1  /* Test C11 _Noreturn.  Test valid code using stdnoreturn.h.  */
       2  /* { dg-do run } */
       3  /* { dg-options "-std=c11 -pedantic-errors" } */
       4  
       5  #include <stdnoreturn.h>
       6  
       7  extern int strcmp (const char *, const char *);
       8  
       9  noreturn void exit (int);
      10  noreturn void abort (void);
      11  
      12  noreturn int f1 (void);
      13  
      14  noreturn void f2 (void);
      15  
      16  static void noreturn f3 (void) { exit (0); }
      17  
      18  /* Returning from a noreturn function is undefined at runtime, not a
      19     constraint violation, but recommended practice is to diagnose if
      20     such a return appears possible.  */
      21  
      22  noreturn int
      23  f4 (void)
      24  {
      25    return 1; /* { dg-warning "has a 'return' statement" } */
      26    /* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
      27  }
      28  
      29  noreturn void
      30  f5 (void)
      31  {
      32    return; /* { dg-warning "has a 'return' statement" } */
      33    /* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
      34  }
      35  
      36  noreturn void
      37  f6 (void)
      38  {
      39  } /* { dg-warning "does return" } */
      40  
      41  noreturn void
      42  f7 (int a)
      43  {
      44    if (a)
      45      exit (0);
      46  } /* { dg-warning "does return" } */
      47  
      48  /* Declarations need not all have noreturn.  */
      49  
      50  void f2 (void);
      51  
      52  void f8 (void);
      53  noreturn void f8 (void);
      54  
      55  /* Duplicate noreturn is OK.  */
      56  noreturn noreturn void noreturn f9 (void);
      57  
      58  /* noreturn does not affect type compatibility.  */
      59  
      60  void (*fp) (void) = f5;
      61  
      62  #ifndef noreturn
      63  #error "noreturn not defined"
      64  #endif
      65  
      66  #define str(x) #x
      67  #define xstr(x) str(x)
      68  
      69  const char *s = xstr(noreturn);
      70  
      71  int
      72  main (void)
      73  {
      74    if (strcmp (s, "_Noreturn") != 0)
      75      abort ();
      76    exit (0);
      77  }