core2duo make.conf

Crooksey · Posted: Fri Oct 24, 2008 10:11 pm Post subject: core2duo make.conf

As gentoo wiki is down my refrence for re-installs has gone, could anyone share their make.conf for their core2duo system, mainly just the CFLAGS, thanks.

zyko · Posted: Fri Oct 24, 2008 11:29 pm Post subject:

This is mine, for gcc-4.3.1. It's the same for x86 and amd64:

d2_racing · Posted: Fri Oct 24, 2008 11:58 pm Post subject:

Hi, i use this with my Quad Core :

desultory · Bodhisattva Joined: 04 Nov 2005 Posts: 9410

You could use the snapshot cached by Google.

Crooksey · Posted: Sun Oct 26, 2008 11:19 am Post subject:

Thanks, much appreciated.

Paapaa · l33t Joined: 14 Aug 2005 Posts: 955 Location: Finland

d2_racing · Posted: Thu Oct 30, 2008 11:52 am Post subject:

Also, there a lot of thing that are include inside -O2 :

http://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Optimize-Options.html
http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/i386-and-x86_002d64-Options.html

pilla · Posted: Thu Oct 30, 2008 12:17 pm Post subject:

There's a new option, -march=core2, that I wasn't aware.
_________________
"I'm just very selective about the reality I choose to accept." -- Calvin

d2_racing · Posted: Thu Oct 30, 2008 2:20 pm Post subject:

In fact, -march=core2 is the best option, because if you use native, the Gcc has to compare his database to see what Gcc option that he will use.

Specifying the right arch, this will safe a split second on every package.

The puriste use the right arch and they not let Gcc figure this out my himself.

Schwinni · Posted: Fri Oct 31, 2008 1:55 pm Post subject:

Basically you are right, but there are some packages which don't compile with gcc 4.3.x, e.g. pdftk.
For that you need gcc 4.2.x, which doesn't understand -march=core2.
But gcc 4.2 supports march=native.

This way you don't have to change your make.conf every time you switch your gcc for a certain package.
The optimization result should be the same anyway...