1  /* Test for a bogus warning on comparison between signed and unsigned.
       2     Origin: Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 5/13/2001.  */
       3  
       4  /* { dg-do compile } */
       5  /* { dg-options "-fshow-column -Wsign-compare -fstrict-overflow" } */
       6  
       7  extern void bar(void);
       8  
       9  int foo(int x, int y, unsigned u)
      10  {
      11    /* A COMPOUND_EXPR is non-negative if the last element is known to
      12       be non-negative.  */
      13    if (u < (bar(), -1)) /*{ dg-warning "9:different signedness" "COMPOUND_EXPR" }*/
      14      return x;
      15    if (u < (bar(), 10))
      16      return x;
      17    if ((bar(), 10) < u)
      18      return x;
      19    if (u < (x ? (bar(),bar(),bar(),bar(),x==y) : 10))
      20      return x;
      21    if ((x ? 10 : (bar(),bar(),bar(),bar(),x==y)) < u)
      22      return x;
      23  
      24    /* Test an ABS_EXPR, which is by definition non-negative when
      25       -fstrict-overflow is used.  */
      26    if (u < __builtin_abs(x))
      27      return x;
      28    if (__builtin_abs(x) < u)
      29      return x;
      30    if (u < (x ? __builtin_abs(x) : 10))
      31      return x;
      32    if ((x ? 10: __builtin_abs(x)) < u)
      33      return x;
      34  
      35    /* A MODIFY_EXPR is non-negative if the new value is known to be
      36       non-negative.  */
      37    if (u < (x = -1)) /* { dg-warning "9:different signedness" "MODIFY_EXPR" } */
      38      return x;
      39    if (u < (x = 10))
      40      return x;
      41    if ((x = 10) < u)
      42      return x;
      43    if (u < (x = (y ? (x==y) : 10)))
      44      return x;
      45    if ((x = (y ? 10 : (x==y))) < u)
      46      return x;
      47  
      48    return 0;
      49  }