Re: [Boost-users] undefined reference to base_object

Subject: Re: [Boost-users] undefined reference to base_object
From: Robert Ramey (ramey_at_[hidden])
Date: 2010-05-02 12:16:34

John C wrote:
> I am working with the boost 1.40.0 serialization library and I am
> having trouble with class registration for polymorphic types. The
> code I have has worked fine with VS2005 and VS2008 for a long time;
> however, in linux with gcc (4.4.1-4ubuntu9), I am having issues.
>
> I am using the non-intrusive serialization method on a class that
> resides in a shared object file. I have simplified this down to where
> the serialization of the object is performed in an executable linking
> in the shared object file. In Windows I am registering the classes
> with boost using BOOST_CLASS_EXPORT_GUID. However, in linux, if I
> register the classes using this macro, the code compiles but does not
> link and gives an error similar to below for :
>
>
> testConfig.o: In function
> `boost::archive::detail::iserializer<boost::archive::text_iarchive,
> MyNamespace::MyDerivedClass>::load_object_data(boost::archive::detail::basic_iarchive&,
> void*, unsigned int) const':
> testConfig.cpp:(.text._ZNK5boost7archive6detail11iserializerINS0_13text_iarchiveEN7MoreOfMyClassRelatredDataEE16load_object_dataERNS1_14basic_iarchiveEPvj[boost::archive::detail::iserializer<boost::archive::text_iarchive,
> MyNamespace::MyDerivedClass>::load_object_data(boost::archive::detail::basic_iarchive&,
> void*, unsigned int) const]+0x96): undefined reference to
> `MyNamespace::MyBaseClass&
> boost::serialization::base_object<MyNamespace::MyBaseClass,
> MyNamespace::MyDerivedClass>(MyNamespace::MyDerivedClass const&)'
>
> The same error also occurs with save_object_data.

without seeing more, the only thing that occurs to me is to check that
your non-instrusive save/load functions are in the correct namespace.

Robert Ramey

>
>
> If I don't register, my test fails with the unregistered class
> exception. I have tried placing the macros in both a header and a
> source file and I still get the linker errors following advice from
> here:
> http://www.boost.org/doc/libs/1_40_0/libs/serialization/doc/special.html#export.
> I also tried explicitly instantiating the base_object methods, but
> get an error indicating no matching definition exists, so I am
> assuming this is related to the issue - I'm just not sure how else to
> define the function. I am familiar with basic templating, but the
> serialization library source is beyond me.
>
> Any help would be greatly appreciated.....
>
> Thanks - John