I would also like to have a fully native gdb for QNX (7.1 in my case).

Some things I know:

There is a project rocgdb which may support qnx and might be able to be used for x86 targets. I've not tried this and am interested in any feedback from anyone that's used this.

There is a github project rpdebug that communications with pdebug to dump memory addresses. I have not seen a full API documented for pdebug. https://github.com/mandiant/rpdebug_qnx