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/LoongArch.h" 12 #include "Arch/Mips.h" 13 #include "Arch/PPC.h" 14 #include "Arch/RISCV.h" 15 #include "CommonArgs.h" 16 #include "clang/Config/config.h" 17 #include "clang/Driver/Distro.h" 18 #include "clang/Driver/Driver.h" 19 #include "clang/Driver/Options.h" 20 #include "clang/Driver/SanitizerArgs.h" 21 #include "llvm/Option/ArgList.h" 22 #include "llvm/ProfileData/InstrProf.h" 23 #include "llvm/Support/Path.h" 24 #include "llvm/Support/ScopedPrinter.h" 25 #include "llvm/Support/VirtualFileSystem.h" 26 #include <system_error> 27 28 using namespace clang::driver; 29 using namespace clang::driver::toolchains; 30 using namespace clang; 31 using namespace llvm::opt; 32 33 using tools::addPathIfExists; 34 35 /// Get our best guess at the multiarch triple for a target. 36 /// 37 /// Debian-based systems are starting to use a multiarch setup where they use 38 /// a target-triple directory in the library and header search paths. 39 /// Unfortunately, this triple does not align with the vanilla target triple, 40 /// so we provide a rough mapping here. 41 std::string Linux::getMultiarchTriple(const Driver &D, 42 const llvm::Triple &TargetTriple, 43 StringRef SysRoot) const { 44 llvm::Triple::EnvironmentType TargetEnvironment = 45 TargetTriple.getEnvironment(); 46 bool IsAndroid = TargetTriple.isAndroid(); 47 bool IsMipsR6 = TargetTriple.getSubArch() == llvm::Triple::MipsSubArch_r6; 48 bool IsMipsN32Abi = TargetTriple.getEnvironment() == llvm::Triple::GNUABIN32; 49 50 // For most architectures, just use whatever we have rather than trying to be 51 // clever. 52 switch (TargetTriple.getArch()) { 53 default: 54 break; 55 56 // We use the existence of '/lib/<triple>' as a directory to detect some 57 // common linux triples that don't quite match the Clang triple for both 58 // 32-bit and 64-bit targets. Multiarch fixes its install triples to these 59 // regardless of what the actual target triple is. 60 case llvm::Triple::arm: 61 case llvm::Triple::thumb: 62 if (IsAndroid) 63 return "arm-linux-androideabi"; 64 if (TargetEnvironment == llvm::Triple::GNUEABIHF || 65 TargetEnvironment == llvm::Triple::MuslEABIHF || 66 TargetEnvironment == llvm::Triple::EABIHF) 67 return "arm-linux-gnueabihf"; 68 return "arm-linux-gnueabi"; 69 case llvm::Triple::armeb: 70 case llvm::Triple::thumbeb: 71 if (TargetEnvironment == llvm::Triple::GNUEABIHF || 72 TargetEnvironment == llvm::Triple::MuslEABIHF || 73 TargetEnvironment == llvm::Triple::EABIHF) 74 return "armeb-linux-gnueabihf"; 75 return "armeb-linux-gnueabi"; 76 case llvm::Triple::x86: 77 if (IsAndroid) 78 return "i686-linux-android"; 79 return "i386-linux-gnu"; 80 case llvm::Triple::x86_64: 81 if (IsAndroid) 82 return "x86_64-linux-android"; 83 if (TargetEnvironment == llvm::Triple::GNUX32) 84 return "x86_64-linux-gnux32"; 85 return "x86_64-linux-gnu"; 86 case llvm::Triple::aarch64: 87 if (IsAndroid) 88 return "aarch64-linux-android"; 89 if (hasEffectiveTriple() && 90 getEffectiveTriple().getEnvironment() == llvm::Triple::PAuthTest) 91 return "aarch64-linux-pauthtest"; 92 return "aarch64-linux-gnu"; 93 case llvm::Triple::aarch64_be: 94 return "aarch64_be-linux-gnu"; 95 96 case llvm::Triple::loongarch64: { 97 const char *Libc; 98 const char *FPFlavor; 99 100 if (TargetTriple.isGNUEnvironment()) { 101 Libc = "gnu"; 102 } else if (TargetTriple.isMusl()) { 103 Libc = "musl"; 104 } else { 105 return TargetTriple.str(); 106 } 107 108 switch (TargetEnvironment) { 109 default: 110 return TargetTriple.str(); 111 case llvm::Triple::GNUSF: 112 FPFlavor = "sf"; 113 break; 114 case llvm::Triple::GNUF32: 115 FPFlavor = "f32"; 116 break; 117 case llvm::Triple::GNU: 118 case llvm::Triple::GNUF64: 119 // This was going to be "f64" in an earlier Toolchain Conventions 120 // revision, but starting from Feb 2023 the F64 ABI variants are 121 // unmarked in their canonical forms. 