From: "Ben Hutchings" <ben.hutchings@businesswebsoftware.com> Reply-To: boost-users@lists.boost.org To: <boost-users@lists.boost.org> Subject: RE: [Boost-users] boost::thread, boost::bind, and member functions Date: Tue, 25 May 2004 17:32:10 +0100

Mike Feldmeier <pooky_bunny@hotmail.com> wrote: [ Ben Hutchings wrote:]

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Mike Feldmeier <pooky_bunny@hotmail.com> wrote: <snip>

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This consistently produces the linking error:

converter.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall boost::thread::thread( class boost::function0<void,class _STL::allocator<class boost::function_base> > const &)" (__imp_??0thread@boost@@QAE@ABV?$function0@XV?$allocator@Vfunction _base@boost@@@_STL@@@1@@Z) referenced in function "public: void __thiscall mytest::test::converter::run(void)" (?run@converter@test@mytest@@QAEXXZ)

I think you aren't linking with the thread library. <snip> I'm using Visual C++ 7.1, but using straight C++, no .NET. I've defined the addtional library path (C:\boost\lib) and tried linking (in the additional dependencies) with boost_thread-vc71-mt-gdp-1_31.lib, boost_thread-vc71-mt-gdp.lib, boost_thread-vc71-mt-p-1_31.lib, and boost_thread-vc71-mt-p.lib (one at a time, of course), but I get the same error message with all of them. <snip>

I've worked it out now. In your main program you are using STLport - notice the "_STL" namespace instead of "std" but Boost.Thread is built with the library that comes with VC++ 7.1, which of course uses the "std" namespace. Unless STLport has some specific feature that you need I suggest you use the standard library that comes with VC++ 7.1; it's a very good implementation. If you must use STLport then you need to build Boost.Thread (and any other libraries with which you share standard library types) using it.

Unfortunately, this whole roadtrip started with the need for STL collections to cross DLL boundaries, which is why I am using STLPort. The STL that comes with VC++ 7.1 doesn't (with the exception of string and vector). When I built boost, I built it with the vc7.1-stlport toolset, and I have the stlport library directory in my "additional library path". Along this line, I wonder if I need to be doing something special with the STLPort DLL?

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