Index: boost/archive/iterators/transform_width.hpp
===================================================================
--- boost/archive/iterators/transform_width.hpp	(revision 84235)
+++ boost/archive/iterators/transform_width.hpp	(working copy)
@@ -112,6 +112,9 @@
     transform_width(BOOST_PFTO_WRAPPER(T) start) : 
         super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start)))),
         m_buffer_out_full(false),
+        m_buffer_in(0), /* To disable GCC warning, but not truly necessary
+                           (m_buffer_in will be initialized later before being
+                           used because m_remaining_bits == 0) */
         m_remaining_bits(0),
         m_end_of_sequence(false)
     {}
@@ -119,8 +122,8 @@
     transform_width(const transform_width & rhs) : 
         super_t(rhs.base_reference()),
         m_buffer_out_full(rhs.m_buffer_out_full),
+        m_buffer_in(rhs.m_buffer_in),
         m_remaining_bits(rhs.m_remaining_bits),
-        m_buffer_in(rhs.m_buffer_in),
         m_end_of_sequence(false)
     {}
 };