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- CMP0040
- -------
- The target in the ``TARGET`` signature of :command:`add_custom_command`
- must exist and must be defined in the current directory.
- CMake 2.8.12 and lower silently ignored a custom command created with
- the ``TARGET`` signature of :command:`add_custom_command`
- if the target is unknown or was defined outside the current directory.
- The ``OLD`` behavior for this policy is to ignore custom commands
- for unknown targets. The ``NEW`` behavior for this policy is to report
- an error if the target referenced in :command:`add_custom_command` is
- unknown or was defined outside the current directory.
- This policy was introduced in CMake version 3.0. CMake version
- |release| warns when the policy is not set and uses ``OLD`` behavior.
- Use the :command:`cmake_policy` command to set it to ``OLD`` or
- ``NEW`` explicitly.
- .. include:: DEPRECATED.txt
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