Index: gcc/alloc-pool.h
===================================================================
--- gcc/alloc-pool.h	(revision 223973)
+++ gcc/alloc-pool.h	(working copy)
@@ -359,7 +359,7 @@
   gcc_checking_assert (m_initialized);
 
   allocation_pool_list *header;
-  int size;
+  int size ATTRIBUTE_UNUSED;
   size = m_elt_size - offsetof (allocation_object<T>, u.data);
 
 #ifdef ENABLE_CHECKING