New in version 3.1.
List of features known to the C compiler
These features are known to be available for use with the C compiler. This list is a subset of the features listed in the CMAKE_C_KNOWN_FEATURES global property.
See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_C_COMPILE_FEATURES.html