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Newsgroups: comp.os.386bsd.misc Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!xlink.net!subnet.sub.net!flatlin!bad From: bad@flatlin.ka.sub.org (Christoph Badura) Subject: Re: Why uses /usr/src -O instead of -O2? Date: Mon, 21 Feb 1994 13:14:57 GMT Message-ID: <CLKssx.DLq@flatlin.ka.sub.org> References: <1994Feb16.103448.6398@paramount.nikhefk.nikhef.nl> Organization: Guru Systems/Funware Department Lines: 16 In <1994Feb16.103448.6398@paramount.nikhefk.nikhef.nl> eloy@paramount.nikhefk.nikhef.nl (Eloy Domingos) writes: >When rebuilding the 'world' I noticed that the makefiles use -O instead >of the better optimizing -O2. Is there a reason not to use the better >optimization? I think in gcc 2.4.5 the -O2 optimizer is reliable. I'm not sure of that. I've built a couple of NetBSD 0.9 kernels with -O2 that worked fine on the machine in question except that after a week the -O2 kernels refused to boot. Compiling with -O produced a kernel that works reliably ever since. However, that might easily be a hardware problem but somehow I couldn't be bothered to investigate further once the system was back up and running. -- Christoph Badura bad@flatlin.ka.sub.org +49 721 606137 Es genuegt nicht, keine Gedanken zu haben; man muss auch unfaehig sein, sie auszudruecken. - Karl Kraus