CMAKE_SYSTEM_VERSION¶
The version of the operating system for which CMake is to build.
See the CMAKE_SYSTEM_NAME variable for the OS name.
System Version for Host Builds¶
When the CMAKE_SYSTEM_NAME variable takes its default value
then CMAKE_SYSTEM_VERSION is by default set to the same value as the
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 CMAKE_SYSTEM_NAME variable is set explicitly to
enable cross compiling then the
value of CMAKE_SYSTEM_VERSION must also be set explicitly to specify
the target system version.