http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48835
--- Comment #25 from Mikael Pettersson <mikpe at it dot uu.se> 2011-07-16 13:20:49 UTC --- The first 4.6.1 bootstrap attempt failed at the very first Ada compilation step in stage 3, with a SEGV in gnat1 when compiling ada/a-charac.ads. This was with a straight forward-port of the working 4.5.3 patch. I'll keep digging...