Revert "SmartPointer: Remove obsolete GCC version checks."

This reverts commit 0e6ddb843e.

include/boost/smart_ptr/detail/sp_convertible.hpp

@@ -21,6 +21,10 @@
 # define BOOST_SP_NO_SP_CONVERTIBLE
 #endif
 
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ < 303 )
+# define BOOST_SP_NO_SP_CONVERTIBLE
+#endif
+
 #if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) && defined( __BORLANDC__ ) && ( __BORLANDC__ < 0x630 )
 # define BOOST_SP_NO_SP_CONVERTIBLE
 #endif

include/boost/smart_ptr/intrusive_ptr.hpp

@@ -208,6 +208,17 @@ template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const
     return a != b.get();
 }
 
+#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
+
+// Resolve the ambiguity between our op!= and the one in rel_ops
+
+template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
+{
+    return a.get() != b.get();
+}
+
+#endif
+
 #if !defined( BOOST_NO_CXX11_NULLPTR )
 
 template<class T> inline bool operator==( intrusive_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
@@ -268,6 +279,16 @@ template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U
 
 #if !defined(BOOST_NO_IOSTREAM)
 
+#if ( defined(__GNUC__) &&  (__GNUC__ < 3) )
+
+template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
+{
+    os << p.get();
+    return os;
+}
+
+#else
+
 // in STLport's no-iostreams mode no iostream symbols can be used
 #ifndef _STLP_NO_IOSTREAMS
 
@@ -279,6 +300,8 @@ template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::
 
 #endif // _STLP_NO_IOSTREAMS
 
+#endif // __GNUC__ < 3
+
 #endif // !defined(BOOST_NO_IOSTREAM)
 
 // hash_value

include/boost/smart_ptr/shared_ptr.hpp

@@ -740,6 +740,17 @@ template<class T, class U> inline bool operator!=(shared_ptr<T> const & a, share
     return a.get() != b.get();
 }
 
+#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
+
+// Resolve the ambiguity between our op!= and the one in rel_ops
+
+template<class T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b) BOOST_NOEXCEPT
+{
+    return a.get() != b.get();
+}
+
+#endif
+
 #if !defined( BOOST_NO_CXX11_NULLPTR )
 
 template<class T> inline bool operator==( shared_ptr<T> const & p, boost::detail::sp_nullptr_t ) BOOST_NOEXCEPT
@@ -825,6 +836,16 @@ template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shar
 
 #if !defined(BOOST_NO_IOSTREAM)
 
+#if ( defined(__GNUC__) &&  (__GNUC__ < 3) )
+
+template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
+{
+    os << p.get();
+    return os;
+}
+
+#else
+
 // in STLport's no-iostreams mode no iostream symbols can be used
 #ifndef _STLP_NO_IOSTREAMS
 
@@ -836,6 +857,8 @@ template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::
 
 #endif // _STLP_NO_IOSTREAMS
 
+#endif // __GNUC__ < 3
+
 #endif // !defined(BOOST_NO_IOSTREAM)
 
 // get_deleter
@@ -843,10 +866,12 @@ template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::
 namespace detail
 {
 
-#if ( defined(__EDG_VERSION__) && BOOST_WORKAROUND(__EDG_VERSION__, <= 238) ) || \
+#if ( defined(__GNUC__) && BOOST_WORKAROUND(__GNUC__, < 3) ) || \
+    ( defined(__EDG_VERSION__) && BOOST_WORKAROUND(__EDG_VERSION__, <= 238) ) || \
     ( defined(__HP_aCC) && BOOST_WORKAROUND(__HP_aCC, <= 33500) )
 
-// EDG 2.38 and HP aCC A.03.35 don't allow static_cast<X const *>(void *)
+// g++ 2.9x doesn't allow static_cast<X const *>(void *)
+// apparently EDG 2.38 and HP aCC A.03.35 also don't accept it
 
 template<class D, class T> D * basic_get_deleter(shared_ptr<T> const & p)
 {