Constructors of wrapper SolverCG for PETSc and Trilinos have different interaces

diff --git a/examples/step-40/step-40.cc b/examples/step-40/step-40.cc
index c0e7ed930b06330e2e543cf444f8b74b9cb4e2f5..d92c47423a6f2063f2a28b319d0ba2dfcfa4025e 100644 (file)
--- a/examples/step-40/step-40.cc
+++ b/examples/step-40/step-40.cc
@@ -467,7 +467,12 @@ namespace Step40
 
     SolverControl solver_control (dof_handler.n_dofs(), 1e-12);
 
+#ifdef USE_PETSC_LA
     LA::SolverCG solver(solver_control, mpi_communicator);
+#else
+    LA::SolverCG solver(solver_control);
+#endif
+
     LA::MPI::PreconditionAMG preconditioner;
 
     LA::MPI::PreconditionAMG::AdditionalData data;