netdev - Re: GCC 12 warnings

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Date:   Fri, 20 May 2022 16:30:52 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Jakub Kicinski' <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: GCC 12 warnings

On Fri, May 20, 2022 at 09:43:03PM +0000, David Laight wrote:
> From: Jakub Kicinski
> > Sent: 20 May 2022 18:24
> ...
> > > +ifeq ($(KBUILD_EXTRA_WARN),)
> > > +CFLAGS_kvaser_usb_hydra.o += -Wno-array-bounds
> > > +endif
> > 
> > Ah, thanks, I must have tried -Wno-array-bounds before I figured out
> > the condition and reverted back to full $(call cc-disable-warning, ..)
> > Let me redo the patches.
> 
> I think you need a check that the compiler actually supports
> -Wno-array-bounds.
> But that only needs be done once, not for every file
> that needs the option.

godbolt tells me that all kernel supported versions of GCC and Clang
handle -Wno-array-bounds. Let me know if there is a combination that
doesn't?

-- 
Kees Cook