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

[Ed Schouten]

In http://reviews.llvm.org/D8703#148896, @EricWF wrote:

> The CMake and LIT stuff LGTM. However I would rather keep the directory structure in test/std the same as the structure of the C++ standard clauses. Could you rename the fail tests, put them in the correct directories and use `// REQUIRES: libcpp-has-no-thread-unsafe-c-functions`?


Sure! Just to make sure I understand it correctly: in this specific case, the tests should be called:

  test/std/utilities/date.time/asctime.fail.cpp
  test/std/utilities/date.time/ctime.fail.cpp
  test/std/utilities/date.time/gmtime.fail.cpp
  test/std/utilities/date.time/localtime.fail.cpp

As in, the same as they are right now, but without the no.thread.unsafe.c.functions component in between?


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