gtkmm dll exports standard library template instantiations on windows
In vcpkg we found that gtkmm exports template functions from the standard library from it's DLLs. This is a problem because those exported functions don't have selectany behavior, and so are always used no matter what. This wouldn't be a problem except that multiple libraries do this, usually for similar reasons as gtkmm (they want the unix behavior of exporting everything by default from their shared libraries. Unfortunately when multiple libraries do this it makes them impossible to ever use together, as you'll get duplicate definition errors.