122 FPFlavor = ""; 123 break; 124 } 125 126 return (Twine("loongarch64-linux-") + Libc + FPFlavor).str(); 127 } 128 129 case llvm::Triple::m68k: 130 return "m68k-linux-gnu"; 131 132 case llvm::Triple::mips: 133 return IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu"; 134 case llvm::Triple::mipsel: 135 return IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu"; 136 case llvm::Triple::mips64: { 137 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") + 138 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 139 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 140 return MT; 141 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64-linux-gnu"))) 142 return "mips64-linux-gnu"; 143 break; 144 } 145 case llvm::Triple::mips64el: { 146 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") + 147 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 148 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 149 return MT; 150 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64el-linux-gnu"))) 151 return "mips64el-linux-gnu"; 152 break; 153 } 154 case llvm::Triple::ppc: 155 if (D.getVFS().exists(concat(SysRoot, "/lib/powerpc-linux-gnuspe"))) 156 return "powerpc-linux-gnuspe"; 157 return "powerpc-linux-gnu"; 158 case llvm::Triple::ppcle: 159 return "powerpcle-linux-gnu"; 160 case llvm::Triple::ppc64: 161 return "powerpc64-linux-gnu"; 162 case llvm::Triple::ppc64le: 163 return "powerpc64le-linux-gnu"; 164 case llvm::Triple::riscv64: 165 if (IsAndroid) 166 return "riscv64-linux-android"; 167 return "riscv64-linux-gnu"; 168 case llvm::Triple::sparc: 169 return "sparc-linux-gnu"; 170 case llvm::Triple::sparcv9: 171 return "sparc64-linux-gnu"; 172 case llvm::Triple::systemz: 173 return "s390x-linux-gnu"; 174 } 175 return TargetTriple.str(); 176 } 177 178 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) { 179 if (Triple.isMIPS()) { 180 if (Triple.isAndroid()) { 181 StringRef CPUName; 182 StringRef ABIName; 183 tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 184 if (CPUName == "mips32r6") 185 return "libr6"; 186 if (CPUName == "mips32r2") 187 return "libr2"; 188 } 189 // lib32 directory has a special meaning on MIPS targets. 190 // It contains N32 ABI binaries. Use this folder if produce 191 // code for N32 ABI only. 192 if (tools::mips::hasMipsAbiArg(Args, "n32")) 193 return "lib32"; 194 return Triple.isArch32Bit() ? "lib" : "lib64"; 195 } 196 197 // It happens that only x86, PPC and SPARC use the 'lib32' variant of 198 // oslibdir, and using that variant while targeting other architectures causes 199 // problems because the libraries are laid out in shared system roots that 200 // can't cope with a 'lib32' library search path being considered. So we only 201 // enable them when we know we may need it. 202 // 203 // FIXME: This is a bit of a hack. We should really unify this code for 204 // reasoning about oslibdir spellings with the lib dir spellings in the 205 // GCCInstallationDetector, but that is a more significant refactoring. 