[Boost-users] [signals] Compiler warnings with BOOST_ALL_DYN_LINK

24 Mar 2005

      Hello,

I have a problem using Boost.Signals. With this test program:

<code>
 // See the previous thread regarding
// "[regex] Unresolved external symbols under VC7.1 w/ dynamic linking
#define BOOST_ALL_DYN_LINK
#include <boost/signals.hpp>

int main(int argc, char* argv[])
{
    return 0;
}
</code>

I get some compiler warnings under MSVC 7.1 / Boost 1.32. Is there something I
can do about it?

Here is the compiler output I get:

c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\connection.hpp(111) :
warning C4251: 'boost::signals::connection::con' : class 'boost::shared_ptr<T>'
needs to have dll-interface to be used by clients of class
'boost::signals::connection'
        with
        [
            T=boost::signals::detail::basic_connection
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\trackable.hpp(55) :
warning C4251: 'boost::signals::trackable::connected_signals' : class
'std::list<_Ty>' needs to have dll-interface to be used by clients of class
'boost::signals::trackable'
        with
        [
            _Ty=boost::signals::connection
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\slot.hpp(51) : warning
C4251: 'boost::signals::detail::slot_base::data' : class 'boost::shared_ptr<T>'
needs to have dll-interface to be used by clients of class
'boost::signals::detail::slot_base'
        with
        [
            T=boost::signals::detail::slot_base::data_t
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\named_slot_map.hpp(100)
: warning C4251: 'boost::signals::detail::named_slot_map_iterator::impl_' :
class 'boost::scoped_ptr<T>' needs to have dll-interface to be used by clients
of class 'boost::signals::detail::named_slot_map_iterator'
        with
        [
            T=boost::signals::detail::named_slot_map_iterator::impl
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\named_slot_map.hpp(129)
: warning C4251: 'boost::signals::detail::named_slot_map::impl_' : class
'boost::scoped_ptr<T>' needs to have dll-interface to be used by clients of
class 'boost::signals::detail::named_slot_map'
        with
        [
            T=boost::signals::detail::named_slot_map::impl
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\signal_base.hpp(40)
: warning C4251: 'boost::signals::detail::call_notification::impl' : class
'boost::shared_ptr<T>' needs to have dll-interface to be used by clients of
class 'boost::signals::detail::call_notification'
        with
        [
            T=boost::signals::detail::signal_base_impl
        ]
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\signal_base.hpp(114)
: warning C4251: 'boost::signals::detail::signal_base_impl::combiner_' : class
'boost::any' needs to have dll-interface to be used by clients of class
'boost::signals::detail::signal_base_impl'
        c:\dev\Libraries\Boost\include\boost-1_32\boost\any.hpp(22) : see
declaration of 'boost::any'
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\signal_base.hpp(120)
: warning C4275: non dll-interface class 'boost::noncopyable_::noncopyable' used
as base for dll-interface class 'boost::signals::detail::signal_base'
        c:\dev\Libraries\Boost\include\boost-1_32\boost\noncopyable.hpp(22) :
see declaration of 'boost::noncopyable_::noncopyable'

c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\signal_base.hpp(120)
: see declaration of 'boost::signals::detail::signal_base'
c:\dev\Libraries\Boost\include\boost-1_32\boost\signals\detail\signal_base.hpp(150)
: warning C4251: 'boost::signals::detail::signal_base::impl' : class
'boost::shared_ptr<T>' needs to have dll-interface to be used by clients of
class 'boost::signals::detail::signal_base'
        with
        [
            T=boost::signals::detail::signal_base_impl
        ]

Best,

Klaus

--
Klaus Nowikow
DECOMSYS - Dependable Computer Systems
Development Engineer
Stumpergasse 48/14, A-1060 Wien, Austria
Phone: +43 1 59983-31
Fax: +43 1 59983-731
http://www.decomsys.com