linux-kernel - Re: [PATCH] doc: use KCFLAGS instead of EXTRA

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Date:   Mon, 22 Feb 2021 13:13:30 +0100
From:   Federico Vaga <federico.vaga@...a.pv.it>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Harry Wei <harryxiyou@...il.com>, Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] doc: use KCFLAGS instead of EXTRA_CFLAGS to pass flags
 from command line

On 2021-02-21 16:25, Masahiro Yamada wrote:
> 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@...nel.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(-)

Acked-by: Federico Vaga <federico.vaga@...a.pv.it>

-- 
Federico Vaga
http://www.federicovaga.it/