Date: Mon, 7 Mar 2005 22:09:10 -0800 From: "David O'Brien" <obrien@freebsd.org> To: freebsd-amd64@freebsd.org Subject: Re: Is -O2 supported for world? Message-ID: <20050308060910.GA32871@dragon.nuxi.com> In-Reply-To: <20050305043006.GN83265@afflictions.org> References: <20050305043006.GN83265@afflictions.org>
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On Fri, Mar 04, 2005 at 11:30:07PM -0500, Damian Gerow wrote: > I'm a little fuzzy on whether -O2 is supported for world or not: I seem to > remember on x86 it is, but the only references I've seen to amd64 were > speaking about ports. > > Is -O2 optimization supported in amd64? It most definitely doesn't work: It is suppored w/in /usr/src. > /usr/src/lib/libc/i386/sys/_amd64_get_fsbase.c: In function `_amd64_get_fsbase': > /usr/src/lib/libc/i386/sys/_amd64_get_fsbase.c:40: warning: dereferencing type-punned pointer will break strict-aliasing rules > > without -fno-strict-aliasing. Not that I have any serious desire to run > with -O2, just curious. -O2 isn't supported in /usr/ports without -fno-strict-aliasing also. There are a few ports that aren't happy being compiled with any form of -O2 (such as the old perl). -- -- David (obrien@FreeBSD.org)
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