'variable' : 'thread' data may not have dll interface
The variable is declared with the thread attribute and with DLL interface. The address of the thread variable is not known until run time, so it cannot be linked to a DLL import or export. The following sample generates C2492:
class C { public: char ch; }; __declspec(dllexport) __declspec(thread) C c_1; // C2492 // try ... // __declspec(thread) C c_1; void main() { }