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 (
  18             "%s", 1); /* { dg-warning "15:format" } */
  19     /* The type of strcmp here should have no prototype.  */
  20     if (0)
  21       strcmp (1);
  22     /* Likewise, implicitly declared memcmp.  */
  23     if (0)
  24       memcmp (1);
  25   }
  26 }
  27
  28 /* Should still diagnose incompatible prototype for strcmp.  */
  29 int strcmp (void); /* { dg-error "conflict" } */
  30
  31 /* { dg-prune-output "\\\[-Wbuiltin-declaration-mismatch]" }
  32    { dg-prune-output "\\\[-Wint-conversion]" } */