CMAKE_<LANG>_SIMULATE_ID
Identification string of “simulated” compiler.
Some compilers simulate other compilers to serve as drop-in replacements. When CMake detects such a compiler it sets this variable to what would have been the CMAKE_<LANG>_COMPILER_ID for the simulated compiler.
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https://cmake.org/cmake/help/v3.5/variable/CMAKE_LANG_SIMULATE_ID.html