Re: [patch c++]:PR/15774 - Conflicting function decls not diagnosed (this time really for 15774)

[Jason Merrill <jason at redhat dot com>]

On 12/24/2010 05:24 PM, Kai Tietz wrote:
> Ok, I'll apply it tomorrow. No the error message doesn't display the
> attribute as it displays a decl.  This would be possibly another task
> to display attributes (at least a wished limited set) also for
> declarations.

I think we want to print whatever attributes cause the attributed entity 
to be considered distinct from the non-attributed version, rather than a 
redeclaration.

Thinking about it that way, I think your patch actually isn't the right 
way to handle this: in pr15774-1.C, the two foos are the same foo, just 
the change in attributes is ill-formed.  So decls_match should return 1, 
but we should complain about attribute mismatch in duplicate_decls, 
perhaps just before the call to merge_decl_attributes.

Jason