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dca3a6e562e012940c2b62a4d8dae3afec09caa4
clang-p2996/clang/lib/Driver/ToolChains/WebAssembly.cpp
Heejin Ahn dca3a6e562 [WebAssembly] Make EH depend on multivalue and reference-types (#91299) 
This PR turns on multivalue and reference-types features when
exception-handling feature is turned on, and errors out when disabling
of those dependent features is explicitly requested.

I think doing this would be safe anyway regardless of whether or when we
end up turning on reference-types by default.

We currently don't yet have a experimental flag for the Clang and LLVM
for the new experimental EH yet. But I think it should be fine to turn
those features on even if the LLVM does not yet generate the new EH
instructions, for the same reason we tried to turn them on by default
and the browsers that support EH also support multivalue and
reference-types anyway.
2024-05-07 13:02:31 -07:00

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//===--- WebAssembly.cpp - WebAssembly ToolChain Implementation -*- 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 "WebAssembly.h"
#include "CommonArgs.h"
#include "Gnu.h"
#include "clang/Basic/Version.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 "llvm/Option/ArgList.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
/// Following the conventions in https://wiki.debian.org/Multiarch/Tuples,
/// we remove the vendor field to form the multiarch triple.
std::string WebAssembly::getMultiarchTriple(const Driver &D,
const llvm::Triple &TargetTriple,
StringRef SysRoot) const {
return (TargetTriple.getArchName() + "-" +
TargetTriple.getOSAndEnvironmentName()).str();
}
std::string wasm::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);
// Interpret 'lld' as explicitly requesting `wasm-ld`, so look for that
// linker. Note that for `wasm32-wasip2` this overrides the default linker
// of `wasm-component-ld`.
if (UseLinker == "lld") {
return ToolChain.GetProgramPath("wasm-ld");
}
// Allow 'ld' as an alias for the default linker
if (UseLinker != "ld")
ToolChain.getDriver().Diag(diag::err_drv_invalid_linker_name)
<< A->getAsString(Args);
}
}
return ToolChain.GetProgramPath(ToolChain.getDefaultLinker());
}
void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
const ArgList &Args,
const char *LinkingOutput) const {
const ToolChain &ToolChain = getToolChain();
const char *Linker = Args.MakeArgString(getLinkerPath(Args));
ArgStringList CmdArgs;
CmdArgs.push_back("-m");
if (ToolChain.getTriple().isArch64Bit())
CmdArgs.push_back("wasm64");
else
CmdArgs.push_back("wasm32");
if (Args.hasArg(options::OPT_s))
CmdArgs.push_back("--strip-all");
// On `wasip2` the default linker is `wasm-component-ld` which wraps the
// execution of `wasm-ld`. Find `wasm-ld` and pass it as an argument of where
// to find it to avoid it needing to hunt and rediscover or search `PATH` for
// where it is.
if (llvm::sys::path::stem(Linker).ends_with_insensitive(
"wasm-component-ld")) {
CmdArgs.push_back("--wasm-ld-path");
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetProgramPath("wasm-ld")));
}
Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_u});
ToolChain.AddFilePathLibArgs(Args, CmdArgs);
bool IsCommand = true;
const char *Crt1;
const char *Entry = nullptr;
// When -shared is specified, use the reactor exec model unless
// specified otherwise.
if (Args.hasArg(options::OPT_shared))
IsCommand = false;
if (const Arg *A = Args.getLastArg(options::OPT_mexec_model_EQ)) {
StringRef CM = A->getValue();
if (CM == "command") {
IsCommand = true;
} else if (CM == "reactor") {
IsCommand = false;
} else {
ToolChain.getDriver().Diag(diag::err_drv_invalid_argument_to_option)
<< CM << A->getOption().getName();
}
}
if (IsCommand) {
// If crt1-command.o exists, it supports new-style commands, so use it.
// Otherwise, use the old crt1.o. This is a temporary transition measure.
// Once WASI libc no longer needs to support LLVM versions which lack
// support for new-style command, it can make crt1.o the same as
// crt1-command.o. And once LLVM no longer needs to support WASI libc
// versions before that, it can switch to using crt1-command.o.
