[PATCH] Fix PR83452

[Rainer Orth]

Hi Richard,

> The following enables a hpux specific workaround for the WEAK UNDEF
> symbols used by LTO debuginfo extraction.  It makes sure to use
> a special name (gnu_lto_v1) for those.
>
> It also adjusts removed local symbols to not use UNDEFs (similar
> to solaris ld for globals hpux doesn't like undefs it cannot resolve even
> if they are unused).  Instead it uses DEFS with NULL name.
>
> I also fixed some readelf complaints about stale sh_info/link in
> removed sections.  (maybe that fixes the solaris complaints? ... just
> having some christmas wishes ;))

unfortunately, Santa doesn't grant all our wishes ;-)

> LTO Bootstrapped and tested on x86_64-unknown-linux-gnu.
>
> I've tested GNU ld and gold for a simple testcase exercising multiple
> WEAK UNDEFs with the same name and local defs, they seem happy
> (but they also retain all those local defs now in the partial link ... :/)
>
> I'll probably see to implement "real" section removal in stage3 to
> fix the Solaris complaints but I hope to not need reloc section
> rewriting (aka really pruning stuff from the symtab).

I've tested all of unmodified mainline, trunk + current pr81968 patch,
and trunk + this one last night on i386-pc-solaris2.11 and
sparc-sun-solaris2.11.  There's no difference between results with and
without this patch, while the pr81968 (which I've been keeping in my
tree for quite some time) does help quite a bit, but several errors
remain.

	Rainer
 
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Rainer Orth, Center for Biotechnology, Bielefeld University