linux-kernel - Re: [PATCH] kbuild, LLVMLinux: Don't suppress format warnings

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Date:   Wed, 6 Feb 2019 09:45:28 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     jflat@...omium.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] kbuild, LLVMLinux: Don't suppress format warnings

On Tue, Feb 05, 2019 at 05:26:05PM +0900, Masahiro Yamada wrote:
> On Sat, Feb 2, 2019 at 6:10 AM <jflat@...omium.org> wrote:
> >
> > From: Jon Flatley <jflat@...omium.org>
> >
> > gcc produces format warnings that clang suppresses. To keep behavior
> > consistent between gcc and clang, don't suppress format warnings in
> > clang.
> >
> > Signed-off-by: Jon Flatley <jflat@...omium.org>
> > ---
> 
> Applied to linux-kbuild.
> Thanks.
> 
> 

Hi Jon and Masahiro,

Just as a heads up, this introduces a ton of warnings (duh). Isn't the
typical plan behind turning on warnings that were disabled to build with
'W=', fix them all, then turn them on so as not to pollute the build?

Log file: https://gist.github.com/443db156e56cd3c0f6b21d9d77728d80

Note a big chunk of them come from one scnprintf call in
include/linux/usb/wusb.h but still, there are many other warnings that
make quite a bit of noise. Some seem relatively easy to fix, which I
suppose I will try to tackle soon.

Thanks,
Nathan

> 
> 
> >  scripts/Makefile.extrawarn | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> > index 768306add591..94daf4e1fc73 100644
> > --- a/scripts/Makefile.extrawarn
> > +++ b/scripts/Makefile.extrawarn
> > @@ -68,7 +68,6 @@ else
> >  ifdef CONFIG_CC_IS_CLANG
> >  KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
> >  KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
> > -KBUILD_CFLAGS += $(call cc-disable-warning, format)
> >  KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
> >  KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
> >  KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
> > --
> > 2.20.1.611.gfbb209baf1-goog
> >
> 
> 
> -- 
> Best Regards
> Masahiro Yamada