Do not treat
DEFINITIONS as a built-in directory property.
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 3.15.2 warns when the policy is not set and uses
OLD behavior. Use the
cmake_policy() command to set it to
OLD behavior of a policy is
deprecated by definition and may be removed in a future version of CMake.
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