Allow libc++ to be built on systems without POSIX threads
If you're crazy enough to want this sort of thing, then add
-D_LIBCPP_HAS_NO_THREADS to your CXXFLAGS and
--param=additiona_features=libcpp-has-no-threads to your lit commnad line.
http://reviews.llvm.org/D3969
llvm-svn: 217271
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: b3fcc67f8f13cd95d36ed29d0ae1308decb9e099
diff --git a/include/thread b/include/thread
index 1f1e4a2..808d76b 100644
--- a/include/thread
+++ b/include/thread
@@ -106,6 +106,10 @@
#define __STDCPP_THREADS__ __cplusplus
+#ifdef _LIBCPP_HAS_NO_THREADS
+#error <thread> is not supported on this single threaded system
+#else // !_LIBCPP_HAS_NO_THREADS
+
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
@@ -455,4 +459,6 @@
_LIBCPP_END_NAMESPACE_STD
+#endif // !_LIBCPP_HAS_NO_THREADS
+
#endif // _LIBCPP_THREAD