CMAKE_<LANG>_FLAGS_INIT

Value used to initialize the CMAKE_<LANG>_FLAGS cache entry the first time a build tree is configured for language <LANG>. This variable is meant to be set by a toolchain file. CMake may prepend or append content to the value based on the environment and target platform.

See also the configuration-specific CMAKE_<LANG>_FLAGS_<CONFIG>_INIT variable.

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https://cmake.org/cmake/help/v3.17/variable/CMAKE_LANG_FLAGS_INIT.html