expression evaluates to will be[0m
       [40massigned the value that the right hand expression list[0m
       [40mevaluates to.  It is an error if the variable does not[0m
       [40malready exist.[0m

       [40mFor example:[0m
            [40msetenv PATH = [getenv PATH]":"[getenv HOME]/more-bin;[0m

       [4m[40m7.3.3.4[24m  [4mThe[24m [4mSetenv-Append[24m [4mStatement[0m
       [40mIt is possible to append to the value of an environment[0m
       [40mvariables with the following statement.[0m
       [40mstmt             -------+----+  ----+-----+  ------[0m
       [40m-----------------s-e-t-e-n-v--+-e-x-p-r+---+-=--+e-x-p-r-s-+--;----------------[0m

       [40mWhen this statement is executed, the environment variable[0m
       [40mwhose name the left hand expression evaluates to will have[0m

       
       Peter Miller                                         Page 47





       Cook                                              User Guide



       [40mits value appended by the value that the right hand[0m
       [40mexpression list evaluates to.  Evaluation is analogous to[0m
       [40mthe assign-append statement.[0m

       [40mFor example:[0m
            [40msetenv FRED += nurk;[0m

       [4m[40m7.3.3.5[24m  [4mExpressions[0m
       [40mMany definitions make reference to the [4mexpr,[24m [4melist[24m and [4mexprs[0m
       [40mnonterminal symbols.  These are defined as follows.[0m

       [40mThe [4melist[24m is a list of at least one expression,[0m
                                    [40m-----------[0m
                                  [40m---+------  ------[0m
       [40m-e-l-i-s-t-------------------------+-e-x-p-r-+----+---------------------[0m
                                     [40m-----+|[0m

       [40mwhereas the [4mexprs[24m is a list of zero or more expressions.[0m
       [40m-e-x-p-r-s----------------------------------------------------------[0m
                                  [40m------      ------[0m
                                    [40m--+----+-----[0m
                                      [40m+e-l-i-s-t+[0m


       [40mAn expression is composed of words, variable references,[0m
       [40mfunction invocations, or concatenation of expressions.  The[0m
       [40mconcatenation is implied by abutting the two parts of the[0m
       [40mexpression together, [4me.g.:[24m "[fred]>thing" is an indirection[0m
       [40mon [4mfred[24m concatenated with the literal word ">thing".[0m
       [40mexpr                           ------[0m
       [40m--------------------------------[4mw[24m-[4mo[24m-[4mr[24m-[4md[24m----------------------------[0m
                            [40m----------+----- ------- ------[0m
                             [40m------[---+e-l-i-s-t+--]-------[0m
                                  [40m---------+ ------[0m
                             [40m--+----+-------+----+-----[0m
                               [40m+-e-x-p-r+  -[4mc[24m-[4ma[24m-[4mt[24m  +-e-x-p-r+[0m


       [40mWhen an [1m[[4m[22melist[24m[1m] [22mexpression is evaluated, the [4melist[24m is[0m
       [40mevaluated first.  If the result is a single word, then a[0m
       [40mvariable of that name is searched for.  If found the value[0m
       [40mof an expression of this form is the value of the variable.[0m

       [40mIf there is no variable of the given name, or the [4melist[0m
       [40mevaluated to more than one word, the first word is taken to[0m
       [40mbe a built-in function name.  If there is no function of[0m
       [40mthis name it is an error.[0m

       [40mThe [4mcat[24m operator works as one would expect, joining the last[0m
       [40mword of the left expression and the first word of the right[0m
       [40mexpression together, and otherwise leaving the order of the[0m
       [40mexpressions alone.  One usually uses the trivial case of[0m
       [40msingle word expressions.  For more complex concatenations,[0m
       [40msee the [catenate] and [join] built-in functions.[0m

       
       Peter Miller                                         Page 48





       Cook                                              User Guide



       [40m[4m7.3.4[24m  [4mRecipes[0m
       [40mA number of forms of [4mstatement[24m are concerned with telling[0m
       [1m[40mcook [22mhow to cook things.  There are three forms, the[0m
       [4m[40mexplicit[24m recipe, the [4mimplicit[24m recipe, and the [4mingredients[0m
       [40mrecipe.[0m

       [4m[40m7.3.5[24m  [4mThe[24m [4mExplicit[24m [4mRecipe[24m [4mStatement[0m
       [40mThe explicit recipe has the form[0m
       [40mstmt       +----+  ---+-----++-----+ +----++-----+-+---+[0m
       [40m-----------+e-l-i-s-t+--:---+e-x-p-r-s-++-f-l-a-g-s+-+g-a-t-e-++-c-s-t-m-t+-+u-s-e-++------[0m

       [40mThe target(s) of the recipe are to the left of the colon,[0m
       [40mand the ingredients, if any, are to the right.  The[0m
       [40mstatements, usually commands, which are to be performed to[0m
       [40m(re)construct the target(s) are contained in the compound[0m
       [40mstatement.  The expressions are only evaluated into words[0m
       [40mwhen the recipe is executed.  Recipe bodies may have local[0m
       [40mvariables.[0m

       [40mFor example:[0m
            [40mprogram: [program_obj][0m
            [40m{[0m
                    [40m/* use [need] rather than [program_obj] in case[0m
                       [40mthere are additional ingredients recipes[0m
                       [40m(see below).  */[0m
                    [40mcc -o program [need];[0m
            [40m}[0m

       [40mThe target expressions and recipe flags are evaluated when[0m
       [40mthe recipe is instantiated.  The ingredients expressions and[0m
       [40mthe recipe gate are evaluated at graph building time.  The[0m
       [40mbody and use statements are executed at graph walking time.[0m

       [40mThe recipes also take a ``[4mhost-binding[24m'' attribute.  See the[0m
       [40mchapter on Cooking in Parallel for how this is attribute is[0m
       [40mwritten and used.  If the host binding flag is given, it is[0m
       [40malways used, even when not cooking in parallel.  If it is[0m
       [40mnot given [4mand[24m you are cooking in parallel, it will default[0m
       [40mto the contents of the [parallel_hosts] variable.[0m

       [4m[40m7.3.5.1[24m  [4mRecipe[24m [4mFlags[0m
       [40mThe [4mflags[24m are defined as follows.[0m
       [40m-f-l-a-g-s----------------------------------------------------------[0m
                               [40m------            ------[0m
                                 [40m-------+-----+-----[0m
                                   [40m-s-e-t--+e-x-p-r-s-+[0m

       [40mRecipe flags are evaluated when the recipe targets are[0m
       [40mevaluated.  At this time, [4mnone[24m of the [target], [targets],[0m
       [40m[need] or [younger] variables are set, and neither are any[0m
       [40mof the pattern matches (%, %1, [4metc[24m) available.[0m

       [40mA number of flags may be used[0m


       
       Peter Miller                                         Page 49





       Cook                                              User Guide



       [40mclearstat The last-modified time of the files named in[0m
                 [40mexecuted commands will be removed from the last-[0m
                 [40mmodified time cache.  This is essential for[0m
                 [40mcommands such as [4mrm[24m(1) and [4mmv[24m(1).[0m

       [40mnoclearstat Do not clear entries from the last-modified time[0m
                 [40mcache.  This is usually the default.[0m

       [40mdefault   If no targets are specified on the command line,[0m
                 [40mthe first recipe with the [4mdefault[24m flag will be[0m
                 [40mused.  Not meaningful for implicit recipes.[0m

       [40mnodefault If no targets are specified on the command line,[0m
                 [40mand there are no recipes with the [4mdefault[24m flag[0m
                 [40mset, the first recipe [1mwithout [22mthe [4mnodefault[24m flag[0m
                 [40mwill be used.  Not meaningful for implicit[0m
                 [40mrecipes.[0m

       [40merrok     If the [4merrok[24m flag is specified, the commands[0m
                 [40mwithin the actions bound to the recipe must always[0m
                 [40mbe successful.[0m

       [40mnoerrok   Exit status from commands will be ignored.  This[0m
                 [40mis usually the default.[0m

       [40mfingerprint File fingerprints are used to supplement last-[0m
                 [40mmodified time information about files, which is[0m
                 [40mhow [4mcook[24m determines if a file is out-of-date and[0m
                 [40mneeds to be cooked.  If a file appears to have[0m
                 [40mchanged, from the last-modified time, it is[0m
                 [40mfingerprinted, and the fingerprint compared with[0m
                 [40mwhat it was in the past.  The file has changed if[0m
                 [40mand only if the fingerprint has also changed.  A[0m
                 [40mcryptographically strong hash is used, so the[0m
                 [40mchance of a file edit producing an identical[0m
                 [40mfingerprint is less than 1 in 2**200.[0m
                 [40mFingerprinting is disabled by default.[0m

       [40mnofingerprint Do not use file fingerprinting.  This is[0m
                 [40musually the default.[0m

       [40mforced    If the [4mforced[24m flag is specified, the actions bound[0m
                 [40mto the recipe will always be evaluated.[0m

       [40mnoforced  If the [4mnoforced[24m flag is specified, the actions[0m
                 [40mbound to the recipe will be evaluated when the[0m
                 [40mrecipe is logically out-of-date.  This is usually[0m
                 [40mthe default.[0m

       [40mgate-after-ingredients This flags causes the recipe gate to[0m
                 [40mbe evaluated after the ingredients have been[0m
                 [40mevaluated and determined to be cookable.  This is[0m
                 [40musually the default.[0m


       
       Peter Miller                                         Page 50





       Cook                                              User Guide



       [40mgate-before-ingredients This flag causes the recipe gate to[0m
                 [40mbe applied before the ingredients are evaluated[0m
                 [40mand determined to be cookable.  This is useful if[0m
                 [40mthe ingredients evaluation itself needs to be[0m
                 [40mconditional.[0m

       [40mimplicit-ingredients[0m
                 [40mThis flag may be used to specify that a recipe's[0m
                 [40mingredients may be satisfied by implicit recipes.[0m
                 [40mThis is usually the default.[0m

       [40mno-implicit-ingredients[0m
                 [40mThis flag may be used to specify that a recipe's[0m
                 [40mingredients may not be satisfied by implicit[0m
                 [40mrecipes; this is of most use with utilities such[0m
                 [40mas RCS where the recipe writer knows that the[0m
                 [40mingredients cannot be constructed.[0m

       [40minclude-cooked-warning This flag may be used to enable[0m
                 [40mwarnings when the relationship between a target[0m
                 [40mand a derived ingredient appears only in a derived[0m
                 [40mcookbook.  This is usually the default.  This flag[0m
                 [40mis only meaningful at the cookbook level, it is[0m
                 [40mnot meaningful for individial recipes or commands.[0m

       [40mno-include-cooked-warning This flag may be used to disable[0m
                 [40mwarnings when the relationship between a target[0m
                 [40mand a derived ingredient appears only in a derived[0m
                 [40mcookbook.  This flag is only meaningful at the[0m
                 [40mcookbook level, it is not meaningful for[0m
                 [40mindividial recipes or commands.[0m

       [40mingredients-fingerprint This flag may be used to cause[0m
                 [40mrecipes to re-trigger when their ingredients list[0m
                 [40mchages in any way.  This is especially useful, for[0m
                 [40mexample, in causing libraries to be rebuilt when a[0m
                 [40mcontent source file is removed.[0m

       [40mno-ingredients-fingerprint Cancel any active [4mingredients-[0m
                 [4m[40mfingerprint[24m setting.[0m

       [40mmatch-mode-cook Use native Cook pattern matching.[0m

       [40mmatch-mode-regex Use POSIX regular expression pattern[0m
                 [40mmatching.[0m

       [40mmeter     If the [4mmeter[24m flag is specified, a summary of the[0m
                 [40mCPU usage by the commands within this recipe will[0m
                 [40mbe printed after each command.  The silent options[0m
                 [40moverride this option.[0m

       [40mnometer   Do not meter commands.  This is usually the[0m
                 [40mdefault.[0m


       
       Peter Miller                                         Page 51





       Cook                                              User Guide



       [40mmkdir     If the [4mmkdir[24m flag is specified, the directories of[0m
                 [40many targets will be created before the actions[0m
                 [40mbound to the recipe are evaluated.[0m

       [40mnomkdir   If the [4mnomkdir[24m flag is specified, the directories[0m
                 [40mof any targets will need to be created by the[0m
                 [40mactions bound to the recipe.  This is usually the[0m
                 [40mdefault.[0m

       [40mprecious  If the [4mprecious[24m flag is specified, if the actions[0m
                 [40mbound to the recipe fail, the targets of the[0m
                 [40mrecipe will not be deleted.[0m

       [40mnoprecious If the [4mnoprecious[24m flag is specified, if the[0m
                 [40mactions bound to the recipe fail, the targets of[0m
                 [40mthe recipe will be deleted.  This is usually the[0m
                 [40mdefault, so that erroneous targets will be re-[0m
                 [40mcooked.[0m

       [40mrecurse   If this flag is specified, recipes will recurse[0m
                 [40mupon themselves if one of their ingredients[0m
                 [40mmatches one of their targets.  This can cause[0m
                 [40mproblems, and so it is not the default.[0m

       [40mnorecurse If this flag is specified, the recipe will not[0m
                 [40mrecurse if one of its ingredients matches one of[0m
                 [40mits targets.  This is the default.[0m

       [40msilent    If the [4msilent[24m flag is specified, the commands[0m
                 [40mwithin the actions bound to the recipe will not be[0m
                 [40mechoed.[0m

       [40mnosilent  Commands will be echoed.  This is usually the[0m
                 [40mdefault.[0m

       [40mstripdot  This option causes [1mcook [22mto remove leading "./"[0m
                 [40mprefixes from filenames.  This is usually the[0m
                 [40mdefault.[0m

       [40mnostripdot This option causes [1mcook [22mto leave leading "./"[0m
                 [40mprefixes on filenames.[0m

       [40mtime-adjust This option causes [1mcook [22mto check the last-[0m
                 [40mmodified time of the targets of recipes, and[0m
                 [40madjust them if necessary, to make sure they are[0m
                 [40mconsistent with (younger than) the last-modified[0m
                 [40mtimes of the ingredients.  This usually adjusts[0m
                 [40mthe file time into the (near) future.  A warning[0m
                 [40mmessage will be printed, telling you how many[0m
                 [40mseconds the file was adjusted.  This results in[0m
                 [40mmore system calls, and can slow things down on[0m
                 [40msome systems6.[0m



       
       Peter Miller                                         Page 52





       Cook                                              User Guide



       [40mno-time-adjust Do not adjust the file last-modified times[0m
                 [40mafter performing the body of a recipe.  This is[0m
                 [40musually the default.[0m

       [40mtime-adjust-back This option causes [1mcook [22mto force the last-[0m
                 [40mmodified time of the targets of recipes to be[0m
                 [40mexactly one (1) second younger than their youngest[0m
                 [40mingredient.  This usually adjusts the file time[0m
                 [40minto the (recent) past.  A warning message will be[0m
                 [40mprinted, telling you how many seconds the file was[0m
                 [40madjusted.  This results in more system calls, and[0m
                 [40mcan slow things down on some systems.  This is[0m
                 [40mprimarily useful when some later process is going[0m
                 [40mto compress file modification times; this provides[0m
                 [40msmarter compression.[0m

       [40munlink    If the [4munlink[24m flag is specified, of any targets[0m
                 [40mwill be unlinked before the actions bound to the[0m
                 [40mrecipe are performed.[0m

       [40mnounlink  If the [4mnounlink[24m flag is specified, the recipe[0m
                 [40mtargets are not removed before the actions bound[0m
                 [40mto the recipe are performed.  This is usually the[0m
                 [40mdefault.[0m

       [40mEach flag may also be specified in the negative, by adding a[0m
       [40m"no" prefix, to override any existing positive default[0m
       [40msetting.  There is a strict precedence defined for the[0m
       [40mvarious levels of flag setting, see the end of the "How Cook[0m
       [40mWorks" chapter for details.[0m

       [4m[40m7.3.5.2[24m  [4mRecipe[24m [4mGate[0m
       [40mEach recipe may have a [4mgate[24m.  The gate is a way of[0m
       [40mspecifying a conditional recipe; if the condition is not[0m
       [40mtrue, the recipe is not used.  The condition is in addition[0m
       [40mto the condition that the ingredients are cookable.[0m
       [40m-g-a-t-e-----------------------------------------------------------[0m
                                [40m------           ------[0m
                                 [40m-------+----+-----[0m
                                    [40m-i-f--+-e-x-p-r+[0m


       [40mFor example:[0m
            [40mprogram: [program_obj][0m
                    [40mif [not [in horrible.o [program_obj]]][0m
            [40m{[0m
                    [40mcc -o program [program_obj];[0m
            [40m}[0m


       ____________________

       6. This  flag  was once named the ``update'' flag.  The name
          was changed to more closely reflect  its  function.   The
          old name continues to work.

       Peter Miller                                         Page 53





       Cook                                              User Guide



       [40m[4m7.3.5.3[24m  [4mThen[24m [4mClause[0m
       [40mThere are times when it is necessary to know that a recipe[0m
       [40mhas been applied, but because the recipe was up-to-date, the[0m
       [40mrecipe body was not run.[0m
       [40m-u-s-e------------------------------------------------------------[0m
                              [40m------              ------[0m
                                [40m--------+-----+-----[0m
                                  [40mt-h-e-n--+-c-s-t-m-t+[0m

       [40mThe then-clause is run every time the recipe is applied,[0m
       [40meven if the recipe is up-to-date.  It will be run after the[0m
       [40mrecipe body, if the recipe body is run.  All of the usual[0m
       [40mpercent (%) substitutions and automatic variables will[0m
       [40mapply.  Recipe then-clauses may have local variables.[0m

       [40mFor example:[0m
            [40mprogram: [program_obj][0m
            [40m{[0m
                    [40mcc -o program [program_obj];[0m
            [40m}[0m
            [40mthen[0m
            [40m{[0m
                    [40minstall-set += program;[0m
            [40m}[0m

       [4m[40m7.3.5.4[24m  [4mDouble[24m [4mColon[0m
       [40mMost cookbooks are constructed so that if [1mcook [22mfinds a[0m
       [40msuitable recipe for the target it is currently constructing,[0m
       [40mit will apply the recipe and then conclude that it has[0m
       [40mfinished constructing the target.  In some rare cases you[0m
       [40mwill want [1mcook [22mto keep going after applying a recipe.  To[0m
       [40mspecify this use a ``double colon'' construction:[0m
       [40mstmt       +----+  ---+-----++-----+ +----++-----+-+---+[0m
       [40m-----------+e-l-i-s-t+--:-:--+e-x-p-r-s-++-f-l-a-g-s+-+g-a-t-e-++-c-s-t-m-t+-+u-s-e-++------[0m

       [40mThis operates like a normal explicit recipe, but [1mcook [22mwill[0m
       [40mcontinue on looking for recipes after applying this one.  As[0m
       [40msoon as an applicable ``single colon'' recipe is found and[0m
       [40mapplied, [1mcook [22mwill conclude that it has finished[0m
       [40mconstructing the target.[0m

       [40mFor example:[0m
            [40mall:: programs[0m
            [40m{[0m
                    [40m[print "all programs done"];[0m
            [40m}[0m
            [40mall:: libraries[0m
            [40m{[0m
                    [40m[print "all libraries done"];[0m
            [40m}[0m

       [4m[40m7.3.6[24m  [4mThe[24m [4mImplicit[24m [4mRecipe[24m [4mStatement[0m
       [40mImplicit recipes are distinguished from explicit recipes in[0m
       [40mthat and implicit recipe has a target with a '[1m%[22m' character[0m

       
       Peter Miller                                         Page 54





       Cook                                              User Guide



       [40min it.[0m

       [4m[40m7.3.6.1[24m  [4mSimple[24m [4mForm[0m
       [40mIn general the user will rarely need to use the implicit[0m
       [40mrecipe form, as there are a huge range of implicit recipes[0m
       [40malready defined in the system default recipes.[0m

       [40mAn example of this recipe form is[0m
            [40m%: %.gz[0m
            [40m{[0m
                    [40mgzcat %.gz > %;[0m
            [40m}[0m
       [40mThis recipe tells [1mcook [22mhow to use the [4mgzcat[24m(1) program.[0m

       [4m[40m7.3.6.2[24m  [4mComplex[24m [4mForm[0m
       [40mThe implicit recipe recipe has a second form where there are[0m
       [40mtwo sets of ingredients, separated by another colon.  In[0m
       [40mthis form, the ingredients specified in the first[0m
       [40mingredients list are used to determine the applicability of[0m
       [40mthe recipe; if these are all constructible then the recipe[0m
       [40mwill be applied, if any are not constructible then the[0m
       [40mrecipe will not be applied.  If the recipe is applied, the[0m
       [40mingredients specified in the second ingredients list are[0m
       [40mrequired to be constructible.  The the second ingredients[0m
       [40mlist section is known as the [4mforced[24m [4mingredients[24m section.[0m

       [1m[40mNote: [22mif you want the first ingredients list to be empty you[0m
       [4m[40mmust[24m separate the two colons with a space, otherwise [1mcook[0m
       [40mwill think this is a ``double colon'' recipe.[0m

       [40mAn example of this is the C recipe[0m
            [40m%.o: %.c: [collect c_incl -api %.c][0m
            [40m{[0m
                    [40mcc -c %.c;[0m
            [40m}[0m
       [40mThis recipe is applied if the [4m%.c[24m file can be constructed,[0m
       [40mand is not applied if it cannot be constructed.  The include[0m
       [40mdependencies are only expressed if the recipe is going to be[0m
       [40mapplied; but if they are expressed, they [4mmust[24m be[0m
       [40mconstructible.  This means that absent include files[0m
       [40mgenerate an error7.[0m

       [40mThe naive form of this recipe[0m
            [40m%.o: %.c [collect c_incl -api %.c][0m
            [40m{[0m
                    [40mcc -c %.c;[0m
            [40m}[0m
       [40mwill attempt to apply the [4mc_incl[24m command before the [4m%.c[24m file[0m
       [40mis guaranteed to exist.  This is because the [4mexprs2[24m is[0m

       ____________________

       7. This is not the recommended way of determining C  include
          dependencies,  see  the  ``Include Dependencies'' chapter
          for more information.

