CMP0118

The GENERATED source file property is now visible in all directories.

Whether or not a source file is generated is an all-or-nothing global property of the source. Consequently, the associated GENERATED property is now visible from any directory scope, not only from the scope for which it was set.

The OLD behavior of this policy is to only allow GENERATED to be visible from the directory scope for which it was set. The NEW behavior on the other hand allows it to be visible from any scope.

This policy was introduced in CMake version 3.20. CMake version 3.20.0-rc3 warns when the policy is not set and uses OLD behavior. Use the cmake_policy() command to set it to OLD or NEW explicitly.