text: // UNSUPPORTED: system-windows
  
  // General tests that the header search paths for libc++ detected by the driver
  // and passed to CC1 are correct on Darwin platforms.
  
  // Check without a sysroot and without headers alongside the installation
  // (no include path should be added, and no warning or error).
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain_no_libcxx/usr/bin \
  // RUN:   | FileCheck --check-prefix=CHECK-LIBCXX-NONE %s
  // CHECK-LIBCXX-NONE: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  
  // Check with only headers alongside the installation (those should be used,
  // but we should still add /usr/include/c++/v1 after to preserve legacy).
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:   | FileCheck -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain --check-prefix=CHECK-LIBCXX-TOOLCHAIN-1 %s
  // CHECK-LIBCXX-TOOLCHAIN-1: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  // CHECK-LIBCXX-TOOLCHAIN-1: "-internal-isystem" "[[TOOLCHAIN]]/usr/bin/../include/c++/v1"
  // CHECK-LIBCXX-TOOLCHAIN-1: "-internal-isystem" "/usr/include/c++/v1"
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -isysroot %S/Inputs/basic_darwin_sdk_no_libcxx \
  // RUN:   | FileCheck -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain --check-prefix=CHECK-LIBCXX-TOOLCHAIN-2 %s
  // CHECK-LIBCXX-TOOLCHAIN-2: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  // CHECK-LIBCXX-TOOLCHAIN-2: "-internal-isystem" "[[TOOLCHAIN]]/usr/bin/../include/c++/v1"
  
  // Check with both headers in the sysroot and headers alongside the installation
  // (the headers in <sysroot> should be added after the toolchain headers).
  // Ensure that both -isysroot and --sysroot work, and that isysroot has precedence.
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -resource-dir=%S/Inputs/resource_dir \
  // RUN:     -isysroot %S/Inputs/basic_darwin_sdk_usr \
  // RUN:   | FileCheck -DSYSROOT=%S/Inputs/basic_darwin_sdk_usr \
  // RUN:               -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain \
  // RUN:               --check-prefix=CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1 %s
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -resource-dir=%S/Inputs/resource_dir \
  // RUN:     --sysroot %S/Inputs/basic_darwin_sdk_usr \
  // RUN:   | FileCheck -DSYSROOT=%S/Inputs/basic_darwin_sdk_usr \
  // RUN:               -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain \
  // RUN:               --check-prefix=CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1 %s
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin \
  // RUN:     -stdlib=libc++ \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -resource-dir=%S/Inputs/resource_dir \
  // RUN:     -isysroot %S/Inputs/basic_darwin_sdk_usr \
  // RUN:     --sysroot %S/Inputs/basic_darwin_sdk_no_libcxx \
  // RUN:   | FileCheck -DSYSROOT=%S/Inputs/basic_darwin_sdk_usr \
  // RUN:               -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain \
  // RUN:               --check-prefix=CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1 %s
  //
  // CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  // CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1: "-internal-isystem" "[[TOOLCHAIN]]/usr/bin/../include/c++/v1"
  // CHECK-LIBCXX-SYSROOT_AND_TOOLCHAIN-1: "-internal-isystem" "[[SYSROOT]]/usr/include/c++/v1"
  
  // Make sure that using -nostdinc or -nostdlibinc will drop the non-toolchain
  // C++ library include paths (so all except <toolchain>/usr/bin/../include/c++/v1).
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin16 \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -resource-dir=%S/Inputs/resource_dir \
  // RUN:     -isysroot %S/Inputs/basic_darwin_sdk_usr \
  // RUN:     -stdlib=platform \
  // RUN:     -nostdinc \
  // RUN:   | FileCheck -DSYSROOT=%S/Inputs/basic_darwin_sdk_usr \
  // RUN:               -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain \
  // RUN:               --check-prefix=CHECK-LIBCXX-NOSTDINC %s
  // CHECK-LIBCXX-NOSTDINC: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  // CHECK-LIBCXX-NOSTDINC: "-internal-isystem" "[[TOOLCHAIN]]/usr/bin/../include/c++/v1"
  // CHECK-LIBCXX-NOSTDINC-NOT: "-internal-isystem" "[[SYSROOT]]/usr/include/c++/v1"
  //
  // RUN: %clang -no-canonical-prefixes %s -### -fsyntax-only 2>&1 \
  // RUN:     -target x86_64-apple-darwin16 \
  // RUN:     -ccc-install-dir %S/Inputs/basic_darwin_toolchain/usr/bin \
  // RUN:     -resource-dir=%S/Inputs/resource_dir \
  // RUN:     -isysroot %S/Inputs/basic_darwin_sdk_usr \
  // RUN:     -stdlib=platform \
  // RUN:     -nostdinc \
  // RUN:   | FileCheck -DSYSROOT=%S/Inputs/basic_darwin_sdk_usr \
  // RUN:               -DTOOLCHAIN=%S/Inputs/basic_darwin_toolchain \
  // RUN:               --check-prefix=CHECK-LIBCXX-NOSTDLIBINC %s
  // CHECK-LIBCXX-NOSTDLIBINC: "{{[^"]*}}clang{{[^"]*}}" "-cc1"
  // CHECK-LIBCXX-NOSTDLIBINC: "-internal-isystem" "[[TOOLCHAIN]]/usr/bin/../include/c++/v1"
  // CHECK-LIBCXX-NOSTDLIBINC-NOT: "-internal-isystem" "[[SYSROOT]]/usr/include/c++/v1"
  