Re: [Boost-users] [serialization] Multiply defined symbol:guid_initializer

Subject: Re: [Boost-users] [serialization] Multiply defined symbol:guid_initializer
From: Robert Dailey (rcdailey_at_[hidden])
Date: 2009-04-03 12:26:18

What?? I see you have a force_serialize_export() function, but how can you
guys expect me to mangle my interfaces to get boost::serialization to do its
job? So I have to now call arbitrary global functions all over the place?
This is unreasonable and unacceptable. There has to be a better way!

On Fri, Apr 3, 2009 at 11:05 AM, Renaud Lepere <Renaud.Lepere_at_[hidden]>wrote:

> Hello,
>
> I had a similar problem, you must call a function in the compilation
> unit if you put only the macros in the .cpp if will not work.
>
> BOOST_CLASS_EXPORT(Curve2);
> BOOST_CLASS_EXPORT(Line2);
> BOOST_CLASS_EXPORT(Circle2);
>
> /**
>  * DO NOT REMOVE THIS FUNCTION
>  * The C++ standard guarantees that all global objects contained
>  * in a compilation unit (a CPP file) are initialized by the time
>  * execution enters a function from that compilation unit. So, if
>  * execution never enters a function from that compilation unit,
>  * the compiler is allowed to deadstrip it.
>  *
>  * BOOST_CLASS_EXPORT is based upon global objects.
>  */
> void force_serialize_export();
>
>
>
> ________________________________
>
>        De : boost-users-bounces_at_[hidden] [mailto:
> boost-users-bounces_at_[hidden]] De la part de Robert Dailey
>        Envoyé : vendredi 3 avril 2009 16:56
>        À : boost-users_at_[hidden]
>        Objet : Re: [Boost-users] [serialization] Multiply defined
> symbol:guid_initializer
>
>
>        But I've already tried that, as I said. It fails at runtime with an
> exception saying "unregistered void cast". I'll test it once more, but I
> don't expect different results.
>
>
>        On Thu, Apr 2, 2009 at 10:07 PM, Robert Ramey <ramey_at_[hidden]>
> wrote:
>
>
>                Look at the pimple demo in the examples or test directory.
>  Basically you're getting some things defined twiice.
>
>                Move the implementation of template< class Archive >
>                        void serialize( Archive& archive, unsigned int
> version ) to the *.cpp
>                and move
>                BOOST_CLASS_EXPORT( rs::StaticText )
>
>                to the *.cpp file as well.  compile that/those *.cpp files
> and include in the library. This is touched upon in the manual in the part
> describing EXPORT.
>
>                Robert Ramey
>
>                        "Robert Dailey" <rcdailey_at_[hidden]> wrote in
> message news:496954360904021720o79c9c17cs18b1cf3f53da08c_at_mail.gmail.com...
>                        Hi,
>
>                        I'm currently trying to polymorphically serialize a
> class without using RTTI. I'm doing this currently in a file called
> StaticText.hpp:
>
>                        #ifndef RS_GUI_WIDGETS_STATICTEXT_HPP
>                        #define RS_GUI_WIDGETS_STATICTEXT_HPP
>
>
>                        #include <boost/scoped_ptr.hpp>
>                        #include <boost/serialization/access.hpp>
>                        #include <boost/serialization/base_object.hpp>
>                        #include <boost/serialization/string.hpp>
>                        #include
> <boost/serialization/extended_type_info_no_rtti.hpp>
>                        #include <boost/serialization/export.hpp>
>
>
>                        #include <rs/gui/widgets/Widget.hpp>
>                        #include <rs/gui/Text.hpp>
>
>
>
>
>                        namespace rs
>                        {
>                            class StaticText : public Widget
>                            {
>                            public:
>                                StaticText( std::string const& text );
>
>
>                                void Update();
>                                void Render( RenderSystem& renderer, Camera&
> camera );
>                                char const* get_key() const;
>
>
>                            private:
>                                StaticText() {}
>
>
>                                template< class Archive >
>                                void serialize( Archive& archive, unsigned
> int version )
>                                {
>                                    archive &
> boost::serialization::base_object<Widget>( *this );
>
>
>                                    std::string text;
>                                    archive & text;
>                                    m_text.reset( new Text( text ) );
>                                }
>
>
>                                boost::scoped_ptr<Text> m_text;
>
>
>                                friend class boost::serialization::access;
>                            };
>                        }
>
>
>                        BOOST_CLASS_TYPE_INFO(
>                            rs::StaticText,
>                            extended_type_info_no_rtti<rs::StaticText>
>                            )
>
>
>                        BOOST_CLASS_EXPORT( rs::StaticText )
>
>
>                        #endif // RS_GUI_WIDGETS_STATICTEXT_HPP
>
>                        When I compile this into a LIB first, and then link
> the lib into an EXE, the linker says this (Visual Studio 2008):
>                        gui.lib(StaticText.obj) : error LNK2005: "public:
> static struct boost::archive::detail::guid_initializer<class rs::StaticText>
> const & const boost::archive::detail::init_guid<class
> rs::StaticText>::guid_initializer" (?guid_initializer@
> ?$init_guid_at_VStaticText@rs@@@detail_at_archive@boost@
> @2ABU?$guid_initializer_at_VStaticText@rs@@@234_at_B) already defined in
> main.obj
>
>
>                        If I move the 2 macro calls into the StaticText.cpp
> file, everything compiles/links just fine but I end up getting an exception
> thrown at runtime that says "unregistered void cast".
>
>                        ________________________________
>
>
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