206 if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() || 207 Triple.getArch() == llvm::Triple::sparc) 208 return "lib32"; 209 210 if (Triple.getArch() == llvm::Triple::x86_64 && Triple.isX32()) 211 return "libx32"; 212 213 if (Triple.getArch() == llvm::Triple::riscv32) 214 return "lib32"; 215 216 return Triple.isArch32Bit() ? "lib" : "lib64"; 217 } 218 219 Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 220 : Generic_ELF(D, Triple, Args) { 221 GCCInstallation.init(Triple, Args); 222 Multilibs = GCCInstallation.getMultilibs(); 223 SelectedMultilibs.assign({GCCInstallation.getMultilib()}); 224 llvm::Triple::ArchType Arch = Triple.getArch(); 225 std::string SysRoot = computeSysRoot(); 226 ToolChain::path_list &PPaths = getProgramPaths(); 227 228 Generic_GCC::PushPPaths(PPaths); 229 230 Distro Distro(D.getVFS(), Triple); 231 232 if (Distro.IsAlpineLinux() || Triple.isAndroid()) { 233 ExtraOpts.push_back("-z"); 234 ExtraOpts.push_back("now"); 235 } 236 237 if (Distro.IsOpenSUSE() || Distro.IsUbuntu() || Distro.IsAlpineLinux() || 238 Triple.isAndroid()) { 239 ExtraOpts.push_back("-z"); 240 ExtraOpts.push_back("relro"); 241 } 242 243 // Note, lld from 11 onwards default max-page-size to 65536 for both ARM and 244 // AArch64. 245 if (Triple.isAndroid()) { 246 if (Triple.isARM()) { 247 // Android ARM uses max-page-size=4096 to reduce VMA usage. 248 ExtraOpts.push_back("-z"); 249 ExtraOpts.push_back("max-page-size=4096"); 250 } else if (Triple.isAArch64() || Triple.getArch() == llvm::Triple::x86_64) { 251 // Android AArch64 uses max-page-size=16384 to support 4k/16k page sizes. 252 // Android emulates a 16k page size for app testing on x86_64 machines. 253 ExtraOpts.push_back("-z"); 254 ExtraOpts.push_back("max-page-size=16384"); 255 } 256 } 257 258 if (GCCInstallation.getParentLibPath().contains("opt/rh/")) 259 // With devtoolset on RHEL, we want to add a bin directory that is relative 260 // to the detected gcc install, because if we are using devtoolset gcc then 261 // we want to use other tools from devtoolset (e.g. ld) instead of the 262 // standard system tools. 263 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 264 "/../bin").str()); 265 266 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 267 ExtraOpts.push_back("-X"); 268 269 const bool IsAndroid = Triple.isAndroid(); 270 const bool IsMips = Triple.isMIPS(); 271 const bool IsHexagon = Arch == llvm::Triple::hexagon; 272 const bool IsRISCV = Triple.isRISCV(); 273 const bool IsCSKY = Triple.isCSKY(); 274 275 if (IsCSKY && !SelectedMultilibs.empty()) 276 SysRoot = SysRoot + SelectedMultilibs.back().osSuffix(); 277 278 if ((IsMips || IsCSKY) && !SysRoot.empty()) 279 ExtraOpts.push_back("--sysroot=" + SysRoot); 280 281 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 282 // and the MIPS ABI require .dynsym to be sorted in different ways. 283 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 284 // ABI requires a mapping between the GOT and the symbol table. 285 // Android loader does not support .gnu.hash until API 23. 286 // Hexagon linker/loader does not support .gnu.hash 287 if (!IsMips && !IsHexagon) { 288 if (Distro.IsOpenSUSE() || Distro == Distro::UbuntuLucid || 289 Distro == Distro::UbuntuJaunty || Distro == Distro::UbuntuKarmic || 290 (IsAndroid && Triple.isAndroidVersionLT(23))) 291 ExtraOpts.push_back("--hash-style=both"); 292 else 293 ExtraOpts.push_back("--hash-style=gnu"); 294 } 295 296 #ifdef ENABLE_LINKER_BUILD_ID 297 ExtraOpts.push_back("--build-id"); 298 #endif 299 300 // The selection of paths to try here is designed to match the patterns which 301 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 302 // This was determined by running GCC in a fake filesystem, creating all 303 // possible permutations of these directories, and seeing which ones it added 304 // to the link paths. 