gcc/testsuite/c-c++-common/attr-fallthrough-2.c

   1 /* PR c/7652 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wall -Wextra -Wno-unused -Wno-implicit-fallthrough" } */
   4
   5 extern void bar (int);
   6 void
   7 fn (int i)
   8 {
   9   switch (i)
  10   {
  11   case 1:
  12     bar (1);
  13     __attribute__((used));
  14     /* { dg-warning "empty declaration" "" { target c } .-1 } */
  15     /* { dg-warning "ignored" "" { target c++ } .-2 } */
  16   case 2:
  17     bar (1);
  18     __attribute__((foo));
  19     /* { dg-warning "empty declaration" "" { target c } .-1 } */
  20     /* { dg-warning "ignored" "" { target c++ } .-2 } */
  21   case 3:
  22     bar (1);
  23     __attribute__((fallthrough)) /* { dg-warning "not followed" "" { target c } } */
  24   case 4: /* { dg-error "expected" } */
  25     bar (1);
  26     __attribute__((fallthrough)) 1;
  27     /* { dg-error "expected" "" { target c } .-1 } */
  28     /* { dg-warning "not followed" "" { target *-*-* } .-2 } */
  29   case 5:
  30     bar (1);
  31     __attribute__((fallthrough)) int i; /* { dg-warning "ignored|not followed" } */
  32   case 6:
  33     bar (1);
  34     __attribute__((fallthrough ("x"))); /* { dg-warning "specified with a parameter" } */
  35   case 7:
  36     bar (1);
  37     __attribute__((fallthrough, fallthrough)); /* { dg-warning "specified multiple times" } */
  38   case 8:
  39     bar (1);
  40     __attribute__((fallthrough));
  41   case 9:
  42     __attribute__((fallthrough));
  43     /* { dg-warning "not preceding" "" { target *-*-* } .-1 } */
  44     bar (1);
  45   case 10:
  46     bar (1);
  47     __attribute__((unused, fallthrough)); /* { dg-warning "attribute ignored" } */
  48   case 11:
  49     bar (1);
  50     __attribute__((fallthrough, unused)); /* { dg-warning "attribute ignored" } */
  51   default:
  52     bar (99);
  53   }
  54 }