[driver][darwin] Pass -platform_version flag to the linker instead of the -<platform>_version_min flag

[arphaman]

Summary

In Xcode 11, ld added a new flag called -platform_version that can be used instead of the old -<platform>_version_min flags. The new flag allows Clang to pass the SDK version from the driver to the linker.
This patch adopts the new -platform_version flag in Clang, and starts using it by default, unless a linker version < 520 is passed to the driver.

[steven_wu]

clang/lib/Driver/ToolChains/Darwin.cpp

339

Why version '0' should go through the new path?

2530

Why not support that in this commit? I don't see problem returning a string with space inside.

[arphaman]

clang/lib/Driver/ToolChains/Darwin.cpp

339

Version 0 indicates that -mlinker-version= wasn't specified. We want to use the new flag by default.

2530

The rest of macCatalyst support is not yet upstreamed (specifically the new Environment value)

[steven_wu]

clang/lib/Driver/ToolChains/Darwin.cpp

2530

Doesn't this mean you hit llvm_unreachable when you link catalyst? And this is the default behavior?

[arphaman]

clang/lib/Driver/ToolChains/Darwin.cpp

2530

You can't link for macCatalyst with the current master Clang. I will modify the downstream Clang to pass in the right flag though.

[steven_wu]

SGTM.

[phosek]

I'm not sure if the detection is working correctly, this is failing on our macOS toolchain bots:

FAIL: Clang :: Driver/darwin-ld-platform-version-ios.c (5284 of 16450)
******************** TEST 'Clang :: Driver/darwin-ld-platform-version-ios.c' FAILED ********************
Script:
--
: 'RUN: at line 1';   touch /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-ios.c.tmp.o
: 'RUN: at line 3';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target arm64-apple-ios12.3 -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-ios.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-ios.c
: 'RUN: at line 5';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-ios13-simulator -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-ios.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck --check-prefix=SIMUL /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-ios.c
--
Exit Code: 1

Command Output (stderr):
--
/b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-ios.c:8:11: error: CHECK: expected string not found in input
// CHECK: "-platform_version" "ios" "12.3.0" "13.0"
          ^
<stdin>:1:1: note: scanning from here
Fuchsia clang version 10.0.0 (https://fuchsia.googlesource.com/a/third_party/llvm-project 1a8ff89653d2a80a013701fe927d2d32491bff59)
^
<stdin>:5:141: note: possible intended match here
 "/usr/bin/ld" "-demangle" "-lto_library" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/libLTO.dylib" "-dynamic" "-arch" "arm64" "-iphoneos_version_min" "12.3.0" "-syslibroot" "/b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk" "-o" "a.out" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-ios.c.tmp.o" "-lSystem" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/clang/10.0.0/lib/darwin/libclang_rt.ios.a"
                                                                                                                                            ^

--

********************
Testing:  0.. 10.. 20.. 30
FAIL: Clang :: Driver/darwin-ld-platform-version-macos.c (5286 of 16450)
******************** TEST 'Clang :: Driver/darwin-ld-platform-version-macos.c' FAILED ********************
Script:
--
: 'RUN: at line 1';   touch /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-macos.c.tmp.o
: 'RUN: at line 3';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-macos10.13 -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/MacOSX10.14.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-macos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-macos.c
: 'RUN: at line 5';   env SDKROOT=/b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/MacOSX10.14.sdk /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-macos10.13.0.1 -mlinker-version=520 -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-macos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-macos.c
: 'RUN: at line 10';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-macos10.13 -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-macos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck --check-prefix=NOSDK /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-macos.c
--
Exit Code: 1

Command Output (stderr):
--
/b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-macos.c:8:11: error: CHECK: expected string not found in input
// CHECK: "-platform_version" "macos" "10.13.0" "10.14"
          ^
<stdin>:1:1: note: scanning from here
Fuchsia clang version 10.0.0 (https://fuchsia.googlesource.com/a/third_party/llvm-project 1a8ff89653d2a80a013701fe927d2d32491bff59)
^
<stdin>:5:364: note: possible intended match here
 "/usr/bin/ld" "-demangle" "-lto_library" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/libLTO.dylib" "-dynamic" "-arch" "x86_64" "-macosx_version_min" "10.13.0" "-syslibroot" "/b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/MacOSX10.14.sdk" "-o" "a.out" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-macos.c.tmp.o" "-lSystem" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/clang/10.0.0/lib/darwin/libclang_rt.osx.a"
                                                                                                                                                                                                                                                                                                                                                                           ^

--

********************
Testing:  0.. 10.. 20.. 30
FAIL: Clang :: Driver/darwin-ld-platform-version-tvos.c (5287 of 16450)
******************** TEST 'Clang :: Driver/darwin-ld-platform-version-tvos.c' FAILED ********************
Script:
--
: 'RUN: at line 1';   touch /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-tvos.c.tmp.o
: 'RUN: at line 3';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target arm64-apple-tvos12.3 -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-tvos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-tvos.c
: 'RUN: at line 5';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-tvos13-simulator -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-tvos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck --check-prefix=SIMUL /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-tvos.c
--
Exit Code: 1

