For some reason Jeff deleted me from this email list :-) (or perhaps I removed myself one day when the mood moved me) so I haven't seen this thread until today. Basically I agree with Tobias that there is a problem (from a standards perspective) and with Nick that MPI-3 made the right choice with default logical (following past standards as to not break existing code). I also agree with Nick that an implementation of the MPI-3 standard can finesse the issue a bit. I don't know what Bill will think of this but I think the problem should be resolved in the Fortran standard in the end so that LOGICAL(C_INT) is a legal type. This would allow mapping Fortran logical variables to C integers which is the type most C programmers use for logical variables anyway. Does anyone know what size a default logical is in existing compilers? I assume it is the same size as a default integer. Craig Rasmussen CAS Scientific Programmer [email protected] On Feb 26, 2013, at 2:05 PM, Rolf Rabenseifner wrote:

Is TS 29113 changing something in this case? I.e., does TS 29113 allow LOGICAL dummy arguments in BIND(C) subroutines?

Rolf

----- Original Message -----

...

From: "Jeff Squyres (jsquyres)" <[email protected]> To: "<[email protected]>" <[email protected]>, "MPI-3 Fortran working group" <[email protected]> Sent: Tuesday, February 26, 2013 7:04:09 PM Subject: Re: [MPI3 Fortran] [Mpi-comments] MPI 3.0: Fortran 2008 interface - issue with the LOGICAL kind On Feb 26, 2013, at 11:27 AM, Bill Long <[email protected]> wrote:

...

In particular, the C function is not using _Bool. It would seem to be more consistent for the Fortran interface to specify the argument as

INTEGER :: FLAG

or, better

INTEGER(c_int) :: FLAG.

FWIW, the MPI Fortran interfaces have always used LOGICAL for boolean values, not INTEGER. It would be weird to change them now.

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

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-- Dr. Rolf Rabenseifner . . . . . . . . . .. email [email protected] High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307) _______________________________________________ mpi3-fortran mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-fortran