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
rasmus@cas.uoregon.edu




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)" <jsquyres@cisco.com>
To: "<longb@cray.com>" <longb@cray.com>, "MPI-3 Fortran working group" <mpi3-fortran@lists.mpi-forum.org>
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 <longb@cray.com> 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
jsquyres@cisco.com
For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/


_______________________________________________
mpi3-fortran mailing list
mpi3-fortran@lists.mpi-forum.org
http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-fortran

--
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner@hlrs.de
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
mpi3-fortran@lists.mpi-forum.org
http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-fortran