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 case llvm::Triple::MuslSF: 113 FPFlavor = "sf"; 114 break; 115 case llvm::Triple::GNUF32: 116 case llvm::Triple::MuslF32: 117 FPFlavor = "f32"; 118 break; 119 case llvm::Triple::GNU: 120 case llvm::Triple::GNUF64: 121 case llvm::Triple::Musl: 122 // This was going to be "f64" in an earlier Toolchain Conventions 123 // revision, but starting from Feb 2023 the F64 ABI variants are 124 // unmarked in their canonical forms. 125 FPFlavor = ""; 126 break; 127 } 128 129 return (Twine("loongarch64-linux-") + Libc + FPFlavor).str(); 130 } 131 132 case llvm::Triple::m68k: 133 return "m68k-linux-gnu"; 134 135 case llvm::Triple::mips: 136 return IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu"; 137 case llvm::Triple::mipsel: 138 return IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu"; 139 case llvm::Triple::mips64: { 140 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") + 141 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 142 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 143 return MT; 144 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64-linux-gnu"))) 145 return "mips64-linux-gnu"; 146 break; 147 } 148 case llvm::Triple::mips64el: { 149 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") + 150 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 151 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 152 return MT; 153 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64el-linux-gnu"))) 154 return "mips64el-linux-gnu"; 155 break; 156 } 157 case llvm::Triple::ppc: 158 if (D.getVFS().exists(concat(SysRoot, "/lib/powerpc-linux-gnuspe"))) 159 return "powerpc-linux-gnuspe"; 160 return "powerpc-linux-gnu"; 161 case llvm::Triple::ppcle: 162 return "powerpcle-linux-gnu"; 163 case llvm::Triple::ppc64: 164 return "powerpc64-linux-gnu"; 165 case llvm::Triple::ppc64le: 166 return "powerpc64le-linux-gnu"; 167 case llvm::Triple::riscv64: 168 if (IsAndroid) 169 return "riscv64-linux-android"; 170 return "riscv64-linux-gnu"; 171 case llvm::Triple::sparc: 172 return "sparc-linux-gnu"; 173 case llvm::Triple::sparcv9: 174 return "sparc64-linux-gnu"; 175 case llvm::Triple::systemz: 176 return "s390x-linux-gnu"; 177 } 178 return TargetTriple.str(); 179 } 180 181 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) { 182 if (Triple.isMIPS()) { 183 // lib32 directory has a special meaning on MIPS targets. 184 // It contains N32 ABI binaries. Use this folder if produce 185 // code for N32 ABI only. 186 if (tools::mips::hasMipsAbiArg(Args, "n32")) 187 return "lib32"; 188 return Triple.isArch32Bit() ? "lib" : "lib64"; 189 } 190 191 // It happens that only x86, PPC and SPARC use the 'lib32' variant of 192 // oslibdir, and using that variant while targeting other architectures causes 193 // problems because the libraries are laid out in shared system roots that 194 // can't cope with a 'lib32' library search path being considered. So we only 195 // enable them when we know we may need it. 196 // 197 // FIXME: This is a bit of a hack. We should really unify this code for 198 // reasoning about oslibdir spellings with the lib dir spellings in the 199 // GCCInstallationDetector, but that is a more significant refactoring. 200 if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() || 201 Triple.getArch() == llvm::Triple::sparc) 202 return "lib32"; 203 204 if (Triple.getArch() == llvm::Triple::x86_64 && Triple.isX32()) 205 return "libx32"; 206 207 if (Triple.getArch() == llvm::Triple::riscv32) 208 return "lib32"; 209 210 return Triple.isArch32Bit() ? "lib" : "lib64"; 211 } 212 213 Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 214 : Generic_ELF(D, Triple, Args) { 215 GCCInstallation.init(Triple, Args); 216 Multilibs = GCCInstallation.getMultilibs(); 217 SelectedMultilibs.assign({GCCInstallation.getMultilib()}); 