New in version 3.4.
Default value for <LANG>_COMPILER_LAUNCHER target property. This variable is used to initialize the property on each target as it is created. This is done only when <LANG> is C, CXX, Fortran, ISPC, OBJC, OBJCXX, or CUDA.
This variable is initialized to the CMAKE_<LANG>_COMPILER_LAUNCHER environment variable if it is set.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_LANG_COMPILER_LAUNCHER.html