gcc/testsuite/gnat.dg/warn4.adb

   1 -- { dg-do compile }
   2 -- { dg-options "-O2" }
   3
   4 with Unchecked_Conversion;
   5
   6 procedure Warn4 is
   7
   8    type POSIX_Character is new Standard.Character;
   9    type POSIX_String is array (Positive range <>) of aliased POSIX_Character;
  10
  11    type String_Ptr is access all String;
  12    type POSIX_String_Ptr is access all POSIX_String;
  13
  14    function sptr_to_psptr is new Unchecked_Conversion -- { dg-warning "aliasing problem" }
  15      (String_Ptr, POSIX_String_Ptr); -- { dg-warning "" "" { target *-*-* } 14 }
  16
  17    function To_POSIX_String (Str : String) return POSIX_String;
  18    function To_POSIX_String (Str : String)
  19       return POSIX_String is
  20    begin
  21       return sptr_to_psptr (Str'Unrestricted_Access).all;
  22    end To_POSIX_String;
  23
  24    A : Boolean;
  25    S : String := "ABCD/abcd";
  26    P : Posix_String := "ABCD/abcd";
  27
  28 begin
  29    A := To_POSIX_String (S) = P;
  30 end;