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/v3.7/variable/CMAKE_HOST_SYSTEM_PROCESSOR.html