Re: [committed] c: C2x removal of unprototyped functions

[Richard Biener <richard.guenther@gmail.com>]

On Thu, Sep 1, 2022 at 11:18 PM Jeff Law via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
>
>
> On 9/1/2022 1:12 PM, Joseph Myers wrote:
> > C2x has completely removed unprototyped functions, so that () now
> > means the same as (void) in both function declarations and
> > definitions, where previously that change had been made for
> > definitions only.  Implement this accordingly.
> >
> > This is a change where GNU/Linux distribution builders might wish to
> > try builds with a -std=gnu2x default to start early on getting old
> > code fixed that still has () declarations for functions taking
> > arguments, in advance of GCC moving to -std=gnu2x as default maybe in
> > GCC 14 or 15; I don't know how much such code is likely to be in
> > current use.
> Happy to see this happen (dropping unprototyped funtions).  IIRC older
> versions of autoconf are going to generate code that runs afoul of this
> problem as well.

To catch these cases with a diagnostic earlier is
-Wstrict-prototypes -Wold-style-declaration enough to diagnose all cases
that the new standard will reject?

I suppose -W*-c2x-compat are not the correct vehicle to diagnose these?

Thanks,
Richard.

>
> jeff
>