Avoid forceinline in old compilers due to bugs

include/boost/intrusive/detail/workaround.hpp

@@ -43,6 +43,9 @@
 #elif defined(BOOST_MSVC) && defined(_DEBUG)
    //"__forceinline" and MSVC seems to have some bugs in debug mode
    #define BOOST_INTRUSIVE_FORCEINLINE inline
+#elif defined(__GNUC__) && ((__GNUC__ < 4) || (__GNUC__ == 4 && (__GNUC_MINOR__ < 5)))
+   //Older GCCs have problems with forceinline
+   #define BOOST_INTRUSIVE_FORCEINLINE inline
 #else
    #define BOOST_INTRUSIVE_FORCEINLINE BOOST_FORCEINLINE
 #endif