bug in GCC or C++ standard ?

["Mark Tall" <mtall dot qld at gmail dot com>]

Hello,

I've come across an oddity in C++, involving anonymous unions and
const variables. Neither of the two classes below will compile using
gcc 4.3.0.  Is this a bug in gcc or the C++ standard itself ?

class my_class_1
  {
  union
    {
    const int x;
    const int y;
    };

  my_class_1() : x(0), y(0) {}
  };


class my_class_2
  {
  union
    {
    const int x;
    const int y;
    };

  my_class_2() : x(0) {}
  };


compiler output:

my_class.cpp: In constructor 'my_class_1::my_class_1()':
my_class.cpp:10: error: initializations for multiple members of
'my_class_1::<anonymous union>'
my_class.cpp: In constructor 'my_class_2::my_class_2()':
my_class.cpp:22: error: uninitialized member 'my_class_2::<anonymous
union>::y' with 'const' type 'const int'