PR c++/71442

	* pt.c (tsubst_copy): Only set TREE_USED on DECLs.

	* g++.dg/cpp0x/Wunused-variable-1.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-5-branch@237234 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/cp/ChangeLog

@@ -1,3 +1,8 @@
+2016-06-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71442
+	* pt.c (tsubst_copy): Only set TREE_USED on DECLs.
+
 2016-06-03  Release Manager
 
 	* GCC 5.4.0 released.

gcc/cp/pt.c

@@ -13287,7 +13287,8 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 	      len = TREE_VEC_LENGTH (expanded);
 	      /* Set TREE_USED for the benefit of -Wunused.  */
 	      for (int i = 0; i < len; i++)
-		TREE_USED (TREE_VEC_ELT (expanded, i)) = true;
+		if (DECL_P (TREE_VEC_ELT (expanded, i)))
+		  TREE_USED (TREE_VEC_ELT (expanded, i)) = true;
 	    }
 
 	  if (expanded == error_mark_node)

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2016-06-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/71442
+	* g++.dg/cpp0x/Wunused-variable-1.C: New test.
+
 2016-06-07  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/71389

gcc/testsuite/g++.dg/cpp0x/Wunused-variable-1.C

@@ -0,0 +1,37 @@
+// PR c++/71442
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wunused-variable" }
+
+struct C
+{
+  template<typename... Ts>
+  int operator()(Ts &&...)
+  {
+    return sizeof...(Ts);
+  }
+};
+
+int
+foo ()
+{
+  C {} (1, 1L, 1LL, 1.0);
+}
+
+template<int N>
+void
+bar ()
+{
+  char a;		// { dg-warning "unused variable" }
+  short b;		// { dg-warning "unused variable" }
+  int c;		// { dg-warning "unused variable" }
+  long d;		// { dg-warning "unused variable" }
+  long long e;		// { dg-warning "unused variable" }
+  float f;		// { dg-warning "unused variable" }
+  double g;		// { dg-warning "unused variable" }
+}
+
+void
+baz ()
+{
+  bar <0> ();
+}