diff --git a/include/algorithm b/include/algorithm
index e003a59e3..02cbc816f 100644
--- a/include/algorithm
+++ b/include/algorithm
@@ -1327,7 +1327,7 @@ __is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
                  forward_iterator_tag, forward_iterator_tag )
 {
     // shorten sequences as much as possible by lopping of any equal parts
-    for (; __first1 != __last1 && __first2 != __last2; ++__first1, ++__first2)
+    for (; __first1 != __last1 && __first2 != __last2; ++__first1, (void) ++__first2)
         if (!__pred(*__first1, *__first2))
             goto __not_done;
     return __first1 == __last1 && __first2 == __last2;
diff --git a/test/support/test_iterators.h b/test/support/test_iterators.h
index 71509083e..b91653dc9 100644
--- a/test/support/test_iterators.h
+++ b/test/support/test_iterators.h
@@ -13,6 +13,12 @@
 #include <iterator>
 #include <cassert>
 
+#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
+#define DELETE_FUNCTION = delete
+#else
+#define DELETE_FUNCTION
+#endif
+
 template <class It>
 class output_iterator
 {
@@ -40,7 +46,7 @@ public:
         {output_iterator tmp(*this); ++(*this); return tmp;}
 
     template <class T>
-    void operator,(T const &);
+    void operator,(T const &) DELETE_FUNCTION;
 };
 
 template <class It>
@@ -76,7 +82,7 @@ public:
         {return !(x == y);}
 
     template <class T>
-    void operator,(T const &);
+    void operator,(T const &) DELETE_FUNCTION;
 };
 
 template <class T, class U>
@@ -128,7 +134,7 @@ public:
         {return !(x == y);}
 
     template <class T>
-    void operator,(T const &);
+    void operator,(T const &) DELETE_FUNCTION;
 };
 
 template <class T, class U>
@@ -179,7 +185,7 @@ public:
         {bidirectional_iterator tmp(*this); --(*this); return tmp;}
 
     template <class T>
-    void operator,(T const &);
+    void operator,(T const &) DELETE_FUNCTION;
 };
 
 template <class T, class U>
@@ -241,7 +247,7 @@ public:
     reference operator[](difference_type n) const {return it_[n];}
 
     template <class T>
-    void operator,(T const &);
+    void operator,(T const &) DELETE_FUNCTION;
 };
 
 template <class T, class U>
@@ -423,4 +429,6 @@ inline Iter base(comma_iterator<Iter> i) { return i.base(); }
 template <class Iter>    // everything else
 inline Iter base(Iter i) { return i; }
 
+#undef DELETE_FUNCTION
+
 #endif  // ITERATORS_H