lib/Driver/ToolChains/Solaris.cpp - llvm-project/clang - Git at Google

 //===--- Solaris.cpp - Solaris 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 "Solaris.h"
 #include "CommonArgs.h"
 #include "Gnu.h"
 #include "clang/Basic/LangStandard.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 "clang/Driver/ToolChain.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"

 using namespace clang::driver;
 using namespace clang::driver::tools;
 using namespace clang::driver::toolchains;
 using namespace clang;
 using namespace llvm::opt;

 void solaris::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
                                       const InputInfo &Output,
                                       const InputInfoList &Inputs,
                                       const ArgList &Args,
                                       const char *LinkingOutput) const {
   // Just call the Gnu version, which enforces gas on Solaris.
   gnutools::Assembler::ConstructJob(C, JA, Output, Inputs, Args, LinkingOutput);
 }

 bool solaris::isLinkerGnuLd(const ToolChain &TC, const ArgList &Args) {
   // Only used if targetting Solaris.
   const Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ);
   StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
   return UseLinker == "bfd" || UseLinker == "gld";
 }

 static bool getPIE(const ArgList &Args, const ToolChain &TC) {
   if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_static) ||
       Args.hasArg(options::OPT_r))
     return false;

   return Args.hasFlag(options::OPT_pie, options::OPT_no_pie,
                       TC.isPIEDefault(Args));
 }

 // FIXME: Need to handle CLANG_DEFAULT_LINKER here?
 std::string solaris::Linker::getLinkerPath(const ArgList &Args) const {
   const ToolChain &ToolChain = getToolChain();
   if (const Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
     StringRef UseLinker = A->getValue();
     if (!UseLinker.empty()) {
       if (llvm::sys::path::is_absolute(UseLinker) &&
           llvm::sys::fs::can_execute(UseLinker))
         return std::string(UseLinker);

       // Accept 'bfd' and 'gld' as aliases for the GNU linker.
       if (UseLinker == "bfd" || UseLinker == "gld")
         // FIXME: Could also use /usr/bin/gld here.
         return "/usr/gnu/bin/ld";

       // Accept 'ld' as alias for the default linker
       if (UseLinker != "ld")
         ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
             << A->getAsString(Args);
     }
   }

   // getDefaultLinker() always returns an absolute path.
   return ToolChain.getDefaultLinker();
 }

 void solaris::Linker::ConstructJob(Compilation &C, const JobAction &JA,
                                    const InputInfo &Output,
                                    const InputInfoList &Inputs,
                                    const ArgList &Args,
                                    const char *LinkingOutput) const {
   const auto &ToolChain = static_cast<const Solaris &>(getToolChain());
   const Driver &D = ToolChain.getDriver();
   const llvm::Triple::ArchType Arch = ToolChain.getArch();
   const bool IsPIE = getPIE(Args, ToolChain);
   const bool LinkerIsGnuLd = isLinkerGnuLd(ToolChain, Args);
   ArgStringList CmdArgs;

   // Demangle C++ names in errors.  GNU ld already defaults to --demangle.
   if (!LinkerIsGnuLd)
     CmdArgs.push_back("-C");

   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared,
                    options::OPT_r)) {
     CmdArgs.push_back("-e");
     CmdArgs.push_back("_start");
   }

   if (IsPIE) {
     if (LinkerIsGnuLd) {
       CmdArgs.push_back("-pie");
     } else {
       CmdArgs.push_back("-z");
       CmdArgs.push_back("type=pie");
     }
   }

   if (Args.hasArg(options::OPT_static)) {
     CmdArgs.push_back("-Bstatic");
     CmdArgs.push_back("-dn");
   } else {
     if (!Args.hasArg(options::OPT_r) && Args.hasArg(options::OPT_shared))
       CmdArgs.push_back("-shared");

