Patch for Friend function linkage check (PR 15841)

[John McCall]

On Apr 25, 2013, at 7:30 AM, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
>> Linkage specifications don't actually have members under the standard.
>> Instead, they just set the language linkage of any non-class-member name
>> declared therein that has external linkage.  That would seem to apply to
>> a friend declaration.
> 
> I see, it is just a difference on how the standard is written and how
> clang is implemented. Is something like the attached patch what we
> need?

I'd just tweak the loop immediately above to separately remember the
DC to declare the entity in.

John.