New in version 3.19.2.

This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

On Apple Silicon hosts running macOS, set this environment variable to tell CMake what architecture to use for CMAKE_HOST_SYSTEM_PROCESSOR. The value must be either arm64 or x86_64.

The CMAKE_APPLE_SILICON_PROCESSOR normal variable, if set, overrides this environment variable.