forked from OSchip/llvm-project
221 lines
8.0 KiB
C++
221 lines
8.0 KiB
C++
//===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "WebAssembly.h"
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#include "CommonArgs.h"
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#include "clang/Driver/Compilation.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Option/ArgList.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang::driver::toolchains;
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using namespace clang;
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using namespace llvm::opt;
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wasm::Linker::Linker(const ToolChain &TC)
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: GnuTool("wasm::Linker", "lld", TC) {}
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/// Following the conventions in https://wiki.debian.org/Multiarch/Tuples,
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/// we remove the vendor field to form the multiarch triple.
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static std::string getMultiarchTriple(const Driver &D,
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const llvm::Triple &TargetTriple,
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StringRef SysRoot) {
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return (TargetTriple.getArchName() + "-" +
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TargetTriple.getOSAndEnvironmentName()).str();
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}
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bool wasm::Linker::isLinkJob() const { return true; }
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bool wasm::Linker::hasIntegratedCPP() const { return false; }
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std::string wasm::Linker::getLinkerPath(const ArgList &Args) const {
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const ToolChain &ToolChain = getToolChain();
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if (const Arg* A = Args.getLastArg(options::OPT_fuse_ld_EQ)) {
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StringRef UseLinker = A->getValue();
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if (!UseLinker.empty()) {
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if (llvm::sys::path::is_absolute(UseLinker) &&
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llvm::sys::fs::can_execute(UseLinker))
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return UseLinker;
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// Accept 'lld', and 'ld' as aliases for the default linker
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if (UseLinker != "lld" && UseLinker != "ld")
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ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
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<< A->getAsString(Args);
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}
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}
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return ToolChain.GetProgramPath(ToolChain.getDefaultLinker());
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}
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void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
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const InputInfo &Output,
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const InputInfoList &Inputs,
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const ArgList &Args,
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const char *LinkingOutput) const {
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const ToolChain &ToolChain = getToolChain();
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const char *Linker = Args.MakeArgString(getLinkerPath(Args));
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ArgStringList CmdArgs;
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if (Args.hasArg(options::OPT_s))
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CmdArgs.push_back("--strip-all");
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Args.AddAllArgs(CmdArgs, options::OPT_L);
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Args.AddAllArgs(CmdArgs, options::OPT_u);
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ToolChain.AddFilePathLibArgs(Args, CmdArgs);
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
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CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crt1.o")));
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AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
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if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
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if (ToolChain.ShouldLinkCXXStdlib(Args))
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ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
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if (Args.hasArg(options::OPT_pthread)) {
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CmdArgs.push_back("-lpthread");
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CmdArgs.push_back("--shared-memory");
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}
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CmdArgs.push_back("-lc");
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AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
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}
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CmdArgs.push_back("-o");
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CmdArgs.push_back(Output.getFilename());
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C.addCommand(llvm::make_unique<Command>(JA, *this, Linker, CmdArgs, Inputs));
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}
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WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
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const llvm::opt::ArgList &Args)
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: ToolChain(D, Triple, Args) {
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assert(Triple.isArch32Bit() != Triple.isArch64Bit());
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getProgramPaths().push_back(getDriver().getInstalledDir());
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if (getTriple().getOS() == llvm::Triple::UnknownOS) {
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// Theoretically an "unknown" OS should mean no standard libraries, however
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// it could also mean that a custom set of libraries is in use, so just add
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// /lib to the search path. Disable multiarch in this case, to discourage
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// paths containing "unknown" from acquiring meanings.
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getFilePaths().push_back(getDriver().SysRoot + "/lib");
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} else {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), Triple, getDriver().SysRoot);
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getFilePaths().push_back(getDriver().SysRoot + "/lib/" + MultiarchTriple);
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}
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}
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bool WebAssembly::IsMathErrnoDefault() const { return false; }
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bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
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bool WebAssembly::UseObjCMixedDispatch() const { return true; }
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bool WebAssembly::isPICDefault() const { return false; }
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bool WebAssembly::isPIEDefault() const { return false; }
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bool WebAssembly::isPICDefaultForced() const { return false; }
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bool WebAssembly::IsIntegratedAssemblerDefault() const { return true; }
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bool WebAssembly::hasBlocksRuntime() const { return false; }
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// TODO: Support profiling.
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bool WebAssembly::SupportsProfiling() const { return false; }
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bool WebAssembly::HasNativeLLVMSupport() const { return true; }
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void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
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ArgStringList &CC1Args,
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Action::OffloadKind) const {
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if (DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
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options::OPT_fno_use_init_array, true))
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CC1Args.push_back("-fuse-init-array");
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// '-pthread' implies '-target-feature +atomics'
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if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
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false)) {
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if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
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false))
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getDriver().Diag(diag::err_drv_argument_not_allowed_with)
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<< "-pthread"
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<< "-mno-atomics";
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CC1Args.push_back("-target-feature");
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CC1Args.push_back("+atomics");
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}
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}
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ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
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return ToolChain::RLT_CompilerRT;
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}
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ToolChain::CXXStdlibType
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WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
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if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
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StringRef Value = A->getValue();
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if (Value != "libc++")
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getDriver().Diag(diag::err_drv_invalid_stdlib_name)
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<< A->getAsString(Args);
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}
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return ToolChain::CST_Libcxx;
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}
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void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
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ArgStringList &CC1Args) const {
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if (!DriverArgs.hasArg(options::OPT_nostdinc)) {
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if (getTriple().getOS() != llvm::Triple::UnknownOS) {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
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addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include/" + MultiarchTriple);
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}
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addSystemInclude(DriverArgs, CC1Args, getDriver().SysRoot + "/include");
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}
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}
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void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
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ArgStringList &CC1Args) const {
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if (!DriverArgs.hasArg(options::OPT_nostdlibinc) &&
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!DriverArgs.hasArg(options::OPT_nostdincxx)) {
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if (getTriple().getOS() != llvm::Triple::UnknownOS) {
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const std::string MultiarchTriple =
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getMultiarchTriple(getDriver(), getTriple(), getDriver().SysRoot);
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addSystemInclude(DriverArgs, CC1Args,
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getDriver().SysRoot + "/include/" + MultiarchTriple + "/c++/v1");
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}
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addSystemInclude(DriverArgs, CC1Args,
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getDriver().SysRoot + "/include/c++/v1");
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}
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}
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void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
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llvm::opt::ArgStringList &CmdArgs) const {
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switch (GetCXXStdlibType(Args)) {
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case ToolChain::CST_Libcxx:
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CmdArgs.push_back("-lc++");
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CmdArgs.push_back("-lc++abi");
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break;
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case ToolChain::CST_Libstdcxx:
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llvm_unreachable("invalid stdlib name");
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}
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}
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Tool *WebAssembly::buildLinker() const {
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return new tools::wasm::Linker(*this);
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}
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