Re: [PATCH] D15920: [CMake] Add option to switch default C++ stdlib

Jonas Hahnfeld via cfe-commits Wed, 10 Feb 2016 04:08:01 -0800

Hahnfeld updated this revision to Diff 47441.
Hahnfeld added a comment.

Address reviewers' comments:


- check for valid `CLANG_DEFAULT_CXX_STDLIB`
- generalize for `Darwin` and `Bitrig` by introducing `GetDefaultCXXStdlibType`
- fallback to `CLANG_DEFAULT_CXX_STDLIB` if user choice is incorrect


http://reviews.llvm.org/D15920

Files:
  CMakeLists.txt
  include/clang/Config/config.h.cmake
  include/clang/Config/config.h.in
  include/clang/Driver/ToolChain.h
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  test/Driver/android-standalone.cpp
  test/Driver/darwin-iphone-defaults.m
  test/Driver/darwin-objc-gc.m
  test/Driver/darwin-sanitizer-ld.c
  test/Driver/gcc-toolchain.cpp
  test/Driver/linux-header-search.cpp
  test/Driver/mips-cs.cpp
  test/Driver/mips-fsf.cpp
  test/Driver/mips-img.cpp
  test/Driver/sanitizer-ld.c
  test/Driver/windows-cross.c
  unittests/libclang/LibclangTest.cpp

Index: unittests/libclang/LibclangTest.cpp
===================================================================
--- unittests/libclang/LibclangTest.cpp
+++ unittests/libclang/LibclangTest.cpp
@@ -485,7 +485,7 @@
   WriteFile(Clang, "");
 
   const char *Argv[] = {Clang.c_str(), "-target", "arm-linux-gnueabi",
-                        "--gcc-toolchain="};
+                        "-stdlib=libstdc++", "--gcc-toolchain="};
 
   EXPECT_EQ(CXError_Success,
             clang_parseTranslationUnit2FullArgv(Index, Filename.c_str(), Argv,
Index: test/Driver/windows-cross.c
===================================================================
--- test/Driver/windows-cross.c
+++ test/Driver/windows-cross.c
@@ -1,9 +1,9 @@
-// RUN: %clang -### -target armv7-windows-itanium --sysroot %S/Inputs/Windows/ARM/8.1 -B %S/Inputs/Windows/ARM/8.1/usr/bin -o /dev/null %s 2>&1 \
+// RUN: %clang -### -target armv7-windows-itanium --sysroot %S/Inputs/Windows/ARM/8.1 -B %S/Inputs/Windows/ARM/8.1/usr/bin -stdlib=libstdc++ -o /dev/null %s 2>&1 \
 // RUN:   | FileCheck %s --check-prefix CHECK-BASIC
 
 // CHECK-BASIC: armv7-windows-itanium-ld" "--sysroot={{.*}}/Inputs/Windows/ARM/8.1" "-m" "thumb2pe" "-Bdynamic" "--entry" "mainCRTStartup" "--allow-multiple-definition" "-o" "{{[^"]*}}" "{{.*}}/Inputs/Windows/ARM/8.1/usr/lib/crtbegin.obj" "-L{{.*}}/Inputs/Windows/ARM/8.1/usr/lib" "-L{{.*}}/Inputs/Windows/ARM/8.1/usr/lib/gcc" "{{.*}}.o" "-lmsvcrt" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed"
 
-// RUN: %clang -### -target armv7-windows-itanium --sysroot %s/Inputs/Windows/ARM/8.1 -B %S/Inputs/Windows/ARM/8.1/usr/bin -rtlib=compiler-rt -o /dev/null %s 2>&1 \
+// RUN: %clang -### -target armv7-windows-itanium --sysroot %s/Inputs/Windows/ARM/8.1 -B %S/Inputs/Windows/ARM/8.1/usr/bin -rtlib=compiler-rt -stdlib=libstdc++ -o /dev/null %s 2>&1 \
 // RUN:   | FileCheck %s --check-prefix CHECK-RTLIB
 
 // CHECK-RTLIB: armv7-windows-itanium-ld" "--sysroot={{.*}}/Inputs/Windows/ARM/8.1" "-m" "thumb2pe" "-Bdynamic" "--entry" "mainCRTStartup" "--allow-multiple-definition" "-o" "{{[^"]*}}" "{{.*}}/Inputs/Windows/ARM/8.1/usr/lib/crtbegin.obj" "-L{{.*}}/Inputs/Windows/ARM/8.1/usr/lib" "-L{{.*}}/Inputs/Windows/ARM/8.1/usr/lib/gcc" "{{.*}}.o" "-lmsvcrt" "{{.*[\\/]}}clang_rt.builtins-arm.lib"
@@ -33,7 +33,7 @@
 
 // CHECK-STANDALONE: armv7-windows-itanium-ld" "--sysroot={{.*}}/Inputs/Windows/ARM/8.1" "-m" "thumb2pe" "-shared" "-Bdynamic" "--enable-auto-image-base" "--entry" "_DllMainCRTStartup" "--allow-multiple-definition" "-o" "shared.dll" "--out-implib" "shared.lib" "{{.*}}.o"
 
-// RUN: %clang -### -target armv7-windows-itanium --sysroot %S/Inputs/Windows/ARM/8.1 -B %/Inputs/Windows/ARM/8.1/usr/bin -shared -o shared.dll -x c++ %s 2>&1 \
+// RUN: %clang -### -target armv7-windows-itanium --sysroot %S/Inputs/Windows/ARM/8.1 -B %/Inputs/Windows/ARM/8.1/usr/bin -stdlib=libstdc++ -shared -o shared.dll -x c++ %s 2>&1 \
 // RUN:    | FileCheck %s --check-prefix CHECK-LIBSTDCXX
 
 // CHECK-LIBSTDCXX:  "-internal-isystem" "{{.*}}/usr/include/c++" "-internal-isystem" "{{.*}}/usr/include/c++/armv7--windows-itanium" "-internal-isystem" "{{.*}}/usr/include/c++/backwards"
Index: test/Driver/sanitizer-ld.c
===================================================================
--- test/Driver/sanitizer-ld.c
+++ test/Driver/sanitizer-ld.c
@@ -76,7 +76,7 @@
 // CHECK-ASAN-FREEBSD-LDL-NOT: "-ldl"
 
 // RUN: %clangxx -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target i386-unknown-linux -fsanitize=address \
+// RUN:     -target i386-unknown-linux -stdlib=libstdc++ -fsanitize=address \
 // RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-CXX %s
@@ -93,8 +93,8 @@
 // CHECK-ASAN-LINUX-CXX: "-ldl"
 
 // RUN: %clang -no-canonical-prefixes %s -### -o /dev/null -fsanitize=address \
-// RUN:     -target i386-unknown-linux --sysroot=%S/Inputs/basic_linux_tree \
-// RUN:     -lstdc++ -static 2>&1 \
+// RUN:     -target i386-unknown-linux -stdlib=libstdc++ \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree -lstdc++ -static 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-CXX-STATIC %s
 //
 // CHECK-ASAN-LINUX-CXX-STATIC: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
@@ -152,7 +152,8 @@
 // CHECK-ASAN-ANDROID-SHARED-NOT: "-lpthread"
 
 // RUN: %clangxx -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target x86_64-unknown-linux -lstdc++ -fsanitize=thread \
+// RUN:     -target x86_64-unknown-linux -stdlib=libstdc++ -lstdc++ \
+// RUN:     -fsanitize=thread \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-TSAN-LINUX-CXX %s
@@ -170,7 +171,8 @@
 // CHECK-TSAN-LINUX-CXX: "-ldl"
 
