From owner-freebsd-hackers@FreeBSD.ORG  Fri Feb 13 19:09:42 2004
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id C885C16A4CE; Fri, 13 Feb 2004 19:09:42 -0800 (PST)
Received: from saturn.criticalmagic.com (saturn.criticalmagic.com
	[68.213.16.21])	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 985D743D1F; Fri, 13 Feb 2004 19:09:42 -0800 (PST)
	(envelope-from richardcoleman@mindspring.com)
Received: from mindspring.com (titan.criticalmagic.com [68.213.16.23])
	by saturn.criticalmagic.com (Postfix) with ESMTP
	id E0C9F3BD2A; Fri, 13 Feb 2004 22:09:41 -0500 (EST)
Message-ID: <402D917D.30009@mindspring.com>
Date: Fri, 13 Feb 2004 22:09:49 -0500
From: Richard Coleman <richardcoleman@mindspring.com>
Organization: Critical Magic, Inc.
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
	rv:1.6) Gecko/20040113
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Paul Seniura <pdseniura@techie.com>
References:
	<20040213001703.616C75C3B@techpc04.okladot.state.ok.us><20040213011324.GA55948@xor.obsecurity.org><20040213035608.3AA11A38EA@scifi.homeip.net><20040213040929.GA58196@xor.obsecurity.org>
	<20040213170347.DC19E5C3B@techpc04.okladot.state.ok.us>
In-Reply-To: <20040213170347.DC19E5C3B@techpc04.okladot.state.ok.us>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: freebsd-hackers@freebsd.org
cc: freebsd-questions@freebsd.org
cc: Kris Kennaway <kris@obsecurity.org>
Subject: Re: need help on CFLAGS in /etc/make.conf please
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: richardcoleman@mindspring.com
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 14 Feb 2004 03:09:42 -0000

Paul Seniura wrote:
> Chapter 2 of "FreeBSD Developers' Handbook":
> 
> | 2.4 Compiling with cc
> |
> | -O
> |    Create an optimized version of the executable.  The compiler
> |    performs various clever tricks to try and produce an executable 
> |    that runs faster than normal.  You can add a number after the -O
> |    to specify a higher level of optimization, but this often exposes
> |    bugs in the compiler's optimizer.  For instance, the version of cc
> |    that comes with the 2.1.0 release of FreeBSD is known to produce
> |    bad code with the -O2 option in some circumstances.
> |
> |    Optimization is usually only turned on when compiling a release
> |    version.
> |[...]
> 
> HUH?!?  "the version of cc that comes with 2.1.0" has those -O bugs????
> Good grief, we're running 5.x (-Current, actually)!
> I can't find any mention of any such bugs with GCC 3.x on i386.

Unless there is evidence of more recent gcc bugs, that part of the 
handbook should really be removed.

I can easily imagine the reaction on this list if the reverse were true, 
and the gcc handbook was knocking FreeBSD for a bug in release 3.0 (or 
whatever).

Richard Coleman
richardcoleman@mindspring.com