https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21014
--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to dave from comment #5)
> Subject: Re: read-rtl.c:670: warning: missing sentinel in function call
>
> > result = concat ("(", cond1, ") && (", cond2, ")", NULL);
> >
> >
> > Looks like someone forgot the cast. (well in most of the time there is a
> > cast, oh well).
>
> It looks like this could be fixed by including stddef.h after stdio.h
> in system.h. stddef.h would then provide an appropriate define for NULL.
> Otherwise, stdio.h needs fixing. The define for NULL in system.h is
> also probably inadequate if it's ever needed.
>
> Dave
I see <stddef.h> already included in system.h
