This is a followup to http://jira.codehaus.org/browse/MNG-3641. Refer to that issue for the background.
The current warning message is:
"Profile with id: '" + explicitProfileId + "' has not been activated."
I think this message is misleading, because the profile actually is activated - it's just not used at all in the pom being processed. I suggest changing the message to something like:
"Profile with id '" + explicitProfileId + "' is activated, but this pom does not contain any usages of the profile."
Also, I don't think it makes sense to print this warning at all in a multi-module build. In the large multi-module project I work on, we have a number of profiles that are only used in a handful of the 50 or so modules.