 // RUN: %clangxx -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target x86_64-unknown-linux -lstdc++ -fsanitize=memory \
+// RUN:     -target x86_64-unknown-linux -stdlib=libstdc++ -lstdc++ \
+// RUN:     -fsanitize=memory \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-MSAN-LINUX-CXX %s
@@ -209,7 +211,7 @@
 // CHECK-UBSAN-LINUX-LINK-CXX-NOT: "-lstdc++"
 
 // RUN: %clangxx -fsanitize=undefined %s -### -o %t.o 2>&1 \
-// RUN:     -target i386-unknown-linux \
+// RUN:     -target i386-unknown-linux -stdlib=libstdc++ \
 // RUN:     -resource-dir=%S/Inputs/resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-UBSAN-LINUX-CXX %s
@@ -234,7 +236,7 @@
 // CHECK-ASAN-UBSAN-LINUX: "-lpthread"
 
 // RUN: %clangxx -fsanitize=address,undefined %s -### -o %t.o 2>&1 \
-// RUN:     -target i386-unknown-linux \
+// RUN:     -target i386-unknown-linux -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-UBSAN-LINUX-CXX %s
 // CHECK-ASAN-UBSAN-LINUX-CXX: "{{.*}}ld{{(.exe)?}}"
@@ -327,7 +329,7 @@
 
