linux-kernel - Re: [PATCH] kbuild: add -Wvla flag unconditionally

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Date:   Thu, 9 May 2019 04:16:03 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        clang-built-linux@...glegroups.com,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: add -Wvla flag unconditionally

On Thu, May 09, 2019 at 03:45:49PM +0900, Masahiro Yamada wrote:
> This flag is documented in the GCC 4.6 manual, and recognized by
> Clang as well. Let's rip off the cc-option switch.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
> 
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index c71ffb6f55b5..3f5e8a0f4561 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -841,7 +841,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
>  KBUILD_CFLAGS += -Wdeclaration-after-statement
>  
>  # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
> -KBUILD_CFLAGS += $(call cc-option,-Wvla)
> +KBUILD_CFLAGS += -Wvla
>  
>  # disable pointer signed / unsigned warnings in gcc 4.0
>  KBUILD_CFLAGS += -Wno-pointer-sign
> -- 
> 2.17.1
>