Fix type mismatch compiler error when gfortran 10 is used without '-fallow-argument-mismatch' flag

cellular_automata_global.F90

@@ -11,6 +11,7 @@ subroutine cellular_automata_global(kstep,restart,first_time_step,ca1_cpl,ca2_cp
             nca,ncells,nlives,nfracseed,nseed,iseed_ca, mytile, &
             ca_smooth,nspinup,blocksize,nsmooth,ca_amplitude,mpiroot,mpicomm)
 
+use mpi_f08
 use kinddef,           only: kind_dbl_prec, kind_phys
 use update_ca,         only: update_cells_global,define_ca_domain
 use halo_exchange,     only: atmosphere_scalar_field_halo
@@ -30,7 +31,8 @@ subroutine cellular_automata_global(kstep,restart,first_time_step,ca1_cpl,ca2_cp
 
 !This program evolves a cellular automaton uniform over the globe 
 
-integer,              intent(in)    :: kstep,ncells,nca,nlives,nseed,nspinup,nsmooth,mpiroot,mpicomm
+integer,              intent(in)    :: kstep,ncells,nca,nlives,nseed,nspinup,nsmooth,mpiroot
+type(MPI_Comm),       intent(in)    :: mpicomm
 integer(kind=kind_dbl_prec),  intent(in)    :: iseed_ca
 integer,              intent(in)    :: mytile
 real(kind=kind_phys), intent(in)    :: nfracseed,ca_amplitude

cellular_automata_sgs.F90

@@ -12,6 +12,7 @@ subroutine cellular_automata_sgs(kstep,dtf,restart,first_time_step,sst,lsmsk,lak
             nca,ncells,nlives,nfracseed,nseed,iseed_ca,ca_advect, &
             nspinup,ca_trigger,blocksize,mpiroot,mpicomm)
 
+use mpi_f08
 use kinddef,           only: kind_phys,kind_dbl_prec
 use update_ca,         only: update_cells_sgs, define_ca_domain
 use random_numbers,    only: random_01_CB
@@ -44,7 +45,8 @@ subroutine cellular_automata_sgs(kstep,dtf,restart,first_time_step,sst,lsmsk,lak
 !CA_DEEP can be either number of plumes in a cluster (nca_plumes=true) or updraft 
 !area fraction (nca_plumes=false)
 
-integer,intent(in) :: kstep,ncells,nca,nlives,nseed,nspinup,mpiroot,mpicomm,mytile
+integer,intent(in) :: kstep,ncells,nca,nlives,nseed,nspinup,mpiroot,mytile
+type(MPI_Comm),intent(in) :: mpicomm
 integer(kind=kind_dbl_prec),           intent(in)    :: iseed_ca
 real(kind=kind_phys), intent(in)    :: nfracseed,dtf,nthresh
 logical,intent(in) :: restart,ca_trigger,first_time_step,ca_advect

mpi_wrapper.F90

@@ -1,5 +1,7 @@
 module mpi_wrapper
 
+   use mpi_f08
+
    implicit none
 
    private
@@ -9,12 +11,10 @@ module mpi_wrapper
    public :: mp_reduce_min, mp_reduce_max, mp_reduce_sum
    public :: mp_bcst, mp_alltoall
 
-#include "mpif.h"
-
    integer, save :: mype = -999
    integer, save :: npes = -999
    integer, save :: root = -999
-   integer, save :: comm = -999
+   type(MPI_Comm), save :: comm
    logical, save :: initialized = .false.
 
    integer :: ierror
@@ -78,7 +78,8 @@ logical function is_rootpe()
    end function is_rootpe
 
    subroutine mpi_wrapper_initialize(mpiroot, mpicomm)
-      integer, intent(in) :: mpiroot, mpicomm
+      integer, intent(in) :: mpiroot
+      type(MPI_Comm), intent(in) :: mpicomm
       if (initialized) return
       root = mpiroot
       comm = mpicomm
@@ -92,7 +93,7 @@ subroutine mpi_wrapper_finalize()
       mype = -999
       npes = -999
       root = -999
-      comm = -999
+      comm%mpi_val = -999
       initialized = .false.
    end subroutine mpi_wrapper_finalize
 

stochastic_physics.F90

@@ -2,6 +2,7 @@
 !! the stochastic physics random pattern generators
 module stochastic_physics
 
+use mpi_f08
 use kinddef, only : kind_phys, kind_dbl_prec
 
 implicit none
@@ -40,7 +41,8 @@ subroutine init_stochastic_physics(levs, blksz, dtp, sppt_amp, input_nml_file_in
 
 ! Interface variables
 
-integer,                  intent(in)    :: levs, nlunit, nthreads, mpiroot, mpicomm
+integer,                  intent(in)    :: levs, nlunit, nthreads, mpiroot
+type(MPI_Comm),           intent(in)    :: mpicomm
 integer,                  intent(in)    :: blksz(:)
 real(kind=kind_phys), intent(in)    :: dtp
 real(kind=kind_phys), intent(out)   :: sppt_amp
@@ -280,8 +282,10 @@ subroutine init_stochastic_physics_ocn(delt,geoLonT,geoLatT,nx,ny,nz,pert_epbl_i
 
 real :: dx
 integer :: k,latghf,km
+type(MPI_Comm) :: mpicomm_t ! FIXME once MOM6 updates to use mpi_f90 types
 rad2deg=180.0/con_pi
-call mpi_wrapper_initialize(mpiroot,mpicomm)
+mpicomm_t%mpi_val = mpicomm
+call mpi_wrapper_initialize(mpiroot,mpicomm_t)
 gis_stochy_ocn%nodes = npes
 gis_stochy_ocn%mype = mype
 gis_stochy_ocn%nx=nx