diff --git a/include/boost/exception/detail/attribute_noreturn.hpp b/include/boost/exception/detail/attribute_noreturn.hpp
index f6a0b59..ae9f031 100644
--- a/include/boost/exception/detail/attribute_noreturn.hpp
+++ b/include/boost/exception/detail/attribute_noreturn.hpp
@@ -9,7 +9,7 @@
 #if defined(_MSC_VER)
 #define BOOST_ATTRIBUTE_NORETURN __declspec(noreturn)
 #elif defined(__GNUC__)
-#define BOOST_ATTRIBUTE_NORETURN __attribute__((noreturn))
+#define BOOST_ATTRIBUTE_NORETURN __attribute__((__noreturn__))
 #else
 #define BOOST_ATTRIBUTE_NORETURN
 #endif
diff --git a/include/boost/exception/exception.hpp b/include/boost/exception/exception.hpp
index 9cdfd5c..42d2787 100644
--- a/include/boost/exception/exception.hpp
+++ b/include/boost/exception/exception.hpp
@@ -310,6 +310,11 @@ boost
     namespace
     exception_detail
         {
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility push (default)
+# endif
+#endif
         template <class T>
         struct
         error_info_injector:
@@ -326,6 +331,11 @@ boost
                 {
                 }
             };
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility pop
+# endif
+#endif
 
         struct large_size { char c[256]; };
         large_size dispatch_boost_exception( exception const * );
@@ -373,6 +383,11 @@ boost
     namespace
     exception_detail
         {
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility push (default)
+# endif
+#endif
         class
         clone_base
             {
@@ -386,6 +401,11 @@ boost
                 {
                 }
             };
+#if defined(__GNUC__)
+# if (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ > 4)
+#  pragma GCC visibility pop
+# endif
+#endif
 
         inline
         void
@@ -410,8 +430,15 @@ boost
         class
         clone_impl:
             public T,
-            public clone_base
+            public virtual clone_base
             {
+            struct clone_tag { };
+            clone_impl( clone_impl const & x, clone_tag ):
+                T(x)
+                {
+                copy_boost_exception(this,&x);
+                }
+
             public:
 
             explicit
@@ -430,7 +457,7 @@ boost
             clone_base const *
             clone() const
                 {
-                return new clone_impl(*this);
+                return new clone_impl(*this,clone_tag());
                 }
 
             void