Command Output (stderr):
--
/b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-tvos.c:8:11: error: CHECK: expected string not found in input
// CHECK: "-platform_version" "tvos" "12.3.0" "13.0"
          ^
<stdin>:1:1: note: scanning from here
Fuchsia clang version 10.0.0 (https://fuchsia.googlesource.com/a/third_party/llvm-project 1a8ff89653d2a80a013701fe927d2d32491bff59)
^
<stdin>:6:359: note: possible intended match here
 "/usr/bin/ld" "-demangle" "-lto_library" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/libLTO.dylib" "-dynamic" "-arch" "arm64" "-tvos_version_min" "12.3.0" "-syslibroot" "/b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/iPhoneOS13.0.sdk" "-o" "a.out" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-tvos.c.tmp.o" "-lSystem"
                                                                                                                                                                                                                                                                                                                                                                      ^

--

********************
Testing:  0.. 10.. 20.. 30
FAIL: Clang :: Driver/darwin-ld-platform-version-watchos.c (5288 of 16450)
******************** TEST 'Clang :: Driver/darwin-ld-platform-version-watchos.c' FAILED ********************
Script:
--
: 'RUN: at line 1';   touch /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-watchos.c.tmp.o
: 'RUN: at line 3';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target arm64_32-apple-watchos5.2 -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/WatchOS6.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-watchos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-watchos.c
: 'RUN: at line 5';   /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/clang -target x86_64-apple-watchos6-simulator -isysroot /b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/WatchOS6.0.sdk -### /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-watchos.c.tmp.o 2>&1    | /b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/bin/FileCheck --check-prefix=SIMUL /b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-watchos.c
--
Exit Code: 1

Command Output (stderr):
--
/b/s/w/ir/k/llvm-project/clang/test/Driver/darwin-ld-platform-version-watchos.c:8:11: error: CHECK: expected string not found in input
// CHECK: "-platform_version" "watchos" "5.2.0" "6.0.0"
          ^
<stdin>:1:1: note: scanning from here
Fuchsia clang version 10.0.0 (https://fuchsia.googlesource.com/a/third_party/llvm-project 1a8ff89653d2a80a013701fe927d2d32491bff59)
^
<stdin>:5:363: note: possible intended match here
 "/usr/bin/ld" "-demangle" "-lto_library" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/lib/libLTO.dylib" "-dynamic" "-arch" "arm64_32" "-watchos_version_min" "5.2.0" "-syslibroot" "/b/s/w/ir/k/llvm-project/clang/test/Driver/Inputs/WatchOS6.0.sdk" "-o" "a.out" "/b/s/w/ir/k/recipe_cleanup/clangybBdXS/llvm_build_dir/tools/clang/test/Driver/Output/darwin-ld-platform-version-watchos.c.tmp.o" "-lSystem"
                                                                                                                                                                                                                                                                                                                                                                          ^

[arphaman]

@phosek Thanks, I think it reproduces on our macOS bots. I'll start fixing it right now.

[arphaman]

Looks like HOST_LINK_VERSION is influencing the decision. I should specify the version manually in the tests then.

[arphaman]

@phosek I fixed the tests in be88a20c900463c4919433109e4c17cd001da580

[dmajor]

clang/lib/Driver/ToolChains/Darwin.cpp

339

Hi. Just for anyone who isn't on the bugzilla thread: in https://bugs.llvm.org/show_bug.cgi?id=44813 I'd like to reconsider this decision about using the flag by default. It is a breaking change and is inconsistent with the other treatments of Version in this function. What do you all think? Thanks.

clang/lib/Driver/ToolChains/Darwin.h

public:
 
   virtual void addStartObjectFileArgs(const llvm::opt::ArgList &Args,
                                       llvm::opt::ArgStringList &CmdArgs) const {
   }
 
   virtual void addMinVersionArgs(const llvm::opt::ArgList &Args,
                                  llvm::opt::ArgStringList &CmdArgs) const {}
 
+  virtual void addPlatformVersionArgs(const llvm::opt::ArgList &Args,
+                                      llvm::opt::ArgStringList &CmdArgs) const {
+  }
+
   /// On some iOS platforms, kernel and kernel modules were built statically. Is
   /// this such a target?
   virtual bool isKernelStatic() const { return false; }
 
   /// Is the target either iOS or an iOS simulator?
   bool isTargetIOSBased() const { return false; }
 
   /// Options to control how a runtime library is linked.
std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args,
                                           types::ID InputType) const override;
 
   /// @name Apple Specific Toolchain Implementation
   /// {
 
   void addMinVersionArgs(const llvm::opt::ArgList &Args,
                          llvm::opt::ArgStringList &CmdArgs) const override;
 