       Peter Miller                                         Page 55





       Cook                                              User Guide



       [40mperformed after the [4mexprs1[24m all exist (because they are[0m
       [40mconstructible, they have been constructed).  In this naive[0m
       [40mform, absent include files result in the recipe not being[0m
       [40mapplied.[0m

       [4m[40m7.3.6.3[24m  [4mDouble[24m [4mColon[0m
       [40mJust as explicit recipes have a ``double colon'' form, so do[0m
       [40mboth types of implicit recipes.  The semantics are[0m
       [40midentical, with [1mcook [22mlooking for more than one applicable[0m
       [40mimplicit recipe, but stopping if it finds an applicable[0m
       [40m``single colon'' implicit recipe.[0m

       [40mAs stated earlier in this manual, [1mcook [22mfirst scans for[0m
       [40mexplicit recipes before scanning for implicit recipes.  If[0m
       [40man explicit recipe has been applied, [1mcook [22mwill not also look[0m
       [40mfor applicable implicit recipes, even if all the applicable[0m
       [40mexplicit recipes were double colon recipes.[0m

       [4m[40m7.3.7[24m  [4mThe[24m [4mIngredients[24m [4mRecipe[24m [4mStatement[0m
       [40mThe ingredients recipe has the form[0m
       [40mstmt            +----+  ---+-----++-----++----+   ------[0m
       [40m----------------+e-l-i-s-t+--:---+e-x-p-r-s-++f-l-a-g-s-++-g-a-t-e+---;-------------[0m

       [40mThe target(s) of the recipe are to the left of the colon,[0m
       [40mand the prerequisites are to the right.  There are no[0m
       [40mstatements to perform to cook the targets of this recipe, it[0m
       [40mis simply supplementary to any other recipe, usually an[0m
       [40mimplicit recipe.[0m

       [40mFor example:[0m
            [40mprogram: batman.o robin.o;[0m

       [40mThe right-hand-side expressions are only evaluated into[0m
       [40mwords when the recipe is instantiated.[0m

       [40mIngredients recipes are usually explicit, but it is also[0m
       [40mvalid to use implicit ingredients recipes.[0m

       [40mFor example:[0m
            [40msome-%-program: %.o;[0m

       [4m[40m7.3.8[24m  [4mThe[24m [4mCascade[24m [4mRecipe[24m [4mStatement[0m
       [40mThe cascade recipe statement has the form[0m
        [40mstmt            --------+----+  ----+----+  ------[0m
       [40m-----------------c-a-s-c-a-d+e -+e-l-i-s-t+---=---+e-l-i-s-t+--;----------------[0m

       [40mThis recipe specifies on its right-hand-side additional[0m
       [40mingredients for any recipe which has ingredients mentioned[0m
       [40mon the left-hand-side of this cascade recipe.[0m

       [40mUnlike all other recipe forms, both the left-hand-side [4mand[0m
       [40mthe right-hand-side are evaluated when the recipe is[0m
       [40minstantiated.[0m


       
       Peter Miller                                         Page 56





       Cook                                              User Guide



       [40mFor example:[0m
            [40mcascade batman.c = robin.h;[0m
            [40mcascade somelib.a = some-deeper-lib.a;[0m

       [4m[40m7.3.9[24m  [4mCommands[0m
       [40mCommands may take several forms in [1mcook[22m.  They all have one[0m
       [40mthing in common; they execute a command.[0m

       [4m[40m7.3.10[24m  [4mThe[24m [4mSimple[24m [4mCommand[24m [4mStatement[0m
       [40mThe simplest command form is[0m
       [40mstmt                     +----++-----+  ------[0m
       [40m-------------------------+e-l-i-s-t++-f-l-a-g-s+---;----------------------[0m

       [40mWhen executed, the [4melist[24m is evaluated into a word list and[0m
       [40mused as a command to be passed to the operating system.  On[0m
       [40mUNIX this usually means that a shell is invoked to run the[0m
       [40mcommand, unless the string contains no shell meta-[0m
       [40mcharacters.[0m

       [40mThe [4mflags[24m are those which may be specified in the explicit[0m
       [40mrecipe statement.  They have a higher precedence than either[0m
       [40mthe [4mset[24m statement or the recipe flags.[0m

       [40mSome characters in commands are special both to the shell[0m
       [40mand to cook.  You will need to quote or escape these[0m
       [40mcharacters.  Each command is executed in a separate process,[0m
       [40mso the cd command will not work, you will need to combine it[0m
       [40mwith the relevant commands, not forgetting to escape the[0m
       [40msemicolon (;) characters.[0m

       [4m[40m7.3.11[24m  [4mThe[24m [4mData[24m [4mCommand[24m [4mStatement[0m
       [40mFor programs which require [4mstdin[24m to be supplied by [1mcook [22mto[0m
       [40mperform their functions, the data command statement has been[0m
       [40mprovided.[0m
       [40mstmt         |-----++-----+  ---------+-----+  -----------[0m
       [40m-------------+-e-l-i-s+t++f-l-a-g-s-+--;----d-a-t-a--+-e-x-p-r++-d-a-t-a-e-n+d ----------[0m

       [40mIn this form, the [4mexpr[24m is evaluated and used as input to the[0m
       [40mcommand.  Between the [1mdata [22mand [1mdataend [22mkeywords the[0m
       [40mdefinition of the special symbols and whitespace change.[0m
       [40mThere are only two special symbols, [1m[ [22mand [1m][22m, to allow[0m
       [40mfunctions and variable references to appear in the[0m
       [40mexpression.  In addition, whitespace ceases to have its[0m
       [40musual specialness; it is handed to the command, instead.[0m

       [40mFor those of you familiar with writing shell scripts, this[0m
       [40mis analogous to [4mhere[24m documents.  It allows you to create an[0m
       [40minput file without creating an explicit temporary file.  It[0m
       [40malso allows you to create files that you could not create[0m
       [40musing [4mecho[24m redirected into the file8.[0m

       ____________________

       8. For  example,  Windows NT has a ludicrously small command
          line length limit.

       Peter Miller                                         Page 57





       Cook                                              User Guide



       [40mThe [1mdata [22mkeyword must be the last on a line, whitespace[0m
       [40mafter the [1mdata [22mkeyword up to and including end-of-line, will[0m
       [4m[40mnot[24m be given to the command.[0m

       [40mThe [1mdataend [22mkeyword must appear alone on a line, optionally[0m
       [40msurrounded by whitespace; if it is not alone, it is not a[0m
       [1m[40mdataend [22mkeyword and will not terminate the expression.[0m

       [40mAn example of this may be useful.[0m
            [40m/usr/fred/%: %[0m
            [40m{[0m
                    [40mnewgrp fred;[0m
            [40mdata[0m
            [40mcp % /usr/fred/%[0m
            [40mdataend[0m
            [40m}[0m
       [40mThe [4mnewgrp[24m(1) command is used to change the default group of[0m
       [40ma process, and then throw a shell; so the ``cp'' is executed[0m
       [40mby this sub-shell when it reads its standard input.  If the[0m
       [40mdirectory [4m/usr/fred[24m has read-only permissions for others,[0m
       [40mand group write permissions, and belonged to group [4mfred[24m, and[0m
       [40myou were a member of group [4mfred[24m, the above implicit recipe[0m
       [40mcould be used to copy the file.[0m

       [40mHere is an example of how to cope with stupidly short NT[0m
       [40mcommand lines:[0m
            [40m%.LIB: [%_obj][0m
            [40m{[0m
                    [40mcat > %.contents;[0m
            [40mdata[0m
            [40m[unsplit "\n" [unix-to-dos [need]]][0m
            [40mdataend[0m
                    [40mlink -lib "/out:"[unix-to-dos [target]] @%.contents;[0m
                    [40mrm %.contents;[0m
            [40m}[0m
       [40mThe ``@[4msomething[24m'' means the linker should read file names[0m
       [40mfrom the [4msomething[24m file.[0m

       [40mThis technique will also work with Unix if you have more[0m
       [40mthen 5MB of command line argeuments [4mand[24m the program is[0m
       [40mwritten to have an option something like this (many have a[0m
       [1m[40m-f [22moption).[0m

       [4m[40m7.3.12[24m  [4mThe[24m [4mSet[24m [4mStatement[0m
       [40mIt is possible to override the defaults used by [1mcook [22mor even[0m
       [40mthose specified by the [4mCOOK[24m environment variable, by using[0m
       [40mthe [4mset[24m statement.[0m
       [40mstmt                       -----+-----+  ------[0m
       [40m----------------------------s-e-t--+e-x-p-r-s-+--;------------------------[0m

       [40mThe flag values are those mentioned in the [4mflags[24m clause of[0m
       [40mthe explicit recipe statement.  Many command-line options[0m
       [40mhave equivalent flag settings.  There is no ``unset''[0m
       [40mstatement, to restore the default settings, but it is[0m

       
       Peter Miller                                         Page 58





       Cook                                              User Guide



       [40mpossible to set flags the other way, by adding or removing[0m
       [40mthe ``no'' prefix.[0m

       [40mTo set flags for individual recipes, use the [4mflags[24m clause of[0m
       [40mthe recipe statements.[0m

       [40mTo set flags for individual commands, use the [4mflags[24m clause[0m
       [40mof the command statements.[0m

       [4m[40m7.3.12.1[24m  [4mExamples[0m
       [40mFingerprinting is not used by default, because it can cause[0m
       [40ma few surprises, and takes a little more CPU.  To enable[0m
       [40mfingerprinting for you project, place the statement[0m
            [40mset fingerprint;[0m
       [40msomewhere near the start of your [4mHowto.cook[24m file.  The[0m
       [1m[40m-No_FingerPrint [22mcommand line option can still override this,[0m
       [40mbut the default behavior will be to use fingerprints.[0m

       [40mTo prevent echoing of commands as they are executed, place[0m
            [40mset silent;[0m
       [40msomewhere in your [4mHowto.cook[24m file.  The [1m-NoSilent [22mcommand[0m
       [40mline option can still override this, but the default[0m
       [40mbehavior will be not to echo commands.[0m

       [4m[40m7.3.13[24m  [4mThe[24m [4mFail[24m [4mStatement[0m
       [1m[40mCook [22mcan be forced to think that a recipe has failed by the[0m
       [40muses of the [1mfail [22mstatement.[0m
       [40mstmt                      -----+-----+  ------[0m
       [40m--------------------------f-a-i-l--+e-x-p-r-s-+--;-----------------------[0m

       [40mThis is hugely useful when programs do not return a useful[0m
       [40mexit status, but [4mdo[24m fail.  If they have printed an error[0m
       [40mmessage, but not produced the output file, you could use the[0m
       [40mFail statement without arguments:[0m
            [40mfred: other stuff[0m
                    [40mset unlink[0m
            [40m{[0m
                    [40mbrain-dead [need] -o [target];[0m
                    [40mif [not [exists [target]]] then[0m
                            [40mfail;[0m
            [40m}[0m

       [40mIf you give the Fail statement any arguments, they will be[0m
       [40mprinted as an error message before the recipe fails:[0m
            [40mfred: other stuff[0m
                    [40mset unlink[0m
            [40m{[0m
                    [40mbrain-dead [need] -o [target];[0m
                    [40mif [not [exists [target]]] then[0m
                            [40mfail Did not produce [target] file.;[0m
            [40m}[0m




       
       Peter Miller                                         Page 59





       Cook                                              User Guide



       [40m[4m7.3.14[24m  [4mThe[24m [4mIf[24m [4mStatement[0m
       [40mThe if statement has one of two forms.[0m
       [40mstmt    ----+----+  -----+-----+[0m
       [40m-----+--i-f---+e-x-p-r-+--t-h-e-n--+-s-t-m-t++----------------------------[0m
                                         [40m----------+----+  ------[0m
                                          [40m----e-l-s-e--+s-t-m-t-+-----[0m


       [40mIn nested if statements, the [1melse [22mwill bind to the closest[0m
       [4m[40melse[24m-less [4mif[24m.  An expression is false if and only if all of[0m
       [40mits words are null or it has no words.[0m

       [40mNote that one or both of the subordinate statements may be[0m
       [40mcompound statements, should you need to say something more[0m
       [40mcomplex than a single statement.[0m

       [4m[40m7.3.15[24m  [4mThe[24m [4mLoop[24m [4mand[24m [4mLoopend[24m [4mStatements[0m
       [40mLooping is provided for in [1mcook [22mby the generic infinite loop[0m
       [40mconstruct defined below.[0m
       [40mstmt                        ------+----+[0m
       [40m-----------------------------l-o-o-p--+-s-t-m-t+-----------------------[0m

       [40mA facility is provided to break out of a loop at any point.[0m
       [40mstmt                        ----------------[0m
       [40m----------------------------l-o-o-p-s-t-o-p---;-------------------------[0m

       [40mThe statement following the [1mloop [22mdirective is executed[0m
       [40mrepeatedly forever.  The [1mloopstop [22mstatement is only[0m
       [40msemantically valid within the scope of a [1mloop [22mstatement.[0m

       [40mHere is an example of how to use the loop statement:[0m
            [40mdirs = a b c d;[0m
            [40msrc = ;[0m

            [40mtmp = [dirs];[0m
            [40mloop[0m
            [40m{[0m
                    [40mtmp_dir = [head [tmp]];[0m
                    [40mif [not [tmp_dir]] then[0m
                            [40mloopstop;[0m
                    [40mtmp = [tail [tmp]];[0m
                    [40msrc = [src] [glob [tmp_dir]"/*.c"];[0m
            [40m}[0m

       [40mThere is also a ``for each'' loop variant, allowing a more[0m
       [40mterse expression of exactly the same thing[0m
            [40mdirs = a b c d;[0m
            [40msrc = ;[0m

            [40mloop tmp_dir = [dirs][0m
            [40m{[0m
                    [40msrc = [src] [glob [tmp_dir]"/*.c"];[0m
            [40m}[0m
       [40mYou can use loopstop within such a loop.  Note that the loop[0m

       
       Peter Miller                                         Page 60





       Cook                                              User Guide



       [40mbody [4mmust[24m be a compound statement.[0m

       [4m[40m7.3.16[24m  [4mFunctions[0m
       [40mIt is possible to define your own functions.[0m

       [4m[40m7.3.16.1[24m  [4mFunction[24m [4mDefinition[0m
       [40mUser-defined functions are specified using something similar[0m
       [40mto an assignment.[0m
       [40mfunction           ----------------   ----+-----+[0m
       [40m-------------------f-u-n-c-t-i-o-n-----[4mw[24m-[4mo[24m-[4mr[24m-[4md[24m-----=---+c-s-t-m-t-+--------------[0m

       [40mFunctions must be defined before they are used.[0m

       [40mYou need to make sure you do not re-define a built-in-[0m
       [40mfunction as this may have dire consequences.[0m

       [4m[40m7.3.16.2[24m  [4mThe[24m [4mReturn[24m [4mStatement[0m
       [40mYou return values from a function by using the return[0m
       [40mstatement:[0m
       [40mstmt                     -------+-----+  ------[0m
       [40m-------------------------r-e-t-u-r-n--+e-x-p-r-s-+--;----------------------[0m

       [40mNote that return statements are not meaningful outside a[0m
       [40mfunction definition.[0m

       [4m[40m7.3.16.3[24m  [4mFunction[24m [4mArguments[0m
       [40mThe arguments to the function are passed in the ``arg''[0m
       [40mvariable.  Each argument is also separately defined in the[0m
       [40m``@1'' to ``@9'' variables for direct access.  (If there are[0m
       [40mmore than 9, you will need to use ``[word [4mn[24m [arg]]'' for[0m
       [40margument 10 and later).  These variables are unique for each[0m
       [40mfunction invocation, even if they are nested.[0m

       [40mYou can use the ``@1'' to ``@9'' variables as local[0m
       [40mvariables if you have no need of their values.[0m

       [4m[40m7.3.16.4[24m  [4mExample[0m
       [40mAn example of a function definition is a ``capitalize''[0m
       [40mfunction:[0m
            [40mfunction capitalize =[0m
            [40m{[0m
                    [40m@1 = ;[0m
                    [40mloop @2 = [downcase [arg]][0m
                    [40m{[0m
                            [40m@1 += [upcase [substr 1 1 [@2]]][substr 2 99 [@2]];[0m
                    [40m}[0m
                    [40mreturn [@1];[0m
            [40m}[0m
       [40mThis function capitalizes the first letter of each of its[0m
       [40marguments.[0m

       [40mUser-defined functions are invoked in the same way a built-[0m
       [40min functions.[0m
            [40mhost = [os node];[0m

       
       Peter Miller                                         Page 61





       Cook                                              User Guide



       [40m     Host = [capitalize [host]];[0m

       [40mSee the ``Function Library'' section for additional function[0m
       [40mexamples which are distributed with Cook.[0m

       [4m[40m7.3.16.5[24m  [4mFunction[24m [4mCall[24m [4mStatement[0m
       [40mUser defined functions may be invoked in the same way as[0m
       [40mbuilt-in functions, but they may also be invoked in the same[0m
       [40mway as commands, providing a form of subroutine.[0m
       [40mstmt                 ----------+-----+  ------[0m
       [40m-------------------- -f-u-n-c-t-i-o-n -+e-l-i-s-t-+--;-----------------------[0m


       [40mIf the function return value is not zero, it is considered[0m
       [40mto fail, just as a command would fail.  The commonest use of[0m
       [40mthis is to invoke the built-in print function for debugging[0m
       [40mcookbooks.[0m
            [40mfunction print [__FILE__] [__LINE__] hello [getenv USER];[0m

       [40mThese function calls may be used in recipe bodies, or in the[0m
       [40mgeneral cookbook.[0m

       [4m[40m7.3.16.6[24m  [4mLocal[24m [4mVariables[0m
       [40mFunctions can have local variables simply by using the word[0m
       [40mlocal on the left-hand-side of the assignment.  Care needs[0m
       [40mto be taken with the loop statement and the += assignment,[0m
       [40mas the variable needs to be established as a local variable[0m
       [4m[40mfirst[24m.[0m
            [40mfunction capitalize =[0m
            [40m{[0m
                    [40mlocal result = ;[0m
                    [40mlocal tmp = ;[0m
                    [40mloop tmp = [downcase [arg]][0m
                    [40m{[0m
                            [40mresult += [upcase [substr 1 1 [tmp]]][substr 2 99 [tmp]];[0m
                    [40m}[0m
                    [40mreturn [result];[0m
            [40m}[0m
       [40mFunctions may have as many local variables as they like.[0m

       [40mLocal variables are reentrant.  You can write recursive[0m
       [40mfunctions, and each invocation of the function has an[0m
       [40mindependent set of local variables.[0m

       [40mLocal variables are thread-safe.  You can use the same user-[0m
       [40mdefined function in two parallel threads, and their local[0m
       [40mvariables are completely independent.[0m








       
       Peter Miller                                         Page 62





       Cook                                              User Guide



       [40m[4m8.[24m  [4mBuilt-In[24m [4mFunctions[0m

       [40mThis chapter defines each of the built-in functions of [4mcook[24m.[0m

       [40mA built-in function is invoked by using an expression of the[0m
       [40mform[0m
            [1m[40m[[4m[22mfunc-name[24m [4marg[24m [4marg[24m ...[1m][0m
       [40min most places where a literal word is valid.[0m

       [4m[40m8.1[24m  [4maddprefix[0m

       [40mThe [4maddprefix[24m function is used to add a prefix to a list or[0m
       [40mwords.  This function requires at least one argument.  The[0m
       [40mfirst argument is a prefix to be added to the second and[0m
       [40msubsequent arguments.[0m

       [4m[40m8.1.1[24m  [4mSee[24m [4mAlso[0m
       [40maddsuffix, patsubst, prepost, subst[0m

       [4m[40m8.2[24m  [4maddsuffix[0m

       [40mThe [4maddsuffix[24m function is used to add a suffix to a list or[0m
       [40mwords.  This function requires at least one argument.  The[0m
       [40mfirst argument is a suffix to be added to the second and[0m
       [40msubsequent arguments.[0m

       [4m[40m8.2.1[24m  [4mSee[24m [4mAlso[0m
       [40maddprefix, patsubst, prepost, subst[0m

       [4m[40m8.3[24m  [4mand[0m

       [40mThis function requires at least two arguments, upon which it[0m
       [40mforms a logical conjunction.  The value returned is "1"[0m
       [40m(true) if none of the arguments are "" (false), otherwise ""[0m
       [40m(false) is returned.[0m

       [4m[40m8.3.1[24m  [4mExample[0m
       [40mThe following cookbook fragment shows how to use the [and][0m
       [40mfunction in conditional recipes.[0m
            [40m#if [and [defined change] [defined baseline]][0m
            [4m[40m...do[24m [4msomething...[0m
            [40m#endif[0m
       [40mThis fragment will only [4mdo[24m [4msomething[24m if both the [4mchange[24m and[0m
       [4m[40mbaseline[24m variables are defined.[0m

       [4m[40m8.3.2[24m  [4mCaveat[0m
       [40mThis function is rather clumsy, and probably needs to be[0m
       [40mreplaced by a better syntax within the cokbook grammar[0m
       [40mitself.[0m

       [40mThis function does not short-circuit evaluation.[0m




       
       Peter Miller                                         Page 63





       Cook                                              User Guide



       [40m[4m8.3.3[24m  [4mSee[24m [4mAlso[0m
       [40mor, not[0m

       [4m[40m8.4[24m  [4mbasename[0m

       [40mThe [4mbasename[24m treats each argument as filenames, and extracts[0m
       [40mall but the suffix of each filename.  If the filename[0m
       [40mcontains a period, the basename is everything up to (but not[0m
       [40mincluding) the period.  Otherwise, the basename is the[0m
       [40mentire filename.[0m

       [40mPlease note: this is not the same behavior as the Unix[0m
       [4m[40mbasename[24m(1) utility.  For this, [basename [notdir [4margs[24m]] or[0m
       [40m[fromto %0%.c %0% [4margs[24m] may be more appropriate.[0m

       [4m[40m8.4.1[24m  [4mExample[0m

                   [40mExpression               Result[0m
                   [40m-------------------------------------[0m
                   [40m[basename foo.c]         foo[0m
                   [40m[basename foo/bar.c]     foo/bar[0m
                   [40m[basename baz]           baz[0m
                   [40m[basename foo/bar/baz]   foo/bar/baz[0m