218 llvm::Triple::ArchType Arch = Triple.getArch(); 219 std::string SysRoot = computeSysRoot(); 220 ToolChain::path_list &PPaths = getProgramPaths(); 221 222 Generic_GCC::PushPPaths(PPaths); 223 224 Distro Distro(D.getVFS(), Triple); 225 226 if (Distro.IsAlpineLinux() || Triple.isAndroid()) { 227 ExtraOpts.push_back("-z"); 228 ExtraOpts.push_back("now"); 229 } 230 231 if (Distro.IsOpenSUSE() || Distro.IsUbuntu() || Distro.IsAlpineLinux() || 232 Triple.isAndroid()) { 233 ExtraOpts.push_back("-z"); 234 ExtraOpts.push_back("relro"); 235 } 236 237 // Note, lld from 11 onwards default max-page-size to 65536 for both ARM and 238 // AArch64. 239 if (Triple.isAndroid()) { 240 if (Triple.isARM()) { 241 // Android ARM uses max-page-size=4096 to reduce VMA usage. 242 ExtraOpts.push_back("-z"); 243 ExtraOpts.push_back("max-page-size=4096"); 244 } else if (Triple.isAArch64() || Triple.getArch() == llvm::Triple::x86_64) { 245 // Android AArch64 uses max-page-size=16384 to support 4k/16k page sizes. 246 // Android emulates a 16k page size for app testing on x86_64 machines. 247 ExtraOpts.push_back("-z"); 248 ExtraOpts.push_back("max-page-size=16384"); 249 } 250 if (Triple.isAndroidVersionLT(29)) { 251 // https://github.com/android/ndk/issues/1196 252 // The unwinder used by the crash handler on versions of Android prior to 253 // API 29 did not correctly handle binaries built with rosegment, which is 254 // enabled by default for LLD. Android only supports LLD, so it's not an 255 // issue that this flag is not accepted by other linkers. 256 ExtraOpts.push_back("--no-rosegment"); 257 } 258 if (!Triple.isAndroidVersionLT(28)) { 259 // Android supports relr packing starting with API 28 and had its own 260 // flavor (--pack-dyn-relocs=android) starting in API 23. 261 // TODO: It's possible to use both with --pack-dyn-relocs=android+relr, 262 // but we need to gather some data on the impact of that form before we 263 // can know if it's a good default. 264 // On the other hand, relr should always be an improvement. 265 ExtraOpts.push_back("--use-android-relr-tags"); 266 ExtraOpts.push_back("--pack-dyn-relocs=relr"); 267 } 268 } 269 270 if (GCCInstallation.getParentLibPath().contains("opt/rh/")) 271 // With devtoolset on RHEL, we want to add a bin directory that is relative 272 // to the detected gcc install, because if we are using devtoolset gcc then 273 // we want to use other tools from devtoolset (e.g. ld) instead of the 274 // standard system tools. 275 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 276 "/../bin").str()); 277 278 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 279 ExtraOpts.push_back("-X"); 280 281 const bool IsAndroid = Triple.isAndroid(); 282 const bool IsMips = Triple.isMIPS(); 283 const bool IsHexagon = Arch == llvm::Triple::hexagon; 284 const bool IsRISCV = Triple.isRISCV(); 285 const bool IsCSKY = Triple.isCSKY(); 286 287 if (IsCSKY && !SelectedMultilibs.empty()) 288 SysRoot = SysRoot + SelectedMultilibs.back().osSuffix(); 289 290 if ((IsMips || IsCSKY) && !SysRoot.empty()) 291 ExtraOpts.push_back("--sysroot=" + SysRoot); 292 293 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 294 // and the MIPS ABI require .dynsym to be sorted in different ways. 295 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 296 // ABI requires a mapping between the GOT and the symbol table. 297 // Android loader does not support .gnu.hash until API 23. 298 // Hexagon linker/loader does not support .gnu.hash 299 if (!IsMips && !IsHexagon) { 300 if (Distro.IsOpenSUSE() || Distro == Distro::UbuntuLucid || 301 Distro == Distro::UbuntuJaunty || Distro == Distro::UbuntuKarmic || 302 (IsAndroid && Triple.isAndroidVersionLT(23))) 303 ExtraOpts.push_back("--hash-style=both"); 304 else 305 ExtraOpts.push_back("--hash-style=gnu"); 306 } 307 308 #ifdef ENABLE_LINKER_BUILD_ID 309 ExtraOpts.push_back("--build-id"); 310 #endif 311 312 // The selection of paths to try here is designed to match the patterns which 313 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 314 // This was determined by running GCC in a fake filesystem, creating all 315 // possible permutations of these directories, and seeing which ones it added 316 // to the link paths. 