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Are you using the messages when you build your code? If yes, they're a build dependency.

Are you using the messages when you run your code? If yes, they're a run-time dependency.

This question and answer has a more in-depth discussion: http://answers.ros.org/question/238900/should-cc-packages-run_depend-on-_msgs-packages/

Are you using the messages when you build your code? If yes, they're a build dependency.

Are you using the messages when you run your code? If yes, they're a run-time dependency.

It is perfectly fine to have a package as both a build and run-time dependency.

This question and answer has a more in-depth discussion: http://answers.ros.org/question/238900/should-cc-packages-run_depend-on-_msgs-packages/