visual studio 2012 can't resolve static fields in a dll lib -

i'm compiling openexr2.0.0 using visual studio 2012 x64 dll, got error:

imflut.obj : error lnk2001: unresolved external symbol "private: static union half::uif const * const half::_tofloat" (?_tofloat@half@@0qbtuif@1@b)  imfrgbayca.obj : error lnk2001: unresolved external symbol "private: static unsigned short const * const half::_elut" (?_elut@half@@0qbgb) 

and looked in half.lib using dumpbin /exports:

another using dumpbin /exports on half.dll:

the 2 symbols there. , interestingly, when remove half.lib dependency, vs complain convert unresolved. shows find convert not _tofloat , _elut. differences are: _tofloat , _elut both static fields, convert static method.

    class half     {         ...       public:          union uif         {         unsigned int    i;         float       f;         };        private:          half_export static short                  convert (int i);          half_export static const uif              _tofloat[1 << 16];         half_export static const unsigned short   _elut[1 << 9];         ...     }; 

my system windows 8 x64. know how fix problem?

you're trying link against __declspec(dllexport)-ed symbols. means need make sure you're __declspec(dllimport)-ing symbols in project file. half - there's #define can add: openexr_dll being checked appearance in halfexport.h , you.