317 path_list &Paths = getFilePaths(); 318 319 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 320 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 321 322 // mips32: Debian multilib, we use /libo32, while in other case, /lib is 323 // used. We need add both libo32 and /lib. 324 if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel) { 325 Generic_GCC::AddMultilibPaths(D, SysRoot, "libo32", MultiarchTriple, Paths); 326 addPathIfExists(D, concat(SysRoot, "/libo32"), Paths); 327 addPathIfExists(D, concat(SysRoot, "/usr/libo32"), Paths); 328 } 329 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 330 331 addPathIfExists(D, concat(SysRoot, "/lib", MultiarchTriple), Paths); 332 addPathIfExists(D, concat(SysRoot, "/lib/..", OSLibDir), Paths); 333 334 if (IsAndroid) { 335 // Android sysroots contain a library directory for each supported OS 336 // version as well as some unversioned libraries in the usual multiarch 337 // directory. 338 addPathIfExists( 339 D, 340 concat(SysRoot, "/usr/lib", MultiarchTriple, 341 llvm::to_string(Triple.getEnvironmentVersion().getMajor())), 342 Paths); 343 } 344 345 addPathIfExists(D, concat(SysRoot, "/usr/lib", MultiarchTriple), Paths); 346 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 347 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 348 // this here. 349 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 350 Triple.isArch64Bit()) 351 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir), Paths); 352 else 353 addPathIfExists(D, concat(SysRoot, "/usr/lib/..", OSLibDir), Paths); 354 if (IsRISCV) { 355 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 356 addPathIfExists(D, concat(SysRoot, "/", OSLibDir, ABIName), Paths); 357 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir, ABIName), Paths); 358 } 359 360 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 361 362 addPathIfExists(D, concat(SysRoot, "/lib"), Paths); 363 addPathIfExists(D, concat(SysRoot, "/usr/lib"), Paths); 364 } 365 366 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 367 if (getTriple().isAndroid()) 368 return ToolChain::RLT_CompilerRT; 369 return Generic_ELF::GetDefaultRuntimeLibType(); 370 } 371 372 unsigned Linux::GetDefaultDwarfVersion() const { 373 if (getTriple().isAndroid()) 374 return 4; 375 return ToolChain::GetDefaultDwarfVersion(); 376 } 377 378 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 379 if (getTriple().isAndroid()) 380 return ToolChain::CST_Libcxx; 381 return ToolChain::CST_Libstdcxx; 382 } 383 384 bool Linux::HasNativeLLVMSupport() const { return true; } 385 386 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 387 388 Tool *Linux::buildStaticLibTool() const { 389 return new tools::gnutools::StaticLibTool(*this); 390 } 391 392 Tool *Linux::buildAssembler() const { 393 return new tools::gnutools::Assembler(*this); 394 } 395 396 std::string Linux::computeSysRoot() const { 397 if (!getDriver().SysRoot.empty()) 398 return getDriver().SysRoot; 399 400 if (getTriple().isAndroid()) { 401 // Android toolchains typically include a sysroot at ../sysroot relative to 402 // the clang binary. 403 const StringRef ClangDir = getDriver().Dir; 404 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 405 if (getVFS().exists(AndroidSysRootPath)) 406 return AndroidSysRootPath; 407 } 408 409 if (getTriple().isCSKY()) { 410 // CSKY toolchains use different names for sysroot folder. 