windows - Visual C++ 2008 variables overlap in memory -

i've got strange problem. i've got program i'm using static variables (some of objects including other variables) , of them seem overlap in memory in _debug_ mode. program rather complex , i've not yet had time reproduce in smaller use case. looks this:

struct bar   {     int i; ...  };  class  {  public:  bar b; ...  };  class b {  public:  static foo f; ...   static a; }; 

i set break point @ _tmaincrtstartup in order see happens _before_ of code ran. once break point hit, i'm looking @ variables , addresses in watch window , see following picture:

&b::f - 0x00fa68e0  &(b::a.b) - 0x00fa68cc   sizeof(b::a.b) - 28 

but (0x00fa68e0 - 0x00fa68cc) = 20

so, these variables overlap in memory (if change "i", object affected). started looking @ map file b::a defined @ 0x00fa6340.

so linker or compiler bug? no code has ran yet, yet there memory overlap here.

have come across in vs 2008?

is known bug, there workaround or missing in code?