XL Fortran includes the IBM Distributed Debugger, a client-server debugger, which supports the full Fortran 90 and Fortran 95 languages in addition to C, C++, and other languages. The Distributed Debugger can debug programs running on systems accessible through a network connection as well as debug programs running on your workstation. (Other debuggers may provide only partial Fortran 90 or Fortran 95 support.)
For instructions on using your chosen debugger, consult the online help within the debugger or its documentation.
Always specify the -g option when compiling programs for debugging.