Fix breakage caused when _LIBCPP_HAS_THREAD_API_PTHREAD is manually defined
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291298 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index 3a0e71e..a05bd92 100644
--- a/include/__config
+++ b/include/__config
@@ -894,7 +894,8 @@
#endif
// Thread API
-#if !defined(_LIBCPP_HAS_NO_THREADS)
+#if !defined(_LIBCPP_HAS_NO_THREADS) && \
+ !defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
# if defined(__FreeBSD__) || \
defined(__Fuchsia__) || \
defined(__NetBSD__) || \
@@ -902,9 +903,7 @@
defined(__APPLE__) || \
defined(__CloudABI__) || \
defined(__sun__)
-# ifndef _LIBCPP_HAS_THREAD_API_PTHREAD
-# define _LIBCPP_HAS_THREAD_API_PTHREAD
-# endif
+# define _LIBCPP_HAS_THREAD_API_PTHREAD
# else
# error "No thread API"
# endif // _LIBCPP_HAS_THREAD_API
