Getting callstack information

I'd like to know which functions in the code are making the MPI calls shown in the profile. I compiled the code with -g, and still the function or source file names are not shown. What additional steps do I need to take to get that information?
Thanks.

Review mpiP's documented build and profiling steps, starting with the existing -g build and a profile containing MPI calls. Reproduce the report and identify the additional symbol or callstack setup required; done means the profile shows the calling function and source-file names.

Written by the indexing model from the issue text.