CMAKE_HOST_SYSTEM_PROCESSOR
The name of the CPU CMake is running on.
On systems that support uname, this variable is set to the output of uname -p. On Windows it is set to the value of the environment variable PROCESSOR_ARCHITECTURE.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/CMAKE_HOST_SYSTEM_PROCESSOR.html