CMAKE_C_KNOWN_FEATURES

List of C features known to this version of CMake.

The features listed in this global property may be known to be available to the C compiler. If the feature is available with the C compiler, it will be listed in the CMAKE_C_COMPILE_FEATURES variable.

The features listed here may be used with the target_compile_features() command. See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

The features known to this version of CMake are:

c_function_prototypes
Function prototypes, as defined in ISO/IEC 9899:1990.
c_restrict
restrict keyword, as defined in ISO/IEC 9899:1999.
c_static_assert
Static assert, as defined in ISO/IEC 9899:2011.
c_variadic_macros
Variadic macros, as defined in ISO/IEC 9899:1999.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/prop_gbl/CMAKE_C_KNOWN_FEATURES.html