What is the better Safe Cflage for Intel i5?

KingYes

Hey all,
What is the better Safe Cflage for my CPU Intel i5?

In Safe Cflags i see its need to be '-march=native', But in Safe_Cflags/Intel i see its need to be '-march=core2'.

And about 'MAKEOPTS'? i see '-j5', so its ok for my CPU?

So what i need to do?

Thanks a lots for your support.
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Yakir.

Etal · Veteran Joined: 15 Jul 2005 Posts: 1931

"-march=navtive" means that gcc will automatically pick the right flags based on what your CPU supports, so it's a superset of "-march=core2" (If you run
"gcc -Q --help=target -march=native" - from the wiki - you'll see that -march=core2 is one of the selected flags.)

MAKEOPTS just affect how many jobs it uses to build the package. On my dual core/multithreaded i7, -j5 builds faster than with -j4.
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“And even in authoritarian countries, information networks are helping people discover new facts and making governments more accountable.”– Hillary Clinton, Jan. 21, 2010

KingYes · Posted: Sat May 14, 2011 10:45 pm Post subject:

OK, Thanks you.
Now i have gentoo installed.. so how i can setup this option for all my packages?
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Yakir.

Etal · Veteran Joined: 15 Jul 2005 Posts: 1931

You can change it in make.conf, and all new packages will be built with that flag.

If you really want to, you can rebuild all currently-installed packages with "emerge -ae world", but it's not really worth it.
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“And even in authoritarian countries, information networks are helping people discover new facts and making governments more accountable.”– Hillary Clinton, Jan. 21, 2010

KingYes · Posted: Sat May 14, 2011 10:53 pm Post subject:

Thanks you !

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Yakir.