Ah, the joys of finding a kindred spirit on the Mac/XCode development path. From https://apple.stackexchange.com/questions/316880/stop-xcode-from-hijacking-my-file-associations Mark Anderson writes: "The best workaround I've found is to never install the sodding GUI. Use `xcode-select --install` in terminal" It is always a delicate dance between using lldb from the command-line, or dealing with XCode.