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Subject: Re: [Boost-users] [Serialization] Linker error on BOOST_CLASS_EXPORTupgrading from 1.44.0
From: Enrico Carrara (enrico.ecamail_at_[hidden])
Date: 2011-07-29 11:02:46

On Mon, Jul 25, 2011 at 6:30 PM, Robert Ramey <ramey_at_[hidden]> wrote:

> Look at the most recent documentation. BOOST_CLASS_EXPORT is now replaced
> with two different macros (BOOST_CLASS_EXPORT_DECLARE and DEFINE or
> something like that) This permits one to arrange his code so that
> multiple definitions are avoided.

Thank you very much for your answer.

I tried using the two new macros (BOOST_CLASS_EXPORT_KEY and
BOOST_CLASS_EXPORT_IMPLEMENT). I replaced all the previous
BOOST_CLASS_EXPORT in SerClassExport.h with the corresponding _KEY, and this
solved the linker problem. So far, so good.
Then, in order to provided explicit code instantiation, I created a new
translation unit, "SerClassExport.cpp", as follows:

// SerClassExport.cpp
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>

#include "Model_Root.h"
#include "SM/SM_Node.h"
[...Many other class definition headers includes]
#include <boost/serialization/export.hpp>
[...Many other class export definitions]

I did it this way because, as far as I understand, I must include all the
archives before the _IMPLEMENT macros.
Now, when compiling SerClassExport.cpp, the compiler again goes out of heap
space, as it did before splitting the original unique .cpp into two
translation units - one for each archive type.

Am I doing it right? It seems that I did not catch how to have two separate
translation units without redefinition of guid_initializer::g.

Of course, if I remove the "extra_detail" namespace in export.hpp (coming
back to an unnamed namespace as it was in 1.44.0), everything goes ok, but I
can hardly think that this might be a feasible solution.

Any idea on possible alternatives?
Thank you in advance,

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