       [4m[40m8.4.2[24m  [4mSee[24m [4mAlso[0m
       [40maddsuffix, dirname, entryname, fromto, notdir, suffix[0m

       [4m[40m8.4.3[24m  [4mCaveat[0m
       [40mThis function is almost nothing like the Unix command of the[0m
       [40msame name.  It operates in this manner for compatibility[0m
       [40mwith other packages.[0m

       [4m[40m8.5[24m  [4mcando[0m

       [40mThis function is used to test whether Cook knows how to cook[0m
       [40mthe given targets.  It returns all of the arguments for[0m
       [40mwhich derivations can be found, or nothing if none can.[0m

       [4m[40m8.5.1[24m  [4mCaveat[0m
       [40mThis will use as much of the cookbook as has been read in up[0m
       [40mto the point where this function is used.  This can mean[0m
       [40mthat crucial recipes have yet to be parsed and instantiated.[0m

       [4m[40m8.5.2[24m  [4mSee[24m [4mAlso[0m
       [40mcook, uptodate[0m










       
       Peter Miller                                         Page 64





       Cook                                              User Guide



       [40m[4m8.6[24m  [4mcatenate[0m

       [40mThis function requires zero or more arguments.  If no[0m
       [40marguments are supplied, the result is an empty word list.[0m
       [40mIf one or more arguments are supplied, the result is a word[0m
       [40mlist of one word being the catenation of all of the[0m
       [40marguments.[0m

       [4m[40m8.6.1[24m  [4mExample[0m

                       [40mExpression           Result[0m
                       [40m----------------------------[0m
                       [40m[catenate a]         a[0m
                       [40m[catenate a b]       ab[0m
                       [40m[catenate a " " b]   "a b"[0m
       [40mQuotes used in the results for clarity.[0m

       [4m[40m8.6.2[24m  [4mSee[24m [4mAlso[0m
       [40msplit, unsplit, prepost, join[0m

       [4m[40m8.7[24m  [4mcollect_lines[0m

       [40mThe arguments are interpreted as a command to be passed to[0m
       [40mthe operating system.  The result is one "word" for each[0m
       [40mline of the output of the command.[0m

       [4m[40m8.7.1[24m  [4mExample[0m
       [40mTo read each line of a file into a variable:[0m
            [40mfiles = [collect_lines cat file];[0m
       [40mSpaces and tabs in the input lines will be preserved in the[0m
       [40m"words" of the result.[0m

       [4m[40m8.7.2[24m  [4mSee[24m [4mAlso[0m
       [40mcollect, glob[0m

       [4m[40m8.7.3[24m  [4mCaveat[0m
       [40mYou will probably get better performance using the #include-[0m
       [40mcooked directive, and a recipe to create the included file.[0m

















       
       Peter Miller                                         Page 65





       Cook                                              User Guide



       [40m[4m8.8[24m  [4mcollect[0m

       [40mThe arguments are interpreted as a command to be passed to[0m
       [40mthe operating system.  The result is one word for each[0m
       [40mwhite-space separated word of the output of the command.[0m

       [40mThe command will not be echoed unless the -No_Silent option[0m
       [40mis specified on the command line.[0m

       [4m[40m8.8.1[24m  [4mExample[0m
       [40mRead the date and time and assign it to a variable:[0m
            [40mnow = [collect date];[0m
       [40mDo not use the collect function to expand a filename[0m
       [40mwildcard, used the [glob] function instead.[0m

       [4m[40m8.8.2[24m  [4mSee[24m [4mAlso[0m
       [40mcollect_lines, execute, glob[0m

       [4m[40m8.8.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mshell[0m

       [4m[40m8.9[24m  [4mcook[0m

       [40mThis function requires one or more arguments, filenames to[0m
       [40mbe tested to see if they are up-to-date, and be brought up-[0m
       [40mto-date if they are not.  The result are true ("1") if the[0m
       [40mfiles are (now) up-to-date, or false ("") if they could not[0m
       [40mbe built.[0m

       [4m[40m8.9.1[24m  [4mCaveat[0m
       [40mThis will use as much of the cookbook as has been read in up[0m
       [40mto the point where this function is used.  This can mean[0m
       [40mthat crucial recipes have yet to be parsed and instantiated.[0m

       [40mThis function works one argument at a time.  This is slower[0m
       [40mthan the main cookbook, which will pursue all targets[0m
       [40msimultaneously.[0m

       [4m[40m8.9.2[24m  [4mSee[24m [4mAlso[0m
       [40mcando, uptodate[0m















       
       Peter Miller                                         Page 66





       Cook                                              User Guide



       [40m[4m8.10[24m  [4mcount[0m

       [40mThis function requires zero or more arguments.  The result[0m
       [40mis a word list of one word containing the (decimal) length[0m
       [40mof the argument word list.[0m

       [4m[40m8.10.1[24m  [4mExample[0m
       [40mThis cookbook fragment echoes the number of files, and then[0m
       [40mthe name of the last file:[0m
            [40mecho There are [count [files]] files.;[0m
            [40mecho The last file is [word [count [files]] [files]].;[0m

       [4m[40m8.10.2[24m  [4mSee[24m [4mAlso[0m
       [40mhead, tail, word[0m

       [4m[40m8.10.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mwords[0m

       [4m[40m8.11[24m  [4mdefined[0m

       [40mThis function requires a single argument, the name of a[0m
       [40mvariable to be tested for existence.  It returns "1" (true)[0m
       [40mif the named variable is defined and "" (false) if it is[0m
       [40mnot.[0m

       [4m[40m8.11.1[24m  [4mExample[0m
       [40mThis function is most often seen in conditional portions of[0m
       [40mcookbooks:[0m
            [40mif [defined baseline] then[0m
                    [40mcc_flags = [cc_flags] -I[baseline];[0m

       [4m[40m8.12[24m  [4mdirname[0m

       [40mThis function requires one or more arguments, the names of[0m
       [40mfiles which will have their directory parts extracted.[0m

       [4m[40m8.12.1[24m  [4mExample[0m

                         [40mExpression        Result[0m
                         [40m-------------------------[0m
                         [40m[dirname a]       [4m`pwd`[0m
                         [40m[dirname a/b]     a[0m
                         [40m[dirname a/b/c]   a/b[0m
       [40mWhen the answer would be ``.'' (the current directory), the[0m
       [40mresult is instead the absolute path of the current[0m
       [40mdirectory.  This allows repeated [dirname] applications to[0m
       [40mclimb the directory tree, no matter where you start.  See[0m
       [4m[40mrelative_dirname[24m for one which returns ``.'' instead.[0m

       [4m[40m8.12.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, entryname, notdir, pathname, relative_dirname,[0m
       [40msuffix[0m



       
       Peter Miller                                         Page 67





       Cook                                              User Guide



       [40m[4m8.12.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mdir[0m

       [4m[40m8.13[24m  [4mdir[0m

       [40mThis function requires one or more arguments, the names of[0m
       [40mfiles which will have their directory parts extracted.[0m

       [4m[40m8.13.1[24m  [4mExample[0m

                           [40mExpression    Result[0m
                           [40m---------------------[0m
                           [40m[dir a]       .[0m
                           [40m[dir a/b]     a[0m
                           [40m[dir a/b/c]   a/b[0m

       [4m[40m8.13.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, entryname, notdir, pathname, relative_dirname,[0m
       [40msuffix[0m

       [4m[40m8.13.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mdirname[0m

       [4m[40m8.14[24m  [4mdos-path[0m

       [40mThis function requires one or more arguments, which will be[0m
       [40mconverted from a UNIX path into a DOS path.  This is of most[0m
       [40muse under Windows-NT, to convert Cook's internal pathnames[0m
       [40minto DOS pathnames.  (The UNIX porting layer usually hides[0m
       [40mthis from Cook.)[0m

       [4m[40m8.14.1[24m  [4mExample[0m

                [40mExpression                  Result[0m
                [40m-------------------------------------------[0m
                [40m[dos-path a/b/c]            a\b\c[0m
                [40m[dos-path //c/temp]         c:\temp[0m
                [40m[dos-path //server/stuff]   \\server\stuff[0m

       [4m[40m8.14.2[24m  [4mSee[24m [4mAlso[0m
       [40mun-dos-path[0m














       
       Peter Miller                                         Page 68





       Cook                                              User Guide



       [40m[4m8.15[24m  [4mdowncase[0m

       [40mThis function requires one or more arguments, words to be[0m
       [40mforced into lower case.[0m

       [4m[40m8.15.1[24m  [4mExample[0m

                         [40mExpression       Result[0m
                         [40m------------------------[0m
                         [40m[downcase FOO]   foo[0m
                         [40m[downcase Bar]   bar[0m
                         [40m[downcase baz]   baz[0m

       [4m[40m8.15.2[24m  [4mSee[24m [4mAlso[0m
       [40mupcase[0m

       [4m[40m8.16[24m  [4mentryname[0m

       [40mThis function requires one or more arguments, the names of[0m
       [40mfiles which will have their entry name parts extracted.[0m

       [4m[40m8.16.1[24m  [4mExample[0m

                      [40mExpression              Result[0m
                      [40m-------------------------------[0m
                      [40m[entryname foo.c]       foo.c[0m
                      [40m[entryname foo/bar.c]   bar.c[0m
                      [40m[entryname baz]         baz[0m

       [4m[40m8.16.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, dir, suffix[0m

       [4m[40m8.16.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mnotdir[0m

       [4m[40m8.17[24m  [4mexecute[0m

       [40mThis function requires at least one argument, and executes[0m
       [40mthe command given by the arguments.  If the executed command[0m
       [40mreturns non-zero exit status the resulting value is ""[0m
       [40m(false), otherwise it is "1" (true).[0m

       [40mThe command will not be echoed unless the -No_Silent option[0m
       [40mis specified on the command line.[0m

       [4m[40m8.17.1[24m  [4mCaveat[0m
       [40mThis function is not often required as its functionality is[0m
       [40mavailable in a more useful form as recipe bodies.[0m

       [4m[40m8.17.2[24m  [4mSee[24m [4mAlso[0m
       [40mcollect[0m




       
       Peter Miller                                         Page 69





       Cook                                              User Guide



       [40m[4m8.18[24m  [4mexists[0m

       [40mThis function requires one argument, being the name of a[0m
       [40mfile to test for existence.  The resulting word list is ""[0m
       [40m(false) if the file does not exist, and "1" (true) if the[0m
       [40mfile does exist.[0m

       [4m[40m8.18.1[24m  [4mExample[0m
       [40mTo remove the target of a recipe before building it again:[0m
            [40m%.a: [%_obj][0m
            [40m{[0m
                    [40mif [exists [target]] then[0m
                            [40mrm [target][0m
                                    [40mset clearstat;[0m
                    [40m[ar] qc [target] [%_obj];[0m
            [40m}[0m
       [40mNote: you [4mmust[24m use the clearstat, because otherwise cook's[0m
       [40m"stat cache" will be incorrect.[0m

       [40mThis is only an example.  It is better to perform this[0m
       [40mparticular activity using the ``unlink'' flag.  See the[0m
       [40m[find_command] function, below, for an example.[0m

       [4m[40m8.18.2[24m  [4mSee[24m [4mAlso[0m
       [40mcando, find_command, uptodate[0m

       [4m[40m8.19[24m  [4mexists-symlink[0m

       [40mThis function requires one argument, being the name of a[0m
       [40mfile to test for existence.  The test will [4mnot[24m follow[0m
       [40msymbolic links, so it may be used to test for the existence[0m
       [40mof symbolic links themselves.  The resulting word list is ""[0m
       [40m(false) if the file does not exist, and "1" (true) if the[0m
       [40mfile does exist.[0m

       [4m[40m8.19.1[24m  [4mSee[24m [4mAlso[0m
       [40mexists, readlink[0m


















       
       Peter Miller                                         Page 70





       Cook                                              User Guide



       [40m[4m8.20[24m  [4mexpr[0m

       [40mThis function may be used to calculate simple integer[0m
       [40marithmetic expressions.  The numbers and the operators are[0m
       [40mexpected to each be a separate argument.  The result is a[0m
       [40mstring containing the value of the evaluated expression.[0m

       [4m[40m8.20.1[24m  [4mOperators[0m
       [40mThe following operators are understood.  They have the same[0m
       [40mprecedence as the equivalent C operators.[0m

                        [40mOperator    Associativity[0m
                        [40m--------------------------[0m
                        [40m( )              ->[0m
                        [40m! ~ -            <-[0m
                        [40m* / %            ->[0m
                        [40m+ -              ->[0m
                        [40m<< >>            ->[0m
                        [40m< <= > >=        ->[0m
                        [40m== !=            ->[0m
                        [40m&                ->[0m
                        [40m^                ->[0m
                        [40m|                ->[0m
                        [40m&&               ->[0m
                        [40m||               ->[0m
                        [40m?:               <-[0m
       [40mPlease note that there is no short-circuit evaluation of the[0m
       [40m?: or && or || operators.[0m

       [40mYou may need to quote some of the operators, to insulate[0m
       [40mthem from their usual Cook interpretation (colon and equals[0m
       [40mcharacters in particular).[0m

       [40mNumbers may be given in decimal, octal (with a 0 prefix), or[0m
       [40mhexadecimal (with a 0x prefix).  The result is always[0m
       [40mdecimal.[0m

       [4m[40m8.20.2[24m  [4mSee[24m [4mAlso[0m
       [40mcount[0m
















       
       Peter Miller                                         Page 71





       Cook                                              User Guide



       [40m[4m8.21[24m  [4mfilter_out[0m

       [40mThis function requires one or more arguments.  The first[0m
       [40margument is a pattern, the second and later arguments are[0m
       [40mstrings to match against this pattern.  The resulting[0m
       [40mwordlist contains those arguments which did not match the[0m
       [40mpattern given as the first argument.[0m

       [4m[40m8.21.1[24m  [4mExample[0m

                   [40mExpression                  Result[0m
                   [40m------------------------------------[0m
                   [40m[filter_out %.c a.c a.o]    a.o[0m
                   [40m[filter_out %.cc a.c a.o]   a.c a.o[0m

       [4m[40m8.21.2[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m

       [4m[40m8.21.3[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, stringset[0m

       [4m[40m8.22[24m  [4mfilter[0m

       [40mThis function requires one or more arguments.  The first[0m
       [40margument is a pattern, the second and later arguments are[0m
       [40mstrings to match against this pattern.  The resulting[0m
       [40mwordlist contains those arguments which matched the pattern[0m
       [40mgiven as the first argument.[0m

       [4m[40m8.22.1[24m  [4mExample[0m

                      [40mExpression              Result[0m
                      [40m-------------------------------[0m
                      [40m[filter %.c a.c a.o]    a.c[0m
                      [40m[filter %.cc a.c a.o][0m

       [4m[40m8.22.2[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m

       [4m[40m8.22.3[24m  [4mSee[24m [4mAlso[0m
       [40mfilter_out, stringset[0m

       [4m[40m8.22.4[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mmatch_mask[0m









       
       Peter Miller                                         Page 72





       Cook                                              User Guide



       [40m[4m8.23[24m  [4mfind_command[0m

       [40mThis function requires at least one argument, being the[0m
       [40mnames of commands to search for in $PATH.  The resulting[0m
       [40mword list contains either "" (false) or a fully qualified[0m
       [40mpath name for each command given.[0m

       [4m[40m8.23.1[24m  [4mExample[0m
       [40mSome systems require [4mranlib[24m(1) to be run on archives, and[0m
       [40msome do not.  Here is a simple way to test:[0m
            [40mranlib = [find_command ranlib];[0m

            [40m%.a: [%_obj][0m
                    [40mset unlink[0m
            [40m{[0m
                    [40mar qc [target] [%_obj];[0m
                    [40mif [ranlib] then[0m
                            [40m[ranlib] [target];[0m
            [40m}[0m

       [4m[40m8.23.2[24m  [4mSee[24m [4mAlso[0m
       [40mcando, exists, uptodate[0m

       [4m[40m8.24[24m  [4mfindstring[0m

       [40mThe findstring function is used to match a fixed string[0m
       [40magainst a set of strings.  This function takes at least one[0m
       [40margument.  The first argument is the fixed string, the[0m
       [40msecond and subsequent arguments are matched against the[0m
       [40mfirst.  The result contains one word for each of the second[0m
       [40mand subsequent arguments, each will either be the empty[0m
       [40mstring (false) or the string to be matched, if a match was[0m
       [40mfound.[0m

       [4m[40m8.24.1[24m  [4mExample[0m

                      [40mExpression             Result[0m
                      [40m-------------------------------[0m
                      [40m[findstring a a b c]   a "" ""[0m
                      [40m[findstring a b c]     "" ""[0m
       [40mQuotes are for clarity, to emphasize the empty strings.[0m
       [40mBecause the empty string is "false", this can be used in an[0m
       [4m[40mif[24m statement:[0m
            [40mif [findstring fish [sources]] then[0m
                    [40msources = [sources] hook.c;[0m

       [4m[40m8.24.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter-out, match, match_mask, patsubst, stringset, subst[0m







       
       Peter Miller                                         Page 73





       Cook                                              User Guide



       [40m[4m8.25[24m  [4mfirstword[0m

       [40mThis function requires zero or more arguments.  The wordlist[0m
       [40mreturned is empty if there were no arguments, or the first[0m
       [40margument if there were arguments.[0m

       [4m[40m8.25.1[24m  [4mExample[0m
       [40mYou can iterate along a list using the [4mloop[24m statement[0m
       [40mcombined with the [4mfirstword[24m and [4mtail[24m functions:[0m
            [40mdirs = a b c d;[0m
            [40msrc = ;[0m

            [40mtmp = [dirs];[0m
            [40mloop[0m
            [40m{[0m
                    [40mtmp_dir = [firstword [tmp]];[0m
                    [40mif [not [tmp_dir]] then[0m
                            [40mloopstop;[0m
                    [40mtmp = [tail [tmp]];[0m
                    [40msrc = [src] [glob [tmp_dir]"/*.c"];[0m
            [40m}[0m
       [40mMore efficient ways exist to do this, this an example only.[0m

       [4m[40m8.25.2[24m  [4mSee[24m [4mAlso[0m
       [40mcount, glob, fromto, prepost, tail, word[0m

       [4m[40m8.25.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mhead[0m

       [4m[40m8.26[24m  [4mfromto[0m

       [40mThis function requires at least two arguments.  Fromto gives[0m
       [40mthe user access to the pattern transformations available to[0m
       [1m[40mcook[22m.  The first argument is the "from" form, the second[0m
       [40margument is the "to" form.  All other arguments are mapped[0m
       [40mfrom one to the other.[0m

       [4m[40m8.26.1[24m  [4mExample[0m
       [40mGiven a list of C source files, generate a list of object[0m
       [40mfiles as follows:[0m
            [40mobj = [fromto %.c %.o [src]];[0m

       [4m[40m8.26.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, subst[0m

       [40mSee the pattern matching chapter for more information about[0m
       [40mpatterns.[0m

       [4m[40m8.26.3[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m




       
       Peter Miller                                         Page 74





       Cook                                              User Guide



       [40m[4m8.26.4[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mpatsubst[0m

       [4m[40m8.27[24m  [4mgetenv[0m

       [40mEach argument is treated as the name of an environment[0m
       [40mvariable.  The result is the value of each argument[0m
       [40mvariable, or "" if it does not exist (consistent with[0m
       [40mcommand shell behaviour).[0m

       [4m[40m8.27.1[24m  [4mExample[0m
       [40mTo read the value of the TERM environment variable:[0m
            [40mterm = [getenv TERM];[0m

       [40mValues of variables are not automagically set from the[0m
       [40menvironment, you must set each one explicitly:[0m
            [40mcc = [getenv CC];[0m
            [40mif [not [cc]] then[0m
                    [40mcc = gcc;[0m

       [4m[40m8.27.2[24m  [4mSee[24m [4mAlso[0m
       [40mfind_command, home[0m

       [4m[40m8.28[24m  [4mglob[0m

       [40mEach argument is treated as a [4msh[24m(1) file name pattern, and[0m
       [40mexpanded accordingly.  The resulting list of filenames is[0m
       [40msorted lexicographically.[0m

       [40mYou may need to quote the pattern, to protect square[0m
       [40mbrackets from the meaning cook attaches to them.[0m

       [1m[40mNote: [22mThe character sequence /* is a comment introducer, and[0m
       [40mis a frequent source of problems when combined with the [4mglob[0m
       [40mfunction.  Remember to quote [4mglob[24m arguments which need this[0m
       [40mcharacter sequence.  See the [head] function, below, for an[0m
       [40mexample of this.[0m

       [4m[40m8.28.1[24m  [4mExample[0m
       [40mTo find the sources in the current directory:[0m
            [40msrc = [glob *.c];[0m
            [40mobj = [fromto %.c %.o [src]];[0m

       [4m[40m8.28.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, shell[0m

       [4m[40m8.28.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mwildcard[0m







       
       Peter Miller                                         Page 75





       Cook                                              User Guide



       [40m[4m8.29[24m  [4mhead[0m

       [40mThis function requires zero or more arguments.  The wordlist[0m
       [40mreturned is empty if there were no arguments, or the first[0m
       [40margument if there were arguments.[0m

       [4m[40m8.29.1[24m  [4mExample[0m
       [40mYou can iterate along a list using the [4mloop[24m statement[0m
       [40mcombined with the [4mhead[24m and [4mtail[24m functions:[0m
            [40mdirs = a b c d;[0m
            [40msrc = ;[0m

            [40mtmp = [dirs];[0m
            [40mloop[0m
            [40m{[0m
                    [40mtmp_dir = [head [tmp]];[0m
                    [40mif [not [tmp_dir]] then[0m
                            [40mloopstop;[0m
                    [40mtmp = [tail [tmp]];[0m
                    [40msrc = [src] [glob [tmp_dir]"/*.c"];[0m
            [40m}[0m
       [40mMore efficient ways exist to do this, this an example only.[0m

       [4m[40m8.29.2[24m  [4mSee[24m [4mAlso[0m
       [40mcount, glob, fromto, prepost, tail, word[0m

       [4m[40m8.29.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mfirstword[0m

       [4m[40m8.30[24m  [4mhome[0m

       [40mThe [4mhome[24m function is used to find the home directory of the[0m
       [40mnamed users.  You may name more than one user.  If no users[0m
       [40mare named, it returns the home directory of the current[0m
       [40muser.[0m

