From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.62) (envelope-from ) id 1HhfF2-0002Zl-Lb for garchives@archives.gentoo.org; Sat, 28 Apr 2007 05:13:05 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l3S5BnpX003813; Sat, 28 Apr 2007 05:11:49 GMT Received: from hades.rz.tu-clausthal.de (hades.rz.tu-clausthal.de [139.174.2.20]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l3S57kVB031572 for ; Sat, 28 Apr 2007 05:07:46 GMT Received: from hades.rz.tu-clausthal.de (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 05683207BAA for ; Sat, 28 Apr 2007 07:07:09 +0200 (CEST) Received: from tu-clausthal.de (poseidon [139.174.2.21]) by hades.rz.tu-clausthal.de (Postfix) with ESMTP id D40B4207BA9 for ; Sat, 28 Apr 2007 07:07:08 +0200 (CEST) Received: from energy.heim10.tu-clausthal.de (account wevah [139.174.241.94] verified) by tu-clausthal.de (CommuniGate Pro SMTP 5.1.8) with ESMTPSA id 22335449 for gentoo-user@lists.gentoo.org; Sat, 28 Apr 2007 07:07:08 +0200 From: "Hemmann, Volker Armin" To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Changing CFLAGS Date: Sat, 28 Apr 2007 07:07:04 +0200 User-Agent: KMail/1.9.6 References: <20070428014004.GA1617@zone.wonkology.org> In-Reply-To: <20070428014004.GA1617@zone.wonkology.org> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704280707.04269.volker.armin.hemmann@tu-clausthal.de> X-Virus-Scanned: by PureMessage V4.7 at tu-clausthal.de X-Archives-Salt: 5f52762e-43a7-4246-8677-69a11903f9e0 X-Archives-Hash: aaf50c752a65247218e4c68dcce719ac On Samstag, 28. April 2007, Alex Schuster wrote: > > What would be the best way to do this? complete reinstallation. > I thought about unpacking > a stage1 tarball, changing CFLAGS, calling bootstrap.sh and doing > an emerge -e world, but this would overwrite things in /etc and > clutter my file system with more things I do not really want, > like creating entries in /dev. I would rather like to keep the > current setup as it is. use knoppix. If you don't want to reinstall everything and the XP is just a temporary replacement, get a knoppix livecd. It lets you save things to a file, if you want to. > > I think that I saw a howto once about what to do in such a case, > but at that time I did not need it, and now I cannot find it. the howto is: remove the system and start from scratch. > > > BTW: What exactly are the benefits from using march instead of > mcpu? Is there a noticeable difference in speed anyway? With mcpu > I would not have the trouble I am having now... Your trouble started, when you switched to a completly different cpu... mcpu = only rearranging stuff so it might run better on the cpu specified. No instructions and features used, that are not available on all the other cpus from a family (in theory, a binary built with mcpu=athlon-xp should be able to run on a i486). march = optimizing for the specified cpu. Using all features and instructions available, building stuff not able to run on other cpus. (so a resulting binary of march=athlon-xp won't run on a i486) usually march is faster on the given cpu, mcpu is more compatible. -- gentoo-user@gentoo.org mailing list