[PATCH] [libcxx] Allow <atomic> to be used in c++03.

[Chandler Carruth]

On Fri, Nov 14, 2014 at 11:02 PM, Eric Fiselier <eric at efcs.ca> wrote:

> > I also don't like that we're not implementing a complete `<atomic>` in
> C++03 mode. Sounds like another good reason to not support it to me.
>
> Fair point. The only lost functionality is initialization with an `=` sign
> in it. This is more a loss of syntax than it is functionality.


This is more significant than you're making it out to be, especially in
C++03.

There is no unambiguous initialization *other* than '=' available in C++03.
=/ This makes defining correct statically initialized atomic globals very
hard, and that is a pretty fundamental use case.

I think that if we're going to make <atomic> work as an extension in C++03,
we should make this work. If we can't, we should tell users to use
stdatomic.h and C11 atomics. =/
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