re PR c++/51299 ([C++11] erroneous nullptr warning on dynamic cast)

/cp
2011-11-30  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51299
	* rtti.c (ifnonnull): Use nullptr_node.
	(build_dynamic_cast_1): Call cp_truthvalue_conversion instead
	of c_common_truthvalue_conversion.

/testsuite
2011-11-30  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51299
	* g++.dg/warn/Wzero-as-null-pointer-constant-4.C: New.

From-SVN: r181854

gcc/cp/ChangeLog

+2011-11-30  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51299
+	* rtti.c (ifnonnull): Use nullptr_node.
+	(build_dynamic_cast_1): Call cp_truthvalue_conversion instead
+	of c_common_truthvalue_conversion.
+
 2011-11-24  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/51227

gcc/cp/rtti.c

@@ -503,8 +503,8 @@ ifnonnull (tree test, tree result)
 {
   return build3 (COND_EXPR, TREE_TYPE (result),
 		 build2 (EQ_EXPR, boolean_type_node, test,
-			 cp_convert (TREE_TYPE (test), integer_zero_node)),
-		 cp_convert (TREE_TYPE (result), integer_zero_node),
+			 cp_convert (TREE_TYPE (test), nullptr_node)),
+		 cp_convert (TREE_TYPE (result), nullptr_node),
 		 result);
 }
 
@@ -747,7 +747,7 @@ build_dynamic_cast_1 (tree type, tree expr, tsubst_flags_t complain)
 	      tree neq;
 
 	      result = save_expr (result);
-	      neq = c_common_truthvalue_conversion (input_location, result);
+	      neq = cp_truthvalue_conversion (result);
 	      return cp_convert (type,
 				 build3 (COND_EXPR, TREE_TYPE (result),
 					 neq, result, bad));

gcc/testsuite/ChangeLog

+2011-11-30  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51299
+	* g++.dg/warn/Wzero-as-null-pointer-constant-4.C: New.
+
 2011-11-29  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/51247

gcc/testsuite/g++.dg/warn/Wzero-as-null-pointer-constant-4.C

+// PR c++/51299
+// { dg-options "-Wzero-as-null-pointer-constant" }
+
+class Base
+{
+  public:
+  virtual ~Base();
+};
+
+class Derived : public Base
+{
+};
+
+void foo(Base* b)
+{
+  Derived* d = dynamic_cast<Derived*>(b);
+}
+
+void bar(Base& b)
+{
+  Derived& d = dynamic_cast<Derived&>(b);
+}