GHC(1)                     Glasgow Haskell Compiler                     GHC(1)



NAME
       GHC - the Glasgow Haskell Compiler



SYNOPSIS
       ghc [option|filename]...
       ghci [option|filename]...


DESCRIPTION
       This manual page documents briefly the ghc and ghci commands.  Note
       that ghci is not yet available on all architectures.  Extensive
       documentation is available in various other formats including DVI,
       PostScript and HTML; see below.


       Each of GHC's command line options is classified as either static or
       dynamic.  A static flag may only be specified on the command line,
       whereas a dynamic flag may also be given in an OPTIONS pragma in a
       source file or set from the GHCi command-line with :set.

       As a rule of thumb, all the language options are dynamic, as are the
       warning options and the debugging options.

       The rest are static, with the notable exceptions of -v, -cpp, -fasm,
       -fvia-C, -fllvm, and " -#include .  The OPTIONS sections lists the
       status of each flag.


       Common suffixes of file names for Haskell are:

       .hs    Haskell source code; preprocess, compile

       .lhs   literate Haskell source; unlit, preprocess, compile

       .hi    Interface file; contains information about exported symbols

       .hc    intermediate C files

       .x_o   way x object files; common ways are: p, u, s

       .x_hi  way x interface files



OPTIONS
   Verbosity options
       -v  -vn  -fprint-explicit-foralls   -fprint-explicit-kinds
       -ferror-spans  -Hsize  -Rghc-timing


   Alternative modes of operation
       --help,-?  --interactive  --make  -e expr  --show-iface  -M
       --supported-extensions, --supported-languages  --show-options  --info
       --version, -V  --numeric-version  --print-libdir


   Which phases to run
       -E  -C  -S  -c  -x suffix


   Redirecting output
       -hcsuf suffix  -hidir dir  -hisuf suffix  -o filename  -odir dir  -ohi
       filename   -osuf suffix  -stubdir dir  -dumpdir dir  -outputdir dir


   Keeping intermediate files
       -keep-hc-file or
                     -keep-hc-files  -keep-llvm-file or
                     -keep-llvm-files  -keep-s-file or
                     -keep-s-files  -keep-tmp-files


   Temporary files
       -tmpdir


   Finding imports
       -idir1:dir2:...  -i


   Interface file options
       -ddump-hi  -ddump-hi-diffs  -ddump-minimal-imports  --show-iface file


   Recompilation checking
       -fforce-recomp -fno-force-recomp


   Interactive-mode options
       -ignore-dot-ghci  -ghci-script  -fbreak-on-error -fno-break-on-error
       -fbreak-on-exception -fno-break-on-exception  -fghci-hist-size=n
       (default is 50)  -fprint-evld-with-show -fno-print-evld-with-show
       -fprint-bind-result -fno-print-bind-result  -fno-print-bind-contents
       -fno-implicit-import-qualified  -interactive-print


   Packages
       -this-package-key P  -package P  -hide-all-packages  -hide-package name
       -ignore-package name  -package-db file  -clear-package-db
       -no-global-package-db  -global-package-db  -no-user-package-db
       -user-package-db  -no-auto-link-packages  -trust P  -distrust P
       -distrust-all


   Language options
       -fcontext-stack=n   -fglasgow-exts -fno-glasgow-exts
       -firrefutable-tuples -fno-irrefutable-tuples  -fpackage-trust
       -ftype-function-depth=n   -XAllowAmbiguousTypes -XNoAllowAmbiguousTypes
       -XArrows -XNoArrows  -XAutoDeriveTypeable -XNoAutoDeriveTypeable
       -XBangPatterns -XNoBangPatterns  -XBinaryLiterals -XNoBinaryLiterals
       -XCApiFFI -XNoCAPIFFI  -XConstrainedClassMethods
       -XNoConstrainedClassMethods  -XConstraintKinds -XNoConstraintKinds
       -XCPP -XNoCPP  -XDataKinds -XNoDataKinds  -XDefaultSignatures
       -XNoDefaultSignatures  -XDeriveAnyClass -XNoDeriveAnyClass
       -XDeriveDataTypeable -XNoDeriveDataTypeable  -XDeriveFunctor
       -XNoDeriveFunctor  -XDeriveFoldable -XNoDeriveFoldable  -XDeriveGeneric
       -XNoDeriveGeneric  -XDeriveTraversable -XNoDeriveTraversable
       -XDisambiguateRecordFields -XNoDisambiguateRecordFields  -XEmptyCase
       -XNoEmptyCase  -XEmptyDataDecls -XNoEmptyDataDecls
       -XExistentialQuantification -XNoExistentialQuantification
       -XExplicitForAll -XNoExplicitForAll  -XExplicitNamespaces
       -XNoExplicitNamespaces  -XExtendedDefaultRules -XNoExtendedDefaultRules
       -XFlexibleContexts -XNoFlexibleContexts  -XFlexibleInstances
       -XNoFlexibleInstances  -XForeignFunctionInterface
       -XNoForeignFunctionInterface  -XFunctionalDependencies
       -XNoFunctionalDependencies  -XGADTs -XNoGADTs  -XGADTSyntax
       -XNoGADTSyntax  -XGeneralizedNewtypeDeriving
       -XNoGeneralizedNewtypeDeriving  -XGenerics -XNoGenerics
       -XImplicitParams -XNoImplicitParams  -XNoImplicitPrelude
       -XImplicitPrelude  -XImpredicativeTypes -XNoImpredicativeTypes
       -XIncoherentInstances -XNoIncoherentInstances  -XInstanceSigs
       -XNoInstanceSigs  -XInterruptibleFFI -XNoInterruptibleFFI
       -XKindSignatures -XNoKindSignatures  -XLambdaCase -XNoLambdaCase
       -XLiberalTypeSynonyms -XNoLiberalTypeSynonyms  -XMagicHash
       -XNoMagicHash  -XMonadComprehensions -XNoMonadComprehensions
       -XMonoLocalBinds -XNoMonoLocalBinds  -XNoMonomorphismRestriction
       -XMonomorphismRestriction  -XMultiParamTypeClasses
       -XNoMultiParamTypeClasses  -XMultiWayIf -XNoMultiWayIf
       -XNamedFieldPuns -XNoNamedFieldPuns  -XNamedWildCards
       -XNoNamedWildCards  -XNegativeLiterals -XNoNegativeLiterals
       -XNoNPlusKPatterns -XNPlusKPatterns  -XNullaryTypeClasses
       -XNoNullaryTypeClasses  -XNumDecimals -XNoNumDecimals
       -XOverlappingInstances -XNoOverlappingInstances  -XOverloadedLists
       -XNoOverloadedLists  -XOverloadedStrings -XNoOverloadedStrings
       -XPackageImports -XNoPackageImports  -XParallelArrays
       -XNoParallelArrays  -XParallelListComp -XNoParallelListComp
       -XPartialTypeSignatures -XNoPartialTypeSignatures  -XPatternGuards
       -XNoPatternGuards  -XPatternSynonyms -XNoPatternSynonyms  -XPolyKinds
       -XNoPolyKinds  -XPolymorphicComponents -XNoPolymorphicComponents
       -XPostfixOperators -XNoPostfixOperators  -XQuasiQuotes -XNoQuasiQuotes
       -XRank2Types -XNoRank2Types  -XRankNTypes -XNoRankNTypes
       -XRebindableSyntax -XNoRebindableSyntax  -XRecordWildCards
       -XNoRecordWildCards  -XRecursiveDo -XNoRecursiveDo  -XRelaxedPolyRec
       -XNoRelaxedPolyRec  -XRoleAnnotations -XNoRoleAnnotations  -XSafe
       -XScopedTypeVariables -XNoScopedTypeVariables  -XStandaloneDeriving
       -XNoStandaloneDeriving  -XTemplateHaskell -XNoTemplateHaskell
       -XNoTraditionalRecordSyntax -XTraditionalRecordSyntax
       -XTransformListComp -XNoTransformListComp  -XTrustworthy
       -XTupleSections -XNoTupleSections  -XTypeFamilies -XNoTypeFamilies
       -XTypeOperators -XNoTypeOperators  -XTypeSynonymInstances
       -XNoTypeSynonymInstances  -XUnboxedTuples -XNoUnboxedTuples
       -XUndecidableInstances -XNoUndecidableInstances  -XUnicodeSyntax
       -XNoUnicodeSyntax  -XUnliftedFFITypes -XNoUnliftedFFITypes  -XUnsafe
       -XViewPatterns -XNoViewPatterns


