I was able to piece together the beggings of a driver today that uses an
existing c++ wrapper around the GDS api. It was not too hard becuase
someone did a nice job of designing the C++ api to look like JDBC. So far,
I can connect, disconnect, execute statements, execute queries and execute
prepared statements. The driver is close enough to where I need it to
replace interclient for my own programming tasks, but needs lots of work to
get to the point where it is usable by programmers (and even more work
before it can be plugged into applications that speak JDBC!).

If the author of the c++ api gives permission, I can zip everything up and
put it somewhere.