CMake/Tests/ObjectLibrary/mainAB.c

#if defined(_WIN32) && defined(SHARED_B)
# define IMPORT_B __declspec(dllimport)
#else
# define IMPORT_B
#endif
extern IMPORT_B int b1(void);
extern IMPORT_B int b2(void);
#ifndef NO_A
extern int a1(void);
extern int a2(void);
#endif
int main(void)
{
  return 0
#ifndef NO_A
    + a1()
    + a2()
#endif
    + b1()
    + b2()
    ;
}