.... I did this manually when I ran the build tests myself: I just kept the last good test log and diff'ed the current test log with that known good log. Any new warnings would show up in the diffs. The tricky part is that there is a lot of other kruft that shows up in the diffs too like data differences and line number differences
Perhaps you could use grep -c ": warning:" and if the count is larger in the new log, then there are new warnings?
