用于进行gcc测试

				/* Test for constant expressions: const variable with value 0 is not a				   null pointer constant so the conditional expression should have				   type void * and the assignment is OK.  */				/* Origin: Joseph Myers  */				/* { dg-do compile } */				/* { dg-options "-std=iso9899:1999 -O2" } */				int *p;				long *q;				static void *const n = 0;				int j;				void f(void) { q = j ? p : n; }