Crt1 = "crt1.o";
if (ToolChain.GetFilePath("crt1-command.o") != "crt1-command.o")
Crt1 = "crt1-command.o";
} else {
Crt1 = "crt1-reactor.o";
Entry = "_initialize";
}
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles))
CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(Crt1)));
if (Entry) {
CmdArgs.push_back(Args.MakeArgString("--entry"));
CmdArgs.push_back(Args.MakeArgString(Entry));
}
if (Args.hasArg(options::OPT_shared))
CmdArgs.push_back(Args.MakeArgString("-shared"));
AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
if (ToolChain.ShouldLinkCXXStdlib(Args))
ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
if (Args.hasArg(options::OPT_pthread)) {
CmdArgs.push_back("-lpthread");
CmdArgs.push_back("--shared-memory");
}
CmdArgs.push_back("-lc");
AddRunTimeLibs(ToolChain, ToolChain.getDriver(), CmdArgs, Args);
}
CmdArgs.push_back("-o");
CmdArgs.push_back(Output.getFilename());
// When optimizing, if wasm-opt is available, run it.
std::string WasmOptPath;
if (Args.getLastArg(options::OPT_O_Group)) {
WasmOptPath = ToolChain.GetProgramPath("wasm-opt");
if (WasmOptPath == "wasm-opt") {
WasmOptPath = {};
}
}
if (!WasmOptPath.empty()) {
CmdArgs.push_back("--keep-section=target_features");
}
C.addCommand(std::make_unique<Command>(JA, *this,
ResponseFileSupport::AtFileCurCP(),
Linker, CmdArgs, Inputs, Output));
if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
if (!WasmOptPath.empty()) {
StringRef OOpt = "s";
if (A->getOption().matches(options::OPT_O4) ||
A->getOption().matches(options::OPT_Ofast))
OOpt = "4";
else if (A->getOption().matches(options::OPT_O0))
OOpt = "0";
else if (A->getOption().matches(options::OPT_O))
OOpt = A->getValue();
if (OOpt != "0") {
const char *WasmOpt = Args.MakeArgString(WasmOptPath);
ArgStringList OptArgs;
OptArgs.push_back(Output.getFilename());
OptArgs.push_back(Args.MakeArgString(llvm::Twine("-O") + OOpt));
OptArgs.push_back("-o");
OptArgs.push_back(Output.getFilename());
C.addCommand(std::make_unique<Command>(
JA, *this, ResponseFileSupport::AtFileCurCP(), WasmOpt, OptArgs,
Inputs, Output));
}
}
}
}
/// Given a base library directory, append path components to form the
/// LTO directory.
static std::string AppendLTOLibDir(const std::string &Dir) {
// The version allows the path to be keyed to the specific version of
// LLVM in used, as the bitcode format is not stable.
return Dir + "/llvm-lto/" LLVM_VERSION_STRING;
}
WebAssembly::WebAssembly(const Driver &D, const llvm::Triple &Triple,
const llvm::opt::ArgList &Args)
: ToolChain(D, Triple, Args) {
assert(Triple.isArch32Bit() != Triple.isArch64Bit());
getProgramPaths().push_back(getDriver().Dir);
auto SysRoot = getDriver().SysRoot;
if (getTriple().getOS() == llvm::Triple::UnknownOS) {
// Theoretically an "unknown" OS should mean no standard libraries, however
// it could also mean that a custom set of libraries is in use, so just add
// /lib to the search path. Disable multiarch in this case, to discourage
// paths containing "unknown" from acquiring meanings.
getFilePaths().push_back(SysRoot + "/lib");
} else {
const std::string MultiarchTriple =
getMultiarchTriple(getDriver(), Triple, SysRoot);
if (D.isUsingLTO()) {
// For LTO, enable use of lto-enabled sysroot libraries too, if available.
