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The MPI Forum advises users that "Instead of using mpif.h, the use of the mpi_f08 or mpi module is strongly encouraged" for several reasons (https://www.mpi-forum.org/docs/mpi-3.1/mpi31-report/node411.htm) and that modernizing to use mpi[_f08] is relatively straightforward.

More practically, the current include mpif.h results in a number of Explicit interface or EXTERNAL declaration is required compiler warnings from WW3 in compiling ufs-weather-model, like:

.../ufs-weather-model/WW3/model/src/w3parall.F90(999): warning #8889: Explicit interface or EXTERNAL declaration is required.   [MPI_SEND]
          CALL MPI_SEND(Iarr,1,MPI_INT, IPROC-1, 37, MPI_COMM_WAVE, IERR_MPI)
---------------^
.../ufs-weather-model/WW3/model/src/w3parall.F90(1002): warning #8889: Explicit interface or EXTERNAL declaration is required.   [MPI_SEND]
          CALL MPI_SEND(ipgl_tot,np_global,MPI_INT, IPROC-1, 43, MPI_COMM_WAVE, IERR_MPI)

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Update usage of MPI to use_mpif08 instead of include mpif.h. A branch of dev/ufs-weather-model to take an intermediate step of use_mpi is available at https://github.com/NickSzapiro-NOAA/WW3/tree/compileFix_use_mpi and is bit-for-bit in ufs-weather-model regression tests.

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Disabling the warnings (questionable)

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Needed for ufs-community/ufs-weather-model#2703 and operational implementation