Disallow include export result.
CMake 2.8.12 and lower allowed use of the
include() command with the result of the
export() command. This relies on the assumption that the
export() command has an immediate effect at configure-time during a cmake run. Certain properties of targets are not fully determined until later at generate-time, such as the link language and complete list of link libraries. Future refactoring will change the effect of the
export() command to be executed at generate-time. Use
ALIAS targets instead in cases where the goal is to refer to targets by another name.
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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