Bug with redefinition of register on ia64 architecture

[Stephen J. Turnbull]

Hans de Graaff writes:

 > I had a quick look in src/lisp.h myself, and I found it interesting to see
 > that the code that is currently enabled is the DEBUG_XEMACS code.

I can't speak to the register problem at the moment.

Since --debug adds a small amount of code at very little cost in speed
but a huge improvement in debuggability, it's enabled by default.  If
you turn it off, in a significant minority of bugs in the C code you'll
be told to turn it on, rebuild, and reproduce, or we can't help you.