'operater new': redefinition, different linkage (using _dllspec on redefined new operator)

Question

I am using __declspec(dllimport/export) on a debug version of new as such:

#ifdef _DEBUG
 DECLSPECCORE extern   void* operator new(unsigned int size, const char* file, int line);
 extern void* operator new[](unsigned int size, const char* file, int line);
 extern void operator delete(void* address, const char* file, int line);
 extern void operator delete[](void* address, const char* file, int line);
 extern void Delete(void* address);

#define LUDO_NEW new(__FILE__, __LINE__)
#define LUDO_DELETE delete

#endif

This is causing me to get

error C2375: 'operator new': redefinition; different linkage.

Why is this and how can you fix it? This is the only project that I am compiling right now.

Answer 1

The C++ runtime itself provides an operator new, which is not marked as DECLSPECCORE -- hence "different linkage", the original was not imported from another module. If you intend to override operator new, it should have the same linkage as before.

Answer 2

Your code is saying that you want C++'s "operator new" to be exported as a function callable from outside the DLL. Assuming that's even possible (probably not): Are you sure that's what you want to do?

Answer 3

If you have two two prototypes of overloading the new operator you must export both. Hopefulyl that is your problem.