     // libpthread has been folded into libc since Solaris 10, no need to do
     // anything for pthreads. Claim argument to avoid warning.
     Args.ClaimAllArgs(options::OPT_pthread);
     Args.ClaimAllArgs(options::OPT_pthreads);
   }

   if (LinkerIsGnuLd) {
     // Set the correct linker emulation for 32- and 64-bit Solaris.
     switch (Arch) {
     case llvm::Triple::x86:
       CmdArgs.push_back("-m");
       CmdArgs.push_back("elf_i386_sol2");
       break;
     case llvm::Triple::x86_64:
       CmdArgs.push_back("-m");
       CmdArgs.push_back("elf_x86_64_sol2");
       break;
     case llvm::Triple::sparc:
       CmdArgs.push_back("-m");
       CmdArgs.push_back("elf32_sparc_sol2");
       break;
     case llvm::Triple::sparcv9:
       CmdArgs.push_back("-m");
       CmdArgs.push_back("elf64_sparc_sol2");
       break;
     default:
       break;
     }

     if (Args.hasArg(options::OPT_rdynamic))
       CmdArgs.push_back("-export-dynamic");

     CmdArgs.push_back("--eh-frame-hdr");
   } else {
     // -rdynamic is a no-op with Solaris ld.  Claim argument to avoid warning.
     Args.ClaimAllArgs(options::OPT_rdynamic);
   }

   assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
   if (Output.isFilename()) {
     CmdArgs.push_back("-o");
     CmdArgs.push_back(Output.getFilename());
   }

   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
                    options::OPT_r)) {
     if (!Args.hasArg(options::OPT_shared))
       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));

     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));

     const Arg *Std = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi);
     bool HaveAnsi = false;
     const LangStandard *LangStd = nullptr;
     if (Std) {
       HaveAnsi = Std->getOption().matches(options::OPT_ansi);
       if (!HaveAnsi)
         LangStd = LangStandard::getLangStandardForName(Std->getValue());
     }

     const char *values_X = "values-Xa.o";
     // Use values-Xc.o for -ansi, -std=c*, -std=iso9899:199409.
     if (HaveAnsi || (LangStd && !LangStd->isGNUMode()))
       values_X = "values-Xc.o";
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(values_X)));

     const char *values_xpg = "values-xpg6.o";
     // Use values-xpg4.o for -std=c90, -std=gnu90, -std=iso9899:199409.
     if (LangStd && LangStd->getLanguage() == Language::C && !LangStd->isC99())
       values_xpg = "values-xpg4.o";
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(values_xpg)));

     const char *crtbegin = nullptr;
     if (Args.hasArg(options::OPT_shared) || IsPIE)
       crtbegin = "crtbeginS.o";
     else
       crtbegin = "crtbegin.o";
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
     // Add crtfastmath.o if available and fast math is enabled.
     ToolChain.addFastMathRuntimeIfAvailable(Args, CmdArgs);
   }

   ToolChain.AddFilePathLibArgs(Args, CmdArgs);

   Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group});

   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
                    options::OPT_r)) {
     // Use the static OpenMP runtime with -static-openmp
     bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
                         !Args.hasArg(options::OPT_static);
     addOpenMPRuntime(C, CmdArgs, ToolChain, Args, StaticOpenMP);

     if (D.CCCIsCXX()) {
       if (ToolChain.ShouldLinkCXXStdlib(Args))
         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
       CmdArgs.push_back("-lm");
     }
     // Silence warnings when linking C code with a C++ '-stdlib' argument.
     Args.ClaimAllArgs(options::OPT_stdlib_EQ);
     // Additional linker set-up and flags for Fortran. This is required in order
     // to generate executables. As Fortran runtime depends on the C runtime,
     // these dependencies need to be listed before the C runtime below.
     if (D.IsFlangMode()) {
       addFortranRuntimeLibraryPath(getToolChain(), Args, CmdArgs);
       addFortranRuntimeLibs(getToolChain(), Args, CmdArgs);
       CmdArgs.push_back("-lm");
     }
     if (Args.hasArg(options::OPT_fstack_protector) ||
         Args.hasArg(options::OPT_fstack_protector_strong) ||
         Args.hasArg(options::OPT_fstack_protector_all)) {
       // Explicitly link ssp libraries, not folded into Solaris libc.
       CmdArgs.push_back("-lssp_nonshared");
       CmdArgs.push_back("-lssp");
     }
     // LLVM support for atomics on 32-bit SPARC V8+ is incomplete, so
     // forcibly link with libatomic as a workaround.
     if (Arch == llvm::Triple::sparc) {
       addAsNeededOption(ToolChain, Args, CmdArgs, true);
       CmdArgs.push_back("-latomic");
       addAsNeededOption(ToolChain, Args, CmdArgs, false);
     }
     addAsNeededOption(ToolChain, Args, CmdArgs, true);
     CmdArgs.push_back("-lgcc_s");
     addAsNeededOption(ToolChain, Args, CmdArgs, false);
     CmdArgs.push_back("-lc");
     if (!Args.hasArg(options::OPT_shared)) {
       CmdArgs.push_back("-lgcc");
     }
     const SanitizerArgs &SA = ToolChain.getSanitizerArgs(Args);
     if (NeedsSanitizerDeps) {
       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);

