Remove the __GXX_EXPERIMENTAL_CXX0X__?

[Gabriel Dos Reis]

On Wed, Jul 3, 2013 at 4:39 PM, Ed Smith-Rowland <3dw4rd@verizon.net> wrote:
> While thinking about C++ n3694 feature test macros I noticed we still define
> __GXX_EXPERIMENTAL_CXX0X__ macro in c-family/c-cppbuiltin.c.
> We got rid of all uses of it in libstdc++.
> I propose we get rid of it here too.
> User's shouldn't be relying on it.  No?
>
> OTOH, it may have been a proxy for __cplusplus for users for a good while.
> People may still be using it even if the library no longer uses it.
>
> What do folks think?

Deprecate it for 4.9.x.
Remove it later.  We don't need to keep around
this macro which has been obsolete for at least
two releases.

-- Gaby