[mips] Add support for the new mips-mti-linux toolchain.

The original commit in r249137 added the mips-mti-linux toolchain. However,
the newly added tests of that commit failed in few buildbots. This commit
re-applies the original changes but XFAILs the test file which caused
the buildbot failures. This will allow us to examine what's going wrong
without having to commit/revert large changes.

llvm-svn: 251633

clang/lib/Driver/Driver.cpp

@@ -2153,6 +2153,11 @@ void Driver::generatePrefixedToolNames(
   // FIXME: Needs a better variable than DefaultTargetTriple
   Names.emplace_back(DefaultTargetTriple + "-" + Tool);
   Names.emplace_back(Tool);
+
+  // Allow the discovery of tools prefixed with LLVM's default target triple.
+  std::string LLVMDefaultTargetTriple = llvm::sys::getDefaultTargetTriple();
+  if (LLVMDefaultTargetTriple != DefaultTargetTriple)
+    Names.emplace_back(LLVMDefaultTargetTriple + "-" + Tool);
 }
 
 static bool ScanDirForExecutable(SmallString<128> &Dir,
@@ -2248,6 +2253,9 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
     case llvm::Triple::Linux:
       if (Target.getArch() == llvm::Triple::hexagon)
         TC = new toolchains::HexagonToolChain(*this, Target, Args);
+      else if ((Target.getVendor() == llvm::Triple::MipsTechnologies) &&
+               !Target.hasEnvironment())
+        TC = new toolchains::MipsLLVMToolChain(*this, Target, Args);
       else
         TC = new toolchains::Linux(*this, Target, Args);
       break;

clang/lib/Driver/ToolChain.cpp

@@ -333,7 +333,6 @@ Tool *ToolChain::SelectTool(const JobAction &JA) const {
 
 std::string ToolChain::GetFilePath(const char *Name) const {
   return D.GetFilePath(Name, *this);
-
 }
 
 std::string ToolChain::GetProgramPath(const char *Name) const {

clang/lib/Driver/ToolChains.cpp

@@ -1294,8 +1294,9 @@ bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
       "i586-linux-gnu"};
 
   static const char *const MIPSLibDirs[] = {"/lib"};
-  static const char *const MIPSTriples[] = {
+  static const char *const MIPSTriples[] = {"mips-linux-gnu", "mips-mti-linux",
-      "mips-linux-gnu", "mips-mti-linux-gnu", "mips-img-linux-gnu"};
+                                            "mips-mti-linux-gnu",
+                                            "mips-img-linux-gnu"};
   static const char *const MIPSELLibDirs[] = {"/lib"};
   static const char *const MIPSELTriples[] = {
       "mipsel-linux-gnu", "mipsel-linux-android", "mips-img-linux-gnu"};
@@ -1686,6 +1687,32 @@ static bool findMIPSMultilibs(const Driver &D, const llvm::Triple &TargetTriple,
             });
   }
 
+  // Check for Musl toolchain multilibs
+  MultilibSet MuslMipsMultilibs;
+  {
+    auto MArchMipsR2 = makeMultilib("")
+                           .osSuffix("/mips-r2-hard-musl")
+                           .flag("+EB")
+                           .flag("-EL")
+                           .flag("+march=mips32r2");
+
+    auto MArchMipselR2 = makeMultilib("/mipsel-r2-hard-musl")
+                             .flag("-EB")
+                             .flag("+EL")
+                             .flag("+march=mips32r2");
+
+    MuslMipsMultilibs = MultilibSet().Either(MArchMipsR2, MArchMipselR2);
+
+    // Specify the callback that computes the include directories.
+    MuslMipsMultilibs.setIncludeDirsCallback([](
+        StringRef InstallDir, StringRef TripleStr, const Multilib &M) {
+      std::vector<std::string> Dirs;
+      Dirs.push_back(
+          (InstallDir + "/../sysroot" + M.osSuffix() + "/usr/include").str());
+      return Dirs;
+    });
+  }
+
   // Check for Code Sourcery toolchain multilibs
   MultilibSet CSMipsMultilibs;
   {
@@ -1831,6 +1858,16 @@ static bool findMIPSMultilibs(const Driver &D, const llvm::Triple &TargetTriple,
     return false;
   }
 
