CMake/Help/prop_tgt/C_EXTENSIONS.rst

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C_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=gnu11`` instead of ``-std=c11`` to the compile line. This
property is ``ON`` by default. The basic C standard level is
controlled by the :prop_tgt:`C_STANDARD` target property.
See the :manual:`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 :variable:`CMAKE_C_EXTENSIONS` variable if it is set when a target
is created.