Optimize for my CPU

[Eric Lilja]

Hello,

when configuring Emacs ($ ./configure), what parameter should you pass to 
optimize it for a certain type of CPU?
I have a Pentium IV in my system, but Help->About Emacs lists i386 so I was 
thinking that the build I'm
running is optimized for an i386 when I want i686 optimizations.
I tried passing --cflags -march=i686 to the configure-script but it doesn't 
seem to recognise -march=i686
because the script halts.

Any ideas?

/ Eric