Re: Compiler opt

[Brett Viren <bv@bnl.gov>]

Karl Hegbloom <hegbloom@pdx.edu> writes:
> Here's the bug.  It does not tell me, explicitly enough, whether or not
> -m64 implies -march=k8 or not.  It seems to, but I'm not sure, since
> perhaps -march=k8 could be incompatible with the em64t.  I think that
> the documentation should be a little more clear here.

They are orthogonal flags.  On Debian-amd64 -m64 is on by default.
Using -march=k8 will turn on use of x86-64 instruction set.  
Don't know if em64t support all of x86-64.

-Brett.