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Message-ID: <20230705162026.GA2951@dev-arch.thelio-3990X>
Date: Wed, 5 Jul 2023 09:20:26 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kbuild@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Enable -Wenum-conversion by default
On Wed, Jul 05, 2023 at 12:19:51AM +0200, Borislav Petkov wrote:
> From: "Borislav Petkov (AMD)" <bp@...en8.de>
>
> This diagnostic checks whether there is a type mismatch when
> converting enums (assign an enum of type A to an enum of type B, for
> example) and it caught a legit issue recently. The reason it didn't show
> is because that warning is enabled only with -Wextra with GCC. Clang,
> however, enables it by default.
>
> GCC folks were considering enabling it by default but it was too noisy
> back then:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78736
>
> Now that due to clang all those warnings have been fixed, enable it with
> GCC too.
>
> allmodconfig tests done with: x86, arm{,64}, powerpc{,64}, riscv
> crossbuilds.
>
> Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Yes please :)
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> ---
> Makefile | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 7a5a175f708f..428132b3d6dd 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1082,6 +1082,9 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
> # Require designated initializers for all marked structures
> KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
>
> +# Warn if there is an enum types mismatch
> +KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
> +
> # change __FILE__ to the relative path from the srctree
> KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
>
> --
> 2.41.0
>
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