CMAKE_TOOLCHAIN_FILEΒΆ
New in version 3.21.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
The CMAKE_TOOLCHAIN_FILE environment variable specifies a default value
for the CMAKE_TOOLCHAIN_FILE variable when there is no explicit
configuration given on the first run while creating a new build tree.
On later runs in an existing build tree the value persists in the cache
as CMAKE_TOOLCHAIN_FILE.