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.sto...@ecmwf.int | //=\\ //=\\ |
| 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 |
+-----------------------------------------------------------------+
