Il 18/11/2013 20:09, Jan Hubicka ha scritto: >>> > > this patch switches the default for fat-lto-objects as was documented >>> > > for a while. >>> > > -ffat-lto-objects doubles compilation time and often makes users to not >>> > > notice that >>> > > LTO was not used at all (because they forgot to use gcc-ar/gcc-nm >>> > > plugins). >>> > > >>> > > Sadly I had to add -ffat-lto-objects to bootstrap. This is because I do >>> > > not know >>> > > how to convince our build machinery to use gcc-ar/gcc-nm during the >>> > > stage2+ >> > >> > I've posted a minimal patch set for slim-lto-bootstrap last year, see: >> > http://thread.gmane.org/gmane.comp.gcc.patches/270842 >> > >> > If there's interest I could repost it. > It would be really nice to have it in indeed. I think we do not really need > lto-bootstrap.mk and slim-lto-bootstrap.mk, but otherwise the patch seems easy > enough and would save quite some of lto bootstrap testing time...
Patches 1 and 2 should go upstream first. Patch 3 in the series is wrong because Makefile.in is a generated file. The message does not explain why it is necessary, and it is probably working around a bug elsewhere. For patch 4, I agree with Jan that we do not need a separate configuration. Paolo
