re PR libstdc++/65352 (array<T,0>::begin()/end() etc. forms a null reference and…

re PR libstdc++/65352 (array<T,0>::begin()/end() etc. forms a null reference and breaks on clang+ubsan)

	PR libstdc++/65352
	* include/profile/array (array::data): Use _S_ptr.
	* include/debug/array (array::data): Likewise.

From-SVN: r223838

libstdc++-v3/ChangeLog

 2015-05-28  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/65352
+	* include/profile/array (array::data): Use _S_ptr.
+	* include/debug/array (array::data): Likewise.
+
+	PR libstdc++/65352
 	* include/std/array (__array_traits::_S_ptr): New function.
 	(array::data): Use _S_ptr to avoid creating invalid reference.
 	* testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust

libstdc++-v3/include/debug/array

@@ -216,11 +216,11 @@ namespace __debug
 
       pointer
       data() noexcept
-      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }
+      { return _AT_Type::_S_ptr(_M_elems); }
 
       const_pointer
       data() const noexcept
-      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }
+      { return _AT_Type::_S_ptr(_M_elems); }
     };
 
   // Array comparisons.

libstdc++-v3/include/profile/array

@@ -178,11 +178,11 @@ namespace __profile
 
       pointer
       data() noexcept
-      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }
+      { return _AT_Type::_S_ptr(_M_elems); }
 
       const_pointer
       data() const noexcept
-      { return std::__addressof(_AT_Type::_S_ref(_M_elems, 0)); }
+      { return _AT_Type::_S_ptr(_M_elems); }
     };
 
   // Array comparisons.