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

   1 /* Test GNU parameter forward declarations.  */
   2 /* Origin: Joseph Myers <joseph@codesourcery.com> */
   3 /* { dg-do compile } */
   4 /* { dg-options "" } */
   5
   6 /* Valid uses.  */
   7 int f1(int a; int a);
   8 int f2(int a; int a) { return 0; }
   9 int f3(int a; int a; int a);
  10 int f4(int a; int a; int a) { return 0; }
  11 int f5(int a; int (*x)[a], int a);
  12 int f6(int a; int (*x)[a], int a) { return 0; }
  13 int f7(int a; int (*x)[a]; int (*y)[x[1][2]], int (*x)[a], int a);
  14 int f8(int a; int (*x)[a]; int (*y)[x[1][2]], int (*x)[a], int a) { return 0; }
  15
  16 /* Strange uses accepted by GCC 4.0 but not by 3.4 and probably not
  17    desirable to accept.  */
  18 int g1(int a;); /* { dg-error "just a forward declaration" "no parms" { xfail *-*-* } } */
  19 int g2(int a; __attribute__((unused))); /* { dg-error "just a forward declaration" "no parms" { xfail *-*-* } } */
  20 int g3(int;); /* { dg-error "just a forward declaration" "no parms" { xfail *-*-* } } */
  21 int g4(int, long;); /* { dg-error "just a forward declaration" "no parms" { xfail *-*-* } } */
  22
  23 /* Invalid uses.  */
  24 int h1(int a; int b); /* { dg-error "just a forward declaration" } */
  25 int h2(int; int b); /* { dg-error "just a forward declaration" } */
  26 int h3(int a; long a); /* { dg-error "conflicting types|previous definition|just a forward declaration" } */