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Re: macro expansion and operator &&

From: Alan Modra <amodra at gmail dot com>
To: Jan Beulich <JBeulich at novell dot com>
Cc: Alex Druinsky <alexdrui at post dot tau dot ac dot il>, binutils at sourceware dot org
Date: Tue, 17 Aug 2010 20:41:45 +0930
Subject: Re: macro expansion and operator &&
References: <20100814142435.78063bg9mxtbll2r@webmail.tau.ac.il> <20100816050120.GK31102@bubble.grove.modra.org> <4C691538020000780000FFC0@vpn.id2.novell.com> <20100817052934.GP31102@bubble.grove.modra.org> <4C6A4F0E0200007800010492@vpn.id2.novell.com>

On Tue, Aug 17, 2010 at 07:57:50AM +0100, Jan Beulich wrote:
> Are you sure it's x&yz?

No, silly me.  I didn't check.  x&yz is what you get without
--alternate.

> > That was the first thing I tried when looking into this problem.
> > gas/all/altmacro fails.
> 
> Wasn't that just because the .noaltmacro portion of the test
> incorrectly expects the & in the macro definition to be stripped?
> That may need to be changed if the sources get fixed.

It's not that '&' is a separator that should be stripped.  '&' starts
a macro parameter substitution, just as '\\' does.  So perhaps the
FIXME should say "document this feature".  :-)

-- 
Alan Modra
Australia Development Lab, IBM

References:
- macro expansion and operator &&
  - From: Alex Druinsky
- Re: macro expansion and operator &&
  - From: Alan Modra
- Re: macro expansion and operator &&
  - From: Jan Beulich
- Re: macro expansion and operator &&
  - From: Alan Modra
- Re: macro expansion and operator &&
  - From: Jan Beulich

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