The QNX paths in solib-search-path are missing the architecture directory. The variable contains "/opt/qnx660/target/qnx6//lib:/opt/qnx660/target/qnx6//usr/lib" instead of "/opt/qnx660/target/qnx6/armle-v7/lib:/opt/qnx660/target/qnx6/armle-v7/usr/lib" or "opt/qnx660/target/qnx6/x86/lib:/opt/qnx660/target/qnx6/x86/usr/lib". The incorrect path prevents the debugger from locating QNX libraries causing the following messages to be produced in the application output (I think):
Preparing remote side...
Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers