[Issue 15523] extern(C++) support TLS (C++ 'thread_local') linkage?

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15523

--- Comment #11 from Manu <turkeyman at gmail.com> ---
This isn't a mangling issue, it's an ABI issue.
It's not clear if extern C++ and D TLS vars can link to each other.

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