Gentoo Archives: gentoo-dev

From: Blue Lizard <webmaster@×××××××××.com>
To: gentoo-dev@××××××××××.org
Subject: Re: [gentoo-dev] -O2 <=> -O3 ?
Date: Sun, 23 Sep 2001 21:28:37
Message-Id: 3BAEA827.5000300@dofty.zzn.com
In Reply to: RE: [gentoo-dev] -O2 <=> -O3 ? by Erik Van Reeth
1 Erik Van Reeth wrote:
2 > Hi
3 >
4 >
5 >>I'm on a K6 III 400, if i change the -O3 to -O2 in my
6 >>/etc/make.conf , will
7 >>my system go faster? I noticed that KDE runs a little slower than on my
8 >>Redhat 7.1.... Please give me your thoughts?
9 >>
10 >
11 > I think this is due because the 'objprelink' USE flag is not active by
12 > default
13 > (commented out in /etc/make.conf). This setting gives faster code.
14 >
15 >
16 > Erik
17 >
18 >
19 > _______________________________________________
20 > gentoo-dev mailing list
21 > gentoo-dev@××××××××××.org
22 > http://cvs.gentoo.org/mailman/listinfo/gentoo-dev
23 >
24 >
25
26 to bart: i believe they refer to -O2 being faster COMPILE, as -O3 is
27 higher optimization for speed and larger code size and longer compile
28 time etc. There are some fine tunings you can do to make the most out
29 of your time and space in all areas. check out the gcc documentation on
30 options that control optimization. For instance, specifying what kinds
31 of functions to inline.
32
33 to erik: i thought 7.1 does not use objprelink? it wasnt exactly stable...