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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Fri, 19 Oct 2018 11:41:31 +0900
Message-ID: <CAK7LNAQhbn-qZg_Bywk8rf0+oZhVbDjJ=PtcKGCL+k4Fp-ijSw@mail.gmail.com>
Subject: Re: [PATCH 1/4] Adds -Wshadow=local on KBUILD_HOSTCFLAGS
To:     Borislav Petkov <bp@alien8.de>
Cc:     =?UTF-8?Q?Leonardo_Br=C3=A1s?= <leobras.c@gmail.com>,
        lkcamp@lists.libreplanetbr.org,
        Matthew Wilcox <willy6545@gmail.com>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>
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On Fri, Oct 19, 2018 at 1:53 AM Borislav Petkov <bp@alien8.de> wrote:
>
> On Fri, Oct 19, 2018 at 01:39:21AM +0900, Masahiro Yamada wrote:
> > It is not realistic to enable this warning option by default.
>
> I believe the question is whether to enable that warning by default in
> KBUILD_HOSTCFLAGS. Enabling it by default for the target kernel is of
> course, too noisy. That's why it is hidden behind W=2 there.


Sorry, I misunderstood the question.

The difference about the noisiness between CC and HOSTCC
is just comes from the amount of source code.

Adding -Wshadow to KBUILD_HOSTCFLAGS emits another warning in Kconfig.
Of course, it is easy to fix.
But, I just started to think this option is a kind of harsh...


--
Best Regards
Masahiro Yamada