       // Work around Solaris/amd64 ld bug when calling __tls_get_addr directly.
       // However, ld -z relax=transtls is available since Solaris 11.2, but not
       // in Illumos.
       if (Arch == llvm::Triple::x86_64 &&
           (SA.needsAsanRt() || SA.needsStatsRt() ||
            (SA.needsUbsanRt() && !SA.requiresMinimalRuntime())) &&
           !LinkerIsGnuLd) {
         CmdArgs.push_back("-z");
         CmdArgs.push_back("relax=transtls");
       }
     }
     // Avoid AsanInitInternal cycle, Issue #64126.
     if (ToolChain.getTriple().isX86() && SA.needsSharedRt() &&
         SA.needsAsanRt()) {
       CmdArgs.push_back("-z");
       CmdArgs.push_back("now");
     }
   }

   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
                    options::OPT_r)) {
     const char *crtend = nullptr;
     if (Args.hasArg(options::OPT_shared) || IsPIE)
       crtend = "crtendS.o";
     else
       crtend = "crtend.o";
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
   }

   ToolChain.addProfileRTLibs(Args, CmdArgs);

   const char *Exec = Args.MakeArgString(getLinkerPath(Args));
   C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
                                          Exec, CmdArgs, Inputs, Output));
 }

 static StringRef getSolarisLibSuffix(const llvm::Triple &Triple) {
   switch (Triple.getArch()) {
   case llvm::Triple::x86:
   case llvm::Triple::sparc:
   default:
     break;
   case llvm::Triple::x86_64:
     return "/amd64";
   case llvm::Triple::sparcv9:
     return "/sparcv9";
   }
   return "";
 }

 /// Solaris - Solaris tool chain which can call as(1) and ld(1) directly.

 Solaris::Solaris(const Driver &D, const llvm::Triple &Triple,
                  const ArgList &Args)
     : Generic_ELF(D, Triple, Args) {

   GCCInstallation.init(Triple, Args);

   StringRef LibSuffix = getSolarisLibSuffix(Triple);
   path_list &Paths = getFilePaths();
   if (GCCInstallation.isValid()) {
     // On Solaris gcc uses both an architecture-specific path with triple in it
     // as well as a more generic lib path (+arch suffix).
     addPathIfExists(D,
                     GCCInstallation.getInstallPath() +
                         GCCInstallation.getMultilib().gccSuffix(),
                     Paths);
     addPathIfExists(D, GCCInstallation.getParentLibPath() + LibSuffix, Paths);
   }

   // If we are currently running Clang inside of the requested system root,
   // add its parent library path to those searched.
   if (StringRef(D.Dir).starts_with(D.SysRoot))
     addPathIfExists(D, D.Dir + "/../lib", Paths);

   addPathIfExists(D, D.SysRoot + "/usr/lib" + LibSuffix, Paths);
 }

 SanitizerMask Solaris::getSupportedSanitizers() const {
   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
   SanitizerMask Res = ToolChain::getSupportedSanitizers();
   // FIXME: Omit X86_64 until 64-bit support is figured out.
   if (IsX86) {
     Res |= SanitizerKind::Address;
     Res |= SanitizerKind::PointerCompare;
     Res |= SanitizerKind::PointerSubtract;
   }
   Res |= SanitizerKind::Vptr;
   return Res;
 }

 const char *Solaris::getDefaultLinker() const {
   // FIXME: Only handle Solaris ld and GNU ld here.
   return llvm::StringSwitch<const char *>(CLANG_DEFAULT_LINKER)
       .Cases("bfd", "gld", "/usr/gnu/bin/ld")
       .Default("/usr/bin/ld");
 }

 Tool *Solaris::buildAssembler() const {
   return new tools::solaris::Assembler(*this);
 }

