CMP0125

The find_file(), find_path(), find_library() and find_program() commands handle cache variables in the same way regardless of whether they are defined on the command line, with or without a type, or using the set() command.

Starting with CMake 3.21, the find_file(), find_path(), find_library(), and find_program() commands ensure that the cache variables will be used in the same way regardless how they were defined and the result will be always successful if the searched artifact exists.

The OLD behavior for this policy is to have the find commands' behaviors differ depending on how the cache variable is defined. The NEW behavior for this policy is to have consistent behavior.

This policy was introduced in CMake version 3.21. Use the cmake_policy() command to set it to OLD or NEW explicitly. Unlike many policies, CMake version 3.21.0-rc3 does not warn when the policy is not set and simply uses OLD behavior.