[MOAB-dev] MPI implementations and SEEK_*

[Jed Brown]

MBProcConfig.hpp has this kludge so that MPICH2 does not complain about
the SEEK_* macros (defined in iostream) conflicting with the MPI symbols
MPI::SEEK_*.

/* MPICH2 will fail if SEEK_* macros are defined
 * because they are also C++ enums. Undefine them
 * when including mpi.h and then redefine them
 * for sanity.
 */
#  ifdef SEEK_SET
#    define MB_SEEK_SET SEEK_SET
#    define MB_SEEK_CUR SEEK_CUR
#    define MB_SEEK_END SEEK_END
#    undef SEEK_SET
#    undef SEEK_CUR
#    undef SEEK_END
#  endif
#include "mpi.h"
#  ifdef MB_SEEK_SET
#    define SEEK_SET MB_SEEK_SET
#    define SEEK_CUR MB_SEEK_CUR
#    define SEEK_END MB_SEEK_END
#    undef MB_SEEK_SET
#    undef MB_SEEK_CUR
#    undef MB_SEEK_END
#  endif


As discussed in this FAQ entry

  http://www.mcs.anl.gov/research/projects/mpich2/support/index.php?s=faqs#cxxseek

an alternative is to define MPICH_IGNORE_CXX_SEEK which will prevent
MPICH2 from defining the MPI::SEEK_* symbols.  Note that MPI_SEEK_* are
always defined.

I mention this because the development version of Open MPI is
complaining about the current hack.  I suggest defining
MPICH_IGNORE_CXX_SEEK and removing the hack.  Note that this also fixes
the order-dependence alluded to in this comment (in MBCore.cpp)

/* Leave MBParallelComm.hpp before mpi.h or MPICH2 will fail
 * because its C++ headers do not like SEEK_* macros.
 */


Jed
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