gcc/testsuite/gcc.dg/cpp/macro3.c

   1 /* { dg-do run } */
   2 /* { dg-options "-std=c99" } */
   3
   4 /* First two tests sourced from a bug report of Thomas Pornin.
   5    Varargs test source Jamie Lokier.
   6    All adapted for the testsuite by Neil Booth, Oct 2000.  */
   7
   8 /* Tests various macro abuse is correctly expanded.  */
   9 static int d = 4;
  10 #define c(x) d
  11 #define d(x) c(2)
  12
  13 #if 0
  14 /* This macro chain above sucks up the whole file once it starts, so
  15    I've commented it out.  The example is left for idle amusement :-) */
  16 #define a(x) b(
  17 #define b(x) a(
  18 #endif
  19
  20 #define apply(...)   apply2 (__VA_ARGS__)
  21 #define half(x)      ((x) / 2)
  22 #define apply2(f,x)  f (x)
  23
  24 extern void abort (void);
  25 extern void exit (int);
  26
  27 int main()
  28 {
  29   /* Expands to c(2) then d.  */
  30   if (c(c)(c) != 4)
  31     abort ();
  32
  33   if (apply (half, 200) != 100)
  34     abort ();
  35
  36   exit (0);
  37 }