allows mix precision compilation (#56)

* allows mix precision compilation

* remove fms_platform

atmos_shared/atmos_global_diag.F90

@@ -5,6 +5,7 @@ module atmos_global_diag_mod
 !  and then registering and sending this data to the diag_manager.
 !----------------------------------------------------------------------
 
+use platform_mod, only: r8_kind, r4_kind
 use mpp_mod,          only: input_nml_file
 use mpp_domains_mod,  only: domain2d, mpp_global_sum, BITWISE_EFP_SUM, &
                             null_domain2d, operator(.eq.)
@@ -267,7 +268,7 @@ end subroutine buffer_global_diag
 
 function send_global_diag_data (field_num, data, Time, area, mask)
 integer,           intent(in) :: field_num
-real,              intent(in) :: data(:,:)
+real(r8_kind),              intent(in) :: data(:,:)
 type(time_type),   intent(in) :: Time
 real,    optional, intent(in) :: area(:,:)
 logical, optional, intent(in) :: mask(:,:)

atmos_shared/atmos_tracer_driver.F90

@@ -103,6 +103,7 @@ module atmos_tracer_driver_mod
 
 !-----------------------------------------------------------------------
 
+use platform_mod, only: r8_kind, r4_kind
 use     time_manager_mod, only : time_type
 
 implicit none
@@ -377,7 +378,7 @@ subroutine atmos_tracer_driver_gather_data(gas_fields, tr_bot)
 use coupler_types_mod, only: coupler_2d_bc_type
 
 type(coupler_2d_bc_type), intent(inout) :: gas_fields
-real, dimension(:,:,:), intent(in)      :: tr_bot
+real(r8_kind), dimension(:,:,:), intent(in)      :: tr_bot
 
 !-----------------------------------------------------------------------
 
@@ -393,7 +394,7 @@ subroutine atmos_tracer_driver_gather_data_down(gas_fields, tr_bot)
  use coupler_types_mod, only: coupler_2d_bc_type
 
  type(coupler_2d_bc_type), intent(inout) :: gas_fields
- real, dimension(:,:,:), intent(in)      :: tr_bot
+ real(r8_kind), dimension(:,:,:), intent(in)      :: tr_bot
 
  return
 
@@ -414,8 +415,8 @@ function atmos_tracer_has_surf_setl_flux(tr) result(ret)
 ! the atmosphere for this tracer
 subroutine get_atmos_tracer_surf_setl_flux(tr, setl_flux, dsetl_dtr)
   integer, intent(in)  :: tr         ! tracer index
-  real,    intent(out) :: setl_flux(:,:) ! sedimentation flux at the bottom of the atmosphere
-  real,    intent(out) :: dsetl_dtr(:,:) ! derivative of sedimentation flux w.r.t.
+  real(r8_kind),    intent(out) :: setl_flux(:,:) ! sedimentation flux at the bottom of the atmosphere
+  real(r8_kind),    intent(out) :: dsetl_dtr(:,:) ! derivative of sedimentation flux w.r.t.
        ! the tracer concentration in the bottom layer
 
   setl_flux(:,:) = 0.0 ; dsetl_dtr(:,:) = 0.0