gcc/testsuite/gcc.dg/parm-incomplete-1.c

   1 /* Test warnings and errors for incomplete parameter types.  Should
   2    not be warned for in declarations that are not definitions: bug
   3    17881.  Void types may be a special case, especially for unnamed
   4    parameters and when qualified or with a storage class specifier;
   5    see C90 6.5.4.3, DR#017 Q14, C90 TC1, DR#157, C99 J.2 (referencing
   6    C99 6.7.5.3); the precise rules are unclear.  */
   7 /* Origin: Joseph Myers <jsm@polyomino.org.uk> */
   8 /* { dg-do compile } */
   9 /* { dg-options "" } */
  10
  11 struct s;
  12 void f (struct s);
  13 void (*g)(struct s);
  14 struct t { void (*p)(struct s); };
  15
  16 struct s { int b; };
  17 void h (struct s x) { }
  18
  19 void j(struct t2); /* { dg-warning "'struct t2' declared inside parameter list" } */
  20
  21 union u;
  22
  23 void v(union u x) { } /* { dg-error "parameter 1 \\('x'\\) has incomplete type" } */
  24
  25 void p(void x); /* { dg-warning "parameter 1 \\('x'\\) has void type" } */
  26
  27 void q(const void x); /* { dg-warning "parameter 1 \\('x'\\) has void type" } */