On 20 May 2016 at 07:05, Ville Voutilainen <ville.voutilainen@gmail.com> wrote:
> On 19 May 2016 at 19:40, Jason Merrill <jason@redhat.com> wrote:
>> Any thoughts on doing something similar for extern variable declarations?
>
> Ah, we diagnose local extern variable declarations that clash with
> previous declarations,
> but we don't diagnose cases where a subsequent declaration clashes
> with a previous
> local extern declaration. I'll take a look.

As discussed on irc, this requires teaching variable declarations to
work with DECL_ANTICIPATED
and is thus some amounts of surgery, so the recommendation was to go
ahead with this patch.
I added a comment to the new code block, an updated patch attached.
Changelog as before.
Ok for trunk?