gcc/testsuite/gcc.dg/tree-ssa/noreturn-1.c

   1 /* { dg-do compile } *
   2 /* { dg-options "-O2 -fdump-tree-ssa -std=gnu11" } */
   3 /* { dg-final { scan-tree-dump-times "__builtin_unreachable" 4 "ssa" } } */
   4
   5 void bar1 (void);
   6 void bar2 (void);
   7 void bar3 (void);
   8 void bar4 (void);
   9
  10 _Noreturn void
  11 foo1 (int *p, int y)
  12 {
  13   bar1 ();
  14   *p = y;
  15   return;       /* { dg-warning "function declared 'noreturn' has a 'return' statement" } */
  16 }               /* { dg-warning "'noreturn' function does return" "" { target *-*-* } .-1 } */
  17
  18 _Noreturn void
  19 foo2 (int *p, int y)
  20 {
  21   bar2 ();
  22   *p = y;
  23 }               /* { dg-warning "'noreturn' function does return" } */
  24
  25 _Noreturn void
  26 foo3 (int *p, int y)
  27 {
  28   if (y > 10)
  29     return;     /* { dg-warning "function declared 'noreturn' has a 'return' statement" } */
  30   bar3 ();
  31   *p = y;
  32   return;       /* { dg-warning "function declared 'noreturn' has a 'return' statement" } */
  33 }               /* { dg-warning "'noreturn' function does return" } */
  34
  35 _Noreturn void
  36 foo4 (int *p, int y)
  37 {
  38   if (y > 10)
  39     return;     /* { dg-warning "function declared 'noreturn' has a 'return' statement" } */
  40   bar4 ();
  41   *p = y;
  42 }               /* { dg-warning "'noreturn' function does return" } */