Issue added as a result of discussion from https://issues.jenkins-ci.org/browse/JENKINS-6772.
In multi-configuration projects it would be preferable to have the warnings plugin show a different view for each matrix element. On the main page for the multi-configuration project we could have a aggregated view, showing the number of warnings for each matrix element.
One specific case would be when having different compiler versions on one axis, and operating systems on the other. It would then be interesting to see warnings for the compiler gcc 4.4.2 compiling the project on RHEL4, as well as the warnings for gcc 4.6.1 compiling the project on RHEL5. The aggregated view would then show number of warnings for gcc 4.4.2/RHEL4 and gcc 4.6.1/RHEL5 on the main page, and the subviews would show the actual warnings for each combination of gcc and OS on the subpage.
Let me know if I need to clarify further.