gcc/testsuite/gcc.dg/cpp/19921210-1.c

   1 /* Test for proper disabling of macros within their own expansions.  */
   2 /* { dg-do compile } */
   3
   4 /* The following is a trick to evaluate a complex boolean expression
   5    at compile time, inspired by autoconf 2.13's sizeof-detection.  */
   6
   7 enum { a = 4, f = 3 };
   8
   9 #define a1(y) (y+2)
  10 #define a2(y) a1(y)+1
  11 #define f a+f
  12
  13 char array[(a2(f)) == 10 ? 1 : -1];