Index: lib/Target/Hexagon/RDFGraph.h
===================================================================
--- lib/Target/Hexagon/RDFGraph.h
+++ lib/Target/Hexagon/RDFGraph.h
@@ -924,10 +924,6 @@
     return MM;
   }
 
-  template <typename T> struct Print;
-  template <typename T>
-  raw_ostream &operator<< (raw_ostream &OS, const Print<T> &P);
-
   template <typename T>
   struct Print {
     Print(const T &x, const DataFlowGraph &g) : Obj(x), G(g) {}
@@ -942,6 +938,44 @@
       : Print<NodeAddr<T>>(x, g) {}
   };
 
+  template <typename T>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<T> &P) = delete;
+
+  // Explicit specializations in RDFGraph.cpp. There is an additional explicit
+  // specialization in RDFLiveness.cpp; it is declared in RDFLiveness.h.
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<RegisterRef> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeId> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<DefNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<UseNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<PhiUseNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<RefNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeList> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeSet> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<PhiNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<StmtNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<InstrNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<BlockNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<NodeAddr<FuncNode*>> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<RegisterSet> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<RegisterAggr> &P);
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<DataFlowGraph::DefStack> &P);
+
 } // end namespace rdf
 
 } // end namespace llvm
Index: lib/Target/Hexagon/RDFLiveness.h
===================================================================
--- lib/Target/Hexagon/RDFLiveness.h
+++ lib/Target/Hexagon/RDFLiveness.h
@@ -142,6 +142,10 @@
         unsigned Nest, unsigned MaxNest);
   };
 
+  // Explicit specialization in RDFLiveness.cpp; primary template in RDFGraph.h.
+  template<>
+  raw_ostream &operator<< (raw_ostream &OS, const Print<Liveness::RefMap> &P);
+
 } // end namespace rdf
 
 } // end namespace llvm