Bug#686926: liboctave-dev: creates broken .oct files when the OpenMPI flavor of HDF5 (libhdf5-openmpi-dev) is installed

[Bradley M. Froehle]

The fix for this bug provided in 1.8.9-1~exp2 has cause me a good deal of
headache today.

For me, the issue is triggered as some C++ code containing:

#include <hdf5.h>   // sets OMPI_SKIP_MPICXX 1
#include <mpi.h>  // MPI C++ namespace now is NOT available

Note that even trying to unset OMPI_SKIP_MPICXX before including mpi.h
won't work
because OMPI_MPI_H will still be defined and the mpi.h header won't be
processed again.

I respectfully request that this patch be backed out until a better
solution can be
worked out.  Totally disabling the MPI C++ bindings when including HDF5 is
not
an acceptable side effect.

Regards,
Brad
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