305 path_list &Paths = getFilePaths(); 306 307 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 308 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 309 310 // mips32: Debian multilib, we use /libo32, while in other case, /lib is 311 // used. We need add both libo32 and /lib. 312 if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel) { 313 Generic_GCC::AddMultilibPaths(D, SysRoot, "libo32", MultiarchTriple, Paths); 314 addPathIfExists(D, concat(SysRoot, "/libo32"), Paths); 315 addPathIfExists(D, concat(SysRoot, "/usr/libo32"), Paths); 316 } 317 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 318 319 addPathIfExists(D, concat(SysRoot, "/lib", MultiarchTriple), Paths); 320 addPathIfExists(D, concat(SysRoot, "/lib/..", OSLibDir), Paths); 321 322 if (IsAndroid) { 323 // Android sysroots contain a library directory for each supported OS 324 // version as well as some unversioned libraries in the usual multiarch 325 // directory. 326 addPathIfExists( 327 D, 328 concat(SysRoot, "/usr/lib", MultiarchTriple, 329 llvm::to_string(Triple.getEnvironmentVersion().getMajor())), 330 Paths); 331 } 332 333 addPathIfExists(D, concat(SysRoot, "/usr/lib", MultiarchTriple), Paths); 334 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 335 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 336 // this here. 337 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 338 Triple.isArch64Bit()) 339 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir), Paths); 340 else 341 addPathIfExists(D, concat(SysRoot, "/usr/lib/..", OSLibDir), Paths); 342 if (IsRISCV) { 343 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 344 addPathIfExists(D, concat(SysRoot, "/", OSLibDir, ABIName), Paths); 345 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir, ABIName), Paths); 346 } 347 348 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 349 350 addPathIfExists(D, concat(SysRoot, "/lib"), Paths); 351 addPathIfExists(D, concat(SysRoot, "/usr/lib"), Paths); 352 } 353 354 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 355 if (getTriple().isAndroid()) 356 return ToolChain::RLT_CompilerRT; 357 return Generic_ELF::GetDefaultRuntimeLibType(); 358 } 359 360 unsigned Linux::GetDefaultDwarfVersion() const { 361 if (getTriple().isAndroid()) 362 return 4; 363 return ToolChain::GetDefaultDwarfVersion(); 364 } 365 366 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 367 if (getTriple().isAndroid()) 368 return ToolChain::CST_Libcxx; 369 return ToolChain::CST_Libstdcxx; 370 } 371 372 bool Linux::HasNativeLLVMSupport() const { return true; } 373 374 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 375 376 Tool *Linux::buildStaticLibTool() const { 377 return new tools::gnutools::StaticLibTool(*this); 378 } 379 380 Tool *Linux::buildAssembler() const { 381 return new tools::gnutools::Assembler(*this); 382 } 383 384 std::string Linux::computeSysRoot() const { 385 if (!getDriver().SysRoot.empty()) 386 return getDriver().SysRoot; 387 388 if (getTriple().isAndroid()) { 389 // Android toolchains typically include a sysroot at ../sysroot relative to 390 // the clang binary. 391 const StringRef ClangDir = getDriver().Dir; 392 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 393 if (getVFS().exists(AndroidSysRootPath)) 394 return AndroidSysRootPath; 395 } 396 397 if (getTriple().isCSKY()) { 398 // CSKY toolchains use different names for sysroot folder. 399 if (!GCCInstallation.isValid()) 400 return std::string(); 401 // GCCInstallation.getInstallPath() = 402 // $GCCToolchainPath/lib/gcc/csky-linux-gnuabiv2/6.3.0 403 // Path = $GCCToolchainPath/csky-linux-gnuabiv2/libc 404 std::string Path = (GCCInstallation.getInstallPath() + "/../../../../" + 405 GCCInstallation.getTriple().str() + "/libc") 406 .str(); 407 if (getVFS().exists(Path)) 408 return Path; 409 return std::string(); 410 } 411 412 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 413 return std::string(); 414 415 // Standalone MIPS toolchains use different names for sysroot folder 416 // and put it into different places. Here we try to check some known 417 // variants. 