gcc/testsuite/gcc.dg/cpp/macro8.c

   1 /* { dg-do compile } */
   2 /* { dg-options -std=gnu89 } */
   3
   4 /* GCC 2.95.2 used to get the following variable argument macro
   5    expansions wrong.
   6
   7    Source: Neil Booth, from PR 3852 with persmission.  31 Jul 2001.  */
   8
   9 #define TEST_WORSE(args...) (5, ## args)
  10 #define TEST_BAD(foo, args...) (2, (foo), ## args)
  11
  12 extern void abort ();
  13
  14 static int add (int a, int b)
  15 {
  16   return a + b;
  17 }
  18
  19 int main ()
  20 {
  21   /* Would expand to a single closing parenthesis, maybe because of
  22      the "no args requires space" brokenness.  */
  23   if (TEST_WORSE () != 5)
  24     abort ();
  25   /* The macro would expand to (0, (0) with a missing closing parenthesis.  */
  26   if (add TEST_BAD (5) != 7)
  27     abort ();
  28   return 0;
  29 }