linux-kernel - Re: gas 2.16 and assembly macros -- entry

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Message-ID: <4CA9F625.7090709@zytor.com>
Date:	Mon, 04 Oct 2010 08:43:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	heukelum@...tmail.fm, tglx@...utronix.de,
	akpm@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: gas 2.16 and assembly macros -- entry_64.S build failure

On 10/04/2010 03:04 AM, Avi Kivity wrote:
>  On 10/01/2010 02:26 AM, H. Peter Anvin wrote:
>> ... but that doesn't work with the macros like movq_cfi.  On those, we
>> could argue that at least people won't put $ on them, but cpp will still
>> split them apart with spaces; this apparently causes problems at least
>> as soon as there is an expression more complicated than addition
>> involved (apparently plus signs are okay, but minus signs aren't!)
> 
> Likely due to the fact that a minus sign can later join with a number
> and become a new token, but a plug sign cannot.
> 

... except the same thing applies to other operators, other than the
plus sign.  This kind of characterization is insanely frustrating, and
really doesn't seem to follow logical rules ... we had a previous one
where changing a macro name from upper case to lower case made gas 2.16
work...
	
	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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