The name of the CPU CMake is running on.
On Windows, this variable is set to the value of the environment variable
PROCESSOR_ARCHITECTURE. On systems that support
uname, this variable is set to the output of:
uname -mon GNU, Linux, Cygwin, Darwin, Android, or
archon OpenBSD, or
on other systems,
uname -pif its exit code is nonzero, or
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