Can't access variable in C++ DLL from a C app

extern "C" _declspec(dllexport) char* MyNewVariable = 0;

_declspec(dllimport) char* MyNewVariable;

extern "C" _declspec(dllimport) char* MyNewVariable;

#ifdef __cplusplus
extern "C" {
#endif
declspec(dllimport) char MyNewVariable;
#ifdef __cplusplus
}
#endif

extern "C" _declspec(dllexport) char* MyNewVariable = 0;

extern "C" _declspec(dllimport) char* MyNewVariable;

#ifdef __cplusplus
extern "C" {
#endif
#ifdef dll_source_file
#define EXPORTED declspec(dllexport)
#else
#define EXPORTED declspec(dllimport)
#endif dll_source_file
#ifdef __cplusplus
}
#endif

EXPORTED char* MyNewVariable;

#define dll_source_code
#include "universal_header.h"

EXPORTED char* MyNewVariable = 0;

#include "universal_header.h"
...
MyNewVariable = "Hello, world";

#include "export_magic.h"

EXPORTED char *MyNewVariable;

extern "C" char* MyNewVariable;