PR libgcc/78064: Add missing include directive to unwind-c.c

[Jakub Jelinek]

On Fri, Oct 21, 2016 at 12:14:50PM +0200, Florian Weimer wrote:
> See
> 
>   https://gcc.gnu.org/ml/gcc/2016-10/msg00165.html
> 
> for the background.  This causes pthread_cond_wait in glibc to write out of
> bounds on i386.
> 
> Fix was suggested by Jim Wilson.
> 
> Tested on x86_64-redhat-linux-gnu, with no new regressions.  Also tested
> against the i386 glibc reproducer, and verified that _Unwind_GetIPInfo is
> called from the __gcc_personality_v0.
> 
> Okay for trunk?

Ok, thanks.

> We probably should backport this to all active branches as well.  The risk
> is fairly low because the C unwinder personality is rarely used (Eric
> Botcazou pointed out that the C++ and Ada personalities are not affected by
> this).

I think it is ok to backport say after 14 days on the trunk (of course only
to still supported branches, 5/6).

> 2016-10-21  Florian Weimer  <fweimer@redhat.com>
> 
> 	PR libgcc/78064
> 	* unwind-c.c: Include auto-target.h.

	Jakub