# 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`.