Does anybody actually cares about warnings from a non-GNUC compiler?
Neat, we can remove 90% of the autotools test crap :-)
Note that I'm saying "*about warnings* form a non-GNUC compiler", not that we shouldn't *build* fine with any random compliant compiler -- which we definitely should (I'm gonna add "in the bounds of the reasonable" before anybody finds a silly compiler nobody uses that doesn't support a silly thing all others do just to prove me wrong -- although I'd be happy to try and fix it if it's a compliance issue reasonably easy to fix anyway).