+  void addPlatformVersionArgs(const llvm::opt::ArgList &Args,
+                              llvm::opt::ArgStringList &CmdArgs) const override;
+
   void addStartObjectFileArgs(const llvm::opt::ArgList &Args,
                               llvm::opt::ArgStringList &CmdArgs) const override;
 
   bool isKernelStatic() const override {
     return (!(isTargetIPhoneOS() && !isIPhoneOSVersionLT(6, 0)) &&
             !isTargetWatchOS());
   }
 

clang/lib/Driver/ToolChains/Darwin.cpp

void darwin::Linker::AddLinkArgs(Compilation &C, const ArgList &Args,
   Args.AddAllArgs(CmdArgs, options::OPT_exported__symbols__list);
   Args.AddLastArg(CmdArgs, options::OPT_flat__namespace);
   Args.AddAllArgs(CmdArgs, options::OPT_force__load);
   Args.AddAllArgs(CmdArgs, options::OPT_headerpad__max__install__names);
   Args.AddAllArgs(CmdArgs, options::OPT_image__base);
   Args.AddAllArgs(CmdArgs, options::OPT_init);
 
   // Add the deployment target.
+  if (!Version[0] || Version[0] >= 520)
+    MachOTC.addPlatformVersionArgs(Args, CmdArgs);
+  else
     MachOTC.addMinVersionArgs(Args, CmdArgs);
 
   Args.AddLastArg(CmdArgs, options::OPT_nomultidefs);
   Args.AddLastArg(CmdArgs, options::OPT_multi__module);
   Args.AddLastArg(CmdArgs, options::OPT_single__module);
   Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined);
   Args.AddAllArgs(CmdArgs, options::OPT_multiply__defined__unused);
 
   if (const Arg *A =
void Darwin::addMinVersionArgs(const ArgList &Args,
   else {
     assert(isTargetMacOS() && "unexpected target");
     CmdArgs.push_back("-macosx_version_min");
   }
 
   CmdArgs.push_back(Args.MakeArgString(TargetVersion.getAsString()));
 }
 
+static const char *getPlatformName(Darwin::DarwinPlatformKind Platform,
+                                   Darwin::DarwinEnvironmentKind Environment) {
+  switch (Platform) {
+  case Darwin::MacOS:
+    return "macos";
+  case Darwin::IPhoneOS:
+    if (Environment == Darwin::NativeEnvironment ||
+        Environment == Darwin::Simulator)
+      return "ios";
+    // FIXME: Add macCatalyst support here ("\"mac catalyst\"").
+    llvm_unreachable("macCatalyst isn't yet supported");
+  case Darwin::TvOS:
+    return "tvos";
+  case Darwin::WatchOS:
+    return "watchos";
+  }
+  llvm_unreachable("invalid platform");
+}
+
+void Darwin::addPlatformVersionArgs(const llvm::opt::ArgList &Args,
+                                    llvm::opt::ArgStringList &CmdArgs) const {
+  // -platform_version <platform> <target_version> <sdk_version>
+  // Both the target and SDK version support only up to 3 components.
+  CmdArgs.push_back("-platform_version");
+  std::string PlatformName = getPlatformName(TargetPlatform, TargetEnvironment);
+  if (TargetEnvironment == Darwin::Simulator)
+    PlatformName += "-simulator";
+  CmdArgs.push_back(Args.MakeArgString(PlatformName));
+  VersionTuple TargetVersion = getTargetVersion().withoutBuild();
+  CmdArgs.push_back(Args.MakeArgString(TargetVersion.getAsString()));
+  if (SDKInfo) {
+    VersionTuple SDKVersion = SDKInfo->getVersion().withoutBuild();
+    CmdArgs.push_back(Args.MakeArgString(SDKVersion.getAsString()));
+  } else {
+    // Use a blank SDK version if it's not present.
+    CmdArgs.push_back("0.0.0");
+  }
+}
+
 void Darwin::addStartObjectFileArgs(const ArgList &Args,
                                     ArgStringList &CmdArgs) const {
   // Derived from startfile spec.
   if (Args.hasArg(options::OPT_dynamiclib)) {
     // Derived from darwin_dylib1 spec.
     if (isTargetWatchOSBased()) {
       ; // watchOS does not need dylib1.o.
     } else if (isTargetIOSSimulator()) {

