[MPI3 Fortran] [Mpi-comments] MPI 3.0: Fortran 2008 interface - issue with the LOGICAL kind

[Craig Rasmussen]

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 at 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 at cisco.com>
>> To: "<longb at cray.com>" <longb at cray.com>, "MPI-3 Fortran working group" <mpi3-fortran at 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 at 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 at cisco.com
>> For corporate legal information go to:
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>> 
>> 
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> 
> -- 
> Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at 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
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