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Subject: Re: [PATCH] doc: use KCFLAGS instead of EXTRA_CFLAGS to pass flags
 from command line
To:     Masahiro Yamada <masahiroy@kernel.org>,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org
Cc:     Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
        Federico Vaga <federico.vaga@vaga.pv.it>,
        Harry Wei <harryxiyou@gmail.com>, Jyri Sarha <jsarha@ti.com>,
        Tomi Valkeinen <tomi.valkeinen@ti.com>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
References: <20210221152524.197693-1-masahiroy@kernel.org>
From:   Alex Shi <alex.shi@linux.alibaba.com>
Message-ID: <b1d148cf-5264-54c7-1b6a-b0b4a5e866a1@linux.alibaba.com>
Date:   Mon, 22 Feb 2021 13:05:54 +0800
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Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>


在 2021/2/21 下午11:25, Masahiro Yamada 写道:
> You should use KCFLAGS to pass additional compiler flags from the
> command line. Using EXTRA_CFLAGS is wrong.
> 
> EXTRA_CFLAGS is supposed to specify flags applied only to the current
> Makefile (and now deprecated in favor of ccflags-y).
> 
> It is still used in arch/mips/kvm/Makefile (and possibly in external
> modules too). Passing EXTRA_CFLAGS from the command line overwrites
> it and breaks the build.
> 
> I also fixed drivers/gpu/drm/tilcdc/Makefile because commit 816175dd1fd7
> ("drivers/gpu/drm/tilcdc: Makefile, only -Werror when no -W* in
> EXTRA_CFLAGS") was based on the same misunderstanding.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
> 
>  Documentation/process/4.Coding.rst                            | 2 +-
>  Documentation/process/submit-checklist.rst                    | 2 +-
>  Documentation/translations/it_IT/process/4.Coding.rst         | 2 +-
>  Documentation/translations/it_IT/process/submit-checklist.rst | 2 +-
>  Documentation/translations/zh_CN/process/4.Coding.rst         | 2 +-
>  drivers/gpu/drm/tilcdc/Makefile                               | 2 +-
>  6 files changed, 6 insertions(+), 6 deletions(-)
>