gcc/testsuite/gcc.dg/c11-noreturn-2.c

   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 }