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Date:   Mon, 12 Oct 2020 10:05:41 +0200
From:   Arnd Bergmann <>
To:     Masahiro Yamada <>
Cc:     Andrew Lunn <>,
        Nick Desaulniers <>,
        netdev <>,
        David Miller <>,
        Jakub Kicinski <>,
        Michal Marek <>,
        Rohit Maheshwari <>,
        Linux Kbuild mailing list <>,
        clang-built-linux <>
Subject: Re: [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1
 warnings for today

On Mon, Oct 12, 2020 at 3:00 AM Masahiro Yamada <> wrote:
> BTW, if possible, please educate me about the difference
> between -Wmissing-declarations and -Wmissing-prototypes.
> Do we need to specify both in W=1 ?
> If yes, what is the difference between them?

I think they do the same thing in the kernel, as we already set
 '-Wstrict-prototypes', which requires that there are no declarations
without having a prototype first. Adding either one should be sufficient.


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