linux-kernel - Re: [PATCH] kbuild: Add -Werror=unknown-warning-option to CLANG

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Date:   Tue, 11 Jun 2019 12:37:35 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Peter Smith <peter.smith@...aro.org>
Subject: Re: [PATCH] kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS

On Tue, Jun 11, 2019 at 11:43 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
> Suggested-by: Peter Smith <peter.smith@...aro.org>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

I verified this has no negative effect with -Qunused-arguments and the
relative position of the two flags.  The build failure is much more
explicit with this patch:
> error: unknown warning option '-Wno-psabi' [-Werror,-Wunknown-warning-option]

Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  Makefile | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Makefile b/Makefile
> index b81e17261250..5f9d09bd2252 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -528,6 +528,7 @@ ifneq ($(GCC_TOOLCHAIN),)
>  CLANG_FLAGS    += --gcc-toolchain=$(GCC_TOOLCHAIN)
>  endif
>  CLANG_FLAGS    += -no-integrated-as
> +CLANG_FLAGS    += -Werror=unknown-warning-option
>  KBUILD_CFLAGS  += $(CLANG_FLAGS)
>  KBUILD_AFLAGS  += $(CLANG_FLAGS)
>  export CLANG_FLAGS
> --
> 2.22.0
>


-- 
Thanks,
~Nick Desaulniers