Input directories must have
CMake versions before 2.8 silently ignored missing
CMakeLists.txt files in directories referenced by
subdirs(), treating them as if present but empty. In CMake 2.8.0 and above this
cmake_policy() determines whether or not the case is an error. The
OLD behavior for this policy is to silently ignore the problem. The
NEW behavior for this policy is to report an error.
This policy was introduced in CMake version 2.8.0. 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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