linux-kernel - Re: [PATCH] x86: minor Makefile simplification through use of cc-ifversion

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Date:	Fri, 24 Jul 2009 17:26:44 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Frans Pop <elendil@...net.nl>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, x86@...nel.org
Subject: Re: [PATCH] x86: minor Makefile simplification through use of
	cc-ifversion

On Thu, Jul 23, 2009 at 08:56:27PM +0200, Frans Pop wrote:
>Signed-off-by: Frans Pop <elendil@...net.nl>
>---
>
>Change was suggested by Sam Ravnborg; see http://lkml.org/lkml/2009/7/18/15.
>Tested to work correctly.


Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>


>
>diff --git a/arch/x86/Makefile b/arch/x86/Makefile
>index 1b68659..1f3851a 100644
>--- a/arch/x86/Makefile
>+++ b/arch/x86/Makefile
>@@ -32,8 +32,8 @@ ifeq ($(CONFIG_X86_32),y)
> 
>         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
>         # a lot more stack due to the lack of sharing of stacklots:
>-        KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
>-                echo $(call cc-option,-fno-unit-at-a-time); fi ;)
>+        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
>+				$(call cc-option,-fno-unit-at-a-time))
> 
>         # CPU-specific tuning. Anything which can be shared with UML should go here.
>         include $(srctree)/arch/x86/Makefile_32.cpu
>--
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