Index: stl_tempbuf.h
===================================================================
--- stl_tempbuf.h	(revision 151122)
+++ stl_tempbuf.h	(working copy)
@@ -182,6 +182,7 @@
     : _M_original_len(std::distance(__first, __last)),
       _M_len(0), _M_buffer(0)
     {
+      pointer __cur(0);
       __try
 	{
 	  std::pair<pointer, size_type> __p(std::get_temporary_buffer<
@@ -189,10 +190,31 @@
 	  _M_buffer = __p.first;
 	  _M_len = __p.second;
 	  if (!__is_pod(_Tp) && _M_len > 0)
-	    std::uninitialized_fill_n(_M_buffer, _M_len, *__first);
+	  {
+	    // The following code fills an uninitalised buffer of
+	    // value_type, where value_type does not have to be copy or
+	    // default constructable.
+	    //
+	    // We do this by move constructing an already existing object
+	    // of type value_type (*__first) to the beginning of the buffer,
+	    // then move constructing each item in the buffer from the previous
+	    // one. This moves our original object along the buffer, leaving a
+	    // list of constructed, moved-from objects.
+	    // Finally at the end we move the value back to *__first.
+	    ::new(static_cast<void*>(_M_buffer))
+		value_type(_GLIBCXX_MOVE(*__first));
+	    for(__cur = _M_buffer + 1; __cur != _M_buffer + _M_len; ++__cur)
+	    {
+	      ::new(static_cast<void*>(__cur))
+		  value_type(_GLIBCXX_MOVE(*(__cur - 1)));
+	    }
+	    *__first = _GLIBCXX_MOVE(*(_M_buffer + _M_len - 1));
+	  }
 	}
       __catch(...)
 	{
+	  if(__cur)
+	    _Destroy(_M_buffer, __cur);
 	  std::return_temporary_buffer(_M_buffer);
 	  _M_buffer = 0;
 	  _M_len = 0;