[MOAB-dev] [PATCH] Call MPI_Init if using MPI.

[Jed Brown]

Jed Brown wrote:
> PETSc's stubs must have been getting included inadvertently, there are
> no symbols because they are just macros.  An alternative is to
> namespace the stubs appropriately.

It's not possible to implement everything as macros.  PETSc only
namespaces the non-macro part of MPIUNI if MPIUNI_AVOID_MPI_NAMESPACE is
defined.  Perhaps that was the issue.

Note that having MPI_Comm in the serial interface is usually okay
because a serial MPI will never reference it (therefore it's okay if the
value gets corrupted because extra bits are ignored).  Of course if you
have a parellel code calling a serial PETSc, you can't rely on the
serial PETSc handing you back valid communicators.

Jed

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