http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51315
--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> 2011-11-29 10:18:00 UTC --- I suspect it's a dupe of PR50569 or PR50444. (And if you hate alignment bugs like me you might also want to know about the 4.5-only PR46483.)