       [4m[40m8.31[24m  [4mif[0m

       [40mThis function requires one or more arguments, the arguments[0m
       [40mbefore the "then" word are used as a condition.  If the[0m
       [40mcondition is true the words between the "then" word and the[0m
       [40m"else" word are the result, otherwise the words after the[0m
       [40m"else" word are the value.  The "else" clause is optional.[0m
       [40mThere is no way to escape the "then" and "else" words.[0m

       [4m[40m8.31.1[24m  [4mExample[0m
       [40mHere is an example of the ``if'' function.  Please note that[0m
       [40m``if'', ``then'' and ``else'' are reserved words, so you[0m
       [40mneed to quote them before they will be recognised on the[0m
       [40mfunction context.[0m
            [40m%: %_obj[0m
                    [40mset ["if" [defined all_shallow] "then" shallow][0m
            [40m{[0m
                    [40m[cc] -o [target] [%_obj];[0m

       
       Peter Miller                                         Page 76





       Cook                                              User Guide



       [40m     }[0m

       [4m[40m8.31.2[24m  [4mCaveat[0m
       [40mIt is often clearer to use the [4mif[24m [4mstatement[24m than this[0m
       [40mfunction.[0m

       [40mThe recipe flags are evaluated at the same time as the[0m
       [40mrecipe targets.  None of the [target], [targets], [need],[0m
       [40m[younger] variables or pattern matches (%, %1, [4metc[24m) are set[0m
       [40mat this time.[0m

       [4m[40m8.32[24m  [4min[0m

       [40mThis function requires one or more arguments.  The wordlist[0m
       [40mreturned is a single word: the index of the matching word (1[0m
       [40mbased) if the first argument is equal to any of the later[0m
       [40mones; or "" (false) if not.[0m

       [40mThis function can also be used for equality testing, just[0m
       [40muse a single element in the set.[0m

       [40mBecause it returns the index, the return valus can be used[0m
       [40mwith the [4m[word][24m or [4m[words][24m functions.[0m

       [4m[40m8.32.1[24m  [4mExample[0m
       [40mFrequently seen in conditional parts of recipes:[0m
            [40m%: [%_obj][0m
            [40m{[0m
                    [40m[cc] -o [target] [%_obj];[0m
                    [40mif [in [target] [private]] then[0m
                            [40mchmod og-rwx [target];[0m
            [40m}[0m

       [4m[40m8.32.2[24m  [4mSee[24m [4mAlso[0m
       [40mstringset, word, words[0m

       [4m[40m8.33[24m  [4minterior_files[0m

       [40mThis function requires zero arguments.  The result is the[0m
       [40mlist of files which are interior to the dependency graph.[0m
       [40m(Files which are constructed by a recipe.)  This function is[0m
       [40monly meaningful within a recipe body.[0m

       [4m[40m8.33.1[24m  [4mSee[24m [4mAlso[0m
       [40mleaf_files function, graph_interior_file variable,[0m
       [40mgraph_interior_pattern variable[0m









       
       Peter Miller                                         Page 77





       Cook                                              User Guide



       [40m[4m8.34[24m  [4mjoin[0m

       [40mThe [4mjoin[24m function is used to join two sets of strings[0m
       [40mtogether, element by element.  The argument list must[0m
       [40mcontain an even number of arguments, with the first half[0m
       [40mjoined pair-wise with the last half.  There is no marker of[0m
       [40many kind between the lists, so the user needs to ensure they[0m
       [40mare both the same length.[0m

       [4m[40m8.34.1[24m  [4mExample[0m

                         [40mExpression       Result[0m
                         [40m------------------------[0m
                         [40m[join a b c d]   ac bd[0m
                         [40m[join a b]       ab[0m

       [4m[40m8.34.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, catenate, suffix[0m

       [4m[40m8.35[24m  [4mleaf_files[0m

       [40mThis function requires zero arguments.  The result is the[0m
       [40mlist of files which are leaves of the dependency graph.[0m
       [40m(Files which are not constructed by a recipe.)  This[0m
       [40mfunction is only meaningful within a recipe body.[0m

       [4m[40m8.35.1[24m  [4mSee[24m [4mAlso[0m
       [40minterior_files function, graph_leaf_file variable,[0m
       [40mgraph_leaf_pattern variable[0m

       [4m[40m8.36[24m  [4mmatches[0m

       [40mThis function requires one or more arguments.  The first[0m
       [40margument is a pattern, the second and later arguments are[0m
       [40mstrings to match against the pattern.  The resulting[0m
       [40mwordlist contains "" (false) if did not match and the[0m
       [40m1-based list index (true) if it did.[0m

       [40mThe returned list index may be used in combination with the[0m
       [40m[words] function.[0m

       [4m[40m8.36.1[24m  [4mExample[0m
       [40mThis function may be used to test for strings which have a[0m
       [40mparticular form:[0m
            [40mif [matches %1C%2 [version]] then[0m
                    [40mcc_flags = [cc_flags] -DDEBUG[0m
       [40mIf the version contains a Capital-C character, then turn on[0m
       [40mdebugging.[0m

       [4m[40m8.36.2[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m



       
       Peter Miller                                         Page 78





       Cook                                              User Guide



       [40m[4m8.36.3[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter-out, words[0m

       [4m[40m8.37[24m  [4mmatch_mask[0m

       [40mThis function requires one or more arguments.  The first[0m
       [40margument is a pattern, the second and later arguments are[0m
       [40mstrings to match against this pattern.  The resulting[0m
       [40mwordlist contains those arguments which matched the pattern[0m
       [40mgiven as the first argument.[0m

       [4m[40m8.37.1[24m  [4mExample[0m

                    [40mExpression                  Result[0m
                    [40m-----------------------------------[0m
                    [40m[match_mask %.c a.c a.o]    a.c[0m
                    [40m[match_mask %.cc a.c a.o][0m

       [4m[40m8.37.2[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m

       [4m[40m8.37.3[24m  [4mSee[24m [4mAlso[0m
       [40mfilter-out, findstring, stringset[0m

       [4m[40m8.37.4[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mfilter[0m

       [4m[40m8.38[24m  [4mmtime[0m

       [40mThis function requires one argument, the name of a file to[0m
       [40mfetch the last-modified time of.  The resulting wordlist is[0m
       [40m"" (false) is the file does not exist, or a string[0m
       [40mcontaining a (sortable) representation of the date and time[0m
       [40mthe files were last modified.[0m

       [4m[40m8.38.1[24m  [4mSee[24m [4mAlso[0m
       [40mexists, mtime-seconds, sort_newest[0m

       [4m[40m8.39[24m  [4mmtime-seconds[0m

       [40mThis function requires one argument, the name of a file to[0m
       [40mfetch the last-modified time of.  The resulting wordlist is[0m
       [40m"" (false) is the file does not exist, or a string[0m
       [40mcontaining number of seconds since the epoch that the files[0m
       [40mwere last modified.  This is more useful than [mtime] for[0m
       [40mdoing arithmetic on.[0m

       [4m[40m8.39.1[24m  [4mSee[24m [4mAlso[0m
       [40mexists, expr, mtime, sort_newest[0m





       
       Peter Miller                                         Page 79





       Cook                                              User Guide



       [40m[4m8.40[24m  [4mnotdir[0m

       [40mThis function requires one or more arguments, the names of[0m
       [40mfiles which will have their entry name parts extracted.[0m

       [4m[40m8.40.1[24m  [4mExample[0m

                       [40mExpression           Result[0m
                       [40m----------------------------[0m
                       [40m[notdir foo.c]       foo.c[0m
                       [40m[notdir foo/bar.c]   bar.c[0m
                       [40m[notdir baz]         baz[0m

       [4m[40m8.40.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, dirname, relative_dirname, suffix[0m

       [4m[40m8.40.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mentryname[0m

       [4m[40m8.41[24m  [4mnot[0m

       [40mThis function requires zero or more arguments, the value to[0m
       [40mbe logically negated.  It returns "1" (true) if all of the[0m
       [40marguments are "" (false), or there are no arguments; and[0m
       [40mreturns "" (false) otherwise.  This is symmetric with the[0m
       [40mdefinition of true and false for [1mif[22m.[0m

       [4m[40m8.41.1[24m  [4mExample[0m
       [40mThis is often seen in recipes:[0m
            [40m%1/%0%2.o: %1/%0%2.c[0m
                    [40msingle-thread %2.o[0m
            [40m{[0m
                    [40mif [not [exists [dirname [target]]]] then[0m
                            [40mmkdir -p [dirname [target]][0m
                                    [40mset clearstat;[0m
                    [40m[cc] [cc_flags] -I%1 %1/%0%2.c;[0m
                    [40mmv %2.o [target];[0m
            [40m}[0m
       [40mNote that "%0" matches zero or more whole filename portions,[0m
       [40mincluding the trailing slash.  See the chapter on pattern[0m
       [40mmatching for more information.[0m

       [40mThis is an example only.  The ``mkdir'' recipe flag creates[0m
       [40mthe directory more efficiently.[0m

       [4m[40m8.41.2[24m  [4mSee[24m [4mAlso[0m
       [40mand, or[0m








       
       Peter Miller                                         Page 80





       Cook                                              User Guide



       [40m[4m8.42[24m  [4moperating_system[0m

       [40mThis function requires zero or more arguments.  The[0m
       [40mresulting wordlist contains the values of various attributes[0m
       [40mof the operating system, as named in the arguments.  If no[0m
       [40mattributes are named, "system" is assumed.  Below is a list[0m
       [40mof attributes:[0m

       [40mnode      The name of the computer [1mcook [22mis presently running[0m
                 [40mon.[0m

       [40msystem    The name of the operating system [1mcook [22mis presently[0m
                 [40mbeing run under.  For example: if you were running[0m
                 [40mon SunOS 4.1.3, this would return "SunOS".[0m

       [40mrelease   The specific release of operating system, within[0m
                 [40mname, [1mcook [22mis presently being run under.  For[0m
                 [40mexample: if you were running on SunOS 4.1.3, this[0m
                 [40mwould return "4.1.3".[0m

       [40mversion   Version information.  For SunOS 4.1.3, this would[0m
                 [40mreturn the kernel build number, for other systems[0m
                 [40mit is often the kernel patch release number.[0m

       [40mmachine   The name of the hardware [1mcook [22mis presently running[0m
                 [40mon.  For example: If you were running on SunOS[0m
                 [40m4.1.3 this would return "sun4" or similar.[0m

       [40mThis function may be abbreviated to "os".[0m

       [4m[40m8.42.1[24m  [4mExample[0m
       [40mThis function is usually used to determine the architecture[0m
       [40m(either system or machine):[0m
            [40march=[os system]-[os release]-[os machine];[0m
            [40mif [matches SunOS-4.1%1-sun4%2 [arch]] then[0m
                    [40march = sun4;[0m
            [40melse if [matches SunOS-5.%1-sun4%2 [arch]] then[0m
                    [40march = sun5;[0m
            [40melse if [matches SunOS-5.%1-i86pc [arch]] then[0m
                    [40march = sun5pc;[0m
            [40melse if [matches ConvexOS-%1-%2 [arch]] then[0m
                    [40march = convex;[0m
            [40melse[0m
                    [40march = unknown;[0m

       [4m[40m8.42.2[24m  [4mCaveat[0m
       [40mThis function is implemented using the [4muname[24m(2) system call.[0m
       [40mSome systems do not implement this correctly, and therefore[0m
       [40mthis function is less useful than it should be, and needs[0m
       [40mthe pattern match appropach used above.[0m

       [4m[40m8.42.3[24m  [4mSee[24m [4mAlso[0m
       [40mcollect[0m


       
       Peter Miller                                         Page 81





       Cook                                              User Guide



       [40m[4m8.42.4[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mos[0m

       [4m[40m8.43[24m  [4moptions[0m

       [40mThis functions takes no arguments.  The results is a[0m
       [40mcomplete list of [4mcook[24m options, exactly describing the[0m
       [40mcurrent options settings.  This intended for use in[0m
       [40mconstructing recursive [4mcook[24m invocations.[0m

       [40mThe option setting generated are a combination of the[0m
       [40mcommand line options used to invoke [4mcook,[24m the contents of[0m
       [40mthe COOK environment variable, the results of the ``set''[0m
       [40mcommand and the various ``set'' clauses.[0m

       [4m[40m8.43.1[24m  [4mExample[0m
       [40mThe top level cookbook for a recursive project structure can[0m
       [40mbe as follows:[0m
            [40m%:[0m
            [40m{[0m
                    [40mdirlist = [dirname [glob '*/Howto.cook' ]];[0m
                    [40mloop[0m
                    [40m{[0m
                            [40mdir = [head [dirlist]];[0m
                            [40mif [not [dir]] then[0m
                                    [40mloopstop;[0m
                            [40mdirlist = [tail [dirlist]];[0m

                            [40mcd [dir]\; cook [options] %;[0m
                    [40m}[0m
            [40m}[0m

            [40m/*[0m
             [40m* This recipe sets the default.[0m
             [40m* It doesn't actually do anything.[0m
             [40m*/[0m
            [40mall:;[0m
       [40mPlease note the % hiding on the end of the nested [4mcook[0m
       [40mcommand, this is how the target is communicated to the[0m
       [40mnested [1mcook [22minvocation.[0m

       [4m[40m8.43.2[24m  [4mCaveat[0m
       [40mRecursive Cook is not recommended, because it segments the[0m
       [40mdependency graph and forces Cook to walk the graph in[0m
       [40m(potentially) the wrong order.  This introduces a number of[0m
       [40msignificant problems.  A single top-level cookbook is[0m
       [40mrecommended.[0m

       [4m[40m8.43.3[24m  [4mSee[24m [4mAlso[0m
       [40mThe supplied ``recursive'' cookbook does exactly this.  In[0m
       [40morder to use it, you need a [4mHowto.cook[24m file containing the[0m
       [40msingle line[0m
            [40m#include "recursive"[0m


       
       Peter Miller                                         Page 82





       Cook                                              User Guide



       [40m[4m8.44[24m  [4mor[0m

       [40mThis function requires at least two arguments, upon which it[0m
       [40mforms a logical disjunction.  The value returned is "1"[0m
       [40m(true) if any one of the arguments is not "" (false),[0m
       [40motherwise "" (false) is returned.[0m

       [4m[40m8.44.1[24m  [4mSee[24m [4mAlso[0m
       [40mand, not[0m

       [4m[40m8.45[24m  [4mpathname[0m

       [40mThe function requires one or more arguments, being files[0m
       [40mnames to be replaced with their full path names.[0m

       [4m[40m8.45.1[24m  [4mExample[0m
       [40mRelative names are made absolute, and redundant slashes and[0m
       [40mdots are removed:[0m
            [40mpwd = [pathname .];[0m

       [4m[40m8.45.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, dirname, entryname[0m

       [4m[40m8.46[24m  [4mpatsubst[0m

       [40mThis function requires at least two arguments.  Patsubst[0m
       [40mgives the user access to the pattern transformations[0m
       [40mavailable to [1mcook[22m.  The first argument is the "from" form,[0m
       [40mthe second argument is the "to" form.  All other arguments[0m
       [40mare mapped from one to the other.[0m

       [4m[40m8.46.1[24m  [4mExample[0m
       [40mGiven a list of C source files, generate a list of object[0m
       [40mfiles as follows:[0m
            [40mobj = [patsubst %.c %.o [src]];[0m

       [4m[40m8.46.2[24m  [4mMatch[24m [4mMode[0m
       [40mThis function is affected by the selected match mode.  See[0m
       [40mthe [4mFile[24m [4mName[24m [4mPatterns[24m chapter for details.[0m

       [4m[40m8.46.3[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, subst[0m

       [4m[40m8.46.4[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mfromto[0m










       
       Peter Miller                                         Page 83





       Cook                                              User Guide



       [40m[4m8.47[24m  [4mprepost[0m

       [40mThis function must have at least two arguments.  The first[0m
       [40margument is a prefix and the second argument is a suffix.[0m
       [40mThe resulting word list is the third and later arguments[0m
       [40meach given the prefix and suffix as defined by the first and[0m
       [40msecond arguments.[0m

       [4m[40m8.47.1[24m  [4mExample[0m

                [40mExpression               Result[0m
                [40m-------------------------------------------[0m
                [40m[prepost sun4/ .o a b]   sun4/a.o sun4/b.o[0m
                [40m[prepost -I "" . bl]     -I. -Ibl[0m

       [4m[40m8.47.2[24m  [4mSee[24m [4mAlso[0m
       [40maddprefix, addsuffix, patsubst, subst[0m

       [4m[40m8.48[24m  [4mprint[0m

       [40mThe arguments are printed as an informative message.  The[0m
       [40musual output wrapping is performed.  The function returns[0m
       [40mthe empty list as a result.[0m

       [40mThis function is frequently use to debug cookbooks.[0m

       [4m[40m8.49[24m  [4mquote[0m

       [40mEach argument is quoted by double quotes, with shell9[0m
       [40mspecial characters escaped as necessary.[0m

       [4m[40m8.49.1[24m  [4mSee[24m [4mAlso[0m
       [40mcollect, execute[0m

       [4m[40m8.50[24m  [4mreadlink[0m

       [40mThe arguments are assumed to be symbolic links, and their[0m
       [40mvalues are read.  It is a fatal error if the files named are[0m
       [40mnot symbolic links.[0m

       [4m[40m8.50.1[24m  [4mSee[24m [4mAlso[0m
       [40mcollect, exists-symlink[0m










       ____________________

       9. See [4msh[24m (1) and [4mcsh[24m(1) for more information.

       Peter Miller                                         Page 84





       Cook                                              User Guide



       [40m[4m8.51[24m  [4mrelative_dirname[0m

       [40mThis function requires one or more arguments, the names of[0m
       [40mfiles which will have their directory parts extracted.[0m

       [4m[40m8.51.1[24m  [4mExample[0m

                    [40mExpression                 Result[0m
                    [40m----------------------------------[0m
                    [40m[relative_dirname a]       .[0m
                    [40m[relative_dirname a/b]     a[0m
                    [40m[relative_dirname a/b/c]   a/b[0m
       [40mSee [4mdirname[24m if you want to climb the directory tree with[0m
       [40mrepeated applications, [4mrelative_dirname[24m will continue to[0m
       [40mreturn ``.'' once the current directory is reached.[0m

       [4m[40m8.51.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, dirname, entryname, notdir, pathname, suffix[0m

       [4m[40m8.51.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mreldir[0m

       [4m[40m8.52[24m  [4mresolve[0m

       [40mThis builtin function is used to resolve file names when[0m
       [40musing the [4msearch_list[24m variable to locate files.  This[0m
       [40mbuiltin function produces resolved file names as output.[0m
       [40mThis is useful when taking partial copies of a source to[0m
       [40mperform controlled updates.  The targets of recipes are[0m
       [40malways cooked into the current directory.[0m

       [4m[40m8.52.1[24m  [4mExample[0m
       [40mThis function is used in cookbooks which  use the[0m
       [4m[40msearch_list[24m functionality:[0m
            [40msearch_list = . baseline;[0m

            [40m%.o: %.c[0m
            [40m{[0m
                    [40m[cc] [cc_flags] [addprefix -I [search_list]] [resolve %.c];[0m
            [40m}[0m

       [40mThe cookbooks distributed with Cook contain full support for[0m
       [40mthe search_list functionality.  They are a good source of[0m
       [40mexamples of how to write recipes which take this into[0m
       [40maccount.[0m










       
       Peter Miller                                         Page 85





       Cook                                              User Guide



       [40m[4m8.53[24m  [4mshell[0m

       [40mThe arguments are interpreted as a command to be passed to[0m
       [40mthe operating system.  The result is one word for each[0m
       [40mwhite-space separated word of the output of the command.[0m

       [40mThe command will not be echoed unless the -No_Silent option[0m
       [40mis specified on the command line.[0m

       [4m[40m8.53.1[24m  [4mExample[0m
       [40mRead the date and time and assign it to a variable:[0m
            [40mnow = [shell date];[0m
       [40mDo not use the shell function to expand a filename wildcard,[0m
       [40mused the [wildcard] function instead.[0m

       [4m[40m8.53.2[24m  [4mSee[24m [4mAlso[0m
       [40mcollect_lines, execute, wildcard[0m

       [4m[40m8.53.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mcollect[0m

       [4m[40m8.54[24m  [4msort_newest[0m

       [40mThe arguments are sorted by file last-modified time,[0m
       [40myoungest to oldest.  File names are resolved first (see the[0m
       [40mresolve function, below).  Absent files will be sorted to[0m
       [40mthe start of the list.[0m

       [4m[40m8.54.1[24m  [4mExample[0m
       [40mThis function is often used to "shorten the wait" when[0m
       [40mbuilding large project, so that the file you edited most[0m
       [40mrecently is recompiled almost immediately:[0m
            [40msrc = [glob *.c];[0m
            [40mobj = [sort_newest [fromto %.c %.o [src]]];[0m

       [40mThis trick does not always work as expected, and can take[0m
       [40msignificant time for little result.[0m

       [4m[40m8.54.2[24m  [4mSee[24m [4mAlso[0m
       [40mfromto, glob, sort[0m















       
       Peter Miller                                         Page 86





       Cook                                              User Guide



       [40m[4m8.55[24m  [4msort[0m

       [40mThe arguments are sorted lexicographically.[0m

       [1m[40mNote: [22mDuplicates are [4mnot[24m removed.  Use the [4mstringset[0m
       [40mfunction if you want to do this.[0m

       [4m[40m8.55.1[24m  [4mSee[24m [4mAlso[0m
       [40msort_newest, stringset[0m

       [4m[40m8.56[24m  [4msplit[0m

       [40mThe [4msplit[24m function is used to split strings into multiple[0m
       [40mstrings, given the separator.  This function requires at[0m
       [40mleast one argument.  The first argument is the separator[0m
       [40mcharacter, the second and subsequent arguments are to be[0m
       [40mseparated.  The result is the separated strings, each as a[0m
       [40mseparate word.[0m

       [4m[40m8.56.1[24m  [4mExample[0m

                 [40mExpression                  Result[0m
                 [40m----------------------------------------[0m
                 [40m[split ":" "foo:bar:baz"]   foo bar baz[0m
                 [40m[split " " "New York"]      New York[0m
       [40mEach of the words in the result is a separate string.[0m

