The macOS version of CLion provides two bundled debuggers at your choice: LLDB (by default) and GDB. Currently, the bundled versions are LLDB v 5.0 and GDB v 8.0.1. If you decide for a custom GDB, the versions supported are 7.8.x-8.1.x.
To change the debugger, do the following:
Navigate to Preferences | Build, Execution, Deployment | Toolchains.
In Debugger section of the right pane, select the desired debugger.
