Greg,
Be careful when you say:
> The Fortrans are compatible enough that a single MPI library can deal
> with all. The calling convention stuff happens to work because MPI
> doesn't happen to have any calls that hit the "f2c abi" issue. The
> underscore thing can be handled with multiple symbols for each entry
> point. -- greg
>
We've just spent several days of debugging a large scientific code
eventually to find that calling a routine with LOGICAL parameters that
was compiled with *pathf90*, from a routine compiled with *pgf90* *does
not work*.
It transpires that the machine representation for fortran logicals are
different between the two compilers, as shown below
TRUE FALSE
pathf90 1 0
pgf90 -1 0
(Note that using pgf90 options -Munixlogical -Mnounixlogical does not
change the value stored by pgf90 logicals)
*This is an example where you have to be very careful coding and using
an ABI.*
Regards
Neil
--
+-----------------+---------------------------------+------------------+
| Neil Storer | Head: Systems S/W Section | Operations Dept. |
+-----------------+---------------------------------+------------------+
| ECMWF, | email: neil.storer_at_[hidden] | //=\\ //=\\ |
| Shinfield Park, | Tel: (+44 118) 9499353 | // \\// \\ |
| Reading, | (+44 118) 9499000 x 2353 | ECMWF |
| Berkshire, | Fax: (+44 118) 9869450 | ECMWF |
| RG2 9AX, | | \\ //\\ // |
| UK | URL: http://www.ecmwf.int/ | \\=// \\=// |
+--+--------------+---------------------------------+----------------+-+
| ECMWF is the European Centre for Medium-Range Weather Forecasts |
+-----------------------------------------------------------------+
|
![[Flag]](../../../../../community/mirrors/flag-us.gif){kind=small}