linux-kernel - Re: [PATCH 1/3] kbuild: add -Wno-pointer-sign flag unconditionally

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Date:   Mon, 1 Oct 2018 10:24:42 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kbuild: add -Wno-pointer-sign flag unconditionally

On Mon, Oct 1, 2018 at 2:45 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> We have raised the compiler requirement from time to time.
> With commit cafa0010cd51 ("Raise the minimum required gcc version
> to 4.6"), the minimum for GCC is 4.6 now.
>
> The -Wno-pointer-sign has been here since the pre-git era.  It is
> documented in the GCC 4.6 manual, and it is recognized by Clang
> and ICC as well.
>
> Let's rip off the cc-disable-warning switch, and see if somebody
> complains about it.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
>  Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index c6d1f2f..505a324 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -800,7 +800,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
>  KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
>
>  # disable pointer signed / unsigned warnings in gcc 4.0
> -KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
> +KBUILD_CFLAGS += -Wno-pointer-sign

Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
https://godbolt.org/z/7vpHIf

>
>  # disable stringop warnings in gcc 8+
>  KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
> --
> 2.7.4
>


-- 
Thanks,
~Nick Desaulniers