[libcxx] r285382 - Add __libcpp_version file and __libcpp_library_version function.

[Eric Fiselier via cfe-commits]

> As I said, this is not a decision based on the libc++ version.

It is at least partially based on the libc++ version. We obviously can't
enable the feature if libc++ does not yet support them.

/Eric

On Sun, Oct 30, 2016 at 2:00 PM, Joerg Sonnenberger via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> On Sun, Oct 30, 2016 at 01:49:53PM -0600, Eric Fiselier via cfe-commits
> wrote:
> > >  E.g. presence of libc++ won't tell you if you can use sized
> deallocation
> > > as that's a ABI library issue.
> >
> >  The value of __libcpp_version could easily be updated by vendors to
> store
> > the version of the system dylib,
> > so I don't see why this wouldn't work.
>
> As I said, this is not a decision based on the libc++ version. When we
> start adding random extra flags to the version file, it makes the point
> I'm raising even bigger: we are duplicating data and clang should not be
> magically changing its behavior like that anyway.
>
> Joerg
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