[PATCH] Add an operator<(Complex, Complex) to oct-sort.cc for non-g++ compilers.

[Jason Riedy]

And John W. Eaton writes:
> Does that help?  If not, precisely what is the error message
> you see from icc?

I'll get back to you as soon as I can.  Unfortunately, I didn't
save the error messages.  Compiling on IA64 is quite a lengthy
process.  Running a fresh configure takes over an hour, mostly in
dynamically linking bash for each subshell.  There's a reason why
so few people use IA64 even though it's really, really fast for
numerical work.  (Optimized sparse matrix-vector products can
reach 80% of peak...)

On IA32/amd64, icpc and recent libstdc++ disagree about what
atomic primitives are implemented.  Intel only implements
__sync_fetch_and_add on IA64...  So I'm not in a position to
check easily on a useful platform, and gcc's fine for non-IA64.

Jason