1 //===--- Linux.h - Linux 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 "Linux.h" 10 #include "Arch/ARM.h" 11 #include "Arch/Mips.h" 12 #include "Arch/PPC.h" 13 #include "Arch/RISCV.h" 14 #include "CommonArgs.h" 15 #include "clang/Config/config.h" 16 #include "clang/Driver/Distro.h" 17 #include "clang/Driver/Driver.h" 18 #include "clang/Driver/Options.h" 19 #include "clang/Driver/SanitizerArgs.h" 20 #include "llvm/Option/ArgList.h" 21 #include "llvm/ProfileData/InstrProf.h" 22 #include "llvm/Support/Path.h" 23 #include "llvm/Support/ScopedPrinter.h" 24 #include "llvm/Support/VirtualFileSystem.h" 25 #include <system_error> 26 27 using namespace clang::driver; 28 using namespace clang::driver::toolchains; 29 using namespace clang; 30 using namespace llvm::opt; 31 32 using tools::addPathIfExists; 33 34 /// Get our best guess at the multiarch triple for a target. 35 /// 36 /// Debian-based systems are starting to use a multiarch setup where they use 37 /// a target-triple directory in the library and header search paths. 38 /// Unfortunately, this triple does not align with the vanilla target triple, 39 /// so we provide a rough mapping here. 40 std::string Linux::getMultiarchTriple(const Driver &D, 41 const llvm::Triple &TargetTriple, 42 StringRef SysRoot) const { 43 llvm::Triple::EnvironmentType TargetEnvironment = 44 TargetTriple.getEnvironment(); 45 bool IsAndroid = TargetTriple.isAndroid(); 46 bool IsMipsR6 = TargetTriple.getSubArch() == llvm::Triple::MipsSubArch_r6; 47 bool IsMipsN32Abi = TargetTriple.getEnvironment() == llvm::Triple::GNUABIN32; 48 49 // For most architectures, just use whatever we have rather than trying to be 50 // clever. 51 switch (TargetTriple.getArch()) { 52 default: 53 break; 54 55 // We use the existence of '/lib/<triple>' as a directory to detect some 56 // common linux triples that don't quite match the Clang triple for both 57 // 32-bit and 64-bit targets. Multiarch fixes its install triples to these 58 // regardless of what the actual target triple is. 59 case llvm::Triple::arm: 60 case llvm::Triple::thumb: 61 if (IsAndroid) 62 return "arm-linux-androideabi"; 63 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 64 return "arm-linux-gnueabihf"; 65 return "arm-linux-gnueabi"; 66 case llvm::Triple::armeb: 67 case llvm::Triple::thumbeb: 68 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 69 return "armeb-linux-gnueabihf"; 70 return "armeb-linux-gnueabi"; 71 case llvm::Triple::x86: 72 if (IsAndroid) 73 return "i686-linux-android"; 74 return "i386-linux-gnu"; 75 case llvm::Triple::x86_64: 76 if (IsAndroid) 77 return "x86_64-linux-android"; 78 if (TargetEnvironment == llvm::Triple::GNUX32) 79 return "x86_64-linux-gnux32"; 80 return "x86_64-linux-gnu"; 81 case llvm::Triple::aarch64: 82 if (IsAndroid) 83 return "aarch64-linux-android"; 84 return "aarch64-linux-gnu"; 85 case llvm::Triple::aarch64_be: 86 return "aarch64_be-linux-gnu"; 87 88 case llvm::Triple::m68k: 89 return "m68k-linux-gnu"; 90 91 case llvm::Triple::mips: 92 return IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu"; 93 case llvm::Triple::mipsel: 94 if (IsAndroid) 95 return "mipsel-linux-android"; 96 return IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu"; 97 case llvm::Triple::mips64: { 98 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") + 99 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 100 if (D.getVFS().exists(SysRoot + "/lib/" + MT)) 101 return MT; 102 if (D.getVFS().exists(SysRoot + "/lib/mips64-linux-gnu")) 103 return "mips64-linux-gnu"; 104 break; 105 } 106 case llvm::Triple::mips64el: { 107 if (IsAndroid) 108 return "mips64el-linux-android"; 109 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") + 110 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 111 if (D.getVFS().exists(SysRoot + "/lib/" + MT)) 112 return MT; 113 if (D.getVFS().exists(SysRoot + "/lib/mips64el-linux-gnu")) 114 return "mips64el-linux-gnu"; 115 break; 116 } 117 case llvm::Triple::ppc: 118 if (D.getVFS().exists(SysRoot + "/lib/powerpc-linux-gnuspe")) 119 return "powerpc-linux-gnuspe"; 120 return "powerpc-linux-gnu"; 121 case llvm::Triple::ppcle: 122 return "powerpcle-linux-gnu"; 123 case llvm::Triple::ppc64: 124 return "powerpc64-linux-gnu"; 125 case llvm::Triple::ppc64le: 126 return "powerpc64le-linux-gnu"; 127 case llvm::Triple::sparc: 128 return "sparc-linux-gnu"; 129 case llvm::Triple::sparcv9: 130 return "sparc64-linux-gnu"; 131 case llvm::Triple::systemz: 132 return "s390x-linux-gnu"; 133 } 134 return TargetTriple.str(); 135 } 136 137 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) { 138 if (Triple.isMIPS()) { 139 if (Triple.isAndroid()) { 140 StringRef CPUName; 141 StringRef ABIName; 142 tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 143 if (CPUName == "mips32r6") 144 return "libr6"; 145 if (CPUName == "mips32r2") 146 return "libr2"; 147 } 148 // lib32 directory has a special meaning on MIPS targets. 149 // It contains N32 ABI binaries. Use this folder if produce 150 // code for N32 ABI only. 151 if (tools::mips::hasMipsAbiArg(Args, "n32")) 152 return "lib32"; 153 return Triple.isArch32Bit() ? "lib" : "lib64"; 154 } 155 156 // It happens that only x86, PPC and SPARC use the 'lib32' variant of 157 // oslibdir, and using that variant while targeting other architectures causes 158 // problems because the libraries are laid out in shared system roots that 159 // can't cope with a 'lib32' library search path being considered. So we only 160 // enable them when we know we may need it. 161 // 162 // FIXME: This is a bit of a hack. We should really unify this code for 163 // reasoning about oslibdir spellings with the lib dir spellings in the 164 // GCCInstallationDetector, but that is a more significant refactoring. 165 if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() || 166 Triple.getArch() == llvm::Triple::sparc) 167 return "lib32"; 168 169 if (Triple.getArch() == llvm::Triple::x86_64 && Triple.isX32()) 170 return "libx32"; 171 172 if (Triple.getArch() == llvm::Triple::riscv32) 173 return "lib32"; 174 175 return Triple.isArch32Bit() ? "lib" : "lib64"; 176 } 177 178 Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 179 : Generic_ELF(D, Triple, Args) { 180 GCCInstallation.init(Triple, Args); 181 Multilibs = GCCInstallation.getMultilibs(); 182 SelectedMultilib = GCCInstallation.getMultilib(); 183 llvm::Triple::ArchType Arch = Triple.getArch(); 184 std::string SysRoot = computeSysRoot(); 185 ToolChain::path_list &PPaths = getProgramPaths(); 186 187 Generic_GCC::PushPPaths(PPaths); 188 189 Distro Distro(D.getVFS(), Triple); 190 191 if (Distro.IsAlpineLinux() || Triple.isAndroid()) { 192 ExtraOpts.push_back("-z"); 193 ExtraOpts.push_back("now"); 194 } 195 196 if (Distro.IsOpenSUSE() || Distro.IsUbuntu() || Distro.IsAlpineLinux() || 197 Triple.isAndroid()) { 198 ExtraOpts.push_back("-z"); 199 ExtraOpts.push_back("relro"); 200 } 201 202 // Android ARM/AArch64 use max-page-size=4096 to reduce VMA usage. Note, lld 203 // from 11 onwards default max-page-size to 65536 for both ARM and AArch64. 204 if ((Triple.isARM() || Triple.isAArch64()) && Triple.isAndroid()) { 205 ExtraOpts.push_back("-z"); 206 ExtraOpts.push_back("max-page-size=4096"); 207 } 208 209 if (GCCInstallation.getParentLibPath().contains("opt/rh/")) 210 // With devtoolset on RHEL, we want to add a bin directory that is relative 211 // to the detected gcc install, because if we are using devtoolset gcc then 212 // we want to use other tools from devtoolset (e.g. ld) instead of the 213 // standard system tools. 