[MPI3 Fortran] What if Fortran is the primary interface?

Jeff Squyres jsquyres at cisco.com
Mon Mar 17 17:18:40 CDT 2008

On Mar 17, 2008, at 6:05 PM, Aleksandar Donev wrote:

> In C, would you make the C Interface:
> void MPI_Send(..., struct MPI_Comm comm,...)


> or do you want
> void MPI_Send(..., struct MPI_Comm *comm,...)

Not this.

In C, the type of MPI_Comm is not defined.  For example, Open MPI and  
HP MPI use pointers (natively), but Intel MPI, MPICH, and others use  

> Either one of these could be translated into an *equivalent* Fortran
> interface, where by equivalence I mean full binary compatibility.

Yes, the ABI problem really stems from the C interface.  :-\

Jeff Squyres
Cisco Systems

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