// Note that the directory is keyed to the LLVM revision, as LLVM's
// bitcode format is not stable.
auto Dir = AppendLTOLibDir(SysRoot + "/lib/" + MultiarchTriple);
getFilePaths().push_back(Dir);
}
getFilePaths().push_back(SysRoot + "/lib/" + MultiarchTriple);
}
}
const char *WebAssembly::getDefaultLinker() const {
if (getOS() == "wasip2")
return "wasm-component-ld";
return "wasm-ld";
}
bool WebAssembly::IsMathErrnoDefault() const { return false; }
bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }
bool WebAssembly::UseObjCMixedDispatch() const { return true; }
bool WebAssembly::isPICDefault() const { return false; }
bool WebAssembly::isPIEDefault(const llvm::opt::ArgList &Args) const {
return false;
}
bool WebAssembly::isPICDefaultForced() const { return false; }
bool WebAssembly::hasBlocksRuntime() const { return false; }
// TODO: Support profiling.
bool WebAssembly::SupportsProfiling() const { return false; }
bool WebAssembly::HasNativeLLVMSupport() const { return true; }
void WebAssembly::addClangTargetOptions(const ArgList &DriverArgs,
ArgStringList &CC1Args,
Action::OffloadKind) const {
if (!DriverArgs.hasFlag(clang::driver::options::OPT_fuse_init_array,
options::OPT_fno_use_init_array, true))
CC1Args.push_back("-fno-use-init-array");
// '-pthread' implies atomics, bulk-memory, mutable-globals, and sign-ext
if (DriverArgs.hasFlag(options::OPT_pthread, options::OPT_no_pthread,
false)) {
if (DriverArgs.hasFlag(options::OPT_mno_atomics, options::OPT_matomics,
false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-pthread"
<< "-mno-atomics";
if (DriverArgs.hasFlag(options::OPT_mno_bulk_memory,
options::OPT_mbulk_memory, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-pthread"
<< "-mno-bulk-memory";
if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
options::OPT_mmutable_globals, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-pthread"
<< "-mno-mutable-globals";
if (DriverArgs.hasFlag(options::OPT_mno_sign_ext, options::OPT_msign_ext,
false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-pthread"
<< "-mno-sign-ext";
CC1Args.push_back("-target-feature");
CC1Args.push_back("+atomics");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+bulk-memory");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+mutable-globals");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+sign-ext");
}
if (!DriverArgs.hasFlag(options::OPT_mmutable_globals,
options::OPT_mno_mutable_globals, false)) {
// -fPIC implies +mutable-globals because the PIC ABI used by the linker
// depends on importing and exporting mutable globals.
llvm::Reloc::Model RelocationModel;
unsigned PICLevel;
bool IsPIE;
std::tie(RelocationModel, PICLevel, IsPIE) =
ParsePICArgs(*this, DriverArgs);
if (RelocationModel == llvm::Reloc::PIC_) {
if (DriverArgs.hasFlag(options::OPT_mno_mutable_globals,
options::OPT_mmutable_globals, false)) {
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-fPIC"
<< "-mno-mutable-globals";
}
CC1Args.push_back("-target-feature");
CC1Args.push_back("+mutable-globals");
}
}
if (DriverArgs.getLastArg(options::OPT_fwasm_exceptions)) {
// '-fwasm-exceptions' is not compatible with '-mno-exception-handling'
if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
options::OPT_mexception_handing, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-fwasm-exceptions"
<< "-mno-exception-handling";
// '-fwasm-exceptions' is not compatible with
// '-mllvm -enable-emscripten-cxx-exceptions'
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions")
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-fwasm-exceptions"
<< "-mllvm -enable-emscripten-cxx-exceptions";
}
// '-fwasm-exceptions' implies exception-handling feature
CC1Args.push_back("-target-feature");
CC1Args.push_back("+exception-handling");
// Backend needs -wasm-enable-eh to enable Wasm EH
CC1Args.push_back("-mllvm");
CC1Args.push_back("-wasm-enable-eh");
// New Wasm EH spec (adopted in Oct 2023) requires multivalue and
// reference-types.
