-G0

Franz Sirl Franz.Sirl-kernel@lauterbach.com
Tue Feb 22 08:06:00 GMT 2000


At 16:50 22.02.00 , H . J . Lu wrote:
>On Tue, Feb 22, 2000 at 04:24:08AM -0800, Jack Howarth wrote:
> > HJ,
> >    Do you have any idea why emacs needs -G0 when built on the ppc?
> > It seems that depending on the version of emacs being built we get
> > away with not including the -G0 option in the CFLAGS and LD_FLAGS.
> > For instance they seem to have been able to leave it out of the
> > emacs 20.4 srpm ported from redhat-6.1. However when I ported the
> > emacs 20.5 srpm from the current rawhide srpms (using the same three
> > ppc-specific patches from our Linuxppc Reference Release 1.1 emacs
> > srpm) emacs segfaults during the build process unless I add the
> > -G0 flag. Is linker optimization this flakey on any other platforms?
> > I assume this would be fixed in binutils right? It should go on the
> > list of ppc-specific linker problems to be fixed. Thanks.
> >                    Jack
>
># ld -help
>-G SIZE, --gpsize SIZE      Small data size (if no size, same as --shared)
>
>I guess ld does something wrong when optimizing small data using
>the GP register. There may be a limit. Emacs exceeds the limit and
>linker doesn't check it.

H.J., don't bother with this one. emacs undump just can't handle small data 
sections on powerpc-linux-gnu and I strongly doubt anyone currently can 
build a emacs without -G0 in the gcc options.

Franz.



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