gcc/testsuite/gcc.dg/20020104-1.c

   1 /* Test whether statement with no effect warnings are not given for last
   2    statements inside of statement expression.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O -Wall" } */
   5
   6 void bar (char *p, char *q);
   7
   8 int main()
   9 {
  10   char foo [32], *p;
  11
  12   ({
  13     void *s = (foo);
  14     __builtin_memset (s, '\0', sizeof (foo));
  15     s; /* { dg-warning "no effect" "statement with no effect warning" } */
  16     s; /* { dg-bogus "no effect" "bogus statement with no effect warning" } */
  17   });
  18   p = foo;
  19   p;   /* { dg-warning "no effect" "statement with no effect warning" } */
  20   bar (foo, p);
  21   return 0;
  22 }