 Tool *Solaris::buildLinker() const { return new tools::solaris::Linker(*this); }

 void Solaris::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
                                         ArgStringList &CC1Args) const {
   const Driver &D = getDriver();

   if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
     return;

   if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
     addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/usr/local/include");

   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(D.SysRoot);
       addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
     }
     return;
   }

   // Add include directories specific to the selected multilib set and multilib.
   if (GCCInstallation.isValid()) {
     const MultilibSet::IncludeDirsFunc &Callback =
         Multilibs.includeDirsCallback();
     if (Callback) {
       for (const auto &Path : Callback(GCCInstallation.getMultilib()))
         addExternCSystemIncludeIfExists(
             DriverArgs, CC1Args, GCCInstallation.getInstallPath() + Path);
     }
   }

   addExternCSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/usr/include");
 }

 void Solaris::addLibStdCxxIncludePaths(
     const llvm::opt::ArgList &DriverArgs,
     llvm::opt::ArgStringList &CC1Args) const {
   // We need a detected GCC installation on Solaris (similar to Linux)
   // to provide libstdc++'s headers.
   if (!GCCInstallation.isValid())
     return;

   // By default, look for the C++ headers in an include directory adjacent to
   // the lib directory of the GCC installation.
   // On Solaris this usually looks like /usr/gcc/X.Y/include/c++/X.Y.Z
   StringRef LibDir = GCCInstallation.getParentLibPath();
   StringRef TripleStr = GCCInstallation.getTriple().str();
   const Multilib &Multilib = GCCInstallation.getMultilib();
   const GCCVersion &Version = GCCInstallation.getVersion();

   // The primary search for libstdc++ supports multiarch variants.
   addLibStdCXXIncludePaths(LibDir.str() + "/../include/c++/" + Version.Text,
                            TripleStr, Multilib.includeSuffix(), DriverArgs,
                            CC1Args);
 }
	//===--- Solaris.cpp - Solaris 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 "Solaris.h"
	#include "CommonArgs.h"
	#include "Gnu.h"
	#include "clang/Basic/LangStandard.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 "clang/Driver/ToolChain.h"
	#include "llvm/ADT/StringSwitch.h"
	#include "llvm/Option/ArgList.h"
	#include "llvm/Support/FileSystem.h"
	#include "llvm/Support/Path.h"

	using namespace clang::driver;
	using namespace clang::driver::tools;
	using namespace clang::driver::toolchains;
	using namespace clang;
	using namespace llvm::opt;

	void solaris::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
	const InputInfo &Output,
	const InputInfoList &Inputs,
	const ArgList &Args,
	const char *LinkingOutput) const {
	// Just call the Gnu version, which enforces gas on Solaris.
	gnutools::Assembler::ConstructJob(C, JA, Output, Inputs, Args, LinkingOutput);
	}

	bool solaris::isLinkerGnuLd(const ToolChain &TC, const ArgList &Args) {
	// Only used if targetting Solaris.
	const Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ);
	StringRef UseLinker = A ? A->getValue() : CLANG_DEFAULT_LINKER;
	return UseLinker == "bfd" \|\| UseLinker == "gld";
	}

	static bool getPIE(const ArgList &Args, const ToolChain &TC) {
	if (Args.hasArg(options::OPT_shared) \|\| Args.hasArg(options::OPT_static) \|\|
	Args.hasArg(options::OPT_r))
	return false;

	return Args.hasFlag(options::OPT_pie, options::OPT_no_pie,
	TC.isPIEDefault(Args));
	}

	// FIXME: Need to handle CLANG_DEFAULT_LINKER here?
	std::string solaris::Linker::getLinkerPath(const ArgList &Args) const {
	const ToolChain &ToolChain = getToolChain();
	if (const Arg *A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
	StringRef UseLinker = A->getValue();
	if (!UseLinker.empty()) {
	if (llvm::sys::path::is_absolute(UseLinker) &&
	llvm::sys::fs::can_execute(UseLinker))
	return std::string(UseLinker);

	// Accept 'bfd' and 'gld' as aliases for the GNU linker.
	if (UseLinker == "bfd" \|\| UseLinker == "gld")
	// FIXME: Could also use /usr/bin/gld here.
	return "/usr/gnu/bin/ld";

