[PATCH] Clang/driver: emulated TLS mode.

[Chih-Hung Hsieh]

I see your question now. At the beginning I was looking for a way to set up
some configuration flag too for *-*-android targets to tell LLVM how to
lower TLS code. Trying to recognize "android" environment in LLVM seems too
restricted, as the emulated model could be useful to any target.

The existing -ftls-model looks like a natural hook to me.
This allows any target to support multiple TLS models and let users choose
which model to compile. The __attribute__((tls_model(...)) syntax seems
also a nice feature to keep, so I added the "emulated" mode into both
-ftls-model and tls_model attributes. As you can see in this patch and the
other LLVM patch, I was testing multiple models at the same time.


http://reviews.llvm.org/D10524

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