[Bug bootstrap/62077] --with-build-config=bootstrap-lto fails,

["sven.c.dack at virginmedia dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62077

--- Comment #15 from Sven C. Dack <sven.c.dack at virginmedia dot com> ---
(In reply to Venkataramanan from comment #14)
> ...
> I tried addding to stage2/3 the flags "-flto=1 -flto-partition=none" instead
> of jobserver in bootstrap-lto.mk and spawned bootstrap LTO build in one
> amd64 machine. But still getting compare errors with GCC 4.9 branch. The
> HEAD is at revision 213070.

I have noticed a typo in one of my build scripts later this morning and am now
trying to verify the result. It is still not done yet. If it is indeed wrong
then I am going to take out the second patch.

I am also trying to use a "1to1" partition together with -flto=jobserver and
want to see if this makes a difference. This, too, is not done yet.

On a different note, I have managed to build a working compiler yesterday using
my compare-disassembly script with:

   --with-build-config=bootstrap-lto
   --with-boot-ldflags=-fuse-linker-plugin

I am still in the process of verifying it and running tests to see if I run
into any problems with it, but so far am I excited to have gotten this far.
gmp, mpfr and mpc have all been compiled with LTO enabled and have run their
testsuits without an error. I have tried pushing it further with "-fipa-pta
-fuse-liner-plugin", but ran out of memory (>16GB).