From owner-freebsd-current@FreeBSD.ORG  Fri Jul 27 11:28:20 2012
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 93968106566C
	for <current@freebsd.org>; Fri, 27 Jul 2012 11:28:20 +0000 (UTC)
	(envelope-from phk@phk.freebsd.dk)
Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222])
	by mx1.freebsd.org (Postfix) with ESMTP id 130428FC14
	for <current@freebsd.org>; Fri, 27 Jul 2012 11:28:20 +0000 (UTC)
Received: from critter.freebsd.dk (unknown [192.168.48.2])
	by phk.freebsd.dk (Postfix) with ESMTP id AB8833B6B9;
	Fri, 27 Jul 2012 11:20:49 +0000 (UTC)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.14.5/8.14.5) with ESMTP id q6RBKmW1009655;
	Fri, 27 Jul 2012 11:20:49 GMT (envelope-from phk@phk.freebsd.dk)
To: Luigi Rizzo <rizzo@iet.unipi.it>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Fri, 27 Jul 2012 11:38:24 +0200."
	<20120727093824.GB56662@onelab2.iet.unipi.it>
Content-Type: text/plain; charset=ISO-8859-1
Date: Fri, 27 Jul 2012 11:20:48 +0000
Message-ID: <9654.1343388048@critter.freebsd.dk>
Cc: current@freebsd.org
Subject: Re: (void)foo or __unused foo ?
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 27 Jul 2012 11:28:20 -0000

In message <20120727093824.GB56662@onelab2.iet.unipi.it>, Luigi Rizzo writes:

>The alternative way to avoid an 'unused' warning from the compiler
>is an empty statement
>
>	(void)foo;

The thing I don't like about this form, is that it doesn't communicate
your intention, only your action.

Somewhere down my TODO list I have an item to propose instead:

	typedef void unused_t;

	int main(int argc, char **argv)
	{

		(unused_t)argc;
		(unused_t)argv;
		return (0);
	}

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.