From owner-freebsd-amd64@FreeBSD.ORG  Sat Mar  5 06:51:04 2005
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Date: Sat, 5 Mar 2005 00:51:03 -0600
From: Astrodog <astrodog@gmail.com>
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Subject: Re: Is -O2 supported for world?
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On Fri, 4 Mar 2005 23:30:07 -0500, Damian Gerow <dgerow@afflictions.org> 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:
> 
>     /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.
> 
>   - Damian
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> 

As I understand it, AMD64 will not compile with -O2.