CMP0059ΒΆ
New in version 3.3.
Do not treat DEFINITIONS as a built-in directory property.
CMake 3.3 and above no longer make a list of definitions available through
the DEFINITIONS directory property. The
COMPILE_DEFINITIONS directory property may be used instead.
The OLD behavior for this policy is to provide the list of flags given
so far to the add_definitions() command. The NEW behavior is
to behave as a normal user-defined directory property.
This policy was introduced in CMake version 3.3.
CMake version 3.27.5 warns when the policy is not set and uses
OLD behavior. Use the cmake_policy() command to set
it to OLD or NEW explicitly.
Note
The OLD behavior of a policy is
deprecated by definition
and may be removed in a future version of CMake.