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Date:      Thu, 23 Mar 2000 13:57:06 +0100
From:      Brad Knowles <blk@skynet.be>
To:        Ed Hall <edhall@screech.weirdnoise.com>, Andrew Gallatin <gallatin@cs.duke.edu>
Cc:        obrien@FreeBSD.ORG, Howard Leadmon <howardl@account.abs.net>, freebsd-alpha@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG, edhall@screech.weirdnoise.com
Subject:   Re: Compiler problems with -O2 (was Re: CVS Trouble, even under   4.0-RELEASE (alpha) HELP!)
Message-ID:  <v04220800b4ffc416c92d@[195.238.1.121]>
In-Reply-To: <200003230820.AAA12969@screech.weirdnoise.com>
References:  <200003230820.AAA12969@screech.weirdnoise.com>

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At 12:20 AM -0800 2000/3/23, Ed Hall wrote:

>  I'm frankly astonished that it has been suggested that higher optimizations
>  be disabled.  Blindly compiling the world at -O2 may be folly, but using
>  optimization can be quite useful for selected applications.

	In all seriousness, I'd be just as happy to have extremely strong 
warnings against using anything but -O by default (i.e., setting it 
in /etc/make.conf or setting "makeoptions" in your kernel 
configuration), with the caveat that the potential consequences can 
be exceptionally dire (such as having your entire machine toasted, 
etc...) if you decide that you want to take the risk and build your 
kernel with "-O2 -march=pentium" or whatever.

	People should be able to use whatever optimization they want on 
userland programs, and if they're stupid enough to aim thermonuclear 
weapons at their feet when doing the same with the kernel, well then 
maybe the Darwin effect will help the rest of us get a little more 
sleep.  ;-)

--
   These are my opinions -- not to be taken as official Skynet policy
======================================================================
Brad Knowles, <blk@skynet.be>                || Belgacom Skynet SA/NV
Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124
Phone/Fax: +32-2-706.13.11/12.49             || B-1140 Brussels
http://www.skynet.be                         || Belgium


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