Boost Users :
Subject: Re: [Boost-users] BOOST_ALL_DYN_LINK
From: Vladimir Prus (ghost_at_[hidden])
Date: 2010-03-08 11:43:07
> > Then, if I define BOOST_ALL_DYN_LINK, I get lots of these messages:
> > boost_1_42_0\boost/signals/detail/signal_base.hpp(113) : warning
> > 'boost::signals::detail::signal_base_impl::combiner_' : class
> > needs to have dll-interface to be used by clients of class
> > 'boost::signals::detail::signal_base_impl'
> > 39> boost_1_42_0\boost/any.hpp(36) : see declaration of
> > I've read up on this and understand why the warnings are shown.
> > BUT,
> > I don't understand why I am able to still link my program if I do
> NOT define
> > BOOST_ALL_DYN_LINK.
> > Without the flag, it compiles without warnings, it links without
> > AND the executable requires the signals DLL to be available, so
> clearly it
> > IS dynamically linked. Right?
> Do you include import library for Boost.Signals in the link? Then,
> compiler automatically 'dllimports' the symbol. Please see:
> Does this help?
> - Volodya
> This DOES help a lot !
> So, I have a few options:
> 1) Define BOOST_ALL_DYN_LINK and put up with the excess warnings.
> This would be ok if the boost developers could "fix" their headers by
> adding #pragmas to hide the warnings when they know its not a problem.
> 2) Define BOOST_ALL_DYN_LINK and write a couple of header files that
> wrap the boost headers with #pragmas (eg especially for boost::signals)
> 3) Do not define BOOST_ALL_DYN_LINK, and allow Windows the link "the
> naive way", which might give slower performance, but maybe not.
It would certainly help if somebody with practical experience with Windows
comment here (which I am not). For all I understand, that warning is false
positive, given that boost::any is all templated code, and probably the
best solution is to disable it in your project settings -- and, maybe,
when building boost itself? Comments?
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