gcc/testsuite/gcc.dg/c11-noreturn-1.c

   1 /* Test C11 _Noreturn.  Test valid code.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c11 -pedantic-errors" } */
   4
   5 _Noreturn void exit (int);
   6
   7 _Noreturn int f1 (void);
   8
   9 _Noreturn void f2 (void);
  10
  11 static void _Noreturn f3 (void) { exit (0); }
  12
  13 /* Returning from a noreturn function is undefined at runtime, not a
  14    constraint violation, but recommended practice is to diagnose if
  15    such a return appears possible.  */
  16
  17 _Noreturn int
  18 f4 (void)
  19 {
  20   return 1; /* { dg-warning "has a 'return' statement" } */
  21   /* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
  22 }
  23
  24 _Noreturn void
  25 f5 (void)
  26 {
  27   return; /* { dg-warning "has a 'return' statement" } */
  28   /* { dg-warning "does return" "second warning" { target *-*-* } .-1 } */
  29 }
  30
  31 _Noreturn void
  32 f6 (void)
  33 {
  34 } /* { dg-warning "does return" } */
  35
  36 _Noreturn void
  37 f7 (int a)
  38 {
  39   if (a)
  40     exit (0);
  41 } /* { dg-warning "does return" } */
  42
  43 /* Declarations need not all have _Noreturn.  */
  44
  45 void f2 (void);
  46
  47 void f8 (void);
  48 _Noreturn void f8 (void);
  49
  50 /* Duplicate _Noreturn is OK.  */
  51 _Noreturn _Noreturn void _Noreturn f9 (void);
  52
  53 /* _Noreturn does not affect type compatibility.  */
  54
  55 void (*fp) (void) = f5;
  56
  57 /* noreturn is an ordinary identifier.  */
  58
  59 int noreturn;