	// Accept 'ld' as alias for the default linker
	if (UseLinker != "ld")
	ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
	<< A->getAsString(Args);
	}
	}

	// getDefaultLinker() always returns an absolute path.
	return ToolChain.getDefaultLinker();
	}

	void solaris::Linker::ConstructJob(Compilation &C, const JobAction &JA,
	const InputInfo &Output,
	const InputInfoList &Inputs,
	const ArgList &Args,
	const char *LinkingOutput) const {
	const auto &ToolChain = static_cast<const Solaris &>(getToolChain());
	const Driver &D = ToolChain.getDriver();
	const llvm::Triple::ArchType Arch = ToolChain.getArch();
	const bool IsPIE = getPIE(Args, ToolChain);
	const bool LinkerIsGnuLd = isLinkerGnuLd(ToolChain, Args);
	ArgStringList CmdArgs;

	// Demangle C++ names in errors. GNU ld already defaults to --demangle.
	if (!LinkerIsGnuLd)
	CmdArgs.push_back("-C");

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared,
	options::OPT_r)) {
	CmdArgs.push_back("-e");
	CmdArgs.push_back("_start");
	}

	if (IsPIE) {
	if (LinkerIsGnuLd) {
	CmdArgs.push_back("-pie");
	} else {
	CmdArgs.push_back("-z");
	CmdArgs.push_back("type=pie");
	}
	}

	if (Args.hasArg(options::OPT_static)) {
	CmdArgs.push_back("-Bstatic");
	CmdArgs.push_back("-dn");
	} else {
	if (!Args.hasArg(options::OPT_r) && Args.hasArg(options::OPT_shared))
	CmdArgs.push_back("-shared");

	// libpthread has been folded into libc since Solaris 10, no need to do
	// anything for pthreads. Claim argument to avoid warning.
	Args.ClaimAllArgs(options::OPT_pthread);
	Args.ClaimAllArgs(options::OPT_pthreads);
	}

	if (LinkerIsGnuLd) {
	// Set the correct linker emulation for 32- and 64-bit Solaris.
	switch (Arch) {
	case llvm::Triple::x86:
	CmdArgs.push_back("-m");
	CmdArgs.push_back("elf_i386_sol2");
	break;
	case llvm::Triple::x86_64:
	CmdArgs.push_back("-m");
	CmdArgs.push_back("elf_x86_64_sol2");
	break;
	case llvm::Triple::sparc:
	CmdArgs.push_back("-m");
	CmdArgs.push_back("elf32_sparc_sol2");
	break;
	case llvm::Triple::sparcv9:
	CmdArgs.push_back("-m");
	CmdArgs.push_back("elf64_sparc_sol2");
	break;
	default:
	break;
	}

	if (Args.hasArg(options::OPT_rdynamic))
	CmdArgs.push_back("-export-dynamic");

	CmdArgs.push_back("--eh-frame-hdr");
	} else {
	// -rdynamic is a no-op with Solaris ld. Claim argument to avoid warning.
	Args.ClaimAllArgs(options::OPT_rdynamic);
	}

	assert((Output.isFilename() \|\| Output.isNothing()) && "Invalid output.");
	if (Output.isFilename()) {
	CmdArgs.push_back("-o");
	CmdArgs.push_back(Output.getFilename());
	}

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
	options::OPT_r)) {
	if (!Args.hasArg(options::OPT_shared))
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));

	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));

	const Arg *Std = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi);
	bool HaveAnsi = false;
	const LangStandard *LangStd = nullptr;
	if (Std) {
	HaveAnsi = Std->getOption().matches(options::OPT_ansi);
	if (!HaveAnsi)
	LangStd = LangStandard::getLangStandardForName(Std->getValue());
	}

	const char *values_X = "values-Xa.o";
	// Use values-Xc.o for -ansi, -std=c*, -std=iso9899:199409.
	if (HaveAnsi \|\| (LangStd && !LangStd->isGNUMode()))
	values_X = "values-Xc.o";
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(values_X)));

	const char *values_xpg = "values-xpg6.o";
	// Use values-xpg4.o for -std=c90, -std=gnu90, -std=iso9899:199409.
	if (LangStd && LangStd->getLanguage() == Language::C && !LangStd->isC99())
	values_xpg = "values-xpg4.o";
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(values_xpg)));

	const char *crtbegin = nullptr;
	if (Args.hasArg(options::OPT_shared) \|\| IsPIE)
	crtbegin = "crtbeginS.o";
	else
	crtbegin = "crtbegin.o";
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
	// Add crtfastmath.o if available and fast math is enabled.
	ToolChain.addFastMathRuntimeIfAvailable(Args, CmdArgs);
	}

