[PATCH v4] Fix -Os related build and test failures.

[Joseph Myers]

On Tue, 1 Nov 2016, Andreas Schwab wrote:

> On Okt 30 2016, Carlos O'Donell <carlos@redhat.com> wrote:
> 
> > diff --git a/resolv/res_send.c b/resolv/res_send.c
> > index 6d46bb2..4ec8c1a 100644
> > --- a/resolv/res_send.c
> > +++ b/resolv/res_send.c
> > @@ -664,7 +664,7 @@ send_vc(res_state statp,
> >  	   a false-positive.
> >  	 */
> >  	DIAG_PUSH_NEEDS_COMMENT;
> > -	DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
> > +	DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
> >  	int resplen;
> >  	DIAG_POP_NEEDS_COMMENT;
> >  	struct iovec iov[4];
> 
> That breaks powerpc and s390.
> 
> res_send.c: In function 'send_vc':
> res_send.c:668:6: error: 'resplen' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>   int resplen;
>       ^~~~~~~

And the other change to the same file introduces a new use of 
DIAG_IGNORE_NEEDS_COMMENT with a comment that only mentions -Os.  Was the 
intent to edit the latter use to be DIAG_IGNORE_Os_NEEDS_COMMENT, with the 
former one edited by mistake instead?

-- 
Joseph S. Myers
joseph@codesourcery.com