[patch libgcc]: Adjust cygming-crtbegin code to use weak

[Dave Korn]

On 22/03/2013 08:44, Kai Tietz wrote:
> Hi,
> 
> this change is actual used by cygwin and is required for upcoming x64
> cygwin target.
> 
> ChangeLog
> 
> 2013-03-22  Kai Tietz  <ktietz@redhat.com>
> 
> 	* config/i386/cygming-crtbegin.c (__register_frame_info): Make weak.
> 	(__deregister_frame_info): Likewise.
> 
> Tested for i686-pc-cygwin, and x86_64-pc-cygwin.  I will apply this
> code tomorrow if there are no objections by other
> Windows-target-maintainers.


  I don't think the ChangeLog entry is right; it doesn't make the declarations
weak, it supplies definitions.

  Also, can you explain the motivation for this change?  I don't see how it's
going to work right; from what I remember, we don't have weak definitions in
PE-COFF, just weak references.  How does the correct definition get chosen
when we may have two definitions in a final link?

    cheers,
      DaveK