If tuna is upgraded to the latest version of the buildfarm script it will report config output even on sucessful builds, which will contain gcc info. IE: http://lnk.nu/pgbuildfarm.org/5ii.pl (search for 'configure:2078').
She is apparently not. I can't find any stage logs in there. But thanks for the hint, I'll be sure to look for them in the future.
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