How to show warning diff compared to latest master commit for all builds

[estan]

Our CI submits build results for all commits on all branches to our CDash.

I'm trying to figure out how to make CDash show the warnings diff for every build, compared to the latest commit on our master branch, both in terms of +/- number of warnings, but also which new warnings were introduced (if any).

Is this possible?

[zackgalbreath]

Currently CDash shows diffs based on the "previous build". I like your idea of comparing them to a "known good" baseline build instead. I'll leave this issue open as a feature request.