[PATCH] Test that the single-threaded lit feature is available iff the corresponding guard is #defined

[Jonathan Roelofs]

Hi EricWF, mclow.lists, danalbert,

Inspired by the test @ericwf added in r220722.

http://reviews.llvm.org/D6006

Files:
  test/atomics/libcpp-has-no-threads.pass.cpp

Index: test/atomics/libcpp-has-no-threads.pass.cpp
===================================================================
--- test/atomics/libcpp-has-no-threads.pass.cpp
+++ test/atomics/libcpp-has-no-threads.pass.cpp
@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// XFAIL: libcpp-has-no-threads
+
+int main()
+{
+  // Together with the XFAIL above, ensure that libcpp-has-no-threads is set as
+  // a LIT feature iff _LIBCPP_HAS_NO_THREADS is defined:
+#ifdef _LIBCPP_HAS_NO_THREADS
+  return -1;
+#else
+  return 0;
+#endif
+}

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