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
   7 #include <setjmp.h>
   8
   9 extern void set_float_handler (jmp_buf *);
  10
  11 #define EQ 0x01
  12 #define LT 0x02
  13 #define GT 0x04
  14
  15 int
  16 compare_float (double a, double b)  /* { dg-bogus "clobbered" "spurious clobbered warning" } */
  17 {
  18   jmp_buf handler;
  19   int result;
  20
  21   a += 1.0;
  22
  23   if (setjmp (handler))
  24     {
  25       set_float_handler (0);
  26       return 0;
  27     }
  28
  29   set_float_handler (&handler);
  30   if (a == b) result = EQ;
  31   else if (a > b) result = LT;
  32   else if (a < b) result = GT;
  33   else result = 0;
  34   set_float_handler (0);
  35   return result;
  36 }