From owner-freebsd-questions@FreeBSD.ORG  Tue Nov  4 00:20:21 2003
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id BEDE216A4D6
	for <freebsd-questions@freebsd.org>;
	Tue,  4 Nov 2003 00:20:21 -0800 (PST)
Received: from hotmail.com (law11-oe24.law11.hotmail.com [64.4.16.81])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 1E0E743F75
	for <freebsd-questions@freebsd.org>;
	Tue,  4 Nov 2003 00:20:21 -0800 (PST)
	(envelope-from weiwuzhang@hotmail.com)
Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
	 Tue, 4 Nov 2003 00:20:20 -0800
Received: from 218.193.5.120 by law11-oe24.law11.hotmail.com with DAV;
	Tue, 04 Nov 2003 08:20:20 +0000
X-Originating-IP: [218.193.5.120]
X-Originating-Email: [weiwuzhang@hotmail.com]
Message-ID: <3FA76159.6010807@hotmail.com>
Date: Tue, 04 Nov 2003 16:20:41 +0800
From: Zhang Weiwu <weiwuzhang@hotmail.com>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.4.1) Gecko/20031025
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: freebsd-questions@freebsd.org
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-OriginalArrivalTime: 04 Nov 2003 08:20:20.0994 (UTC)
	FILETIME=[7CE4A620:01C3A2AC]
Subject: optimize with -O2 or -O?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 04 Nov 2003 08:20:21 -0000
X-List-Received-Date: Tue, 04 Nov 2003 08:20:21 -0000
X-List-Received-Date: Tue, 04 Nov 2003 08:20:21 -0000

Hello. I'm running 5.1-RELEASE.

I read the gcc man page. It is not clear what -O implys. Is -O equal to 
-O1 or -O2? If I wish to optimize making does it make sense to add 
CFLAGS=-O2 in the make.conf(5)?