linux-kernel - Re: [PATCH 1/7] Makefile, LLVM: add -no-integrated-as to KBUILD

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Message-ID: <CAK7LNAS0i=Qtoqk3hZMhAyQOXWf-8=fb0bSMh=gMJ3-bunQ_5Q@mail.gmail.com>
Date:   Fri, 21 Apr 2017 16:49:53 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Michael Davidson <md@...gle.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Shaohua Li <shli@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>, X86 ML <x86@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH 1/7] Makefile, LLVM: add -no-integrated-as to KBUILD_[AC]FLAGS

Hi Michael,


2017-03-17 9:15 GMT+09:00 Michael Davidson <md@...gle.com>:
> Add -no-integrated-as to KBUILD_AFLAGS and KBUILD_CFLAGS
> for clang.

>From the code-diff, it is apparent that
you added -no-integrated-as.

Rather, I'd like to see "why" in the git-log.

Obviously, clang needs this patch to build the kernel,
but can you describe the reason why the integrated assembler is bad?

With git-log reworded, I will pick up this shortly.

Thanks!



> Signed-off-by: Michael Davidson <md@...gle.com>
> ---
>  Makefile | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index b841fb36beb2..b21fd0ca2946 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -704,6 +704,8 @@ KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
>  # See modpost pattern 2
>  KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
>  KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
> +KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
> +KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
>  else
>
>  # These warnings generated too much noise in a regular build.







-- 
Best Regards
Masahiro Yamada