gcc/testsuite/gcc.dg/cpp/macro5.c

   1 /* { dg-do preprocess } */
   2
   3 /* Test source Robert Lipe, with minor modifications for the testsuite
   4    by Neil Booth.  29 Oct 2000.  */
   5
   6 #define _VA_ARGS_0() 42
   7 #define _L_0()                      (
   8 #define _R_0()                      )
   9
  10 #define __VA_ARGLIST(argc,list) \
  11                 _VA_ARGS_##argc list
  12
  13 #define _CAT_LIST(argc,list1,list2) \
  14                 _L_##argc list1 _R_##argc list2
  15
  16 #define _VA_ARGLIST(argc,list1,list2) \
  17                 __VA_ARGLIST(argc, \
  18                         _CAT_LIST(argc, list1, list2))
  19
  20 #define BLAH(a) _VA_ARGLIST(a, (), ())
  21
  22 #if BLAH (0) != 42
  23 #error Simulated varargs macros
  24 #endif