Just discovered that registering type via EXPORT doesn't work with polymorphic archives !!!

Corrected this.

src/polymorphic_binary_oarchive.cpp

@@ -0,0 +1,30 @@
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// polymorphic_binary_oarchive.cpp:
+
+// (C) Copyright 2018 Robert Ramey - http://www.rrsd.com .
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+#if (defined _MSC_VER) && (_MSC_VER == 1200)
+#  pragma warning (disable : 4786) // too long name, harmless warning
+#endif
+
+#define BOOST_ARCHIVE_SOURCE
+#include <boost/serialization/config.hpp>
+#include <boost/archive/polymorphic_binary_oarchive.hpp>
+
+// explicitly instantiate for this type of text stream
+#include <boost/archive/impl/archive_serializer_map.ipp>
+
+namespace boost {
+namespace archive {
+namespace detail {
+
+template class detail::archive_serializer_map<polymorphic_binary_oarchive>;
+
+} // detail
+} // archive
+} // boost