1 //===--- Hurd.cpp - Hurd ToolChain Implementations --------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 #include "CommonArgs.h"
11 #include "clang/Config/config.h"
12 #include "clang/Driver/Driver.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/Support/Path.h"
15 #include "llvm/Support/VirtualFileSystem.h"
17 using namespace clang::driver;
18 using namespace clang::driver::toolchains;
19 using namespace clang;
20 using namespace llvm::opt;
22 using tools::addPathIfExists;
24 /// Get our best guess at the multiarch triple for a target.
26 /// Debian-based systems are starting to use a multiarch setup where they use
27 /// a target-triple directory in the library and header search paths.
28 /// Unfortunately, this triple does not align with the vanilla target triple,
29 /// so we provide a rough mapping here.
30 std::string Hurd::getMultiarchTriple(const Driver &D,
31 const llvm::Triple &TargetTriple,
32 StringRef SysRoot) const {
33 if (TargetTriple.getArch() == llvm::Triple::x86) {
34 // We use the existence of '/lib/<triple>' as a directory to detect some
35 // common hurd triples that don't quite match the Clang triple for both
36 // 32-bit and 64-bit targets. Multiarch fixes its install triples to these
37 // regardless of what the actual target triple is.
38 if (D.getVFS().exists(SysRoot + "/lib/i386-gnu"))
42 // For most architectures, just use whatever we have rather than trying to be
44 return TargetTriple.str();
47 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) {
48 // It happens that only x86 and PPC use the 'lib32' variant of oslibdir, and
49 // using that variant while targeting other architectures causes problems
50 // because the libraries are laid out in shared system roots that can't cope
51 // with a 'lib32' library search path being considered. So we only enable
52 // them when we know we may need it.
54 // FIXME: This is a bit of a hack. We should really unify this code for
55 // reasoning about oslibdir spellings with the lib dir spellings in the
56 // GCCInstallationDetector, but that is a more significant refactoring.
58 if (Triple.getArch() == llvm::Triple::x86)
61 return Triple.isArch32Bit() ? "lib" : "lib64";
64 Hurd::Hurd(const Driver &D, const llvm::Triple &Triple,
66 : Generic_ELF(D, Triple, Args) {
67 std::string SysRoot = computeSysRoot();
68 path_list &Paths = getFilePaths();
70 const std::string OSLibDir = getOSLibDir(Triple, Args);
71 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot);
73 #ifdef ENABLE_LINKER_BUILD_ID
74 ExtraOpts.push_back("--build-id");
77 // If we are currently running Clang inside of the requested system root, add
78 // its parent library paths to those searched.
79 // FIXME: It's not clear whether we should use the driver's installed
80 // directory ('Dir' below) or the ResourceDir.
81 if (StringRef(D.Dir).startswith(SysRoot)) {
82 addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths);
83 addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths);
86 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
87 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
89 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
90 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths);
92 // If we are currently running Clang inside of the requested system root, add
93 // its parent library path to those searched.
94 // FIXME: It's not clear whether we should use the driver's installed
95 // directory ('Dir' below) or the ResourceDir.
96 if (StringRef(D.Dir).startswith(SysRoot))
97 addPathIfExists(D, D.Dir + "/../lib", Paths);
99 addPathIfExists(D, SysRoot + "/lib", Paths);
100 addPathIfExists(D, SysRoot + "/usr/lib", Paths);
103 bool Hurd::HasNativeLLVMSupport() const { return true; }
105 Tool *Hurd::buildLinker() const { return new tools::gnutools::Linker(*this); }
107 Tool *Hurd::buildAssembler() const {
108 return new tools::gnutools::Assembler(*this);
111 std::string Hurd::computeSysRoot() const {
112 if (!getDriver().SysRoot.empty())
113 return getDriver().SysRoot;
115 return std::string();
118 std::string Hurd::getDynamicLinker(const ArgList &Args) const {
119 if (getArch() == llvm::Triple::x86)
122 llvm_unreachable("unsupported architecture");
125 void Hurd::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
126 ArgStringList &CC1Args) const {
127 const Driver &D = getDriver();
128 std::string SysRoot = computeSysRoot();
130 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc))
133 if (!DriverArgs.hasArg(options::OPT_nostdlibinc))
134 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include");
136 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) {
137 SmallString<128> P(D.ResourceDir);
138 llvm::sys::path::append(P, "include");
139 addSystemInclude(DriverArgs, CC1Args, P);
142 if (DriverArgs.hasArg(options::OPT_nostdlibinc))
145 // Check for configure-time C include directories.
146 StringRef CIncludeDirs(C_INCLUDE_DIRS);
147 if (CIncludeDirs != "") {
148 SmallVector<StringRef, 5> Dirs;
149 CIncludeDirs.split(Dirs, ":");
150 for (StringRef Dir : Dirs) {
152 llvm::sys::path::is_absolute(Dir) ? StringRef(SysRoot) : "";
153 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + Dir);
158 // Lacking those, try to detect the correct set of system includes for the
160 if (getTriple().getArch() == llvm::Triple::x86) {
161 std::string Path = SysRoot + "/usr/include/i386-gnu";
162 if (D.getVFS().exists(Path))
163 addExternCSystemInclude(DriverArgs, CC1Args, Path);
166 // Add an include of '/include' directly. This isn't provided by default by
167 // system GCCs, but is often used with cross-compiling GCCs, and harmless to
168 // add even when Clang is acting as-if it were a system compiler.
169 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include");
171 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include");