214 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 215 "/../bin").str()); 216 217 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 218 ExtraOpts.push_back("-X"); 219 220 const bool IsAndroid = Triple.isAndroid(); 221 const bool IsMips = Triple.isMIPS(); 222 const bool IsHexagon = Arch == llvm::Triple::hexagon; 223 const bool IsRISCV = Triple.isRISCV(); 224 225 if (IsMips && !SysRoot.empty()) 226 ExtraOpts.push_back("--sysroot=" + SysRoot); 227 228 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 229 // and the MIPS ABI require .dynsym to be sorted in different ways. 230 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 231 // ABI requires a mapping between the GOT and the symbol table. 232 // Android loader does not support .gnu.hash until API 23. 233 // Hexagon linker/loader does not support .gnu.hash 234 if (!IsMips && !IsHexagon) { 235 if (Distro.IsRedhat() || Distro.IsOpenSUSE() || Distro.IsAlpineLinux() || 236 (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick) || 237 (IsAndroid && !Triple.isAndroidVersionLT(23))) 238 ExtraOpts.push_back("--hash-style=gnu"); 239 240 if (Distro.IsDebian() || Distro.IsOpenSUSE() || 241 Distro == Distro::UbuntuLucid || Distro == Distro::UbuntuJaunty || 242 Distro == Distro::UbuntuKarmic || 243 (IsAndroid && Triple.isAndroidVersionLT(23))) 244 ExtraOpts.push_back("--hash-style=both"); 245 } 246 247 #ifdef ENABLE_LINKER_BUILD_ID 248 ExtraOpts.push_back("--build-id"); 249 #endif 250 251 if (IsAndroid || Distro.IsOpenSUSE()) 252 ExtraOpts.push_back("--enable-new-dtags"); 253 254 // The selection of paths to try here is designed to match the patterns which 255 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 256 // This was determined by running GCC in a fake filesystem, creating all 257 // possible permutations of these directories, and seeing which ones it added 258 // to the link paths. 259 path_list &Paths = getFilePaths(); 260 261 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 262 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 263 const std::string &ExtraPath = D.OverlayToolChainPath; 264 265 if (!D.OverlayToolChainPath.empty()) { 266 addPathIfExists(D, ExtraPath + "/lib/" + MultiarchTriple, Paths); 267 addPathIfExists(D, ExtraPath + "/lib/../" + OSLibDir, Paths); 268 addPathIfExists(D, ExtraPath + "/usr/lib/" + MultiarchTriple, Paths); 269 addPathIfExists(D, ExtraPath + "/usr/lib/../" + OSLibDir, Paths); 270 } 271 272 // mips32: Debian multilib, we use /libo32, while in other case, /lib is 273 // used. We need add both libo32 and /lib. 274 if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel) { 275 Generic_GCC::AddMultilibPaths(D, SysRoot, "libo32", MultiarchTriple, Paths); 276 addPathIfExists(D, SysRoot + "/libo32", Paths); 277 addPathIfExists(D, SysRoot + "/usr/libo32", Paths); 278 } 279 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 280 281 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 282 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); 283 284 if (IsAndroid) { 285 // Android sysroots contain a library directory for each supported OS 286 // version as well as some unversioned libraries in the usual multiarch 287 // directory. 288 addPathIfExists( 289 D, 290 SysRoot + "/usr/lib/" + MultiarchTriple + "/" + 291 llvm::to_string(Triple.getEnvironmentVersion().getMajor()), 292 Paths); 293 } 294 295 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 296 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 297 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 298 // this here. 299 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 300 Triple.isArch64Bit()) 301 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir, Paths); 302 else 303 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 304 if (IsRISCV) { 305 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 306 addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); 307 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); 308 } 309 310 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 311 312 // The deprecated -DLLVM_ENABLE_PROJECTS=libcxx configuration installs 313 // libc++.so in D.Dir+"/../lib/". Detect this path. 314 // TODO Remove once LLVM_ENABLE_PROJECTS=libcxx is unsupported. 