       [40mThis can be useful in splitting an environment variable into[0m
       [40mseparate words.  For example:[0m
            [40mpath = [split ":" [getenv PATH]];[0m

       [4m[40m8.56.2[24m  [4mSee[24m [4mAlso[0m
       [40munsplit, join, catenate, strip[0m

       [4m[40m8.57[24m  [4mstringset[0m

       [40mLogical operations are performed on sets of strings.  These[0m
       [40minclude conjunction ([1m+[22m) or implicit, disjunction ([1m*[22m) and[0m
       [40mdifference ([1m-[22m).[0m

       [4m[40m8.57.1[24m  [4mExample[0m

                     [40mExpression                Result[0m
                     [40m---------------------------------[0m
                     [40m[stringset a b a]         a b[0m
                     [40m[stringset a b c * a]     a[0m
                     [40m[stringset a b c - a]     b c[0m
                     [40m[stringset a b - c + d]   a b d[0m

       [40mThe can be very useful in constructing lists of source[0m
       [40mfiles:[0m
            [40msrc = [stringset [glob "*.[cyl]" ] - y.tab.c lex.yy.c];[0m



       
       Peter Miller                                         Page 87





       Cook                                              User Guide



       [40m[4m8.57.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, glob, in, patsubst, subst[0m

       [4m[40m8.58[24m  [4mstripdot[0m

       [40mThe [4mstripdot[24m function is used to remove leading ``.\''[0m
       [40mdirectories from each of the path name arguments.[0m

       [4m[40m8.58.1[24m  [4mExample[0m

                       [40mExpression           Result[0m
                       [40m----------------------------[0m
                       [40m[stripdot ./foo.c]    foo.c[0m
                       [40m[stripdot bar.o]     bar.o[0m
                       [40m[stripdot /fubar]    /fubar[0m

       [4m[40m8.58.2[24m  [4mSee[24m [4mAlso[0m
       [40mset stripdot[0m

       [4m[40m8.59[24m  [4mstrip[0m

       [40mThe [4mstrip[24m function is used to remove leading and trailing[0m
       [40mwhite space from words.  Internal sequences of white space[0m
       [40mare replaced by a single space.[0m

       [4m[40m8.59.1[24m  [4mExample[0m

                 [40mExpression                  Result[0m
                 [40m-----------------------------------------[0m
                 [40m[strip " " "foo " " bar"]   "" foo bar[0m
                 [40m[strip " really   big  "]   "really big"[0m
       [40mQuotes are used here for clarity, and are not present in the[0m
       [40minternal representation of strings.[0m

       [4m[40m8.59.2[24m  [4mSee[24m [4mAlso[0m
       [40msplit[0m

       [4m[40m8.60[24m  [4msubstr[0m

       [40mThe [4msubstr[24m function is used to perform substring extracton.[0m
       [40mThe first argument is the starting position in the string,[0m
       [40mstarting from one.  The second argument is the number of[0m
       [40mcharacters to extract.  Thirst and subsequent arguments will[0m
       [40mbe processed to extract sub-strings.[0m

       [4m[40m8.60.1[24m  [4mExample[0m

                      [40mExpression             Result[0m
                      [40m------------------------------[0m
                      [40m[substr 1 1 Peter]     P[0m
                      [40m[substr 3 99 Miller]   ller[0m




       
       Peter Miller                                         Page 88





       Cook                                              User Guide



       [40m[4m8.60.2[24m  [4mSee[24m [4mAlso[0m
       [40msubst, patsubst[0m

       [4m[40m8.61[24m  [4msubst[0m

       [40mThe [4msubst[24m function is used to perform string substitutions[0m
       [40mon its arguments.  This function requires at least two[0m
       [40marguments.  The first argument is the "from" string, the[0m
       [40msecond argument is the "to" string.  All occurreneces of[0m
       [40m"from" are replaced with "to" in the third and subsequent[0m
       [40marguments.[0m

       [4m[40m8.61.1[24m  [4mExample[0m
       [40mThis is a litteral replacement, not a pattern replacement:[0m

            [40mExpression                            Result[0m
            [40m---------------------------------------------------[0m
            [40m[subst buffalo cress water.buffalo]   water.cress[0m
            [40m[subst .c .o test.c]                  test.o[0m
            [40m[subst .c .o stat.cache.c]            stat.oache.o[0m
       [40mNote that last case: it is not selective.[0m

       [4m[40m8.61.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, patsubst[0m

       [4m[40m8.62[24m  [4msuffix[0m

       [40mThe [4msuffix[24m function treats each argument as a filename, and[0m
       [40mextracts the suffix from each.  If the filename contains a[0m
       [40mperiod, the suffix is everything starting with the last[0m
       [40mperiod.  Otherwise, the suffix is the empty string (as[0m
       [40mopposed to nothing at all).[0m

       [4m[40m8.62.1[24m  [4mExample[0m

                     [40mExpression              Result[0m
                     [40m---------------------------------[0m
                     [40m[suffix a.c foo b.y]    .c "" .y[0m
                     [40m[suffix stat.cache.c]   .c[0m
                     [40m[suffix .eric]          ""[0m
       [40mQuotes are used here for clarity, and are not present in the[0m
       [40minternal representation of strings.[0m

       [40mThe [4msuffix[24m functions in this way to allow sensible results[0m
       [40mwhen using the [4mjoin[24m function to re-unite filenames[0m
       [40mdismembered by the [4mbasename[24m and [4msuffix[24m functions.[0m

       [4m[40m8.62.2[24m  [4mSee[24m [4mAlso[0m
       [40mbasename, dirname, entryname, join, patsubst[0m






       
       Peter Miller                                         Page 89





       Cook                                              User Guide



       [40m[4m8.63[24m  [4mtail[0m

       [40mThis function requires zero or more arguments.  The word[0m
       [40mlist returned will be empty if there is less than two[0m
       [40marguments, otherwise it will consist of the second and later[0m
       [40marguments.[0m

       [4m[40m8.63.1[24m  [4mSee[24m [4mAlso[0m
       [40mcount, head, word[0m

       [4m[40m8.64[24m  [4mun-dos-path[0m

       [40mThis function requires one or more arguments, which will be[0m
       [40mconverted from a DOS path into a UNIX path.  This is of most[0m
       [40muse under Windows-NT, to convert DOS pathnames into Cook's[0m
       [40minternal pathnames.  (The UNIX porting layer usually hides[0m
       [40mthis from Cook.)[0m

       [4m[40m8.64.1[24m  [4mExample[0m

              [40mExpression                     Result[0m
              [40m----------------------------------------------[0m
              [40m[un-dos-path a\b\c]            a/b/c[0m
              [40m[un-dos-path c:\temp]          //c/temp[0m
              [40m[un-dos-path \\server\stuff]   //server/stuff[0m

       [4m[40m8.64.2[24m  [4mSee[24m [4mAlso[0m
       [40mdos-path[0m

       [4m[40m8.65[24m  [4munsplit[0m

       [40mThe [4munsplit[24m function is used to glue strings together, using[0m
       [40mthe specified glue.  The first argument is the text to go[0m
       [40mbetween each of the second and subsequent arguments.[0m

       [4m[40m8.65.1[24m  [4mExample[0m

              [40mExpression                    Result[0m
              [40m----------------------------------------------[0m
              [40m[unsplit ":" one two three]   "one:two:three"[0m
              [40m[unsplit " " four five six]   "four five six"[0m
       [40mThe quotes are necessary to isolate characters such as colon[0m
       [40mand space which cook would normally treat differently.[0m

       [4m[40m8.65.2[24m  [4mSee[24m [4mAlso[0m
       [40mcatenate, prepost, split[0m









       
       Peter Miller                                         Page 90





       Cook                                              User Guide



       [40m[4m8.66[24m  [4mupcase[0m

       [40mThis function requires one or more arguments, words to be[0m
       [40mforced into upper case.[0m

       [4m[40m8.66.1[24m  [4mExample[0m

                          [40mExpression     Result[0m
                          [40m----------------------[0m
                          [40m[upcase FOO]   FOO[0m
                          [40m[upcase Bar]   BAR[0m
                          [40m[upcase baz]   BAZ[0m

       [4m[40m8.66.2[24m  [4mSee[24m [4mAlso[0m
       [40mdowncase[0m

       [4m[40m8.67[24m  [4muptodate[0m

       [40mThis function may be used to determine if files are up-to-[0m
       [40mdate.  It returns a word list containing the names of the[0m
       [40mup-to-date files, or empty if none of them are up-to-date.[0m
       [40mThey are [4mnot[24m brought up to date if they are not already.[0m
       [40mThis function requires one or more arguments.[0m

       [4m[40m8.67.1[24m  [4mCaveat[0m
       [40mThis will use as much of the cookbook as has been read in up[0m
       [40mto the point where this function is used.  This can mean[0m
       [40mthat crucial recipes have yet to be parsed and instanciated.[0m

       [4m[40m8.67.2[24m  [4mSee[24m [4mAlso[0m
       [40mcando, cook[0m

       [4m[40m8.68[24m  [4mwildcard[0m

       [40mEach argument is treated as a [4msh[24m(1) file name pattern, and[0m
       [40mexpanded accordingly.  The resulting list of filenames is[0m
       [40msorted lexicographically.[0m

       [40mYou may need to quote the pattern, to protect square[0m
       [40mbrackets from the meaning cook attaches to them.[0m

       [1m[40mNote: [22mThe character sequence /* is a comment introducer, and[0m
       [40mis a frequent source of problems when combined with the[0m
       [4m[40mwildcard[24m function.  Remember to quote [4mwildcard[24m arguments[0m
       [40mwhich need this character sequence.[0m

       [4m[40m8.68.1[24m  [4mExample[0m
       [40mTo find the sources in the current directory:[0m
            [40msrc = [wildcard *.c];[0m
            [40mobj = [patsubst %.c %.o [src]];[0m

       [4m[40m8.68.2[24m  [4mSee[24m [4mAlso[0m
       [40mfilter, filter_out, patsubst[0m


       
       Peter Miller                                         Page 91





       Cook                                              User Guide



       [40m[4m8.68.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mglob[0m

       [4m[40m8.68.4[24m  [4mWordlist[0m
       [40mThis function may be used to extract a list of words from a[0m
       [40mlarger list.  The first argument is the starting position,[0m
       [40mand the second argument is the ending poistion, inclusive.[0m
       [40mThe third and subsequent arguments are the list to be[0m
       [40mextracted from.  Positions are numbered starting from 1.  If[0m
       [40mthe start is bigger than the end, they will be quietly[0m
       [40mswapped.  If the start is bigger than the list, the result[0m
       [40mwill be empty.[0m

       [4m[40m8.68.4.1[24m  [4mExample[0m

                   [40mExpression                   Result[0m
                   [40m-------------------------------------[0m
                   [40m[wordlist 2 3 foo bar baz]   bar baz[0m
                   [40m[wordlist 1 1 foo bar baz]   foo[0m
                   [40m[wordlist 7 3 foo bar baz]   baz[0m

       [40mThere are a number of functions which are similar[0m

                  [40mExpression               Similar to[0m
                  [40m---------------------------------------[0m
                  [40m[wordlist 1 1 [4mlist[24m]      [head [4mlist[24m][0m
                  [40m[wordlist 2 9999 [4mlist[24m]   [tail [4mlist[24m][0m
                  [40m[wordlist [4mN[24m [4mN[24m [4mlist[24m]      [word [4mN[24m [4mlist[24m][0m

       [4m[40m8.68.4.2[24m  [4mSee[24m [4mAlso[0m
       [40mfirstword head, tail, word, words[0m

       [4m[40m8.69[24m  [4mword[0m

       [40mThe [4mword[24m function is used to extract a specific word from a[0m
       [40mlist of words.  The function requires at least one argument.[0m
       [40mThe first argument is the number of the word to extract from[0m
       [40mthe wordlist.  The wordlist is the second and subsequent[0m
       [40marguments.  An empty list will be returned if you ask for an[0m
       [40melement off the end of the list.[0m

       [4m[40m8.69.1[24m  [4mExample[0m

                     [40mExpression               Result[0m
                     [40m--------------------------------[0m
                     [40m[word 1 one two three]   one[0m
                     [40m[word 2 one two three]   two[0m
                     [40m[word 3 one two three]   three[0m
                     [40m[word 5 one two three][0m

       [40mThe last element of a list of words may be extracted as:[0m
            [40mlast = [word [count [list]] [list]];[0m



       
       Peter Miller                                         Page 92





       Cook                                              User Guide



       [40m[4m8.69.2[24m  [4mSee[24m [4mAlso[0m
       [40mcount, head[0m

       [4m[40m8.70[24m  [4mwords[0m

       [40mThis function requires zero or more arguments.  The result[0m
       [40mis a word list of one word containing the (decimal) length[0m
       [40mof the argument word list.[0m

       [4m[40m8.70.1[24m  [4mExample[0m
       [40mThis cookbook fragment echoes the number of files, and then[0m
       [40mthe name of the last file:[0m
            [40mecho There are [words [files]] files.;[0m
            [40mecho The last file is [word [words [files]] [files]].;[0m

       [4m[40m8.70.2[24m  [4mSee[24m [4mAlso[0m
       [40mhead, tail, word[0m

       [4m[40m8.70.3[24m  [4mAlso[24m [4mKnown[24m [4mAs[0m
       [40mcount[0m

       [4m[40m8.71[24m  [4mwrite[0m

       [40mThis function requires one or more arguments.  The first[0m
       [40margument is the name of the file to write, the second an[0m
       [40mlater arguments are lines to be written to the file.  (This[0m
       [40mis specifically a text file.)  The result is an empty word[0m
       [40mlist.[0m

       [40mThis function is very useful in writing command line file[0m
       [40mfor Windows-NT, due to its absurdly short command line[0m
       [40minterface.[0m























       
       Peter Miller                                         Page 93





       Cook                                              User Guide



       [40m[4m9.[24m  [4mPredefined[24m [4mVariables[0m

       [40mA number of variables are defined by [1mcook [22mat run-time.[0m

       [4m[40m9.1[24m  [4marg[0m

       [40mThis is the arguments list for user-defined functions.[0m
       [40mIndividual arguments are split out into ``@1'' to ``@9''.[0m
       [40mThese can also be used at automatic variables.  Caution: [4marg[0m
       [40mand the automatic variables are [4mshared[24m for parallel[0m
       [40mexecution, causing weird interactions if you execute a[0m
       [40mcommand within the function.[0m

       [4m[40m9.2[24m  [4mcommand-line-goals[0m

       [40mThe value of this variable is the goals specified on the[0m
       [40mcommand line, if any.  If none were specified, and the[0m
       [40mdefault goal is in effect, the value will be empty.[0m

       [4m[40m9.3[24m  [4m__FILE__[0m

       [40mThe value of this variable is the logical name of the file[0m
       [40mwhich contains it.  In the case of #include-cooked files,[0m
       [40mthe physical name may be obtained using the [resolve][0m
       [40mfunction.  The logical name may be set using the #line[0m
       [40mdirective.[0m

       [4m[40m9.4[24m  [4m__FUNCTION__[0m

       [40mThe value of this variable is the name of the function which[0m
       [40mexecutes it.  It is not set for the global cookbook scope or[0m
       [40mthe recipe body scope.[0m

       [4m[40m9.5[24m  [4mgraph_leaf_file[0m

       [40mFile names which are listed in this variable could be leaf[0m
       [40mfiles of the dependency graph.  (See also the [4mleaf_files[0m
       [40mfunction, for Cook's idea of the leaf files.)[0m

       [4m[40m9.6[24m  [4mgraph_exterior_file[0m

       [40mFile names which are listed in this variable cannot be[0m
       [40mpresent in any way in the dependency graph.[0m

       [4m[40m9.7[24m  [4mgraph_interior_file[0m

       [40mFile names which are listed in this variable could be[0m
       [40minterior files of the dependency graph.  (See also the[0m
       [4m[40minterior_files[24m function, for Cook's idea of the interior[0m
       [40mfiles.)[0m

       [4m[40m9.8[24m  [4mgraph_leaf_pattern[0m

       [40mFile names which match the patterns in this variable could[0m

       
       Peter Miller                                         Page 94





       Cook                                              User Guide



       [40mbe leaf files of the dependency graph.  (See also the[0m
       [4m[40mleaf_files[24m function, for Cook's idea of the leaf files.)[0m

       [4m[40m9.9[24m  [4mgraph_exterior_pattern[0m

       [40mFile names which match the patterns in this variable cannot[0m
       [40mbe present in any way in the dependency graph.[0m

       [4m[40m9.10[24m  [4mgraph_interior_pattern[0m

       [40mFile names which match the patterns in this variable could[0m
       [40mbe interior files of the dependency graph.  (See also the[0m
       [4m[40minterior_files[24m function, for Cook's idea of the interior[0m
       [40mfiles.)[0m

       [4m[40m9.11[24m  [4m__LINE__[0m

       [40mThe value of this variable is the line number within of the[0m
       [40mfile which contains it.  The line number may be set using[0m
       [40mthe #line directive.[0m

       [4m[40m9.12[24m  [4mneed[0m

       [40mThe ingredients of the recipe currently being cooked.[0m

       [4m[40m9.13[24m  [4mparallel_hosts[0m

       [40mThis variable may be set to indicate a list of hosts to use[0m
       [40mto distribute the execution of recipe bodies.[0m

       [4m[40m9.14[24m  [4mparallel_jobs[0m

       [40mThis variable may be set to the number of parallel execution[0m
       [40mthreads to perform simultaneously.  Defaults to 1 if not[0m
       [40mset.[0m

       [4m[40m9.15[24m  [4mparallel_rsh[0m

       [40mThis variable may be set to the command used to execute[0m
       [40mcommands on remote machines.  Assumes to take argument in[0m
       [40mthe same form as the BSD [4mrsh[24m(1) command.  Defaults to[0m
       [40m``[4mrsh[24m'' if not set.[0m

       [4m[40m9.16[24m  [4msearch_list[0m

       [40mThis variable may be set to a list of directories to be[0m
       [40msearched for targets and ingredients.  This list is[0m
       [40minitially the current directory (.)  and will always have[0m
       [40mthe current directory prepended if it is not present.  This[0m
       [40mis useful when taking partial copies of a source to perform[0m
       [40mcontrolled updates.  Use the [4mresolve[24m built-in function to[0m
       [40mdetermine what file name cook actually found.  The targets[0m
       [40mof recipes are always cooked into the current directory.[0m


       
       Peter Miller                                         Page 95





       Cook                                              User Guide



       [40mThe cookbooks distributed with Cook contain full support for[0m
       [40mthe search_list functionality.  They are a good source of[0m
       [40mexamples of how to write recipes which take this into[0m
       [40maccount.[0m

       [4m[40m9.17[24m  [4mself[0m

       [40mThe name [1mcook [22mwas invoked as, usually "cook".  Be careful[0m
       [40mwhat you call cook, because anything with the string "cook"[0m
       [40min it will be changed, including (but not limited to) file[0m
       [40msuffixes and environment variable names.[0m

       [4m[40m9.18[24m  [4mtarget[0m

       [40mThe target of the recipe currently being cooked, or the[0m
       [40mfirst target if there is more than one.[0m

       [4m[40m9.19[24m  [4mtargets[0m

       [40mThe targets of the recipe currently being cooked.  This[0m
       [40mincludes all targets of the recipe, should there be more[0m
       [40mthan one.[0m

       [4m[40m9.20[24m  [4mthread-id[0m

       [40mThis variable has a unique value for each execution thread,[0m
       [40mfor the lifetime of that thread.  This value may be used to[0m
       [40mconstruct thread-unique variable names, thread-unique[0m
       [40mtemporary file names, or anything else that needs to be[0m
       [40munique to each execution thread.  The thread IDs are re-[0m
       [40mused, and so several threads in sequence may have the same[0m
       [40mthread ID; it is only guaranteed that no other simultaneous[0m
       [40mthread will have the same thread ID.  By re-using thread[0m
       [40mIDs, generated variable names are also re-used, avoiding[0m
       [40mmemory bloat.[0m

       [4m[40m9.21[24m  [4myounger[0m

       [40mThe subset of the ingredients of the recipe currently being[0m
       [40mcooked which are younger than the target.[0m

       [4m[40m9.22[24m  [4mversion[0m

       [40mThe version of [1mcook [22mcurrently executing.[0m











       
       Peter Miller                                         Page 96





       Cook                                              User Guide



       [40m[4m10.[24m  [4mFunctions[24m [4mLibrary[0m

       [40mThere is a file of functions available to you by using a[0m
            [40m#include "functions"[0m
       [40mline in your cookbook.  The file defines a number of useful[0m
       [40mfunctions.[0m

       [40mThe functions in the file also serve as examples of how you[0m
       [40mcan write your own functions.[0m

       [4m[40m10.1[24m  [4mcapitalize[0m

       [40mThe [4mcapitalize[24m function maps all of its arguments into lower[0m
       [40mcase, and then the first letter of each argument is mapped[0m
       [40mto upper case.  Zero, one or more arguments may be given.[0m

       [4m[40m10.2[24m  [4mdefined-or-null[0m

       [40mThe [4mdefined-or-null[24m function may be used to determine if a[0m
       [40mvariable has been set (on the command line, for example) and[0m
       [40mreturn its value if so, otherwise return the empty list.[0m

       [40mThis function should only be given one argument - the name[0m
       [40mof the variable to look for.  Additional arguments will be[0m
       [40mignored.  Too few arguments will produce a complaint about[0m
       [40mthe "" variable being undefined.[0m

       [4m[40m10.3[24m  [4mdefined-or-default[0m

       [40mThe [4mdefined-or-default[24m function may be used to determine if[0m
       [40ma variable has been set (on the command line, for example)[0m
       [40mand return its value if so, otherwise return the given[0m
       [40mdefault value.[0m

       [40mThe first argument is the name of the variable to look for.[0m

       [40mThe second and later arguments (if present) are the default[0m
       [40mvalue to be used if the named variable is not defined.[0m
       [40mOptional.[0m

       [4m[40m10.4[24m  [4mrepeat[0m

       [40mThe [4mrepeat[24m function is used to repeatedly call another[0m
       [40mfunction, once for each of the specified arguments.  The can[0m
       [40mbe useful when dealing with functions which do not[0m
       [40mautomaticly accept argument lists in the form you require.[0m

