Re: [PATCH] kbuild: Do not enable -Wimplicit-fallthrough for clang for now

[Masahiro Yamada]

On Thu, Aug 29, 2019 at 2:44 AM Nick Desaulniers
<ndesaulniers@xxxxxxxxxx> wrote:
>
> On Wed, Aug 28, 2019 at 10:39 AM Nick Desaulniers
> <ndesaulniers@xxxxxxxxxx> wrote:
> >
> > On Wed, Aug 28, 2019 at 9:45 AM Miguel Ojeda
> > <miguel.ojeda.sandonis@xxxxxxxxx> wrote:
> > >
> > > On Wed, Aug 28, 2019 at 6:21 PM Masahiro Yamada
> > > <yamada.masahiro@xxxxxxxxxxxxx> wrote:
> > > >
> > > > Applied to linux-kbuild. Thanks.
> > > >
> > > > (If other clang folks give tags, I will add them later.)
> > >
> > > Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
> >
> > I verified that GCC didn't get support for -Wimplicit-fallthrough
> > until GCC ~7.1 release, so the cc-option guard is still required.
> > Acked-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> > Thanks for the patch Nathan.
>
> Also, there's an inconsistency between Makefile vs
> scripts/Makefile.extrawarn that's been bugging me: it seems we enable
> GCC only flags in Makefile, then disable certain Clang flags in
> scripts/Makefile.extrawarn.


All the flags listed in scripts/Makefile.extrawarn depend on W= option.
The options in Makefile are passed irrespective of W=.

There is no inconsistency.


> Not necessary to fix here and now, but I
> hope one day to have one file that has all of the compiler specific
> flags in one place (maybe its own file), so I only have to look in one
> place.  I know, I know, "patches welcome." ;)
>
> --
> Thanks,
> ~Nick Desaulniers



-- 
Best Regards
Masahiro Yamada