Mark a function argument as unused.

diff --git a/source/grid/tria_description.cc b/source/grid/tria_description.cc
index 38a72577e78d369805816b349f6abc2828cd24d7..45fe8b95ce627fb2f3ed550c5b5cc73ae840550e 100644 (file)
--- a/source/grid/tria_description.cc
+++ b/source/grid/tria_description.cc
@@ -448,6 +448,8 @@ namespace TriangulationDescription
             construction_data.smoothing = tria.get_mesh_smoothing();
             construction_data.settings  = settings;
           }
+        else
+          (void)comm;
 
         // helper function, which collects all vertices belonging to a cell
         // (also taking into account periodicity)