Index: cfe/trunk/lib/Driver/ToolChains/Linux.h
===================================================================
--- cfe/trunk/lib/Driver/ToolChains/Linux.h
+++ cfe/trunk/lib/Driver/ToolChains/Linux.h
@@ -37,6 +37,7 @@
                           llvm::opt::ArgStringList &CC1Args) const override;
   void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                            llvm::opt::ArgStringList &CC1Args) const override;
+  CXXStdlibType GetDefaultCXXStdlibType() const override;
   bool isPIEDefault() const override;
   bool IsMathErrnoDefault() const override;
   SanitizerMask getSupportedSanitizers() const override;
Index: cfe/trunk/lib/Driver/ToolChains/Linux.cpp
===================================================================
--- cfe/trunk/lib/Driver/ToolChains/Linux.cpp
+++ cfe/trunk/lib/Driver/ToolChains/Linux.cpp
@@ -436,6 +436,12 @@
   addPathIfExists(D, SysRoot + "/usr/lib", Paths);
 }
 
+ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const {
+  if (getTriple().isAndroid())
+    return ToolChain::CST_Libcxx;
+  return ToolChain::CST_Libstdcxx;
+}
+
 bool Linux::HasNativeLLVMSupport() const { return true; }
 
 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); }
Index: cfe/trunk/test/Driver/android-ndk-standalone.cpp
===================================================================
--- cfe/trunk/test/Driver/android-ndk-standalone.cpp
+++ cfe/trunk/test/Driver/android-ndk-standalone.cpp
@@ -2,21 +2,13 @@
 // toolchain.
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  %s
 // CHECK: {{.*}}clang{{.*}}" "-cc1"
 // CHECK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
-// CHECK-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK: "-internal-isystem" "{{.*}}/sysroot/usr/local/include"
 // CHECK: "-internal-isystem" "[[RESOURCE_DIR]]{{(/|\\\\)}}include"
 // CHECK: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/arm-linux-androideabi"
@@ -49,21 +41,47 @@
 // CHECK-14: "-L{{.*}}/sysroot/usr/lib/arm-linux-androideabi"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target armv7a-none-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -B%S/Inputs/basic_android_ndk_tree \
+// RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
+// RUN:   | FileCheck --check-prefix=CHECK-STDCXX %s
+// CHECK-STDCXX: {{.*}}clang{{.*}}" "-cc1"
+// CHECK-STDCXX: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-STDCXX: "-internal-isystem" "{{.*}}/include/c++/4.9"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
+// CHECK-STDCXX: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
+// CHECK-STDCXX-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
+// CHECK-STDCXX: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-STDCXX: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/armv7-a"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/thumb"
+// CHECK-STDCXX: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/armv7-a"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/thumb"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/armv7-a"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/thumb"
+// CHECK-STDCXX: "-L{{.*}}/sysroot/usr/lib/arm-linux-androideabi/21"
+// CHECK-STDCXX: "-L{{.*}}/sysroot/usr/lib/arm-linux-androideabi"
+// CHECK-STDCXX: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/arm-linux-androideabi/lib"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/armv7-a/thumb"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/armv7-a"
+// CHECK-STDCXX-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib/thumb"
+//
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target armv7a-none-linux-androideabi21 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-ARMV7 %s
 // CHECK-ARMV7: {{.*}}clang{{.*}}" "-cc1"
 // CHECK-ARMV7: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-ARMV7: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-ARMV7: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK-ARMV7-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-ARMV7: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-ARMV7: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-ARMV7: "-internal-isystem" "{{.*}}/sysroot/usr/local/include"
 // CHECK-ARMV7: "-internal-isystem" "[[RESOURCE_DIR]]{{(/|\\\\)}}include"
 // CHECK-ARMV7: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/arm-linux-androideabi"
@@ -89,19 +107,19 @@
 //
 // Other flags that can trigger armv7 mode.
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -march=armv7 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-ARMV7 %s
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -march=armv7a \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-ARMV7 %s
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -march=armv7-a \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
@@ -109,22 +127,14 @@
 //
 // ARM thumb mode.
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -mthumb \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-THUMB %s
 // CHECK-THUMB: {{.*}}clang{{.*}}" "-cc1"
 // CHECK-THUMB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7/thumb"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7/thumb"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7"
-// CHECK-THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-THUMB: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-THUMB: "-internal-isystem" "{{.*}}/sysroot/usr/local/include"
 // CHECK-THUMB: "-internal-isystem" "[[RESOURCE_DIR]]{{(/|\\\\)}}include"
 // CHECK-THUMB: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/arm-linux-androideabi"
@@ -151,22 +161,14 @@
 //
 // ARM V7 thumb mode.
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -march=armv7-a -mthumb \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-ARMV7THUMB %s
 // CHECK-ARMV7THUMB: {{.*}}clang{{.*}}" "-cc1"
 // CHECK-ARMV7THUMB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
-// CHECK-ARMV7THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-ARMV7THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a/thumb"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/armv7-a"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi/thumb"
-// CHECK-ARMV7THUMB-NOT: "-internal-isystem" "{{.*}}/include/c++/4.9/arm-linux-androideabi"
-// CHECK-ARMV7THUMB: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-ARMV7THUMB: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-ARMV7THUMB: "-internal-isystem" "{{.*}}/sysroot/usr/local/include"
 // CHECK-ARMV7THUMB: "-internal-isystem" "[[RESOURCE_DIR]]{{(/|\\\\)}}include"
 // CHECK-ARMV7THUMB: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/arm-linux-androideabi"
@@ -191,7 +193,7 @@
 // CHECK-ARMV7THUMB-NOT: "-L{{.*}}/lib/gcc/arm-linux-androideabi/4.9/../{{[^ ]*}}/lib"
 
