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Date: Tue, 2 Mar 2010 23:57:20 -0500
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From: "illoai@gmail.com" <illoai@gmail.com>
To: Aaron Lewis <aaron.lewis1989@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Compiler Flags problem with core2 CPU
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On 28 February 2010 07:38, Aaron Lewis <aaron.lewis1989@gmail.com> wrote:
> Hi,
> =A0 I gonna recompile kernel for my core2 CPU , so i'd like to pass some =
flags
> to gcc.
> =A0 Kinds of "-march=3Dcore2" , i tried to modify /etc/make.conf
> =A0 =A0 e.g =A0 =A0CFLAGS +=3D -march=3Dcore2 -O20 -ffast-math -mfpmath=
=3Dsse
> =A0 But it fails .. bad arch switch , core2 cpu is not supported ?

Just so you know -O20 is the same as saying -O3.

I don't think everything in base is safe for -ffast-math,
but setting it in make.conf will surely test that.

-O2 is already turned on almost everywhere by default,
so also, I believe, with -fomit-frame-pointer.  The only
thing I've ever found to be remotely useful to change
was -Os on an old, space-restricted machine.  But
last time I tried -Os on amd64 it broke.  Badly.

--=20
--