Message-ID: <41AB7790.5050404@zytor.com>
Date: Mon, 29 Nov 2004 11:25:04 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Tom Rini <trini@kernel.crashing.org>
CC: Linus Torvalds <torvalds@Osdl.ORG>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Allow compiling i386 with an x86-64 compiler
References: <41A4B52D.2030402@zytor.com> <20041129185004.GF22325@smtp.west.cox.net>
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Tom Rini wrote:
> On Wed, Nov 24, 2004 at 08:22:05AM -0800, H. Peter Anvin wrote:
> 
> 
>>This patch adds -m32 if gcc supports it, thus making it easier to 
>>compile the i386 architecture with an x86-64 compiler.
>>
>>Note that it adds the option to CC, since it also affects assembly code 
>>and linking.  The extra level of indirection is because $(call 
>>cc-option) itself uses $(CC), so just doing CC += ... would cause $(CC) 
>>to be recursively defined.
> 
> 
> Just so 'bi-arch' arches look the same, I'd like to suggest (and stolen
> from ppc32) something like:
> HAS_BIARCH      := $(call cc-option-yn, -m32)
> ifeq ($(HAS_BIARCH),y)
> CC := $(CC) -m32
> endif
> 
> Up near the top...
> 

I'm not really happy with it, because it's misleading; it implies it 
tests for a working x86-64 devel environment, which it doesn't.  It's 
not a strong opinion, though.

	-hpa

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