Fixes #2553. Detect mpiuni builds of ESMF

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
+
 - Convert from ABI Fixed Grid to lon/lat coordinates used in MAPL_XYGridFactory (supporting geostationary GOES-R series)
 - Modify trajectory sampler for a collection with multiple platforms: P3B (air craft) + FIREX
 - Modify swath sampler to handle two Epoch swath grids
@@ -16,8 +17,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - parse "GOCART::CO2" from 'geovals_fields' entry in PLATFORM
 - Add call MAPL_InitializeShmem to ExtDataDriverGridComp.F90
 - Read swath data on root, call MAPL_CommsBcast [which sends data to Shmem (when Shmem initialized) or to MAPL_comm otherwise]. This approach avoids race in reading nc files [e.g. 37 files for 3 hr swath data]
-
-
 - Added memory utility, MAPL_MemReport that can be used in any code linking MAPL
 - Added capability in XY grid factory to add a mask to the grid any points are missing needed for geostationary input data
 - Added capability in the MAPL ESMF regridding wrapper to apply a destination mask if the destination grid contains a mask
@@ -41,6 +40,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Explictly `use` some `iso_c_binding` types previously pulled in through ESMF. This is fixed in future ESMF versions (8.7+) and so
   we anticipate this here
 - Add explicit `Fortran_MODULE_DIRECTORY` to `CMakeLists.txt` in benchmarks to avoid race condition in Ninja builds
+- Add check to make sure ESMF was not built as `mpiuni`
 
 ### Removed
 

gridcomps/Cap/MAPL_Cap.F90

@@ -275,6 +275,8 @@ subroutine run_model(this, comm, unusable, rc)
       integer :: status
       class(Logger), pointer :: lgr
       logical :: file_exists
+      type (ESMF_VM) :: VM
+      character(len=:), allocatable :: esmfComm
 
       _UNUSED_DUMMY(unusable)
 
@@ -298,6 +300,11 @@ subroutine run_model(this, comm, unusable, rc)
          call ESMF_Initialize (logKindFlag=this%cap_options%esmf_logging_mode, mpiCommunicator=comm, _RC)
       end if
 
+      ! We check to see if ESMF_COMM was built as mpiuni which is not allowed for MAPL
+      call ESMF_VmGetCurrent(VM, _RC)
+      call ESMF_VmGet(VM, esmfComm = esmfComm, _RC)
+      _ASSERT( esmfComm /= 'mpiuni', 'ESMF_COMM=mpiuni is not allowed for MAPL')
+
       ! Note per ESMF this is a temporary routine as eventually MOAB will
       ! be the only mesh generator. But until then, this allows us to
       ! test it