315 if (StringRef(D.Dir).startswith(SysRoot) && 316 D.getVFS().exists(D.Dir + "/../lib/libc++.so")) 317 addPathIfExists(D, D.Dir + "/../lib", Paths); 318 319 if (!D.OverlayToolChainPath.empty()) { 320 addPathIfExists(D, ExtraPath + "/lib", Paths); 321 addPathIfExists(D, ExtraPath + "/usr/lib", Paths); 322 } 323 324 addPathIfExists(D, SysRoot + "/lib", Paths); 325 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 326 } 327 328 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 329 if (getTriple().isAndroid()) 330 return ToolChain::RLT_CompilerRT; 331 return Generic_ELF::GetDefaultRuntimeLibType(); 332 } 333 334 unsigned Linux::GetDefaultDwarfVersion() const { 335 if (getTriple().isAndroid()) 336 return 4; 337 return ToolChain::GetDefaultDwarfVersion(); 338 } 339 340 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 341 if (getTriple().isAndroid()) 342 return ToolChain::CST_Libcxx; 343 return ToolChain::CST_Libstdcxx; 344 } 345 346 bool Linux::HasNativeLLVMSupport() const { return true; } 347 348 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 349 350 Tool *Linux::buildStaticLibTool() const { 351 return new tools::gnutools::StaticLibTool(*this); 352 } 353 354 Tool *Linux::buildAssembler() const { 355 return new tools::gnutools::Assembler(*this); 356 } 357 358 std::string Linux::computeSysRoot() const { 359 if (!getDriver().SysRoot.empty()) 360 return getDriver().SysRoot; 361 362 if (getTriple().isAndroid()) { 363 // Android toolchains typically include a sysroot at ../sysroot relative to 364 // the clang binary. 365 const StringRef ClangDir = getDriver().getInstalledDir(); 366 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 367 if (getVFS().exists(AndroidSysRootPath)) 368 return AndroidSysRootPath; 369 } 370 371 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 372 return std::string(); 373 374 // Standalone MIPS toolchains use different names for sysroot folder 375 // and put it into different places. Here we try to check some known 376 // variants. 377 378 const StringRef InstallDir = GCCInstallation.getInstallPath(); 379 const StringRef TripleStr = GCCInstallation.getTriple().str(); 380 const Multilib &Multilib = GCCInstallation.getMultilib(); 381 382 std::string Path = 383 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 384 .str(); 385 386 if (getVFS().exists(Path)) 387 return Path; 388 389 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 390 391 if (getVFS().exists(Path)) 392 return Path; 393 394 return std::string(); 395 } 396 397 std::string Linux::getDynamicLinker(const ArgList &Args) const { 398 const llvm::Triple::ArchType Arch = getArch(); 399 const llvm::Triple &Triple = getTriple(); 400 401 const Distro Distro(getDriver().getVFS(), Triple); 402 403 if (Triple.isAndroid()) 404 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 405 406 if (Triple.isMusl()) { 407 std::string ArchName; 408 bool IsArm = false; 409 410 switch (Arch) { 411 case llvm::Triple::arm: 412 case llvm::Triple::thumb: 413 ArchName = "arm"; 414 IsArm = true; 415 break; 416 case llvm::Triple::armeb: 417 case llvm::Triple::thumbeb: 418 ArchName = "armeb"; 419 IsArm = true; 420 break; 421 case llvm::Triple::x86: 422 ArchName = "i386"; 423 break; 424 case llvm::Triple::x86_64: 425 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 426 break; 427 default: 428 ArchName = Triple.getArchName().str(); 429 } 430 if (IsArm && 431 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 432 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 433 ArchName += "hf"; 434 if (Arch == llvm::Triple::ppc && 435 Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 436 ArchName = "powerpc-sf"; 437 438 return "/lib/ld-musl-" + ArchName + ".so.1"; 439 } 440 441 std::string LibDir; 442 std::string Loader; 443 444 switch (Arch) { 445 default: 446 llvm_unreachable("unsupported architecture"); 447 448 case llvm::Triple::aarch64: 449 LibDir = "lib"; 450 Loader = "ld-linux-aarch64.so.1"; 451 break; 452 case llvm::Triple::aarch64_be: 453 LibDir = "lib"; 454 Loader = "ld-linux-aarch64_be.so.1"; 455 break; 456 case llvm::Triple::arm: 457 case llvm::Triple::thumb: 458 case llvm::Triple::armeb: 459 case llvm::Triple::thumbeb: { 460 const bool HF = 461 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 462 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 463 464 LibDir = "lib"; 465 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 466 break; 467 } 468 case llvm::Triple::m68k: 469 LibDir = "lib"; 470 Loader = "ld.so.1"; 471 break; 472 case llvm::Triple::mips: 473 case llvm::Triple::mipsel: 474 case llvm::Triple::mips64: 475 case llvm::Triple::mips64el: { 476 bool IsNaN2008 = tools::mips::isNaN2008(getDriver(), Args, Triple); 477 478 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 479 480 if (tools::mips::isUCLibc(Args)) 481 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 482 else if (!Triple.hasEnvironment() && 483 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 484 Loader = 485 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 486 else 487 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 488 489 break; 490 } 491 case llvm::Triple::ppc: 492 LibDir = "lib"; 493 Loader = "ld.so.1"; 494 break; 495 case llvm::Triple::ppcle: 496 LibDir = "lib"; 497 Loader = "ld.so.1"; 498 break; 499 case llvm::Triple::ppc64: 500 LibDir = "lib64"; 501 Loader = 502 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 503 break; 504 case llvm::Triple::ppc64le: 505 LibDir = "lib64"; 506 Loader = 507 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 508 break; 509 case llvm::Triple::riscv32: { 510 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 511 LibDir = "lib"; 512 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 513 break; 514 } 515 case llvm::Triple::riscv64: { 516 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 517 LibDir = "lib"; 518 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 519 break; 520 } 521 case llvm::Triple::sparc: 522 case llvm::Triple::sparcel: 523 LibDir = "lib"; 524 Loader = "ld-linux.so.2"; 525 break; 526 case llvm::Triple::sparcv9: 527 LibDir = "lib64"; 528 Loader = "ld-linux.so.2"; 529 break; 530 case llvm::Triple::systemz: 531 LibDir = "lib"; 532 Loader = "ld64.so.1"; 533 break; 534 case llvm::Triple::x86: 535 LibDir = "lib"; 536 Loader = "ld-linux.so.2"; 537 break; 538 case llvm::Triple::x86_64: { 539 bool X32 = Triple.isX32(); 540 541 LibDir = X32 ? "libx32" : "lib64"; 542 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 543 break; 544 } 545 case llvm::Triple::ve: 546 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 547 } 548 549 if (Distro == Distro::Exherbo && 550 (Triple.getVendor() == llvm::Triple::UnknownVendor || 551 Triple.getVendor() == llvm::Triple::PC)) 552 return "/usr/" + Triple.str() + "/lib/" + Loader; 553 return "/" + LibDir + "/" + Loader; 554 } 555 556 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 557 ArgStringList &CC1Args) const { 558 const Driver &D = getDriver(); 559 std::string SysRoot = computeSysRoot(); 560 561 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 562 return; 563 564 // Add 'include' in the resource directory, which is similar to 565 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 566 // contains some files conflicting with system /usr/include. musl systems 567 // prefer the /usr/include copies which are more relevant. 568 SmallString<128> ResourceDirInclude(D.ResourceDir); 569 llvm::sys::path::append(ResourceDirInclude, "include"); 570 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 571 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 572 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 573 574 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 575 return; 576 577 if (!D.OverlayToolChainPath.empty()) 578 addExternCSystemInclude(DriverArgs, CC1Args, 579 D.OverlayToolChainPath + "/include"); 580 581 // LOCAL_INCLUDE_DIR 582 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 583 // TOOL_INCLUDE_DIR 584 AddMultilibIncludeArgs(DriverArgs, CC1Args); 585 586 // Check for configure-time C include directories. 