   Warnings
       -W -w  -w  -Wall -w  -Werror   -Wwarn   -fdefer-type-errors
       -fno-defer-type-errors  -fdefer-typed-holes -fno-defer-typed-holes
       -fhelpful-errors -fno-helpful-errors  -fwarn-deprecated-flags
       -fno-warn-deprecated-flags  -fwarn-duplicate-constraints
       -fno-warn-duplicate-constraints  -fwarn-duplicate-exports
       -fno-warn-duplicate-exports  -fwarn-hi-shadowing -fno-warn-hi-shadowing
       -fwarn-identities -fno-warn-identities  -fwarn-implicit-prelude
       -fno-warn-implicit-prelude  -fwarn-incomplete-patterns
       -fno-warn-incomplete-patterns  -fwarn-incomplete-uni-patterns
       -fno-warn-incomplete-uni-patterns  -fwarn-incomplete-record-updates
       -fno-warn-incomplete-record-updates  -fwarn-lazy-unlifted-bindings
       -fno-warn-lazy-unlifted-bindings  -fwarn-missing-fields
       -fno-warn-missing-fields  -fwarn-missing-import-lists
       -fnowarn-missing-import-lists  -fwarn-missing-methods
       -fno-warn-missing-methods  -fwarn-missing-signatures
       -fno-warn-missing-signatures  -fwarn-missing-exported-sigs
       -fno-warn-missing-exported-sigs  -fwarn-missing-local-sigs
       -fno-warn-missing-local-sigs  -fwarn-monomorphism-restriction
       -fno-warn-monomorphism-restriction  -fwarn-name-shadowing
       -fno-warn-name-shadowing  -fwarn-orphans, -fwarn-auto-orphans
       -fno-warn-orphans, -fno-warn-auto-orphans  -fwarn-overlapping-patterns
       -fno-warn-overlapping-patterns  -fwarn-tabs -fno-warn-tabs
       -fwarn-type-defaults -fno-warn-type-defaults
       -fwarn-unrecognised-pragmas -fno-warn-unrecognised-pragmas
       -fwarn-unticked-promoted-constructors
       -fno-warn-unticked-promoted-constructors  -fwarn-unused-binds
       -fno-warn-unused-binds  -fwarn-unused-imports -fno-warn-unused-imports
       -fwarn-unused-matches -fno-warn-unused-matches  -fwarn-unused-do-bind
       -fno-warn-unused-do-bind  -fwarn-wrong-do-bind -fno-warn-wrong-do-bind
       -fwarn-unsafe -fno-warn-unsafe  -fwarn-safe -fno-warn-safe
       -fwarn-trustworthy-safe -fno-warn-safe  -fwarn-warnings-deprecations
       -fno-warn-warnings-deprecations  -fwarn-amp -fno-warn-amp
       -fwarn-typed-holes -fno-warn-typed-holes
       -fwarn-partial-type-signatures -fno-warn-partial-type-signatures
       -fwarn-deriving-typeable -fno-warn-deriving-typeable


   Optimisation levels
       -O0 -O  -O or -O1 -O0  -O2 -O0  -Odph


   Individual optimisations
       -fcall-arity -fno-call-arity  -fcase-merge -fno-case-merge
       -fcmm-elim-common-blocks -fno-cmm-elim-common-blocks  -fcmm-sink
       -fno-cmm-sink  -fcpr-off  -fcse -fno-cse  -fdicts-cheap
       -fno-dicts-cheap  -fdicts-strict -fno-dicts-strict  -fdmd-tx-dict-sel
                    -fno-dmd-tx-dict-sel  -fdo-eta-reduction
       -fno-do-eta-reduction  -fdo-lambda-eta-expansion
       -fno-do-lambda-eta-expansion  -feager-blackholing
       -fenable-rewrite-rules -fno-enable-rewrite-rules  -fexcess-precision
       -fno-excess-precision  -fexpose-all-unfoldings
       -fno-expose-all-unfoldings  -ffloat-in -fno-float-in  -ffull-laziness
       -fno-full-laziness  -ffun-to-thunk -fno-fun-to-thunk  -fignore-asserts
       -fno-ignore-asserts  -fignore-interface-pragmas
       -fno-ignore-interface-pragmas  -flate-dmd-anal -fno-late-dmd-anal
       -fliberate-case   -fliberate-case-threshold=n
       -fno-liberate-case-threshold  -floopification -fno-loopification
       -fmax-inline-alloc-size=n
                   -fmax-inline-memcpy-insns=n

                   -fmax-inline-memset-insns=n
                     -fmax-relevant-binds=n -fno-max-relevant-bindings
       -fmax-simplifier-iterations=n  -fmax-worker-args=n  -fno-opt-coercion
       -fno-pre-inlining  -fno-state-hack  -fomit-interface-pragmas
       -fno-omit-interface-pragmas  -fomit-yields -fno-omit-yields
       -fpedantic-bottoms -fno-pedantic-bottoms  -fregs-graph -fno-regs-graph
       -fregs-iterative -fno-regs-iterative  -fsimplifier-phases=n
       -fsimpl-tick-factor=n  -fspec-constr -fno-spec-constr
       -fspec-constr-count=n -fno-spec-constr-count  -fspec-constr-threshold=n
       -fno-spec-constr-threshold  -fspecialise -fno-specialise
       -fstatic-argument-transformation -fno-static-argument-transformation
       -fstrictness -fno-strictness  -fstrictness-before=n
       -funbox-small-strict-fields -fno-unbox-small-strict-fields
       -funbox-strict-fields -fno-unbox-strict-fields
       -funfolding-creation-threshold=n  -funfolding-dict-discount=n
       -funfolding-fun-discount=n  -funfolding-keeness-factor=n
       -funfolding-use-threshold=n  -fvectorisation-avoidance
       -fno-vectorisation-avoidance  -fvectorise -fno-vectorise


   Profiling options
       -prof  -fprof-auto -fno-prof-auto  -fprof-auto-top -fno-prof-auto
       -fprof-auto-exported -fno-prof-auto  -fprof-cafs -fno-prof-cafs
       -fno-prof-count-entries -fprof-count-entries  -ticky


   Program coverage options
       -fhpc  -hpcdir dir


   Haskell pre-processor options
       -F


   C pre-processor options
       -cpp  -Dsymbol=value -U  -Usymbol  -Idir


   Code generation options
       -fasm   -fllvm   -fno-code  -fwrite-interface  -fbyte-code
       -fobject-code


   Linking options
       -shared  -staticlib  -fPIC  -dynamic  -dynamic-too  -dyno  -dynosuf
       -dynload  -framework name  -framework-path name  -llib  -Ldir  -main-is
       --mk-dll  -no-hs-main  -rtsopts, -rtsopts={none,some,all}
       -with-rtsopts=opts  -no-link  -split-objs  -static  -threaded  -debug
       -ticky  -eventlog  -fno-gen-manifest  -fno-embed-manifest
       -fno-shared-implib  -dylib-install-name path  -rdynamic


   Plugin options
       -fplugin=module  -fplugin-opt=module:args


   Replacing phases
       -pgmL cmd  -pgmP cmd  -pgmc cmd  -pgmlo cmd  -pgmlc cmd  -pgms cmd
       -pgma cmd  -pgml cmd  -pgmdll cmd  -pgmF cmd  -pgmwindres cmd
       -pgmlibtool cmd  -pgmreadelf cmd


