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I can't remember, has Apple bothered enabling thread-local storage in its clang distribution yet?

Apple's clang supports thread_local as of XCode 8: https://stackoverflow.com/questions/28094794/why-does-apple-...

Better late than never, I suppose. The answer indicates it might be ABI incompatible with upstream clang though? I'm sure that can cause a lot of fun...

The last time I checked, only for POC. In my uuid library [0], macOS is basically the only one I can’t create a per-thread rng and instead have to spin up a new one each time.

0: https://github.com/neosmart/uuidxx

It's frustrating, because TLS works fine on vanilla clang or newish gcc on Mac OS x.

FWIW, macOS has arc4random(3) and arc4random_buf(3).

Thank you. It was supposed to be a platform-agnostic uuid library embracing the benefits of C++11 and beyond. But that was a pipe dream :)

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