linux-kernel - Re: [PATCH] x86: LLVMLinux: Wrap -mno-80387 with cc-option

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Message-ID: <20140422060544.GA9133@gmail.com>
Date:	Tue, 22 Apr 2014 08:05:44 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	behanw@...verseincode.com
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, dwmw2@...radead.org,
	pageexec@...email.hu
Subject: Re: [PATCH] x86: LLVMLinux: Wrap -mno-80387 with cc-option


* behanw@...verseincode.com <behanw@...verseincode.com> wrote:

> From: Behan Webster <behanw@...verseincode.com>
> 
> Wrap -mno-80387 gcc options with cc-option so they don't break clang.
> 
> Signed-off-by: Behan Webster <behanw@...verseincode.com>
> ---
>  arch/x86/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/Makefile b/arch/x86/Makefile
> index d1b7c37..ce6ad7e 100644
> --- a/arch/x86/Makefile
> +++ b/arch/x86/Makefile
> @@ -83,7 +83,9 @@ else
>          KBUILD_CFLAGS += -m64
>  
>          # Don't autogenerate traditional x87, MMX or SSE instructions
> -        KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-80387 -mno-fp-ret-in-387
> +        KBUILD_CFLAGS += -mno-mmx -mno-sse
> +        KBUILD_CFLAGS += $(call cc-option,-mno-80387)
> +        KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)

Is there a clang equivalent option that inhibits all things FPU opcode 
generation by the compiler?

That's the general purpose of -no-80387.

Thanks,

	Ingo
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