CMake/Help/variable/CMAKE_SYSTEM_NAME.rst

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CMAKE_SYSTEM_NAME
-----------------
The name of the operating system for which CMake is to build.
See the :variable:`CMAKE_SYSTEM_VERSION` variable for the OS version.
System Name for Host Builds
^^^^^^^^^^^^^^^^^^^^^^^^^^^
``CMAKE_SYSTEM_NAME`` is by default set to the same value as the
:variable:`CMAKE_HOST_SYSTEM_NAME` variable so that the build
targets the host system.
System Name for Cross Compiling
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
``CMAKE_SYSTEM_NAME`` may be set explicitly when first configuring a new build
tree in order to enable :ref:`cross compiling <Cross Compiling Toolchain>`.
In this case the :variable:`CMAKE_SYSTEM_VERSION` variable must also be
set explicitly.