On Thu, Feb 18, 2016 at 11:06 AM, Bill Long <longb@cray.com> wrote:

On Feb 18, 2016, at 11:55 AM, Jeff Hammond <jeff.science@gmail.com> wrote:

> From MPI 3.1, page 674:
>
> "If an accompanying C++ compiler is missing, then the MPI datatypes in this table are not defined."
>
> Please tell me why we want to do something different for Fortran.

I agree that this is a good point. Although an increasingly strange one in the C++ case since the C and C++ compilers are often the identical same compiler these days. The choice of cc or CC just sets a different mode internally.

We still need to be careful, because C99 and C11 are not strict subsets of any ISO C++. And at least one MPI Forum member (Microsoft) has the audacity to not support ISO C at all, except insofar as it is a subset of C++, which is why lots of folks (e.g. MPICH) are limited to C89, which is - as far as I know - a proper subset of C++.

While we do not have C++ bindings and our C bindings are compliant with C89, there is some potential for this to change in the future, particularly if Squyres and Hammond follow-through on their intent to solve the large-count problem with C11/C++98 polymorphism.

</tangent>

Cheers,
Bill

>

Bill Long longb@cray.com
Fortran Technical Support & voice: 651-605-9024
Bioinformatics Software Development fax: 651-605-9142
Cray Inc./ Cray Plaza, Suite 210/ 380 Jackson St./ St. Paul, MN 55101

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Jeff Hammond
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http://jeffhammond.github.io/