Clang driver changes for iOS 5.0 and OS X Lion support.

Check whether the libc++ library is available when using -stdlib=libc++,
and also adjust the check for whether to link with -lgcc_s.1.
Patch by Ted Kremenek and Daniel Dunbar.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141374 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 43 insertions, 3 deletions

diff --git a/include/clang/Basic/DiagnosticDriverKinds.td b/include/clang/Basic/DiagnosticDriverKinds.td
index f76af053d9..3c0e4f53d3 100644
--- a/include/clang/Basic/DiagnosticDriverKinds.td
+++ b/include/clang/Basic/DiagnosticDriverKinds.td
@@ -65,6 +65,9 @@ def err_drv_command_signalled : Error<
   "%0 command failed due to signal %1 (use -v to see invocation)">;
 def err_drv_invalid_mfloat_abi : Error<
   "invalid float ABI '%0'">;
+def err_drv_invalid_libcxx_deployment : Error<
+  "invalid deployment target for -stdlib=libc++ (requires %0 or later)">;
+
 def err_drv_I_dash_not_supported : Error<
   "'%0' not supported, please use -iquote instead">;
 def err_drv_unknown_argument : Error<"unknown argument: '%0'">;
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 63f827fa61..07481c1ee3 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -48,7 +48,8 @@ using namespace clang;
 
 Darwin::Darwin(const HostInfo &Host, const llvm::Triple& Triple)
   : ToolChain(Host, Triple), TargetInitialized(false),
-    ARCRuntimeForSimulator(ARCSimulator_None)
+    ARCRuntimeForSimulator(ARCSimulator_None),
+    LibCXXForSimulator(LibCXXSimulator_None)
 {
   // Compute the initial Darwin version based on the host.
   bool HadExtra;
@@ -421,8 +422,9 @@ void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
   if (isTargetIPhoneOS()) {
     // If we are compiling as iOS / simulator, don't attempt to link libgcc_s.1,
     // it never went into the SDK.
-    if (!isTargetIOSSimulator())
-        CmdArgs.push_back("-lgcc_s.1");
+    // Linking against libgcc_s.1 isn't needed for iOS 5.0+
+    if (isIPhoneOSVersionLT(5, 0) && !isTargetIOSSimulator())
+      CmdArgs.push_back("-lgcc_s.1");
 
     // We currently always need a static runtime library for iOS.
     AddLinkRuntimeLib(Args, CmdArgs, "libclang_rt.ios.a");
@@ -503,6 +505,8 @@ void Darwin::AddDeploymentTarget(DerivedArgList &Args) const {
             Major < 10 && Minor < 100 && Micro < 100) {
           ARCRuntimeForSimulator = Major < 5 ? ARCSimulator_NoARCRuntime
                                              : ARCSimulator_HasARCRuntime;
+          LibCXXForSimulator = Major < 5 ? LibCXXSimulator_NotAvailable
+                                         : LibCXXSimulator_Available;
         }
         break;
       }
@@ -910,6 +914,33 @@ DerivedArgList *Darwin::TranslateArgs(const DerivedArgList &Args,
   // argument.
   AddDeploymentTarget(*DAL);
 
+  // Validate the C++ standard library choice.
+  CXXStdlibType Type = GetCXXStdlibType(*DAL);
+  if (Type == ToolChain::CST_Libcxx) {
+    switch (LibCXXForSimulator) {
+    case LibCXXSimulator_None:
+      // Handle non-simulator cases.
+      if (isTargetIPhoneOS()) {
+        if (isIPhoneOSVersionLT(5, 0)) {
+          getDriver().Diag(clang::diag::err_drv_invalid_libcxx_deployment)
+            << "iOS 5.0";
+        }
+      } else {
+        if (isMacosxVersionLT(10, 7)) {
+          getDriver().Diag(clang::diag::err_drv_invalid_libcxx_deployment)
+            << "Mac OS X 10.7";
+        }
+      }
+      break;
+    case LibCXXSimulator_NotAvailable:
+      getDriver().Diag(clang::diag::err_drv_invalid_libcxx_deployment)
+        << "iOS 5.0";
+      break;
+    case LibCXXSimulator_Available:
+      break;
+    }
+  }
+
   return DAL;
 }
 
diff --git a/lib/Driver/ToolChains.h b/lib/Driver/ToolChains.h
index c9ff3a0473..dfcb253acd 100644
--- a/lib/Driver/ToolChains.h
+++ b/lib/Driver/ToolChains.h
@@ -66,6 +66,12 @@ private:
     ARCSimulator_NoARCRuntime
   } ARCRuntimeForSimulator;
 
+  mutable enum {
+    LibCXXSimulator_None,
+    LibCXXSimulator_NotAvailable,
+    LibCXXSimulator_Available
+  } LibCXXForSimulator;
+
 private:
   /// Whether we are targeting iPhoneOS target.
   mutable bool TargetIsIPhoneOS;