CMAKE_<LANG>_COMPILER_PREDEFINES_COMMAND
Command that outputs the compiler pre definitions.
See AUTOMOC which uses CMAKE_CXX_COMPILER_PREDEFINES_COMMAND to generate the AUTOMOC_COMPILER_PREDEFINES.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.17/variable/CMAKE_LANG_COMPILER_PREDEFINES_COMMAND.html