Thunderbird to XP

DaleNixon · Tux's lil' helper Joined: 13 Jul 2002 Posts: 91

My system's cpu is currently a 1.3GHz Athlon Thunderbird. I use the following CFLAGS:

CFLAGS="-march=athlon-tbird -O3 -pipe"

A friend is about to sell me his old Athlon XP 1900. Will my packages compiled with the above CFLAGS run on this new processor? From what I've read, the -march flag breaks compatibility with /older/ cpu's, not newer ones.

The reason I'm asking is because I have about a week before I get the new processor, and I'm debating doing an emerge -e world with my CFLAGS set to "-mcpu=athlon-xp -03 -pipe". Anyone have any insight into this matter?
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$umount /mnt/brain
umount: /mnt/brain is not mounted (according to mtab)

spirinaites · Posted: Sat Jun 07, 2003 3:54 pm Post subject:

I had a 1GHz Athlon Thunderbird compiled with CFLAGS="-march=athlon-tbird -O3 -pipe -fomit-frame-pointer", just moved my hard drive to a Athlon XP 1900+, no changes made and everything is working.

DaleNixon · Tux's lil' helper Joined: 13 Jul 2002 Posts: 91

Excellent! Thanks!
_________________
$umount /mnt/brain
umount: /mnt/brain is not mounted (according to mtab)

gearheadsmp · Posted: Sat Jun 07, 2003 10:37 pm Post subject: possibly

Using -03 breaks compatibility with other CPU's (ie trying to copy binaries from a P3 to a AthlonMP). The switch from a Tbird to a 1900+, with the 1900+ being a Palamino (or at least that's the kind of 1900+ NewEgg has in stock) won't affect you, because you (theoretically) won't be removing any of the flags the Tbird optimizations had. In hindsight, the XP/MP line support SSE, so you'll prolly want to remerge glibc and some of your math-oriented apps for that. As to what CFLAGS to use, I use the following which I copied off the great CFFlags Central thread: