CMAKE_OSX_ARCHITECTURES — CMake 3.22.2 Documentation

# CMAKE_OSX_ARCHITECTURES

Target specific architectures for macOS and iOS.

This variable is used to initialize the `OSX_ARCHITECTURES` property on each target as it is created. See that target property for additional information.

The value of this variable should be set prior to the first `project()` or `enable_language()` command invocation because it may influence configuration of the toolchain and flags. It is intended to be set locally by the user creating a build tree. This variable should be set as a `CACHE` entry (or else CMake may remove it while initializing a cache entry of the same name).

Despite the `OSX` part in the variable name(s) they apply also to other SDKs than macOS like iOS, tvOS, or watchOS.

This variable is ignored on platforms other than Apple.