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From: Doug Anderson <dianders@chromium.org>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <mmarek@suse.com>,
	linux-kbuild@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Grant Grundler <grundler@chromium.org>,
	Greg Hackmann <ghackmann@google.com>,
	Michael Davidson <md@google.com>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH 2/2] kbuild: clang: Disable the 'duplicate-decl-specifier' warning
Date: Tue, 16 May 2017 14:41:18 -0700	[thread overview]
Message-ID: <CAD=FV=XENNp3rcD5OK1d2WmccbqaT9=bjsayvbnA2Th8zmOAwg@mail.gmail.com> (raw)
In-Reply-To: <20170421213931.155210-3-mka@chromium.org>

Hi

On Fri, Apr 21, 2017 at 2:39 PM, Matthias Kaehlcke <mka@chromium.org> wrote:
> clang generates plenty of these warnings in different parts of the code.
> They are mostly caused by container_of() and other macros which declare
> a "const <type> *" variable for their internal use which triggers a
> "duplicate 'const' specifier" warning if the <type> is already const
> qualified.
>
> Wording-mostly-from: Michael Davidson <md@google.com>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> ---
>  Makefile | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Makefile b/Makefile
> index df5abf346354..6cd6d428db43 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -704,6 +704,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
>  KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
>  KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
>  KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
> +KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
>  # Quiet clang warning: comparison of unsigned expression < 0 is always false
>  KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
>  # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the

It seems like gcc 7 may have the same warning.  Specifically I saw a
patch fly by from Arnd, which you can find in Mark Brown's tree now:

https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?h=topic/rt5614&id=03ba791df98d15d07ea74075122af71e35c7611c


+Arnd since he may be trying to solve the same issues?

-Doug

  parent reply	other threads:[~2017-05-16 21:41 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-21 21:39 [PATCH 0/2] kbuild: clang: Disable spurious warnings Matthias Kaehlcke
2017-04-21 21:39 ` [PATCH 1/2] kbuild: clang: Disable 'address-of-packed-member' warning Matthias Kaehlcke
2017-04-30 13:59   ` Masahiro Yamada
2017-05-02  1:23     ` Matthias Kaehlcke
2017-05-06 16:52       ` Masahiro Yamada
2017-05-08 23:18         ` Matthias Kaehlcke
2017-05-16  6:31           ` Masahiro Yamada
2017-05-16 21:32   ` Doug Anderson
2017-06-22  1:19     ` Masahiro Yamada
2017-04-21 21:39 ` [PATCH 2/2] kbuild: clang: Disable the 'duplicate-decl-specifier' warning Matthias Kaehlcke
2017-04-30 14:01   ` Masahiro Yamada
2017-05-04 19:50     ` Matthias Kaehlcke
2017-05-08  8:29       ` Masahiro Yamada
2017-05-16 21:41   ` Doug Anderson [this message]
2017-05-17  7:35     ` Arnd Bergmann
2017-05-17 18:45       ` Matthias Kaehlcke
2017-05-24  0:04         ` Matthias Kaehlcke
2017-05-24  8:21           ` Arnd Bergmann
2017-06-21  9:11             ` Masahiro Yamada
2017-06-21 10:11               ` Arnd Bergmann
2017-06-21 16:58                 ` Matthias Kaehlcke
2017-06-21 17:59                   ` Arnd Bergmann
2017-06-21 21:19                     ` Matthias Kaehlcke
2017-07-31 16:35                     ` Matthias Kaehlcke

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