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//===--- Hurd.cpp - Hurd 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 "Hurd.h"
#include "CommonArgs.h"
#include "clang/Config/config.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Options.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
using namespace clang::driver;
using namespace clang::driver::toolchains;
using namespace clang;
using namespace llvm::opt;
using tools::addPathIfExists;
/// Get our best guess at the multiarch triple for a target.
///
/// Debian-based systems are starting to use a multiarch setup where they use
/// a target-triple directory in the library and header search paths.
/// Unfortunately, this triple does not align with the vanilla target triple,
/// so we provide a rough mapping here.
std::string Hurd::getMultiarchTriple(const Driver &D,
const llvm::Triple &TargetTriple,
StringRef SysRoot) const {
switch (TargetTriple.getArch()) {
default:
break;
case llvm::Triple::x86:
// We use the existence of '/lib/<triple>' as a directory to detect some
// common hurd 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.
if (D.getVFS().exists(SysRoot + "/lib/i386-gnu"))
return "i386-gnu";
break;
case llvm::Triple::x86_64:
return "x86_64-gnu";
}
// For most architectures, just use whatever we have rather than trying to be
// clever.
return TargetTriple.str();
}
static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
// It happens that only x86 and PPC use the 'lib32' variant of oslibdir, and
// using that variant while targeting other architectures causes problems
// because the libraries are laid out in shared system roots that can't cope
// with a 'lib32' library search path being considered. So we only enable
// them when we know we may need it.
//
// FIXME: This is a bit of a hack. We should really unify this code for
// reasoning about oslibdir spellings with the lib dir spellings in the
// GCCInstallationDetector, but that is a more significant refactoring.
if (Triple.getArch() == llvm::Triple::x86)
return "lib32";
return Triple.isArch32Bit() ? "lib" : "lib64";
}
Hurd::Hurd(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
: Generic_ELF(D, Triple, Args) {
GCCInstallation.init(Triple, Args);
Multilibs = GCCInstallation.getMultilibs();
SelectedMultilibs.assign({GCCInstallation.getMultilib()});
std::string SysRoot = computeSysRoot();
ToolChain::path_list &PPaths = getProgramPaths();
Generic_GCC::PushPPaths(PPaths);
// The selection of paths to try here is designed to match the patterns which
// the GCC driver itself uses, as this is part of the GCC-compatible driver.
// This was determined by running GCC in a fake filesystem, creating all
// possible permutations of these directories, and seeing which ones it added
// to the link paths.
path_list &Paths = getFilePaths();
const std::string OSLibDir = std::string(getOSLibDir(Triple, Args));
const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
#ifdef ENABLE_LINKER_BUILD_ID
ExtraOpts.push_back("--build-id");
#endif
Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths);
// Similar to the logic for GCC above, if we currently running Clang inside
// of the requested system root, add its parent library paths to
// those searched.
// FIXME: It's not clear whether we should use the driver's installed
// directory ('Dir' below) or the ResourceDir.
if (StringRef(D.Dir).starts_with(SysRoot)) {
addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths);
addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
}
addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths);
// Similar to the logic for GCC above, if we are currently running Clang
// inside of the requested system root, add its parent library path to those
// searched.
// FIXME: It's not clear whether we should use the driver's installed
// directory ('Dir' below) or the ResourceDir.
if (StringRef(D.Dir).starts_with(SysRoot))
addPathIfExists(D, D.Dir + "/../lib", Paths);
addPathIfExists(D, SysRoot + "/lib", Paths);
addPathIfExists(D, SysRoot + "/usr/lib", Paths);
}
bool Hurd::HasNativeLLVMSupport() const { return true; }
Tool *Hurd::buildLinker() const { return new tools::gnutools::Linker(*this); }
Tool *Hurd::buildAssembler() const {
return new tools::gnutools::Assembler(*this);
}
std::string Hurd::getDynamicLinker(const ArgList &Args) const {
switch (getArch()) {
case llvm::Triple::x86:
return "/lib/ld.so";
case llvm::Triple::x86_64:
return "/lib/ld-x86-64.so.1";
default:
break;
}
llvm_unreachable("unsupported architecture");
}
void Hurd::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
ArgStringList &CC1Args) const {
const Driver &D = getDriver();
std::string SysRoot = computeSysRoot();
if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
return;
if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
addSystemInclude(DriverArgs, CC1Args, 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(SysRoot);
addExternCSystemInclude(DriverArgs, CC1Args, Prefix + Dir);
}
return;
}
// Lacking those, try to detect the correct set of system includes for the
// target triple.
AddMultilibIncludeArgs(DriverArgs, CC1Args);
// On systems using multiarch, add /usr/include/$triple before
// /usr/include.
std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot);
if (!MultiarchIncludeDir.empty() &&
D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir))
addExternCSystemInclude(DriverArgs, CC1Args,
SysRoot + "/usr/include/" + MultiarchIncludeDir);
// Add an include of '/include' directly. This isn't provided by default by
// system GCCs, but is often used with cross-compiling GCCs, and harmless to
// add even when Clang is acting as-if it were a system compiler.
addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");
}
void Hurd::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
llvm::opt::ArgStringList &CC1Args) const {
// We need a detected GCC installation on Linux to provide libstdc++'s
// headers in odd Linuxish places.
if (!GCCInstallation.isValid())
return;
StringRef TripleStr = GCCInstallation.getTriple().str();
StringRef DebianMultiarch =
GCCInstallation.getTriple().getArch() == llvm::Triple::x86 ? "i386-gnu"
: TripleStr;
addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, DebianMultiarch);
}
void Hurd::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const {
for (const auto &Opt : ExtraOpts)
CmdArgs.push_back(Opt.c_str());
}
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