CMake/Tests/ObjectLibrary/main.c

#if defined(_WIN32) && defined(SHARED_C)
# define IMPORT_C __declspec(dllimport)
#else
# define IMPORT_C
#endif
extern IMPORT_C int b1(void);
extern IMPORT_C int b2(void);
extern IMPORT_C int c(void);
int main(void)
{
  return 0
    + c()
    + b1()
    + b2()
    ;
}