clang/test/Driver/Inputs/WatchOS6.0.sdk/SDKSettings.json

+{"Version":"6.0.0"}

clang/test/Driver/Inputs/iPhoneOS13.0.sdk/SDKSettings.json

+{"Version":"13.0"}

clang/test/Driver/darwin-infer-simulator-sdkroot.c

 // Check that SDKROOT does not infer simulator on when it points to a regular
 // SDK.
 // REQUIRES: system-darwin && native
 //
 // RUN: rm -rf %t/SDKs/iPhoneOS8.0.0.sdk
 // RUN: mkdir -p %t/SDKs/iPhoneOS8.0.0.sdk
-// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-IPHONE %s
-// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk IPHONEOS_DEPLOYMENT_TARGET=8.0 %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk IPHONEOS_DEPLOYMENT_TARGET=8.0 %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-IPHONE %s
 // CHECK-IPHONE: clang
 // CHECK-IPHONE: "-cc1"
 // CHECK-IPHONE: -apple-ios8.0.0"
 // CHECK-IPHONE: ld
 // CHECK-IPHONE: "-iphoneos_version_min" "8.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/iPhoneSimulator8.0.sdk
 // RUN: mkdir -p %t/SDKs/iPhoneSimulator8.0.sdk
-// RUN: env SDKROOT=%t/SDKs/iPhoneSimulator8.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/iPhoneSimulator8.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-SIMULATOR %s
 //
 // CHECK-SIMULATOR: clang
 // CHECK-SIMULATOR: "-cc1"
 // CHECK-SIMULATOR: -apple-ios8.0.0-simulator"
 // CHECK-SIMULATOR: ld
 // CHECK-SIMULATOR: "-ios_simulator_version_min" "8.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/WatchOS3.0.sdk
 // RUN: mkdir -p %t/SDKs/WatchOS3.0.sdk
-// RUN: env SDKROOT=%t/SDKs/WatchOS3.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/WatchOS3.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-WATCH %s
-// RUN: env WATCHOS_DEPLOYMENT_TARGET=3.0 %clang %s -isysroot %t/SDKs/WatchOS3.0.sdk -### 2>&1 \
+// RUN: env WATCHOS_DEPLOYMENT_TARGET=3.0 %clang %s -isysroot %t/SDKs/WatchOS3.0.sdk -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-WATCH %s
 //
 // CHECK-WATCH: clang
 // CHECK-WATCH: "-cc1"
 // CHECK-WATCH: -apple-watchos3.0.0"
 // CHECK-WATCH: ld
 // CHECK-WATCH: "-watchos_version_min" "3.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/WatchSimulator3.0.sdk
 // RUN: mkdir -p %t/SDKs/WatchSimulator3.0.sdk
-// RUN: env SDKROOT=%t/SDKs/WatchSimulator3.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/WatchSimulator3.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-WATCH-SIMULATOR %s
 //
 // CHECK-WATCH-SIMULATOR: clang
 // CHECK-WATCH-SIMULATOR: "-cc1"
 // CHECK-WATCH-SIMULATOR: -apple-watchos3.0.0-simulator"
 // CHECK-WATCH-SIMULATOR: ld
 // CHECK-WATCH-SIMULATOR: "-watchos_simulator_version_min" "3.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/AppleTVOS10.0.sdk
 // RUN: mkdir -p %t/SDKs/AppleTVOS10.0.sdk
-// RUN: env SDKROOT=%t/SDKs/AppleTVOS10.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/AppleTVOS10.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-TV %s
 //
 // CHECK-TV: clang
 // CHECK-TV: "-cc1"
 // CHECK-TV: -apple-tvos10.0.0"
 // CHECK-TV: ld
 // CHECK-TV: "-tvos_version_min" "10.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/AppleTVSimulator10.0.sdk
 // RUN: mkdir -p %t/SDKs/AppleTVSimulator10.0.sdk
-// RUN: env SDKROOT=%t/SDKs/AppleTVSimulator10.0.sdk %clang %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/AppleTVSimulator10.0.sdk %clang %s -mlinker-version=400 -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-TV-SIMULATOR %s
 //
 // CHECK-TV-SIMULATOR: clang
 // CHECK-TV-SIMULATOR: "-cc1"
 // CHECK-TV-SIMULATOR: -apple-tvos10.0.0-simulator"
 // CHECK-TV-SIMULATOR: ld
 // CHECK-TV-SIMULATOR: "-tvos_simulator_version_min" "10.0.0"

clang/test/Driver/darwin-ld-platform-version-ios.c

+// RUN: touch %t.o
+
+// RUN: %clang -target arm64-apple-ios12.3 -isysroot %S/Inputs/iPhoneOS13.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck %s
+// RUN: %clang -target x86_64-apple-ios13-simulator -isysroot %S/Inputs/iPhoneOS13.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=SIMUL %s
+
+// CHECK: "-platform_version" "ios" "12.3.0" "13.0"
+// SIMUL: "-platform_version" "ios-simulator" "13.0.0" "13.0"

clang/test/Driver/darwin-ld-platform-version-macos.c

+// RUN: touch %t.o
+
+// RUN: %clang -target x86_64-apple-macos10.13 -isysroot %S/Inputs/MacOSX10.14.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck %s
+// RUN: env SDKROOT=%S/Inputs/MacOSX10.14.sdk %clang -target x86_64-apple-macos10.13.0.1 -mlinker-version=520 -### %t.o 2>&1 \
+// RUN:   | FileCheck %s
+
+// CHECK: "-platform_version" "macos" "10.13.0" "10.14"
+
+// RUN: %clang -target x86_64-apple-macos10.13 -### %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=NOSDK %s
+// NOSDK: "-platform_version" "macos" "10.13.0" "0.0.0"

clang/test/Driver/darwin-ld-platform-version-tvos.c

+// RUN: touch %t.o
+
+// RUN: %clang -target arm64-apple-tvos12.3 -isysroot %S/Inputs/iPhoneOS13.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck %s
+// RUN: %clang -target x86_64-apple-tvos13-simulator -isysroot %S/Inputs/iPhoneOS13.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=SIMUL %s
+
+// CHECK: "-platform_version" "tvos" "12.3.0" "13.0"
+// SIMUL: "-platform_version" "tvos-simulator" "13.0.0" "13.0"

clang/test/Driver/darwin-ld-platform-version-watchos.c

+// RUN: touch %t.o
+
+// RUN: %clang -target arm64_32-apple-watchos5.2 -isysroot %S/Inputs/WatchOS6.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck %s
+// RUN: %clang -target x86_64-apple-watchos6-simulator -isysroot %S/Inputs/WatchOS6.0.sdk -### %t.o 2>&1 \
+// RUN:   | FileCheck --check-prefix=SIMUL %s
+
+// CHECK: "-platform_version" "watchos" "5.2.0" "6.0.0"
+// SIMUL: "-platform_version" "watchos-simulator" "6.0.0" "6.0.0"

clang/test/Driver/darwin-ld.c

 // Check that ld gets arch_multiple.
 