418 419 const StringRef InstallDir = GCCInstallation.getInstallPath(); 420 const StringRef TripleStr = GCCInstallation.getTriple().str(); 421 const Multilib &Multilib = GCCInstallation.getMultilib(); 422 423 std::string Path = 424 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 425 .str(); 426 427 if (getVFS().exists(Path)) 428 return Path; 429 430 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 431 432 if (getVFS().exists(Path)) 433 return Path; 434 435 return std::string(); 436 } 437 438 std::string Linux::getDynamicLinker(const ArgList &Args) const { 439 const llvm::Triple::ArchType Arch = getArch(); 440 const llvm::Triple &Triple = getTriple(); 441 442 const Distro Distro(getDriver().getVFS(), Triple); 443 444 if (Triple.isAndroid()) { 445 if (getSanitizerArgs(Args).needsHwasanRt() && 446 !Triple.isAndroidVersionLT(34) && Triple.isArch64Bit()) { 447 // On Android 14 and newer, there is a special linker_hwasan64 that 448 // allows to run HWASan binaries on non-HWASan system images. This 449 // is also available on HWASan system images, so we can just always 450 // use that instead. 451 return "/system/bin/linker_hwasan64"; 452 } 453 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 454 } 455 if (Triple.isMusl()) { 456 std::string ArchName; 457 bool IsArm = false; 458 459 switch (Arch) { 460 case llvm::Triple::arm: 461 case llvm::Triple::thumb: 462 ArchName = "arm"; 463 IsArm = true; 464 break; 465 case llvm::Triple::armeb: 466 case llvm::Triple::thumbeb: 467 ArchName = "armeb"; 468 IsArm = true; 469 break; 470 case llvm::Triple::x86: 471 ArchName = "i386"; 472 break; 473 case llvm::Triple::x86_64: 474 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 475 break; 476 default: 477 ArchName = Triple.getArchName().str(); 478 } 479 if (IsArm && 480 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 481 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 482 ArchName += "hf"; 483 if (Arch == llvm::Triple::ppc && 484 Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 485 ArchName = "powerpc-sf"; 486 487 return "/lib/ld-musl-" + ArchName + ".so.1"; 488 } 489 490 std::string LibDir; 491 std::string Loader; 492 493 switch (Arch) { 494 default: 495 llvm_unreachable("unsupported architecture"); 496 497 case llvm::Triple::aarch64: 498 LibDir = "lib"; 499 Loader = "ld-linux-aarch64.so.1"; 500 break; 501 case llvm::Triple::aarch64_be: 502 LibDir = "lib"; 503 Loader = "ld-linux-aarch64_be.so.1"; 504 break; 505 case llvm::Triple::arm: 506 case llvm::Triple::thumb: 507 case llvm::Triple::armeb: 508 case llvm::Triple::thumbeb: { 509 const bool HF = 510 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 511 Triple.getEnvironment() == llvm::Triple::GNUEABIHFT64 || 512 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 513 514 LibDir = "lib"; 515 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 516 break; 517 } 518 case llvm::Triple::loongarch32: { 519 LibDir = "lib32"; 520 Loader = 521 ("ld-linux-loongarch-" + 522 tools::loongarch::getLoongArchABI(getDriver(), Args, Triple) + ".so.1") 523 .str(); 524 break; 525 } 526 case llvm::Triple::loongarch64: { 527 LibDir = "lib64"; 528 Loader = 529 ("ld-linux-loongarch-" + 530 tools::loongarch::getLoongArchABI(getDriver(), Args, Triple) + ".so.1") 531 .str(); 532 break; 533 } 534 case llvm::Triple::m68k: 535 LibDir = "lib"; 536 Loader = "ld.so.1"; 537 break; 538 case llvm::Triple::mips: 539 case llvm::Triple::mipsel: 540 case llvm::Triple::mips64: 541 case llvm::Triple::mips64el: { 542 bool IsNaN2008 = tools::mips::isNaN2008(getDriver(), Args, Triple); 543 544 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 545 546 if (tools::mips::isUCLibc(Args)) 547 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 548 else if (!Triple.hasEnvironment() && 549 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 550 Loader = 551 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 552 else 553 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 554 555 break; 556 } 557 case llvm::Triple::ppc: 558 LibDir = "lib"; 559 Loader = "ld.so.1"; 560 break; 561 case llvm::Triple::ppcle: 562 LibDir = "lib"; 563 Loader = "ld.so.1"; 564 break; 565 case llvm::Triple::ppc64: 566 LibDir = "lib64"; 567 Loader = 568 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 569 break; 570 case llvm::Triple::ppc64le: 571 LibDir = "lib64"; 572 Loader = 573 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 574 break; 575 case llvm::Triple::riscv32: 576 case llvm::Triple::riscv64: { 577 StringRef ArchName = llvm::Triple::getArchTypeName(Arch); 578 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 579 LibDir = "lib"; 580 Loader = ("ld-linux-" + ArchName + "-" + ABIName + ".so.1").str(); 581 break; 582 } 583 case llvm::Triple::sparc: 584 case llvm::Triple::sparcel: 585 LibDir = "lib"; 586 Loader = "ld-linux.so.2"; 587 break; 588 case llvm::Triple::sparcv9: 589 LibDir = "lib64"; 590 Loader = "ld-linux.so.2"; 591 break; 592 case llvm::Triple::systemz: 593 LibDir = "lib"; 594 Loader = "ld64.so.1"; 595 break; 596 case llvm::Triple::x86: 597 LibDir = "lib"; 598 Loader = "ld-linux.so.2"; 599 break; 600 case llvm::Triple::x86_64: { 601 bool X32 = Triple.isX32(); 602 603 LibDir = X32 ? "libx32" : "lib64"; 604 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 605 break; 606 } 607 case llvm::Triple::ve: 608 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 609 case llvm::Triple::csky: { 610 LibDir = "lib"; 611 Loader = "ld.so.1"; 612 break; 613 } 614 } 615 616 if (Distro == Distro::Exherbo && 617 (Triple.getVendor() == llvm::Triple::UnknownVendor || 618 Triple.getVendor() == llvm::Triple::PC)) 619 return "/usr/" + Triple.str() + "/lib/" + Loader; 620 return "/" + LibDir + "/" + Loader; 621 } 622 623 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 624 ArgStringList &CC1Args) const { 625 const Driver &D = getDriver(); 626 std::string SysRoot = computeSysRoot(); 627 628 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 629 return; 630 631 // Add 'include' in the resource directory, which is similar to 632 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 633 // contains some files conflicting with system /usr/include. musl systems 634 // prefer the /usr/include copies which are more relevant. 635 SmallString<128> ResourceDirInclude(D.ResourceDir); 636 llvm::sys::path::append(ResourceDirInclude, "include"); 637 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 638 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 639 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 640 641 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 642 return; 643 644 // LOCAL_INCLUDE_DIR 645 addSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/local/include")); 646 // TOOL_INCLUDE_DIR 647 AddMultilibIncludeArgs(DriverArgs, CC1Args); 648 649 // Check for configure-time C include directories. 650 StringRef CIncludeDirs(C_INCLUDE_DIRS); 651 if (CIncludeDirs != "") { 652 SmallVector<StringRef, 5> dirs; 653 CIncludeDirs.split(dirs, ":"); 654 for (StringRef dir : dirs) { 655 StringRef Prefix = 656 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 657 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 658 } 659 return; 660 } 661 662 // On systems using multiarch and Android, add /usr/include/$triple before 663 // /usr/include. 