linux-kernel - Re: [PATCH] kbuild: fix W=1 with gcc 4.3.2

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Date:	Thu, 21 Apr 2011 23:13:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [PATCH] kbuild: fix W=1 with gcc 4.3.2

Le jeudi 21 avril 2011 à 23:08 +0200, Sam Ravnborg a écrit :
> Building a kernel using W=1 with gcc 4.3.2 failed like this:
> 
>     cc1: error: unrecognized command line option "-Wpacked-bitfield-compat"
> 
> Make use of this option dependent on the compiler.
> 
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Cc: Dave Jones <davej@...hat.com>
> ---
> I do not see this a stable material - people running stable kernels
> have less value of W=1.
> 
> And the amount of warnings are outright silly. We should really
> divide this up a bit so W=1 is semi usefull.
> 
> 	Sam
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index d5f925a..b280284 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -73,7 +73,7 @@ KBUILD_EXTRA_WARNINGS += -Wnested-externs
>  KBUILD_EXTRA_WARNINGS += -Wold-style-definition
>  KBUILD_EXTRA_WARNINGS += $(call cc-option, -Woverlength-strings,)
>  KBUILD_EXTRA_WARNINGS += -Wpacked
> -KBUILD_EXTRA_WARNINGS += -Wpacked-bitfield-compat
> +KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wpacked-bitfield-compat)
>  KBUILD_EXTRA_WARNINGS += -Wpadded
>  KBUILD_EXTRA_WARNINGS += -Wpointer-arith
>  KBUILD_EXTRA_WARNINGS += -Wredundant-decls
> --

Please add same fix for gcc-4.1.2

cc1: error: unrecognized command line option "-Wlogical-op"





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