Index: cfe/trunk/lib/Driver/ToolChains.h
===================================================================
--- cfe/trunk/lib/Driver/ToolChains.h
+++ cfe/trunk/lib/Driver/ToolChains.h
@@ -496,6 +496,8 @@
     return TargetVersion < VersionTuple(V0, V1, V2);
   }
 
+  StringRef getOSLibraryNameSuffix() const;
+
 public:
   /// }
   /// @name ToolChain Implementation
Index: cfe/trunk/lib/Driver/ToolChains.cpp
===================================================================
--- cfe/trunk/lib/Driver/ToolChains.cpp
+++ cfe/trunk/lib/Driver/ToolChains.cpp
@@ -319,6 +319,26 @@
   }
 }
 
+StringRef Darwin::getOSLibraryNameSuffix() const {
+  switch(TargetPlatform) {
+  case DarwinPlatformKind::MacOS:
+    return "osx";
+  case DarwinPlatformKind::IPhoneOS:
+    return "ios";
+  case DarwinPlatformKind::IPhoneOSSimulator:
+    return "iossim";
+  case DarwinPlatformKind::TvOS:
+    return "tvos";
+  case DarwinPlatformKind::TvOSSimulator:
+    return "tvossim";
+  case DarwinPlatformKind::WatchOS:
+    return "watchos";
+  case DarwinPlatformKind::WatchOSSimulator:
+    return "watchossim";
+  }
+  llvm_unreachable("Unsupported platform");
+}
+
 void Darwin::addProfileRTLibs(const ArgList &Args,
                               ArgStringList &CmdArgs) const {
   if (!needsProfileRT(Args)) return;
@@ -363,12 +383,11 @@
     // Sanitizer runtime libraries requires C++.
     AddCXXStdlibLibArgs(Args, CmdArgs);
   }
-  // ASan is not supported on watchOS.
-  assert(isTargetMacOS() || isTargetIOSSimulator());
-  StringRef OS = isTargetMacOS() ? "osx" : "iossim";
+
   AddLinkRuntimeLib(
       Args, CmdArgs,
-      (Twine("libclang_rt.") + Sanitizer + "_" + OS + "_dynamic.dylib").str(),
+      (Twine("libclang_rt.") + Sanitizer + "_" +
+       getOSLibraryNameSuffix() + "_dynamic.dylib").str(),
       /*AlwaysLink*/ true, /*IsEmbedded*/ false,
       /*AddRPath*/ true);
 
@@ -1221,8 +1240,7 @@
 
 SanitizerMask Darwin::getSupportedSanitizers() const {
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
-  if (isTargetMacOS() || isTargetIOSSimulator())
-    Res |= SanitizerKind::Address;
+  Res |= SanitizerKind::Address;
   if (isTargetMacOS()) {
     if (!isMacosxVersionLT(10, 9))
       Res |= SanitizerKind::Vptr;
Index: cfe/trunk/test/Driver/darwin-sanitizer-ld.c
===================================================================
--- cfe/trunk/test/Driver/darwin-sanitizer-ld.c
+++ cfe/trunk/test/Driver/darwin-sanitizer-ld.c
@@ -11,16 +11,6 @@
 // CHECK-ASAN: "-rpath" "{{.*}}lib{{.*}}darwin"
 
 // RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
-// RUN:   -fsanitize=address -mios-simulator-version-min=7.0 %s -o %t.o 2>&1 \
-// RUN:   | FileCheck --check-prefix=CHECK-ASAN-IOSSIM %s
-
-// CHECK-ASAN-IOSSIM: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-IOSSIM: lc++
-// CHECK-ASAN-IOSSIM: libclang_rt.asan_iossim_dynamic.dylib"
-// CHECK-ASAN-IOSSIM: "-rpath" "@executable_path"
-// CHECK-ASAN-IOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
-
-// RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
 // RUN:   -fPIC -shared -fsanitize=address %s -o %t.so 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-DYN-ASAN %s
 
