[Bug lto/48538] GCC build fails with -flto in BOOT_CFLAGS

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48538

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-04-10 11:52:02 UTC ---
(In reply to comment #2)
> Ok. In the documentation it said that was equivalent to -flto in BOOT_CFLAGS,
> that's why I used it.
> Now I've checked bootstrap-lto.mk and looks like it disables lto when doing a
> profiled bootstrap. Is it right? I wonder what gives better performance: lto or
> profiled-driven optimizations...

It disables LTO during the profile instrumented stage to speed up the
compile of that.  The final executables are still built with profile
feedback and LTO.