if (DriverArgs.hasFlag(options::OPT_mno_multivalue,
options::OPT_mmultivalue, false)) {
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-fwasm-exceptions" << "-mno-multivalue";
}
if (DriverArgs.hasFlag(options::OPT_mno_reference_types,
options::OPT_mreference_types, false)) {
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-fwasm-exceptions" << "-mno-reference-types";
}
CC1Args.push_back("-target-feature");
CC1Args.push_back("+multivalue");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+reference-types");
}
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
StringRef Opt = A->getValue(0);
if (Opt.starts_with("-emscripten-cxx-exceptions-allowed")) {
// '-mllvm -emscripten-cxx-exceptions-allowed' should be used with
// '-mllvm -enable-emscripten-cxx-exceptions'
bool EmEHArgExists = false;
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions") {
EmEHArgExists = true;
break;
}
}
if (!EmEHArgExists)
getDriver().Diag(diag::err_drv_argument_only_allowed_with)
<< "-mllvm -emscripten-cxx-exceptions-allowed"
<< "-mllvm -enable-emscripten-cxx-exceptions";
// Prevent functions specified in -emscripten-cxx-exceptions-allowed list
// from being inlined before reaching the wasm backend.
StringRef FuncNamesStr = Opt.split('=').second;
SmallVector<StringRef, 4> FuncNames;
FuncNamesStr.split(FuncNames, ',');
for (auto Name : FuncNames) {
CC1Args.push_back("-mllvm");
CC1Args.push_back(DriverArgs.MakeArgString("--force-attribute=" + Name +
":noinline"));
}
}
if (Opt.starts_with("-wasm-enable-sjlj")) {
// '-mllvm -wasm-enable-sjlj' is not compatible with
// '-mno-exception-handling'
if (DriverArgs.hasFlag(options::OPT_mno_exception_handing,
options::OPT_mexception_handing, false))
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-mllvm -wasm-enable-sjlj"
<< "-mno-exception-handling";
// '-mllvm -wasm-enable-sjlj' is not compatible with
// '-mllvm -enable-emscripten-cxx-exceptions'
// because we don't allow Emscripten EH + Wasm SjLj
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
if (StringRef(A->getValue(0)) == "-enable-emscripten-cxx-exceptions")
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-mllvm -wasm-enable-sjlj"
<< "-mllvm -enable-emscripten-cxx-exceptions";
}
// '-mllvm -wasm-enable-sjlj' is not compatible with
// '-mllvm -enable-emscripten-sjlj'
for (const Arg *A : DriverArgs.filtered(options::OPT_mllvm)) {
if (StringRef(A->getValue(0)) == "-enable-emscripten-sjlj")
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-mllvm -wasm-enable-sjlj"
<< "-mllvm -enable-emscripten-sjlj";
}
// '-mllvm -wasm-enable-sjlj' implies exception-handling feature
CC1Args.push_back("-target-feature");
CC1Args.push_back("+exception-handling");
// Backend needs '-exception-model=wasm' to use Wasm EH instructions
CC1Args.push_back("-exception-model=wasm");
// New Wasm EH spec (adopted in Oct 2023) requires multivalue and
// reference-types.
if (DriverArgs.hasFlag(options::OPT_mno_multivalue,
options::OPT_mmultivalue, false)) {
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-mllvm -wasm-enable-sjlj" << "-mno-multivalue";
}
if (DriverArgs.hasFlag(options::OPT_mno_reference_types,
options::OPT_mreference_types, false)) {
getDriver().Diag(diag::err_drv_argument_not_allowed_with)
<< "-mllvm -wasm-enable-sjlj" << "-mno-reference-types";
}
CC1Args.push_back("-target-feature");
CC1Args.push_back("+multivalue");
CC1Args.push_back("-target-feature");
CC1Args.push_back("+reference-types");
}
}
}
ToolChain::RuntimeLibType WebAssembly::GetDefaultRuntimeLibType() const {
return ToolChain::RLT_CompilerRT;
}
ToolChain::CXXStdlibType
WebAssembly::GetCXXStdlibType(const ArgList &Args) const {
if (Arg *A = Args.getLastArg(options::OPT_stdlib_EQ)) {
StringRef Value = A->getValue();
if (Value == "libc++")
return ToolChain::CST_Libcxx;
else if (Value == "libstdc++")
return ToolChain::CST_Libstdcxx;
else
getDriver().Diag(diag::err_drv_invalid_stdlib_name)
<< A->getAsString(Args);
}
return ToolChain::CST_Libcxx;
}
