vchoi_fork

[svn-r11459] Purpose:
A bug fix

Description:
MPI_Status_IGNORE is treated as a NULL pointer for mpich 1.2.4 or similar MPI packages.
It caused segmentation fault for MPI derived datatype test.


Solution:
Define MPI_STATUS status,
and pass &status into MPI_File_read and MPI_File_write.

Platforms tested:
too trivial to test.

Misc. update: