diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
--- a/clang/include/clang/Basic/Attr.td
+++ b/clang/include/clang/Basic/Attr.td
@@ -918,6 +918,7 @@
              .Case("maccatalyst_app_extension", "macCatalyst (App Extension)")
              .Case("swift", "Swift")
              .Case("shadermodel", "HLSL ShaderModel")
+             .Case("ohos", "OpenHarmony OS")
              .Default(llvm::StringRef());
 }
 static llvm::StringRef getPlatformNameSourceSpelling(llvm::StringRef Platform) {
diff --git a/clang/include/clang/Driver/ToolChain.h b/clang/include/clang/Driver/ToolChain.h
--- a/clang/include/clang/Driver/ToolChain.h
+++ b/clang/include/clang/Driver/ToolChain.h
@@ -494,7 +494,7 @@
 
   // Returns <ResourceDir>/lib/<OSName>/<arch>.  This is used by runtimes (such
   // as OpenMP) to find arch-specific libraries.
-  std::string getArchSpecificLibPath() const;
+  virtual std::string getArchSpecificLibPath() const;
 
   // Returns <OSname> part of above.
   virtual StringRef getOSLibName() const;
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -98,7 +98,8 @@
   // https://www.gnu.org/software/libc/manual/html_node/Malloc-Examples.html.
   // This alignment guarantee also applies to Windows and Android. On Darwin
   // and OpenBSD, the alignment is 16 bytes on both 64-bit and 32-bit systems.
-  if (T.isGNUEnvironment() || T.isWindowsMSVCEnvironment() || T.isAndroid())
+  if (T.isGNUEnvironment() || T.isWindowsMSVCEnvironment() || T.isAndroid() ||
+      T.isOHOSFamily())
     NewAlign = Triple.isArch64Bit() ? 128 : Triple.isArch32Bit() ? 64 : 0;
   else if (T.isOSDarwin() || T.isOSOpenBSD())
     NewAlign = 128;
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -148,7 +148,12 @@
     case llvm::Triple::Fuchsia:
       return new FuchsiaTargetInfo<AArch64leTargetInfo>(Triple, Opts);
     case llvm::Triple::Linux:
-      return new LinuxTargetInfo<AArch64leTargetInfo>(Triple, Opts);
+      switch (Triple.getEnvironment()) {
+      default:
+        return new LinuxTargetInfo<AArch64leTargetInfo>(Triple, Opts);
+      case llvm::Triple::OpenHOS:
+        return new OHOSTargetInfo<AArch64leTargetInfo>(Triple, Opts);
+      }
     case llvm::Triple::NetBSD:
       return new NetBSDTargetInfo<AArch64leTargetInfo>(Triple, Opts);
     case llvm::Triple::OpenBSD:
@@ -188,7 +193,14 @@
     case llvm::Triple::CloudABI:
       return new CloudABITargetInfo<ARMleTargetInfo>(Triple, Opts);
     case llvm::Triple::Linux:
-      return new LinuxTargetInfo<ARMleTargetInfo>(Triple, Opts);
+      switch (Triple.getEnvironment()) {
+      default:
+        return new LinuxTargetInfo<ARMleTargetInfo>(Triple, Opts);
+      case llvm::Triple::OpenHOS:
+        return new OHOSTargetInfo<ARMleTargetInfo>(Triple, Opts);
+      }
+    case llvm::Triple::LiteOS:
+      return new OHOSTargetInfo<ARMleTargetInfo>(Triple, Opts);
     case llvm::Triple::FreeBSD:
       return new FreeBSDTargetInfo<ARMleTargetInfo>(Triple, Opts);
     case llvm::Triple::NetBSD:
@@ -263,7 +275,12 @@
   case llvm::Triple::mipsel:
     switch (os) {
     case llvm::Triple::Linux:
-      return new LinuxTargetInfo<MipsTargetInfo>(Triple, Opts);
+      switch (Triple.getEnvironment()) {
+      default:
+        return new LinuxTargetInfo<MipsTargetInfo>(Triple, Opts);
+      case llvm::Triple::OpenHOS:
+        return new OHOSTargetInfo<MipsTargetInfo>(Triple, Opts);
+      }
     case llvm::Triple::RTEMS:
       return new RTEMSTargetInfo<MipsTargetInfo>(Triple, Opts);
     case llvm::Triple::FreeBSD:
@@ -423,7 +440,12 @@
     case llvm::Triple::Fuchsia:
       return new FuchsiaTargetInfo<RISCV64TargetInfo>(Triple, Opts);
     case llvm::Triple::Linux:
-      return new LinuxTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+      switch (Triple.getEnvironment()) {
+      default:
+        return new LinuxTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+      case llvm::Triple::OpenHOS:
+        return new OHOSTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+      }
     default:
       return new RISCV64TargetInfo(Triple, Opts);
     }
@@ -561,6 +583,8 @@
         return new LinuxTargetInfo<X86_64TargetInfo>(Triple, Opts);
       case llvm::Triple::Android:
         return new AndroidX86_64TargetInfo(Triple, Opts);
+      case llvm::Triple::OpenHOS:
+        return new OHOSX86_64TargetInfo(Triple, Opts);
       }
     }
     case llvm::Triple::DragonFly:
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -310,6 +310,7 @@
     case llvm::Triple::GNUEABIHF:
     case llvm::Triple::MuslEABI:
     case llvm::Triple::MuslEABIHF:
+    case llvm::Triple::OpenHOS:
       setABI("aapcs-linux");
       break;
     case llvm::Triple::EABIHF:
diff --git a/clang/lib/Basic/Targets/OSTargets.h b/clang/lib/Basic/Targets/OSTargets.h
--- a/clang/lib/Basic/Targets/OSTargets.h
+++ b/clang/lib/Basic/Targets/OSTargets.h
@@ -1007,6 +1007,68 @@
   }
 };
 
+// OHOS target
+template <typename Target>
+class LLVM_LIBRARY_VISIBILITY OHOSTargetInfo : public OSTargetInfo<Target> {
+protected:
+  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
+                    MacroBuilder &Builder) const override {
+    // Linux defines; list based off of gcc output
+    DefineStd(Builder, "unix", Opts);
+
+    Builder.defineMacro("__ELF__");
+
+    // Generic OHOS target defines
+    if (Triple.isOHOSFamily()) {
+      Builder.defineMacro("__OHOS_FAMILY__", "1");
+
+      auto Version = Triple.getEnvironmentVersion();
+      this->PlatformName = "ohos";
+      this->PlatformMinVersion = Version;
+      Builder.defineMacro("__OHOS_Major__", Twine(Version.getMajor()));
+      if (auto Minor = Version.getMinor())
+        Builder.defineMacro("__OHOS_Minor__", Twine(*Minor));
+      if (auto Subminor = Version.getSubminor())
+        Builder.defineMacro("__OHOS_Micro__", Twine(*Subminor));
+    }
+
+    if (Triple.isOpenHOS())
+      Builder.defineMacro("__OHOS__");
+
+    if (Triple.isOSLinux()) {
+      DefineStd(Builder, "linux", Opts);
+    } else if (Triple.isOSLiteOS()) {
+      Builder.defineMacro("__LITEOS__");
+    }
+
+    if (Opts.POSIXThreads)
+      Builder.defineMacro("_REENTRANT");
+    if (Opts.CPlusPlus)
+      Builder.defineMacro("_GNU_SOURCE");
+    if (this->HasFloat128)
+      Builder.defineMacro("__FLOAT128__");
+  }
+
+public:
+  OHOSTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : OSTargetInfo<Target>(Triple, Opts) {
+    this->WIntType = TargetInfo::UnsignedInt;
+
+    switch (Triple.getArch()) {
+    default:
+      break;
+    case llvm::Triple::x86:
+    case llvm::Triple::x86_64:
+      this->HasFloat128 = true;
+      break;
+    }
+  }
+
+  const char *getStaticInitSectionSpecifier() const override {
+    return ".text.startup";
+  }
+};
+
 } // namespace targets
 } // namespace clang
 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_OSTARGETS_H
diff --git a/clang/lib/Basic/Targets/X86.h b/clang/lib/Basic/Targets/X86.h
--- a/clang/lib/Basic/Targets/X86.h
+++ b/clang/lib/Basic/Targets/X86.h
@@ -963,6 +963,28 @@
     LongDoubleFormat = &llvm::APFloat::IEEEquad();
   }
 };
+
+// x86_32 OHOS target
+class LLVM_LIBRARY_VISIBILITY OHOSX86_32TargetInfo
+    : public OHOSTargetInfo<X86_32TargetInfo> {
+public:
+  OHOSX86_32TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : OHOSTargetInfo<X86_32TargetInfo>(Triple, Opts) {
+    SuitableAlign = 32;
+    LongDoubleWidth = 64;
+    LongDoubleFormat = &llvm::APFloat::IEEEdouble();
+  }
+};
+
+// x86_64 OHOS target
+class LLVM_LIBRARY_VISIBILITY OHOSX86_64TargetInfo
+    : public OHOSTargetInfo<X86_64TargetInfo> {
+public:
+  OHOSX86_64TargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
+      : OHOSTargetInfo<X86_64TargetInfo>(Triple, Opts) {
+    LongDoubleFormat = &llvm::APFloat::IEEEquad();
+  }
+};
 } // namespace targets
 } // namespace clang
 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_X86_H
diff --git a/clang/lib/CodeGen/ABIInfo.h b/clang/lib/CodeGen/ABIInfo.h
--- a/clang/lib/CodeGen/ABIInfo.h
+++ b/clang/lib/CodeGen/ABIInfo.h
@@ -81,6 +81,7 @@
                                        QualType Ty) const = 0;
 
     bool isAndroid() const;
+    bool isOHOSFamily() const;
 
     /// Emit the target dependent code to load a value of
     /// \arg Ty from the \c __builtin_ms_va_list pointed to by \arg VAListAddr.
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -236,6 +236,10 @@
 
 bool ABIInfo::isAndroid() const { return getTarget().getTriple().isAndroid(); }
 
+bool ABIInfo::isOHOSFamily() const {
+  return getTarget().getTriple().isOHOSFamily();
+}
+
 bool ABIInfo::isHomogeneousAggregateBaseType(QualType Ty) const {
   return false;
 }
@@ -5733,7 +5737,7 @@
 
   uint64_t Size = getContext().getTypeSize(Ty);
   // Android promotes <2 x i8> to i16, not i32
-  if (isAndroid() && (Size <= 16)) {
+  if ((isAndroid() || isOHOSFamily()) && (Size <= 16)) {
     llvm::Type *ResType = llvm::Type::getInt16Ty(getVMContext());
     return ABIArgInfo::getDirect(ResType);
   }
@@ -6340,7 +6344,7 @@
     case llvm::Triple::MuslEABIHF:
       return true;
     default:
-      return false;
+      return getTarget().getTriple().isOHOSFamily();
     }
   }
 
diff --git a/clang/lib/Driver/CMakeLists.txt b/clang/lib/Driver/CMakeLists.txt
--- a/clang/lib/Driver/CMakeLists.txt
+++ b/clang/lib/Driver/CMakeLists.txt
@@ -76,6 +76,7 @@
   ToolChains/Myriad.cpp
   ToolChains/NaCl.cpp
   ToolChains/NetBSD.cpp
+  ToolChains/OHOS.cpp
   ToolChains/OpenBSD.cpp
   ToolChains/PS4CPU.cpp
   ToolChains/RISCVToolchain.cpp
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -40,6 +40,7 @@
 #include "ToolChains/Myriad.h"
 #include "ToolChains/NaCl.h"
 #include "ToolChains/NetBSD.h"
+#include "ToolChains/OHOS.h"
 #include "ToolChains/OpenBSD.h"
 #include "ToolChains/PPCFreeBSD.h"
 #include "ToolChains/PPCLinux.h"
@@ -6073,7 +6074,8 @@
                                                               Args);
       else if (Target.getArch() == llvm::Triple::ve)
         TC = std::make_unique<toolchains::VEToolChain>(*this, Target, Args);
-
+      else if (Target.isOHOSFamily())
+        TC = std::make_unique<toolchains::OHOS>(*this, Target, Args);
       else
         TC = std::make_unique<toolchains::Linux>(*this, Target, Args);
       break;
@@ -6137,6 +6139,9 @@
     case llvm::Triple::Hurd:
       TC = std::make_unique<toolchains::Hurd>(*this, Target, Args);
       break;
+    case llvm::Triple::LiteOS:
+      TC = std::make_unique<toolchains::OHOS>(*this, Target, Args);
+      break;
     case llvm::Triple::ZOS:
       TC = std::make_unique<toolchains::ZOS>(*this, Target, Args);
       break;
diff --git a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
--- a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -606,7 +606,7 @@
       Features.push_back("+fix-cortex-a53-835769");
     else
       Features.push_back("-fix-cortex-a53-835769");
-  } else if (Triple.isAndroid()) {
+  } else if (Triple.isAndroid() || Triple.isOHOSFamily()) {
     // Enabled A53 errata (835769) workaround by default on android
     Features.push_back("+fix-cortex-a53-835769");
   } else if (Triple.isOSFuchsia()) {
diff --git a/clang/lib/Driver/ToolChains/Arch/ARM.cpp b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
--- a/clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -275,6 +275,11 @@
 
 void arm::setFloatABIInTriple(const Driver &D, const ArgList &Args,
                               llvm::Triple &Triple) {
+  if (Triple.isOSLiteOS()) {
+    Triple.setEnvironment(llvm::Triple::OpenHOS);
+    return;
+  }
+
   bool isHardFloat =
       (arm::getARMFloatABI(D, Triple, Args) == arm::FloatABI::Hard);
 
@@ -294,6 +299,8 @@
     Triple.setEnvironment(isHardFloat ? llvm::Triple::MuslEABIHF
                                       : llvm::Triple::MuslEABI);
     break;
+  case llvm::Triple::OpenHOS:
+    break;
   default: {
     arm::FloatABI DefaultABI = arm::getDefaultFloatABI(Triple);
     if (DefaultABI != arm::FloatABI::Invalid &&
@@ -363,6 +370,8 @@
     return FloatABI::SoftFP;
 
   default:
+    if (Triple.isOHOSFamily())
+      return FloatABI::Soft;
     switch (Triple.getEnvironment()) {
     case llvm::Triple::GNUEABIHF:
     case llvm::Triple::MuslEABIHF:
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -957,7 +957,7 @@
   CmdArgs.push_back(getAsNeededOption(TC, false));
   // There's no libpthread or librt on RTEMS & Android.
   if (TC.getTriple().getOS() != llvm::Triple::RTEMS &&
-      !TC.getTriple().isAndroid()) {
+      !TC.getTriple().isAndroid() && !TC.getTriple().isOHOSFamily()) {
     CmdArgs.push_back("-lpthread");
     if (!TC.getTriple().isOSOpenBSD())
       CmdArgs.push_back("-lrt");
@@ -1381,6 +1381,10 @@
     }
   }
 
+  // OHOS-specific defaults for PIC/PIE
+  if (Triple.isOHOSFamily() && Triple.getArch() == llvm::Triple::aarch64)
+    PIC = true;
+
   // OpenBSD-specific defaults for PIE
   if (Triple.isOSOpenBSD()) {
     switch (ToolChain.getArch()) {
@@ -1667,6 +1671,12 @@
 static void AddUnwindLibrary(const ToolChain &TC, const Driver &D,
                              ArgStringList &CmdArgs, const ArgList &Args) {
   ToolChain::UnwindLibType UNW = TC.GetUnwindLibType(Args);
+  // By default OHOS binaries are linked statically to libunwind.
+  if (TC.getTriple().isOHOSFamily() && UNW == ToolChain::UNW_CompilerRT) {
+    CmdArgs.push_back("-l:libunwind.a");
+    return;
+  }
+
   // Targets that don't use unwind libraries.
   if ((TC.getTriple().isAndroid() && UNW == ToolChain::UNW_Libgcc) ||
       TC.getTriple().isOSIAMCU() || TC.getTriple().isOSBinFormatWasm() ||
diff --git a/clang/lib/Driver/ToolChains/Gnu.cpp b/clang/lib/Driver/ToolChains/Gnu.cpp
--- a/clang/lib/Driver/ToolChains/Gnu.cpp
+++ b/clang/lib/Driver/ToolChains/Gnu.cpp
@@ -405,6 +405,7 @@
   const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
 
   const llvm::Triple::ArchType Arch = ToolChain.getArch();
+  const bool isOHOSFamily = ToolChain.getTriple().isOHOSFamily();
   const bool isAndroid = ToolChain.getTriple().isAndroid();
   const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
   const bool IsVE = ToolChain.getTriple().isVE();
@@ -455,7 +456,7 @@
 
   // Most Android ARM64 targets should enable the linker fix for erratum
   // 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
-  if (Arch == llvm::Triple::aarch64 && isAndroid) {
+  if (Arch == llvm::Triple::aarch64 && (isAndroid || isOHOSFamily)) {
     std::string CPU = getCPUName(D, Args, Triple);
     if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
       CmdArgs.push_back("--fix-cortex-a53-843419");
@@ -641,7 +642,9 @@
         CmdArgs.push_back("--pop-state");
       }
 
-      if (WantPthread && !isAndroid)
+      // We don't need libpthread neither for bionic (Android) nor for musl,
+      // (used by OHOS as runtime library).
+      if (WantPthread && !isAndroid && !isOHOSFamily)
         CmdArgs.push_back("-lpthread");
 
       if (Args.hasArg(options::OPT_fsplit_stack))
diff --git a/clang/lib/Driver/ToolChains/OHOS.h b/clang/lib/Driver/ToolChains/OHOS.h
new file mode 100644
--- /dev/null
+++ b/clang/lib/Driver/ToolChains/OHOS.h
@@ -0,0 +1,94 @@
+//===--- OHOS.h - OHOS ToolChain Implementations ----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_OHOS_H
+#define LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_OHOS_H
+
+#include "Linux.h"
+#include "clang/Driver/Tool.h"
+#include "clang/Driver/ToolChain.h"
+
+namespace clang {
+namespace driver {
+namespace toolchains {
+
+class LLVM_LIBRARY_VISIBILITY OHOS : public Generic_ELF {
+public:
+  OHOS(const Driver &D, const llvm::Triple &Triple,
+          const llvm::opt::ArgList &Args);
+
+  bool HasNativeLLVMSupport() const override { return true; }
+  bool IsIntegratedAssemblerDefault() const override { return true; }
+  bool IsMathErrnoDefault() const override { return false; }
+  RuntimeLibType GetDefaultRuntimeLibType() const override {
+    return ToolChain::RLT_CompilerRT;
+  }
+  CXXStdlibType GetDefaultCXXStdlibType() const override {
+    return ToolChain::CST_Libcxx;
+  }
+  // Not add -funwind-tables by default
+  bool isPICDefault() const override { return false; }
+  bool isPIEDefault(const llvm::opt::ArgList &Args) const override { return true; }
+  bool isPICDefaultForced() const override { return false; }
+  bool useRelaxRelocations() const override { return false; }
+  UnwindLibType GetUnwindLibType(const llvm::opt::ArgList &Args) const override;
+  UnwindLibType GetDefaultUnwindLibType() const override { return UNW_CompilerRT; }
+
+  RuntimeLibType
+  GetRuntimeLibType(const llvm::opt::ArgList &Args) const override;
+  CXXStdlibType
+  GetCXXStdlibType(const llvm::opt::ArgList &Args) const override;
+
+  void
+  AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                            llvm::opt::ArgStringList &CC1Args) const override;
+  void
+  AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                               llvm::opt::ArgStringList &CC1Args) const override;
+  void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
+                           llvm::opt::ArgStringList &CmdArgs) const override;
+
+  std::string computeSysRoot() const override;
+  std::string getDynamicLinker(const llvm::opt::ArgList &Args) const override;
+
+  std::string
+  getCompilerRT(const llvm::opt::ArgList &Args, StringRef Component,
+                FileType Type = ToolChain::FT_Static) const override;
+
+  const char *getDefaultLinker() const override {
+    return "ld.lld";
+  }
+
+  Tool *buildLinker() const override {
+    return new tools::gnutools::Linker(*this);
+  }
+  Tool *buildAssembler() const override {
+    return new tools::gnutools::Assembler(*this);
+  }
+
+  path_list getRuntimePaths() const;
+
+protected:
+  std::string getMultiarchTriple(const llvm::Triple &T) const;
+  std::string getMultiarchTriple(const Driver &D,
+                                 const llvm::Triple &TargetTriple,
+                                 StringRef SysRoot) const override;
+  void addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const override;
+  SanitizerMask getSupportedSanitizers() const override;
+  void addProfileRTLibs(const llvm::opt::ArgList &Args,
+                             llvm::opt::ArgStringList &CmdArgs) const override;
+  std::string getArchSpecificLibPath() const override;
+private:
+  Multilib SelectedMultilib;
+};
+
+} // end namespace toolchains
+} // end namespace driver
+} // end namespace clang
+
+#endif // LLVM_CLANG_LIB_DRIVER_TOOLCHAINS_OHOS_H
diff --git a/clang/lib/Driver/ToolChains/OHOS.cpp b/clang/lib/Driver/ToolChains/OHOS.cpp
new file mode 100644
--- /dev/null
+++ b/clang/lib/Driver/ToolChains/OHOS.cpp
@@ -0,0 +1,411 @@
+//===--- OHOS.cpp - OHOS ToolChain Implementations --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "OHOS.h"
+#include "Arch/ARM.h"
+#include "CommonArgs.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/Compilation.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Driver/Options.h"
+#include "clang/Driver/SanitizerArgs.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/ProfileData/InstrProf.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/VirtualFileSystem.h"
+#include "llvm/Support/ScopedPrinter.h"
+
+using namespace clang::driver;
+using namespace clang::driver::toolchains;
+using namespace clang::driver::tools;
+using namespace clang;
+using namespace llvm::opt;
+using namespace clang::driver::tools::arm;
+
+using tools::addMultilibFlag;
+using tools::addPathIfExists;
+
+static bool findOHOSMuslMultilibs(const Multilib::flags_list &Flags,
+                                  DetectedMultilibs &Result) {
+  MultilibSet Multilibs;
+  Multilibs.push_back(Multilib());
+  // -mcpu=cortex-a7
+  // -mfloat-abi=soft -mfloat-abi=softfp -mfloat-abi=hard
+  // -mfpu=neon-vfpv4
+  Multilibs.push_back(Multilib("/a7_soft", {}, {}, 1,
+                          {"+mcpu=cortex-a7", "+mfloat-abi=soft"}));
+
+  Multilibs.push_back(Multilib("/a7_softfp_neon-vfpv4", {}, {}, 1,
+                          {"+mcpu=cortex-a7", "+mfloat-abi=softfp", "+mfpu=neon-vfpv4"}));
+
+  Multilibs.push_back(Multilib("/a7_hard_neon-vfpv4", {}, {}, 1,
+                          {"+mcpu=cortex-a7", "+mfloat-abi=hard", "+mfpu=neon-vfpv4"}));
+
+  if (Multilibs.select(Flags, Result.SelectedMultilib)) {
+    Result.Multilibs = Multilibs;
+    return true;
+  }
+  return false;
+}
+
+static bool findOHOSMultilibs(const Driver &D,
+                                      const ToolChain &TC,
+                                      const llvm::Triple &TargetTriple,
+                                      StringRef Path, const ArgList &Args,
+                                      DetectedMultilibs &Result) {
+  Multilib::flags_list Flags;
+  bool IsA7 = false;
+  if (const Arg *A = Args.getLastArg(options::OPT_mcpu_EQ))
+    IsA7 = A->getValue() == StringRef("cortex-a7");
+  addMultilibFlag(IsA7, "mcpu=cortex-a7", Flags);
+
+  bool IsMFPU = false;
+  if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ))
+    IsMFPU = A->getValue() == StringRef("neon-vfpv4");
+  addMultilibFlag(IsMFPU, "mfpu=neon-vfpv4", Flags);
+
+  tools::arm::FloatABI ARMFloatABI = getARMFloatABI(D, TargetTriple, Args);
+  addMultilibFlag((ARMFloatABI == tools::arm::FloatABI::Soft),
+      "mfloat-abi=soft", Flags);
+  addMultilibFlag((ARMFloatABI == tools::arm::FloatABI::SoftFP),
+      "mfloat-abi=softfp", Flags);
+  addMultilibFlag((ARMFloatABI == tools::arm::FloatABI::Hard),
+      "mfloat-abi=hard", Flags);
+
+  return findOHOSMuslMultilibs(Flags, Result);
+}
+
+std::string OHOS::getMultiarchTriple(const llvm::Triple &T) const {
+  // For most architectures, just use whatever we have rather than trying to be
+  // clever.
+  switch (T.getArch()) {
+  default:
+    break;
+
+  // We use the existence of '/lib/<triple>' as a directory to detect some
+  // common linux triples that don't quite match the Clang triple for both
+  // 32-bit and 64-bit targets. Multiarch fixes its install triples to these
+  // regardless of what the actual target triple is.
+  case llvm::Triple::arm:
+  case llvm::Triple::thumb:
+    return T.isOSLiteOS() ? "arm-liteos-ohos" : "arm-linux-ohos";
+  case llvm::Triple::riscv32:
+    return "riscv32-linux-ohos";
+  case llvm::Triple::riscv64:
+    return "riscv64-linux-ohos";
+  case llvm::Triple::mipsel:
+    return "mipsel-linux-ohos";
+  case llvm::Triple::x86:
+    return "i686-linux-ohos";
+  case llvm::Triple::x86_64:
+    return "x86_64-linux-ohos";
+  case llvm::Triple::aarch64:
+    return "aarch64-linux-ohos";
+  }
+  return T.str();
+}
+
+std::string OHOS::getMultiarchTriple(const Driver &D,
+                                     const llvm::Triple &TargetTriple,
+                                     StringRef SysRoot) const {
+  return getMultiarchTriple(TargetTriple);
+}
+
+static std::string makePath(const std::initializer_list<std::string> &IL) {
+  SmallString<128> P;
+  for (const auto &S : IL)
+    llvm::sys::path::append(P, S);
+  return static_cast<std::string>(P.str());
+}
+
+/// OHOS Toolchain
+OHOS::OHOS(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+    : Generic_ELF(D, Triple, Args) {
+  std::string SysRoot = computeSysRoot();
+
+  // Select the correct multilib according to the given arguments.
+  DetectedMultilibs Result;
+  findOHOSMultilibs(D, *this, Triple, "", Args, Result);
+  Multilibs = Result.Multilibs;
+  SelectedMultilib = Result.SelectedMultilib;
+
+  getFilePaths().clear();
+  std::string CandidateLibPath = getArchSpecificLibPath();
+  if (getVFS().exists(CandidateLibPath))
+    getFilePaths().push_back(CandidateLibPath);
+
+  getLibraryPaths().clear();
+  for (auto &Path : getRuntimePaths())
+    if (getVFS().exists(Path))
+      getLibraryPaths().push_back(Path);
+
+  // OHOS sysroots contain a library directory for each supported OS
+  // version as well as some unversioned libraries in the usual multiarch
+  // directory. Support --target=aarch64-linux-ohosX.Y.Z or
+  // --target=aarch64-linux-ohosX.Y or --target=aarch64-linux-ohosX
+  path_list &Paths = getFilePaths();
+  std::string SysRootLibPath = makePath({SysRoot, "usr", "lib"});
+  std::string MultiarchTriple = getMultiarchTriple(getTriple());
+  addPathIfExists(D, makePath({SysRootLibPath, SelectedMultilib.gccSuffix()}),
+                  Paths);
+  addPathIfExists(D,
+                  makePath({D.Dir, "..", "lib", MultiarchTriple,
+                            SelectedMultilib.gccSuffix()}),
+                  Paths);
+
+  addPathIfExists(
+      D,
+      makePath({SysRootLibPath, MultiarchTriple, SelectedMultilib.gccSuffix()}),
+      Paths);
+}
+
+ToolChain::RuntimeLibType OHOS::GetRuntimeLibType(
+    const ArgList &Args) const {
+  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_rtlib_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value != "compiler-rt")
+      getDriver().Diag(clang::diag::err_drv_invalid_rtlib_name)
+          << A->getAsString(Args);
+  }
+
+  return ToolChain::RLT_CompilerRT;
+}
+
+ToolChain::CXXStdlibType
+OHOS::GetCXXStdlibType(const ArgList &Args) const {
+  if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value != "libc++")
+      getDriver().Diag(diag::err_drv_invalid_stdlib_name)
+        << A->getAsString(Args);
+  }
+
+  return ToolChain::CST_Libcxx;
+}
+
+void OHOS::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
+                                        ArgStringList &CC1Args) const {
+  const Driver &D = getDriver();
+  const llvm::Triple &Triple = getTriple();
+  std::string SysRoot = computeSysRoot();
+
+  if (DriverArgs.hasArg(options::OPT_nostdinc))
+    return;
+
+  if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
+    SmallString<128> P(D.ResourceDir);
+    llvm::sys::path::append(P, "include");
+    addSystemInclude(DriverArgs, CC1Args, P);
+  }
+
+  if (DriverArgs.hasArg(options::OPT_nostdlibinc))
+    return;
+
+  // Check for configure-time C include directories.
+  StringRef CIncludeDirs(C_INCLUDE_DIRS);
+  if (CIncludeDirs != "") {
+    SmallVector<StringRef, 5> dirs;
+    CIncludeDirs.split(dirs, ":");
+    for (StringRef dir : dirs) {
+      StringRef Prefix =
+          llvm::sys::path::is_absolute(dir) ? StringRef(SysRoot) : "";
+      addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
+    }
+    return;
+  }
+
+  addExternCSystemInclude(DriverArgs, CC1Args,
+                          SysRoot + "/usr/include/" +
+                              getMultiarchTriple(Triple));
+  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
+  addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
+}
+
+void OHOS::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
+                                        ArgStringList &CC1Args) const {
+  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
+      DriverArgs.hasArg(options::OPT_nostdincxx))
+    return;
+
+  switch (GetCXXStdlibType(DriverArgs)) {
+  case ToolChain::CST_Libcxx: {
+    std::string IncPath = makePath({getDriver().Dir, "..", "include"});
+    std::string IncTargetPath =
+        makePath({IncPath, getMultiarchTriple(getTriple()), "c++", "v1"});
+    if (getVFS().exists(IncTargetPath)) {
+      addSystemInclude(DriverArgs, CC1Args, makePath({IncPath, "c++", "v1"}));
+      addSystemInclude(DriverArgs, CC1Args, IncTargetPath);
+    }
+    break;
+  }
+
+  default:
+    llvm_unreachable("invalid stdlib name");
+  }
+}
+
+void OHOS::AddCXXStdlibLibArgs(const ArgList &Args,
+                                  ArgStringList &CmdArgs) const {
+  switch (GetCXXStdlibType(Args)) {
+  case ToolChain::CST_Libcxx:
+    CmdArgs.push_back("-lc++");
+    CmdArgs.push_back("-lc++abi");
+    CmdArgs.push_back("-lunwind");
+    break;
+
+  case ToolChain::CST_Libstdcxx:
+    llvm_unreachable("invalid stdlib name");
+  }
+}
+
+std::string OHOS::computeSysRoot() const {
+  std::string SysRoot =
+      !getDriver().SysRoot.empty()
+          ? getDriver().SysRoot
+          : makePath({getDriver().getInstalledDir(), "..", "..", "sysroot"});
+  if (!llvm::sys::fs::exists(SysRoot))
+    return std::string();
+
+  std::string ArchRoot = makePath({SysRoot, getMultiarchTriple(getTriple())});
+  return llvm::sys::fs::exists(ArchRoot) ? ArchRoot : SysRoot;
+}
+
+ToolChain::path_list OHOS::getRuntimePaths() const {
+  SmallString<128> P;
+  path_list Paths;
+  const Driver &D = getDriver();
+  const llvm::Triple &Triple = getTriple();
+
+  // First try the triple passed to driver as --target=<triple>.
+  P.assign(D.ResourceDir);
+  llvm::sys::path::append(P, "lib", D.getTargetTriple(), SelectedMultilib.gccSuffix());
+  Paths.push_back(P.c_str());
+
+  // Second try the normalized triple.
+  P.assign(D.ResourceDir);
+  llvm::sys::path::append(P, "lib", Triple.str(), SelectedMultilib.gccSuffix());
+  Paths.push_back(P.c_str());
+
+  // Third try the effective triple.
+  P.assign(D.ResourceDir);
+  std::string SysRoot = computeSysRoot();
+  llvm::sys::path::append(P, "lib", getMultiarchTriple(Triple),
+                          SelectedMultilib.gccSuffix());
+  Paths.push_back(P.c_str());
+
+  return Paths;
+}
+
+std::string OHOS::getDynamicLinker(const ArgList &Args) const {
+  const llvm::Triple &Triple = getTriple();
+  const llvm::Triple::ArchType Arch = getArch();
+
+  assert(Triple.isMusl());
+  std::string ArchName;
+  bool IsArm = false;
+
+  switch (Arch) {
+  case llvm::Triple::arm:
+  case llvm::Triple::thumb:
+    ArchName = "arm";
+    IsArm = true;
+    break;
+  case llvm::Triple::armeb:
+  case llvm::Triple::thumbeb:
+    ArchName = "armeb";
+    IsArm = true;
+    break;
+  default:
+    ArchName = Triple.getArchName().str();
+  }
+  if (IsArm &&
+      (tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard))
+    ArchName += "hf";
+
+  return "/lib/ld-musl-" + ArchName + ".so.1";
+}
+
+std::string OHOS::getCompilerRT(const ArgList &Args, StringRef Component,
+                                FileType Type) const {
+  SmallString<128> Path(getDriver().ResourceDir);
+  llvm::sys::path::append(Path, "lib", getMultiarchTriple(getTriple()),
+                          SelectedMultilib.gccSuffix());
+  const char *Prefix =
+      Type == ToolChain::FT_Object ? "" : "lib";
+  const char *Suffix;
+  switch (Type) {
+  case ToolChain::FT_Object:
+    Suffix = ".o";
+    break;
+  case ToolChain::FT_Static:
+    Suffix = ".a";
+    break;
+  case ToolChain::FT_Shared:
+    Suffix = ".so";
+    break;
+  }
+  llvm::sys::path::append(
+      Path, Prefix + Twine("clang_rt.") + Component + Suffix);
+  return static_cast<std::string>(Path.str());
+}
+
+void OHOS::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const {
+  CmdArgs.push_back("-z");
+  CmdArgs.push_back("now");
+  CmdArgs.push_back("-z");
+  CmdArgs.push_back("relro");
+  CmdArgs.push_back("-z");
+  CmdArgs.push_back("max-page-size=4096");
+  // .gnu.hash section is not compatible with the MIPS target
+  if (getArch() != llvm::Triple::mipsel)
+    CmdArgs.push_back("--hash-style=both");
+#ifdef ENABLE_LINKER_BUILD_ID
+  CmdArgs.push_back("--build-id");
+#endif
+  CmdArgs.push_back("--enable-new-dtags");
+}
+
+SanitizerMask OHOS::getSupportedSanitizers() const {
+  SanitizerMask Res = ToolChain::getSupportedSanitizers();
+  Res |= SanitizerKind::Address;
+  Res |= SanitizerKind::PointerCompare;
+  Res |= SanitizerKind::PointerSubtract;
+  Res |= SanitizerKind::Fuzzer;
+  Res |= SanitizerKind::FuzzerNoLink;
+  Res |= SanitizerKind::Memory;
+  Res |= SanitizerKind::Vptr;
+  Res |= SanitizerKind::SafeStack;
+  Res |= SanitizerKind::Scudo;
+  // TODO: kASAN for liteos ??
+  // TODO: Support TSAN and HWASAN and update mask.
+  return Res;
+}
+
+// TODO: Make a base class for Linux and OHOS and move this there.
+void OHOS::addProfileRTLibs(const llvm::opt::ArgList &Args,
+                             llvm::opt::ArgStringList &CmdArgs) const {
+  // Add linker option -u__llvm_profile_runtime to cause runtime
+  // initialization module to be linked in.
+  if (needsProfileRT(Args))
+    CmdArgs.push_back(Args.MakeArgString(
+        Twine("-u", llvm::getInstrProfRuntimeHookVarName())));
+  ToolChain::addProfileRTLibs(Args, CmdArgs);
+}
+
+std::string OHOS::getArchSpecificLibPath() const {
+  llvm::Triple Triple = getTriple();
+  return makePath({getDriver().ResourceDir, "lib", getMultiarchTriple(Triple)});
+}
+
+ToolChain::UnwindLibType OHOS::GetUnwindLibType(const llvm::opt::ArgList &Args) const {
+  if (const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ))
+    return Generic_ELF::GetUnwindLibType(Args);
+  return GetDefaultUnwindLibType();
+}
diff --git a/clang/test/CodeGen/aarch64-fix-cortex-a53-835769.c b/clang/test/CodeGen/aarch64-fix-cortex-a53-835769.c
--- a/clang/test/CodeGen/aarch64-fix-cortex-a53-835769.c
+++ b/clang/test/CodeGen/aarch64-fix-cortex-a53-835769.c
@@ -7,6 +7,8 @@
 
 // RUN: %clang -O3 -target aarch64-android-eabi %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
+// RUN: %clang -O3 -target aarch64-linux-ohos %s -S -o- \
+// RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
 // RUN: %clang -O3 -target aarch64-android-eabi -mfix-cortex-a53-835769 %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
 // RUN: %clang -O3 -target aarch64-android-eabi -mno-fix-cortex-a53-835769 %s -S -o- \
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/bin/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/bin/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/include/c++/v1/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/include/c++/v1/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_soft/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_soft/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_hard_neon-vfpv4/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_hard_neon-vfpv4/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_soft/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_soft/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_softfp_neon-vfpv4/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/c++/a7_softfp_neon-vfpv4/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/libc++.so b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/arm-liteos-ohos/libc++.so
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/.keep
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/.keep
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/clang_rt.crtbegin.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/clang_rt.crtbegin.o
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/clang_rt.crtend.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/clang_rt.crtend.o
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.builtins.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.builtins.a
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.profile.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.profile.a
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/.keep
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/clang_rt.crtbegin.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/clang_rt.crtbegin.o
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/clang_rt.crtend.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/clang_rt.crtend.o
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/libclang_rt.builtins.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/libclang_rt.builtins.a
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/libclang_rt.profile.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_soft/libclang_rt.profile.a
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/.keep b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/.keep
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/clang_rt.crtbegin.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/clang_rt.crtbegin.o
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/clang_rt.crtend.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/clang_rt.crtend.o
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diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.builtins.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.builtins.a
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.profile.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.profile.a
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/clang_rt.crtbegin.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/clang_rt.crtbegin.o
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/clang_rt.crtend.o b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/clang_rt.crtend.o
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/libclang_rt.builtins.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/libclang_rt.builtins.a
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/libclang_rt.profile.a b/clang/test/Driver/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z/lib/arm-liteos-ohos/libclang_rt.profile.a
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/include/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/include/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/include/arm-liteos-ohos/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/include/arm-liteos-ohos/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_soft/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_soft/.keep
new file mode 100644
diff --git a/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/.keep b/clang/test/Driver/Inputs/ohos_native_tree/sysroot/usr/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/.keep
new file mode 100644
diff --git a/clang/test/Driver/ohos.c b/clang/test/Driver/ohos.c
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/ohos.c
@@ -0,0 +1,240 @@
+// RUN: %clang %s -### -no-canonical-prefixes --target=arm-liteos \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=lld -march=armv7-a 2>&1 \
+// RUN:     | FileCheck -check-prefixes=CHECK,CHECK-ARM %s
+// RUN: %clang %s -### -no-canonical-prefixes --target=arm-liteos \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=lld -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=soft 2>&1 \
+// RUN:     | FileCheck -check-prefixes=CHECK,CHECK-ARM-A7-SOFT %s
+// CHECK: {{.*}}clang{{.*}}" "-cc1"
+// CHECK-NOT: "--mrelax-relocations"
+// CHECK-NOT: "-munwind-tables"
+// CHECK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK: "-internal-externc-isystem" "[[SYSROOT]]{{/|\\\\}}include"
+// CHECK-NOT: "-fsanitize=safe-stack"
+// CHECK-NOT: "-stack-protector" "2"
+// CHECK-NOT: "-fno-common"
+// CHECK: {{.*}}ld.lld{{.*}}" "--sysroot=[[SYSROOT]]"
+// CHECK-NOT: "--sysroot=[[SYSROOT]]"
+// CHECK: "-pie"
+// CHECK-NOT: "--build-id"
+// CHECK: "--hash-style=both"
+// CHECK: "-dynamic-linker" "/lib/ld-musl-arm.so.1"
+// CHECK: Scrt1.o
+// CHECK: crti.o
+// CHECK: clang_rt.crtbegin.o
+// CHECK-ARM: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/"
+// CHECK-ARM-A7-SOFT: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_soft"
+// CHECK-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-ARM-A7-SOFT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos/a7_soft{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK: "-lc"
+// CHECK: clang_rt.crtend.o
+// CHECK: crtn.o
+
+// RUN: %clang %s -### --target=arm-liteos -rtlib=libgcc -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RTLIB
+// CHECK-RTLIB: error: invalid runtime library name in argument '-rtlib=libgcc'
+
+// RUN: %clang %s -### --target=arm-liteos -static -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-STATIC
+// CHECK-STATIC: "-static"
+// CHECK-STATIC-NOT: "-Bdynamic"
+// CHECK-STATIC: "-l:libunwind.a"
+// CHECK-STATIC: "-lc"
+
+// RUN: %clang %s -### --target=arm-liteos -shared -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-SHARED
+// CHECK-SHARED-NOT: "-pie"
+// CHECK-SHARED: "-shared"
+// CHECK-SHARED: "-lc"
+// CHECK-SHARED: "-l:libunwind.a"
+
+// RUN: %clang %s -### --target=arm-linux-ohos -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RUNTIME
+// RUN: %clang %s -### --target=aarch64-linux-ohos -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RUNTIME
+// RUN: %clang %s -### --target=mipsel-linux-ohos -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RUNTIME
+// RUN: %clang %s -### --target=x86_64-linux-ohos -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RUNTIME
+// CHECK-RUNTIME: "{{.*}}/libclang_rt.builtins.a"
+// CHECK-RUNTIME: "-l:libunwind.a"
+// CHECK-LIBM: "-lm"
+
+// RUN: %clang %s -### --target=arm-liteos -r -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-RELOCATABLE
+// CHECK-RELOCATABLE-NOT: "-pie"
+// CHECK-RELOCATABLE-NOT: "--build-id"
+// CHECK-RELOCATABLE: "-r"
+
+// RUN: %clang %s -### --target=arm-liteos -nodefaultlibs -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NODEFAULTLIBS
+// CHECK-NODEFAULTLIBS: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NODEFAULTLIBS-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NODEFAULTLIBS-NOT: "-lc"
+
+// RUN: %clang %s -### --target=arm-liteos -nostdlib -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOSTDLIB
+// CHECK-NOSTDLIB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NOSTDLIB-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOSTDLIB-NOT: "-lc"
+
+// RUN: %clang %s -### --target=arm-liteos -nolibc -fuse-ld=lld 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOLIBC
+// CHECK-NOLIBC: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-NOLIBC: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK-NOLIBC-NOT: "-lc"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=safe-stack 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-SAFESTACK
+// CHECK-SAFESTACK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-SAFESTACK: "-fsanitize=safe-stack"
+// CHECK-SAFESTACK: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.safestack.a"
+// CHECK-SAFESTACK: "__safestack_init"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=address 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-ASAN-ARM
+// CHECK-ASAN-ARM: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-ASAN-ARM: "-fsanitize=address"
+// CHECK-ASAN-ARM: "-fsanitize-address-use-after-scope"
+// CHECK-ASAN-ARM: "-dynamic-linker" "/lib/ld-musl-arm.so.1"
+// CHECK-ASAN-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.asan.a"
+// CHECK-ASAN-ARM-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.asan-preinit.a"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=address -fPIC -shared 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -shared-libsan \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-ASAN-SHARED
+// CHECK-ASAN-SHARED: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-ASAN-SHARED: "-fsanitize=address"
+// CHECK-ASAN-SHARED: "-fsanitize-address-use-after-scope"
+// CHECK-ASAN-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.asan.so"
+// CHECK-ASAN-SHARED-NOT: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.asan-preinit.a"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=fuzzer 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-FUZZER-ARM
+// CHECK-FUZZER-ARM: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-FUZZER-ARM: "-fsanitize=fuzzer,fuzzer-no-link"
+// CHECK-FUZZER-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.fuzzer.a"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=scudo 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-ARM
+// CHECK-SCUDO-ARM: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-SCUDO-ARM: "-fsanitize=scudo"
+// CHECK-SCUDO-ARM: "-pie"
+// CHECK-SCUDO-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.scudo_standalone.a"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fsanitize=scudo -fPIC -shared 2>&1 \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -shared-libsan \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-SCUDO-SHARED
+// CHECK-SCUDO-SHARED: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-SCUDO-SHARED: "-fsanitize=scudo"
+// CHECK-SCUDO-SHARED: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.scudo_standalone.so"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -fxray-instrument -fxray-modes=xray-basic \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-XRAY-ARM
+// CHECK-XRAY-ARM: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-XRAY-ARM: "-fxray-instrument"
+// CHECK-XRAY-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.xray.a"
+// CHECK-XRAY-ARM: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.xray-basic.a"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -O3 -flto -mcpu=cortex-a53 2>&1 \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-LTO
+// CHECK-LTO: "-plugin-opt=mcpu=cortex-a53"
+// CHECK-LTO: "-plugin-opt=O3"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -flto=thin -flto-jobs=8 -mcpu=cortex-a7 2>&1 \
+// RUN:     -fuse-ld=lld \
+// RUN:     | FileCheck %s -check-prefix=CHECK-THINLTO
+// CHECK-THINLTO: "-plugin-opt=mcpu=cortex-a7"
+// CHECK-THINLTO: "-plugin-opt=thinlto"
+// CHECK-THINLTO: "-plugin-opt=jobs=8"
+
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mfloat-abi=soft 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM
+// RUN: %clang %s -### --target=arm-liteos \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=soft 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM-A7-SOFT
+// RUN: %clang %s -### --target=arm-liteos  \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM-A7-SOFTFP
+// RUN: %clang %s -### --target=arm-liteos  \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-HF,CHECK-MULTILIB-ARM-A7-HARD
+// CHECK-MULTILIB: {{.*}}clang{{.*}}" "-cc1"
+// CHECK-MULTILIB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-MULTILIB: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-MULTILIB: {{.*}}ld.lld{{.*}}" "--sysroot=[[SYSROOT]]"
+// CHECK-MULTILIB-SF: "-dynamic-linker" "/lib/ld-musl-arm.so.1"
+// CHECK-MULTILIB-HF: "-dynamic-linker" "/lib/ld-musl-armhf.so.1"
+
+// CHECK-MULTILIB-ARM: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/"
+
+// CHECK-MULTILIB-ARM-A7-SOFT: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_soft"
+
+// CHECK-MULTILIB-ARM-A7-SOFTFP: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4"
+
+// CHECK-MULTILIB-ARM-A7-HARD: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_hard_neon-vfpv4"
+
+// CHECK-MULTILIB-ARM: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-SOFT: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_soft/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-SOFTFP: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-HARD: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.builtins.a"
+
+// RUN: %clang %s -### -no-canonical-prefixes --target=arm-linux-ohos -fprofile-instr-generate -v \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=lld -march=armv7-a 2>&1 \
+// RUN:     | FileCheck -check-prefixes=CHECK-PROFILE-RTLIB %s
+
+// CHECK-PROFILE-RTLIB: -u__llvm_profile_runtime
+// CHECK-PROFILE-RTLIB: libclang_rt.profile
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=arm64-linux-ohos -pthread \
+// RUN:     --gcc-toolchain="" \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -shared \
+// RUN:   | FileCheck --check-prefix=CHECK-OHOS-PTHREAD %s
+
+// CHECK-OHOS-PTHREAD-NOT: -lpthread
+
diff --git a/clang/test/Driver/ohos.cpp b/clang/test/Driver/ohos.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/ohos.cpp
@@ -0,0 +1,121 @@
+// RUN: %clangxx %s -### -no-canonical-prefixes --target=arm-liteos -march=armv7-a \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=lld 2>&1 | FileCheck %s
+// CHECK: {{.*}}clang{{.*}}" "-cc1"
+// CHECK: "-triple" "armv7-unknown-liteos-ohos"
+// CHECK-NOT: "-fuse-init-array"
+// CHECK: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK: "-internal-externc-isystem" "[[SYSROOT]]{{/|\\\\}}include"
+// CHECK: {{.*}}ld.lld{{.*}}" "--sysroot=[[SYSROOT]]"
+// CHECK: "-pie"
+// CHECK-NOT: "--build-id"
+// CHECK: "-dynamic-linker" "/lib/ld-musl-arm.so.1"
+// CHECK: Scrt1.o
+// CHECK: crti.o
+// CHECK: clang_rt.crtbegin.o
+// CHECK: "-L{{.*[/\\]}}lib/arm-liteos-ohos/"
+// CHECK-NOT: "--push-state"
+// CHECK-NOT: "--as-needed"
+// CHECK: "-lc++"
+// CHECK: "-lm"
+// CHECK-NOT: "--pop-state"
+// CHECK: "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}libclang_rt.builtins.a"
+// CHECK: "-lc"
+// CHECK: clang_rt.crtend.o
+// CHECK: crtn.o
+
+// RUN: %clangxx %s -### --target=arm-unknown-liteos -stdlib=libstdc++ \
+// RUN:     -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-STDLIB
+// CHECK-STDLIB: error: invalid library name in argument '-stdlib=libstdc++'
+
+// RUN: %clangxx %s -### --target=arm-unknown-liteos -static-libstdc++ \
+// RUN:     -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-STATIC
+// CHECK-STATIC-NOT: "--push-state"
+// CHECK-STATIC-NOT: "--as-needed"
+// CHECK-STATIC: "-Bstatic"
+// CHECK-STATIC: "-lc++"
+// CHECK-STATIC: "-Bdynamic"
+// CHECK-STATIC: "-lm"
+// CHECK-STATIC-NOT: "--pop-state"
+// CHECK-STATIC: "-lc"
+
+// RUN: %clangxx %s -### --target=arm-unknown-liteos -static \
+// RUN:     -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-STATIC1
+// CHECK-STATIC1-NOT: "-fuse-init-array"
+// CHECK-STATIC1: "-static"
+// CHECK-STATIC1: "-lc++"
+// CHECK-STATIC1: "-lc++abi"
+// CHECK-STATIC1: "-lunwind"
+// CHECK-STATIC1: "-lm"
+// CHECK-STATIC1: "-lc"
+
+// RUN: %clangxx %s -### --target=arm-unknown-liteos -march=armv7-a -mfloat-abi=soft -static -fPIE -fPIC -fpic -pie \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-STATIC2
+// CHECK-STATIC2: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-STATIC2: {{.*}}ld.lld{{.*}}" "--sysroot=[[SYSROOT]]"
+// CHECK-STATIC2: "-static"
+// CHECK-STATIC2: "-lc++"
+// CHECK-STATIC2: "-lc++abi"
+// CHECK-STATIC2: "-lunwind"
+// CHECK-STATIC2: "-lm"
+// CHECK-STATIC2: "-lc"
+
+// RUN: %clangxx %s -### --target=arm-liteos -nostdlib++ -fuse-ld=lld 2>&1 \
+// RUN:     | FileCheck %s -check-prefix=CHECK-NOSTDLIBXX
+// CHECK-NOSTDLIBXX-NOT: "-lc++"
+// CHECK-NOSTDLIBXX: "-lm"
+// CHECK-NOSTDLIBXX: "-lc"
+
+// RUN: %clangxx %s -### --target=arm-liteos \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mfloat-abi=soft 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM
+// RUN: %clangxx %s -### --target=arm-liteos \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=soft 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM-A7-SOFT
+// RUN: %clangxx %s -### --target=arm-liteos  \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-SF,CHECK-MULTILIB-ARM-A7-SOFTFP
+// RUN: %clangxx %s -### --target=arm-liteos  \
+// RUN:     -ccc-install-dir %S/Inputs/ohos_native_tree/llvm/bin \
+// RUN:     -resource-dir=%S/Inputs/ohos_native_tree/llvm/lib/clang/x.y.z \
+// RUN:     --sysroot=%S/Inputs/ohos_native_tree/sysroot \
+// RUN:     -march=armv7-a -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 2>&1\
+// RUN:     | FileCheck %s -check-prefixes=CHECK-MULTILIB,CHECK-MULTILIB-HF,CHECK-MULTILIB-ARM-A7-HARD
+// CHECK-MULTILIB: {{.*}}clang{{.*}}" "-cc1"
+// CHECK-MULTILIB: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+// CHECK-MULTILIB: "-isysroot" "[[SYSROOT:[^"]+]]"
+// CHECK-MULTILIB: {{.*}}ld.lld{{.*}}" "--sysroot=[[SYSROOT]]"
+// CHECK-MULTILIB-SF: "-dynamic-linker" "/lib/ld-musl-arm.so.1"
+// CHECK-MULTILIB-HF: "-dynamic-linker" "/lib/ld-musl-armhf.so.1"
+
+// CHECK-MULTILIB-ARM: "-L{{.*}}{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}"
+// CHECK-MULTILIB-ARM: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/"
+
+// CHECK-MULTILIB-ARM-A7-SOFT: "-L{{.*}}{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}a7_soft"
+// CHECK-MULTILIB-ARM-A7-SOFT: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_soft"
+
+// CHECK-MULTILIB-ARM-A7-SOFTFP: "-L{{.*}}{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}a7_softfp_neon-vfpv4"
+// CHECK-MULTILIB-ARM-A7-SOFTFP: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4"
+
+// CHECK-MULTILIB-ARM-A7-HARD: "-L{{.*}}{{/|\\\\}}..{{/|\\\\}}lib{{/|\\\\}}arm-liteos-ohos{{/|\\\\}}a7_hard_neon-vfpv4"
+// CHECK-MULTILIB-ARM-A7-HARD: "-L[[SYSROOT]]/usr/lib/arm-liteos-ohos/a7_hard_neon-vfpv4"
+
+// CHECK-MULTILIB-ARM: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-SOFT: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_soft/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-SOFTFP: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_softfp_neon-vfpv4/libclang_rt.builtins.a"
+// CHECK-MULTILIB-ARM-A7-HARD: "[[RESOURCE_DIR]]/lib/arm-liteos-ohos/a7_hard_neon-vfpv4/libclang_rt.builtins.a"
diff --git a/clang/test/Preprocessor/ohos.c b/clang/test/Preprocessor/ohos.c
new file mode 100644
--- /dev/null
+++ b/clang/test/Preprocessor/ohos.c
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=arm-linux-ohos < /dev/null | FileCheck %s -match-full-lines -check-prefix=ARM-OHOS-CXX
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=aarch64-linux-ohos < /dev/null | FileCheck %s -match-full-lines -check-prefix=ARM64-OHOS-CXX
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=riscv64-linux-ohos < /dev/null | FileCheck %s -match-full-lines -check-prefix=RISCV64-OHOS-CXX
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=mipsel-linux-ohos < /dev/null | FileCheck %s -match-full-lines -check-prefix=MIPSEL-OHOS-CXX
+// RUN: %clang_cc1 -x c++ -E -dM -ffreestanding -triple=x86_64-linux-ohos < /dev/null | FileCheck %s -match-full-lines -check-prefix=X86_64-OHOS-CXX
+// RUN: %clang_cc1 -E -dM -ffreestanding -triple=arm-linux-ohos < /dev/null | FileCheck %s -check-prefix=OHOS-DEFS
+
+// ARM-OHOS-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8U
+// ARM64-OHOS-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
+// RISCV64-OHOS-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
+// MIPSEL-OHOS-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8U
+// X86_64-OHOS-CXX: #define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 16UL
+// OHOS-DEFS: __OHOS_FAMILY__
+// OHOS-DEFS: __OHOS__
+// OHOS-DEFS-NOT: __OHOS__