elf backend hide_symbol bug

[Bob Wilson]

Alan Modra wrote:
> See http://sources.redhat.com/bugzilla/show_bug.cgi?id=293 for my
> analysis of this problem.  mips, cris, xtensa maintainers should
> note that there may be a similar problem for their ports.  The
> backend hide_symbol functions can be called when the plt and got
> unions are used as refcounts, eg. from bfd_elf_link_add_symbols,
> and also when the field may be used as an offset/pointer, eg. from
> _bfd_elf_adjust_dynamic_symbol.
> 
> 	PR 293
> 	* elf32-hppa.c (elf32_hppa_hide_symbol): Use init_refcount to
> 	"zero" the plt field.
> 

I think the Xtensa port is OK -- it never uses the offset portion of the union 
and also ignores refcounts of -1.  I'm not completely certain, though, so I'll 
keep an eye out for problems in this area.  Thanks for the warning, Alan.

--Bob