My last commit was wrong. Here is the correct version.

This commit was SVN r12131.

ompi/mpi/c/get_count.c

@@ -34,12 +34,12 @@ static const char FUNC_NAME[] = "MPI_Get_count";
 
 int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count) 
 {
-   int size = 0;
-   int rc   = MPI_SUCCESS;
+   size_t size = 0;
+   int rc      = MPI_SUCCESS;
 
    if (MPI_PARAM_CHECK) {
       OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
-      OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, count);
+      OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, 1);
 
       OMPI_ERRHANDLER_CHECK(rc, MPI_COMM_WORLD, rc, FUNC_NAME);
    }
@@ -49,7 +49,7 @@ int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count)
          *count = 0;
       } else {
          *count = status->_count / size;
-         if( ((*count) * size) != status->_count )
+         if( (int)((*count) * size) != status->_count )
             *count = MPI_UNDEFINED;
       }
    }