   Forcing options to particular phases
       -optL option  -optP option  -optF option  -optc option  -optlo option
       -optlc option  -opta option  -optl option  -optdll option  -optwindres
       option


   Platform-specific options
       -msse2


   Compiler debugging options
       -dcore-lint  -ddump-to-file  -ddump-asm  -ddump-bcos  -ddump-cmm
       -ddump-core-stats  -ddump-cse  -ddump-deriv  -ddump-ds  -ddump-foreign
       -ddump-hpc  -ddump-inlinings  -ddump-llvm  -ddump-occur-anal
       -ddump-opt-cmm  -ddump-parsed  -ddump-prep  -ddump-rn
       -ddump-rule-firings  -ddump-rule-rewrites  -ddump-rules  -ddump-vect
       -ddump-simpl  -ddump-simpl-iterations  -ddump-spec  -ddump-splices
       -ddump-stg  -ddump-stranal  -ddump-strsigs  -ddump-tc  -dth-dec-file
       -ddump-types  -ddump-worker-wrapper  -ddump-if-trace  -ddump-tc-trace
       -ddump-vt-trace  -ddump-rn-trace  -ddump-rn-stats  -ddump-simpl-stats
       -dno-debug-output  -dppr-debug  -dppr-user-length  -dppr-colsNNN
       -dppr-case-as-let  -dsuppress-all  -dsuppress-uniques
       -dsuppress-idinfo  -dsuppress-module-prefixes
       -dsuppress-type-signatures  -dsuppress-type-applications
       -dsuppress-coercions  -dsource-stats  -dcmm-lint  -dstg-lint
       -dstg-stats  -dverbose-core2core  -dverbose-stg2stg  -dshow-passes
       -dfaststring-stats  -frule-check


   Misc compiler options
       -jN  -fno-hi-version-check  -fhistory-size  -fno-ghci-history
       -fno-ghci-sandbox



VERBOSITY OPTIONS
       -v     verbose mode (equivalent to -v3)
                                                                     [dynamic]


       -vn    set verbosity level
                                                                     [dynamic]


       -fprint-explicit-foralls
              print explicit forall quantification in types
                                                                     [dynamic]


       -fprint-explicit-kinds
              print explicit kind foralls and kind arguments in types
                                                                     [dynamic]


       -ferror-spans
              output full span in error messages
                                                                     [dynamic]


       -Hsize Set the minimum heap size to size
                                                                     [dynamic]


       -Rghc-timing
              Summarise timing stats for GHC (same as +RTS -tstderr)
                                                                     [dynamic]



ALTERNATIVE MODES OF OPERATION
       --help,-?
              Disply help
                                                                        [mode]


       --interactive
              Interactive mode - normally used by just running ghci; see for
              details.
                                                                        [mode]


       --make Build a multi-module Haskell program, automatically figuring out
              dependencies. Likely to be much easier, and faster, than using
              make; see for details..
                                                                        [mode]


       -e expr
              Evaluate expr; see for details.
                                                                        [mode]


       --show-iface
              Display the contents of an interface file.
                                                                        [mode]


       -M     Generate dependency information suitable for use in a Makefile;
              see for details.
                                                                        [mode]


       --supported-extensions, --supported-languages
              display the supported language extensions
                                                                        [mode]


       --show-options
              display the supported command line options
                                                                        [mode]


       --info display information about the compiler
                                                                        [mode]


       --version, -V
              display GHC version
                                                                        [mode]


       --numeric-version
              display GHC version (numeric only)
                                                                        [mode]


       --print-libdir
              display GHC library directory
                                                                        [mode]



WHICH PHASES TO RUN
       -E     Stop after preprocessing (.hspp file)
                                                                        [mode]


       -C     Stop after generating C (.hc file)
                                                                        [mode]


       -S     Stop after generating assembly (.s file)
                                                                        [mode]


       -c     Stop after generating object (.o) file
                                                                        [mode]


       -x suffix
              Override default behaviour for source files
                                                                     [dynamic]



REDIRECTING OUTPUT
       -hcsuf suffix
              set the suffix to use for intermediate C files
                                                                     [dynamic]


       -hidir dir
              set directory for interface files
                                                                     [dynamic]


       -hisuf suffix
              set the suffix to use for interface files
                                                                     [dynamic]


       -o filename
              set output filename
                                                                     [dynamic]


       -odir dir
              set directory for object files
                                                                     [dynamic]


       -ohi filename
              set the filename in which to put the interface
                                                                     [dynamic]


       -osuf suffix
              set the output file suffix
                                                                     [dynamic]


       -stubdir dir
              redirect FFI stub files
                                                                     [dynamic]


       -dumpdir dir
              redirect dump files
                                                                     [dynamic]


       -outputdir dir
              set output directory
                                                                     [dynamic]



KEEPING INTERMEDIATE FILES
       -keep-hc-file or
                            -keep-hc-files retain intermediate .hc files
                                                                     [dynamic]


       -keep-llvm-file or
                            -keep-llvm-files retain intermediate LLVM .ll
              files
                                                                     [dynamic]


       -keep-s-file or
                            -keep-s-files retain intermediate .s files
                                                                     [dynamic]


       -keep-tmp-files
              retain all intermediate temporary files
                                                                     [dynamic]



TEMPORARY FILES
       -tmpdir
              set the directory for temporary files
                                                                     [dynamic]



FINDING IMPORTS
       -idir1:dir2:...
              add dir, dir2, etc. to import path
                                                                [dynamic/:set]


       -i     Empty the import directory list
                                                                [dynamic/:set]



INTERFACE FILE OPTIONS
       -ddump-hi
              Dump the new interface to stdout
                                                                     [dynamic]


       -ddump-hi-diffs
              Show the differences vs. the old interface
                                                                     [dynamic]


       -ddump-minimal-imports
              Dump a minimal set of imports
                                                                     [dynamic]


       --show-iface file
              See .
                                                                            []



RECOMPILATION CHECKING
       -fforce-recomp
              Turn off recompilation checking. This is implied by any -ddump-X
              option when compiling a single file (i.e. when using -c).
                                                                     [dynamic]



INTERACTIVE-MODE OPTIONS
       -ignore-dot-ghci
              Disable reading of .ghci files
                                                                     [dynamic]


       -ghci-script
              Read additional .ghci files
                                                                     [dynamic]


       -fbreak-on-error
              Break on uncaught exceptions and errors
                                                                     [dynamic]


       -fbreak-on-exception
              Break on any exception thrown
                                                                     [dynamic]


       -fghci-hist-size=n
              Set the number of entries GHCi keeps for :history
                                                                     [dynamic]


       -fprint-evld-with-show
              Enable usage of Show instances in :print
                                                                     [dynamic]


       -fprint-bind-result
              Turn on printing of binding results in GHCi
                                                                     [dynamic]


       -fno-print-bind-contents
              Turn off printing of binding contents in GHCi
                                                                     [dynamic]


       -fno-implicit-import-qualified
              Turn off implicit qualified import of everything in GHCi
                                                                     [dynamic]


       -interactive-print
              Select the function to use for printing evaluated expressions in
              GHCi
                                                                     [dynamic]



PACKAGES
       -this-package-key P
              Compile to be part of package P
                                                                     [dynamic]


       -package P
              Expose package P
                                                                [dynamic/:set]


       -hide-all-packages
              Hide all packages by default
                                                                     [dynamic]


       -hide-package name
              Hide package P
                                                                [dynamic/:set]


       -ignore-package name
              Ignore package P
                                                                [dynamic/:set]


       -package-db file
              Add file to the package db stack.
                                                                     [dynamic]


       -clear-package-db
              Clear the package db stack.
                                                                     [dynamic]


       -no-global-package-db
              Remove the global package db from the stack.
                                                                     [dynamic]


       -global-package-db
              Add the global package db to the stack.
                                                                     [dynamic]