 // RUN: %clang -target i386-apple-darwin9 -arch i386 -arch x86_64 %s -### -o foo 2> %t.log
 // RUN: grep '".*ld.*" .*"-arch_multiple" "-final_output" "foo"' %t.log
 
 // Make sure we run dsymutil on source input files.
 // RUN: %clang -target i386-apple-darwin9 -### -g %s -o BAR 2> %t.log
 // RUN: grep -E '".*dsymutil(\.exe)?" "-o" "BAR.dSYM" "BAR"' %t.log
 // RUN: %clang -target i386-apple-darwin9 -### -g -filelist FOO %s -o BAR 2> %t.log
 // RUN: grep -E '".*dsymutil(\.exe)?" "-o" "BAR.dSYM" "BAR"' %t.log
 
 // Check linker changes that came with new linkedit format.
 // RUN: touch %t.o
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv6 -miphoneos-version-min=3.0 %t.o 2> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv6 -miphoneos-version-min=3.0 -dynamiclib %t.o 2>> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv6 -miphoneos-version-min=3.0 -bundle %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv6 -miphoneos-version-min=3.0 %t.o 2> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv6 -miphoneos-version-min=3.0 -dynamiclib %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv6 -miphoneos-version-min=3.0 -bundle %t.o 2>> %t.log
 // RUN: FileCheck -check-prefix=LINK_IPHONE_3_0 %s < %t.log
 
 // LINK_IPHONE_3_0: {{ld(.exe)?"}}
 // LINK_IPHONE_3_0: -iphoneos_version_min
 // LINK_IPHONE_3_0: 3.0.0
 // LINK_IPHONE_3_0-NOT: -lcrt1.3.1.o
 // LINK_IPHONE_3_0: -lcrt1.o
 // LINK_IPHONE_3_0: -lSystem
 // LINK_IPHONE_3_0: {{ld(.exe)?"}}
 // LINK_IPHONE_3_0: -dylib
 // LINK_IPHONE_3_0: -ldylib1.o
 // LINK_IPHONE_3_0: -lSystem
 // LINK_IPHONE_3_0: {{ld(.exe)?"}}
 // LINK_IPHONE_3_0: -lbundle1.o
 // LINK_IPHONE_3_0: -lSystem
 
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv7 -miphoneos-version-min=3.1 %t.o 2> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv7 -miphoneos-version-min=3.1 -dynamiclib %t.o 2>> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch armv7 -miphoneos-version-min=3.1 -bundle %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv7 -miphoneos-version-min=3.1 %t.o 2> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv7 -miphoneos-version-min=3.1 -dynamiclib %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch armv7 -miphoneos-version-min=3.1 -bundle %t.o 2>> %t.log
 // RUN: FileCheck -check-prefix=LINK_IPHONE_3_1 %s < %t.log
 
 // LINK_IPHONE_3_1: {{ld(.exe)?"}}
 // LINK_IPHONE_3_1: -iphoneos_version_min
 // LINK_IPHONE_3_1: 3.1.0
 // LINK_IPHONE_3_1-NOT: -lcrt1.o
 // LINK_IPHONE_3_1: -lcrt1.3.1.o
 // LINK_IPHONE_3_1: -lSystem
 // LINK_IPHONE_3_1: {{ld(.exe)?"}}
 // LINK_IPHONE_3_1: -dylib
 // LINK_IPHONE_3_1-NOT: -ldylib1.o
 // LINK_IPHONE_3_1: -lSystem
 // LINK_IPHONE_3_1: {{ld(.exe)?"}}
 // LINK_IPHONE_3_1-NOT: -lbundle1.o
 // LINK_IPHONE_3_1: -lSystem
 
-// RUN: %clang -target i386-apple-darwin9 -### -arch i386 -mios-simulator-version-min=3.0 %t.o 2> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch i386 -mios-simulator-version-min=3.0 -dynamiclib %t.o 2>> %t.log
-// RUN: %clang -target i386-apple-darwin9 -### -arch i386 -mios-simulator-version-min=3.0 -bundle %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch i386 -mios-simulator-version-min=3.0 %t.o 2> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch i386 -mios-simulator-version-min=3.0 -dynamiclib %t.o 2>> %t.log
+// RUN: %clang -target i386-apple-darwin9 -mlinker-version=400 -### -arch i386 -mios-simulator-version-min=3.0 -bundle %t.o 2>> %t.log
 // RUN: FileCheck -check-prefix=LINK_IOSSIM_3_0 %s < %t.log
 
