[libcxx] r342073 - Implement the infrastructure for feature-test macros. Very few actual feature test macros, though. Reviewed as: https://reviews.llvm.org/D51955

[Marshall Clow via cfe-commits]

On Thu, Oct 4, 2018 at 8:41 AM Richard Smith <richard at metafoo.co.uk> wrote:

> Perhaps libc++ could provide a __version file that contains the headers,
> and use #include <__version> internally? We'd still need a <version> header
> that just includes <__version> for conformance, but that should be after
> user headers on the include path so shouldn't break things.
>

We can do this - but I'm not sure we would be doing anyone any favors in
the long run by doing so.

-- Marshall
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