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

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Date:	Mon, 04 Oct 2010 18:20:50 +0200
From:	Avi Kivity <avi@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.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 05:43 PM, H. Peter Anvin wrote:
> 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...
> 	

Well, / and * do join.  % doesn't.  In a way, + does.

cpp is not a pure text processing language.  It's specifically geared to 
C, and is fairly creaky when applying it to something other than C (and 
is only somewhat creaky when applying it to C).

-- 
error compiling committee.c: too many arguments to function

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