gcc/testsuite/gcc.dg/c2x-attr-fallthrough-5.c

   1 /* Test C2x fallthrough attribute: mixtures with other attributes.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "-std=c2x -pedantic-errors" } */
   4
   5 /* Use of other standard attributes together with "fallthrough" goes
   6    through a different path to diagnosing ignored attributes from that
   7    used in attribute declarations without "fallthrough".  Verify that
   8    such ignored attributes result in a pedwarn (for use in a context
   9    not permitted in the constraints for those attributes) in this case
  10    as well.  */
  11
  12 int
  13 f (int a)
  14 {
  15   switch (a)
  16     {
  17     case 1:
  18       a++;
  19       [[fallthrough, deprecated]]; /* { dg-error "attribute ignored" } */
  20     case 2:
  21       a++;
  22       [[maybe_unused]] [[fallthrough]]; /* { dg-error "attribute ignored" } */
  23     case 3:
  24       a++;
  25       [[__nodiscard__, fallthrough]]; /* { dg-error "attribute ignored" } */
  26     case 4:
  27       a++;
  28     }
  29   return a;
  30 }