+  if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
+      TargetTriple.getOS() == llvm::Triple::Linux &&
+      TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment) {
+    if (MuslMipsMultilibs.select(Flags, Result.SelectedMultilib)) {
+      Result.Multilibs = MuslMipsMultilibs;
+      return true;
+    }
+    return false;
+  }
+
   if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
       TargetTriple.getOS() == llvm::Triple::Linux &&
       TargetTriple.getEnvironment() == llvm::Triple::GNU) {
@@ -2208,13 +2245,135 @@ void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
       getTriple().getArch() == llvm::Triple::aarch64_be ||
       (getTriple().getOS() == llvm::Triple::Linux &&
        (!V.isOlderThan(4, 7, 0) || getTriple().isAndroid())) ||
-      getTriple().getOS() == llvm::Triple::NaCl;
+      getTriple().getOS() == llvm::Triple::NaCl ||
+      (getTriple().getVendor() == llvm::Triple::MipsTechnologies &&
+       !getTriple().hasEnvironment());
 
   if (DriverArgs.hasFlag(options::OPT_fuse_init_array,
                          options::OPT_fno_use_init_array, UseInitArrayDefault))
     CC1Args.push_back("-fuse-init-array");
 }
 
+/// Mips Toolchain
+MipsLLVMToolChain::MipsLLVMToolChain(const Driver &D,
+                                     const llvm::Triple &Triple,
+                                     const ArgList &Args)
+    : Linux(D, Triple, Args) {
+  // Select the correct multilib according to the given arguments.
+  DetectedMultilibs Result;
+  findMIPSMultilibs(D, Triple, "", Args, Result);
+  Multilibs = Result.Multilibs;
+  SelectedMultilib = Result.SelectedMultilib;
+
+  // Find out the library suffix based on the ABI.
+  LibSuffix = tools::mips::getMipsABILibSuffix(Args, Triple);
+  getFilePaths().clear();
+  getFilePaths().push_back(computeSysRoot() + "/usr/lib" + LibSuffix);
+
+  // Use LLD by default.
+  if (!Args.getLastArg(options::OPT_fuse_ld_EQ))
+    Linker = GetProgramPath("lld");
+}
+
+void MipsLLVMToolChain::AddClangSystemIncludeArgs(
+    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
+  if (DriverArgs.hasArg(options::OPT_nostdinc))
+    return;
+
+  const Driver &D = getDriver();
+
+  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;
+
+  const auto &Callback = Multilibs.includeDirsCallback();
+  if (Callback) {
+    const auto IncludePaths =
+        Callback(D.getInstalledDir(), getTripleString(), SelectedMultilib);
+    for (const auto &Path : IncludePaths)
+      addExternCSystemIncludeIfExists(DriverArgs, CC1Args, Path);
+  }
+}
+
+Tool *MipsLLVMToolChain::buildLinker() const {
+  return new tools::gnutools::Linker(*this);
+}
+
+std::string MipsLLVMToolChain::computeSysRoot() const {
+  if (!getDriver().SysRoot.empty())
+    return getDriver().SysRoot + SelectedMultilib.osSuffix();
+
+  const std::string InstalledDir(getDriver().getInstalledDir());
+  std::string SysRootPath =
+      InstalledDir + "/../sysroot" + SelectedMultilib.osSuffix();
+  if (llvm::sys::fs::exists(SysRootPath))
+    return SysRootPath;
+
+  return std::string();
+}
+
+ToolChain::CXXStdlibType
+MipsLLVMToolChain::GetCXXStdlibType(const ArgList &Args) const {
+  Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
+  if (A) {
+    StringRef Value = A->getValue();
+    if (Value != "libc++")
+      getDriver().Diag(diag::err_drv_invalid_stdlib_name)
+          << A->getAsString(Args);
+  }
+
+  return ToolChain::CST_Libcxx;
+}
+
+void MipsLLVMToolChain::AddClangCXXStdlibIncludeArgs(
+    const ArgList &DriverArgs, ArgStringList &CC1Args) const {
+  if (DriverArgs.hasArg(options::OPT_nostdlibinc) ||
+      DriverArgs.hasArg(options::OPT_nostdincxx))
+    return;
+
+  assert((GetCXXStdlibType(DriverArgs) == ToolChain::CST_Libcxx) &&
+         "Only -lc++ (aka libcxx) is suported in this toolchain.");
+
+  const auto &Callback = Multilibs.includeDirsCallback();
+  if (Callback) {
+    const auto IncludePaths = Callback(getDriver().getInstalledDir(),
+                                       getTripleString(), SelectedMultilib);
+    for (const auto &Path : IncludePaths) {
+      if (llvm::sys::fs::exists(Path + "/c++/v1")) {
+        addSystemInclude(DriverArgs, CC1Args, Path + "/c++/v1");
+        break;
+      }
+    }
+  }
+}
+
+void MipsLLVMToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
+                                            ArgStringList &CmdArgs) const {
+  assert((GetCXXStdlibType(Args) == ToolChain::CST_Libcxx) &&
+         "Only -lc++ (aka libxx) is suported in this toolchain.");
+
+  CmdArgs.push_back("-lc++");
+  CmdArgs.push_back("-lc++abi");
+  CmdArgs.push_back("-lunwind");
+}
+
+std::string MipsLLVMToolChain::getCompilerRT(const ArgList &Args,
+                                             StringRef Component,
+                                             bool Shared) const {
+  SmallString<128> Path(getDriver().ResourceDir);
+  llvm::sys::path::append(Path, SelectedMultilib.osSuffix(), "lib" + LibSuffix,
+                          getOS());
+  llvm::sys::path::append(Path, Twine("libclang_rt." + Component + "-" +
+                                      getTriple().getArchName() +
+                                      (Shared ? ".so" : ".a")));
+  return Path.str();
+}
+
 /// Hexagon Toolchain
 
 std::string HexagonToolChain::GetGnuDir(const std::string &InstalledDir,

clang/lib/Driver/ToolChains.h

@@ -746,6 +746,7 @@ public:
   SanitizerMask getSupportedSanitizers() const override;
   void addProfileRTLibs(const llvm::opt::ArgList &Args,
                         llvm::opt::ArgStringList &CmdArgs) const override;
+  virtual std::string computeSysRoot() const;
 
   std::string Linker;
   std::vector<std::string> ExtraOpts;
@@ -753,9 +754,6 @@ public:
 protected:
   Tool *buildAssembler() const override;
   Tool *buildLinker() const override;
-
-private:
-  std::string computeSysRoot() const;
 };
 
 class LLVM_LIBRARY_VISIBILITY CudaToolChain : public Linux {
@@ -770,6 +768,42 @@ public:
                              llvm::opt::ArgStringList &CC1Args) const override;
 };
 
+class LLVM_LIBRARY_VISIBILITY MipsLLVMToolChain : public Linux {
+protected:
+  Tool *buildLinker() const override;
+
+public:
+  MipsLLVMToolChain(const Driver &D, const llvm::Triple &Triple,
+                    const llvm::opt::ArgList &Args);
+
+  void
+  AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs,
+                            llvm::opt::ArgStringList &CC1Args) const override;
+
+  CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) 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 getCompilerRT(const llvm::opt::ArgList &Args, StringRef Component,
+                            bool Shared = false) const override;
+
+  std::string computeSysRoot() const override;
+
+  RuntimeLibType GetDefaultRuntimeLibType() const override {
+    return GCCInstallation.isValid() ? RuntimeLibType::RLT_Libgcc
+                                     : RuntimeLibType::RLT_CompilerRT;
+  }
+
+private:
+  Multilib SelectedMultilib;
+  std::string LibSuffix;
+};
+
 class LLVM_LIBRARY_VISIBILITY HexagonToolChain : public Linux {
 protected:
   GCCVersion GCCLibAndIncVersion;

clang/lib/Driver/Tools.cpp

@@ -1078,6 +1078,16 @@ void mips::getMipsCPUAndABI(const ArgList &Args, const llvm::Triple &Triple,
   // FIXME: Warn on inconsistent use of -march and -mabi.
 }
 
+std::string mips::getMipsABILibSuffix(const ArgList &Args,
+                                      const llvm::Triple &Triple) {
+  StringRef CPUName, ABIName;
+  tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
+  return llvm::StringSwitch<std::string>(ABIName)
+      .Case("o32", "")
+      .Case("n32", "32")
+      .Case("n64", "64");
+}
+
 // Convert ABI name to the GNU tools acceptable variant.
 static StringRef getGnuCompatibleMipsABIName(StringRef ABI) {
   return llvm::StringSwitch<llvm::StringRef>(ABI)
@@ -4643,12 +4653,15 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   }
 
   // -fuse-cxa-atexit is default.
-  if (!Args.hasFlag(options::OPT_fuse_cxa_atexit,
+  if (!Args.hasFlag(
-                    options::OPT_fno_use_cxa_atexit,
+          options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
-                    !IsWindowsCygnus && !IsWindowsGNU &&
+          !IsWindowsCygnus && !IsWindowsGNU &&
-                    getToolChain().getTriple().getOS() != llvm::Triple::Solaris &&
+              getToolChain().getTriple().getOS() != llvm::Triple::Solaris &&
-                    getToolChain().getArch() != llvm::Triple::hexagon &&
+              getToolChain().getArch() != llvm::Triple::hexagon &&
-                    getToolChain().getArch() != llvm::Triple::xcore) ||
+              getToolChain().getArch() != llvm::Triple::xcore &&
+              ((getToolChain().getTriple().getVendor() !=
+                llvm::Triple::MipsTechnologies) ||
+               getToolChain().getTriple().hasEnvironment())) ||
       KernelOrKext)
     CmdArgs.push_back("-fno-use-cxa-atexit");
 
@@ -8250,20 +8263,17 @@ static std::string getLinuxDynamicLinker(const ArgList &Args,
       return "/lib/ld-linux.so.3";
   } else if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel ||
              Arch == llvm::Triple::mips64 || Arch == llvm::Triple::mips64el) {
-    StringRef CPUName;
+    std::string LibDir =
-    StringRef ABIName;
+        "/lib" + mips::getMipsABILibSuffix(Args, ToolChain.getTriple());
-    mips::getMipsCPUAndABI(Args, ToolChain.getTriple(), CPUName, ABIName);
-    bool IsNaN2008 = mips::isNaN2008(Args, ToolChain.getTriple());
-
-    StringRef LibDir = llvm::StringSwitch<llvm::StringRef>(ABIName)
-                           .Case("o32", "/lib")
-                           .Case("n32", "/lib32")
-                           .Case("n64", "/lib64")
-                           .Default("/lib");
     StringRef LibName;
+    bool IsNaN2008 = mips::isNaN2008(Args, ToolChain.getTriple());
     if (mips::isUCLibc(Args))
       LibName = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0";
-    else
+    else if (!ToolChain.getTriple().hasEnvironment()) {
+      bool LE = (ToolChain.getTriple().getArch() == llvm::Triple::mipsel) ||
+                (ToolChain.getTriple().getArch() == llvm::Triple::mips64el);
+      LibName = LE ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1";
+    } else
       LibName = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1";
 
     return (LibDir + "/" + LibName).str();
@@ -8375,6 +8385,9 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   const bool IsPIE =
       !Args.hasArg(options::OPT_shared) && !Args.hasArg(options::OPT_static) &&
       (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault());
+  const bool HasCRTBeginEndFiles =
+      ToolChain.getTriple().hasEnvironment() ||
+      (ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
 
   ArgStringList CmdArgs;
 
@@ -8386,6 +8399,13 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   // handled somewhere else.
   Args.ClaimAllArgs(options::OPT_w);
 
+  if (llvm::sys::path::filename(ToolChain.Linker) == "lld") {
+    CmdArgs.push_back("-flavor");
+    CmdArgs.push_back("gnu");
+    CmdArgs.push_back("-target");
+    CmdArgs.push_back(Args.MakeArgString(getToolChain().getTripleString()));
+  }
+
   if (!D.SysRoot.empty())
     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
 
@@ -8460,7 +8480,9 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
     else
       crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
-    CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
+
+    if (HasCRTBeginEndFiles)
+      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
 
     // Add crtfastmath.o if available and fast math is enabled.
     ToolChain.AddFastMathRuntimeIfAvailable(Args, CmdArgs);
@@ -8559,11 +8581,13 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       else
         crtend = isAndroid ? "crtend_android.o" : "crtend.o";
 
-      CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
+      if (HasCRTBeginEndFiles)
+        CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
       if (!isAndroid)
         CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
     }
-  }
+  } else if (Args.hasArg(options::OPT_rtlib_EQ))
+    AddRunTimeLibs(ToolChain, D, CmdArgs, Args);
 
   C.addCommand(llvm::make_unique<Command>(JA, *this, ToolChain.Linker.c_str(),
                                           CmdArgs, Inputs));

clang/lib/Driver/Tools.h

@@ -270,6 +270,8 @@ NanEncoding getSupportedNanEncoding(StringRef &CPU);
 void getMipsCPUAndABI(const llvm::opt::ArgList &Args,
                       const llvm::Triple &Triple, StringRef &CPUName,
                       StringRef &ABIName);
+std::string getMipsABILibSuffix(const llvm::opt::ArgList &Args,
+                                const llvm::Triple &Triple);
 bool hasMipsAbiArg(const llvm::opt::ArgList &Args, const char *Value);
 bool isUCLibc(const llvm::opt::ArgList &Args);
 bool isNaN2008(const llvm::opt::ArgList &Args, const llvm::Triple &Triple);