       -no-user-package-db
              Remove the user's package db from the stack.
                                                                     [dynamic]


       -user-package-db
              Add the user's package db to the stack.
                                                                     [dynamic]


       -no-auto-link-packages
              Don't automatically link in the base and rts packages.
                                                                     [dynamic]


       -trust P
              Expose package P and set it to be trusted
                                                                [dynamic/:set]


       -distrust P
              Expose package P and set it to be distrusted
                                                                [dynamic/:set]


       -distrust-all
              Distrust all packages by default
                                                                [dynamic/:set]



LANGUAGE OPTIONS
       -fcontext-stack=n
              set the limit for type-class context reduction. Default is 100.
                                                                     [dynamic]


       -fglasgow-exts
              Deprecated. Enable most language extensions; see for exactly
              which ones.
                                                                     [dynamic]


       -firrefutable-tuples
              Make tuple pattern matching irrefutable
                                                                     [dynamic]


       -fpackage-trust
              Enable Safe Haskell trusted package requirement for trustworthy
              modules.
                                                                     [dynamic]


       -ftype-function-depth=n
              set the limit for type function reductions. Default is 200.
                                                                     [dynamic]


       -XAllowAmbiguousTypes
              Allow the user to write ambiguous types, and the type inference
              engine to infer them.
                                                                     [dynamic]


       -XArrows
              Enable arrow notation extension
                                                                     [dynamic]


       -XAutoDeriveTypeable
              As of GHC 7.10, this option is not needed, and should not be
              used. Automatically derive Typeable instances for every datatype
              and type class declaration. Implies -XDeriveDataTypeable.
                                                                     [dynamic]


       -XBangPatterns
              Enable bang patterns.
                                                                     [dynamic]


       -XBinaryLiterals
              Enable support for binary literals.
                                                                     [dynamic]


       -XCApiFFI
              Enable the CAPI calling convention.
                                                                     [dynamic]


       -XConstrainedClassMethods
              Enable constrained class methods.
                                                                     [dynamic]


       -XConstraintKinds
              Enable a kind of constraints.
                                                                     [dynamic]


       -XCPP  Enable the C preprocessor.
                                                                     [dynamic]


       -XDataKinds
              Enable datatype promotion.
                                                                     [dynamic]


       -XDefaultSignatures
              Enable default signatures.
                                                                     [dynamic]


       -XDeriveAnyClass
              Enable deriving for any class.
                                                                     [dynamic]


       -XDeriveDataTypeable
              Enable deriving for the Data class. Implied by
              -XAutoDeriveTypeable.
                                                                     [dynamic]


       -XDeriveFunctor
              Enable deriving for the Functor class. Implied by
              -XDeriveTraversable.
                                                                     [dynamic]


       -XDeriveFoldable
              Enable deriving for the Foldable class. Implied by
              -XDeriveTraversable.
                                                                     [dynamic]


       -XDeriveGeneric
              Enable deriving for the Generic class.
                                                                     [dynamic]


       -XDeriveTraversable
              Enable deriving for the Traversable class. Implies
              -XDeriveFunctor and -XDeriveFoldable.
                                                                     [dynamic]


       -XDisambiguateRecordFields
              Enable record field disambiguation. Implied by
              -XRecordWildCards.
                                                                     [dynamic]


       -XEmptyCase
              Allow empty case alternatives.
                                                                     [dynamic]


       -XEmptyDataDecls
              Enable empty data declarations.
                                                                     [dynamic]


       -XExistentialQuantification
              Enable existential quantification.
                                                                     [dynamic]


       -XExplicitForAll
              Enable explicit universal quantification. Implied by
              -XScopedTypeVariables, -XLiberalTypeSynonyms, -XRankNTypes and
              -XExistentialQuantification.
                                                                     [dynamic]


       -XExplicitNamespaces
              Enable using the keyword type to specify the namespace of
              entries in imports and exports (). Implied by -XTypeOperators
              and -XTypeFamilies.
                                                                     [dynamic]


       -XExtendedDefaultRules
              Use GHCi's extended default rules in a normal module.
                                                                     [dynamic]


       -XFlexibleContexts
              Enable flexible contexts. Implied by -XImplicitParams.
                                                                     [dynamic]


       -XFlexibleInstances
              Enable flexible instances. Implies -XTypeSynonymInstances.
              Implied by -XImplicitParams.
                                                                     [dynamic]


       -XForeignFunctionInterface
              Enable foreign function interface.
                                                                     [dynamic]


       -XFunctionalDependencies
              Enable functional dependencies. Implies -XMultiParamTypeClasses.
                                                                     [dynamic]


       -XGADTs
              Enable generalised algebraic data types. Implies -XGADTSyntax
              and -XMonoLocalBinds.
                                                                     [dynamic]


       -XGADTSyntax
              Enable generalised algebraic data type syntax.
                                                                     [dynamic]


       -XGeneralizedNewtypeDeriving
              Enable newtype deriving.
                                                                     [dynamic]


       -XGenerics
              Deprecated, does nothing. No longer enables generic classes. See
              also GHC's support for generic programming.
                                                                     [dynamic]


       -XImplicitParams
              Enable Implicit Parameters. Implies -XFlexibleContexts and
              -XFlexibleInstances.
                                                                     [dynamic]


       -XNoImplicitPrelude
              Don't implicitly import Prelude. Implied by -XRebindableSyntax.
                                                                     [dynamic]


       -XImpredicativeTypes
              Enable impredicative types. Implies -XRankNTypes.
                                                                     [dynamic]


       -XIncoherentInstances
              Enable incoherent instances. Implies -XOverlappingInstances.
                                                                     [dynamic]


       -XInstanceSigs
              Enable instance signatures.
                                                                     [dynamic]


       -XInterruptibleFFI
              Enable interruptible FFI.
                                                                     [dynamic]


       -XKindSignatures
              Enable kind signatures. Implied by -XTypeFamilies and
              -XPolyKinds.
                                                                     [dynamic]


       -XLambdaCase
              Enable lambda-case expressions.
                                                                     [dynamic]


       -XLiberalTypeSynonyms
              Enable liberalised type synonyms.
                                                                     [dynamic]


       -XMagicHash
              Allow "#" as a postfix modifier on identifiers.
                                                                     [dynamic]


       -XMonadComprehensions
              Enable monad comprehensions.
                                                                     [dynamic]


       -XMonoLocalBinds
              Enable do not generalise local bindings. Implied by
              -XTypeFamilies and -XGADTs.
                                                                     [dynamic]


       -XNoMonomorphismRestriction
              Disable the monomorphism restriction.
                                                                     [dynamic]


       -XMultiParamTypeClasses
              Enable multi parameter type classes. Implied by
              -XFunctionalDependencies.
                                                                     [dynamic]


       -XMultiWayIf
              Enable multi-way if-expressions.
                                                                     [dynamic]


       -XNamedFieldPuns
              Enable record puns.
                                                                     [dynamic]


       -XNamedWildCards
              Enable named wildcards.
                                                                     [dynamic]


       -XNegativeLiterals
              Enable support for negative literals.
                                                                     [dynamic]


       -XNoNPlusKPatterns
              Disable support for n+k patterns.
                                                                     [dynamic]


       -XNullaryTypeClasses
              Deprecated, does nothing. nullary (no parameter) type classes
              are now enabled using -XMultiParamTypeClasses.
                                                                     [dynamic]


       -XNumDecimals
              Enable support for 'fractional' integer literals.
                                                                     [dynamic]


       -XOverlappingInstances
              Enable overlapping instances.
                                                                     [dynamic]


       -XOverloadedLists
              Enable overloaded lists.
                                                                     [dynamic]


       -XOverloadedStrings
              Enable overloaded string literals.
                                                                     [dynamic]


       -XPackageImports
              Enable package-qualified imports.
                                                                     [dynamic]


       -XParallelArrays
              Enable parallel arrays. Implies -XParallelListComp.
                                                                     [dynamic]


