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Gentoo-AMD64 on Intel EM64T?
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RobDaemon
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PostPosted: Mon Sep 20, 2004 5:17 pm    Post subject: Gentoo-AMD64 on Intel EM64T? Reply with quote

Has anyone set up an EM64T box running Gentoo yet (in 64bit mode)?

I've set my CFLAGS to: "-O2 -march=athlon64 -mno-3dnow -mfpmath=sse -m64" and I have multilib in my USE flags.

Now starting the bootstrap, wish me luck! :)
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codergeek42
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PostPosted: Mon Sep 20, 2004 5:31 pm    Post subject: Reply with quote

I was under the impression that -m64 was not needed and may break things...
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RobDaemon
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PostPosted: Mon Sep 20, 2004 5:48 pm    Post subject: Reply with quote

codergeek42 wrote:
I was under the impression that -m64 was not needed and may break things...


I hadn't seen that. Thanks for the tip, I removed it and restarted my bootstrap (luckily i hadn't started compiling anything yet, I was only on the fetch portion)
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RobDaemon
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PostPosted: Tue Sep 21, 2004 2:55 pm    Post subject: Reply with quote

System is up and running fine, and quite fast, I might add! I used the following CFLAGS, and made sure USE="multilib"

CFLAGS="-O2 -march=athlon64 -fomit-frame-pointer -pipe -funroll-loops -mno-3dnow -mfpmath=sse"

Things of note when using Intel hardware:

* The Blackdown JDK does not work on Intel hardware - it's using the 3DNow! prefetch instructions, which are not present on EM64T. The same goes for Sun's JDK 1.5.0-rc.

Not specific to x86_64:

* Don't put perl in your USE flags during bootstrap. You end up with a cyclic dependency and perl doesn't get compiled (I believe it was db-4.1.x that caused it)
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Lv
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PostPosted: Thu Sep 23, 2004 1:38 am    Post subject: Reply with quote

erm... -march=nocona should be what you really want. hop on irc.freenode.net and join #gentoo-amd64. talk to unsolo if he's around... he's the only other person i know who has an em64t.
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Dais
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PostPosted: Fri May 13, 2005 3:35 pm    Post subject: pentium 4 64, what cflags ? Reply with quote

Hi,

does someone know what cflags to use for a P4 64bits in order to install gentoo in 64bits ? (march, etc)

Merged with older topic. --Maedhros
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crazycat
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PostPosted: Fri May 13, 2005 4:47 pm    Post subject: Reply with quote

"-march=nocona -O2 -pipe"
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RazielFMX
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PostPosted: Sat May 13, 2006 7:31 pm    Post subject: Reply with quote

I like: "march=nocona -02 -pipe -fomit_frame_pointers"

Pretty safe.
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