linux-kernel - Re: [PATCH] Makefile: Don't try to add '-fcatch-undefined-behavior' flag

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Date:   Thu, 9 May 2019 15:49:32 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] Makefile: Don't try to add '-fcatch-undefined-behavior' flag

On Thu, May 9, 2019 at 1:49 PM Nathan Chancellor
<natechancellor@...il.com> wrote:
>
> This is no longer a valid option in clang, it was removed in 3.5, which
> we don't support.
>
> https://github.com/llvm/llvm-project/commit/cb3f812b6b9fab8f3b41414f24e90222170417b4
>

Cool.

Can you test with -mglobal-merge (inverted -mno-global-merge) which is
default for Clang?
I could build, link and boot with my llvm-toolchain (incl. lld-9) on x86-64.

Maybe this is also no more needed?

Thanks.

- Sedat -

> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>
> Let me know if you want this incremental to your patch. I figured it
> made more sense to remove this then do the cc-option/cc-disable-warning
> removal because it will simplify the commit message.
>
>  Makefile | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index d24f5a8009ee..e4788eb2c9b9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -740,7 +740,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
>  # source of a reference will be _MergedGlobals and not on of the whitelisted names.
>  # See modpost pattern 2
>  KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
> -KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
>  else
>
>  # These warnings generated too much noise in a regular build.
> --
> 2.21.0
>
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