1  /* PR 17880 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-Wsequence-point" } */
       4  
       5  int
       6  foo (int x)
       7  {
       8    unsigned int a;
       9    int b;
      10  
      11    b = (a += 5) > a;  /* { dg-warning "undefined" "sequence point warning" } */
      12    b = (a += 5) + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
      13    b = (a -= 5) > a;  /* { dg-warning "undefined" "sequence point warning" } */
      14    b = (a -= 5) + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
      15    b = a-- > a;  /* { dg-warning "undefined" "sequence point warning" } */
      16    b = a-- + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
      17    b = ++a > a;  /* { dg-warning "undefined" "sequence point warning" } */
      18    b = ++a + a == 10;  /* { dg-warning "undefined" "sequence point warning" } */
      19  
      20    if ((a += 5) > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      21    if ((a += 5) + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      22    if ((a -= 5) > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      23    if ((a -= 5) + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      24    if (a-- > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      25    if (a-- + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      26    if (++a > a) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      27    if (++a + a == 10) return -1;  /* { dg-warning "undefined" "sequence point warning" } */
      28    do {} while ((a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
      29    while ((a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
      30    for ((a += 5) > a;;);  /* { dg-warning "undefined" "sequence point warning" } */
      31    for (b = (a += 5) > a;;);  /* { dg-warning "undefined" "sequence point warning" } */
      32    for (; (a += 5) > a;);  /* { dg-warning "undefined" "sequence point warning" } */
      33    for (;; b = (a += 5) > a);  /* { dg-warning "undefined" "sequence point warning" } */
      34    for (;; a++ + a++);  /* { dg-warning "undefined" "sequence point warning" } */
      35    if (a) a++ - a--;    /* { dg-warning "undefined" "sequence point warning" } */
      36    ((a +=5) > a) ? a : b; /* { dg-warning "undefined" "sequence point warning" } */
      37    return (a++ - a--); /* { dg-warning "undefined" "sequence point warning" } */
      38  }
      39  
      40  void bar (int i)
      41  {
      42    int a = i++ - i++; /* { dg-warning "undefined" "sequence point warning" } */
      43  } 
      44  
      45  void baz (int i)
      46  {
      47    switch (i++ + i++)  /* { dg-warning "undefined" "sequence point warning" } */
      48      {
      49      case 1:
      50        i++ - i++;  /* { dg-warning "undefined" "sequence point warning" } */
      51      case 2:
      52        break;
      53      }
      54  }