Re: [Boost-bugs] [Boost C++ Libraries] #6688: better support for exporting symbols from DLL

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #6688: better support for exporting symbols from DLL
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-03-18 23:16:00

#6688: better support for exporting symbols from DLL
--------------------------------------+-------------------------------------
  Reporter:  arvid@…                  |       Owner:  chris_kohlhoff
      Type:  Feature Requests         |      Status:  new           
 Milestone:  To Be Determined         |   Component:  asio          
   Version:  Boost Development Trunk  |    Severity:  Problem       
Resolution:                           |    Keywords:  export symbol 
--------------------------------------+-------------------------------------

Comment (by arvid@…):

 actually. with some more testing on darwin, it turns out there's one more
 change for this to work with GCC. the io_service::service type is not
 exported, only some of its member functions. My understanding of MSVC's
 export semantics is that all type metadata (specifically type_info and
 vtables) are always exported, whereas on GCC, you have to explicitly
 export a type for its metadata to be exported. I think the
 io_service::service type should be exported for this reason (otherwise I
 get a link error failing to find its type_info, presumably originating
 from a typeid() call inside an asio header).

 I'm attaching an updated patch.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6688#comment:1>
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