using xlocale to implement std::locale class

[Paolo Carlini]

Hi,
> Constructively, I would also encourage you to submit fixes, preferably 
> of a sort not breaking the binary compatibility (otherwise, we can 
> still look into the patches now, but would be targeted at the ABI 
> breaking branch opened by Francois)
>
> Â… but Francois's more recent patch in that bug seems to work without 
> changing the ABI. I must've missed the notification from Bugzilla.
Indeed, I remember Francois made very good progress on those issues, 
then something tricky surfaced (recently, on this mailing list). It 
would be great if you two could collaborate...

Paolo.