 // RUN: %clangxx -fsanitize=address %s -### -o %t.o 2>&1 \
 // RUN:     -mmacosx-version-min=10.6 \
-// RUN:     -target x86_64-apple-darwin13.4.0 \
+// RUN:     -target x86_64-apple-darwin13.4.0 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-DARWIN106-CXX %s
 // CHECK-ASAN-DARWIN106-CXX: "{{.*}}ld{{(.exe)?}}"
Index: test/Driver/mips-img.cpp
===================================================================
--- test/Driver/mips-img.cpp
+++ test/Driver/mips-img.cpp
@@ -3,7 +3,7 @@
 // = Big-endian, mips32r6
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-img-linux-gnu -mips32r6 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-32R6 %s
 // CHECK-BE-32R6: "-internal-isystem"
 // CHECK-BE-32R6: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
@@ -30,7 +30,7 @@
 // = Little-endian, mips32r6
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-img-linux-gnu -mips32r6 -EL \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-LE-32R6 %s
 // CHECK-LE-32R6: "-internal-isystem"
 // CHECK-LE-32R6: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
@@ -57,7 +57,7 @@
 // = Big-endian, mips64r6, N32
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-img-linux-gnu -mips64r6 -mabi=n32 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-64R6-N32 %s
 // CHECK-BE-64R6-N32: "-internal-isystem"
 // CHECK-BE-64R6-N32: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
@@ -84,7 +84,7 @@
 // = Little-endian, mips64r6, N32
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-img-linux-gnu -mips64r6 -EL -mabi=n32 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-LE-64R6-N32 %s
 // CHECK-LE-64R6-N32: "-internal-isystem"
 // CHECK-LE-64R6-N32: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
@@ -111,7 +111,7 @@
 // = Big-endian, mips64r6, N64
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-img-linux-gnu -mips64r6 -mabi=64 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-64R6-N64 %s
 // CHECK-BE-64R6-N64: "-internal-isystem"
 // CHECK-BE-64R6-N64: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
@@ -138,7 +138,7 @@
 // = Little-endian, mips64r6, N64
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-img-linux-gnu -mips64r6 -EL -mabi=64 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_img_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_img_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-LE-64R6-N64 %s
 // CHECK-LE-64R6-N64: "-internal-isystem"
 // CHECK-LE-64R6-N64: "[[TC:[^"]+/lib/gcc/mips-img-linux-gnu/4.9.0]]/../../../../mips-img-linux-gnu/include/c++/4.9.0"
Index: test/Driver/mips-fsf.cpp
===================================================================
--- test/Driver/mips-fsf.cpp
+++ test/Driver/mips-fsf.cpp
@@ -3,7 +3,7 @@
 // = Big-endian, mips32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32 %s
 // CHECK-BE-HF-32: "-internal-isystem"
 // CHECK-BE-HF-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -30,7 +30,7 @@
 // = Big-endian, mips32, hard float, fp64
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-32 %s
 // CHECK-BE-HF64-32: "-internal-isystem"
 // CHECK-BE-HF64-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -57,7 +57,7 @@
 // = Big-endian, mips32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-32 %s
 // CHECK-BE-SF-32: "-internal-isystem"
 // CHECK-BE-SF-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -84,7 +84,7 @@
 // = Big-endian, mips16 / mips32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mips16 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-16 %s
 // CHECK-BE-HF-16: "-internal-isystem"
 // CHECK-BE-HF-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -111,7 +111,7 @@
 // = Big-endian, mips16 / mips32, hard float, fp64
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mips16 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-16 %s
 // CHECK-BE-HF64-16: "-internal-isystem"
 // CHECK-BE-HF64-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -138,7 +138,7 @@
 // = Big-endian, mips16 / mips32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mips16 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-16 %s
 // CHECK-BE-SF-16: "-internal-isystem"
 // CHECK-BE-SF-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -165,7 +165,7 @@
 // = Big-endian, mips32 / mips16, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mips16 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-16 %s
 // CHECK-BE-NAN-16: "-internal-isystem"
 // CHECK-BE-NAN-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -192,7 +192,7 @@
 // = Big-endian, mips32 / mips16, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mips16 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-16 %s
 // CHECK-BE-NAN64-16: "-internal-isystem"
 // CHECK-BE-NAN64-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -219,7 +219,7 @@
 // = Big-endian, mips32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-32 %s
 // CHECK-BE-NAN-32: "-internal-isystem"
 // CHECK-BE-NAN-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -246,7 +246,7 @@
 // = Big-endian, mips32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-32 %s
 // CHECK-BE-NAN64-32: "-internal-isystem"
 // CHECK-BE-NAN64-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -273,7 +273,7 @@
 // = Big-endian, mips32r2, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32R2 %s
 // CHECK-BE-HF-32R2: "-internal-isystem"
 // CHECK-BE-HF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -300,7 +300,7 @@
 // = Big-endian, mips32r2, hard float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mhard-float -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-HF-32R2 %s
 // CHECK-BE-UC-HF-32R2: "-internal-isystem"
 // CHECK-BE-UC-HF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -327,7 +327,7 @@
 // = Big-endian, mips32r2, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-32R2 %s
 // CHECK-BE-HF64-32R2: "-internal-isystem"
 // CHECK-BE-HF64-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -354,7 +354,7 @@
 // = Big-endian, mips32r2, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-32R2 %s
 // CHECK-BE-SF-32R2: "-internal-isystem"
 // CHECK-BE-SF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -381,7 +381,7 @@
 // = Big-endian, mips32r2, soft float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -msoft-float -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-SF-32R2 %s
 // CHECK-BE-UC-SF-32R2: "-internal-isystem"
 // CHECK-BE-UC-SF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -408,7 +408,7 @@
 // = Big-endian, mips32r2 / mips16, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mips16 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-16R2 %s
 // CHECK-BE-HF-16R2: "-internal-isystem"
 // CHECK-BE-HF-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -435,7 +435,7 @@
 // = Big-endian, mips32r2 / mips16, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mips16 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-16R2 %s
 // CHECK-BE-HF64-16R2: "-internal-isystem"
 // CHECK-BE-HF64-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -462,7 +462,7 @@
 // = Big-endian, mips32r2 / mips16, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mips16 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-16R2 %s
 // CHECK-BE-SF-16R2: "-internal-isystem"
 // CHECK-BE-SF-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -489,7 +489,7 @@
 // = Big-endian, mips32r2 / mips16, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mips16 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-16R2 %s
 // CHECK-BE-NAN-16R2: "-internal-isystem"
 // CHECK-BE-NAN-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -516,7 +516,7 @@
 // = Big-endian, mips32r2 / mips16, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mips16 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-16R2 %s
 // CHECK-BE-NAN64-16R2: "-internal-isystem"
 // CHECK-BE-NAN64-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -543,7 +543,7 @@
 // = Big-endian, mips32r2, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-32R2 %s
 // CHECK-BE-NAN-32R2: "-internal-isystem"
 // CHECK-BE-NAN-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -570,7 +570,7 @@
 // = Big-endian, mips32r2, nan2008, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mnan=2008 -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-NAN-32R2 %s
 // CHECK-BE-UC-NAN-32R2: "-internal-isystem"
 // CHECK-BE-UC-NAN-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -597,7 +597,7 @@
 // = Big-endian, mips32r2, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r2 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-32R2 %s
 // CHECK-BE-NAN64-32R2: "-internal-isystem"
 // CHECK-BE-NAN64-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -624,7 +624,7 @@
 // = Big-endian, default (mips32r2), fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-32R2-DEF %s
 // CHECK-BE-NAN64-32R2-DEF: "-internal-isystem"
 // CHECK-BE-NAN64-32R2-DEF: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -651,7 +651,7 @@
 // = Big-endian, micromips, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-MM %s
 // CHECK-BE-HF-MM: "-internal-isystem"
 // CHECK-BE-HF-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -678,7 +678,7 @@
 // = Big-endian, micromips, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-MM %s
 // CHECK-BE-HF64-MM: "-internal-isystem"
 // CHECK-BE-HF64-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -705,7 +705,7 @@
 // = Big-endian, micromips, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-MM %s
 // CHECK-BE-SF-MM: "-internal-isystem"
 // CHECK-BE-SF-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -732,7 +732,7 @@
 // = Big-endian, micromips, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-MM %s
 // CHECK-BE-NAN-MM: "-internal-isystem"
 // CHECK-BE-NAN-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -759,7 +759,7 @@
 // = Big-endian, micromips, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-MM %s
 // CHECK-BE-NAN64-MM: "-internal-isystem"
 // CHECK-BE-NAN64-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -786,7 +786,7 @@
 // = Big-endian, mips64, ABI n32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=n32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64-N32 %s
 // CHECK-BE-HF-64-N32: "-internal-isystem"
 // CHECK-BE-HF-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -813,7 +813,7 @@
 // = Big-endian, mips64, ABI n32, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=n32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-64-N32 %s
 // CHECK-BE-HF64-64-N32: "-internal-isystem"
 // CHECK-BE-HF64-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -840,7 +840,7 @@
 // = Big-endian, mips64, ABI n32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=n32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-64-N32 %s
 // CHECK-BE-SF-64-N32: "-internal-isystem"
 // CHECK-BE-SF-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -867,7 +867,7 @@
 // = Big-endian, mips64, ABI n32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=n32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-64-N32 %s
 // CHECK-BE-NAN-64-N32: "-internal-isystem"
 // CHECK-BE-NAN-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -894,7 +894,7 @@
 // = Big-endian, mips64, ABI n32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=n32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-64-N32 %s
 // CHECK-BE-NAN64-64-N32: "-internal-isystem"
 // CHECK-BE-NAN64-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -921,7 +921,7 @@
 // = Big-endian, mips64, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64-64 %s
 // CHECK-BE-HF-64-64: "-internal-isystem"
 // CHECK-BE-HF-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -948,7 +948,7 @@
 // = Big-endian, mips64, ABI 64, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=64 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-64-64 %s
 // CHECK-BE-HF64-64-64: "-internal-isystem"
 // CHECK-BE-HF64-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -975,7 +975,7 @@
 // = Big-endian, mips64, ABI 64, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=64 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-64-64 %s
 // CHECK-BE-SF-64-64: "-internal-isystem"
 // CHECK-BE-SF-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1002,7 +1002,7 @@
 // = Big-endian, mips64, ABI 64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-64-64 %s
 // CHECK-BE-NAN-64-64: "-internal-isystem"
 // CHECK-BE-NAN-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1029,7 +1029,7 @@
 // = Big-endian, mips64, ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64 -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-64-64 %s
 // CHECK-BE-NAN64-64-64: "-internal-isystem"
 // CHECK-BE-NAN64-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1056,7 +1056,7 @@
 // = Big-endian, mips64r2, ABI n32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=n32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R2-N32 %s
 // CHECK-BE-HF-64R2-N32: "-internal-isystem"
 // CHECK-BE-HF-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1083,7 +1083,7 @@
 // = Big-endian, mips64r2, ABI n32, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=n32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-64R2-N32 %s
 // CHECK-BE-HF64-64R2-N32: "-internal-isystem"
 // CHECK-BE-HF64-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1110,7 +1110,7 @@
 // = Big-endian, mips64r2, ABI n32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=n32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-64R2-N32 %s
 // CHECK-BE-SF-64R2-N32: "-internal-isystem"
 // CHECK-BE-SF-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1137,7 +1137,7 @@
 // = Big-endian, mips64r2, ABI n32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=n32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-64R2-N32 %s
 // CHECK-BE-NAN-64R2-N32: "-internal-isystem"
 // CHECK-BE-NAN-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1164,7 +1164,7 @@
 // = Big-endian, mips64r2, ABI n32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=n32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-64R2-N32 %s
 // CHECK-BE-NAN64-64R2-N32: "-internal-isystem"
 // CHECK-BE-NAN64-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1191,7 +1191,7 @@