       -XParallelListComp
              Enable parallel list comprehensions. Implied by
              -XParallelArrays.
                                                                     [dynamic]


       -XPartialTypeSignatures
              Enable partial type signatures.
                                                                     [dynamic]


       -XPatternGuards
              Enable pattern guards.
                                                                     [dynamic]


       -XPatternSynonyms
              Enable pattern synonyms.
                                                                     [dynamic]


       -XPolyKinds
              Enable kind polymorphism. Implies -XKindSignatures.
                                                                     [dynamic]


       -XPolymorphicComponents
              Enable polymorphic components for data constructors.
                                           [dynamic, synonym for -XRankNTypes]


       -XPostfixOperators
              Enable postfix operators.
                                                                     [dynamic]


       -XQuasiQuotes
              Enable quasiquotation.
                                                                     [dynamic]


       -XRank2Types
              Enable rank-2 types.
                                           [dynamic, synonym for -XRankNTypes]


       -XRankNTypes
              Enable rank-N types. Implied by -XImpredicativeTypes.
                                                                     [dynamic]


       -XRebindableSyntax
              Employ rebindable syntax. Implies -XNoImplicitPrelude.
                                                                     [dynamic]


       -XRecordWildCards
              Enable record wildcards. Implies -XDisambiguateRecordFields.
                                                                     [dynamic]


       -XRecursiveDo
              Enable recursive do (mdo) notation.
                                                                     [dynamic]


       -XRelaxedPolyRec
              (deprecated) Relaxed checking for mutually-recursive polymorphic
              functions.
                                                                     [dynamic]


       -XRoleAnnotations
              Enable role annotations.
                                                                     [dynamic]


       -XSafe Enable the Safe Haskell Safe mode.
                                                                     [dynamic]


       -XScopedTypeVariables
              Enable lexically-scoped type variables.
                                                                     [dynamic]


       -XStandaloneDeriving
              Enable standalone deriving.
                                                                     [dynamic]


       -XTemplateHaskell
              Enable Template Haskell.
                                                                     [dynamic]


       -XNoTraditionalRecordSyntax
              Disable support for traditional record syntax (as supported by
              Haskell 98) C {f = x}
                                                                     [dynamic]


       -XTransformListComp
              Enable generalised list comprehensions.
                                                                     [dynamic]


       -XTrustworthy
              Enable the Safe Haskell Trustworthy mode.
                                                                     [dynamic]


       -XTupleSections
              Enable tuple sections.
                                                                     [dynamic]


       -XTypeFamilies
              Enable type families. Implies -XExplicitNamespaces,
              -XKindSignatures and -XMonoLocalBinds.
                                                                     [dynamic]


       -XTypeOperators
              Enable type operators. Implies -XExplicitNamespaces.
                                                                     [dynamic]


       -XTypeSynonymInstances
              Enable type synonyms in instance heads. Implied by
              -XFlexibleInstances.
                                                                     [dynamic]


       -XUnboxedTuples
              Enable unboxed tuples.
                                                                     [dynamic]


       -XUndecidableInstances
              Enable undecidable instances.
                                                                     [dynamic]


       -XUnicodeSyntax
              Enable unicode syntax.
                                                                     [dynamic]


       -XUnliftedFFITypes
              Enable unlifted FFI types.
                                                                     [dynamic]


       -XUnsafe
              Enable Safe Haskell Unsafe mode.
                                                                     [dynamic]


       -XViewPatterns
              Enable view patterns.
                                                                     [dynamic]



WARNINGS
       -W     enable normal warnings
                                                                     [dynamic]


       -w     disable all warnings
                                                                     [dynamic]


       -Wall  enable almost all warnings (details in )
                                                                     [dynamic]


       -Werror
              make warnings fatal
                                                                     [dynamic]


       -Wwarn make warnings non-fatal
                                                                     [dynamic]


       -fdefer-type-errors
              Turn type errors into warnings, deferring the error until
              runtime. Implies -fdefer-typed-holes.
                                                                     [dynamic]


       -fdefer-typed-holes
              Convert typed hole errors into warnings, deferring the error
              until runtime. Implied by -fdefer-type-errors. See also
              -fwarn-typed-holes.
                                                                     [dynamic]


       -fhelpful-errors
              Make suggestions for mis-spelled names.
                                                                     [dynamic]


       -fwarn-deprecated-flags
              warn about uses of commandline flags that are deprecated
                                                                     [dynamic]


       -fwarn-duplicate-constraints
              warn when a constraint appears duplicated in a type signature
                                                                     [dynamic]


       -fwarn-duplicate-exports
              warn when an entity is exported multiple times
                                                                     [dynamic]


       -fwarn-hi-shadowing
              warn when a .hi file in the current directory shadows a library
                                                                     [dynamic]


       -fwarn-identities
              warn about uses of Prelude numeric conversions that are probably
              the identity (and hence could be omitted)
                                                                     [dynamic]


       -fwarn-implicit-prelude
              warn when the Prelude is implicitly imported
                                                                     [dynamic]


       -fwarn-incomplete-patterns
              warn when a pattern match could fail
                                                                     [dynamic]


       -fwarn-incomplete-uni-patterns
              warn when a pattern match in a lambda expression or pattern
              binding could fail
                                                                     [dynamic]


       -fwarn-incomplete-record-updates
              warn when a record update could fail
                                                                     [dynamic]


       -fwarn-lazy-unlifted-bindings
              (deprecated) warn when a pattern binding looks lazy but must be
              strict
                                                                     [dynamic]


       -fwarn-missing-fields
              warn when fields of a record are uninitialised
                                                                     [dynamic]


       -fwarn-missing-import-lists
              warn when an import declaration does not explicitly list all the
              names brought into scope
                                                                     [dynamic]


       -fwarn-missing-methods
              warn when class methods are undefined
                                                                     [dynamic]


       -fwarn-missing-signatures
              warn about top-level functions without signatures
                                                                     [dynamic]


       -fwarn-missing-exported-sigs
              warn about top-level functions without signatures, only if they
              are exported. takes precedence over -fwarn-missing-signatures
                                                                     [dynamic]


       -fwarn-missing-local-sigs
              warn about polymorphic local bindings without signatures
                                                                     [dynamic]


       -fwarn-monomorphism-restriction
              warn when the Monomorphism Restriction is applied
                                                                     [dynamic]


       -fwarn-name-shadowing
              warn when names are shadowed
                                                                     [dynamic]


       -fwarn-orphans, -fwarn-auto-orphans
              warn when the module contains orphan instance declarations or
              rewrite rules
                                                                     [dynamic]


       -fwarn-overlapping-patterns
              warn about overlapping patterns
                                                                     [dynamic]


       -fwarn-tabs
              warn if there are tabs in the source file
                                                                     [dynamic]


       -fwarn-type-defaults
              warn when defaulting happens
                                                                     [dynamic]


       -fwarn-unrecognised-pragmas
              warn about uses of pragmas that GHC doesn't recognise
                                                                     [dynamic]


       -fwarn-unticked-promoted-constructors
              warn if promoted constructors are not ticked
                                                                     [dynamic]


       -fwarn-unused-binds
              warn about bindings that are unused
                                                                     [dynamic]


       -fwarn-unused-imports
              warn about unnecessary imports
                                                                     [dynamic]


       -fwarn-unused-matches
              warn about variables in patterns that aren't used
                                                                     [dynamic]


       -fwarn-unused-do-bind
              warn about do bindings that appear to throw away values of types
              other than ()
                                                                     [dynamic]


       -fwarn-wrong-do-bind
              warn about do bindings that appear to throw away monadic values
              that you should have bound instead
                                                                     [dynamic]


       -fwarn-unsafe
              warn if the module being compiled is regarded to be unsafe.
              Should be used to check the safety status of modules when using
              safe inference. Works on all module types, even those using
              explicit Safe Haskell modes (such as -XTrustworthy) and so can
              be used to have the compiler check any assumptions made.
                                                                     [dynamic]


