1 //===--- Hurd.cpp - Hurd ToolChain Implementations --------*- C++ -*-===// 2 // 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 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "Hurd.h" 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" 16 17 using namespace clang::driver; 18 using namespace clang::driver::toolchains; 19 using namespace clang; 20 using namespace llvm::opt; 21 22 using tools::addPathIfExists; 23 24 /// Get our best guess at the multiarch triple for a target. 25 /// 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")) 39 return "i386-gnu"; 40 } 41 42 // For most architectures, just use whatever we have rather than trying to be 43 // clever. 44 return TargetTriple.str(); 45 } 46 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. 53 // 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. 57 58 if (Triple.getArch() == llvm::Triple::x86) 59 return "lib32"; 60 61 return Triple.isArch32Bit() ? "lib" : "lib64"; 62 } 63 64 Hurd::Hurd(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 65 : Generic_ELF(D, Triple, Args) { 66 GCCInstallation.init(Triple, Args); 67 Multilibs = GCCInstallation.getMultilibs(); 68 SelectedMultilib = GCCInstallation.getMultilib(); 69 std::string SysRoot = computeSysRoot(); 70 ToolChain::path_list &PPaths = getProgramPaths(); 71 72 Generic_GCC::PushPPaths(PPaths); 73 74 // The selection of paths to try here is designed to match the patterns which 75 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 76 // This was determined by running GCC in a fake filesystem, creating all 77 // possible permutations of these directories, and seeing which ones it added 78 // to the link paths. 79 path_list &Paths = getFilePaths(); 80 81 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 82 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 83 84 #ifdef ENABLE_LINKER_BUILD_ID 85 ExtraOpts.push_back("--build-id"); 86 #endif 87 88 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 89 90 // Similar to the logic for GCC above, if we currently running Clang inside 91 // of the requested system root, add its parent library paths to 92 // those searched. 93 // FIXME: It's not clear whether we should use the driver's installed 94 // directory ('Dir' below) or the ResourceDir. 95 if (StringRef(D.Dir).startswith(SysRoot)) { 96 addPathIfExists(D, D.Dir + "/../lib/" + MultiarchTriple, Paths); 97 addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths); 98 } 99 100 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 101 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); 102 103 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 104 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 105 106 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 107 108 // Similar to the logic for GCC above, if we are currently running Clang 109 // inside of the requested system root, add its parent library path to those 110 // searched. 111 // FIXME: It's not clear whether we should use the driver's installed 112 // directory ('Dir' below) or the ResourceDir. 113 if (StringRef(D.Dir).startswith(SysRoot)) 114 addPathIfExists(D, D.Dir + "/../lib", Paths); 115 116 addPathIfExists(D, SysRoot + "/lib", Paths); 117 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 118 } 119 120 bool Hurd::HasNativeLLVMSupport() const { return true; } 121 122 Tool *Hurd::buildLinker() const { return new tools::gnutools::Linker(*this); } 123 124 Tool *Hurd::buildAssembler() const { 125 return new tools::gnutools::Assembler(*this); 126 } 127 128 std::string Hurd::computeSysRoot() const { 129 if (!getDriver().SysRoot.empty()) 130 return getDriver().SysRoot; 131 132 return std::string(); 133 } 134 135 std::string Hurd::getDynamicLinker(const ArgList &Args) const { 136 if (getArch() == llvm::Triple::x86) 137 return "/lib/ld.so"; 138 139 llvm_unreachable("unsupported architecture"); 140 } 141 142 void Hurd::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 143 ArgStringList &CC1Args) const { 144 const Driver &D = getDriver(); 145 std::string SysRoot = computeSysRoot(); 146 147 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 148 return; 149 150 if (!DriverArgs.hasArg(options::OPT_nostdlibinc)) 151 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 152 153 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) { 154 SmallString<128> P(D.ResourceDir); 155 llvm::sys::path::append(P, "include"); 156 addSystemInclude(DriverArgs, CC1Args, P); 157 } 158 159 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 160 return; 161 162 // Check for configure-time C include directories. 163 StringRef CIncludeDirs(C_INCLUDE_DIRS); 164 if (CIncludeDirs != "") { 165 SmallVector<StringRef, 5> Dirs; 166 CIncludeDirs.split(Dirs, ":"); 167 for (StringRef Dir : Dirs) { 168 StringRef Prefix = 169 llvm::sys::path::is_absolute(Dir) ? "" : StringRef(SysRoot); 170 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + Dir); 171 } 172 return; 173 } 174 175 // Lacking those, try to detect the correct set of system includes for the 176 // target triple. 177 178 AddMultilibIncludeArgs(DriverArgs, CC1Args); 179 180 if (getTriple().getArch() == llvm::Triple::x86) { 181 std::string Path = SysRoot + "/usr/include/i386-gnu"; 182 if (D.getVFS().exists(Path)) 183 addExternCSystemInclude(DriverArgs, CC1Args, Path); 184 } 185 186 // Add an include of '/include' directly. This isn't provided by default by 187 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 188 // add even when Clang is acting as-if it were a system compiler. 189 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 190 191 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 192 } 193 194 void Hurd::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 195 for (const auto &Opt : ExtraOpts) 196 CmdArgs.push_back(Opt.c_str()); 197 } 198