linux-kernel - Re: [patch] x86: add -freg-struct-return to CFLAGS

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Message-ID: <45DE19AD.1010404@zytor.com>
Date:	Thu, 22 Feb 2007 14:31:09 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Adrian Bunk <bunk@...sta.de>
CC:	Ingo Molnar <mingo@...e.hu>, Jeremy Fitzhardinge <jeremy@...p.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Andi Kleen <ak@....de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] x86: add -freg-struct-return to CFLAGS

Adrian Bunk wrote:
> On Thu, Feb 22, 2007 at 09:38:22AM +0100, Ingo Molnar wrote:
>> ...
>> --- linux.orig/arch/i386/Makefile
>> +++ linux/arch/i386/Makefile
>> @@ -31,7 +31,7 @@ LDFLAGS_vmlinux := --emit-relocs
>>  endif
>>  CHECKFLAGS	+= -D__i386__
>>  
>> -CFLAGS += -pipe -msoft-float -mregparm=3
>> +CFLAGS += -pipe -msoft-float -mregparm=3 -freg-struct-return
>>  
>>  # prevent gcc from keeping the stack 16 byte aligned
>>  CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
> 
> Why is this i386 specific?
> 

Because virtually all other architectures have it as their ABI default, 
anyway, and ABI selection should be per architecture.

	-hpa
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