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On Wed, Sep 12, 2007 at 01:20:13PM -0600, Ed Hartnett wrote: > You must use the --enable-parallel option to configure. Hi Ed, this didn't seem to make any difference. config.h has this alarming section: /* if true, parallel netCDF-4 is in use */ #define USE_PARALLEL 1 /* if true, compile in parallel netCDF-4 based on MPI/IO */ /* #undef USE_PARALLEL_MPIO */ /* if true, compile in parallel netCDF-4 based on MPI/POSIX */ #define USE_PARALLEL_POSIX 1 When I take a closer look at config.log, the check for MPI-IO (POSIX) succedds but the check for "real" MPI-IO fails: configure:29033: checking for H5Pget_fapl_mpiposix in -lhdf5 configure:29068: /home/robl/work/soft/hdf5-1.8.0-beta3/bin/h5pcc -o conftest -g -O2 -I/home/robl/work/soft/hdf5-1.8.0-beta3/include -L/home/robl/work/soft/hdf5-1.8.0-beta3/lib conftest.c -lhdf5 -lhdf5_hl -lhdf5 -lm -lz -lhdf5 >&5 configure:29074: $? = 0 configure:29092: result: yes configure:29107: checking for H5Pget_fapl_mpipo in -lhdf5 configure:29142: /home/robl/work/soft/hdf5-1.8.0-beta3/bin/h5pcc -o conftest -g -O2 -I/home/robl/work/soft/hdf5-1.8.0-beta3/include -L/home/robl/work/soft/hdf5-1.8.0-beta3/lib conftest.c -lhdf5 -lhdf5_hl -lhdf5 -lm -lz -lhdf5 >&5 conftest.o: In function `main': /home/robl/work/netcdf-4.0-beta1/build/conftest.c:67: undefined reference to `H5Pget_fapl_mpipo' collect2: ld returned 1 exit status On Wed, Sep 12, 2007 at 02:31:23PM -0500, Elena Pourmal wrote: > Did HDF5 tests pass? There should be no difference between building > NetCDF-4 and HDF5 tests..... I can build the HDF5 tests no problem, but the HDF5 tests aren't trying to use the symbol "H5Pget_fapl_mpipo". Instead, they use "H5Pget_fapl_mpiposix" > Also you may try to remove -O2 flag. The error you are getting, > doesn't make any sense (at least to me :-) ) The preprocessor suggests that something somewhere is defining MPI_Comm and MPI_Info to be ints before including mpi.h Thanks for all the help. I bet we're pretty close! ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Lab, IL USA B29D F333 664A 4280 315B