	ToolChain.AddFilePathLibArgs(Args, CmdArgs);

	Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group});

	bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
	AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
	options::OPT_r)) {
	// Use the static OpenMP runtime with -static-openmp
	bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
	!Args.hasArg(options::OPT_static);
	addOpenMPRuntime(C, CmdArgs, ToolChain, Args, StaticOpenMP);

	if (D.CCCIsCXX()) {
	if (ToolChain.ShouldLinkCXXStdlib(Args))
	ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
	CmdArgs.push_back("-lm");
	}
	// Silence warnings when linking C code with a C++ '-stdlib' argument.
	Args.ClaimAllArgs(options::OPT_stdlib_EQ);
	// Additional linker set-up and flags for Fortran. This is required in order
	// to generate executables. As Fortran runtime depends on the C runtime,
	// these dependencies need to be listed before the C runtime below.
	if (D.IsFlangMode()) {
	addFortranRuntimeLibraryPath(getToolChain(), Args, CmdArgs);
	addFortranRuntimeLibs(getToolChain(), Args, CmdArgs);
	CmdArgs.push_back("-lm");
	}
	if (Args.hasArg(options::OPT_fstack_protector) \|\|
	Args.hasArg(options::OPT_fstack_protector_strong) \|\|
	Args.hasArg(options::OPT_fstack_protector_all)) {
	// Explicitly link ssp libraries, not folded into Solaris libc.
	CmdArgs.push_back("-lssp_nonshared");
	CmdArgs.push_back("-lssp");
	}
	// LLVM support for atomics on 32-bit SPARC V8+ is incomplete, so
	// forcibly link with libatomic as a workaround.
	if (Arch == llvm::Triple::sparc) {
	addAsNeededOption(ToolChain, Args, CmdArgs, true);
	CmdArgs.push_back("-latomic");
	addAsNeededOption(ToolChain, Args, CmdArgs, false);
	}
	addAsNeededOption(ToolChain, Args, CmdArgs, true);
	CmdArgs.push_back("-lgcc_s");
	addAsNeededOption(ToolChain, Args, CmdArgs, false);
	CmdArgs.push_back("-lc");
	if (!Args.hasArg(options::OPT_shared)) {
	CmdArgs.push_back("-lgcc");
	}
	const SanitizerArgs &SA = ToolChain.getSanitizerArgs(Args);
	if (NeedsSanitizerDeps) {
	linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);

	// Work around Solaris/amd64 ld bug when calling __tls_get_addr directly.
	// However, ld -z relax=transtls is available since Solaris 11.2, but not
	// in Illumos.
	if (Arch == llvm::Triple::x86_64 &&
	(SA.needsAsanRt() \|\| SA.needsStatsRt() \|\|
	(SA.needsUbsanRt() && !SA.requiresMinimalRuntime())) &&
	!LinkerIsGnuLd) {
	CmdArgs.push_back("-z");
	CmdArgs.push_back("relax=transtls");
	}
	}
	// Avoid AsanInitInternal cycle, Issue #64126.
	if (ToolChain.getTriple().isX86() && SA.needsSharedRt() &&
	SA.needsAsanRt()) {
	CmdArgs.push_back("-z");
	CmdArgs.push_back("now");
	}
	}

	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
	options::OPT_r)) {
	const char *crtend = nullptr;
	if (Args.hasArg(options::OPT_shared) \|\| IsPIE)
	crtend = "crtendS.o";
	else
	crtend = "crtend.o";
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
	CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
	}

	ToolChain.addProfileRTLibs(Args, CmdArgs);

	const char *Exec = Args.MakeArgString(getLinkerPath(Args));
	C.addCommand(std::make_unique<Command>(JA, *this, ResponseFileSupport::None(),
	Exec, CmdArgs, Inputs, Output));
	}

	static StringRef getSolarisLibSuffix(const llvm::Triple &Triple) {
	switch (Triple.getArch()) {
	case llvm::Triple::x86:
	case llvm::Triple::sparc:
	default:
	break;
	case llvm::Triple::x86_64:
	return "/amd64";
	case llvm::Triple::sparcv9:
	return "/sparcv9";
	}
	return "";
	}

	/// Solaris - Solaris tool chain which can call as(1) and ld(1) directly.