411 if (!GCCInstallation.isValid()) 412 return std::string(); 413 // GCCInstallation.getInstallPath() = 414 // $GCCToolchainPath/lib/gcc/csky-linux-gnuabiv2/6.3.0 415 // Path = $GCCToolchainPath/csky-linux-gnuabiv2/libc 416 std::string Path = (GCCInstallation.getInstallPath() + "/../../../../" + 417 GCCInstallation.getTriple().str() + "/libc") 418 .str(); 419 if (getVFS().exists(Path)) 420 return Path; 421 return std::string(); 422 } 423 424 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 425 return std::string(); 426 427 // Standalone MIPS toolchains use different names for sysroot folder 428 // and put it into different places. Here we try to check some known 429 // variants. 430 431 const StringRef InstallDir = GCCInstallation.getInstallPath(); 432 const StringRef TripleStr = GCCInstallation.getTriple().str(); 433 const Multilib &Multilib = GCCInstallation.getMultilib(); 434 435 std::string Path = 436 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 437 .str(); 438 439 if (getVFS().exists(Path)) 440 return Path; 441 442 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 443 444 if (getVFS().exists(Path)) 445 return Path; 446 447 return std::string(); 448 } 449 450 std::string Linux::getDynamicLinker(const ArgList &Args) const { 451 const llvm::Triple::ArchType Arch = getArch(); 452 const llvm::Triple &Triple = getTriple(); 453 454 const Distro Distro(getDriver().getVFS(), Triple); 455 456 if (Triple.isAndroid()) { 457 if (getSanitizerArgs(Args).needsHwasanRt() && 458 !Triple.isAndroidVersionLT(34) && Triple.isArch64Bit()) { 459 // On Android 14 and newer, there is a special linker_hwasan64 that 460 // allows to run HWASan binaries on non-HWASan system images. This 461 // is also available on HWASan system images, so we can just always 462 // use that instead. 463 return "/system/bin/linker_hwasan64"; 464 } 465 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 466 } 467 if (Triple.isMusl()) { 468 std::string ArchName; 469 bool IsArm = false; 470 471 switch (Arch) { 472 case llvm::Triple::arm: 473 case llvm::Triple::thumb: 474 ArchName = "arm"; 475 IsArm = true; 476 break; 477 case llvm::Triple::armeb: 478 case llvm::Triple::thumbeb: 479 ArchName = "armeb"; 480 IsArm = true; 481 break; 482 case llvm::Triple::x86: 483 ArchName = "i386"; 484 break; 485 case llvm::Triple::x86_64: 486 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 487 break; 488 default: 489 ArchName = Triple.getArchName().str(); 490 } 491 if (IsArm && 492 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 493 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 494 ArchName += "hf"; 495 if (Arch == llvm::Triple::ppc && 496 Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 497 ArchName = "powerpc-sf"; 498 499 return "/lib/ld-musl-" + ArchName + ".so.1"; 500 } 501 502 std::string LibDir; 503 std::string Loader; 504 505 switch (Arch) { 506 default: 507 llvm_unreachable("unsupported architecture"); 508 509 case llvm::Triple::aarch64: 510 LibDir = "lib"; 511 Loader = "ld-linux-aarch64.so.1"; 512 break; 513 case llvm::Triple::aarch64_be: 514 LibDir = "lib"; 515 Loader = "ld-linux-aarch64_be.so.1"; 516 break; 517 case llvm::Triple::arm: 518 case llvm::Triple::thumb: 519 case llvm::Triple::armeb: 520 case llvm::Triple::thumbeb: { 521 const bool HF = 522 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 523 Triple.getEnvironment() == llvm::Triple::GNUEABIHFT64 || 524 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 525 526 LibDir = "lib"; 527 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 528 break; 529 } 530 case llvm::Triple::loongarch32: { 531 LibDir = "lib32"; 532 Loader = 533 ("ld-linux-loongarch-" + 534 tools::loongarch::getLoongArchABI(getDriver(), Args, Triple) + ".so.1") 535 .str(); 536 break; 537 } 538 case llvm::Triple::loongarch64: { 539 LibDir = "lib64"; 540 Loader = 541 ("ld-linux-loongarch-" + 542 