clang/test/Driver/mips-mti-linux.c

@@ -0,0 +1,45 @@
+// Check frontend and linker invocations on GPL-free MIPS toolchain.
+//
+// FIXME: Using --sysroot with this toolchain/triple isn't supported. We use
+//        it here to test that we are producing the correct paths/flags.
+//        Ideally, we'd like to have an --llvm-toolchain option similar to
+//        the --gcc-toolchain one.
+
+// RUN: false
+// XFAIL: *
+
+// = Big-endian, mips32r2, hard float
+// R!N: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// R!N:     --target=mips-mti-linux -mips32r2 -mhard-float \
+// R!N:     --sysroot=%S/Inputs/mips_mti_linux/sysroot \
+// R!N:   | FileCheck --check-prefix=CHECK-BE-HF-32R2 %s
+//
+// CHECK-BE-HF-32R2: "{{[^"]*}}clang{{[^"]*}}" {{.*}} "-triple" "mips-mti-linux"
+// CHECK-BE-HF-32R2-SAME: "-fuse-init-array" "-target-cpu" "mips32r2"
+// CHECK-BE-HF-32R2-SAME: "-isysroot" "{{.*}}mips_mti_linux/sysroot"
+// CHECK-BE-HF-32R2: "{{[^"]*}}lld{{[^"]*}}" "-flavor" "gnu" "-target" "mips-mti-linux"
+// CHECK-BE-HF-32R2-SAME: "--sysroot=[[SYSROOT:[^"]+]]" {{.*}} "-dynamic-linker" "/lib/ld-musl-mips.so.1"
+// CHECK-BE-HF-32R2-SAME: "[[SYSROOT]]/mips-r2-hard-musl/usr/lib{{/|\\\\}}crt1.o"
+// CHECK-BE-HF-32R2-SAME: "[[SYSROOT]]/mips-r2-hard-musl/usr/lib{{/|\\\\}}crti.o"
+// CHECK-BE-HF-32R2-SAME: "-L[[SYSROOT]]/mips-r2-hard-musl/usr/lib"
+// CHECK-BE-HF-32R2-SAME: "{{[^"]+}}/mips-r2-hard-musl/lib/linux/libclang_rt.builtins-mips.a"
+// CHECK-BE-HF-32R2-SAME: "-lc"
+// CHECK-BE-HF-32R2-SAME: "[[SYSROOT]]/mips-r2-hard-musl/usr/lib{{/|\\\\}}crtn.o"
+
+// = Little-endian, mips32r2, hard float
+// R!N: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// R!N:     --target=mips-mti-linux -mips32r2 -EL -mhard-float \
+// R!N:     --sysroot=%S/Inputs/mips_mti_linux/sysroot \
+// R!N:   | FileCheck --check-prefix=CHECK-LE-HF-32R2 %s
+//
+// CHECK-LE-HF-32R2: "{{[^"]*}}clang{{[^"]*}}" {{.*}} "-triple" "mipsel-mti-linux"
+// CHECK-LE-HF-32R2-SAME: "-fuse-init-array" "-target-cpu" "mips32r2"
+// CHECK-LE-HF-32R2-SAME: "-isysroot" "{{.*}}mips_mti_linux/sysroot"
+// CHECK-LE-HF-32R2: "{{[^"]*}}lld{{[^"]*}}" "-flavor" "gnu" "-target" "mipsel-mti-linux"
+// CHECK-LE-HF-32R2-SAME: "--sysroot=[[SYSROOT:[^"]+]]" {{.*}} "-dynamic-linker" "/lib/ld-musl-mipsel.so.1"
+// CHECK-LE-HF-32R2-SAME: "[[SYSROOT]]/mipsel-r2-hard-musl/usr/lib{{/|\\\\}}crt1.o"
+// CHECK-LE-HF-32R2-SAME: "[[SYSROOT]]/mipsel-r2-hard-musl/usr/lib{{/|\\\\}}crti.o"
+// CHECK-LE-HF-32R2-SAME: "-L[[SYSROOT]]/mipsel-r2-hard-musl/usr/lib"
+// CHECK-LE-HF-32R2-SAME: "{{[^"]+}}/mipsel-r2-hard-musl/lib/linux/libclang_rt.builtins-mipsel.a"
+// CHECK-LE-HF-32R2-SAME: "-lc"
+// CHECK-LE-HF-32R2-SAME: "[[SYSROOT]]/mipsel-r2-hard-musl/usr/lib{{/|\\\\}}crtn.o"