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Nutterpc
Tux's lil' helper
Joined: 02 Feb 2004
Posts: 83
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 Posted: Thu Oct 01, 2009 6:28 am Post subject: Cflags question |
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Greetings again one and all
Been a while since i was here, and now I have a question
Being my cpu in my current desktop, am unsure as to what may be the best cflags to use for it
AMD Phenom II X4 955BE
I have a rough idea of what it is I want to use, but ideally thought would ask what other options i would have of what I can set it to
**EDIT**
http://en.gentoo-wiki.com/wiki/Safe_Cflags/AMD#Athlon_X2_7x50.2C_Phenom_X3.2FX4.2C_Phenom_II.2C_Athlon_II <----- This page mentions part of the cflags I can use, but in the sense of gentoo, and my own personal knowledge, I'm itchy to know what else I can add to it
Without having to run those benchmark utils which tell you the most optimal cflags for ur system, they take too long, lol
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If it isn't broke, you ain't tweaked it right
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xaviermiller
Bodhisattva
Joined: 23 Jul 2004
Posts: 8710
Location: ~Brussels - Belgique
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| Posted: Thu Oct 01, 2009 6:53 am Post subject: |
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Hello,
I always use that, whatever my config is:
| Code: | CFLAGS="-O2 -pipe -fomit-frame-pointer -march=native -mtune=native"
CXXFLAGS="${CFLAGS}" |
And GCC will take the best and safe for your CPU 
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Xavier Miller |
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d2_racing
Bodhisattva
Joined: 25 Apr 2005
Posts: 13047
Location: Ste-Foy,Canada
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| Posted: Thu Oct 01, 2009 10:57 am Post subject: |
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| in fact, -march=native is the best choice. |
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Mike Hunt
Watchman
Joined: 19 Jul 2009
Posts: 5287
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| Posted: Thu Oct 01, 2009 7:24 pm Post subject: |
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| d2_racing wrote: | | in fact, -march=native is the best choice. |
...if you have >=sys-devel/gcc-4.2.3
In fact, you can see what -march=native will set like this | Code: | | gcc -### -march=native -E /usr/include/stdlib.h 2>&1 | grep "/usr/libexec/gcc/.*cc1" |
So, as you can see, you don't even need -mtune=native  |
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Installing Gentoo
