1  /* Test for a bogus warning on comparison between signed and unsigned.
       2     This was inspired by code in gcc. */
       3  
       4  /* { dg-do compile } */
       5  /* { dg-options "-Wsign-compare" } */
       6  
       7  int tf = 1;
       8  
       9  void f(int x, unsigned int y)
      10  {
      11    /* ?: branches are constants.  */
      12    x > (tf?64:128); /* { dg-bogus "changes signedness" "case 1" } */
      13    y > (tf?64:128); /* { dg-bogus "changes signedness" "case 2" } */
      14  
      15    /* ?: branches are (recursively) constants.  */
      16    x > (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 3" } */
      17    y > (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 4" } */
      18  
      19    /* ?: branches are signed constants.  */
      20    x > (tf?64:-1); /* { dg-bogus "changes signedness" "case 5" } */
      21    y > (tf?64:-1); /* { dg-warning "different signedness" "case 6" } */
      22  
      23    /* ?: branches are (recursively) signed constants.  */
      24    x > (tf?64:(tf?128:-1)); /* { dg-bogus "changes signedness" "case 7" } */
      25    y > (tf?64:(tf?128:-1)); /* { dg-warning "different signedness" "case 8" } */
      26  
      27    /* Statement expression.  */
      28    x > ({tf; 64;}); /* { dg-bogus "changes signedness" "case 9" } */
      29    y > ({tf; 64;}); /* { dg-bogus "changes signedness" "case 10" } */
      30  
      31    /* Statement expression with recursive ?: .  */
      32    x > ({tf; tf?64:(tf?128:256);}); /* { dg-bogus "changes signedness" "case 11" } */
      33    y > ({tf; tf?64:(tf?128:256);}); /* { dg-bogus "changes signedness" "case 12" } */
      34  
      35    /* Statement expression with signed ?:.  */
      36    x > ({tf; tf?64:-1;}); /* { dg-bogus "changes signedness" "case 13" } */
      37    y > ({tf; tf?64:-1;}); /* { dg-warning "different signedness" "case 14" } */
      38  
      39    /* Statement expression with recursive signed ?:.  */
      40    x > ({tf; tf?64:(tf?128:-1);}); /* { dg-bogus "changes signedness" "case 15" } */
      41    y > ({tf; tf?64:(tf?128:-1);}); /* { dg-warning "different signedness" "case 16" } */
      42  
      43    /* ?: branches are constants.  */
      44    tf ? x : (tf?64:32); /* { dg-bogus "changes signedness" "case 17" } */
      45    tf ? y : (tf?64:32); /* { dg-bogus "changes signedness" "case 18" } */
      46  
      47    /* ?: branches are signed constants.  */
      48    tf ? x : (tf?64:-1); /* { dg-bogus "changes signedness" "case 19" } */
      49    tf ? y : (tf?64:-1); /* { dg-warning "changes signedness" "case 20" } */
      50  
      51    /* ?: branches are (recursively) constants.  */
      52    tf ? x : (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 21" } */
      53    tf ? y : (tf?64:(tf?128:256)); /* { dg-bogus "changes signedness" "case 22" } */
      54  
      55    /* ?: branches are (recursively) signed constants.  */
      56    tf ? x : (tf?64:(tf?128:-1)); /* { dg-bogus "changes signedness" "case 23" } */
      57    tf ? y : (tf?64:(tf?128:-1)); /* { dg-warning "changes signedness" "case 24" } */
      58  }