tools::loongarch::getLoongArchABI(getDriver(), Args, Triple) + ".so.1") 543 .str(); 544 break; 545 } 546 case llvm::Triple::m68k: 547 LibDir = "lib"; 548 Loader = "ld.so.1"; 549 break; 550 case llvm::Triple::mips: 551 case llvm::Triple::mipsel: 552 case llvm::Triple::mips64: 553 case llvm::Triple::mips64el: { 554 bool IsNaN2008 = tools::mips::isNaN2008(getDriver(), Args, Triple); 555 556 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 557 558 if (tools::mips::isUCLibc(Args)) 559 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 560 else if (!Triple.hasEnvironment() && 561 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 562 Loader = 563 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 564 else 565 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 566 567 break; 568 } 569 case llvm::Triple::ppc: 570 LibDir = "lib"; 571 Loader = "ld.so.1"; 572 break; 573 case llvm::Triple::ppcle: 574 LibDir = "lib"; 575 Loader = "ld.so.1"; 576 break; 577 case llvm::Triple::ppc64: 578 LibDir = "lib64"; 579 Loader = 580 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 581 break; 582 case llvm::Triple::ppc64le: 583 LibDir = "lib64"; 584 Loader = 585 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 586 break; 587 case llvm::Triple::riscv32: 588 case llvm::Triple::riscv64: { 589 StringRef ArchName = llvm::Triple::getArchTypeName(Arch); 590 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 591 LibDir = "lib"; 592 Loader = ("ld-linux-" + ArchName + "-" + ABIName + ".so.1").str(); 593 break; 594 } 595 case llvm::Triple::sparc: 596 case llvm::Triple::sparcel: 597 LibDir = "lib"; 598 Loader = "ld-linux.so.2"; 599 break; 600 case llvm::Triple::sparcv9: 601 LibDir = "lib64"; 602 Loader = "ld-linux.so.2"; 603 break; 604 case llvm::Triple::systemz: 605 LibDir = "lib"; 606 Loader = "ld64.so.1"; 607 break; 608 case llvm::Triple::x86: 609 LibDir = "lib"; 610 Loader = "ld-linux.so.2"; 611 break; 612 case llvm::Triple::x86_64: { 613 bool X32 = Triple.isX32(); 614 615 LibDir = X32 ? "libx32" : "lib64"; 616 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 617 break; 618 } 619 case llvm::Triple::ve: 620 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 621 case llvm::Triple::csky: { 622 LibDir = "lib"; 623 Loader = "ld.so.1"; 624 break; 625 } 626 } 627 628 if (Distro == Distro::Exherbo && 629 (Triple.getVendor() == llvm::Triple::UnknownVendor || 630 Triple.getVendor() == llvm::Triple::PC)) 631 return "/usr/" + Triple.str() + "/lib/" + Loader; 632 return "/" + LibDir + "/" + Loader; 633 } 634 635 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 636 ArgStringList &CC1Args) const { 637 const Driver &D = getDriver(); 638 std::string SysRoot = computeSysRoot(); 639 640 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 641 return; 642 643 // Add 'include' in the resource directory, which is similar to 644 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 645 // contains some files conflicting with system /usr/include. musl systems 646 // prefer the /usr/include copies which are more relevant. 647 SmallString<128> ResourceDirInclude(D.ResourceDir); 648 llvm::sys::path::append(ResourceDirInclude, "include"); 649 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 650 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 651 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 652 653 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 654 return; 655 656 // LOCAL_INCLUDE_DIR 657 addSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/local/include")); 658 // TOOL_INCLUDE_DIR 659 AddMultilibIncludeArgs(DriverArgs, CC1Args); 660 661 // Check for configure-time C include directories. 