void WebAssembly::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(clang::driver::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;
// 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;
}
if (getTriple().getOS() != llvm::Triple::UnknownOS) {
const std::string MultiarchTriple =
getMultiarchTriple(D, getTriple(), D.SysRoot);
addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include/" + MultiarchTriple);
}
addSystemInclude(DriverArgs, CC1Args, D.SysRoot + "/include");
}
void WebAssembly::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
if (DriverArgs.hasArg(options::OPT_nostdlibinc, options::OPT_nostdinc,
options::OPT_nostdincxx))
return;
switch (GetCXXStdlibType(DriverArgs)) {
case ToolChain::CST_Libcxx:
addLibCxxIncludePaths(DriverArgs, CC1Args);
break;
case ToolChain::CST_Libstdcxx:
addLibStdCXXIncludePaths(DriverArgs, CC1Args);
break;
}
}
void WebAssembly::AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const {
switch (GetCXXStdlibType(Args)) {
case ToolChain::CST_Libcxx:
CmdArgs.push_back("-lc++");
if (Args.hasArg(options::OPT_fexperimental_library))
CmdArgs.push_back("-lc++experimental");
CmdArgs.push_back("-lc++abi");
break;
case ToolChain::CST_Libstdcxx:
CmdArgs.push_back("-lstdc++");
break;
}
}
SanitizerMask WebAssembly::getSupportedSanitizers() const {
SanitizerMask Res = ToolChain::getSupportedSanitizers();
if (getTriple().isOSEmscripten()) {
Res |= SanitizerKind::Vptr | SanitizerKind::Leak | SanitizerKind::Address;
}
// -fsanitize=function places two words before the function label, which are
// -unsupported.
Res &= ~SanitizerKind::Function;
return Res;
}
Tool *WebAssembly::buildLinker() const {
return new tools::wasm::Linker(*this);
}
void WebAssembly::addLibCxxIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
const Driver &D = getDriver();
std::string SysRoot = computeSysRoot();
std::string LibPath = SysRoot + "/include";
const std::string MultiarchTriple =
getMultiarchTriple(D, getTriple(), SysRoot);
bool IsKnownOs = (getTriple().getOS() != llvm::Triple::UnknownOS);
std::string Version = detectLibcxxVersion(LibPath);
if (Version.empty())
return;
// First add the per-target include path if the OS is known.
if (IsKnownOs) {
std::string TargetDir = LibPath + "/" + MultiarchTriple + "/c++/" + Version;
addSystemInclude(DriverArgs, CC1Args, TargetDir);
}
// Second add the generic one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version);
}
void WebAssembly::addLibStdCXXIncludePaths(
const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
// We cannot use GCCInstallationDetector here as the sysroot usually does
// not contain a full GCC installation.
// Instead, we search the given sysroot for /usr/include/xx, similar
// to how we do it for libc++.
const Driver &D = getDriver();
std::string SysRoot = computeSysRoot();
std::string LibPath = SysRoot + "/include";
const std::string MultiarchTriple =
getMultiarchTriple(D, getTriple(), SysRoot);
bool IsKnownOs = (getTriple().getOS() != llvm::Triple::UnknownOS);
// This is similar to detectLibcxxVersion()
std::string Version;
{
std::error_code EC;
Generic_GCC::GCCVersion MaxVersion =
Generic_GCC::GCCVersion::Parse("0.0.0");
SmallString<128> Path(LibPath);
llvm::sys::path::append(Path, "c++");
for (llvm::vfs::directory_iterator LI = getVFS().dir_begin(Path, EC), LE;
!EC && LI != LE; LI = LI.increment(EC)) {
StringRef VersionText = llvm::sys::path::filename(LI->path());
if (VersionText[0] != 'v') {
auto Version = Generic_GCC::GCCVersion::Parse(VersionText);
if (Version > MaxVersion)
MaxVersion = Version;
}
}
if (MaxVersion.Major > 0)
Version = MaxVersion.Text;
}
if (Version.empty())
return;
// First add the per-target include path if the OS is known.
if (IsKnownOs) {
std::string TargetDir = LibPath + "/c++/" + Version + "/" + MultiarchTriple;
addSystemInclude(DriverArgs, CC1Args, TargetDir);
}
// Second add the generic one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version);
// Third the backward one.
addSystemInclude(DriverArgs, CC1Args, LibPath + "/c++/" + Version + "/backward");
}
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