(...)
> Merci, sur le forum de Unixtech Yop � post� ce lien int�ressant:
> http://www.freehackers.org/gentoo/gccflags/
>
> - --
> # Fabian Vilers
> # [EMAIL PROTECTED]
> # http://fabianvilers.linux-fan.com
> #
> # Powered by Gentoo
> # GnuPG Key ID: 0x7F52B5F6
> # Available at http://pgp.ael.be - http://belgium.keyserver.net
>
> Didier> ok, mais un truc m'�tonne qd m�me !
>
> http://www.freehackers.org/gentoo/gccflags/flag_gcc3.html
>
> ------------------
> This page is for those who don't want to experiment, want a
> stable system,
> but still optimized for their processor. Be careful, by using
> those flags,
> binaries from your system might not work on another one. So if you
> compiled with those flags optimized for p4, you cant send a
> tbz2 or share
> a hard disk with a friend who only has a pentium MMX.
> ------------------
>
> �a me semble d�bile �a?
> Ce n'est pas parce que le kernel, les utilitaires, gzip, etc,
> seraient
> compil�s pour un Pentium MMX qu'un autre PC non mmx serait
> incapable de
> d�compresser le fichier bz2 par ex !???
>
> De plus, si de telles limitations et probl�mes de compatibilit�s
> existaient, �a se saurait je pense?
>
> --
> Didier
>
En fait, si tu optimises pour un athlon, gcc utilisera parfois des instructions propre � ce cpu afin d'acc�lerer le tout, donc ton binaire compil� pour athlon, ne fonctionnera (peut-etre) pas sur un p4. Je pense aussi (a verifier) que si tu utilises -mcpu=athlon ca fonctionnera partout mais optimis� pour athlon (binaire plus lourd), par contre -march=athlon donnera une optimisation uniquement pour ahtlon.
Fabian
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