gcc/testsuite/gcc.dg/sequence-pt-pr17880.c

   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 }