 // LINK_IOSSIM_3_0: {{ld(.exe)?"}}
 // LINK_IOSSIM_3_0: -ios_simulator_version_min
 // LINK_IOSSIM_3_0: 3.0.0
 // LINK_IOSSIM_3_0-NOT: -lcrt1.o
 // LINK_IOSSIM_3_0: -lSystem
 // LINK_IOSSIM_3_0: {{ld(.exe)?"}}

 
 // RUN: %clang -target x86_64-apple-darwin10 -### %t.o \
 // RUN:   -lazy_library Library 2> %t.log
 //
 // RUN: FileCheck -check-prefix=LINK_LAZY_LIBRARY %s < %t.log
 // LINK_LAZY_LIBRARY: {{ld(.exe)?"}}
 // LINK_LAZY_LIBRARY: "-lazy_library" "Library"
 
-// RUN: %clang -target x86_64-apple-darwin10 -### %t.o 2> %t.log
-// RUN: %clang -target x86_64-apple-macosx10.7 -### %t.o 2>> %t.log
+// RUN: %clang -target x86_64-apple-darwin10 -mlinker-version=400 -### %t.o 2> %t.log
+// RUN: %clang -target x86_64-apple-macosx10.7 -mlinker-version=400 -### %t.o 2>> %t.log
 // RUN: FileCheck -check-prefix=LINK_VERSION_MIN %s < %t.log
 // LINK_VERSION_MIN: {{ld(.exe)?"}}
 // LINK_VERSION_MIN: "-macosx_version_min" "10.6.0"
 // LINK_VERSION_MIN: {{ld(.exe)?"}}
 // LINK_VERSION_MIN: "-macosx_version_min" "10.7.0"
 
 // RUN: %clang -target x86_64-apple-darwin12 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_NO_CRT1 %s < %t.log
 // LINK_NO_CRT1-NOT: crt
 
 // RUN: %clang -target armv7-apple-ios6.0 -miphoneos-version-min=6.0 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_NO_IOS_CRT1 %s < %t.log
 // LINK_NO_IOS_CRT1-NOT: crt
 
 // RUN: %clang -target arm64-apple-ios5.0 -miphoneos-version-min=5.0 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_NO_IOS_ARM64_CRT1 %s < %t.log
 // LINK_NO_IOS_ARM64_CRT1-NOT: crt
 
 // RUN: %clang -target x86_64-apple-ios6.0 -miphoneos-version-min=6.0 -fprofile-instr-generate -resource-dir=%S/Inputs/resource_dir -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_IOSSIM_PROFILE %s < %t.log
 // LINK_IOSSIM_PROFILE: {{ld(.exe)?"}}
 // LINK_IOSSIM_PROFILE: libclang_rt.profile_iossim.a
 // LINK_IOSSIM_PROFILE: libclang_rt.ios.a
 
-// RUN: %clang -target arm64-apple-tvos8.3 -mtvos-version-min=8.3 -resource-dir=%S/Inputs/resource_dir -### %t.o 2> %t.log
+// RUN: %clang -target arm64-apple-tvos8.3 -mlinker-version=400 -mtvos-version-min=8.3 -resource-dir=%S/Inputs/resource_dir -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_TVOS_ARM64 %s < %t.log
 // LINK_TVOS_ARM64: {{ld(.exe)?"}}
 // LINK_TVOS_ARM64: -tvos_version_min
 // LINK_TVOS_ARM64-NOT: crt
 // LINK_TVOS_ARM64-NOT: lgcc_s.1
 // LINK_TVOS_ARM64: libclang_rt.tvos.a
 
-// RUN: %clang -target arm64-apple-tvos8.3 -mtvos-version-min=8.3 -fprofile-instr-generate -resource-dir=%S/Inputs/resource_dir  -### %t.o 2> %t.log
+// RUN: %clang -target arm64-apple-tvos8.3 -mlinker-version=400 -mtvos-version-min=8.3 -fprofile-instr-generate -resource-dir=%S/Inputs/resource_dir  -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_TVOS_PROFILE %s < %t.log
 // LINK_TVOS_PROFILE: {{ld(.exe)?"}}
 // LINK_TVOS_PROFILE: libclang_rt.profile_tvos.a
 // LINK_TVOS_PROFILE: libclang_rt.tvos.a
 
-// RUN: %clang -target arm64-apple-tvos8.3 -mtvos-version-min=8.3 -resource-dir=%S/Inputs/resource_dir -### %t.o -lcc_kext 2> %t.log
+// RUN: %clang -target arm64-apple-tvos8.3 -mlinker-version=400 -mtvos-version-min=8.3 -resource-dir=%S/Inputs/resource_dir -### %t.o -lcc_kext 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_TVOS_KEXT %s < %t.log
 // LINK_TVOS_KEXT: {{ld(.exe)?"}}
 // LINK_TVOS_KEXT: libclang_rt.cc_kext_tvos.a
 // LINK_TVOS_KEXT: libclang_rt.tvos.a
 
