From 79883bf93a61cdb605fcff1f80b352047f356da7 Mon Sep 17 00:00:00 2001
From: David Wells <drwells@email.unc.edu>
Date: Fri, 3 Jun 2022 11:28:16 -0400
Subject: [PATCH] Initialize MPI with step-77.

SUNDIALS duplicates communicators even in serial.
---
 examples/step-77/step-77.cc | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/examples/step-77/step-77.cc b/examples/step-77/step-77.cc
index 3f8a5bc379..38c5559a73 100644
--- a/examples/step-77/step-77.cc
+++ b/examples/step-77/step-77.cc
@@ -29,6 +29,7 @@
 
 #include <deal.II/base/quadrature_lib.h>
 #include <deal.II/base/function.h>
+#include <deal.II/base/mpi.h>
 #include <deal.II/base/timer.h>
 #include <deal.II/base/utilities.h>
 
@@ -640,11 +641,19 @@ namespace Step77
 } // namespace Step77
 
 
-int main()
+int main(int argc, char **argv)
 {
   try
     {
       using namespace Step77;
+#ifdef DEAL_II_WITH_MPI
+      dealii::Utilities::MPI::MPI_InitFinalize mpi_initialization(argc,
+                                                                  argv,
+                                                                  1);
+#else
+      (void)argc;
+      (void)argv;
+#endif
 
       MinimalSurfaceProblem<2> laplace_problem_2d;
       laplace_problem_2d.run();
-- 
2.39.5