cmake / 3.14.7 / variable / cmake_c_extensions.html /

CMAKE_C_EXTENSIONS

Default value for C_EXTENSIONS property of targets.

This variable is used to initialize the C_EXTENSIONS property on all targets. See that target property for additional information.

See the cmake-compile-features(7) manual for information on compile features and a list of supported compilers.

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https://cmake.org/cmake/help/v3.14/variable/CMAKE_C_EXTENSIONS.html