[ODE] stack requirements

[Russ Smith]

> ode/src/stack.cpp/h seems to be a *unused* replacement for alloca.  is
> this something that never got finished or didn't work out?  Here's the
> interface...

this was used at one point for the joint groups. the implementation uses
mmap() (or the windows equivalent) to allocate non-physical memory
space, then allocates memory in as needed. this is conceptually nice but
not totally portable to all *nixes (at least not without a pile of
work), which is why it was abandoned.

russ.

-- 
Russell Smith
http://www.q12.org