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CMAKE_SYSTEM_VERSION
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--------------------
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The version of the operating system for which CMake is to build.
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See the :variable:`CMAKE_SYSTEM_NAME` variable for the OS name.
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System Version for Host Builds
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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When the :variable:`CMAKE_SYSTEM_NAME` variable takes its default value
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then ``CMAKE_SYSTEM_VERSION`` is by default set to the same value as the
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:variable:`CMAKE_HOST_SYSTEM_VERSION` variable so that the build targets
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the host system version.
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In the case of a host build then ``CMAKE_SYSTEM_VERSION`` may be set
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explicitly when first configuring a new build tree in order to enable
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targeting the build for a different version of the host operating system
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than is actually running on the host. This is allowed and not considered
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cross compiling so long as the binaries built for the specified OS version
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can still run on the host.
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System Version for Cross Compiling
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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When the :variable:`CMAKE_SYSTEM_NAME` variable is set explicitly to
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enable :ref:`cross compiling <Cross Compiling Toolchain>` then the
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value of ``CMAKE_SYSTEM_VERSION`` must also be set explicitly to specify
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the target system version.
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