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Location: Somewhere, over the rainbow, way up high
mcpu vs march
im installing gentoo and am to the point where i edit /etc/make.conf
i want to change the flags (-mcpu and -march) of my processor to make it run more efficiently, but i dont know if i can use both ot them at the same time, because of how they deal differently with compatability with other processors
my question is this:
can i use both flags at the same time?
and if not: then which should i use?
looking around, some people use both, some only use march, and i have no idea
I think -mcpu and -march are exclusive because -mcpu limits optimization to the point of retaining compatibility with others while -march breaks it. So -march would max it out. Or -march would override -mcpu, anyway.
Could be totally wrong, of course, but I think that's the deal. *g*
If you want maximum optimization, I believe so, yes. -march=athlon-xp should be sufficient. But be sure that you know your processor type. And, while I hate to say it, you might do better to post at (or search) the Gentoo forums for this particular issue to be absolutely certain. This is just my understanding.