CMAKE_C_KNOWN_FEATURES

.. versionadded:: 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 :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 listed below.

High level meta features indicating C standard support ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. versionadded:: 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 .. versionadded:: 3.21

Compiler mode is at least C 17.

c_std_23 .. versionadded:: 3.21

Compiler mode is at least C 23.

.. include:: include/CMAKE_LANG_STD_FLAGS.rst

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.