       [40mThere are many instances where the repeat function call be[0m
       [40mused to elegantly avoid used to the ``loop { loopstop }''[0m
       [40mconstruct.[0m

       [40mThe first argument is the name of the function you want[0m
       [40mcalled.  This function must accept a single argument.[0m


       
       Peter Miller                                         Page 97





       Cook                                              User Guide



       [40mThe second and subsequent arguments are argument values to[0m
       [40mbe passed to the named function, one at a time.[0m

       [40mThe results of the invocations of the function are[0m
       [40maccumulated in the order in which they were calculated.  The[0m
       [40maccumulated results are returned.[0m

       [4m[40m10.5[24m  [4mvariable_by_path[0m

       [40mThe [4mvariable_by_path[24m function is used to extract the union[0m
       [40mof option settings relevant to a particular compilation or[0m
       [40mlink.  By using a variable prefix, this function may be used[0m
       [40mto obtain the setting of a wide variety of options and[0m
       [40mcommands.[0m

       [40mGlobal variables are searched in a no particular order for[0m
       [40mthe necessary information.  All are searched, all found are[0m
       [40mused.[0m

       [40mFor example, the function call [variable_by_path cc_flags[0m
       [40mfoo/bar/baz.c] will hunt for variables with the following[0m
       [40mnames: cc_flags_foo/bar/baz.c and cc_flags_foo/bar and[0m
       [40mcc_flags_foo and cc_flags.  It is expected that the vast[0m
       [40mmajority of these variables will not be set.  Duplicates are[0m
       [40mremoved.[0m






























       
       Peter Miller                                         Page 98





       Cook                                              User Guide



       [40m[4m11.[24m  [4mActions[24m [4mwhen[24m [4mCooking[0m

       [40mThis section describes what [1mcook [22mdoes when you ask it to[0m
       [40mcook something.[0m

       [1m[40mCook [22mperforms the following actions in the order stated.[0m

       [4m[40m11.1[24m  [4mScan[24m [4mthe[24m [4mCOOK[24m [4mEnvironment[24m [4mVariable[0m

       [40mThe [1mCOOK [22menvironment variable is looked for.  If it is[0m
       [40mfound, it is treated as if it consisted of [1mcook [22mcommand line[0m
       [40marguments.  Only the [1m-Help [22moption is illegal.  This could[0m
       [40mresult is very strange behavior if used incorrectly.[0m

       [40mThis feature is supplied to override [1mcook[22m's default with[0m
       [40myour own preferences.[0m

       [4m[40m11.2[24m  [4mScan[24m [4mthe[24m [4mCommand[24m [4mLine[0m

       [40mThe command line is scanned as defined in chapter 3.[0m

       [4m[40m11.3[24m  [4mLocate[24m [4mthe[24m [4mCookbook[0m

       [40mThe current directory is scanned for the cookbook.  Names[0m
       [40mwhich a cookbook may have include[0m

                 [40mhowto.cook    Howto.cook    .howto.cook[0m
                 [40mhow.to.cook   How.to.cook   .how.to.cook[0m
                  [40mcookfile      Cookfile       .cookrc[0m
                  [40mcook.file     Cook.file      .cook.rc[0m
       [40mThe first so named file found in the current directory will[0m
       [40mbe used.  The order of search is not defined.  You are[0m
       [40mstrongly advised to have just [4mone[24m of these name forms in any[0m
       [40mdirectory.  The name [4mHowto.cook[24m is the preferred form.[0m

       [4m[40m11.4[24m  [4mForm[24m [4mthe[24m [4mListing[24m [4mFilename[0m

       [40mThe listing file, if not explicitly named in the environment[0m
       [40mvariable or on the command line, will be the name of the[0m
       [40mcookbook, with any suffix removed and '.list' appended.[0m

       [4m[40m11.5[24m  [4mCreate[24m [4mthe[24m [4mListing[24m [4mfile[0m

       [40mThe listing file is created.  If [1mcook [22mis executing in the[0m
       [40mbackground, or the [1m-NoTTy [22moption has been specified, [4mstdout[0m
       [40mand [4mstderr[24m will be redirected into the listing file.  If[0m
       [1m[40mcook [22mis executing in the foreground, and the [1m-NoTTy [22moption[0m
       [40mhas not been specified, [4mstdout[24m and [4mstderr[24m will be redirected[0m
       [40minto a pipe to a [4mtee[24m(1) command; which will, in turn, copy[0m
       [40mthe output into the named file.[0m

       [40mA heading line with the name of the file and the date, is[0m
       [40mgenerated.[0m


       
       Peter Miller                                         Page 99





       Cook                                              User Guide



       [40m[4m11.6[24m  [4mScan[24m [4mthe[24m [4mCookbook[0m

       [40mWhen [1mcook [22mreads the cookbook it evaluates all of the[0m
       [40mstatements it finds in it.  Usually these statements[0m
       [40minstantiate recipes, although other things are possible.[0m

       [40mRecipes contain statements that are not evaluated[0m
       [40mimmediately, but which are remembered for later execution[0m
       [40mwhen cooking a target.  The meaning of a cookbook is defined[0m
       [40min chapter X.[0m

       [4m[40m11.7[24m  [4mDetermine[24m [4mtargets[24m [4mto[24m [4mcook[0m

       [40mIf no target files are named on the command line, the[0m
       [40mtargets of the first defined explicit or ingredients recipe.[0m
       [40mIt is an error if this is none.[0m

       [4m[40m11.8[24m  [4mCooking[24m [4ma[24m [4mTarget[0m

       [40mA derivation graph is formed using all of the targets given.[0m
       [40mOnce the derivation graph is formed, it will be walked,[0m
       [40mlooking for files which are out of date.[0m

       [40mTo build the derivation graph for a target, each the[0m
       [40mfollowing steps is performed in the order given:[0m

         [40m1.  [1mCook [22mexploits knowledge of the derivation graph that[0m
             [40mthe user may provide to it:[0m

                [40mo If the [4mgraph_exterior_file[24m variable is set, and[0m
                  [40mthe file name is listed in it, the file is not a[0m
                  [40mleaf, and the derivation will backtrack and try[0m
                  [40manother alternative.[0m

                [40mo If the [4mgraph_exterior_pattern[24m variable is set,[0m
                  [40mand the file name matches one of the patterns[0m
                  [40mlisted in it, the file is not a leaf, and the[0m
                  [40mderivation will backtrack and try another[0m
                  [40malternative.[0m

                [40mo If the [4mgraph_leaf_file[24m variable is set, and the[0m
                  [40mfile name is listed in it, the file is a leaf[0m
                  [40mfile of the derivation.  There is no need to[0m
                  [40mattempt to apply any recipes.  It will be an[0m
                  [40merror if the file does not exist.[0m

                [40mo If the [4mgraph_leaf_pattern[24m variable is set, and[0m
                  [40mthe file name matches one of the patterns listed[0m
                  [40min it, the file is a leaf file of the derivation.[0m
                  [40mThere is no need to attempt to apply any recipes.[0m
                  [40mIt will be an error if the file does not exist.[0m
             [40mThese optimizations require an accurate source file[0m
             [40mmanifest, but can result is substantial performance[0m
             [40mimprovements.[0m

       
       Peter Miller                                        Page 100





       Cook                                              User Guide



       [40m  2.  [1mCook [22mscans through the instantiated ingredients[0m
             [40mrecipes in the order they were defined.  All[0m
             [40mingredients recipes with the target in their target[0m
             [40mlist are used.[0m

             [40mIf a recipe is used, then any ingredients also have[0m
             [40mtheir derivation graph constructed.  When walking the[0m
             [40mgraph, if any of the ingredients are younger than the[0m
             [40mtarget, all other explicit or implicit recipes with[0m
             [40mthe same target will be deemed to be out of date.10[0m

         [40m3.  [1mCook [22mthen scans through the instantiated explicit[0m
             [40mrecipes in the order they were defined.  All explicit[0m
             [40mrecipes with the target in their target list are used.[0m

             [40mIf a recipe is a used, the ingredients also have their[0m
             [40mderivation graph constructed.  When walking the graph,[0m
             [40mif any ingredients are out of date or the target does[0m
             [40mnot yet exist (or the "forced" flag is set in the[0m
             [40mrecipe's [4mset[24m clause) the recipe body will be[0m
             [40mperformed.  If a recipe has no ingredients, it will[0m
             [40mnot be performed, unless the target does not yet[0m
             [40mexist, or it is forced.[0m

         [40m4.  If the target was not in the target list of any[0m
             [40mexplicit recipe, [1mcook [22mthen scans the instantiated[0m
             [40mimplicit recipes in the order they were defined, in[0m
             [40mtwo passes.  Implicit recipes which not not have[0m
             [40mpattern elements in the basename of the targets are[0m
             [40mscanned before implicit recipes which do have patterns[0m
             [40min the basename.  Usually this has no significant[0m
             [40meffect, however in heavily heterogeneous builds this[0m
             [40mmethod is often used in constructing the dependency[0m
             [40mfiles, so that all architectures may use the one[0m
             [40mimplicit dependency recipe, rather than stating every[0m
             [40marchitecture explicitly.  Within each pass, the order[0m
             [40mof scan is the order of definition.[0m

             [40mImplicit recipe targets and ingredients may contain a[0m
             [40mwildcard character ([1m%[22m), which is why they are[0m
             [40mimplicit.  When expressions are evaluated into word[0m
             [40mlists in an implicit recipe, any word containing the[0m
             [40mwildcard character ([1m%[22m) will be expanded out by the[0m
             [40mcurrent wildcard expansion.[0m

             [40mIf the target matches a pattern in the targets of an[0m
             [40mimplicit recipe, it is a candidate.  Each ingredient[0m
             [40mof a candidate recipe is recursively cooked.  If any[0m
             [40mingredient cannot be cooked, then the implicit recipe[0m

       ____________________

       10.A  target  which  does  not exist yet is considered to be
          infinitely ancient, and thus everything is  younger  than
          it.

       Peter Miller                                        Page 101





       Cook                                              User Guide



       [40m      is not used.  If all ingredients can be cooked, then[0m
             [40mthe implicit recipe is used.[0m

             [40mIf an implicit recipe is a used, the forced[0m
             [40mingredients also have their derivation graph[0m
             [40mconstructed.  It is an error if a forced ingredient[0m
             [40mcannot be constructed.[0m

             [40mOnly the first implicit recipe to get to this point is[0m
             [40mused.  The scan stops at this point.[0m

         [40m5.  If the target is not the subject of any ingredients or[0m
             [40mexplicit recipe, and no implicit recipes can be[0m
             [40mapplied, then several derivations are attempted, in[0m
             [40mthe order specified:[0m

                [40mo If the [4mgraph_interior_file[24m variable is set, and[0m
                  [40mthe file name is listed in it, the file is a not[0m
                  [40mleaf file of the derivation.  Cook will backtrack[0m
                  [40mand try another alternative.[0m

                [40mo If the [4mgraph_interior_pattern[24m variable is set,[0m
                  [40mand the file name matches one of the patterns[0m
                  [40mlisted in it, the file is a not leaf file of the[0m
                  [40mderivation.  Cook will backtrack and try another[0m
                  [40malternative.[0m

                [40mo If the [4mgraph_leaf_file[24m variable is set, and the[0m
                  [40mfile name is listed in it, the file is a leaf[0m
                  [40mfile of the derivation.  It will be an error if[0m
                  [40mthe file does not exist.[0m

                [40mo If the [4mgraph_leaf_pattern[24m variable is set, and[0m
                  [40mthe file name matches one of the patterns listed[0m
                  [40min it, the file is a leaf file of the derivation.[0m
                  [40mIt will be an error if the file does not exist.[0m

                [40mo If either of the [4mgraph_leaf_file[24m or[0m
                  [4m[40mgraph_leaf_pattern[24m variables are set, then the[0m
                  [40mfile is not a leaf, and the derivation will[0m
                  [40mbacktrack and try another alternative.[0m

                [40mo If the file exists, then it is up to date, and[0m
                  [40mthe file is a leaf file of the derivation.[0m

                [40mo If the file does not exist then [1mCook [22mdoesn't know[0m
                  [40mhow, and the derivation will backtrack and try[0m
                  [40manother alternative.[0m

       [40mIf a command in the body of any recipe fail, [1mcook [22mwill not[0m
       [40mthat body any further, and will not perform the body of any[0m
       [40mrecipe for which the target of the failed actions was an[0m
       [40mingredient, directly or indirectly.[0m


       
       Peter Miller                                        Page 102





       Cook                                              User Guide



       [40m[1mCook [22mwill trap recursive looping of targets.[0m

          [40mo If the file exists, the it is up to date, or[0m

          [40mo If the file does not exist then [1mcook [22mdoesn't know how.[0m

       [4m[40m11.9[24m  [4mThe[24m [4mDependency[24m [4mGraph[0m

       [40mThe above section describes how Cook derives the dependency[0m
       [40mgraph.  Once the dependency graph has been derived, it is[0m
       [40mthen walked.  The next section describes a little about how[0m
       [40mCook walks the dependency graph.[0m

       [40mCook is a simple kind of expert system.  You give it a set[0m
       [40mof of recipes for how to construct things, and a target to[0m
       [40mbe constructed.  The recipes can be decomposed into pair-[0m
       [40mwise ordered dependencies between files.[0m

       [40mCook determines how to build the target by constructing a[0m
       [4m[40mdirected[24m [4macyclic[24m [4mgraph[24m.  The vertexes of this graph are the[0m
       [40mfiles in the system, the edges in this graph are the inter-[0m
       [40mfile dependencies.  The edges of the graph are directed[0m
       [40mbecause the pair-wise dependencies are ordered resulting in[0m
       [40ma [4macyclic[24m graph - things which look like loops are resolved[0m
       [40mby the direction of the edges.[0m

       [40mFor example, if you have a simple cookbook (with the recipe[0m
       [40mbodies omitted for simplicity) like this:[0m
            [40mprogram: one.o two.o;[0m
            [40mone.o: one.c one.h;[0m
            [40mtwo.o: two.c two.h one.h;[0m
       [40mhere is the corresponding directed acyclic graph.[0m
       [40m[0m

                                 [40mprogram[0m
                                 [40m+-    -+[0m


                        [40mone.o             +-two.o[0m
                        [40m|    -+             |    -+[0m
                        [40m+                   +[0m


                   [40mone.c     one.h     two.c     two.h[0m



       [40mThere are several things that can be done with the graph[0m
       [40monce it has been derived:[0m
       [40m* It can be walked to verify and regenerate the referential[0m
       [40mintegrity of the files (the usual case), or[0m
       [40m* it can walked to print the pair-wise dependencies (the[0m
       [40m-pairs option), or[0m
       [40m* it can be walked to generate a shell script (the -script[0m

       
       Peter Miller                                        Page 103





       Cook                                              User Guide



       [40moption) which does something very similar to the first[0m
       [40moption.[0m

       [4m[40m11.9.1[24m  [4mEdge[24m [4mTypes[0m
       [40mEach of the arrows in the above graph have a specific type.[0m

       [4m[40mstrict[24m edges mean that Cook will decide that a target is[0m
             [40mout-of-date if its time stamp is not strictly younger[0m
             [40mthan all of the ingredients.  This is almost always[0m
             [40mwhat you want.[0m

       [4m[40mweak[24m  edges mean that Cook will decide that a target is out-[0m
             [40mof-date if its time stamp is older than any of the[0m
             [40mingredients.  This means that the times stamps of the[0m
             [40mtarget and ingredients may be equal - this is useful[0m
             [40mfor hard links and symbolic links.  You specify edges[0m
             [40mof this type by appending the ``(weak)'' string to the[0m
             [40mname of the ingredient.[0m

       [4m[40mexists[24m edges mean that Cook will arrange for the ingredient[0m
             [40mto be cooked before the recipe is run, but the time[0m
             [40mstamp [4mis[24m [4mnot[24m [4mconsulted[24m.  The ingredient cannot ever[0m
             [40mmake the target out-of-date.  This is useful form[0m
             [40mcoping with version stamps which change often, but you[0m
             [40mdon't want to re-link unless something else changes.[0m
             [40mYou specify edges of this type by appending the[0m
             [40m``(exists)'' string to the name of the ingredient.[0m
       [40mThe default edge type is ``[4mstrict[24m''.  You can use the "time-[0m
       [40madjust" setting (see the "set" command) to make this simpler[0m
       [40mon very fast machines.[0m

       [4m[40m11.10[24m  [4mFile[24m [4mStatus[0m

       [1m[40mCook [22mdetermines the time a file was last modified by asking[0m
       [40mthe operating system.  Because this operation tends to be[0m
       [40mperformed frequently, [1mcook [22mmaintains a cache of this[0m
       [40minformation, rather than make redundant calls to the[0m
       [40moperating system.  Because this information is cached, it is[0m
       [40mpossible for [1mcook[22m's memory of a file's last-modified time to[0m
       [40mbecome inconsistent with the file's actual last-modified[0m
       [40mtime.  In particular, [1mcook [22mdoe [4mnot[24m ask the operating system[0m
       [40mfor the "new" last-modified time of a recipe target once a[0m
       [40mrecipe body is completed.  Careful use of the set clearstat[0m
       [40mclause will generally prevent this.  For example, the[0m
       [40mfollowing recipe needs to create a directory when writing[0m
       [40mits output:[0m
            [40mbin/%: [%_obj][0m
            [40m{[0m
                    [40mif [not [exists bin]] then[0m
                            [40mmkdir bin;[0m
                    [40m[cc] -o [target] [need];[0m
            [40m}[0m
       [40mIf there were several programs being cooked, e.g. [4mbin/foo[0m
       [40mand [4mbin/bar[24m, the second time [1mcook [22mperformed the recipe, it[0m

       
       Peter Miller                                        Page 104





       Cook                                              User Guide



       [40mwould erroneously attempt to make the [4mbin[24m directory a second[0m
       [40mtime - contrary to the test.  This is because [4m[exists[24m [4mbin][0m
       [40mused the cache, and nothing tells [1mcook [22mthat the cache is now[0m
       [40mwrong.  The recipe should have been written[0m
            [40mbin/%: [%_obj][0m
            [40m{[0m
                    [40mif [not [exists bin]] then[0m
                            [40mmkdir bin[0m
                                    [40mset clearstat;[0m
                    [40m[cc] -o [target] [need];[0m
            [40m}[0m
       [40mwhich tells [1mcook [22mthat it should remove any files named in[0m
       [40mthe [4mmkdir[24m command from the cache.[0m

       [40mAn alternative way of performing the above example is to set[0m
       [40mthe [4mmkdir[24m recipe flag:[0m
            [40mbin/%: [%_obj][0m
                    [40mset mkdir[0m
            [40m{[0m
                    [40m[cc] -o [target] [need];[0m
            [40m}[0m
       [40mThis flag instructs [1mcook [22mto create the directory for the[0m
       [40mtarget before running the recipe body.  There is a similar[0m
       [4m[40munlink[24m flag, which unlinks the targets of the recipe before[0m
       [40mrunning the recipe body.  These two flags take care of most,[0m
       [40mbut not all, uses of the [4mclearstat[24m flag.[0m

       [40mA second mechanism used by [1mcook [22mto determine the last-[0m
       [40mmodified times of files is a file [4mfingerprint[24m.  This is a[0m
       [40mcryptographically strong hash of the contents of a file.[0m
       [40mThe chances of two different files having the same[0m
       [40mfingerprint is less than 1 in 2**200.  If [1mcook [22mnotices that[0m
       [40ma file has changed, because its last-modified time has[0m
       [40mchanged, a fingerprint is taken of the file and compared[0m
       [40mwith the remembered fingerprint.  If the fingerprints[0m
       [40mdiffer, the file is considered to be different.  If the[0m
       [40mfingerprints match, the file is considered not to have[0m
       [40mchanged.[0m

       [40mThis description of fingerprints is somewhat simplified, the[0m
       [40mactual mechanics depends on remembering two different last-[0m
       [40mmodified times, as well as the fingerprint, in a file called[0m
       [4m[40m.cook.fp[24m in the current directory.[0m

       [40mFingerprinting can cause some surprises.  For example, when[0m
       [40myou use the [4mtouch[24m(1) command, [1mcook [22mwill often fail to do[0m
       [40manything, and report instead that everything is up-to-date.[0m
       [40mThis is because the fingerprint has not changed.  In this[0m
       [40msituation, either remove the [4m.cook.fp[24m file, or use the[0m
       [1m[40m-No_FingerPrint [22mcommand line option.[0m





       
       Peter Miller                                        Page 105





       Cook                                              User Guide



       [40m[4m12.[24m  [4mOption[24m [4mPrecedence[0m

       [40mAt various points in the description there are a number of[0m
       [40mflags and options with the same, or similar, names.  These[0m
       [40mare in fact different levels of the same option.[0m

       [40mThe different levels, from highest precedence to lowest, are[0m
       [40mas follows.[0m

       [40mError     This level is used to disable undesirable side[0m
                 [40meffects when an error occurs.[0m

       [40mCommand Line Options specified on the command line override[0m
                 [40malmost everything.  There are some isolated cases[0m
                 [40mwhere there is no equivalent command line option.[0m
                 [40mThey are in scope for the entire [1mcook [22msession.[0m

       [40mExecute   When a command attached to a recipe is executed,[0m
                 [40mthe flags in the '[1mset[22m' clause are given this[0m
                 [40mprecedence.  They are in scope for the duration of[0m
                 [40mthe execution of the command they are bound to.[0m

       [40mRecipe    When a recipe is considered for use, the flags in[0m
                 [40mthe '[1mset[22m' clause are given the precedence.  They[0m
                 [40mare in scope for the evaluation of the ingredients[0m
                 [40mnames and the execution of the recipe body; they[0m
                 [40mare not in scope while cooking the ingredients.[0m

       [40mCookbook  When a '[1mset[22m' statement is encountered in the[0m
                 [40mcookbook, the option are given this priority.[0m
                 [40mThey are in scope until the end of the [1mcook[0m
                 [40msession.[0m

       [40mEnvironment Variable[0m
                 [40mWhen the  options in the [1mCOOK [22menvironment variable[0m
                 [40mare set, they are given this precedence.  They are[0m
                 [40min scope for the entire [1mcook [22msession.[0m