-// RUN: %clang -target armv7k-apple-watchos2.0 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -### %t.o 2> %t.log
+// RUN: %clang -target armv7k-apple-watchos2.0 -mlinker-version=400 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_WATCHOS_ARM %s < %t.log
 // LINK_WATCHOS_ARM: {{ld(.exe)?"}}
 // LINK_WATCHOS_ARM: -watchos_version_min
 // LINK_WATCHOS_ARM-NOT: crt
 // LINK_WATCHOS_ARM-NOT: lgcc_s.1
 // LINK_WATCHOS_ARM: libclang_rt.watchos.a
 
-// RUN: %clang -target armv7k-apple-watchos2.0 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -fprofile-instr-generate -### %t.o 2> %t.log
+// RUN: %clang -target armv7k-apple-watchos2.0 -mlinker-version=400 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -fprofile-instr-generate -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_WATCHOS_PROFILE %s < %t.log
 // LINK_WATCHOS_PROFILE: {{ld(.exe)?"}}
 // LINK_WATCHOS_PROFILE: libclang_rt.profile_watchos.a
 // LINK_WATCHOS_PROFILE: libclang_rt.watchos.a
 
-// RUN: %clang -target armv7k-apple-watchos2.0 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -### %t.o -lcc_kext 2> %t.log
+// RUN: %clang -target armv7k-apple-watchos2.0 -mlinker-version=400 -mwatchos-version-min=2.0 -resource-dir=%S/Inputs/resource_dir -### %t.o -lcc_kext 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_WATCHOS_KEXT %s < %t.log
 // LINK_WATCHOS_KEXT: {{ld(.exe)?"}}
 // LINK_WATCHOS_KEXT: libclang_rt.cc_kext_watchos.a
 // LINK_WATCHOS_KEXT: libclang_rt.watchos.a
 
 // RUN: %clang -target i386-apple-darwin12 -pg -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_PG %s < %t.log
 // LINK_PG: -lgcrt1.o

 //
 // LINK_X86_64H_MULTIARCH: {{ld(.exe)?"}}
 // LINK_X86_64H_MULTIARCH: "x86_64h"
 
 // Check for the linker options to specify the iOS version when the
 // IPHONEOS_DEPLOYMENT_TARGET variable is used instead of the command-line
 // deployment target options.
 // RUN: env IPHONEOS_DEPLOYMENT_TARGET=7.0 \
-// RUN:   %clang -target arm64-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target arm64-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_IPHONEOS_VERSION_MIN %s < %t.log
 // RUN: env IPHONEOS_DEPLOYMENT_TARGET=7.0 \
-// RUN:   %clang -target i386-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target i386-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_IOS_SIMULATOR_VERSION_MIN %s < %t.log
 // LINK_IPHONEOS_VERSION_MIN: -iphoneos_version_min
 // LINK_IOS_SIMULATOR_VERSION_MIN: -ios_simulator_version_min
 
 // Ditto for tvOS....
 // RUN: env TVOS_DEPLOYMENT_TARGET=7.0 \
-// RUN:   %clang -target armv7-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target armv7-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_TVOS_VERSION_MIN %s < %t.log
 // RUN: env TVOS_DEPLOYMENT_TARGET=7.0 \
-// RUN:   %clang -target x86_64-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target x86_64-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_TVOS_SIMULATOR_VERSION_MIN %s < %t.log
 // LINK_TVOS_VERSION_MIN: -tvos_version_min
 // LINK_TVOS_SIMULATOR_VERSION_MIN: -tvos_simulator_version_min
 
 // ...and for watchOS.
 // RUN: env WATCHOS_DEPLOYMENT_TARGET=2.0 \
-// RUN:   %clang -target armv7k-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target armv7k-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_WATCHOS_VERSION_MIN %s < %t.log
 // RUN: env WATCHOS_DEPLOYMENT_TARGET=2.0 \
-// RUN:   %clang -target i386-apple-darwin -### %t.o 2> %t.log
+// RUN:   %clang -target i386-apple-darwin -mlinker-version=400 -### %t.o 2> %t.log
 // RUN: FileCheck -check-prefix=LINK_WATCHOS_SIMULATOR_VERSION_MIN %s < %t.log
 // LINK_WATCHOS_VERSION_MIN: -watchos_version_min
 // LINK_WATCHOS_SIMULATOR_VERSION_MIN: -watchos_simulator_version_min
 
 // Check -iframework gets forward to ld as -F
 // RUN: %clang -target x86_64-apple-darwin %s -iframework Bar -framework Foo -### 2>&1 | \
 // RUN:   FileCheck --check-prefix=LINK-IFRAMEWORK %s
 // LINK-IFRAMEWORK: {{ld(.exe)?"}}

clang/test/Driver/darwin-sdkroot.c

 //   env SDKROOT=/ cmd //c echo %SDKROOT%
 //
 // This test do pass using GnuWin32 env.exe.
 
