I've just run into this chunk of code. /* 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
MPICH2 (1.1.0a1) gives these errors if SEEK_* are present: /opt/mpich2/include/mpicxx.h:26:2: error: #error "SEEK_SET is #defined but must not be for the C++ binding of MPI" /opt/mpich2/include/mpicxx.h:30:2: error: #error "SEEK_CUR is #defined but must not be for the C++ binding of MPI" /opt/mpich2/include/mpicxx.h:35:2: error: #error "SEEK_END is #defined but must not be for the C++ binding of MPI" but when SEEK_* is not present and iostream has been included, OMPI-dev gives these errors. /home/ompi/include/openmpi/ompi/mpi/cxx/mpicxx.h:53: error: ‘SEEK_SET’ was not declared in this scope /home/ompi/include/openmpi/ompi/mpi/cxx/mpicxx.h:54: error: ‘SEEK_CUR’ was not declared in this scope /home/ompi/include/openmpi/ompi/mpi/cxx/mpicxx.h:55: error: ‘SEEK_END’ was not declared in this scope There is a subtle difference between OMPI 1.2.7 and -dev at least with GCC 4.3.2. If iostream was included before mpi.h and then SEEK_* are #undef'd then 1.2.7 succeeds while -dev fails with the message above. If stdio.h is included and SEEK_* are #undef'd then both OMPI versions fail. MPICH2 requires in both cases that SEEK_* be #undef'd. What do you recommend to remain portable? Is this really an MPICH2 issue? The standard doesn't seem to address this issue. The MPICH2 FAQ has this http://www.mcs.anl.gov/research/projects/mpich2/support/index.php?s=faqs#cxxseek Jed
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