I recommend a change to the standard - I'm sure the Forum intended integer constants to be valid here. Bill On Feb 4, 2011, at 1:18 PM, Jeff Squyres wrote:

Question about MPI_UNDEFINED (and all the constants in the top table in MPI-2.2 p515): its type in C is listed as (const int) or unnamed (enum). But in Open MPI, we have this value in mpi.h as:

#define MPI_UNDEFINED -32766

So does MPICH2.

A #define of an integer constant will work just fine with other const int's, but it technically isn't a const int or unnamed enum.

Are we wrong? Or should I propose a ticket to change the wording of this table from:

C type: const int (or unnamed enum)

to

C type: const int, unnamed enum, or integer constant

(the same issue doesn't exist for the C++ constants -- even though the point is moot with them, since they're deprecated -- because they're in the MPI:: namespace, and therefore really should be const int's or unnamed enum's)

-- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/

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