[Mpi-22] MPI-2.1 ambiguity?

[Jeff Squyres]

On Jul 16, 2008, at 11:24 AM, William Gropp wrote:

> One piece of relevant text in MPI 2.0 is in section 4.12.6 (in  
> MPI-2.0) says that "All predefined datatypes can be used in datatype  
> constructors in any language."  However, the example uses  
> MPI_Type_f2c ton convert the Fortran handle to the C version before  
> passing it into the MPI_Type_create_struct routine, so this text  
> could be interpreted as allowing the use of those datatypes through  
> the handle conversion mechanism without requiring them to be defined  
> in each languages header file.  Presumably the requirement is that  
> they be predefined with the value that you'd get from the handle  
> conversion function?

The text in Annex B is stronger than that, though.  It specifically  
states "they are therefore defined for all three language bindings" --  
is that a mistake?

>>> 2. Section 3.2.2 on page 27, Section 16.1.6 on page 453, and Annex  
>>> A.1
>>> on page 491.
>>> MPI_LONG_LONG_INT, MPI_LONG_LONG (as synonym),  
>>> MPI_UNSIGNED_LONG_LONG,
>>> MPI_SIGNED_CHAR, and MPI_WCHAR are moved from optional to official  
>>> and they
>>> are therefore defined for all three language bindings.


-- 
Jeff Squyres
Cisco Systems