Xcode debugger issue

I have a c++ I program that I ported over to Xcode. I am compiling it with a makefile that I imported into the project as an external target. The makefile uses g++ with the -g (debug info) flag included. According to the g++ man page the -g flag makes the program debuggable with GDB. GDB works perfectly as I can set breakpoints and watchpoints without any problems. I assume it should also make the program debuggable by the xcode debugger since it is a graphical front-end for GDB. Unfortunately when I try and run the xcode debugger it does not honor any of my breakpoints.

Thanks in advance for your help.