 // = Big-endian, mips64r2, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R2-64 %s
 // CHECK-BE-HF-64R2-64: "-internal-isystem"
 // CHECK-BE-HF-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1218,7 +1218,7 @@
 // = Big-endian, mips64r2, ABI 64, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=64 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF64-64R2-64 %s
 // CHECK-BE-HF64-64R2-64: "-internal-isystem"
 // CHECK-BE-HF64-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1245,7 +1245,7 @@
 // = Big-endian, mips64r2, ABI 64, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=64 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-64R2-64 %s
 // CHECK-BE-SF-64R2-64: "-internal-isystem"
 // CHECK-BE-SF-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1272,7 +1272,7 @@
 // = Big-endian, mips64r2, ABI 64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN-64R2-64 %s
 // CHECK-BE-NAN-64R2-64: "-internal-isystem"
 // CHECK-BE-NAN-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1299,7 +1299,7 @@
 // = Big-endian, mips64r2, ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r2 -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-64R2-64 %s
 // CHECK-BE-NAN64-64R2-64: "-internal-isystem"
 // CHECK-BE-NAN64-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1326,7 +1326,7 @@
 // = Big-endian, default (mips64r2), ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-NAN64-64R2-64-DEF %s
 // CHECK-BE-NAN64-64R2-64-DEF: "-internal-isystem"
 // CHECK-BE-NAN64-64R2-64-DEF: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1353,7 +1353,7 @@
 // = Little-endian, mips32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-32 %s
 // CHECK-EL-HF-32: "-internal-isystem"
 // CHECK-EL-HF-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1380,7 +1380,7 @@
 // = Little-endian, mips32, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-32 %s
 // CHECK-EL-HF64-32: "-internal-isystem"
 // CHECK-EL-HF64-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1407,7 +1407,7 @@
 // = Little-endian, mips32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-32 %s
 // CHECK-EL-SF-32: "-internal-isystem"
 // CHECK-EL-SF-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1434,7 +1434,7 @@
 // = Little-endian, mips32 / mips16, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mips16 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-16 %s
 // CHECK-EL-HF-16: "-internal-isystem"
 // CHECK-EL-HF-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1461,7 +1461,7 @@
 // = Little-endian, mips32 / mips16, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mips16 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-16 %s
 // CHECK-EL-HF64-16: "-internal-isystem"
 // CHECK-EL-HF64-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1488,7 +1488,7 @@
 // = Little-endian, mips32 / mips16, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mips16 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-16 %s
 // CHECK-EL-SF-16: "-internal-isystem"
 // CHECK-EL-SF-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1515,7 +1515,7 @@
 // = Little-endian, mips32 / mips16, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mips16 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-16 %s
 // CHECK-EL-NAN-16: "-internal-isystem"
 // CHECK-EL-NAN-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1542,7 +1542,7 @@
 // = Little-endian, mips32 / mips16, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mips16 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-16 %s
 // CHECK-EL-NAN64-16: "-internal-isystem"
 // CHECK-EL-NAN64-16: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1569,7 +1569,7 @@
 // = Little-endian, mips32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-32 %s
 // CHECK-EL-NAN-32: "-internal-isystem"
 // CHECK-EL-NAN-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1596,7 +1596,7 @@
 // = Little-endian, mips32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-32 %s
 // CHECK-EL-NAN64-32: "-internal-isystem"
 // CHECK-EL-NAN64-32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1623,7 +1623,7 @@
 // = Little-endian, mips32r2, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-32R2 %s
 // CHECK-EL-HF-32R2: "-internal-isystem"
 // CHECK-EL-HF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1650,7 +1650,7 @@
 // = Little-endian, mips32r2, hard float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mhard-float -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-HF-32R2 %s
 // CHECK-EL-UC-HF-32R2: "-internal-isystem"
 // CHECK-EL-UC-HF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1677,7 +1677,7 @@
 // = Little-endian, mips32r2, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-32R2 %s
 // CHECK-EL-HF64-32R2: "-internal-isystem"
 // CHECK-EL-HF64-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1704,7 +1704,7 @@
 // = Little-endian, mips32r2, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-32R2 %s
 // CHECK-EL-SF-32R2: "-internal-isystem"
 // CHECK-EL-SF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1731,7 +1731,7 @@
 // = Little-endian, mips32r2, soft float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -msoft-float -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-SF-32R2 %s
 // CHECK-EL-UC-SF-32R2: "-internal-isystem"
 // CHECK-EL-UC-SF-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1758,7 +1758,7 @@
 // = Little-endian, mips32r2 / mips16, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mips16 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-16R2 %s
 // CHECK-EL-HF-16R2: "-internal-isystem"
 // CHECK-EL-HF-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1785,7 +1785,7 @@
 // = Little-endian, mips32r2 / mips16, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mips16 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-16R2 %s
 // CHECK-EL-HF64-16R2: "-internal-isystem"
 // CHECK-EL-HF64-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1812,7 +1812,7 @@
 // = Little-endian, mips32r2 / mips16, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mips16 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-16R2 %s
 // CHECK-EL-SF-16R2: "-internal-isystem"
 // CHECK-EL-SF-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1839,7 +1839,7 @@
 // = Little-endian, mips32r2 / mips16, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mips16 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-16R2 %s
 // CHECK-EL-NAN-16R2: "-internal-isystem"
 // CHECK-EL-NAN-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1866,7 +1866,7 @@
 // = Little-endian, mips32r2 / mips16, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mips16 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-16R2 %s
 // CHECK-EL-NAN64-16R2: "-internal-isystem"
 // CHECK-EL-NAN64-16R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1893,7 +1893,7 @@
 // = Little-endian, mips32r2, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-32R2 %s
 // CHECK-EL-NAN-32R2: "-internal-isystem"
 // CHECK-EL-NAN-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1920,7 +1920,7 @@
 // = Little-endian, mips32r2, nan2008, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mnan=2008 -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-NAN-32R2 %s
 // CHECK-EL-UC-NAN-32R2: "-internal-isystem"
 // CHECK-EL-UC-NAN-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1947,7 +1947,7 @@
 // = Little-endian, mips32r2, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips32r2 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-32R2 %s
 // CHECK-EL-NAN64-32R2: "-internal-isystem"
 // CHECK-EL-NAN64-32R2: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -1974,7 +1974,7 @@
 // = Little-endian, default (mips32r2), fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-32R2-DEF %s
 // CHECK-EL-NAN64-32R2-DEF: "-internal-isystem"
 // CHECK-EL-NAN64-32R2-DEF: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2001,7 +2001,7 @@
 // = Little-endian, micromips, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-MM %s
 // CHECK-EL-HF-MM: "-internal-isystem"
 // CHECK-EL-HF-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2028,7 +2028,7 @@
 // = Little-endian, micromips, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-MM %s
 // CHECK-EL-HF64-MM: "-internal-isystem"
 // CHECK-EL-HF64-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2055,7 +2055,7 @@
 // = Little-endian, micromips, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-MM %s
 // CHECK-EL-SF-MM: "-internal-isystem"
 // CHECK-EL-SF-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2082,7 +2082,7 @@
 // = Little-endian, micromips, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-MM %s
 // CHECK-EL-NAN-MM: "-internal-isystem"
 // CHECK-EL-NAN-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2109,7 +2109,7 @@
 // = Little-endian, micromips, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-MM %s
 // CHECK-EL-NAN64-MM: "-internal-isystem"
 // CHECK-EL-NAN64-MM: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2136,7 +2136,7 @@
 // = Little-endian, mips64, ABI n32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=n32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-64-N32 %s
 // CHECK-EL-HF-64-N32: "-internal-isystem"
 // CHECK-EL-HF-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2163,7 +2163,7 @@
 // = Little-endian, mips64, ABI n32, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=n32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-64-N32 %s
 // CHECK-EL-HF64-64-N32: "-internal-isystem"
 // CHECK-EL-HF64-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2190,7 +2190,7 @@
 // = Little-endian, mips64, ABI n32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=n32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-64-N32 %s
 // CHECK-EL-SF-64-N32: "-internal-isystem"
 // CHECK-EL-SF-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2217,7 +2217,7 @@
 // = Little-endian, mips64, ABI n32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=n32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-64-N32 %s
 // CHECK-EL-NAN-64-N32: "-internal-isystem"
 // CHECK-EL-NAN-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2244,7 +2244,7 @@
 // = Little-endian, mips64, ABI n32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=n32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-64-N32 %s
 // CHECK-EL-NAN64-64-N32: "-internal-isystem"
 // CHECK-EL-NAN64-64-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2271,7 +2271,7 @@
 // = Little-endian, mips64, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-64-64 %s
 // CHECK-EL-HF-64-64: "-internal-isystem"
 // CHECK-EL-HF-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2298,7 +2298,7 @@
 // = Little-endian, mips64, ABI 64, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=64 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-64-64 %s
 // CHECK-EL-HF64-64-64: "-internal-isystem"
 // CHECK-EL-HF64-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2325,7 +2325,7 @@
 // = Little-endian, mips64, ABI 64, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=64 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-64-64 %s
 // CHECK-EL-SF-64-64: "-internal-isystem"
 // CHECK-EL-SF-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2352,7 +2352,7 @@
 // = Little-endian, mips64, ABI 64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-64-64 %s
 // CHECK-EL-NAN-64-64: "-internal-isystem"
 // CHECK-EL-NAN-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2379,7 +2379,7 @@
 // = Little-endian, mips64, ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64 -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-64-64 %s
 // CHECK-EL-NAN64-64-64: "-internal-isystem"
 // CHECK-EL-NAN64-64-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2406,7 +2406,7 @@
 // = Little-endian, mips64r2, ABI n32, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=n32 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-64R2-N32 %s
 // CHECK-EL-HF-64R2-N32: "-internal-isystem"
 // CHECK-EL-HF-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2433,7 +2433,7 @@
 // = Little-endian, mips64r2, ABI n32, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=n32 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-64R2-N32 %s
 // CHECK-EL-HF64-64R2-N32: "-internal-isystem"
 // CHECK-EL-HF64-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2460,7 +2460,7 @@
 // = Little-endian, mips64r2, ABI n32, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=n32 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-64R2-N32 %s
 // CHECK-EL-SF-64R2-N32: "-internal-isystem"
 // CHECK-EL-SF-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2487,7 +2487,7 @@
 // = Little-endian, mips64r2, ABI n32, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=n32 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-64R2-N32 %s
 // CHECK-EL-NAN-64R2-N32: "-internal-isystem"
 // CHECK-EL-NAN-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2514,7 +2514,7 @@
 // = Little-endian, mips64r2, ABI n32, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=n32 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-64R2-N32 %s
 // CHECK-EL-NAN64-64R2-N32: "-internal-isystem"
 // CHECK-EL-NAN64-64R2-N32: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2541,7 +2541,7 @@
 // = Little-endian, mips64r2, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-64R2-64 %s
 // CHECK-EL-HF-64R2-64: "-internal-isystem"
 // CHECK-EL-HF-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2568,7 +2568,7 @@
 // = Little-endian, mips64r2, ABI 64, fp64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=64 -mfp64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF64-64R2-64 %s
 // CHECK-EL-HF64-64R2-64: "-internal-isystem"
 // CHECK-EL-HF64-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2595,7 +2595,7 @@
 // = Little-endian, mips64r2, ABI 64, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=64 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-64R2-64 %s
 // CHECK-EL-SF-64R2-64: "-internal-isystem"
 // CHECK-EL-SF-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2622,7 +2622,7 @@
 // = Little-endian, mips64r2, ABI 64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN-64R2-64 %s
 // CHECK-EL-NAN-64R2-64: "-internal-isystem"
