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

[via Digitalmars-d-bugs]

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

--- Comment #4 from Manu <turkeyman at gmail.com> ---
I would suggest that since 'thread_local' is C++11 standard, then that should
be the one.

Since '__thread' is not standard, I imagine it would be best supported by
GDC(/Clang?) via the @attribute("__thread") mechanism that they support for
their compiler-specific attributes.

extern(C++):

// Standard:
extern int i; // thread_local

// GCC(/Clang?):
@attribute("__thread") extern int i; // __thread (this is probably very easy
for those toolchains to implement)

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