gcc/testsuite/gcc.dg/cpp/strp2.c

   1 /* { dg-do run } */
   2
   3 /* Test for odd corner cases in stringizing/pasting.
   4    Taken more or less verbatim from C99 section 6.10.3.3.  */
   5
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #define hash_hash # ## #
  10 #define mkstr(a) # a
  11 #define in_between(a) mkstr(a)
  12 #define join(c, d) in_between(c hash_hash d)
  13
  14 const char p[] = join(x, y);
  15 const char q[] = "x ## y";
  16
  17 int
  18 main (void)
  19 {
  20   if (strcmp (p, q))
  21     abort ();
  22   return 0;
  23 }