gcc/testsuite/gcc.dg/Wparentheses-3.c

   1 /* Test operation of -Wparentheses.  Warnings for assignments used as
   2    truth-values.  */
   3 /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
   4
   5 /* { dg-do compile } */
   6 /* { dg-options "-Wparentheses -std=gnu99" } */
   7
   8 int foo (int);
   9
  10 int a, b, c;
  11 _Bool d;
  12
  13 int
  14 bar (void)
  15 {
  16   if (a = b) /* { dg-warning "assignment" "correct warning" } */
  17     foo (0);
  18   if ((a = b))
  19     foo (1);
  20   if (a = a) /* { dg-warning "assignment" "correct warning" } */
  21     foo (2);
  22   if ((a = a))
  23     foo (3);
  24   if (b = c) /* { dg-warning "assignment" "correct warning" } */
  25     foo (4);
  26   else
  27     foo (5);
  28   if ((b = c))
  29     foo (6);
  30   else
  31     foo (7);
  32   if (b = b) /* { dg-warning "assignment" "correct warning" } */
  33     foo (8);
  34   else
  35     foo (9);
  36   if ((b = b))
  37     foo (10);
  38   else
  39     foo (11);
  40   while (c = b) /* { dg-warning "assignment" "correct warning" } */
  41     foo (12);
  42   while ((c = b))
  43     foo (13);
  44   while (c = c) /* { dg-warning "assignment" "correct warning" } */
  45     foo (14);
  46   while ((c = c))
  47     foo (15);
  48   do foo (16); while (a = b); /* { dg-warning "assignment" "correct warning" } */
  49   do foo (17); while ((a = b));
  50   do foo (18); while (a = a); /* { dg-warning "assignment" "correct warning" } */
  51   do foo (19); while ((a = a));
  52   for (;c = b;) /* { dg-warning "assignment" "correct warning" } */
  53     foo (20);
  54   for (;(c = b);)
  55     foo (21);
  56   for (;c = c;) /* { dg-warning "assignment" "correct warning" } */
  57     foo (22);
  58   for (;(c = c);)
  59     foo (23);
  60   d = a = b; /* { dg-warning "assignment" "correct warning" } */
  61   foo (24);
  62   d = (a = b);
  63   foo (25);
  64   d = a = a; /* { dg-warning "assignment" "correct warning" } */
  65   foo (26);
  66   d = (a = a);
  67   foo (27);
  68 }