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