[MPI3 Fortran] Results of San Jose Forum meeting

[N.M. Maclaren]

On Mar 13 2010, Rolf Rabenseifner wrote:
>
>a short question: If an MPI library implementation declares the
>MPI routines as bind C, is then the internal call mechanism
>standardized?

Not at present, because the current BIND(C) mechanism isn't powerful
enough.

>Or identical with all C compilers because the handle call by
>reference for integers and structurs identical? 

Not necessarily.  In particular, you bring in the dreaded alignment
issue.  While it does not say so, the C standard requires the
alignment of all structures to be a multiple of that of integers.
So a pointer to a structure starting with an integer can be cast to
a pointer to an integer, but not conversely.

Regards,
Nick Maclaren.