       -fwarn-safe
              warn if the module being compiled is regarded to be safe. Should
              be used to check the safety status of modules when using safe
              inference. Works on all module types, even those using explicit
              Safe Haskell modes (such as -XTrustworthy) and so can be used to
              have the compiler check any assumptions made.
                                                                     [dynamic]


       -fwarn-trustworthy-safe
              warn if the module being compiled is marked as -XTrustworthy but
              it could instead be marked as -XSafe, a more informative bound.
              Can be used to detect once a Safe Haskell bound can be improved
              as dependencies are updated.
                                                                     [dynamic]


       -fwarn-warnings-deprecations
              warn about uses of functions & types that have warnings or
              deprecated pragmas
                                                                     [dynamic]


       -fwarn-amp
              (deprecated) warn on definitions conflicting with the
              Applicative-Monad Proposal (AMP)
                                                                     [dynamic]


       -fwarn-typed-holes
              Report warnings when typed hole errors are deferred until
              runtime. See -fdefer-typed-holes.
                                                                     [dynamic]


       -fwarn-partial-type-signatures
              warn about holes in partial type signatures when
              -XPartialTypesignatures is enabled. Not applicable when
              -XPartialTypesignatures is not enabled, in which case errors are
              generated for such holes. See .
                                                                     [dynamic]


       -fwarn-deriving-typeable
              warn when encountering a request to derive an instance of class
              Typeable. As of GHC 7.10, such declarations are unnecessary and
              are ignored by the compiler because GHC has a custom solver for
              discharging this type of constraint.
                                                                     [dynamic]



OPTIMISATION LEVELS
       -O0    Disable optimisations (default)
                                                                     [dynamic]


       -O or -O1
              Enable level 1 optimisations
                                                                     [dynamic]


       -O2    Enable level 2 optimisations
                                                                     [dynamic]


       -Odph  Enable level 2 optimisations, set -fmax-simplifier-iterations=20
              and -fsimplifier-phases=3.
                                                                     [dynamic]



INDIVIDUAL OPTIMISATIONS
       -fcall-arity
              Enable call-arity optimisation. Implied by -O.
                                                                     [dynamic]


       -fcase-merge
              Enable case-merging. Implied by -O.
                                                                     [dynamic]


       -fcmm-elim-common-blocks
              Enable Cmm common block elimination. Implied by -O.
                                                                     [dynamic]


       -fcmm-sink
              Enable Cmm sinking. Implied by -O.
                                                                     [dynamic]


       -fcpr-off
              Switch off CPR analysis in the demand analyser.
                                                                      [static]


       -fcse  Enable common sub-expression elimination. Implied by -O.
                                                                     [dynamic]


       -fdicts-cheap
              Make dictionary-valued expressions seem cheap to the optimiser.
                                                                     [dynamic]


       -fdicts-strict
              Make dictionaries strict
                                                                     [dynamic]


       -fdmd-tx-dict-sel

              Use a special demand transformer for dictionary selectors.
              Always enabled by default.
                                                                     [dynamic]


       -fdo-eta-reduction
              Enable eta-reduction. Implied by -O.
                                                                     [dynamic]


       -fdo-lambda-eta-expansion
              Enable lambda eta-expansion. Always enabled by default.
                                                                     [dynamic]


       -feager-blackholing
              Turn on eager blackholing
                                                                     [dynamic]


       -fenable-rewrite-rules
              Switch on all rewrite rules (including rules generated by
              automatic specialisation of overloaded functions). Implied by
              -O.
                                                                     [dynamic]


       -fexcess-precision
              Enable excess intermediate precision
                                                                     [dynamic]


       -fexpose-all-unfoldings
              Expose all unfoldings, even for very large or recursive
              functions.
                                                                     [dynamic]


       -ffloat-in
              Turn on the float-in transformation. Implied by -O.
                                                                     [dynamic]


       -ffull-laziness
              Turn on full laziness (floating bindings outwards). Implied by
              -O.
                                                                     [dynamic]


       -ffun-to-thunk
              Allow worker-wrapper to convert a function closure into a thunk
              if the function does not use any of its arguments. Off by
              default.
                                                                     [dynamic]


       -fignore-asserts
              Ignore assertions in the source. Implied by -O.
                                                                     [dynamic]


       -fignore-interface-pragmas
              Ignore pragmas in interface files. Implied by -O0 only.
                                                                     [dynamic]


       -flate-dmd-anal
              Run demand analysis again, at the end of the simplification
              pipeline
                                                                     [dynamic]


       -fliberate-case
              Turn on the liberate-case transformation. Implied by -O2.
                                                                     [dynamic]


       -fliberate-case-threshold=n
              Set the size threshold for the liberate-case transformation to n
              (default: 2000)
                                                                     [dynamis]


       -floopification
              Turn saturated self-recursive tail-calls into local jumps in the
              generated assembly. Implied by -O.
                                                                     [dynamic]


       -fmax-inline-alloc-size=n
              Set the maximum size of inline array allocations to n bytes
              (default: 128). GHC will allocate non-pinned arrays of
              statically known size in the current nursery block if they're no
              bigger than n bytes, ignoring GC overheap. This value should be
              quite a bit smaller than the block size (typically: 4096).
                                                                     [dynamic]



                   -fmax-inline-memcpy-insns=n

              Inline memcpy calls if they would generate no more than n pseudo
              instructions (default: 32).
                                                                     [dynamic]



                   -fmax-inline-memset-insns=n

              Inline memset calls if they would generate no more than n pseudo
              instructions (default: 32).
                                                                     [dynamic]


       -fmax-relevant-binds=n
              Set the maximum number of bindings to display in type error
              messages (default 6).
                                                                     [dynamic]


       -fmax-simplifier-iterations=n
              Set the max iterations for the simplifier (default 4).
                                                                     [dynamic]


       -fmax-worker-args=n
              If a worker has that many arguments, none will be unpacked
              anymore (default: 10)
                                                                     [dynamic]


       -fno-opt-coercion
              Turn off the coercion optimiser
                                                                      [static]


       -fno-pre-inlining
              Turn off pre-inlining
                                                                     [dynamic]


       -fno-state-hack
              Turn off the "state hack" whereby any lambda with a real-world
              state token as argument is considered to be single-entry. Hence
              OK to inline things inside it.
                                                                      [static]


       -fomit-interface-pragmas
              Don't generate interface pragmas. Implied by -O0 only.
                                                                     [dynamic]


       -fomit-yields
              Omit heap checks when no allocation is being performed.
                                                                     [dynamic]


       -fpedantic-bottoms
              Make GHC be more precise about its treatment of bottom (but see
              also -fno-state-hack). In particular, GHC will not eta-expand
              through a case expression.
                                                                     [dynamic]


       -fregs-graph
              Use the graph colouring register allocator for register
              allocation in the native code generator. Implied by -O2.
                                                                     [dynamic]


       -fregs-iterative
              Use the iterative coalescing graph colouring register allocator
              in the native code generator.
                                                                     [dynamic]


       -fsimplifier-phases=n
              Set the number of phases for the simplifier (default 2). Ignored
              with -O0.
                                                                     [dynamic]


       -fsimpl-tick-factor=n
              Set the percentage factor for simplifier ticks (default 100)
                                                                     [dynamic]


       -fspec-constr
              Turn on the SpecConstr transformation. Implied by -O2.
                                                                     [dynamic]


       -fspec-constr-count=n
              Set to n (default: 3) the maximum number of specialisations that
              will be created for any one function by the SpecConstr
              transformation
                                                                     [dynamic]


       -fspec-constr-threshold=n
              Set the size threshold for the SpecConstr transformation to n
              (default: 2000)
                                                                     [dynamic]


       -fspecialise
              Turn on specialisation of overloaded functions. Implied by -O.
                                                                     [dynamic]


