[Bug bootstrap/81926] go/parse.o differs between stage2 and stage3

["dclarke at blastwave dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81926

--- Comment #20 from Dennis Clarke <dclarke at blastwave dot org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #17)
> > --- Comment #16 from Dennis Clarke <dclarke at blastwave dot org> ---
> > This is excellent follow up ...

> > Here is the diff on 7.2.0 gcc/config/sparc/sparc.c based on your patch :
> 
> Thanks.  Before trying a backport, we probably should go for the
> different solution Richard suggested, though.

Please see my question below.

> 
> > I do have GNU objcopy laying about also : 
> >
> > v9_7++ $ /usr/local/bin/gobjcopy --version 
> > GNU objcopy (GNU Binutils) 2.23.1
> > Copyright 2012 Free Software Foundation, Inc.
> > This program is free software; you may redistribute it under the terms of
> > the GNU General Public License version 3 or (at your option) any later version.
> > This program has absolutely no warranty.
> 
> This won't help right now: libgo's configure will only look for objcopy
> (or sparc64-sun-solaris2.10-objcopy in your case) and doesn't know about
> gobjcopy.
> 

yikes ... however see info below.

> AFAICS toplevel configure checks for the g-prefixed tools and passes the
> result to gcc/configure which heeds them, while libgo/configure does
> not.
> 
> Probably an issue for a separate libgo bug report.
> 
> 	Rainer

Just a bit of info and a question. 

info : I have set the env var OBJCOPY=/usr/local/bin/gobjcopy and
       also set env var OBJDUMP=/usr/local/bin/gobjdump where both
       those tools exist and are from binutils 2.23.1


ques : Richard Bierner had said earlier "I'd rather do that where the
       assemby_start debug hook is called instead..." however I already 
       applied Rainer's patch to gcc/config/sparc/sparc.c and am running
       a stage3 bootstrap now. Should that change have been done elsewhere
       other than in a sparc specific target related source?