Index: boost/thread/detail/config.hpp
===================================================================
--- boost/thread/detail/config.hpp	(revision 59433)
+++ boost/thread/detail/config.hpp	(working copy)
@@ -53,6 +53,8 @@
 #   else
 #       define BOOST_THREAD_DECL
 #   endif
+#elif defined(BOOST_HAS_VISIBILITY)
+#   define BOOST_THREAD_DECL __attribute__ ((visibility("default")))
 #else
 #   define BOOST_THREAD_DECL
 #endif // BOOST_HAS_DECLSPEC
Index: boost/thread/exceptions.hpp
===================================================================
--- boost/thread/exceptions.hpp	(revision 59433)
+++ boost/thread/exceptions.hpp	(working copy)
@@ -24,10 +24,10 @@
 namespace boost
 {
 
-    class thread_interrupted
+    class BOOST_THREAD_DECL thread_interrupted
     {};
 
-    class thread_exception:
+    class BOOST_THREAD_DECL thread_exception:
         public std::exception
     {
     protected:
@@ -55,7 +55,7 @@
         int m_sys_err;
     };
 
-    class condition_error:
+    class BOOST_THREAD_DECL condition_error:
         public std::exception
     {
     public:
@@ -66,7 +66,7 @@
     };
     
 
-    class lock_error:
+    class BOOST_THREAD_DECL lock_error:
         public thread_exception
     {
     public:
@@ -87,7 +87,7 @@
         }
     };
 
-    class thread_resource_error:
+    class BOOST_THREAD_DECL thread_resource_error:
         public thread_exception
     {
     public:
@@ -109,7 +109,7 @@
     
     };
 
-    class unsupported_thread_option:
+    class BOOST_THREAD_DECL unsupported_thread_option:
         public thread_exception
     {
     public:
@@ -131,7 +131,7 @@
     
     };
 
-    class invalid_thread_argument:
+    class BOOST_THREAD_DECL invalid_thread_argument:
         public thread_exception
     {
     public:
@@ -153,7 +153,7 @@
     
     };
 
-    class thread_permission_error:
+    class BOOST_THREAD_DECL thread_permission_error:
         public thread_exception
     {
     public:
Index: boost/config/compiler/gcc.hpp
===================================================================
--- boost/config/compiler/gcc.hpp	(revision 59433)
+++ boost/config/compiler/gcc.hpp	(working copy)
@@ -94,7 +94,18 @@
 #if __GNUC__ > 3 || ( __GNUC__ == 3 && __GNUC_MINOR__ >= 1 )
 #define BOOST_HAS_NRVO
 #endif
+
 //
+// gcc visibility
+//
+#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+# define BOOST_HAS_VISIBILITY
+#endif 
+
+
+
+
+//
 // RTTI and typeinfo detection is possible post gcc-4.3:
 //
 #if __GNUC__ * 100 + __GNUC_MINOR__ >= 403