       -fstatic-argument-transformation
              Turn on the static argument transformation.
                                                                     [dynamic]


       -fstrictness
              Turn on strictness analysis. Implied by -O.
                                                                     [dynamic]


       -fstrictness-before=n
              Run an additional strictness analysis before simplifier phase n
                                                                     [dynamic]


       -funbox-small-strict-fields
              Flatten strict constructor fields with a pointer-sized
              representation. Implied by -O.
                                                                     [dynamic]


       -funbox-strict-fields
              Flatten strict constructor fields
                                                                     [dynamic]


       -funfolding-creation-threshold=n
              Tweak unfolding settings. Default: 750
                                                                     [dynamic]


       -funfolding-dict-discount=n
              Tweak unfolding settings. Default: 30
                                                                     [dynamic]


       -funfolding-fun-discount=n
              Tweak unfolding settings. Default: 60
                                                                     [dynamic]


       -funfolding-keeness-factor=n
              Tweak unfolding settings. Default: 1.5
                                                                     [dynamic]


       -funfolding-use-threshold=n
              Tweak unfolding settings. Default: 60
                                                                     [dynamic]


       -fvectorisation-avoidance
              Enable vectorisation avoidance. Always enabled by default.
                                                                     [dynamic]


       -fvectorise
              Enable vectorisation of nested data parallelism
                                                                     [dynamic]



PROFILING OPTIONS
       -prof  Turn on profiling
                                                                     [dynamic]


       -fprof-auto
              Auto-add SCCs to all bindings not marked INLINE
                                                                     [dynamic]


       -fprof-auto-top
              Auto-add SCCs to all top-level bindings not marked INLINE
                                                                     [dynamic]


       -fprof-auto-exported
              Auto-add SCCs to all exported bindings not marked INLINE
                                                                     [dynamic]


       -fprof-cafs
              Auto-add SCCs to all CAFs
                                                                     [dynamic]


       -fno-prof-count-entries
              Do not collect entry counts
                                                                     [dynamic]


       -ticky Turn on ticky-ticky profiling
                                                                     [dynamic]



PROGRAM COVERAGE OPTIONS
       -fhpc  Turn on Haskell program coverage instrumentation
                                                                     [dynamic]


       -hpcdir dir
              Directory to deposit .mix files during compilation (default is
              .hpc)
                                                                     [dynamic]



HASKELL PRE-PROCESSOR OPTIONS
       -F     Enable the use of a pre-processor (set with -pgmF)
                                                                     [dynamic]



C PRE-PROCESSOR OPTIONS
       -cpp   Run the C pre-processor on Haskell source files
                                                                     [dynamic]


       -Dsymbol=value
              Define a symbol in the C pre-processor
                                                                     [dynamic]


       -Usymbol
              Undefine a symbol in the C pre-processor
                                                                     [dynamic]


       -Idir  Add dir to the directory search list for #include files
                                                                     [dynamic]



CODE GENERATION OPTIONS
       -fasm  Use the native code generator
                                                                     [dynamic]


       -fllvm Compile using the LLVM code generator
                                                                     [dynamic]


       -fno-code
              Omit code generation
                                                                     [dynamic]


       -fwrite-interface
              Always write interface files
                                                                     [dynamic]


       -fbyte-code
              Generate byte-code
                                                                     [dynamic]


       -fobject-code
              Generate object code
                                                                     [dynamic]



LINKING OPTIONS
       -shared
              Generate a shared library (as opposed to an executable)
                                                                     [dynamic]


       -staticlib
              On Darwin/OS X/iOS only, generate a standalone static library
              (as opposed to an executable). This is the usual way to compile
              for iOS.
                                                                     [dynamic]


       -fPIC  Generate position-independent code (where available)
                                                                     [dynamic]


       -dynamic
              Use dynamic Haskell libraries (if available)
                                                                     [dynamic]


       -dynamic-too
              Build dynamic object files as well as static object files during
              compilation
                                                                     [dynamic]


       -dyno  Set the output path for the dynamically linked objects
                                                                     [dynamic]


       -dynosuf
              Set the output suffix for dynamic object files
                                                                     [dynamic]


       -dynload
              Selects one of a number of modes for finding shared libraries at
              runtime.
                                                                     [dynamic]


       -framework name
              On Darwin/OS X/iOS only, link in the framework name. This option
              corresponds to the -framework option for Apple's Linker.
                                                                     [dynamic]


       -framework-path name
              On Darwin/OS X/iOS only, add dir to the list of directories
              searched for frameworks. This option corresponds to the -F
              option for Apple's Linker.
                                                                     [dynamic]


       -llib  Link in library lib
                                                                     [dynamic]


       -Ldir  Add dir to the list of directories searched for libraries
                                                                     [dynamic]


       -main-is
              Set main module and function
                                                                     [dynamic]


       --mk-dll
              DLL-creation mode (Windows only)
                                                                     [dynamic]


       -no-hs-main
              Don't assume this program contains main
                                                                     [dynamic]


       -rtsopts, -rtsopts={none,some,all}
              Control whether the RTS behaviour can be tweaked via command-
              line flags and the GHCRTS environment variable. Using none means
              no RTS flags can be given; some means only a minimum of safe
              options can be given (the default), and all (or no argument at
              all) means that all RTS flags are permitted.
                                                                     [dynamic]


       -with-rtsopts=opts
              Set the default RTS options to opts.
                                                                     [dynamic]


       -no-link
              Omit linking
                                                                     [dynamic]


       -split-objs
              Split objects (for libraries)
                                                                     [dynamic]


       -static
              Use static Haskell libraries
                                                                     [dynamic]


       -threaded
              Use the threaded runtime
                                                                     [dynamic]


       -debug Use the debugging runtime
                                                                     [dynamic]


       -ticky For linking, this simply implies -debug; see .
                                                                     [dynamic]


       -eventlog
              Enable runtime event tracing
                                                                     [dynamic]


       -fno-gen-manifest
              Do not generate a manifest file (Windows only)
                                                                     [dynamic]


       -fno-embed-manifest
              Do not embed the manifest in the executable (Windows only)
                                                                     [dynamic]


       -fno-shared-implib
              Don't generate an import library for a DLL (Windows only)
                                                                     [dynamic]


       -dylib-install-name path
              Set the install name (via -install_name passed to Apple's
              linker), specifying the full install path of the library file.
              Any libraries or executables that link with it later will pick
              up that path as their runtime search location for it. (Darwin/OS
              X only)
                                                                     [dynamic]


       -rdynamic
              This instructs the linker to add all symbols, not only used
              ones, to the dynamic symbol table. Currently Linux and
              Windows/MinGW32 only. This is equivalent to using -optl
              -rdynamic on Linux, and -optl -export-all-symbols on Windows.
                                                                     [dynamic]



PLUGIN OPTIONS
       -fplugin=module
              Load a plugin exported by a given module
                                                                     [dynamic]


       -fplugin-opt=module:args
              Give arguments to a plugin module; module must be specified with
              -fplugin
                                                                     [dynamic]



REPLACING PHASES
       -pgmL cmd
              Use cmd as the literate pre-processor
                                                                     [dynamic]


       -pgmP cmd
              Use cmd as the C pre-processor (with -cpp only)
                                                                     [dynamic]


       -pgmc cmd
              Use cmd as the C compiler
                                                                     [dynamic]


       -pgmlo cmd
              Use cmd as the LLVM optimiser
                                                                     [dynamic]


       -pgmlc cmd
              Use cmd as the LLVM compiler
                                                                     [dynamic]


       -pgms cmd
              Use cmd as the splitter
                                                                     [dynamic]


       -pgma cmd
              Use cmd as the assembler
                                                                     [dynamic]


       -pgml cmd
              Use cmd as the linker
                                                                     [dynamic]


       -pgmdll cmd
              Use cmd as the DLL generator
                                                                     [dynamic]


       -pgmF cmd
              Use cmd as the pre-processor (with -F only)
                                                                     [dynamic]


