linux-kernel - Re: [PATCH 3/3] kbuild: add -Werror=implicit-int flag unconditionally

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Message-ID: <CAKwvOd=YVMgaURxYb2J0aWN-5i_i6uRU-ot7JgO5GBPXvqakrw@mail.gmail.com>
Date:   Fri, 14 Dec 2018 10:26:10 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] kbuild: add -Werror=implicit-int flag unconditionally

On Fri, Dec 14, 2018 at 12:06 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> 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>

LGTM: https://godbolt.org/z/1Z3aG2
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
>  Makefile | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index bcb943e..b63699b 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -425,7 +425,7 @@ LINUXINCLUDE    := \
>  KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
>  KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
>                    -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
> -                  -Werror-implicit-function-declaration \
> +                  -Werror-implicit-function-declaration -Werror=implicit-int \
>                    -Wno-format-security \
>                    -std=gnu89
>  KBUILD_CPPFLAGS := -D__KERNEL__
> @@ -825,9 +825,6 @@ KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
>  # conserve stack if available
>  KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
>
> -# disallow errors like 'EXPORT_GPL(foo);' with missing header
> -KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
> -
>  # Prohibit date/time macros, which would make the build non-deterministic
>  KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
>
> --
> 2.7.4
>


-- 
Thanks,
~Nick Desaulniers