I believe the way buildbot lists C warnings is by grepping the stdout
of the compile step for the word "warning".
Here's the source of WarningCountingShellCommand, which
CompileCommand subclasses:
http://buildbot.net/trac/browser/buildbot/steps/shell.py?rev=#L279
Therefore, it should already work for ghc if ghc's warning messages
match the same pattern.
Regards,
Zooko
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