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Subject: Re: Avoiding "unused variable" warnings
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Andrey Borzenkov <arvidjaar@mail.ru>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 13 Jul 2003 17:22:22 +0100
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On Sul, 2003-07-13 at 16:46, Jeff Garzik wrote:
> No need for a macro, just do
> 
> 	(void) var_name;
> 
> It doesn't generate any code, and it shuts up the compiler.

It may do. The proper gcc thing is attribute unused. Both are dangerous
as they hide when the variable becomes really unused