1The value of this variable should be set prior to the first
2:command:`project` or :command:`enable_language` command invocation
3because it may influence configuration of the toolchain and flags.
4It is intended to be set locally by the user creating a build tree.
5This variable should be set as a ``CACHE`` entry (or else CMake may
6remove it while initializing a cache entry of the same name).
7
8Despite the ``OSX`` part in the variable name(s) they apply also to
9other SDKs than macOS like iOS, tvOS, or watchOS.
10
11This variable is ignored on platforms other than Apple.
12