Since AUTHOR_WARNING is a superset of DEPRECATION_WARNING I think -W[no-]dev can influence CMAKE_WARN_DEPRECATED. Please also add -W[no-]error=dev to turn AUTHOR_WARNING into an error and also make it influence CMAKE_ERROR_DEPRECATED. Then -Wdeprecated and friends can still be used to control the DEPRECATION messages separately.
Making dev influence deprecation variables is not a problem. To support -Werror=dev we'll need a new variable I'm thinking though, something like a boolean CMAKE_SUPPRESS_DEVELOPER_ERRORS?
What should be the expected behaviour when combining dev and deprecated now, as they affect each other. If for example the user used the options "-Wno-deprecated -Wdev" in a cmake invocation, the most logical to me would be that this causes CMAKE_SUPPRESS_DEVELOPER_WARNINGS to be TRUE and CMAKE_WARN_DEPRECATED to be FALSE, but implementing that might make the code more complicated than I'd hoped.
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