Re: [boost] Wrong class export/visibility setting for shared libs in many Boost libs

Niall Douglas wrote:

So, as I already said, don't do that. Only symbols whose typeinfos need to be seen during RTTI lookup should always be BOOST_SYMBOL_VISIBLE. That is generally types thrown as exceptions, and anything else subject to dynamic_cast.

One problem here is that the library doesn't know which of its types are subject to dynamic_cast in user code.