__attribute__((packed)) and trivial types

[Pedro Lamarão]

With GCC 4.7 and the following program:

--
struct byte
{
   unsigned char _;

   byte () = default;

   explicit operator unsigned char () { return _; }
};

struct wyde
{
   unsigned short _;

   wyde () = default;

   constexpr wyde (unsigned short r) : _(r) { }
};

struct foo
{
   byte one;
   wyde two;
}
__attribute__((packed));

auto main (int argc, char * argv[]) -> int
{
   foo f;
   return 0;
}
--

I am receiving this warning:

../main.cpp:22:8: warning: ignoring packed attribute because of unpacked 
non-POD field ‘wyde foo::two’ [enabled by default]

Should this decision be adjusted to take trivial types into account?

--
  P.