[v3] c++0x includes

[Paolo Carlini]

Doug Gregor wrote:

> In addition to -std=c++0x, there is also -std=gnu++0x, which adds the
> C++0x features but retains GNU extensions. It's just like -std=c++
> (which enables strict C++98/03) vs. -std=gnu++ (this is the default).
>
> So, I suggest just changing the C++0x testing in libstdc++ to use 
> -std=gnu++0x.

Ah, ah, thanks Doug, the comparison to -std=c++ / -std=gnu++ (*the 
default*) is extremely clarifying. Therefore I agree that we should use 
-std=gnu++0x in the new tests. Benjamin?

Paolo.