The LLVM source repository includes a patch adding basic lldb support to gud.el. The patch adapted to current gud.el (Github-mirror commit 7e09ef09a479731d01b1ca46e94ddadd73ac98e3) is attached below. Although I’m not affiliated with llvm.org , I’d be interested to know if and how this might be accepted into the Emacs distribution, RMS’s opinion of LLVM notwithstanding. Thank you! -AM