On Mar 9, 2008, at 4:33 PM, Jeff Squyres wrote:

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In MPI-2 Page 13 Line 33 it says: All MPI names have an MPI_ prefix, and all characters are capitals. However this statement "and all characters are capitals" hasn't any meaning in the Fortran context, right?

My understanding (and I'll repeat again: I'm nowhere near a fortran expert) is that fortran compilers will change subroutine/function/ variable symbols to either all upper case or all lower case (possibly with some additional underscores). I don't know if this is a Fortran standard thing (e.g., if the Fortran standard says that symbols are case-insensitive), or whether it's an implementation thing.

Fortran identifiers are not case sensitive. However you can give a name to a BIND(C) declaration so that the symbol generated is case sensitive and follows the companion C compilers convention on symbol generation. For example, BIND(C, name="MPI_Comm_rank") generated the symbol, _MPI_Comm_rank Cheers, Craig