From owner-freebsd-questions@FreeBSD.ORG  Mon Jul 14 14:37:54 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 2C3E137B401
	for <freebsd-questions@FreeBSD.ORG>;
	Mon, 14 Jul 2003 14:37:54 -0700 (PDT)
Received: from pop015.verizon.net (pop015pub.verizon.net [206.46.170.172])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 54DD643F3F
	for <freebsd-questions@FreeBSD.ORG>;
	Mon, 14 Jul 2003 14:37:53 -0700 (PDT)	(envelope-from cswiger@mac.com)
Received: from mac.com ([141.149.47.46]) by pop015.verizon.net
          (InterMail vM.5.01.05.33 201-253-122-126-133-20030313) with ESMTP
          id <20030714213752.BJGP20810.pop015.verizon.net@mac.com>
          for <freebsd-questions@FreeBSD.ORG>;
          Mon, 14 Jul 2003 16:37:52 -0500
Message-ID: <3F1322A9.8080805@mac.com>
Date: Mon, 14 Jul 2003 17:37:45 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
	rv:1.4) Gecko/20030624
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: freebsd Questions <freebsd-questions@FreeBSD.ORG>
X-Enigmail-Version: 0.76.1.0
X-Enigmail-Supports: pgp-inline, pgp-mime
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Authentication-Info: Submitted using SMTP AUTH at pop015.verizon.net from
	[141.149.47.46] at Mon, 14 Jul 2003 16:37:52 -0500
Subject: buggy optimization levels...
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: Mon, 14 Jul 2003 21:37:54 -0000

Hi, all--

The "known bugs" section of the GCC info documentation lists 5 issues; "man gcc" 
lists none.  Can someone provide a test case for a bug involving "cc -O" versus 
"cc -O3" under FreeBSD 4-STABLE for the x86 architecture?

What is the preferred solution?  The Dragon book and other compiler references 
have a definition of safe versus unsafe "optimizations"; is the problem that -O3 
enables something unsafe?  Who is responsible (FreeBSD, GNU compiler team, 
others?) for changing the compiler defaults so that -Ox will not produce 
known-invalid results, for any x?

-- 
-Chuck