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- QNX C/C++ compiler is identified in `CMAKE_<LANG>_COMPILER_ID` as value "QCC". The qcc/q++ are frontend compiler commands that invoke the GNU compiler (gcc/g++) as a backend compiler, but it's treated as a separate compiler with its own ID for better determination. - The C/C++ compiler on UnixWare/OpenServer is identified in `CMAKE_<LANG>_COMPILER_ID` as value "SCO", (compiler that defines the `__SCO_VERSION__` preprocessor macro).