[v3] c++0x <system_error> CD updates

[Paolo Carlini]

Chris Fairles wrote:
> I have a feeling I'm missing something obvious here...
>   
I think this is one of those static initialization order issues, often
very annoying.

In fact, these:

  static const error_category& system_category = get_system_category();
  ...

didn't really convince me, when I looked at the existing code: at
minimum, we are going to have one instance of system_category & co in
each translation unit. No good. Can't we export the statics from the
.so, as usual in such cases?

Paolo.