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target arm-linux-androideabi21 \
 // RUN:     -march=armv7-a -mthumb \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
@@ -205,21 +207,19 @@
 
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target armv7a-none-linux-androideabi21 -stdlib=libstdc++ \
+// RUN:     -target armv7a-none-linux-androideabi21 \
 // RUN:     -mthumb \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck  --check-prefix=CHECK-ARMV7THUMB %s
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target aarch64-linux-android21 -stdlib=libstdc++ \
+// RUN:     -target aarch64-linux-android21 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-AARCH64 %s
 // CHECK-AARCH64: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-AARCH64: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-AARCH64: "-internal-isystem" "{{.*}}/include/c++/4.9/aarch64-linux-android"
-// CHECK-AARCH64: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-AARCH64: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-AARCH64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/aarch64-linux-android"
 // CHECK-AARCH64: "-internal-externc-isystem" "{{.*}}/sysroot/include"
 // CHECK-AARCH64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include"
@@ -230,14 +230,12 @@
 // CHECK-AARCH64: "-L{{.*}}/lib/gcc/aarch64-linux-android/4.9/../../../../aarch64-linux-android/lib"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm64-linux-android21 -stdlib=libstdc++ \
+// RUN:     -target arm64-linux-android21 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-ARM64 %s
 // CHECK-ARM64: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-ARM64: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-ARM64: "-internal-isystem" "{{.*}}/include/c++/4.9/aarch64-linux-android"
-// CHECK-ARM64: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-ARM64: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-ARM64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/aarch64-linux-android"
 // CHECK-ARM64: "-internal-externc-isystem" "{{.*}}/sysroot/include"
 // CHECK-ARM64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include"
@@ -249,14 +247,12 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target mipsel-linux-android21 \
-// RUN:     -mips32 -stdlib=libstdc++ \
+// RUN:     -mips32 \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPS %s
 // CHECK-MIPS: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-MIPS: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-MIPS: "-internal-isystem" "{{.*}}/include/c++/4.9/mipsel-linux-android"
-// CHECK-MIPS: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-MIPS: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-MIPS: "-internal-externc-isystem" "{{.*}}/sysroot/include"
 // CHECK-MIPS: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include"
 // CHECK-MIPS: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
@@ -267,14 +263,11 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target i686-linux-android21 \
-// RUN:     -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-I686 %s
 // CHECK-I686: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-I686: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-I686: "-internal-isystem" "{{.*}}/include/c++/4.9/i686-linux-android"
-// CHECK-I686: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-I686: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-I686: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/i686-linux-android"
 // CHECK-I686: "-internal-externc-isystem" "{{.*}}/sysroot/include"
 // CHECK-I686: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include"
@@ -286,14 +279,11 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target x86_64-linux-android21 \
-// RUN:     -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_ndk_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_ndk_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-X86_64 %s
 // CHECK-X86_64: {{.*}}clang{{.*}}" "-cc1"
-// CHECK-X86_64: "-internal-isystem" "{{.*}}/include/c++/4.9"
-// CHECK-X86_64: "-internal-isystem" "{{.*}}/include/c++/4.9/x86_64-linux-android"
-// CHECK-X86_64: "-internal-isystem" "{{.*}}/include/c++/4.9/backward"
+// CHECK-X86_64: "-internal-isystem" "{{.*}}/include/c++/v1"
 // CHECK-X86_64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include/x86_64-linux-android"
 // CHECK-X86_64: "-internal-externc-isystem" "{{.*}}/sysroot/include"
 // CHECK-X86_64: "-internal-externc-isystem" "{{.*}}/sysroot/usr/include"