587 StringRef CIncludeDirs(C_INCLUDE_DIRS); 588 if (CIncludeDirs != "") { 589 SmallVector<StringRef, 5> dirs; 590 CIncludeDirs.split(dirs, ":"); 591 for (StringRef dir : dirs) { 592 StringRef Prefix = 593 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 594 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 595 } 596 return; 597 } 598 599 // On systems using multiarch and Android, add /usr/include/$triple before 600 // /usr/include. 601 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 602 if (!MultiarchIncludeDir.empty() && 603 D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir)) 604 addExternCSystemInclude(DriverArgs, CC1Args, 605 SysRoot + "/usr/include/" + MultiarchIncludeDir); 606 607 if (getTriple().getOS() == llvm::Triple::RTEMS) 608 return; 609 610 // Add an include of '/include' directly. This isn't provided by default by 611 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 612 // add even when Clang is acting as-if it were a system compiler. 613 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 614 615 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 616 617 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 618 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 619 } 620 621 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 622 llvm::opt::ArgStringList &CC1Args) const { 623 // We need a detected GCC installation on Linux to provide libstdc++'s 624 // headers in odd Linuxish places. 625 if (!GCCInstallation.isValid()) 626 return; 627 628 // Detect Debian g++-multiarch-incdir.diff. 629 StringRef TripleStr = GCCInstallation.getTriple().str(); 630 StringRef DebianMultiarch = 631 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 632 ? "i386-linux-gnu" 633 : TripleStr; 634 635 // Try generic GCC detection first. 636 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 637 DebianMultiarch)) 638 return; 639 640 StringRef LibDir = GCCInstallation.getParentLibPath(); 641 const Multilib &Multilib = GCCInstallation.getMultilib(); 642 const GCCVersion &Version = GCCInstallation.getVersion(); 643 644 const std::string LibStdCXXIncludePathCandidates[] = { 645 // Android standalone toolchain has C++ headers in yet another place. 646 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 647 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 648 // without a subdirectory corresponding to the gcc version. 649 LibDir.str() + "/../include/c++", 650 // Cray's gcc installation puts headers under "g++" without a 651 // version suffix. 652 LibDir.str() + "/../include/g++", 653 }; 654 655 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 656 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 657 Multilib.includeSuffix(), DriverArgs, CC1Args)) 658 break; 659 } 660 } 661 662 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 663 ArgStringList &CC1Args) const { 664 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args); 665 } 666 667 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 668 ArgStringList &CC1Args) const { 669 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args); 670 } 671 672 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 673 ArgStringList &CC1Args) const { 674 if (GCCInstallation.isValid()) { 675 CC1Args.push_back("-isystem"); 676 CC1Args.push_back(DriverArgs.MakeArgString( 677 GCCInstallation.getParentLibPath() + "/../" + 678 GCCInstallation.getTriple().str() + "/include")); 679 } 680 } 681 682 bool Linux::isPIEDefault(const llvm::opt::ArgList &Args) const { 683 return CLANG_DEFAULT_PIE_ON_LINUX || getTriple().isAndroid() || 684 