diff -ur ./include/tr1/shared_ptr.h ../../gcc-4.9.3.patched/libstdc++-v3/include/tr1/shared_ptr.h
--- ./include/tr1/shared_ptr.h	2014-01-02 14:30:10.000000000 -0800
+++ ../../gcc-4.9.3.patched/libstdc++-v3/include/tr1/shared_ptr.h	2016-02-01 22:45:11.808475373 -0800
@@ -188,7 +188,7 @@
       {
         // No memory barrier is used here so there is no synchronization
         // with other threads.
-        return const_cast<const volatile _Atomic_word&>(_M_use_count);
+        return __atomic_load_n(&_M_use_count, __ATOMIC_RELAXED);
       }
 
     private:  
@@ -230,7 +230,7 @@
     _M_add_ref_lock()
     {
       // Perform lock-free add-if-not-zero operation.
-      _Atomic_word __count = _M_use_count;
+      _Atomic_word __count = _M_get_use_count();
       do
 	{
 	  if (__count == 0)