Core 2 duo - architecture, CHOST and CFLAGS

qubaaa · Tux's lil' helper Joined: 23 Dec 2006 Posts: 148

I have intel Core 2 Duo. I want to install Gentoo and i don't know exactly which architecture (x86, i686 or amd64) should i choose? I read many topics about that, but I haven't found a good answer.

Then how should I configure my cflags? Gentoo-wiki says:

markkuk · Guru Joined: 29 Nov 2002 Posts: 446

If you want a 32-bit installation choose i686, for 64-bit choose amd64. The CFLAGS you quoted are right for 64-bit (amd64) installation.

qubaaa · Tux's lil' helper Joined: 23 Dec 2006 Posts: 148

What is better, 64 or 32?

Are any problems with 64bt?

sonicbhoc · Posted: Sat Dec 30, 2006 1:37 pm Post subject:

mostly all of the packages in portage work with 64-bit. Set multilib in your useflags, and you can have both 32 and 64 bit libraries. I haven't tried this myself yet, as I have no 64 bit processors lying around my house, but lots of other people do it so whatever.
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qubaaa · Tux's lil' helper Joined: 23 Dec 2006 Posts: 148

ok I take 64bit. Also amd64 and:

bubbl07 · Posted: Sat Dec 30, 2006 3:26 pm Post subject:

streamkid

Searched but didn't find anything equal..
I 'm getting a laptop with core2duo (7100) tomorrow and i 'm thinking of compiling a 64bit gentoo instead of 32bit...
Will be a big difference? Are there any compatibility issues?

Also, i found these flags, do you have any recommendations, etc.?
32bit:
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=pentium-m -msse3 -O2 -pipe -fomit-frame-pointer"
-or-
CFLAGS="-march=prescott -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"

64bit:
CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=nocona -O2 -pipe"
CXXFLAGS="${CFLAGS}"

Thanks in advance

mattsteven · Posted: Thu Jul 26, 2007 3:42 pm Post subject:

You'll usually do best stability-wise to use the CFLAGS that come with your stage tarball.

64 bit will give you anywhere from fractional performance gains to 60% faster operation depending on what you do. You will be able to run most 32 bit apps using the compat layer, but some things like binaries, browser plugins and some codecs for multimedia may be problematic.

Overall I am content with having switched to 64 bit.
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Clete2 · Posted: Thu Jul 26, 2007 4:03 pm Post subject:

I just switched over to 64-bit and I have yet to have any 64-bit specific problems. It's running smoothly and it's quite 'zippy.'

I am using CFLAGS="-march=nocona -Os -pipe -fomit-frame-pointer'

I will be changing to -march=core2 when GCC 4.3 is out. I don't know what the difference will be, though.
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nixnut · Posted: Thu Jul 26, 2007 4:04 pm Post subject:

merged above three posts here.
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streamkid · Posted: Thu Jul 26, 2007 4:55 pm Post subject:

I read something like flash isn't going to work, etc..
That doesn't happen, right?
It 's my first 64bit and i don't know what will happen..

I 'll give it a try since you say i 'll have such performance..

btw, i mainly use firefox, gaim, gvim and gimp, and... beryl. Should not have problem with these, right?

Thanks all of you for your answers!!

mattsteven · Posted: Thu Jul 26, 2007 5:55 pm Post subject:

streamkid · Posted: Thu Jul 26, 2007 6:06 pm Post subject:

Eek.. I want a 64bit firefox..
I think i can still live without flash..

Thanks for the help

dayul · Posted: Thu Jul 26, 2007 7:41 pm Post subject:

wyvern5 · Apprentice Joined: 11 Nov 2006 Posts: 161

I use nspluginwrapper with 64-bit firefox and real adobe flash and, with the latest flash version, it works great. (Previous flash versions had issues if you left a window with flash open and then switched desktops.)

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

nspluginwrapper is the way to go. You get 64-bit firefox and the real Flash player.

It is unbelievable that Adobe can't finish a 64-bit version in any decent time.
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cyrillic · Posted: Fri Jul 27, 2007 1:38 am Post subject:

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