Re: [Boost.Serialization] Exception during serialization through base pointer DLL & EXE

From: Marc Viala (cram.viala_at_[hidden])
Date: 2022-03-07 07:35:48

Thank you very much for your reply Gavin.  This is what we had assumed
after all our tests and we have now the confirmation.

I am just wondering if it will be valuable to explain this corner case in
the Boost.Serialization documentation.

Best regards,

Marc

Le lun. 7 mars 2022 Ã  01:34, Gavin Lambert via Boost-users <
boost-users_at_[hidden]> a écrit :

> On 6/03/2022 00:21, Marc Viala wrote:
> > On our platform (VS2019, Windows x64, Boost 1.77) an exception occurs
> > during the serialization of an instance through its base pointer. This
> > error is systematic and I was able to reproduce w/ a minimal use test
> > (cf. enclosed archive). This use case includes a solution w/ a DLL
> > project and EXE project. The EXE project is a simple unit-test. On my
> > platform  when I execute the executable, I trigger an exception from
> > Boost.Serialization ("unregistered void cast class cpe::derived_t<-class
> > cpe::object_t"). I tried every recommandation that we can find on SO and
> > Boost mailing lists without success. To be accurate, I prefer to mention
> > that we are using Boost.Serialization Static Library flavor.
>
> This last sentence is the cause of your problem.
>
> If you wish to use static libraries, then you must use *only* static
> libraries (or at least anything that is in a static library cannot
> appear in your DLL ABI at all).
>
> If you wish to use Boost.Serialization in your DLL ABI then you must use
> the shared library variant only, such that both your EXE and DLL use a
> common implementation.  Otherwise they will each have independent copies
> of the singletons.
>
> If your DLL boundary exists only for unit testing, then switch your DLL
> to a static library instead.  If it exists for consuming by applications
> other than just your unit test, then you have to ensure that Boost types
> and concepts do not cross the DLL boundary if you want to use them as a
> static library.
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>

-- 
Marc Viala