 // CHECK-EL-NAN-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2649,7 +2649,7 @@
 // = Little-endian, mips64r2, ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mips64r2 -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-64R2-64 %s
 // CHECK-EL-NAN64-64R2-64: "-internal-isystem"
 // CHECK-EL-NAN64-64R2-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2676,7 +2676,7 @@
 // = Little-endian, default (mips64r2), ABI 64, fp64, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -mabi=64 -mfp64 -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-NAN64-64R2-64-DEF %s
 // CHECK-EL-NAN64-64R2-64-DEF: "-internal-isystem"
 // CHECK-EL-NAN64-64R2-64-DEF: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2705,7 +2705,7 @@
 // = Big-endian, mips32r3, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r3 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32R3 %s
 // CHECK-BE-HF-32R3: "-internal-isystem"
 // CHECK-BE-HF-32R3: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2732,7 +2732,7 @@
 // = Big-endian, mips32r5, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips32r5 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32R5 %s
 // CHECK-BE-HF-32R5: "-internal-isystem"
 // CHECK-BE-HF-32R5: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2759,7 +2759,7 @@
 // = Big-endian, mips64r3, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r3 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R3-64 %s
 // CHECK-BE-HF-64R3-64: "-internal-isystem"
 // CHECK-BE-HF-64R3-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
@@ -2786,7 +2786,7 @@
 // = Big-endian, mips64r5, ABI 64, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -mips64r5 -mabi=64 -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_fsf_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_fsf_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64R5-64 %s
 // CHECK-BE-HF-64R5-64: "-internal-isystem"
 // CHECK-BE-HF-64R5-64: "[[TC:[^"]+/lib/gcc/mips-mti-linux-gnu/4.9.0]]/../../../../mips-mti-linux-gnu/include/c++/4.9.0"
Index: test/Driver/mips-cs.cpp
===================================================================
--- test/Driver/mips-cs.cpp
+++ test/Driver/mips-cs.cpp
@@ -3,7 +3,7 @@
 // = Big-endian, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-32 %s
 // CHECK-BE-HF-32: "-internal-isystem"
 // CHECK-BE-HF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -31,7 +31,7 @@
 // = Big-endian, hard float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-HF-32 %s
 // CHECK-BE-UC-HF-32: "-internal-isystem"
 // CHECK-BE-UC-HF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -60,7 +60,7 @@
 // = Big-endian, hard float, mips16
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mips16 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-16 %s
 // CHECK-BE-HF-16: "-internal-isystem"
 // CHECK-BE-HF-16: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -89,7 +89,7 @@
 // = Big-endian, hard float, mmicromips
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mmicromips \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-MICRO %s
 // CHECK-BE-HF-MICRO: "-internal-isystem"
 // CHECK-BE-HF-MICRO: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -118,7 +118,7 @@
 // = Big-endian, hard float, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-NAN %s
 // CHECK-BE-HF-NAN: "-internal-isystem"
 // CHECK-BE-HF-NAN: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -147,7 +147,7 @@
 // = Big-endian, hard float, uclibc, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -muclibc -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-HF-NAN %s
 // CHECK-BE-UC-HF-NAN: "-internal-isystem"
 // CHECK-BE-UC-HF-NAN: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -176,7 +176,7 @@
 // = Big-endian, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-32 %s
 // CHECK-BE-SF-32: "-internal-isystem"
 // CHECK-BE-SF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -205,7 +205,7 @@
 // = Big-endian, soft float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -muclibc -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-UC-SF-32 %s
 // CHECK-BE-UC-SF-32: "-internal-isystem"
 // CHECK-BE-UC-SF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -234,7 +234,7 @@
 // = Big-endian, soft float, mips16
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -msoft-float -mips16 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-16 %s
 // CHECK-BE-SF-16: "-internal-isystem"
 // CHECK-BE-SF-16: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -263,7 +263,7 @@
 // = Big-endian, soft float, micromips
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips-linux-gnu -msoft-float -mmicromips \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-MICRO %s
 // CHECK-BE-SF-MICRO: "-internal-isystem"
 // CHECK-BE-SF-MICRO: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -292,7 +292,7 @@
 // = Big-endian, hard float, 64-bit
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-HF-64 %s
 // CHECK-BE-HF-64: "-internal-isystem"
 // CHECK-BE-HF-64: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -321,7 +321,7 @@
 // = Big-endian, soft float, 64-bit
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnu -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-BE-SF-64 %s
 // CHECK-BE-SF-64: "-internal-isystem"
 // CHECK-BE-SF-64: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -350,7 +350,7 @@
 // = Little-endian, hard float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mhard-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-32 %s
 // CHECK-EL-HF-32: "-internal-isystem"
 // CHECK-EL-HF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -379,7 +379,7 @@
 // = Little-endian, hard float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mhard-float -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-HF-32 %s
 // CHECK-EL-UC-HF-32: "-internal-isystem"
 // CHECK-EL-UC-HF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -408,7 +408,7 @@
 // = Little-endian, hard float, mips16
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips16 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-16 %s
 // CHECK-EL-HF-16: "-internal-isystem"
 // CHECK-EL-HF-16: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -437,7 +437,7 @@
 // = Little-endian, hard float, micromips
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-MICRO %s
 // CHECK-EL-HF-MICRO: "-internal-isystem"
 // CHECK-EL-HF-MICRO: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -466,7 +466,7 @@
 // = Little-endian, hard float, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-NAN %s
 // CHECK-EL-HF-NAN: "-internal-isystem"
 // CHECK-EL-HF-NAN: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -495,7 +495,7 @@
 // = Little-endian, hard float, uclibc, nan2008
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -muclibc -mnan=2008 \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-HF-NAN %s
 // CHECK-EL-UC-HF-NAN: "-internal-isystem"
 // CHECK-EL-UC-HF-NAN: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -524,7 +524,7 @@
 // = Little-endian, soft float
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mfloat-abi=soft \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-32 %s
 // CHECK-EL-SF-32: "-internal-isystem"
 // CHECK-EL-SF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -553,7 +553,7 @@
 // = Little-endian, soft float, uclibc
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mfloat-abi=soft -muclibc \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-UC-SF-32 %s
 // CHECK-EL-UC-SF-32: "-internal-isystem"
 // CHECK-EL-UC-SF-32: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -582,7 +582,7 @@
 // = Little-endian, soft float, mips16
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mips16 -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-16 %s
 // CHECK-EL-SF-16: "-internal-isystem"
 // CHECK-EL-SF-16: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -611,7 +611,7 @@
 // = Little-endian, soft float, micromips
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mipsel-linux-gnu -mmicromips -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-MICRO %s
 // CHECK-EL-SF-MICRO: "-internal-isystem"
 // CHECK-EL-SF-MICRO: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -640,7 +640,7 @@
 // = Little-endian, hard float, 64-bit
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-HF-64 %s
 // CHECK-EL-HF-64: "-internal-isystem"
 // CHECK-EL-HF-64: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
@@ -669,7 +669,7 @@
 // = Little-endian, soft float, 64-bit
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnu -msoft-float \
-// RUN:     --gcc-toolchain=%S/Inputs/mips_cs_tree \
+// RUN:     -stdlib=libstdc++ --gcc-toolchain=%S/Inputs/mips_cs_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-EL-SF-64 %s
 // CHECK-EL-SF-64: "-internal-isystem"
 // CHECK-EL-SF-64: "[[TC:[^"]+/lib/gcc/mips-linux-gnu/4.6.3]]/../../../../mips-linux-gnu/include/c++/4.6.3"
Index: test/Driver/linux-header-search.cpp
===================================================================
--- test/Driver/linux-header-search.cpp
+++ test/Driver/linux-header-search.cpp
@@ -64,7 +64,7 @@
 //
 // Test a very broken version of multiarch that shipped in Ubuntu 11.04.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target i386-unknown-linux \
+// RUN:     -target i386-unknown-linux -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_11.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-11-04 %s
@@ -80,7 +80,7 @@
 // CHECK-UBUNTU-11-04: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu \
+// RUN:     -target x86_64-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_13.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-13-04 %s
@@ -97,7 +97,7 @@
 // CHECK-UBUNTU-13-04: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnux32 \
+// RUN:     -target x86_64-unknown-linux-gnux32 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_14.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-14-04 %s
@@ -114,7 +114,7 @@
 // CHECK-UBUNTU-14-04: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 ///
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target arm-linux-gnueabihf \
+// RUN:     -target arm-linux-gnueabihf -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_13.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-13-04-CROSS %s
@@ -131,7 +131,7 @@
 //
 // Test Ubuntu/Debian's new version of multiarch, with -m32.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu -m32 \
+// RUN:     -target x86_64-unknown-linux-gnu -m32 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_13.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-13-04-M32 %s
@@ -145,7 +145,7 @@
 // Test Ubuntu/Debian's Ubuntu 14.04 config variant, with -m32
 // and an empty 4.9 directory.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu -m32 \
+// RUN:     -target x86_64-unknown-linux-gnu -m32 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_14.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-14-04-M32 %s
@@ -160,7 +160,7 @@
 // installed rather than relying on multilib. Also happens to look like an
 // actual i686 Ubuntu system.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu -m32 \
+// RUN:     -target x86_64-unknown-linux-gnu -m32 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_14.04_multiarch_tree2 \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-14-04-I686 %s
@@ -173,7 +173,7 @@
 //
 // Test Ubuntu/Debian's Ubuntu 14.04 for powerpc64le
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target powerpc64le-unknown-linux-gnu -m32 \
+// RUN:     -target powerpc64le-unknown-linux-gnu -m32 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/ubuntu_14.04_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-UBUNTU-14-04-PPC64LE %s
@@ -189,7 +189,7 @@
 //
 // Thoroughly exercise the Debian multiarch environment.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target i686-linux-gnu \
+// RUN:     -target i686-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-X86 %s
@@ -205,7 +205,7 @@
 // CHECK-DEBIAN-X86: "-internal-externc-isystem" "[[SYSROOT]]/include"
 // CHECK-DEBIAN-X86: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-linux-gnu \
+// RUN:     -target x86_64-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-X86-64 %s
@@ -221,7 +221,7 @@
 // CHECK-DEBIAN-X86-64: "-internal-externc-isystem" "[[SYSROOT]]/include"
 // CHECK-DEBIAN-X86-64: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target powerpc-linux-gnu \
+// RUN:     -target powerpc-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-PPC %s
@@ -237,7 +237,7 @@
 // CHECK-DEBIAN-PPC: "-internal-externc-isystem" "[[SYSROOT]]/include"
 // CHECK-DEBIAN-PPC: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target powerpc64-linux-gnu \
+// RUN:     -target powerpc64-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_multiarch_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-PPC64 %s
@@ -256,7 +256,7 @@
 // Test Gentoo's weirdness both before and after they changed it in their GCC
 // 4.6.4 release.
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu \
+// RUN:     -target x86_64-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/gentoo_linux_gcc_4.6.2_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-GENTOO-4-6-2 %s
@@ -271,7 +271,7 @@
 // CHECK-GENTOO-4-6-2: "-internal-externc-isystem" "[[SYSROOT]]/include"
 // CHECK-GENTOO-4-6-2: "-internal-externc-isystem" "[[SYSROOT]]/usr/include"
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target x86_64-unknown-linux-gnu \
+// RUN:     -target x86_64-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/gentoo_linux_gcc_4.6.4_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-GENTOO-4-6-4 %s
@@ -288,7 +288,7 @@
 //
 // Check header search on Debian 6 / MIPS64
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target mips64-unknown-linux-gnuabi64 \
+// RUN:     -target mips64-unknown-linux-gnuabi64 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPS64-GNUABI %s
@@ -306,7 +306,7 @@
 //
 // Check header search on Debian 6 / MIPS64
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target mips64el-unknown-linux-gnuabi64 \
+// RUN:     -target mips64el-unknown-linux-gnuabi64 -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPS64EL-GNUABI %s
@@ -324,7 +324,7 @@
 