 // Check if clang set the correct deployment target from -sysroot
 //
 // RUN: rm -rf %t/SDKs/iPhoneOS8.0.0.sdk
 // RUN: mkdir -p %t/SDKs/iPhoneOS8.0.0.sdk
-// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk %clang -target arm64-apple-darwin --sysroot="" %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/iPhoneOS8.0.0.sdk %clang -target arm64-apple-darwin -mlinker-version=400 --sysroot="" %s -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-IPHONE %s
 //
 // CHECK-IPHONE: clang
 // CHECK-IPHONE: "-cc1"
 // CHECK-IPHONE: "-triple" "arm64-apple-ios8.0.0"
 // CHECK-IPHONE: ld
 // CHECK-IPHONE: "-iphoneos_version_min" "8.0.0"
 //
 //
 // RUN: rm -rf %t/SDKs/iPhoneSimulator8.0.sdk
 // RUN: mkdir -p %t/SDKs/iPhoneSimulator8.0.sdk
-// RUN: env SDKROOT=%t/SDKs/iPhoneSimulator8.0.sdk %clang -target x86_64-apple-darwin --sysroot="" %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/iPhoneSimulator8.0.sdk %clang -target x86_64-apple-darwin -mlinker-version=400 --sysroot="" %s -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-SIMULATOR %s
 //
 // CHECK-SIMULATOR: clang
 // CHECK-SIMULATOR: "-cc1"
 // CHECK-SIMULATOR: "-triple" "x86_64-apple-ios8.0.0-simulator"
 // CHECK-SIMULATOR: ld
 // CHECK-SIMULATOR: "-ios_simulator_version_min" "8.0.0"
 //
 // RUN: rm -rf %t/SDKs/MacOSX10.10.0.sdk
 // RUN: mkdir -p %t/SDKs/MacOSX10.10.0.sdk
-// RUN: env SDKROOT=%t/SDKs/MacOSX10.10.0.sdk %clang -target x86_64-apple-darwin --sysroot="" %s -### 2>&1 \
+// RUN: env SDKROOT=%t/SDKs/MacOSX10.10.0.sdk %clang -target x86_64-apple-darwin -mlinker-version=400 --sysroot="" %s -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-MACOSX %s
 //
 // CHECK-MACOSX: clang
 // CHECK-MACOSX: "-cc1"
 // CHECK-MACOSX: "-triple" "x86_64-apple-macosx10.10.0"
 // CHECK-MACOSX: ld
 // CHECK-MACOSX: "-macosx_version_min" "10.10.0"

clang/test/Driver/target-triple-deployment.c

 // RUN: touch %t.o
-// RUN: %clang -target x86_64-apple-macosx10.4 -### %t.o 2> %t.log
-// RUN: %clang -target x86_64-apple-darwin9 -### %t.o 2>> %t.log
-// RUN: %clang -target x86_64-apple-macosx10.7 -### %t.o 2>> %t.log
+// RUN: %clang -target x86_64-apple-macosx10.4 -mlinker-version=400 -### %t.o 2> %t.log
+// RUN: %clang -target x86_64-apple-darwin9 -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target x86_64-apple-macosx10.7 -mlinker-version=400 -### %t.o 2>> %t.log
 //
-// RUN: %clang -target armv7-apple-ios -### %t.o 2>> %t.log
-// RUN: %clang -target armv7-apple-ios0.0 -### %t.o 2>> %t.log
-// RUN: %clang -target armv7-apple-ios1.2.3 -### %t.o 2>> %t.log
-// RUN: %clang -target armv7-apple-ios5.0 -### %t.o 2>> %t.log
-// RUN: %clang -target armv7-apple-ios7.0 -### %t.o 2>> %t.log
-// RUN: %clang -target arm64-apple-ios -### %t.o 2>> %t.log
+// RUN: %clang -target armv7-apple-ios -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target armv7-apple-ios0.0 -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target armv7-apple-ios1.2.3 -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target armv7-apple-ios5.0 -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target armv7-apple-ios7.0 -mlinker-version=400 -### %t.o 2>> %t.log
+// RUN: %clang -target arm64-apple-ios -mlinker-version=400 -### %t.o 2>> %t.log
 //
 // RUN: FileCheck %s < %t.log
 
 // CHECK: {{ld(.exe)?"}}
 // CHECK: -macosx_version_min
 // CHECK: 10.4.0
 // CHECK: {{ld(.exe)?"}}
 // CHECK: -macosx_version_min

llvm/include/llvm/Support/VersionTuple.h

public:
 
   /// Retrieve the build version number, if provided.
   Optional<unsigned> getBuild() const {
     if (!HasBuild)
       return None;
     return Build;
   }
 
+  /// Return a version tuple that contains only the first 3 version components.
+  VersionTuple withoutBuild() const {
+    if (HasBuild)
+      return VersionTuple(Major, Minor, Subminor);
+    return *this;
+  }
+
   /// Determine if two version numbers are equivalent. If not
   /// provided, minor and subminor version numbers are considered to be zero.
   friend bool operator==(const VersionTuple &X, const VersionTuple &Y) {
     return X.Major == Y.Major && X.Minor == Y.Minor &&
            X.Subminor == Y.Subminor && X.Build == Y.Build;
   }
 
   /// Determine if two version numbers are not equivalent.