gcc/testsuite/gnat.dg/scalar_mode_agg_compare.adb

   1 -- { dg-do run }
   2
   3 procedure Scalar_Mode_Agg_Compare is
   4
   5    type Point is record
   6       Mapped : Boolean;
   7       Tag    : String (1 .. 2);  -- HImode
   8    end record;
   9    pragma Pack (Point);          -- Tag possibly at bitpos 1
  10
  11    function My_Point return Point is
  12    begin
  13       return (Mapped => True, Tag => "XX");
  14    end;
  15
  16    A, B : Point := My_Point;
  17 begin
  18    -- The comparison below should find the two Tag fields equal and not
  19    -- attempt to take their address, which might not be byte aligned.
  20
  21    if A.Tag /= B.Tag then
  22       raise Program_Error;
  23    end if;
  24 end;
  25