re PR c++/47705 (internal compiler error: in convert_nontype_argument, at cp/pt.c:5006)

	PR c++/47705
	* pt.c (convert_nontype_argument): Don't crash on non-pointer
	argument to pointer parameter.

From-SVN: r170782

gcc/cp/ChangeLog

 2011-03-08  Jason Merrill  <jason@redhat.com>
 
+	PR c++/47705
+	* pt.c (convert_nontype_argument): Don't crash on non-pointer
+	argument to pointer parameter.
+
 	PR c++/45651
 	* pt.c (instantiate_decl): Don't clear DECL_INTERFACE_KNOWN on
 	!TREE_PUBLIC decls.

gcc/cp/pt.c

@@ -5369,15 +5369,20 @@ convert_nontype_argument (tree type, tree expr, tsubst_flags_t complain)
 	 qualification conversion. Let's strip everything.  */
       else if (TYPE_PTROBV_P (type))
 	{
-	  STRIP_NOPS (expr);
-	  gcc_assert (TREE_CODE (expr) == ADDR_EXPR);
-	  gcc_assert (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE);
-	  /* Skip the ADDR_EXPR only if it is part of the decay for
-	     an array. Otherwise, it is part of the original argument
-	     in the source code.  */
-	  if (TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == ARRAY_TYPE)
-	    expr = TREE_OPERAND (expr, 0);
-	  expr_type = TREE_TYPE (expr);
+	  tree sub = expr;
+	  STRIP_NOPS (sub);
+	  if (TREE_CODE (sub) == ADDR_EXPR)
+	    {
+	      gcc_assert (TREE_CODE (TREE_TYPE (sub)) == POINTER_TYPE);
+	      /* Skip the ADDR_EXPR only if it is part of the decay for
+		 an array. Otherwise, it is part of the original argument
+		 in the source code.  */
+	      if (TREE_CODE (TREE_TYPE (TREE_OPERAND (sub, 0))) == ARRAY_TYPE)
+		expr = TREE_OPERAND (sub, 0);
+	      else
+		expr = sub;
+	      expr_type = TREE_TYPE (expr);
+	    }
 	}
     }
 

gcc/testsuite/ChangeLog

 2011-03-08  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/template/nontype21.C: New.
+
 	* g++.dg/template/anon5.C: New.
 
 2011-03-08  Jakub Jelinek  <jakub@redhat.com>

gcc/testsuite/g++.dg/template/nontype21.C

+// PR c++/47705
+
+template<char const * const x> class Something { };
+
+extern char const xyz;
+
+class SomethingElse:public Something<xyz> { }; // { dg-error "const char *" }