CXX_EXTENSIONS — CMake 3.5.2 Documentation

# CXX_EXTENSIONS

Boolean specifying whether compiler specific extensions are requested.

This property specifies whether compiler specific extensions should be used. For some compilers, this results in adding a flag such as `-std=gnu++11` instead of `-std=c++11` to the compile line. This property is `ON` by default.

See the `cmake-compile-features(7)` manual for information on compile features and a list of supported compilers.

This property is initialized by the value of the `CMAKE_CXX_EXTENSIONS` variable if it is set when a target is created.