Hi! I had the same problem. This seems to be an MS bug. In our case using VC++ 7.1 we compiled an application with 4 byte struct member alignment and were unable to link it. Using the dependency walker has shown, that this symbol is differently exported in program_options.dll as expected from the linker which links to the DLL. I remember that I have written what we did to resolve the problem. Here is my previous post: http://groups.google.am/group/boost-list/browse_frm/thread/3ec1940f2517241f/... We had the similar issue with boost::filesystem and 4 byte alignment as well. With Kind Regards, Ovanes On Wed, Sep 17, 2008 at 5:29 PM, Sebastian Hauer <sebastian.hauer@gmail.com>wrote:
[...] error LNK2001: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > boost::program_options::arg" (?arg@program_options@boost@@3V?$basic_string@DU?$char_traits@D@std@ @V?$allocator@D@2@@std@@A) [...]