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Subject: [OMPI users] Debug info on Darwin
From: Peter Thompson (petert_at_[hidden])
Date: 2010-06-04 17:02:43

We've had a couple of reports of users trying to debug with Open MPI and
TotalView on Darwin and not being able to use the classic

mpirun -tv -np 4 ./foo

launch. The typical problem shows up as something like

Can't find typedef for MPIR_PROCDESC

and then TotalView can't attach to the spawned processes. While the
Open MPI build may correctly compile the needed files with -g, the
problem arises in that the DWARF info on Darwin is kept in the .o
files. If these files are kept around, we might be able to find that
info and be happy debugging. But if they are deleted after the build,
or things are moved around, then we are unable to locate the .o files
containing the debug info, and no one is pleased.

It was suggested by our CTO that if these files were compiled as to
produce STABS debug info, rather than DWARF, then the debug info would
be copied into the executables and shared libraries, and we would then
be able to debug with Open MPI without a problem. I'm not sure if this
is the best place to offer that suggestion, but I imagine it's not a bad
place to start. ;-)

Peter Thompson