gcc/testsuite/gcc.dg/redecl-4.c

   1 /* Test for multiple declarations and composite types, with built-in
   2    functions.  */
   3 /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=c89 -Wformat -g" } */
   6
   7 void
   8 f (void)
   9 {
  10   int printf;
  11   int strcmp;
  12   {
  13     int printf (const char *, ...);
  14     int strcmp ();
  15     /* Should get format warnings even though the built-in declaration
  16        isn't "visible".  */
  17     printf ("%s", 1); /* { dg-warning "format" } */
  18     /* The type of strcmp here should have no prototype.  */
  19     if (0)
  20       strcmp (1);
  21     /* Likewise, implicitly declared memcmp.  */
  22     if (0)
  23       memcmp (1);
  24   }
  25 }
  26
  27 /* Should still diagnose incompatible prototype for strcmp.  */
  28 int strcmp (void); /* { dg-error "conflict" } */