gcc/testsuite/gcc.dg/c23-unproto-4.c

   1 /* Test that declaring a function with () is the same as (void) in C23.
   2    Invalid use cases.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=c23 -pedantic-errors" } */
   5
   6 void f1 (); /* { dg-message "previous declaration" } */
   7 void f1 (int); /* { dg-error "conflicting types" } */
   8
   9 void f2 (); /* { dg-message "declared here" } */
  10
  11 void
  12 f3 (void)
  13 {
  14   f2 (1); /* { dg-error "too many arguments" } */
  15 }