@@ -65,3 +55,63 @@
 
 // CHECK-DYN-BOUNDS: "{{.*}}ld{{(.exe)?}}"
 // CHECK-DYN-BOUNDS-NOT: ubsan_osx
+
+// RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
+// RUN:   -fsanitize=address -mios-simulator-version-min=7.0 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-IOSSIM %s
+
+// CHECK-ASAN-IOSSIM: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-IOSSIM: lc++
+// CHECK-ASAN-IOSSIM: libclang_rt.asan_iossim_dynamic.dylib"
+// CHECK-ASAN-IOSSIM: "-rpath" "@executable_path"
+// CHECK-ASAN-IOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
+
+// RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
+// RUN:   -fsanitize=address -mtvos-simulator-version-min=8.3.0 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-TVOSSIM %s
+
+// CHECK-ASAN-TVOSSIM: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-TVOSSIM: lc++
+// CHECK-ASAN-TVOSSIM: libclang_rt.asan_tvossim_dynamic.dylib"
+// CHECK-ASAN-TVOSSIM: "-rpath" "@executable_path"
+// CHECK-ASAN-TVOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
+
+// RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
+// RUN:   -fsanitize=address -mwatchos-simulator-version-min=2.0.0 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-WATCHOSSIM %s
+
+// CHECK-ASAN-WATCHOSSIM: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-WATCHOSSIM: lc++
+// CHECK-ASAN-WATCHOSSIM: libclang_rt.asan_watchossim_dynamic.dylib"
+// CHECK-ASAN-WATCHOSSIM: "-rpath" "@executable_path"
+// CHECK-ASAN-WATCHOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
+
+// RUN: %clang -no-canonical-prefixes -### -target armv7-apple-ios  \
+// RUN:   -fsanitize=address -miphoneos-version-min=7 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-IOS %s
+
+// CHECK-ASAN-IOS: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-IOS: lc++
+// CHECK-ASAN-IOS: libclang_rt.asan_ios_dynamic.dylib"
+// CHECK-ASAN-IOS: "-rpath" "@executable_path"
+// CHECK-ASAN-IOS: "-rpath" "{{.*}}lib{{.*}}darwin"
+
+// RUN: %clang -no-canonical-prefixes -### -target arm64-apple-tvos \
+// RUN:   -fsanitize=address -mtvos-version-min=8.3 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-TVOS %s
+
+// CHECK-ASAN-TVOS: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-TVOS: lc++
+// CHECK-ASAN-TVOS: libclang_rt.asan_tvos_dynamic.dylib"
+// CHECK-ASAN-TVOS: "-rpath" "@executable_path"
+// CHECK-ASAN-TVOS: "-rpath" "{{.*}}lib{{.*}}darwin"
+
+// RUN: %clang -no-canonical-prefixes -### -target armv7k-apple-watchos \
+// RUN:   -fsanitize=address -mwatchos-version-min=2.0 %s -o %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-WATCHOS %s
+
+// CHECK-ASAN-WATCHOS: "{{.*}}ld{{(.exe)?}}"
+// CHECK-ASAN-WATCHOS: lc++
+// CHECK-ASAN-WATCHOS: libclang_rt.asan_watchos_dynamic.dylib"
+// CHECK-ASAN-WATCHOS: "-rpath" "@executable_path"
+// CHECK-ASAN-WATCHOS: "-rpath" "{{.*}}lib{{.*}}darwin"
Index: cfe/trunk/test/Driver/fsanitize.c
===================================================================
--- cfe/trunk/test/Driver/fsanitize.c
+++ cfe/trunk/test/Driver/fsanitize.c
@@ -230,7 +230,7 @@
 // CHECK-VPTR-DARWIN-NEW: -fsanitize=alignment,vptr
 
 // RUN: %clang -target armv7-apple-ios7 -miphoneos-version-min=7.0 -fsanitize=address %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-IOS
-// CHECK-ASAN-IOS: unsupported option '-fsanitize=address' for target 'arm-apple-ios7'
+// CHECK-ASAN-IOS: -fsanitize=address
 
 // RUN: %clang -target i386-pc-openbsd -fsanitize=address %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-OPENBSD
 // CHECK-ASAN-OPENBSD: unsupported option '-fsanitize=address' for target 'i386-pc-openbsd'