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File: //usr/share/cmake/Help/variable/CMAKE_HOST_SYSTEM_NAME.rst
CMAKE_HOST_SYSTEM_NAME
----------------------

Name of the OS CMake is running on.

On systems that have the uname command, this variable is set to the
output of ``uname -s``.  ``Linux``, ``Windows``, and ``Darwin`` for macOS
are the values found on the big three operating systems.