Work around an issue with types only forward declared.

diff --git a/source/lac/trilinos_tpetra_communication_pattern.cc b/source/lac/trilinos_tpetra_communication_pattern.cc
index 9a462334a3080f542613fe9b25b4935cdc44e3a5..a797c628ab194c670068b33e098de5dc1957970f 100644 (file)
--- a/source/lac/trilinos_tpetra_communication_pattern.cc
+++ b/source/lac/trilinos_tpetra_communication_pattern.cc
@@ -49,7 +49,7 @@ namespace LinearAlgebra
                                  const IndexSet &ghost_indices,
                                  const MPI_Comm  communicator)
     {
-      comm = Teuchos::rcpFromRef(communicator);
+      comm = Teuchos::rcpFromUndefRef(communicator);
 
       auto vector_space_vector_map =
         locally_owned_indices.make_tpetra_map_rcp(*comm, false);