CMAKE_C_KNOWN_FEATURES

New in version 3.1.

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 listed below.

High level meta features indicating C standard support

New in version 3.8.

c_std_90

Compiler mode is at least C 90.

c_std_99

Compiler mode is at least C 99.

c_std_11

Compiler mode is at least C 11.

c_std_17

New in version 3.21.

Compiler mode is at least C 17.

c_std_23

New in version 3.21.

Compiler mode is at least C 23.

Low level individual compile features

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.