Is -O2 supported for world?
Astrodog
astrodog at gmail.com
Sat Mar 5 06:51:04 GMT 2005
On Fri, 4 Mar 2005 23:30:07 -0500, Damian Gerow <dgerow at 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.
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