1) If you're concerned about building proprietary software with a recently open sourced compiler - might want to look elsewhere for help. IANAL and IANYL
2) If you're brittle - might want to unplug now
3) I don't like the guy
4) License issues in general waste time - No discussion needed - point them at the license and tell them to go help themselves.

It wasn't a bad day, but I'd like to set a precedent for the reaction to licensing questions. (Admittedly a FAQ on this wouldn't hurt) There are numerous pro bono and paid legal services which are the appropriate place to ask. A professional building high quality proprietary software wouldn't ever ask this on irc. If he had said *open source* software I'd have cut him some slack.