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 :variable:`CMAKE_C_COMPILE_FEATURES` variable. The features listed here may be used with the :command:`target_compile_features` command. See the :manual:`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_std_90`` Compiler mode is aware of C 90. ``c_std_99`` Compiler mode is aware of C 99. ``c_std_11`` Compiler mode is aware of C 11. ``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``.