linux-kernel - Re: [PATCH 1/4] Adds -Wshadow=local on KBUILD

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Message-ID: <CAK7LNASVn7CB5uL9tCtNC2u4Ary5eb-vyiB_sS2ey5AZNweKAA@mail.gmail.com>
Date:   Wed, 17 Oct 2018 17:21:01 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Leonardo Brás <leobras.c@...il.com>,
        lkcamp@...ts.libreplanetbr.org, willy6545@...il.com,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 1/4] Adds -Wshadow=local on KBUILD_HOSTCFLAGS

On Wed, Oct 17, 2018 at 5:11 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Tue, Oct 16, 2018 at 09:08:09PM -0300, Leonardo Brás wrote:
> > Adds -Wshadow=local on KBUILD_HOSTCFLAGS to show shadow warnings
> > on tools built for HOST.
> >
> > Signed-off-by: Leonardo Brás <leobras.c@...il.com>
> > ---
> >  Makefile | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/Makefile b/Makefile
> > index e8b599b4dcde..fb0a9ac195e7 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -360,7 +360,7 @@ HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
> >
> >  HOSTCC       = gcc
> >  HOSTCXX      = g++
> > -KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
> > +KBUILD_HOSTCFLAGS   := -Wall -Wshadow=local -Wmissing-prototypes -Wstrict-prototypes -O2 \
> >               -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
> >               $(HOSTCFLAGS)
> >  KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
> > --
>
> You might wanna take a look at scripts/Makefile.extrawarn which already
> has -Wshadow.


scripts/Makefile.extrawarn provides options for the target compiler (CC),
whereas this patch adds -Wshadow=local for the host compiler (HOSTCC).



-- 
Best Regards
Masahiro Yamada