gcc/testsuite/gcc.dg/mismatch-decl-1.c

   1 /* This test assumes -fbuiltin and not -fansi to get "index" and "memchr" builtin DECLs.  */
   2 /* { dg-do compile } */
   3 /* { dg-options "" } */
   4
   5 /* The bug this is testing is that if a new decl conflicts with an
   6    explicit decl, you don't get the "changes type of builtin" message,
   7    but if there was *also* a builtin, you *also* don't get the
   8    "previous declaration was here" message, leaving you with no clue
   9    where the previous declaration came from.  */
  10
  11 extern char foo(int,int); /* { dg-message "previous declaration of 'foo' was here" } */
  12 extern char *index(const char *,int); /* { dg-message "previous declaration of 'index' was here" } */
  13
  14 /* This changes the type of "index", which is both a builtin and an
  15    explicit decl.  */
  16 int index; /* { dg-error "redeclared as different kind of symbol" } */
  17
  18 /* This changes the type of "memchr", which is only a builtin.  */
  19 int memchr; /* { dg-warning "built-in function 'memchr' declared as non-function" } */
  20
  21 /* This changes the type of "foo", which is only an explicit decl.  */
  22 int foo; /* { dg-error "redeclared as different kind of symbol" } */