 // Check header search on Debian 8 / Sparc
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target sparc-unknown-linux-gnu \
+// RUN:     -target sparc-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_8_sparc_multilib_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-SPARC32 %s
@@ -342,7 +342,7 @@
 
 // Check header search on Debian 8 / Sparc, with the oldstyle multilib packages
 // RUN: %clang -no-canonical-prefixes -m64 %s -### -fsyntax-only 2>&1 \
-// RUN:     -target sparc-unknown-linux-gnu \
+// RUN:     -target sparc-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_8_sparc_multilib_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-SPARC32-LIB64 %s
@@ -363,7 +363,7 @@
 
 // Check header search on Debian 8 / Sparc64
 // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
-// RUN:     -target sparc64-unknown-linux-gnu \
+// RUN:     -target sparc64-unknown-linux-gnu -stdlib=libstdc++ \
 // RUN:     --sysroot=%S/Inputs/debian_8_sparc64_tree \
 // RUN:     --gcc-toolchain="" \
 // RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-SPARC64 %s
Index: test/Driver/gcc-toolchain.cpp
===================================================================
--- test/Driver/gcc-toolchain.cpp
+++ test/Driver/gcc-toolchain.cpp
@@ -1,13 +1,13 @@
 // Test that gcc-toolchain option is working correctly
 //
 // RUN: %clangxx -no-canonical-prefixes %s -### -o %t 2>&1 \
-// RUN:     --target=i386-unknown-linux \
+// RUN:     --target=i386-unknown-linux -stdlib=libstdc++ \
 // RUN:     --gcc-toolchain=%S/Inputs/ubuntu_11.04_multiarch_tree/usr \
 // RUN:   | FileCheck %s
 //
 // Additionally check that the legacy spelling of the flag works.
 // RUN: %clangxx -no-canonical-prefixes %s -### -o %t 2>&1 \
-// RUN:     --target=i386-unknown-linux \
+// RUN:     --target=i386-unknown-linux -stdlib=libstdc++ \
 // RUN:     -gcc-toolchain %S/Inputs/ubuntu_11.04_multiarch_tree/usr \
 // RUN:   | FileCheck %s
 //
Index: test/Driver/darwin-sanitizer-ld.c
===================================================================
--- test/Driver/darwin-sanitizer-ld.c
+++ test/Driver/darwin-sanitizer-ld.c
@@ -1,7 +1,7 @@
 // Test sanitizer link flags on Darwin.
 
 // RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
-// RUN:   -fsanitize=address %s -o %t.o 2>&1 \
+// RUN:   -stdlib=libstdc++ -fsanitize=address %s -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN %s
 
 // CHECK-ASAN: "{{.*}}ld{{(.exe)?}}"
@@ -21,7 +21,7 @@
 // CHECK-DYN-ASAN: "-rpath" "{{.*}}lib{{.*}}darwin"
 
 // RUN: %clang -no-canonical-prefixes -### -target x86_64-darwin \
-// RUN:   -fsanitize=undefined %s -o %t.o 2>&1 \
+// RUN:   -stdlib=libstdc++ -fsanitize=undefined %s -o %t.o 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-UBSAN %s
 
 // CHECK-UBSAN: "{{.*}}ld{{(.exe)?}}"
Index: test/Driver/darwin-objc-gc.m
===================================================================
--- test/Driver/darwin-objc-gc.m
+++ test/Driver/darwin-objc-gc.m
@@ -1,6 +1,6 @@
 // Check that we warn, but accept, -fobjc-gc for iPhone OS.
 
-// RUN: %clang -target i386-apple-darwin9 -miphoneos-version-min=3.0 -fobjc-gc -flto -S -o %t %s 2> %t.err
+// RUN: %clang -target i386-apple-darwin9 -miphoneos-version-min=3.0 -stdlib=libstdc++ -fobjc-gc -flto -S -o %t %s 2> %t.err
 // RUN: FileCheck --check-prefix=IPHONE_OBJC_GC_LL %s < %t 
 // RUN: FileCheck --check-prefix=IPHONE_OBJC_GC_STDERR %s < %t.err
 
Index: test/Driver/darwin-iphone-defaults.m
===================================================================
--- test/Driver/darwin-iphone-defaults.m
+++ test/Driver/darwin-iphone-defaults.m
@@ -1,4 +1,4 @@
-// RUN: %clang -target i386-apple-darwin9 -miphoneos-version-min=3.0 -arch armv7 -flto -S -o - %s | FileCheck %s
+// RUN: %clang -target i386-apple-darwin9 -miphoneos-version-min=3.0 -arch armv7 -stdlib=libstdc++ -flto -S -o - %s | FileCheck %s
 
 // CHECK: @f0() [[F0:#[0-9]+]]
 // CHECK: @__f0_block_invoke
Index: test/Driver/android-standalone.cpp
===================================================================
--- test/Driver/android-standalone.cpp
+++ test/Driver/android-standalone.cpp
@@ -2,7 +2,7 @@
 // toolchain.
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm-linux-androideabi \
+// RUN:     -target arm-linux-androideabi -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck  %s
@@ -17,7 +17,7 @@
 // CHECK: "-L{{.*}}/sysroot/usr/lib"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target aarch64-linux-android \
+// RUN:     -target aarch64-linux-android -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-AARCH64 %s
@@ -32,7 +32,7 @@
 // CHECK-AARCH64: "-L{{.*}}/sysroot/usr/lib"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
-// RUN:     -target arm64-linux-android \
+// RUN:     -target arm64-linux-android -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-ARM64 %s
@@ -48,7 +48,7 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target mipsel-linux-android \
-// RUN:     -mips32 \
+// RUN:     -mips32 -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPS %s
@@ -64,7 +64,7 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target mipsel-linux-android \
-// RUN:     -march=mips32 -mips32r2 \
+// RUN:     -march=mips32 -mips32r2 -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPSR2 %s
@@ -80,7 +80,7 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target mipsel-linux-android \
-// RUN:     -mips32 -march=mips32r2 \
+// RUN:     -mips32 -march=mips32r2 -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPSR2-A %s
@@ -96,7 +96,7 @@
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     -target mipsel-linux-android \
-// RUN:     -mips32r6 \
+// RUN:     -mips32r6 -stdlib=libstdc++ \
 // RUN:     -B%S/Inputs/basic_android_tree \
 // RUN:     --sysroot=%S/Inputs/basic_android_tree/sysroot \
 // RUN:   | FileCheck --check-prefix=CHECK-MIPSR6 %s
Index: lib/Driver/ToolChains.h
===================================================================
--- lib/Driver/ToolChains.h
+++ lib/Driver/ToolChains.h
@@ -512,6 +512,7 @@
   TranslateArgs(const llvm::opt::DerivedArgList &Args,
                 const char *BoundArch) const override;
 
+  CXXStdlibType GetDefaultCXXStdlibType() const override;
   ObjCRuntime getDefaultObjCRuntime(bool isNonFragile) const override;
   bool hasBlocksRuntime() const override;
 
@@ -699,7 +700,7 @@
   bool IsMathErrnoDefault() const override { return false; }
   bool IsObjCNonFragileABIDefault() const override { return true; }
 
