Problem building PNetCDF 1.12.0 with GCC 7.4.0 and OpenMPI-4.0.2

[Carl Ponder]

*On 10/20/19 7:36 PM, Wei-keng Liao wrote:*
>
>     Since you mentioned you have checked file src/include/config.h,
>     could you please let me know whether this line below appears there?
>
>     #define HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 0
>
>     This line shows that PnetCDF configure.ac does check whether the
>     deprecated MPI constant MPI_COMBINER_HVECTOR_INTEGER is still
>     defined in mpi.h. Therefore, that compile error from line 390 of
>     file dtype_decode.c should not happen.
>
>     389 #if defined HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER && HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER
>     390         case MPI_COMBINER_HVECTOR_INTEGER:
>     391 #endif
>
These builds of 1.12.0 have the setting 1

    PGI-19.9_OpenMPI-4.0.1.LLVM/distro/src/include/config.h:#define
    HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 1
    PGI-19.9_OpenMPI-4.0.1/distro/src/include/config.h:#define
    HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 1

and these have the setting 0

    PGI-19.9_OpenMPI-4.0.2.LLVM/distro/src/include/config.h:#define
    HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 0
    PGI-19.9_OpenMPI-4.0.2/distro/src/include/config.h:#define
    HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 0

So going from OpenMPI 4.0.1 -> 4.0.2 caused the change.
In this case

    GCC-7.4.0_OpenMPI-4.0.2/distro/src/include/config.h:#define
    HAVE_DECL_MPI_COMBINER_HVECTOR_INTEGER 1

I had build GCC with the flag suggested by Nick Papior

    --enable-mpi1-compatibility

and the problem went away for my builds of both PNetCDF & Valgrind.
Somehow this had been a problem building with GCC but not PGI.

         -- Carl


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