Strict checking for the
CMake 3.1 and lower allowed calls to the
outside of a loop context and also ignored any given arguments.
This was undefined behavior.
The OLD behavior for this policy is to allow
break() to be placed
outside of loop contexts and ignores any arguments. The NEW behavior for this
policy is to issue an error if a misplaced break or any arguments are found.
This policy was introduced in CMake version 3.2. CMake version 3.6.2 warns when the policy is not set and uses OLD behavior. Use the cmake_policy command to set it to OLD or NEW explicitly.
OLD behavior of a policy is
deprecated by definition
and may be removed in a future version of CMake.