Error on non-existent target in get_target_property.
In CMake 2.8.12 and lower, the
get_target_property() command accepted a non-existent target argument without issuing any error or warning. The result variable is set to a
OLD behavior for this policy is to issue no warning and set the result variable to a
-NOTFOUND value. The
NEW behavior for this policy is to issue a
FATAL_ERROR if the command is called with a non-existent target.
This policy was introduced in CMake version 3.0. 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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