netdev - Re: [PATCH net-next v2 1/2] Makefile.extrawarn: Add symbol for W=1 warnings for today

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Date:   Mon, 12 Oct 2020 10:05:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Rohit Maheshwari <rohitm@...lsio.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
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 <masahiroy@...nel.org> 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.

      Arnd