664 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 665 if (!MultiarchIncludeDir.empty() && 666 D.getVFS().exists(concat(SysRoot, "/usr/include", MultiarchIncludeDir))) 667 addExternCSystemInclude( 668 DriverArgs, CC1Args, 669 concat(SysRoot, "/usr/include", MultiarchIncludeDir)); 670 671 if (getTriple().getOS() == llvm::Triple::RTEMS) 672 return; 673 674 // Add an include of '/include' directly. This isn't provided by default by 675 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 676 // add even when Clang is acting as-if it were a system compiler. 677 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include")); 678 679 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include")); 680 681 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 682 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 683 } 684 685 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 686 llvm::opt::ArgStringList &CC1Args) const { 687 // We need a detected GCC installation on Linux to provide libstdc++'s 688 // headers in odd Linuxish places. 689 if (!GCCInstallation.isValid()) 690 return; 691 692 // Detect Debian g++-multiarch-incdir.diff. 693 StringRef TripleStr = GCCInstallation.getTriple().str(); 694 StringRef DebianMultiarch = 695 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 696 ? "i386-linux-gnu" 697 : TripleStr; 698 699 // Try generic GCC detection first. 700 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 701 DebianMultiarch)) 702 return; 703 704 StringRef LibDir = GCCInstallation.getParentLibPath(); 705 const Multilib &Multilib = GCCInstallation.getMultilib(); 706 const GCCVersion &Version = GCCInstallation.getVersion(); 707 708 const std::string LibStdCXXIncludePathCandidates[] = { 709 // Android standalone toolchain has C++ headers in yet another place. 710 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 711 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 712 // without a subdirectory corresponding to the gcc version. 713 LibDir.str() + "/../include/c++", 714 // Cray's gcc installation puts headers under "g++" without a 715 // version suffix. 716 LibDir.str() + "/../include/g++", 717 }; 718 719 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 720 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 721 Multilib.includeSuffix(), DriverArgs, CC1Args)) 722 break; 723 } 724 } 725 726 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 727 ArgStringList &CC1Args) const { 728 CudaInstallation->AddCudaIncludeArgs(DriverArgs, CC1Args); 729 } 730 731 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 732 ArgStringList &CC1Args) const { 733 RocmInstallation->AddHIPIncludeArgs(DriverArgs, CC1Args); 734 } 735 736 void Linux::AddHIPRuntimeLibArgs(const ArgList &Args, 737 ArgStringList &CmdArgs) const { 738 CmdArgs.push_back( 739 Args.MakeArgString(StringRef("-L") + RocmInstallation->getLibPath())); 740 741 if (Args.hasFlag(options::OPT_frtlib_add_rpath, 742 options::OPT_fno_rtlib_add_rpath, false)) 743 CmdArgs.append( 744 {"-rpath", Args.MakeArgString(RocmInstallation->getLibPath())}); 745 746 CmdArgs.push_back("-lamdhip64"); 747 } 748 749 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 750 ArgStringList &CC1Args) const { 751 if (GCCInstallation.isValid()) { 752 CC1Args.push_back("-isystem"); 753 CC1Args.push_back(DriverArgs.MakeArgString( 754 GCCInstallation.getParentLibPath() + "/../" + 755 GCCInstallation.getTriple().str() + "/include")); 756 } 757 } 758 759 bool Linux::isPIEDefault(const llvm::opt::ArgList &Args) const { 760 return CLANG_DEFAULT_PIE_ON_LINUX || getTriple().isAndroid() || 761 getTriple().isMusl() || getSanitizerArgs(Args).requiresPIE(); 762 } 763 764 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 765 // Outline atomics for