Which version of Appleā€™s clang did you try for C++14? The latest version 
available is Apple LLVM version 9.0.0 (clang-900.0.22.8).

> On Jul 29, 2017, at 2:38 AM, Michael Park <mp...@apache.org> wrote:
> I'd like to drop support for Apple Clang.
> With the C++14 upgrade, we'll be requiring many distros to fetch a newer
> compiler. In most cases it only takes a few commands to get a newer
> compiler. This is also true of OS X, where clang-4.0 can be easily
> installed with `brew install llvm`.
> The current codebase does not compile with Apple Clang under C++14 mode. We
> could choose to investigate whether this is a Mesos bug or an Apple Clang
> bug, but after doing a brief investigation myself, I feel like it's not
> worth the effort. There are already cases where we need to install a new
> compiler on OS X due to Apple Clang releases based on clang-3.8 (MESOS-5745
> <https://issues.apache.org/jira/browse/MESOS-5745>).
> Not that Apple Clang was "officially" supported anyway, but we have had
> minor workarounds (e.g., THREAD_LOCAL) to support it.
> Please let me know what you think!
> Thanks,
> MPark

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