CMP0046ΒΆ
Error on non-existent dependency in add_dependencies.
CMake 2.8.12 and lower silently ignored non-existent dependencies
listed in the add_dependencies() command.
The OLD behavior for this policy is to silently ignore non-existent
dependencies. The NEW behavior for this policy is to report an error
if non-existent dependencies are listed in the add_dependencies()
command.
This policy was introduced in CMake version 3.0.
CMake version 3.19.8 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.