AArch64 are supported by compiler-rt 766 // and libgcc since 9.3.1 767 assert(getTriple().isAArch64() && "expected AArch64 target!"); 768 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 769 if (RtLib == ToolChain::RLT_CompilerRT) 770 return true; 771 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 772 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 773 return false; 774 return true; 775 } 776 777 bool Linux::IsMathErrnoDefault() const { 778 if (getTriple().isAndroid() || getTriple().isMusl()) 779 return false; 780 return Generic_ELF::IsMathErrnoDefault(); 781 } 782 783 SanitizerMask Linux::getSupportedSanitizers() const { 784 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 785 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 786 const bool IsMIPS = getTriple().isMIPS32(); 787 const bool IsMIPS64 = getTriple().isMIPS64(); 788 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 789 getTriple().getArch() == llvm::Triple::ppc64le; 790 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 791 getTriple().getArch() == llvm::Triple::aarch64_be; 792 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 793 getTriple().getArch() == llvm::Triple::thumb || 794 getTriple().getArch() == llvm::Triple::armeb || 795 getTriple().getArch() == llvm::Triple::thumbeb; 796 const bool IsLoongArch64 = getTriple().getArch() == llvm::Triple::loongarch64; 797 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 798 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 799 const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon; 800 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 801 Res |= SanitizerKind::Address; 802 Res |= SanitizerKind::PointerCompare; 803 Res |= SanitizerKind::PointerSubtract; 804 Res |= SanitizerKind::Fuzzer; 805 Res |= SanitizerKind::FuzzerNoLink; 806 Res |= SanitizerKind::KernelAddress; 807 Res |= SanitizerKind::Memory; 808 Res |= SanitizerKind::Vptr; 809 Res |= SanitizerKind::SafeStack; 810 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsLoongArch64) 811 Res |= SanitizerKind::DataFlow; 812 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 813 IsRISCV64 || IsSystemZ || IsHexagon || IsLoongArch64) 814 Res |= SanitizerKind::Leak; 815 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ || 816 IsLoongArch64 || IsRISCV64) 817 Res |= SanitizerKind::Thread; 818 if (IsX86_64 || IsSystemZ || IsPowerPC64) 819 Res |= SanitizerKind::KernelMemory; 820 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 821 IsPowerPC64 || IsHexagon || IsLoongArch64 || IsRISCV64) 822 Res |= SanitizerKind::Scudo; 823 if (IsX86_64 || IsAArch64 || IsRISCV64) { 824 Res |= SanitizerKind::HWAddress; 825 } 826 if (IsX86_64 || IsAArch64) { 827 Res |= SanitizerKind::KernelHWAddress; 828 } 829 if (IsX86_64) 830 Res |= SanitizerKind::NumericalStability; 831 832 // Work around "Cannot represent a difference across sections". 833 if (getTriple().getArch() == llvm::Triple::ppc64) 834 Res &= ~SanitizerKind::Function; 835 return Res; 836 } 837 838 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 839 llvm::opt::ArgStringList &CmdArgs) const { 840 // Add linker option -u__llvm_profile_runtime to cause runtime 841 // initialization module to be linked in. 842 if (needsProfileRT(Args)) 843 CmdArgs.push_back(Args.MakeArgString( 844 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 845 ToolChain::addProfileRTLibs(Args, CmdArgs); 846 } 847 848 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 849 for (const auto &Opt : ExtraOpts) 850 CmdArgs.push_back(Opt.c_str()); 851 } 852 853 const char *Linux::getDefaultLinker() const { 854 if (getTriple().isAndroid()) 855 return "ld.lld"; 856 return Generic_ELF::getDefaultLinker(); 857 } 858