From e40ae62ced08cd330219c17722447e971eeda17a Mon Sep 17 00:00:00 2001
From: Robert Ramey <ramey@rrsd.com>
Date: Mon, 21 Mar 2016 00:02:06 -0700
Subject: [PATCH] tweak visitoiity to eliminate linker warnings

---
 include/boost/archive/binary_iarchive_impl.hpp   | 2 +-
 include/boost/archive/binary_oarchive_impl.hpp   | 2 +-
 include/boost/archive/detail/common_iarchive.hpp | 2 +-
 include/boost/archive/detail/common_oarchive.hpp | 3 ++-
 4 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/boost/archive/binary_iarchive_impl.hpp b/include/boost/archive/binary_iarchive_impl.hpp
index d6b217b4..b4747c98 100644
--- a/include/boost/archive/binary_iarchive_impl.hpp
+++ b/include/boost/archive/binary_iarchive_impl.hpp
@@ -33,7 +33,7 @@ namespace detail {
 } // namespace detail
 
 template<class Archive, class Elem, class Tr>
-class binary_iarchive_impl : 
+class BOOST_SYMBOL_VISIBLE binary_iarchive_impl : 
     public basic_binary_iprimitive<Archive, Elem, Tr>,
     public basic_binary_iarchive<Archive>
 {
diff --git a/include/boost/archive/binary_oarchive_impl.hpp b/include/boost/archive/binary_oarchive_impl.hpp
index 11793271..6b4d018a 100644
--- a/include/boost/archive/binary_oarchive_impl.hpp
+++ b/include/boost/archive/binary_oarchive_impl.hpp
@@ -34,7 +34,7 @@ namespace detail {
 } // namespace detail
 
 template<class Archive, class Elem, class Tr>
-class binary_oarchive_impl : 
+class BOOST_SYMBOL_VISIBLE binary_oarchive_impl : 
     public basic_binary_oprimitive<Archive, Elem, Tr>,
     public basic_binary_oarchive<Archive>
 {
diff --git a/include/boost/archive/detail/common_iarchive.hpp b/include/boost/archive/detail/common_iarchive.hpp
index b4c44d27..82304f1e 100644
--- a/include/boost/archive/detail/common_iarchive.hpp
+++ b/include/boost/archive/detail/common_iarchive.hpp
@@ -35,7 +35,7 @@ class extended_type_info;
 
 // note: referred to as Curiously Recurring Template Patter (CRTP)
 template<class Archive>
-class common_iarchive : 
+class BOOST_SYMBOL_VISIBLE common_iarchive : 
     public basic_iarchive,
     public interface_iarchive<Archive>
 {
diff --git a/include/boost/archive/detail/common_oarchive.hpp b/include/boost/archive/detail/common_oarchive.hpp
index 13c71bc5..ee42bbe5 100644
--- a/include/boost/archive/detail/common_oarchive.hpp
+++ b/include/boost/archive/detail/common_oarchive.hpp
@@ -32,7 +32,8 @@ namespace detail {
 
 // note: referred to as Curiously Recurring Template Patter (CRTP)
 template<class Archive>
-class common_oarchive : 
+
+class BOOST_SYMBOL_VISIBLE common_oarchive :
     public basic_oarchive,
     public interface_oarchive<Archive>
 {