CMAKE__FLAGS
From Get docs
Cmake/docs/3.21/variable/cmake lang flags
CMAKE__FLAGS
Flags for all build types.
<LANG> flags used regardless of the value of CMAKE_BUILD_TYPE.
This is initialized for each language from environment variables:
CMAKE_C_FLAGS: Initialized by theCFLAGSenvironment variable.CMAKE_CXX_FLAGS: Initialized by theCXXFLAGSenvironment variable.CMAKE_CUDA_FLAGS: Initialized by theCUDAFLAGSenvironment variable.CMAKE_Fortran_FLAGS: Initialized by theFFLAGSenvironment variable.
This value is a command-line string fragment. Therefore, multiple options should be separated by spaces, and options with spaces should be quoted.
The flags in this variable will be passed to the compiler before those in the per-configuration CMAKE__FLAGS_ variant, and before flags added by the add_compile_options() or target_compile_options() commands.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/variable/CMAKE_LANG_FLAGS.html
