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diff -ur llvm-project-apple-stable-20191106/llvm/include/llvm/Support/RWMutex.h llvm-project-apple-stable-20191106+iOS/llvm/include/llvm/Support/RWMutex.h
--- llvm-project-apple-stable-20191106/llvm/include/llvm/Support/RWMutex.h 2019-12-03 19:28:47.000000000 -1000
+++ llvm-project-apple-stable-20191106+iOS/llvm/include/llvm/Support/RWMutex.h 2019-12-04 13:58:07.000000000 -1000
@@ -19,12 +19,29 @@
#include <mutex>
#include <shared_mutex>
+#if defined(__APPLE__)
// std::shared_timed_mutex is only availble on macOS 10.12 and later.
-#if defined(__APPLE__) && defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
+#if defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101200
#define LLVM_USE_RW_MUTEX_IMPL
#endif
+// std::shared_timed_mutex is only availble on iOS 10 and later.
+#elif defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__)
+#if __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 100000
+#define LLVM_USE_RW_MUTEX_IMPL
+#endif
+// std::shared_timed_mutex is only availble on tvOS 10 and later.
+#elif defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__)
+#if __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ < 100000
+#define LLVM_USE_RW_MUTEX_IMPL
+#endif
+// std::shared_timed_mutex is only availble on watchOS 3 and later.
+#elif defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__)
+#if __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ < 30000
+#define LLVM_USE_RW_MUTEX_IMPL
+#endif
#endif
+#endif // __APPLE__
namespace llvm {
namespace sys {
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