	Solaris::Solaris(const Driver &D, const llvm::Triple &Triple,
	const ArgList &Args)
	: Generic_ELF(D, Triple, Args) {

	GCCInstallation.init(Triple, Args);

	StringRef LibSuffix = getSolarisLibSuffix(Triple);
	path_list &Paths = getFilePaths();
	if (GCCInstallation.isValid()) {
	// On Solaris gcc uses both an architecture-specific path with triple in it
	// as well as a more generic lib path (+arch suffix).
	addPathIfExists(D,
	GCCInstallation.getInstallPath() +
	GCCInstallation.getMultilib().gccSuffix(),
	Paths);
	addPathIfExists(D, GCCInstallation.getParentLibPath() + LibSuffix, Paths);
	}

	// If we are currently running Clang inside of the requested system root,
	// add its parent library path to those searched.
	if (StringRef(D.Dir).starts_with(D.SysRoot))
	addPathIfExists(D, D.Dir + "/../lib", Paths);

	addPathIfExists(D, D.SysRoot + "/usr/lib" + LibSuffix, Paths);
	}

	SanitizerMask Solaris::getSupportedSanitizers() const {
	const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
	SanitizerMask Res = ToolChain::getSupportedSanitizers();
	// FIXME: Omit X86_64 until 64-bit support is figured out.
	if (IsX86) {
	Res \|= SanitizerKind::Address;
	Res \|= SanitizerKind::PointerCompare;
	Res \|= SanitizerKind::PointerSubtract;
	}
	Res \|= SanitizerKind::Vptr;
	return Res;
	}

	const char *Solaris::getDefaultLinker() const {
	// FIXME: Only handle Solaris ld and GNU ld here.
	return llvm::StringSwitch<const char *>(CLANG_DEFAULT_LINKER)
	.Cases("bfd", "gld", "/usr/gnu/bin/ld")
	.Default("/usr/bin/ld");
	}

	Tool *Solaris::buildAssembler() const {
	return new tools::solaris::Assembler(*this);
	}

	Tool Solaris::buildLinker() const { return new tools::solaris::Linker(this); }

	void Solaris::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
	ArgStringList &CC1Args) const {
	const Driver &D = getDriver();

	if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
	return;

	if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
	addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/usr/local/include");

	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(D.SysRoot);
	addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir);
	}
	return;
	}

	// Add include directories specific to the selected multilib set and multilib.
	if (GCCInstallation.isValid()) {
	const MultilibSet::IncludeDirsFunc &Callback =
	Multilibs.includeDirsCallback();
	if (Callback) {
	for (const auto &Path : Callback(GCCInstallation.getMultilib()))
	addExternCSystemIncludeIfExists(
	DriverArgs, CC1Args, GCCInstallation.getInstallPath() + Path);
	}
	}

	addExternCSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/usr/include");
	}

	void Solaris::addLibStdCxxIncludePaths(
	const llvm::opt::ArgList &DriverArgs,
	llvm::opt::ArgStringList &CC1Args) const {
	// We need a detected GCC installation on Solaris (similar to Linux)
	// to provide libstdc++'s headers.
	if (!GCCInstallation.isValid())
	return;

	// By default, look for the C++ headers in an include directory adjacent to
	// the lib directory of the GCC installation.
	// On Solaris this usually looks like /usr/gcc/X.Y/include/c++/X.Y.Z
	StringRef LibDir = GCCInstallation.getParentLibPath();
	StringRef TripleStr = GCCInstallation.getTriple().str();
	const Multilib &Multilib = GCCInstallation.getMultilib();
	const GCCVersion &Version = GCCInstallation.getVersion();

	// The primary search for libstdc++ supports multiarch variants.
	addLibStdCXXIncludePaths(LibDir.str() + "/../include/c++/" + Version.Text,
	TripleStr, Multilib.includeSuffix(), DriverArgs,
	CC1Args);
	}