       [40mDefault   All options have a default setting.  The defaults[0m
                 [40mnoted in chapter 3 are given this precedence.[0m
                 [40mThey are in scope for the entire [1mcook [22msession.[0m














       
       Peter Miller                                        Page 106





       Cook                                              User Guide



       [40m[4m13.[24m  [4mFile[24m [4mname[24m [4mpatterns[0m

       [40mThere are two pattern matchers to choose from.[0m

       [40mThe tough part about designing a pattern matcher for[0m
       [40msomething like Cook is that [4mideally[24m the patterns must be[0m
       [40mreversible.  That is, it must be possible to use the same[0m
       [40mstring both as a pattern to be matched against and as a[0m
       [40mtemplate for building a string once a pattern has matched.[0m
       [40mRather like the difference between the left and right sides[0m
       [40mof an editor search-and-replace command in an editor using[0m
       [40mthe same description for both the search pattern and the[0m
       [40mreplace template.  This is why classic regular expressions[0m
       [40mare not the default.[0m

       [40mThe choice of which pattern matcher to use is dictated by[0m
       [40mflag settings:[0m

       [40mset match-mode-cook[0m
            [40mThis causes patterns to be matched using Cook's native[0m
            [40mpatterns.  This is the default.[0m

       [40mset match-mode-regex[0m
            [40mThis causes patterns to be matched using regular[0m
            [40mexpressions.[0m

       [40mThe match mode to use may be set at the cookbook level[0m
            [40mset match-mode-cook;[0m
       [40mor at the recipe level[0m
            [40m%.o: %.c[0m
                    [40mset match-mode-cook[0m
            [40m{[0m
                    [40m[cc] -o %.o -c %.c;[0m
            [40m}[0m
       [40mif you want to change your mind temporarily.[0m

       [40mThe match mode also affects match functions, such as [4mfilter[24m,[0m
       [4m[40mfilter_out[24m, [4mfromto[24m, [4mmatch_mask[24m, [4mmatches[24m and [4mpatsubst[24m.  If[0m
       [40myou use these in your user-defined functions, you need to be[0m
       [40mextra careful about this.[0m

       [40mThe match mode also affects the graph variables, used to[0m
       [40mspecify explicit graph interior and leaf files.[0m

       [4m[40m13.1[24m  [4mCook[24m [4mPatterns[0m

       [40mThe native Cook pattern matcher has symmetric left-hand-side[0m
       [40mand right-hand-side patterns.  This is best demonstrated[0m
       [40mwith an example recipe:[0m
            [40m%.c %.h: %.y[0m
                    [40mset match-mode-cook[0m
            [40m{[0m
                    [40myacc -d %.y;[0m
                    [40mmv yy.tab.c %.c;[0m

       
       Peter Miller                                        Page 107





       Cook                                              User Guide



       [40m             mv yy.tab.h %.h;[0m
            [40m}[0m
       [40mNotice how the left-hand-side of the recipe (the targets)[0m
       [40muses the same style of patterns as the right-hand-side (the[0m
       [40mingredients and the recipe body).[0m

       [40mThis matcher has eleven match "fields", referenced as [1m% [22mand[0m
       [1m[40m%0 [22mto [1m%9[22m.  The [1m% [22mcharacter can be escaped as [1m%%[22m.  The [1m% [22mand[0m
       [1m[40m%1 [22mto [1m%9 [22mforms match any character except slash ([1m/[22m); these[0m
       [40mforms may not match a leading empty string, to avoid[0m
       [40mproblems with false matches against absolute paths.  The [1m%0[0m
       [40mform matches all characters, but must be either empty, or[0m
       [40mhave whole path components, including the trailing [1m/ [22mon each[0m
       [40mcomponent.[0m

       [40mA few examples will make this clearer:[0m

                        [40m+-------------------------+[0m
                        [40m|string    does not match |[0m
                        [40m+-------------------------+[0m
                        [40m|%.c       snot/fred.c    |[0m
                        [40m|%1/%2.c   etc/boo/fred.c |[0m
                        [40m+-------------------------+[0m
       [40m+---------------------------------------------------------------+[0m
       [40m|string                 matches                 setting         |[0m
       [40m+---------------------------------------------------------------+[0m
       [40m|%.c                    fred.c                  %="fred"        |[0m
       [40m|%1/%2.c                snot/fred.c             %1="snot"       |[0m
       [40m|                                               %2="fred"       |[0m
       [40m|%0%5.c                 fred.c                  %0=""           |[0m
       [40m|                                               %5="fred"       |[0m
       [40m|%0%6.c                 snot/fred.c             %0="snot/"      |[0m
       [40m|                                               %6="fred"       |[0m
       [40m|%0%7.c                 etc/boo/fred.c          %0="etc/boo/"   |[0m
       [40m|                                               %7="fred"       |[0m
       [40m|/usr/%1/%1%2/%3.%2%4   /usr/man/man1/fred.1x   %1="man"        |[0m
       [40m|                                               %2="1"          |[0m
       [40m|                                               %3="fred"       |[0m
       [40m|                                               %4="x"          |[0m
       [40m+---------------------------------------------------------------+[0m
       [40mThe [1m%0 [22mbehavior is designed to allow patterns to range over[0m
       [40msubtrees in a controlled manner.  Note that the use of this[0m
       [40msort of pattern in a recipe will result in deeper searches[0m
       [40mthan the naive recipe designer would expect.[0m

       [4m[40m13.1.1[24m  [4mExamples[0m
       [40mThere are two main places where patterns are used: with the[0m
       [4m[40mmatch_mask[24m and [4mfromto[24m functions, and in recipes.[0m

       [40mYou can perform file name filtering and rewriting as[0m
       [40mfollows:[0m
            [40msource_files = [collect cat MANIFEST];[0m
            [40mobject_files =[0m
                    [40m[fromto %0%.c %0%.o [match_mask %0%.c [manifest]]][0m

       
       Peter Miller                                        Page 108





       Cook                                              User Guide



       [40m             [fromto %0%.y %0%.gen.o [match_mask %0%.y [manifest]]][0m
                    [40m;[0m

       [40mThe recipes to go with the above files may be[0m
            [40m%0%.o: %0%.c[0m
                    [40msingle-thread ["if" %0 "then" %.o][0m
            [40m{[0m
                    [40m/* note: no slash before dot */[0m
                    [40mcc -c -I%0. %0%.c;[0m
                    [40mif %0 then[0m
                            [40mmv %.o %0%.o;[0m
            [40m}[0m
       [40mThis recipe can compile files in a large project, where[0m
       [40msource files appear in a number of sub-directories.  The[0m
       [40m``-I%0.'' ensures that there are locally include-able files[0m
       [40min the sub-directories.  If the ``%0'' had been entirely[0m
       [40momitted from the recipe, it will only compile files in the[0m
       [40mcurrent directory.[0m

       [40mA common [4myacc[24m recipe, used when there is more than one yacc[0m
       [40mgrammar in a project, looks like this:[0m
            [40m%0%.gen.c %0%.gen.h: %0%.y[0m
                    [40msingle-thread yy.tab.c yy.tab.h[0m
            [40m{[0m
                    [40myacc -d %0%.y[0m
                    [40myy = [collect echo %0% | sed "'s/[^A-Za-z0-9]/_/'"];[0m
                    [40msed "'s/[yY][yY]/"[yy]"_/g'" yy.tab.c > %0%.gen.c;[0m
                    [40msed "'s/[yY][yY]/"[yy]"_/g'" yy.tab.h > %0%.gen.h;[0m
                    [40mrm yy.tab.c yy.tab.h;[0m
            [40m}[0m
       [40mTo be more selective about the ``%0'' portion, use more[0m
       [40mpattern elements before or after it.[0m

       [4m[40m13.2[24m  [4mRegular[24m [4mExpressions[0m

       [40mThe regular expression pattern matcher uses POSIX regular[0m
       [40mexpressions.  It has asymmetric left-hand-side and right-[0m
       [40mhand-side patterns.  This is best demonstrated with an[0m
       [40mexample recipe:[0m
            [40m\\(.*\\)\\.c \\(.*\\)\\.h: \\1.y[0m
                    [40mset match-mode-regex[0m
            [40m{[0m
                    [40myacc -d \\1.y;[0m
                    [40mmv yy.tab.c \\1.c;[0m
                    [40mmv yy.tab.h \\1.h;[0m
            [40m}[0m
       [40mNotice how the left-hand-side of the recipe (the targets)[0m
       [40muses a completely different style of patterns as the right-[0m
       [40mhand-side (the ingredients and the recipe body).[0m

       [40mAll those backslashes are necessary, because Cook uniformly[0m
       [40mapplies C escapes to strings when it reads them, and it[0m
       [40mdoesn't know you mean a regular expression backslash until[0m
       [40myou use it in a recipe context.[0m

       
       Peter Miller                                        Page 109





       Cook                                              User Guide



       [40mSee [4mre_format[24m(7) for a definition of POSIX 1003.2 regular[0m
       [40mexpressions; you want the ``basic'' REs.[0m

       [40mPlease note that characters which are special to Cook will[0m
       [40mneed to be escaped with a backslash, or enclosed in quotes.[0m
       [40mThese include curly braces (``{'' and ``}''), square[0m
       [40mbrackets (``['' and ``]''), colon (``:'') and equals[0m
       [40m(``='').  Backslash always needs to be escaped, whether[0m
       [40mencoded in a string or not, because within a string it[0m
       [40mserves to escape the string terminator.[0m

       [40mYou also need to remember that dot (``.'') is a common[0m
       [40mcharacter in filenames, and frequenty significant in file[0m
       [40mname patters, but it is a regular expression wildcard.  You[0m
       [40mneed to escape it to make it literal.[0m

       [40mYou need to make absolutely certain that when recipes have[0m
       [40mmore than one left-hand-size (as in the yacc example) that[0m
       [40mthe patterns [4mall[24m assign identical values to their nested[0m
       [40msub-expressions.[0m

       [40mThe usual right-hand-side replacements are available: an[0m
       [40mescaped number is replaced with the [4mn[24m-th nested sub-[0m
       [40mexpression; and the ampersand (``&'') is replaced by the[0m
       [40mwhole left-hand-side (if you have more than one left-hand-[0m
       [40mside, this is ambiguous).  Backslash may be used to escape[0m
       [40mthem.[0m

       [4m[40m13.2.1[24m  [4mExamples[0m
       [40mThere are two main places where patterns are used: with the[0m
       [4m[40mmatch_mask[24m and [4mfromto[24m functions, and in recipes.[0m

       [40mYou can perform file name filtering and rewriting as[0m
       [40mfollows:[0m
            [40mset match-mode-regex;[0m
            [40msource_files = [collect cat MANIFEST];[0m
            [40mobject_files =[0m
                    [40m[fromto \\(.*\\)\\.c \\1.o[0m
                            [40m[match_mask \\(.*\\)\\.c [manifest]]][0m
                    [40m[fromto \\(.*\\)\\.y \\1.gen.o[0m
                            [40m[match_mask \\(.*\\)\\.y [manifest]]][0m
                    [40m;[0m

       [40mThe recipes to go with the above files may be[0m
            [40m\\(.*\\)\\.o: \\1.c[0m
                    [40msingle-thread ["if" [not [in [relative_dirname \\1] .]][0m
                            [40m"then" [notdir \\1.o]][0m
            [40m{[0m
                    [40mcc -c -I[[relative_dirname \\1] \\1.c;[0m
                    [40mif [not [in [relative_dirname \\1] .]] then[0m
                            [40mmv [notdir \\1.o] \\1.o;[0m
            [40m}[0m
       [40mThis recipe can compile files in a large project, where[0m
       [40msource files appear in a number of sub-directories.  The[0m

       
       Peter Miller                                        Page 110





       Cook                                              User Guide



       [40m``-I\\1.'' ensures that there are locally include-able files[0m
       [40min the sub-directories.[0m

       [40mA common [4myacc[24m recipe, used when there is more than one yacc[0m
       [40mgrammar in a project, looks like this:[0m
            [40m\\(.*\\)\\.gen.c \\(.*\\)\\.gen.h: \\1.y[0m
                    [40msingle-thread yy.tab.c yy.tab.h[0m
            [40m{[0m
                    [40myacc -d \\1.y[0m
                    [40myy = [collect echo \\1 | sed "'s/[^A-Za-z0-9]/_/'"];[0m
                    [40msed "'s/[yY][yY]/"[yy]"_/g'" yy.tab.c > \\1.gen.c;[0m
                    [40msed "'s/[yY][yY]/"[yy]"_/g'" yy.tab.h > \\1.gen.h;[0m
                    [40mrm yy.tab.c yy.tab.h;[0m
            [40m}[0m
       [40mTo be more selective about the ``\\(.*\\)'' portion, use[0m
       [40mmore pattern elements before or after it.[0m







































       
       Peter Miller                                        Page 111





       Cook                                              User Guide



       [40m[4m14.[24m  [4mSupplied[24m [4mCookbooks[0m

       [40mA number of cookbooks are supplied with [1mcook[22m.  To make use[0m
       [40mof one, a preprocessor directive of the form[0m
            [40m#include "[4mwhichone[24m"[0m
       [40mmust appear at the start of your cookbook.[0m

       [1m[40mCook [22mdoes not have any "built-in" recipes.  All recipes are[0m
       [40mstored in text files, so they are more easily read,[0m
       [40munderstood, copied, hacked or corrected.  The supplied[0m
       [40mcookbooks live in the [4m/usr/local/share/cook[24m directory.[0m

       [40mYou may supply your own "system" recipes, by placing[0m
       [40mcookbooks into a directory called [4m$HOME/.cook[24m or using the[0m
       [1m[40m-Include [22mcommand line option, possibly in your [4m$COOK[0m
       [40menvironment variable.[0m

       [4m[40m14.1[24m  [4mas[0m

       [40mThis cookbook defines how to use the assembler.[0m

       [4m[40m14.1.1[24m  [4mrecipes[0m

       [40m%.o: %.s  Construct object files from assembler source[0m
                 [40mfiles.[0m

       [4m[40m14.1.2[24m  [4mvariables[0m

       [40mas        The assembler command.  Not altered if already[0m
                 [40mdefined.[0m

       [40mas_flags  Options to pass the assembler command.  Not[0m
                 [40maltered if already defined.  The default is empty.[0m

       [40mas_src    Assembler source files in the current directory.[0m

       [40mdot_src   Source files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_obj   Object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_clean Files which may be removed from the current[0m
                 [40mdirectory in a clean target.[0m









       
       Peter Miller                                        Page 112





       Cook                                              User Guide



       [40m[4m14.2[24m  [4mc[0m

       [40mThis cookbook describes how to work with C files.  Include[0m
       [40mfile dependencies are automatically determined.[0m

       [4m[40m14.2.1[24m  [4mrecipes[0m

       [40m%.o: %.c  Construct object files form C source files, with[0m
                 [40mautomatic include file dependency detection.[0m

       [40m%.ln: %.c Construct lint object files from C source files,[0m
                 [40mwith automatic include file dependency detection.[0m

       [4m[40m14.2.2[24m  [4mvariables[0m

       [40mc_incl    The C include dependency sniffer command.  Not[0m
                 [40maltered if already defined.[0m

       [40mcc        The C compiler command.  Not altered if already[0m
                 [40mdefined.[0m

       [40mlint      The lint command.  Not altered if already defined.[0m

       [40mcc_flags  Options to pass to the C compiler command.  Not[0m
                 [40maltered if already defined.  The default is "-O".[0m

       [40mcc_include_flags Options passed to the C compiler and c_incl[0m
                 [40mcontrolling include file searching.  Not altered[0m
                 [40mif already defined.  The default is empty.[0m

       [40mcc_src    C source files in the current directory.[0m

       [40mdot_src   Source files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_obj   Object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_clean Files which may be removed from the current[0m
                 [40mdirectory in a clean target.[0m

       [40mdot_lint_obj Lint object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [4m[40m14.2.3[24m  [4mSee[24m [4mAlso[0m
       [40mThe ``library'' cookbook, for linking C sources into a[0m
       [40mlibrary.[0m
       [40mThe ``program'' cookbook, for linking C sources into a[0m
       [40mprogram.[0m



       
       Peter Miller                                        Page 113





       Cook                                              User Guide



       [40m[4m14.3[24m  [4mf77[0m

       [40mThis cookbook describes how to work with Fortran files.[0m

       [4m[40m14.3.1[24m  [4mrecipes[0m

       [40m%.o: %.f77 Construct object files form Fortran source files.[0m

       [4m[40m14.3.2[24m  [4mvariables[0m

       [40mf77       The Fortran compiler command.  Not altered if[0m
                 [40malready defined.[0m

       [40mf77_flags Options to pass to the Fortran compiler command.[0m
                 [40mNot altered if already defined.  The default is[0m
                 [40m"-O".[0m

       [40mf77_src   Fortran source files in the current directory.[0m

       [40mdot_src   Source files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_obj   Object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_clean Files which may be removed from the current[0m
                 [40mdirectory in a clean target.[0m

       [4m[40m14.3.3[24m  [4mSee[24m [4mAlso[0m
       [40mThe ``library'' cookbook, for linking Fortran sources into a[0m
       [40mlibrary.[0m
       [40mThe ``program'' cookbook, for linking Fortran sources into a[0m
       [40mprogram.[0m

       [4m[40m14.4[24m  [4mg77[0m

       [40mThis cookbook is the same as the ``f77'' cookbook, but it[0m
       [40msets the [4mf77[24m variable to the GNU Fortran compiler, g77.[0m















       
       Peter Miller                                        Page 114





       Cook                                              User Guide



       [40m[4m14.5[24m  [4mgcc[0m

       [40mThis cookbook is the same as the ``c'' cookbook, but it sets[0m
       [40mthe [4mcc[24m variable to the GNU C compiler, gcc.[0m

       [4m[40m14.6[24m  [4mhome[0m

       [40mThis cookbook defined where certain directories are, and[0m
       [40msome common uses of those directories, relative to $HOME.[0m

       [4m[40m14.6.1[24m  [4mvariables[0m

       [40mhome      The current users' home directory.[0m

       [40mbin       The directory to place program binaries into.[0m

       [40minclude   The directory to place include files into.[0m

       [40mlib       The directory to place libraries into.[0m

       [40mcc_include_flags The [include] directory is appended to the[0m
                 [40msearch options.[0m

       [40mcc_link_flags The [lib] directory is appended to the search[0m
                 [40moptions.[0m

       [4m[40m14.7[24m  [4mlex[0m

       [40mThis cookbook describes how to work with lex files.[0m

       [4m[40m14.7.1[24m  [4mrecipes[0m

       [40m%.c: %.l  Construct C source files from lex source files.[0m

       [4m[40m14.7.2[24m  [4mvariables[0m

       [40mlex       The lex command.  Not altered if already defined.[0m

       [40mlex_flags Options to pass to the lex command.  Not altered[0m
                 [40mif already defined.  The default is empty.[0m

       [40mlex_src   Lex source files in the current directory.[0m

       [40mdot_src   Source files constructible in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_obj   Object files constructible in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_clean Files which may be removed from the current[0m
                 [40mdirectory in a clean target.[0m


       
       Peter Miller                                        Page 115





       Cook                                              User Guide



       [40mdot_lint_obj Lint object files constructible in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [4m[40m14.8[24m  [4mlibrary[0m

       [40mThis cookbook defines how to construct a library.[0m

       [40mIf an include file (or files) are defined for this library,[0m
       [40myou will have to append them to [install] in your [4mHowto.cook[0m
       [40mfile.[0m

       [4m[40m14.8.1[24m  [4mvariables[0m

       [40mall       targets of the all recipe[0m

       [40minstall   targets of the install recipe[0m

       [40mme        The name of the library to be constructed.[0m
                 [40mDefaults to the last component of the pathname of[0m
                 [40mthe current directory.[0m

       [40mar        The archive command.[0m

       [40minstall   targets of the install command.  Only defined if[0m
                 [40mthe [lib] variable is defined.[0m

       [4m[40m14.8.2[24m  [4mrecipes[0m

       [40mall       construct the targets defined in [all].[0m

       [40mclean     remove the files named in [dot_clean].[0m

       [40mclobber   remove the files name in [dot_clean] and [all].[0m

       [40minstall   Construct the files named in [install].  Only[0m
                 [40mdefined if the [lib] variable is defined.[0m

       [40muninstall Remove the files named in [install].  Only defined[0m
                 [40mif the [lib] variable is defined.[0m















       
       Peter Miller                                        Page 116





       Cook                                              User Guide



       [40m[4m14.9[24m  [4mprint[0m

       [40mThis cookbook is used to print files.  It will almost[0m
       [40mcertainly need to be changed for every site.[0m

       [4m[40m14.9.1[24m  [4mrecipes[0m

       [40m%.lw: %.ps Print a PostScript file.[0m

       [40m%.lp: %   Print a text file.[0m

       [4m[40m14.9.2[24m  [4mvariables[0m

       [40mlp        The print command.  Not altered if already[0m
                 [40mdefined.[0m

       [40mlp_flags  Options passed to the print command.  Not altered[0m
                 [40mif already defined.  Defaults to empty.[0m

       [4m[40m14.10[24m  [4mprogram[0m

       [40mThis cookbook defines how to construct a program.[0m

       [40mIf your program uses any libraries, you will have to append[0m
       [40mthem to [ld_libraries] in your [4mHowto.cook[24m file.[0m

       [4m[40m14.10.1[24m  [4mvariables[0m

       [40mall       Targets of the all recipe.[0m

       [40minstall   targets of the install recipe[0m

       [40mld        The name of the linker command.  Not altered if[0m
                 [40malready defined.  Set to the same as the ``cc''[0m
                 [40mvariable if set, otherwise set to the same as the[0m
                 [40m``f77'' variable if set, otherwise set to ``ld''.[0m

       [40mld_flags  Not altered if already defined.  The default is[0m
                 [40mempty.[0m

       [40mld_libraries Options passed to the C compiler when linking,[0m
                 [40mthese are typically library search paths (-L) and[0m
                 [40mlibraries (-l).  Not altered if already defined.[0m
                 [40mThe default is empty.[0m

       [40mme        The name of the program to be constructed.[0m
                 [40mDefaults to the last component of the pathname of[0m
                 [40mthe current directory.[0m

