#ifdef _WIN32
#define DLLEXPORT __declspec( dllexport )
#else
#define DLLEXPORT
#endif

typedef int (*multiply_by_two_func)( int );

DLLEXPORT int multiply_by_two( int a );

int multiply_by_two( int a ) {
	return a * 2;
}

extern int DLLEXPORT seven;

int seven = 7;

typedef struct {
	int major;
	int minor;
	multiply_by_two_func func;
} module_descriptor_t;

extern DLLEXPORT module_descriptor_t mod_descr;

module_descriptor_t mod_descr = {
	1, 0, &multiply_by_two
};