getTriple().isMusl() || getSanitizerArgs(Args).requiresPIE(); 685 } 686 687 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 688 // Outline atomics for AArch64 are supported by compiler-rt 689 // and libgcc since 9.3.1 690 assert(getTriple().isAArch64() && "expected AArch64 target!"); 691 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 692 if (RtLib == ToolChain::RLT_CompilerRT) 693 return true; 694 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 695 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 696 return false; 697 return true; 698 } 699 700 bool Linux::IsMathErrnoDefault() const { 701 if (getTriple().isAndroid() || getTriple().isMusl()) 702 return false; 703 return Generic_ELF::IsMathErrnoDefault(); 704 } 705 706 SanitizerMask Linux::getSupportedSanitizers() const { 707 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 708 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 709 const bool IsMIPS = getTriple().isMIPS32(); 710 const bool IsMIPS64 = getTriple().isMIPS64(); 711 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 712 getTriple().getArch() == llvm::Triple::ppc64le; 713 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 714 getTriple().getArch() == llvm::Triple::aarch64_be; 715 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 716 getTriple().getArch() == llvm::Triple::thumb || 717 getTriple().getArch() == llvm::Triple::armeb || 718 getTriple().getArch() == llvm::Triple::thumbeb; 719 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 720 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 721 const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon; 722 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 723 Res |= SanitizerKind::Address; 724 Res |= SanitizerKind::PointerCompare; 725 Res |= SanitizerKind::PointerSubtract; 726 Res |= SanitizerKind::Fuzzer; 727 Res |= SanitizerKind::FuzzerNoLink; 728 Res |= SanitizerKind::KernelAddress; 729 Res |= SanitizerKind::Memory; 730 Res |= SanitizerKind::Vptr; 731 Res |= SanitizerKind::SafeStack; 732 if (IsX86_64 || IsMIPS64 || IsAArch64) 733 Res |= SanitizerKind::DataFlow; 734 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 735 IsRISCV64 || IsSystemZ || IsHexagon) 736 Res |= SanitizerKind::Leak; 737 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ) 738 Res |= SanitizerKind::Thread; 739 if (IsX86_64) 740 Res |= SanitizerKind::KernelMemory; 741 if (IsX86 || IsX86_64) 742 Res |= SanitizerKind::Function; 743 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 744 IsPowerPC64 || IsHexagon) 745 Res |= SanitizerKind::Scudo; 746 if (IsX86_64 || IsAArch64) { 747 Res |= SanitizerKind::HWAddress; 748 Res |= SanitizerKind::KernelHWAddress; 749 } 750 return Res; 751 } 752 753 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 754 llvm::opt::ArgStringList &CmdArgs) const { 755 // Add linker option -u__llvm_profile_runtime to cause runtime 756 // initialization module to be linked in. 757 if (needsProfileRT(Args)) 758 CmdArgs.push_back(Args.MakeArgString( 759 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 760 ToolChain::addProfileRTLibs(Args, CmdArgs); 761 } 762 763 llvm::DenormalMode 764 Linux::getDefaultDenormalModeForType(const llvm::opt::ArgList &DriverArgs, 765 const JobAction &JA, 766 const llvm::fltSemantics *FPType) const { 767 switch (getTriple().getArch()) { 768 case llvm::Triple::x86: 769 case llvm::Triple::x86_64: { 770 std::string Unused; 771 // DAZ and FTZ are turned on in crtfastmath.o 772 if (!DriverArgs.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) && 773 isFastMathRuntimeAvailable(DriverArgs, Unused)) 774 return llvm::DenormalMode::getPreserveSign(); 775 return llvm::DenormalMode::getIEEE(); 776 } 777 default: 778 return llvm::DenormalMode::getIEEE(); 779 } 780 } 781 782 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 783 for (const auto &Opt : ExtraOpts) 784 CmdArgs.push_back(Opt.c_str()); 785 } 786