       [4m[40m14.10.2[24m  [4mrecipes[0m

       [40mall       Construct the targets named in [all].[0m



       
       Peter Miller                                        Page 117





       Cook                                              User Guide



       [40mclean     Remove the files named in [dot_clean].[0m

       [40mclobber   Remove the files named in [dot_clean] and [all].[0m

       [40minstall   Construct the files named in [install].  Only[0m
                 [40mdefined if the [lib] variable is defined.[0m

       [40muninstall Remove the files named in [install].  Only defined[0m
                 [40mif the [lib] variable is defined.[0m

       [4m[40m14.10.3[24m  [4mSee[24m [4mAlso[0m
       [40mThe ``c'' cookbook, for C sources.[0m
       [40mThe ``f77'' cookbook, for Fortran sources.[0m
       [40mThe ``usr'' or ``usr.local'' or ``home'' cookbooks, for[0m
       [40mdefining install locations.[0m

       [4m[40m14.11[24m  [4mrcs[0m

       [40mThis cookbook is used to extract files from RCS.[0m

       [4m[40m14.11.1[24m  [4mrecipes[0m

       [40m%: RCS/%,v Extract files from RCS.[0m

       [40m%: %,v    Extract files from RCS.[0m

       [4m[40m14.11.2[24m  [4mvariables[0m

       [40mco        The RCS checkout command.[0m

       [40mco_flags  Flags for the co command, default to empty.[0m

       [4m[40m14.12[24m  [4mrecursive[0m

       [40mThis cookbook may be used to construct recursive cook[0m
       [40mdirewctory structures, where the top-level cookbook only[0m
       [40minvokes cookbooks in deeper directories.[0m

       [40mAll largets given to this cookbook result in all sub-[0m
       [40mdirectories containing a [4mHowto.cook[24m file having [1mcook [22minvoked[0m
       [40mwith the same target.[0m

       [4m[40m14.12.1[24m  [4mRecipes[0m
       [40mThe [4mall[24m recipe is defined, but it does nothing, it only[0m
       [40mexists to set the default target name.[0m










       
       Peter Miller                                        Page 118





       Cook                                              User Guide



       [40m[4m14.13[24m  [4msccs[0m

       [40mThis cookbook is used to extract files from SCCS.[0m

       [4m[40m14.13.1[24m  [4mrecipes[0m

       [40m%: SCCS/s.% Extract files from SCCS.[0m

       [40m%: s.%    Extract files from SCCS.[0m

       [4m[40m14.13.2[24m  [4mvariables[0m

       [40mget       The SCCS get command.[0m

       [40mget_flags Flags for the get command, default to empty.[0m

       [4m[40m14.14[24m  [4mtext[0m

       [40mThis cookbook is used to process text documents.[0m

       [40mInclude file dependencies are automatically detected.  The[0m
       [40mrequirements for various preprocessors are automatically[0m
       [40mdetected ([4me.g.[24m eqn, tbl, pic, graf).[0m

       [4m[40m14.14.1[24m  [4mrecipes[0m

       [40m%.ps: %.t PostScript for generic *roff source.[0m

       [40m%: %.t    Straight text from *roff source.[0m

       [4m[40m14.14.2[24m  [4mvariables[0m

       [40mtext_incl The text_incl command (finds include[0m
                 [40mdependencies).  Not altered if already set.[0m

       [40mtext_roff The text_roff command (finds preprocessor[0m
                 [40mrequirements).  Not altered if already set.[0m

       [40mroff_flags Arguments passed to text_roff, and indirectly to[0m
                 [40mthe *roff program.  Not altered if already set.[0m
                 [40mDefaults to empty.[0m














       
       Peter Miller                                        Page 119





       Cook                                              User Guide



       [40m[4m14.15[24m  [4musr.local[0m

       [40mThis cookbook defined where certain directories are, and[0m
       [40msome common uses of those directories, relative to[0m
       [40m/usr/local.[0m

       [4m[40m14.15.1[24m  [4mvariables[0m

       [40mbin       The directory to place program binaries into.[0m

       [40minclude   The directory to place include files into.[0m

       [40mlib       The directory to place libraries into.[0m

       [40mcc_include_flags The [include] directory is added to the[0m
                 [40msearch options.[0m

       [40mcc_link_flags The [lib] directory is added to the search[0m
                 [40moptions.[0m

       [4m[40m14.16[24m  [4musr[0m

       [40mThis cookbook defined where certain directories are,[0m
       [40mrelative to /usr.[0m

       [4m[40m14.16.1[24m  [4mvariables[0m

       [40mbin       The directory to place program binaries into.[0m

       [40minclude   The directory to place include files into.[0m

       [40mlib       The directory to place libraries into.[0m

       [4m[40m14.17[24m  [4myacc_many[0m

       [40mThis cookbook describes how to use yacc.  The difference[0m
       [40mwith the "yacc" cookbook is that this cookbook allows you to[0m
       [40mhave more that one yacc generated parser in the same[0m
       [40mprogram, by using the classic [4msed[24m(1) hack of the output.[0m
















       
       Peter Miller                                        Page 120





       Cook                                              User Guide



       [40m[4m14.18[24m  [4myacc[0m

       [40mThis cookbook describes how to use yacc.[0m

       [40mYou will have to add "-d" to the [yacc_flags] variable if[0m
       [40myou want %.h files generated.[0m

       [40mIf a [4my.output[24m file is constructed, it will be moved to[0m
       [4m[40m%.list[24m.[0m

       [4m[40m14.18.1[24m  [4mrecipes[0m

       [40m%.c %.h: %.y Construct C source and header files from yacc[0m
                 [40msource files.  Applied if -d in [yacc_flags].[0m

       [40m%.c: %.y  Construct C source files from yacc source files.[0m
                 [40mApplied if -d not in [yacc_flags].[0m

       [4m[40m14.18.2[24m  [4mvariables[0m

       [40myacc_src  Yacc source files in the current directory.[0m

       [40mdot_src   Source files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_obj   Object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m

       [40mdot_clean Files which may be removed from the current[0m
                 [40mdirectory in a clean target.[0m

       [40mdot_lint_obj Lint object files constructable in the current[0m
                 [40mdirectory (unioned with existing setting, if[0m
                 [40mnecessary).[0m



















       
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       [40m[4m15.[24m  [4mGlossary[0m

       [40mThis document employs a number of terms specific to [1mcook[22m.[0m

       [4m[40mbody[24m      A set of statements, usually commands, to be[0m
                 [40mperformed to [4mcook[24m the [4mtarget[24ms of a [4mrecipe[24m after[0m
                 [40mthe [4mingredient[24ms exist.[0m

       [4m[40mcommand[24m   A command is a list of words to be passed to the[0m
                 [4m[40moperating[24m [4msystem[24m to be executed.[0m

       [4m[40mcook[24m      When used as a verb, refers to the actions [1mcook[0m
                 [40mwould perform to create a [4mtarget[24m, according to[0m
                 [40msome [4mrecipe[24m.[0m

       [4m[40mcookbook[24m  A file containing input for [1mcook[22m, usually [4mrecipe[24ms.[0m

       [4m[40mexplicit[24m [4mrecipe[24m An explicit recipe is one where the [4mtarget[24ms[0m
                 [40mcontain no patterns.  That is, there are no[0m
                 [40mpercent ('[1m%[22m') characters in any of the [4mtarget[24ms.[0m

       [4m[40mfingerprint[24m A cryptographically strong hash of the contents[0m
                 [40mof a file, use to determine if the file contents[0m
                 [40mhave changed.[0m

       [4m[40mflag[24m      A flag modifies the behavior of a cook session,[0m
                 [4m[40mrecipe[24m or command.[0m

       [4m[40mforced[24m [4mingredient[24m A files which must exist before a [4mtarget[0m
                 [40mfile of an [4mimplicit[24m [4mrecipe[24m may be cooked.  The[0m
                 [40minability to construct a forced ingredient is an[0m
                 [40merror.[0m

       [4m[40mfunction[24m  A function is an action applied to a word list.[0m

       [4m[40mgate[24m      A gate is a condition which allows the conditional[0m
                 [40mapplication of a [4mrecipe[24m.  The gate condition is in[0m
                 [40maddition to the requirement that the ingredients[0m
                 [40mare cookable.[0m

       [4m[40mimplicit[24m [4mrecipe[24m An implicit recipe is a recipe with patterns[0m
                 [40min the [4mtarget[24ms.  That is, there is a percent ('[1m%[22m')[0m
                 [40mcharacter in at least one of the [4mtarget[24ms.[0m

       [4m[40mingredient[24m A files which must exist before a [4mtarget[24m file may[0m
                 [40mbe cooked.  In an [4mimplicit[24m [4mrecipe[24m the inability to[0m
                 [40mconstruct of an ingredient means that the [4mrecipe[0m
                 [40mwill not be applied.  In an explicit recipe the[0m
                 [40minability to construct an ingredient is an error.[0m

       [4m[40mlast-modified[24m [4mtime[0m
                 [40mUNIX imbues files with several attributes.  One of[0m
                 [40mthese is a time-stamp of when the file was last[0m
                 [40mmodified.  Usually this is when the file was last[0m

       
       Peter Miller                                        Page 122





       Cook                                              User Guide



       [40m          written to.[0m

       [4m[40mrecipe[24m    A [4mrecipe[24m consists of several parts.[0m

                   [40m1.  A set of [4mtarget[24ms to be cooked,[0m

                   [40m2.  A set of ingredients of those [4mtarget[24ms, and[0m

                   [40m3.  An optional set of forced ingredients.[0m

                   [40m4.  An optional set of flags.[0m

                   [40m5.  An optional gate.[0m

                   [40m6.  An optional body .[0m

       [4m[40mtarget[24m    The object of a [4mrecipe[24m, a thing which is cooked.[0m

       [4m[40mtouch[24m     UNIX imbues files with several attributes.  One of[0m
                 [40mthese is a time-stamp of when the file was last[0m
                 [40mmodified.  Usually this is when the file was last[0m
                 [40mwritten to, however it is possible to simply[0m
                 [40madjust this attribute, rather than actually[0m
                 [40mwriting to the file; this is colloquially known as[0m
                 [4m[40mtouch[24ming a file.[0m

       [4m[40mvariable[24m  A variable is a named place holder for a value.[0m
                 [40mThe value may be changed.[0m



























       
       Peter Miller                                        Page 123





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       Peter Miller                                        Page 124









       [40m                          CONTENTS[0m



       [40m1.   Introduction ........................................ 3[0m
            [40m1.1    Why You Want To Use Cook ..................... 3[0m
            [40m1.2    How to Use this Manual ....................... 4[0m
            [40m1.3    Ancient History .............................. 4[0m

       [40m2.   Cook from the Outside ............................... 6[0m
            [40m2.1    What can cook do for me? ..................... 6[0m
            [40m2.2    What is cook doing? .......................... 6[0m
            [40m2.3    What can cook always do? ..................... 6[0m
            [40m2.4    If something goes wrong ...................... 7[0m
            [40m2.5    The Reference Manual ......................... 7[0m

       [40m3.   Cook from a Cookbook ................................ 8[0m
            [40m3.1    What does Cook do? ........................... 8[0m
            [40m3.2    How do I tell Cook what to do? ............... 9[0m
            [40m3.3    Creating a Cookbook ......................... 10[0m

       [40m4.   Cooking in Parallel ................................ 12[0m
            [40m4.1    Command Line Option ......................... 12[0m
            [40m4.2    Cookbook Variable ........................... 12[0m
            [40m4.3    Recipe Writing .............................. 12[0m
            [40m4.4    File Locking ................................ 14[0m
            [40m4.5    Virtual Machine ............................. 14[0m
            [40m4.6    Virtual Machine, Revisited .................. 16[0m

       [40m5.   Include File Dependencies .......................... 19[0m
            [40m5.1    The Manual Method ........................... 19[0m
            [40m5.2    Tools ....................................... 19[0m
            [40m5.3    The Small Method ............................ 20[0m
            [40m5.4    The Large Method ............................ 20[0m
            [40m5.5    The Cascade Method .......................... 22[0m
            [40m5.6    Dependencies on Derived Files ............... 23[0m
            [40m5.7    Renaming Include Files ...................... 24[0m

       [40m6.   Building Large Projects ............................ 25[0m
            [40m6.1    Whole Project Build ......................... 25[0m
            [40m6.2    Private Work Areas .......................... 31[0m
            [40m6.3    Whole Project Build Advantages .............. 34[0m
            [40m6.4    Heterogenous Build .......................... 34[0m
            [40m6.5    Installing Things ........................... 36[0m
            [40m6.6    Miscellaneous ............................... 37[0m
            [40m6.7    File Fingerprints ........................... 38[0m
            [40m6.8    Coping with Links ........................... 41[0m
            [40m6.9    Coping with Version Stamps .................. 41[0m

       [40m7.   Cookbook Language Definition ....................... 43[0m
            [40m7.1    Lexical Analysis ............................ 43[0m
                   [40m7.1.1   Words and Keywords .................. 43[0m
                   [40m7.1.2   Escape Sequences .................... 43[0m


       
                                     i









       [40m            7.1.3   Quoting ............................. 44[0m
                   [40m7.1.4   Comments ............................ 44[0m
            [40m7.2    Preprocessor ................................ 44[0m
                   [40m7.2.1   include ............................. 44[0m
                   [40m7.2.2   include-cooked ...................... 45[0m
                   [40m7.2.3   include-cooked-nowarn ............... 46[0m
                   [40m7.2.4   if .................................. 46[0m
                   [40m7.2.5   ifdef ............................... 47[0m
                   [40m7.2.6   ifndef .............................. 47[0m
                   [40m7.2.7   pragma .............................. 47[0m
            [40m7.3    Syntax and Semantics ........................ 48[0m
                   [40m7.3.1   Overall Structure ................... 48[0m
                   [40m7.3.2   The Compound Statement .............. 48[0m
                   [40m7.3.3   Variables and Expressions ........... 48[0m
                   [40m7.3.4   Recipes ............................. 51[0m
                   [40m7.3.5   The Explicit Recipe Statement ....... 51[0m
                   [40m7.3.6   The Implicit Recipe Statement ....... 56[0m
                   [40m7.3.7   The Ingredients Recipe Statement .... 58[0m
                   [40m7.3.8   The Cascade Recipe Statement ........ 58[0m
                   [40m7.3.9   Commands ............................ 59[0m
                   [40m7.3.10  The Simple Command Statement ........ 59[0m
                   [40m7.3.11  The Data Command Statement .......... 59[0m
                   [40m7.3.12  The Set Statement ................... 60[0m
                   [40m7.3.13  The Fail Statement .................. 61[0m
                   [40m7.3.14  The If Statement .................... 62[0m
                   [40m7.3.15  The Loop and Loopend Statements ..... 62[0m
                   [40m7.3.16  Functions ........................... 63[0m

       [40m8.   Built-In Functions ................................. 65[0m
            [40m8.1    addprefix ................................... 65[0m
            [40m8.2    addsuffix ................................... 65[0m
            [40m8.3    and ......................................... 65[0m
            [40m8.4    basename .................................... 66[0m
            [40m8.5    cando ....................................... 66[0m
            [40m8.6    catenate .................................... 67[0m
            [40m8.7    collect_lines ............................... 67[0m
            [40m8.8    collect ..................................... 68[0m
            [40m8.9    cook ........................................ 68[0m
            [40m8.10   count ....................................... 69[0m
            [40m8.11   defined ..................................... 69[0m
            [40m8.12   dirname ..................................... 69[0m
            [40m8.13   dir ......................................... 70[0m
            [40m8.14   dos-path .................................... 70[0m
            [40m8.15   downcase .................................... 71[0m
            [40m8.16   entryname ................................... 71[0m
            [40m8.17   execute ..................................... 71[0m
            [40m8.18   exists ...................................... 72[0m
            [40m8.19   exists-symlink .............................. 72[0m
            [40m8.20   expr ........................................ 73[0m
            [40m8.21   filter_out .................................. 74[0m
            [40m8.22   filter ...................................... 74[0m
            [40m8.23   find_command ................................ 75[0m
            [40m8.24   findstring .................................. 75[0m


       
                                    ii









       [40m     8.25   firstword ................................... 76[0m
            [40m8.26   fromto ...................................... 76[0m
            [40m8.27   getenv ...................................... 77[0m
            [40m8.28   glob ........................................ 77[0m
            [40m8.29   head ........................................ 78[0m
            [40m8.30   home ........................................ 78[0m
            [40m8.31   if .......................................... 78[0m
            [40m8.32   in .......................................... 79[0m
            [40m8.33   interior_files .............................. 79[0m
            [40m8.34   join ........................................ 80[0m
            [40m8.35   leaf_files .................................. 80[0m
            [40m8.36   matches ..................................... 80[0m
            [40m8.37   match_mask .................................. 81[0m
            [40m8.38   mtime ....................................... 81[0m
            [40m8.39   mtime-seconds ............................... 81[0m
            [40m8.40   notdir ...................................... 82[0m
            [40m8.41   not ......................................... 82[0m
            [40m8.42   operating_system ............................ 83[0m
            [40m8.43   options ..................................... 84[0m
            [40m8.44   or .......................................... 85[0m
            [40m8.45   pathname .................................... 85[0m
            [40m8.46   patsubst .................................... 85[0m
            [40m8.47   prepost ..................................... 86[0m
            [40m8.48   print ....................................... 86[0m
            [40m8.49   quote ....................................... 86[0m
            [40m8.50   readlink .................................... 86[0m
            [40m8.51   relative_dirname ............................ 87[0m
            [40m8.52   resolve ..................................... 87[0m
            [40m8.53   shell ....................................... 88[0m
            [40m8.54   sort_newest ................................. 88[0m
            [40m8.55   sort ........................................ 89[0m
            [40m8.56   split ....................................... 89[0m
            [40m8.57   stringset ................................... 89[0m
            [40m8.58   stripdot .................................... 90[0m
            [40m8.59   strip ....................................... 90[0m
            [40m8.60   substr ...................................... 90[0m
            [40m8.61   subst ....................................... 91[0m
            [40m8.62   suffix ...................................... 91[0m
            [40m8.63   tail ........................................ 92[0m
            [40m8.64   un-dos-path ................................. 92[0m
            [40m8.65   unsplit ..................................... 92[0m
            [40m8.66   upcase ...................................... 93[0m
            [40m8.67   uptodate .................................... 93[0m
            [40m8.68   wildcard .................................... 93[0m
            [40m8.69   word ........................................ 94[0m
            [40m8.70   words ....................................... 95[0m
            [40m8.71   write ....................................... 95[0m

       [40m9.   Predefined Variables ............................... 96[0m
            [40m9.1    arg ......................................... 96[0m
            [40m9.2    command-line-goals .......................... 96[0m
            [40m9.3    __FILE__ .................................... 96[0m
            [40m9.4    __FUNCTION__ ................................ 96[0m


       
                                    iii









       [40m     9.5    graph_leaf_file ............................. 96[0m
            [40m9.6    graph_exterior_file ......................... 96[0m
            [40m9.7    graph_interior_file ......................... 96[0m
            [40m9.8    graph_leaf_pattern .......................... 96[0m
            [40m9.9    graph_exterior_pattern ...................... 97[0m
            [40m9.10   graph_interior_pattern ...................... 97[0m
            [40m9.11   __LINE__ .................................... 97[0m
            [40m9.12   need ........................................ 97[0m
            [40m9.13   parallel_hosts .............................. 97[0m
            [40m9.14   parallel_jobs ............................... 97[0m
            [40m9.15   parallel_rsh ................................ 97[0m
            [40m9.16   search_list ................................. 97[0m
            [40m9.17   self ........................................ 98[0m
            [40m9.18   target ...................................... 98[0m
            [40m9.19   targets ..................................... 98[0m
            [40m9.20   thread-id ................................... 98[0m
            [40m9.21   younger ..................................... 98[0m
            [40m9.22   version ..................................... 98[0m

       [40m10.  Functions Library .................................. 99[0m
            [40m10.1   capitalize .................................. 99[0m
            [40m10.2   defined-or-null ............................. 99[0m
            [40m10.3   defined-or-default .......................... 99[0m
            [40m10.4   repeat ...................................... 99[0m
            [40m10.5   variable_by_path ........................... 100[0m

       [40m11.  Actions when Cooking .............................. 101[0m
            [40m11.1   Scan the COOK Environment Variable ......... 101[0m
            [40m11.2   Scan the Command Line ...................... 101[0m
            [40m11.3   Locate the Cookbook ........................ 101[0m
            [40m11.4   Form the Listing Filename .................. 101[0m
            [40m11.5   Create the Listing file .................... 101[0m
            [40m11.6   Scan the Cookbook .......................... 102[0m
            [40m11.7   Determine targets to cook .................. 102[0m
            [40m11.8   Cooking a Target ........................... 102[0m
            [40m11.9   The Dependency Graph ....................... 105[0m
            [40m11.10  File Status ................................ 106[0m

       [40m12.  Option Precedence ................................. 108[0m

       [40m13.  File name patterns ................................ 109[0m
            [40m13.1   Cook Patterns .............................. 109[0m
            [40m13.2   Regular Expressions ........................ 111[0m

       [40m14.  Supplied Cookbooks ................................ 114[0m
            [40m14.1   as ......................................... 114[0m
            [40m14.2   c .......................................... 115[0m
            [40m14.3   f77 ........................................ 116[0m
            [40m14.4   g77 ........................................ 116[0m
            [40m14.5   gcc ........................................ 117[0m
            [40m14.6   home ....................................... 117[0m
            [40m14.7   lex ........................................ 117[0m
            [40m14.8   library .................................... 118[0m


       
                                    iv









       [40m     14.9   print ...................................... 119[0m
            [40m14.10  program .................................... 119[0m
            [40m14.11  rcs ........................................ 120[0m
            [40m14.12  recursive .................................. 120[0m
            [40m14.13  sccs ....................................... 121[0m
            [40m14.14  text ....................................... 121[0m
            [40m14.15  usr.local .................................. 122[0m
            [40m14.16  usr ........................................ 122[0m
            [40m14.17  yacc_many .................................. 122[0m
            [40m14.18  yacc ....................................... 123[0m

       [40m15.  Glossary .......................................... 124[0m











































       
                                     v

































































                                    vi


