fix the build

tests/TestPoissonSolver.cpp

@@ -20,23 +20,21 @@ int main(int argc, char **argv)
 {
     // Initialize MPI
     Utilities::startup( argc, argv );
-    
+    Utilities::MPI comm( MPI_COMM_WORLD );
+    int rank = comm.getRank();
+    int nprocs = comm.getSize();    
     {// Limit scope so variables that contain communicators will free before MPI_Finialize
 
-        MPI_Comm comm;
-        MPI_Comm_dup(MPI_COMM_WORLD,&comm);
-        int rank = comm_rank(comm);
-        int nprocs = comm_size(comm);
-
         if (rank == 0){
             printf("********************************************************\n");
             printf("Running Test for LB-Poisson Solver \n");
             printf("********************************************************\n");
         }
-        // Initialize compute device
-        ScaLBL_SetDevice(rank);
-        ScaLBL_DeviceBarrier();
-        MPI_Barrier(comm);
+		// Initialize compute device
+		int device=ScaLBL_SetDevice(rank);
+        NULL_USE( device );
+		ScaLBL_DeviceBarrier();
+		comm.barrier();
 
         PROFILE_ENABLE(1);
         //PROFILE_ENABLE_TRACE();
@@ -69,9 +67,6 @@ int main(int argc, char **argv)
         PROFILE_SAVE("TestPoissonSolver",1);
         // ****************************************************
         
-        MPI_Barrier(comm);
-        MPI_Comm_free(&comm);
-
     } // Limit scope so variables that contain communicators will free before MPI_Finialize
 
     Utilities::shutdown();