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  }