linux-kernel - Re: [PATCH 1/3] kbuild: Remove -Wno-format-invalid-specifier from clang block

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Date:   Mon, 16 Aug 2021 14:39:39 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH 1/3] kbuild: Remove -Wno-format-invalid-specifier from
 clang block

On Mon, Aug 16, 2021 at 1:21 PM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Turning on -Wformat does not reveal any instances of this warning across
> several different builds so remove this line to keep the number of
> disabled warnings as slim as possible.
>
> This has been disabled since commit 61163efae020 ("kbuild: LLVMLinux:
> Add Kbuild support for building kernel with Clang"), which does not
> explain exactly why it was turned off but since it was so long ago in
> terms of both the kernel and LLVM so it is possible that some bug got
> fixed along the way.
>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

I ran a few builds with this patch applied and didn't spot any
instances of this warning. We can always bring it back if necessary.
Thanks for the patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>  Makefile | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 891866af0787..3900f5824721 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -777,7 +777,6 @@ KBUILD_CFLAGS += $(stackp-flags-y)
>
>  ifdef CONFIG_CC_IS_CLANG
>  KBUILD_CPPFLAGS += -Qunused-arguments
> -KBUILD_CFLAGS += -Wno-format-invalid-specifier
>  KBUILD_CFLAGS += -Wno-gnu
>  # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
>  # source of a reference will be _MergedGlobals and not on of the whitelisted names.
>
> base-commit: f12b034afeb3a977bbb1c6584dedc0f3dc666f14
> --
> 2.33.0.rc2
>


-- 
Thanks,
~Nick Desaulniers