From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 18 Jan 2023 00:49:55 +0000 (-0700)
Subject: Declare the existence of explicit instantiations.
X-Git-Tag: v9.5.0-rc1~632^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F14698%2Fhead;p=dealii.git

Declare the existence of explicit instantiations.
---

diff --git a/include/deal.II/hp/mapping_collection.h b/include/deal.II/hp/mapping_collection.h
index 650a54d296..c1c22feef7 100644
--- a/include/deal.II/hp/mapping_collection.h
+++ b/include/deal.II/hp/mapping_collection.h
@@ -152,6 +152,7 @@ namespace hp
   };
 
 
+
   /* --------------- inline functions ------------------- */
 
   template <int dim, int spacedim>
@@ -180,6 +181,19 @@ namespace hp
     StaticMappingQ1<dim, spacedim>::mapping_collection =
       MappingCollection<dim, spacedim>(MappingQ1<dim, spacedim>{});
 
+
+#ifndef DOXYGEN
+  // Declare the existence of explicit instantiations of the class
+  // above to avoid certain warnings issues by clang and
+  // newer (LLVM-based) Intel compilers:
+  extern template struct StaticMappingQ1<1, 1>;
+  extern template struct StaticMappingQ1<1, 2>;
+  extern template struct StaticMappingQ1<1, 3>;
+  extern template struct StaticMappingQ1<2, 2>;
+  extern template struct StaticMappingQ1<2, 3>;
+  extern template struct StaticMappingQ1<3, 3>;
+#endif
+
 } // namespace hp