gcc/testsuite/gcc.dg/Wparentheses-10.c

   1 /* Test operation of -Wparentheses.  Warnings for assignments used as
   2    truth-values shouldn't apply other than for plain assignment.  */
   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 void
  14 bar (void)
  15 {
  16   if (a += b)
  17     foo (0);
  18   if (a -= a)
  19     foo (1);
  20   if (b *= c)
  21     foo (2);
  22   else
  23     foo (3);
  24   if (b /= b)
  25     foo (4);
  26   else
  27     foo (5);
  28   while (c %= b)
  29     foo (6);
  30   while (c <<= c)
  31     foo (7);
  32   do foo (8); while (a >>= b);
  33   do foo (9); while (a &= a);
  34   for (;c ^= b;)
  35     foo (10);
  36   for (;c |= c;)
  37     foo (11);
  38   d = a += b;
  39   foo (12);
  40   d = a -= a;
  41   foo (13);
  42 }