/* n_15.c:  #ifdef, #ifndef directives. */

#define MACRO_1     1

/* 15.1:    #ifdef directive.   */

/*  Valid block */

#ifdef  MACRO_1

    Valid block 1

#else

    Block to be skipped

#endif

/* 15.2:    #ifndef directive.  */

/*  Valid block */

#ifndef MACRO_1

    Block to be skipped

#else

    Valid block 2

#endif

/* { dg-do preprocess }

   { dg-final { if ![file exist n_15.i] { return }                      } }

   { dg-final { if \{ [grep n_15.i "Valid block 1"] != ""       \} \{   } }

   { dg-final { if \{ [grep n_15.i "Valid block 2"] != ""       \} \{   } }

   { dg-final { return \} \}                                            } }

   { dg-final { fail "n_15.c: #ifdef, #ifndef directives"               } }

 */