101e04c3fSmrg#if defined(foo) 201e04c3fSmrgfailure_1 301e04c3fSmrg#else 401e04c3fSmrgsuccess_1 501e04c3fSmrg#endif 601e04c3fSmrg#define foo 701e04c3fSmrg#if defined ( foo ) 801e04c3fSmrgsuccess_2 901e04c3fSmrg#else 1001e04c3fSmrgfailure_2 1101e04c3fSmrg#endif 1201e04c3fSmrg#undef foo 1301e04c3fSmrg#if defined (foo) 1401e04c3fSmrgfailure_3 1501e04c3fSmrg#else 1601e04c3fSmrgsuccess_3 1701e04c3fSmrg#endif 18