       -pgmwindres cmd
              Use cmd as the program for embedding manifests on Windows.
                                                                     [dynamic]


       -pgmlibtool cmd
              Use cmd as the command for libtool (with -staticlib only).
                                                                     [dynamic]


       -pgmreadelf cmd
              Use cmd as the command for readelf (part of Unix binutils)
                                                                     [dynamic]



FORCING OPTIONS TO PARTICULAR PHASES
       -optL option
              pass option to the literate pre-processor
                                                                     [dynamic]


       -optP option
              pass option to cpp (with -cpp only)
                                                                     [dynamic]


       -optF option
              pass option to the custom pre-processor
                                                                     [dynamic]


       -optc option
              pass option to the C compiler
                                                                     [dynamic]


       -optlo option
              pass option to the LLVM optimiser
                                                                     [dynamic]


       -optlc option
              pass option to the LLVM compiler
                                                                     [dynamic]


       -opta option
              pass option to the assembler
                                                                     [dynamic]


       -optl option
              pass option to the linker
                                                                     [dynamic]


       -optdll option
              pass option to the DLL generator
                                                                     [dynamic]


       -optwindres option
              pass option to windres.
                                                                     [dynamic]



PLATFORM-SPECIFIC OPTIONS
       -msse2 (x86 only) Use SSE2 for floating point
                                                                     [dynamic]



COMPILER DEBUGGING OPTIONS
       -dcore-lint
              Turn on internal sanity checking
                                                                     [dynamic]


       -ddump-to-file
              Dump to files instead of stdout
                                                                     [dynamic]


       -ddump-asm
              Dump assembly
                                                                     [dynamic]


       -ddump-bcos
              Dump interpreter byte code
                                                                     [dynamic]


       -ddump-cmm
              Dump C-- output
                                                                     [dynamic]


       -ddump-core-stats
              Print a one-line summary of the size of the Core program at the
              end of the optimisation pipeline
                                                                     [dynamic]


       -ddump-cse
              Dump CSE output
                                                                     [dynamic]


       -ddump-deriv
              Dump deriving output
                                                                     [dynamic]


       -ddump-ds
              Dump desugarer output
                                                                     [dynamic]


       -ddump-foreign
              Dump foreign export stubs
                                                                     [dynamic]


       -ddump-hpc
              Dump after instrumentation for program coverage
                                                                     [dynamic]


       -ddump-inlinings
              Dump inlining info
                                                                     [dynamic]


       -ddump-llvm
              Dump LLVM intermediate code
                                                                     [dynamic]


       -ddump-occur-anal
              Dump occurrence analysis output
                                                                     [dynamic]


       -ddump-opt-cmm
              Dump the results of C-- to C-- optimising passes
                                                                     [dynamic]


       -ddump-parsed
              Dump parse tree
                                                                     [dynamic]


       -ddump-prep
              Dump prepared core
                                                                     [dynamic]


       -ddump-rn
              Dump renamer output
                                                                     [dynamic]


       -ddump-rule-firings
              Dump rule firing info
                                                                     [dynamic]


       -ddump-rule-rewrites
              Dump detailed rule firing info
                                                                     [dynamic]


       -ddump-rules
              Dump rules
                                                                     [dynamic]


       -ddump-vect
              Dump vectoriser input and output
                                                                     [dynamic]


       -ddump-simpl
              Dump final simplifier output
                                                                     [dynamic]


       -ddump-simpl-iterations
              Dump output from each simplifier iteration
                                                                     [dynamic]


       -ddump-spec
              Dump specialiser output
                                                                     [dynamic]


       -ddump-splices
              Dump TH spliced expressions, and what they evaluate to
                                                                     [dynamic]


       -ddump-stg
              Dump final STG
                                                                     [dynamic]


       -ddump-stranal
              Dump strictness analyser output
                                                                     [dynamic]


       -ddump-strsigs
              Dump strictness signatures
                                                                     [dynamic]


       -ddump-tc
              Dump typechecker output
                                                                     [dynamic]


       -dth-dec-file
              Show evaluated TH declarations in a .th.hs file
                                                                     [dynamic]


       -ddump-types
              Dump type signatures
                                                                     [dynamic]


       -ddump-worker-wrapper
              Dump worker-wrapper output
                                                                     [dynamic]


       -ddump-if-trace
              Trace interface files
                                                                     [dynamic]


       -ddump-tc-trace
              Trace typechecker
                                                                     [dynamic]


       -ddump-vt-trace
              Trace vectoriser
                                                                     [dynamic]


       -ddump-rn-trace
              Trace renamer
                                                                     [dynamic]


       -ddump-rn-stats
              Renamer stats
                                                                     [dynamic]


       -ddump-simpl-stats
              Dump simplifier stats
                                                                     [dynamic]


       -dno-debug-output
              Suppress unsolicited debugging output
                                                                      [static]


       -dppr-debug
              Turn on debug printing (more verbose)
                                                                      [static]


       -dppr-user-length
              Set the depth for printing expressions in error msgs
                                                                     [dynamic]


       -dppr-colsNNN
              Set the width of debugging output. For example -dppr-cols200
                                                                     [dynamic]


       -dppr-case-as-let
              Print single alternative case expressions as strict lets.
                                                                     [dynamic]


       -dsuppress-all
              In core dumps, suppress everything (except for uniques) that is
              suppressible.
                                                                     [dynamic]


       -dsuppress-uniques
              Suppress the printing of uniques in debug output (easier to use
              diff)
                                                                     [dynamic]


       -dsuppress-idinfo
              Suppress extended information about identifiers where they are
              bound
                                                                     [dynamic]


       -dsuppress-module-prefixes
              Suppress the printing of module qualification prefixes
                                                                     [dynamic]


       -dsuppress-type-signatures
              Suppress type signatures
                                                                     [dynamic]


       -dsuppress-type-applications
              Suppress type applications
                                                                     [dynamic]


       -dsuppress-coercions
              Suppress the printing of coercions in Core dumps to make them
              shorter
                                                                     [dynamic]


       -dsource-stats
              Dump haskell source stats
                                                                     [dynamic]


       -dcmm-lint
              C-- pass sanity checking
                                                                     [dynamic]


       -dstg-lint
              STG pass sanity checking
                                                                     [dynamic]


       -dstg-stats
              Dump STG stats
                                                                     [dynamic]


       -dverbose-core2core
              Show output from each core-to-core pass
                                                                     [dynamic]


       -dverbose-stg2stg
              Show output from each STG-to-STG pass
                                                                     [dynamic]


       -dshow-passes
              Print out each pass name as it happens
                                                                     [dynamic]


       -dfaststring-stats
              Show statistics for fast string usage when finished
                                                                     [dynamic]


       -frule-check
              Report sites with rules that could have fired but didn't. Takes
              a string argument.
                                                                     [dynamic]



MISC COMPILER OPTIONS
       -jN    When compiling with --make, compile N modules in parallel.
                                                                     [dynamic]


       -fno-hi-version-check
              Don't complain about .hi file mismatches
                                                                     [dynamic]


       -fhistory-size
              Set simplification history size
                                                                     [dynamic]


       -fno-ghci-history
              Do not use the load/store the GHCi command history from/to
              ghci_history.
                                                                     [dynamic]


       -fno-ghci-sandbox
              Turn off the GHCi sandbox. Means computations are run in the
              main thread, rather than a forked thread.
                                                                     [dynamic]




FILES
       /usr/local/lib


COPYRIGHT
       Copyright 2002, The University Court of the University of Glasgow.
       All rights reserved.



AUTHOR
       This manual page was generated from the XML documentation of GHC with
       blood, sweat, tears and a breaks-if-you-look-at-it-the-wrong-way XSL
       stylesheet originally written by Michael Weber <michaelw@debian.org>
       for the Debian GNU/Linux system (but may be used by others).




Glasgow FP Suite                  2002-10-25                            GHC(1)
