Thanks, I didn't know about the GUD rewrite. After I wrote my post above, I started work on a GDB mode from scratch. So far, I have the process management and

Thanks, I didn't know about the GUD rewrite. After I wrote my post above, I started work on a GDB mode from scratch. So far, I have the process management and a PEG-based parser (peg.el is great) for MI output working. I'm not sure if you've looked at gdb-mi.el's code, but it was written by a GSoC student and does vile shit like munging MI output with regular expressions so it can be fed to json.el and parsed as valid JSON. In similar lazy fashion, it uses GUD just for process management. I don't feel there's anything worth salvaging or building on in there.