Re: [patch by Michael Matz] Re: archer gdb and gcc 4.1 global namespaceDIE

[Sami Wagiaalla <swagiaal at redhat dot com>]

Hi Richard,

Thanks for the bug and the patch.

This problem is due to the fact that in Archer we are using 
dwarf2_full_name instead of dwarf2_linkage_name.

I am trying your patch but it does not seem to have solved the problem 
for me. Are you testing against the Archer fedora branch ( 
archer-jankratochvil-fedora-merge ) ?

Sami

Jan Kratochvil wrote:
> Hi Sami,
>
> sending a followup with patch I got.
>
>
> Regards,
> Jan
>
>
> ------------------------------------------------------------------------
>
> Subject:
> Support bogus global namespace emitted by g++ 4.1
> From:
> Michael Matz <matz@suse.de>
> Date:
> Wed, 13 May 2009 16:44:53 +0200 (CEST)
> To:
> Jan Kratochvil <jan.kratochvil@redhat.com>
>
> To:
> Jan Kratochvil <jan.kratochvil@redhat.com>
> CC:
> Richard Guenther <rguenther@suse.de>
>
>
> Hi,
>
> (it's my understanding that Richard already mentioned this, but anyway)
> due to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28460 some old G++ emit 
> an explicit namespace declaration for the global namespace for some decls.  
> This is bogus and indeed confuses gdb (not the current CVS it seems, but 
> the archer branch at least).  Unfortunately we now have to deal with this 
> in gdb as the bogus debug info is already out there.
>
> So, here's a patch for that.  I saw two options:
> (1) hacking determine_prefix to return "" when it was just about to
>     return "::" for namespaces.
> (2) not even linking that bogus namespace DIE into its children
>
> It seems to me that option (2) is slightly more clear, so that's what I've 
> chosen.  It works with the simple testcases I have using global decls.
>
> Let me know what you think.
>
>
> Ciao,
> Michael.