re PR c++/51196 (FAIL: g++.dg/cpp0x/Wzero-as-null-pointer-constant-1.C)

2011-11-22  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/51196
	* typeck.c (cp_build_binary_op, [case EQ_EXPR]): For targets having
	TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta, do here
	the -Wzero-as-null-pointer-constant warning for pmf == 0.

From-SVN: r181620

gcc/cp/ChangeLog

+2011-11-22  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/51196
+	* typeck.c (cp_build_binary_op, [case EQ_EXPR]): For targets having
+	TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta, do here
+	the -Wzero-as-null-pointer-constant warning for pmf == 0.
+
 2011-11-21  Torvald Riegel  <triegel@redhat.com>
 
 	* pt.c (tsubst_copy_and_build): Handle TRANSACTION_EXPR.

gcc/cp/typeck.c

@@ -4056,6 +4056,13 @@ cp_build_binary_op (location_t location,
 					    delta0,
 				            integer_one_node,
 					    complain);
+	      
+	      if ((complain & tf_warning)
+		  && c_inhibit_evaluation_warnings == 0
+		  && !NULLPTR_TYPE_P (TREE_TYPE (op1)))
+		warning (OPT_Wzero_as_null_pointer_constant,
+			 "zero as null pointer constant");
+
 	      e2 = cp_build_binary_op (location,
 				       EQ_EXPR, e2, integer_zero_node,
 				       complain);