On 8/24/05, Vladimir Prus <ghost@cs.msu.su> wrote:
Luke Elliott wrote:
(BTW - I just used program_options as an example as that's what I was looking at at the time...)
I don't have access to VC++ right now so this is from memory, but there are (at least) 2 cases where it raises a warning:
class MY_LIB_DECL my_class : public some_base { my_class(); };
if some_base isn't a declspeced class then you get "warning non dll-interface class used as based for dll-interface class".
I believe this sometime happen when inheriting boost::noncopyable, that has no method to begin with, right? Then it's indeed poor compiler diagnostic, and we probably can add declspec, but I don't yet understand when it should be dllexport and when dllimport :-/
It's dependent on the users context. The easiest solution would be to have some macro (BOOST_CLASS_LINKAGE or something?) normally declared as empty: #define BOOST_CLASS_LINKAGE class BOOST_CLASS_LINKAGE noncopyable { <definition> }; If you need to dllexport a Boost class, redefine BOOST_CLASS_LINKAGE appropriately: #undef BOOST_CLASS_LINKAGE #define BOOST_CLASS_LINKAGE __declspec(dllexport) Having said that, my normal approach is #pragma warning(disable : 4275)... <snip>
- Volodya
Stuart Dootson