[PATCH] libc++: Make support for thread-unsafe C functions optional

[Marshall Clow]

Except for the bit in locale.cpp, these changes look OK to me.

I'm concerned about the proliferation of "subsets" of the libc++ functionality (no threads, no filesystem, no thread-unsafe fns), but ...


================
Comment at: src/locale.cpp:579
@@ -578,2 +578,3 @@
+#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
     if (g.name() != "*")
         setlocale(LC_ALL, g.name().c_str());
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Unlike all the other changes, this is a behavior change.

http://reviews.llvm.org/D8703

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