CMAKE_<LANG>_EXTENSIONS
The variations are:
CMAKE_C_EXTENSIONSCMAKE_CXX_EXTENSIONSCMAKE_CUDA_EXTENSIONSCMAKE_HIP_EXTENSIONSCMAKE_OBJC_EXTENSIONSCMAKE_OBJCXX_EXTENSIONS
Default values for <LANG>_EXTENSIONS target properties if set when a target is created. For the compiler's default setting see CMAKE_<LANG>_EXTENSIONS_DEFAULT.
For supported CMake versions see the respective pages.
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/latest/variable/CMAKE_LANG_EXTENSIONS.html