-  CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const override;
+  CXXStdlibType GetDefaultCXXStdlibType() const override;
   void AddClangCXXStdlibIncludeArgs(
       const llvm::opt::ArgList &DriverArgs,
       llvm::opt::ArgStringList &CC1Args) const override;
Index: lib/Driver/ToolChains.cpp
===================================================================
--- lib/Driver/ToolChains.cpp
+++ lib/Driver/ToolChains.cpp
@@ -65,6 +65,16 @@
 
 bool MachO::HasNativeLLVMSupport() const { return true; }
 
+ToolChain::CXXStdlibType Darwin::GetDefaultCXXStdlibType() const {
+  // Default to use libc++ on OS X 10.9+ and iOS 7+.
+  if ((isTargetMacOS() && !isMacosxVersionLT(10, 9)) ||
+       (isTargetIOSBased() && !isIPhoneOSVersionLT(7, 0)) ||
+       isTargetWatchOSBased())
+    return ToolChain::CST_Libcxx;
+
+  return ToolChain::CST_Libstdcxx;
+}
+
 /// Darwin provides an ARC runtime starting in MacOS X 10.7 and iOS 5.0.
 ObjCRuntime Darwin::getDefaultObjCRuntime(bool isNonFragile) const {
   if (isTargetWatchOSBased())
@@ -1020,7 +1030,6 @@
                                       const char *BoundArch) const {
   // First get the generic Apple args, before moving onto Darwin-specific ones.
   DerivedArgList *DAL = MachO::TranslateArgs(Args, BoundArch);
-  const OptTable &Opts = getDriver().getOpts();
 
   // If no architecture is bound, none of the translations here are relevant.
   if (!BoundArch)
@@ -1051,14 +1060,6 @@
     }
   }
 
-  // Default to use libc++ on OS X 10.9+ and iOS 7+.
-  if (((isTargetMacOS() && !isMacosxVersionLT(10, 9)) ||
-       (isTargetIOSBased() && !isIPhoneOSVersionLT(7, 0)) ||
-       isTargetWatchOSBased()) &&
-      !Args.getLastArg(options::OPT_stdlib_EQ))
-    DAL->AddJoinedArg(nullptr, Opts.getOption(options::OPT_stdlib_EQ),
-                      "libc++");
-
   // Validate the C++ standard library choice.
   CXXStdlibType Type = GetCXXStdlibType(*DAL);
   if (Type == ToolChain::CST_Libcxx) {
@@ -3027,16 +3028,7 @@
 
 Tool *Bitrig::buildLinker() const { return new tools::bitrig::Linker(*this); }
 
-ToolChain::CXXStdlibType Bitrig::GetCXXStdlibType(const ArgList &Args) const {
-  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
-    StringRef Value = A->getValue();
-    if (Value == "libstdc++")
-      return ToolChain::CST_Libstdcxx;
-    if (Value == "libc++")
-      return ToolChain::CST_Libcxx;
-
-    getDriver().Diag(diag::err_drv_invalid_stdlib_name) << A->getAsString(Args);
-  }
+ToolChain::CXXStdlibType Bitrig::GetDefaultCXXStdlibType() const {
   return ToolChain::CST_Libcxx;
 }
 
Index: lib/Driver/ToolChain.cpp
===================================================================
--- lib/Driver/ToolChain.cpp
+++ lib/Driver/ToolChain.cpp
@@ -9,6 +9,7 @@
 
 #include "Tools.h"
 #include "clang/Basic/ObjCRuntime.h"
+#include "clang/Config/config.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
@@ -533,18 +534,34 @@
   return GetDefaultRuntimeLibType();
 }
 
+static bool ParseCXXStdlibType(const StringRef& Name,
+                               ToolChain::CXXStdlibType& Type) {
+  if (Name == "libc++")
+    Type = ToolChain::CST_Libcxx;
+  else if (Name == "libstdc++")
+    Type = ToolChain::CST_Libstdcxx;
+  else
+    return false;
+
+  return true;
+}
+
 ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
-  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
-    StringRef Value = A->getValue();
-    if (Value == "libc++")
-      return ToolChain::CST_Libcxx;
-    if (Value == "libstdc++")
-      return ToolChain::CST_Libstdcxx;
-    getDriver().Diag(diag::err_drv_invalid_stdlib_name)
-      << A->getAsString(Args);
+  ToolChain::CXXStdlibType Type;
+  bool HasValidType = false;
+
+  const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
+  if (A) {
+    HasValidType = ParseCXXStdlibType(A->getValue(), Type);
+    if (!HasValidType)
+      getDriver().Diag(diag::err_drv_invalid_stdlib_name)
+        << A->getAsString(Args);
   }
 
-  return ToolChain::CST_Libstdcxx;
+  if (!HasValidType && !ParseCXXStdlibType(CLANG_DEFAULT_CXX_STDLIB, Type))
+    Type = GetDefaultCXXStdlibType();
+
+  return Type;
 }
 
 /// \brief Utility function to add a system include directory to CC1 arguments.
Index: include/clang/Driver/ToolChain.h
===================================================================
--- include/clang/Driver/ToolChain.h
+++ include/clang/Driver/ToolChain.h
@@ -256,6 +256,10 @@
     return ToolChain::RLT_Libgcc;
   }
 
+  virtual CXXStdlibType GetDefaultCXXStdlibType() const {
+    return ToolChain::CST_Libstdcxx;
+  }
+
   virtual std::string getCompilerRT(const llvm::opt::ArgList &Args,
                                     StringRef Component,
                                     bool Shared = false) const;
Index: include/clang/Config/config.h.in
===================================================================
--- include/clang/Config/config.h.in
+++ include/clang/Config/config.h.in
@@ -8,6 +8,9 @@
 /* Bug report URL. */
 #undef BUG_REPORT_URL
 
+/* Default C++ stdlib to use. */
+#undef CLANG_DEFAULT_CXX_STDLIB
+
 /* Default OpenMP runtime used by -fopenmp. */
 #undef CLANG_DEFAULT_OPENMP_RUNTIME
 
Index: include/clang/Config/config.h.cmake
===================================================================
--- include/clang/Config/config.h.cmake
+++ include/clang/Config/config.h.cmake
@@ -8,6 +8,9 @@
 /* Bug report URL. */
 #define BUG_REPORT_URL "${BUG_REPORT_URL}"
 
+/* Default C++ stdlib to use. */
+#define CLANG_DEFAULT_CXX_STDLIB "${CLANG_DEFAULT_CXX_STDLIB}"
+
 /* Default OpenMP runtime used by -fopenmp. */
 #define CLANG_DEFAULT_OPENMP_RUNTIME "${CLANG_DEFAULT_OPENMP_RUNTIME}"
 
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -197,6 +197,15 @@
 set(DEFAULT_SYSROOT "" CACHE PATH
   "Default <path> to all compiler invocations for --sysroot=<path>." )
 
+set(CLANG_DEFAULT_CXX_STDLIB "" CACHE STRING
+  "Default C++ stdlib to use (empty for architecture default, \"libstdc++\" or \"libc++\"")
+if (NOT(CLANG_DEFAULT_CXX_STDLIB STREQUAL "" OR
+        CLANG_DEFAULT_CXX_STDLIB STREQUAL "libstdc++" OR
+        CLANG_DEFAULT_CXX_STDLIB STREQUAL "libc++"))
+  message(WARNING "Resetting default C++ stdlib to use architecture default")
+  set(CLANG_DEFAULT_CXX_STDLIB "")
+endif()
+
 set(CLANG_DEFAULT_OPENMP_RUNTIME "libomp" CACHE STRING
   "Default OpenMP runtime used by -fopenmp.")

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Re: [PATCH] D15920: [CMake] Add option to switch default C++ stdlib

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