gcc/testsuite/gcc.dg/setjmp-1.c

   1 /* Test for bogus "variable `x' may be clobbered by longjmp" warnings.
   2    Inspired by cse.c:simplify_relational_operation. */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O -Wclobbered -Wextra -Wall" } */
   6 /* { dg-skip-if "" { ! nonlocal_goto } } */
   7
   8 #include <setjmp.h>
   9
  10 extern void set_float_handler (jmp_buf *);
  11
  12 #define EQ 0x01
  13 #define LT 0x02
  14 #define GT 0x04
  15
  16 int
  17 compare_float (double a, double b)  /* { dg-bogus "clobbered" "spurious clobbered warning" } */
  18 {
  19   jmp_buf handler;
  20   int result;
  21
  22   a += 1.0;
  23
  24   if (setjmp (handler))
  25     {
  26       set_float_handler (0);
  27       return 0;
  28     }
  29
  30   set_float_handler (&handler);
  31   if (a == b) result = EQ;
  32   else if (a > b) result = LT;
  33   else if (a < b) result = GT;
  34   else result = 0;
  35   set_float_handler (0);
  36   return result;
  37 }