From: Johnny Hughes <mailing-lists@xxxxxxxxxxxx>
> All of that is probably true ... but the optimizations are already set
> by default by the config.guess and autoconf and automake for almost all
> RedHat SRPMS ... and CentOS doesn't change those, unless absolutely
> necessary.
Which is what I agree is most preferrable.
> Therefore, for almost all packages on CentOS-3 they are --march=i386
> --mtune=i686 ...
Maybe I need to look a bit deeper then. I could have swore I've seen
many packages with Makefiles (after any autoconf) that clearly send to
stdout a "gcc ... --march=i486". Maybe I'm thinking too much of just
the kernel itself.
> and for most CentOS-4 packages they are --march=i386 --
> mtune=pentium4 ... being that the default target is i386.
Yep, I guess the --mtune=pentium4 was introduced with FC2+.
I would recommend Intel backtrack though, because it's not the
most ideal for other i686 architectures (only true P4 or Athlon).
Although the performance hit is not that much.
--
Bryan J. Smith mailto:b.j.smith@xxxxxxxx
