CMAKE_SYSTEM_PROCESSOR
The name of the CPU CMake is building for.
This variable is the same as CMAKE_HOST_SYSTEM_PROCESSOR if you build for the host system instead of the target system when cross compiling.
- The Green Hills MULTIgenerator sets this toARMby default.
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Licensed under the BSD 3-clause License.
    https://cmake.org/cmake/help/v3.5/variable/CMAKE_SYSTEM_PROCESSOR.html