Gdb from LispWorks

a few months ago, I interfaced Gecode (C++ constraint programming library) towards LispWorks, using the CFFI library, with the help of SWIG. And for now, I am trying to interface an extra module of Gecode, but I got unexpected troubles and memory problems (bus errors and segmentation faults). The code is too huge to be showed here. Does anybody know about that kind of problem ? Or even better, does anybody know how to use the C/C++ debugger gdb from LispWorks ?

Two precisions :

- The code works from C++ execution.

- I am working on MacOS X.

I would be very grateful to people who you'd accept to help me, since I need this to complete my master thesis and I am out of clue to fix this problem.

Sascha Van Cauwelaert.