http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52674
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-03-23 21:30:26 UTC --- > I was doing profiledbootstrap with the bootstrap-lto config on x64 just fine > until about 6 weeks ago. The speedup in the resulting binary was notable, and > was very useful to have for my shorter gcc build iterations where I use > --disable-bootstrap. If it's not supposed to work, then configure should not > allow it IMO. The speedup comes the profiled bootstrap, LTO doesn't add much. The average user isn't supposed to use --with-build-config, it's mainly for GCC developers. > If you can recommend an intermediate make target I can use to make the > iteration time shorter, I can try and debug this issue further on my own and > report back. I can't figure out how to capture the resulting binary that > crashes, since the source isn't listed in the config.log when it fails, so any > help on that front would be appreciated. Right, debugging LTO is a pain. Do not waste your time on this I'd say, just do a simple profiled bootstrap.
