http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48679
--- Comment #7 from Mikael Pettersson <mikpe at it dot uu.se> 2011-05-16 12:17:45 UTC --- The bootstrap comparison failure appears to be gone in a c-only build of gcc-4.7-20110514. I'll run a bisect to identify which rev fixed this bug.