diff -pru include/boost/thread/win32/shared_mutex.hpp /mnt/misc/win64/mingw64-x-boost/boost_1_63_0/boost/thread/win32/shared_mutex.hpp
--- include/boost/thread/win32/shared_mutex.hpp	2017-01-19 10:36:42.848867811 -0200
+++ /mnt/misc/win64/mingw64-x-boost/boost_1_63_0/boost/thread/win32/shared_mutex.hpp	2017-01-19 11:04:58.240820262 -0200
@@ -47,9 +47,14 @@ namespace boost
         T interlocked_compare_exchange(T* target,T new_value,T comparand)
         {
             BOOST_STATIC_ASSERT(sizeof(T)==sizeof(long));
-            long const res=BOOST_INTERLOCKED_COMPARE_EXCHANGE(reinterpret_cast<long*>(target),
-                                                              *reinterpret_cast<long*>(&new_value),
-                                                              *reinterpret_cast<long*>(&comparand));
+#ifdef __GNUC__
+            typedef long __attribute__((__may_alias__)) long_a;
+#else
+            typedef long long_a;
+#endif            
+            long const res=BOOST_INTERLOCKED_COMPARE_EXCHANGE(reinterpret_cast<long_a*>(target),
+                                                              *reinterpret_cast<long_a*>(&new_value),
+                                                              *reinterpret_cast<long_a*>(&comparand));
             return *reinterpret_cast<T const*>(&res);
         }