re PR c++/66572 (Bogus Wlogical-op warning for operands coming from template instantiations)

	PR c++/66572
	* pt.c (tsubst_copy_and_build): Add warn_logical_op sentinel.

	* g++.dg/warn/Wlogical-op-2.C: New test.

From-SVN: r226120

gcc/cp/ChangeLog

+2015-07-23  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/66572
+	* pt.c (tsubst_copy_and_build): Add warn_logical_op sentinel.
+
 2015-07-23  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/52987

gcc/cp/pt.c

@@ -14917,6 +14917,7 @@ tsubst_copy_and_build (tree t,
       {
 	warning_sentinel s1(warn_type_limits);
 	warning_sentinel s2(warn_div_by_zero);
+	warning_sentinel s3(warn_logical_op);
 	tree op0 = RECUR (TREE_OPERAND (t, 0));
 	tree op1 = RECUR (TREE_OPERAND (t, 1));
 	tree r = build_x_binary_op

gcc/testsuite/ChangeLog

+2015-07-23  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/66572
+	* g++.dg/warn/Wlogical-op-2.C: New test.
+
 2015-07-23  Alexandre Oliva <aoliva@redhat.com>
 
 	PR rtl-optimization/64164

gcc/testsuite/g++.dg/warn/Wlogical-op-2.C

+// PR c++/66572
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wlogical-op" }
+
+struct false_type
+{
+    static constexpr bool value = false;
+};
+
+struct true_type
+{
+    static constexpr bool value = true;
+};
+
+template<typename T>
+struct is_unsigned : false_type {};
+
+template<>
+struct is_unsigned<unsigned> : true_type {};
+
+template<typename T1, typename T2>
+bool foo()
+{
+    return is_unsigned<T1>::value && is_unsigned<T2>::value;
+}
+
+int main()
+{
+    foo<unsigned, unsigned>();
+}