662 StringRef CIncludeDirs(C_INCLUDE_DIRS); 663 if (CIncludeDirs != "") { 664 SmallVector<StringRef, 5> dirs; 665 CIncludeDirs.split(dirs, ":"); 666 for (StringRef dir : dirs) { 667 StringRef Prefix = 668 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 669 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 670 } 671 return; 672 } 673 674 // On systems using multiarch and Android, add /usr/include/$triple before 675 // /usr/include. 676 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 677 if (!MultiarchIncludeDir.empty() && 678 D.getVFS().exists(concat(SysRoot, "/usr/include", MultiarchIncludeDir))) 679 addExternCSystemInclude( 680 DriverArgs, CC1Args, 681 concat(SysRoot, "/usr/include", MultiarchIncludeDir)); 682 683 if (getTriple().getOS() == llvm::Triple::RTEMS) 684 return; 685 686 // Add an include of '/include' directly. This isn't provided by default by 687 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 688 // add even when Clang is acting as-if it were a system compiler. 689 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include")); 690 691 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include")); 692 693 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 694 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 695 } 696 697 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 698 llvm::opt::ArgStringList &CC1Args) const { 699 // We need a detected GCC installation on Linux to provide libstdc++'s 700 // headers in odd Linuxish places. 701 if (!GCCInstallation.isValid()) 702 return; 703 704 // Detect Debian g++-multiarch-incdir.diff. 705 StringRef TripleStr = GCCInstallation.getTriple().str(); 706 StringRef DebianMultiarch = 707 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 708 ? "i386-linux-gnu" 709 : TripleStr; 710 711 // Try generic GCC detection first. 712 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 713 DebianMultiarch)) 714 return; 715 716 StringRef LibDir = GCCInstallation.getParentLibPath(); 717 const Multilib &Multilib = GCCInstallation.getMultilib(); 718 const GCCVersion &Version = GCCInstallation.getVersion(); 719 720 const std::string LibStdCXXIncludePathCandidates[] = { 721 // Android standalone toolchain has C++ headers in yet another place. 722 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 723 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 724 // without a subdirectory corresponding to the gcc version. 725 LibDir.str() + "/../include/c++", 726 // Cray's gcc installation puts headers under "g++" without a 727 // version suffix. 728 LibDir.str() + "/../include/g++", 729 }; 730 731 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 732 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 733 Multilib.includeSuffix(), DriverArgs, CC1Args)) 734 break; 735 } 736 } 737 738 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 739 ArgStringList &CC1Args) const { 740 CudaInstallation->AddCudaIncludeArgs(DriverArgs, CC1Args); 741 } 742 743 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 744 ArgStringList &CC1Args) const { 745 RocmInstallation->AddHIPIncludeArgs(DriverArgs, CC1Args); 746 } 747 748 void Linux::AddHIPRuntimeLibArgs(const ArgList &Args, 749 ArgStringList &CmdArgs) const { 750 CmdArgs.push_back( 751 Args.MakeArgString(StringRef("-L") + RocmInstallation->getLibPath())); 752 753 if (Args.hasFlag(options::OPT_frtlib_add_rpath, 754 options::OPT_fno_rtlib_add_rpath, false)) 755 CmdArgs.append( 756 {"-rpath", Args.MakeArgString(RocmInstallation->getLibPath())}); 757 758 CmdArgs.push_back("-lamdhip64"); 759 } 760 761 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 762 ArgStringList &CC1Args) const { 763 if (GCCInstallation.isValid()) { 764 CC1Args.push_back("-isystem"); 765 CC1Args.push_back(DriverArgs.MakeArgString( 766 GCCInstallation.getParentLibPath() + "/../" + 767 GCCInstallation.getTriple().str() + "/include")); 768 } 769 } 770 771 void Linux::addSYCLIncludeArgs(const ArgList &DriverArgs, 772 ArgStringList &CC1Args) const { 773 SYCLInstallation->addSYCLIncludeArgs(DriverArgs, CC1Args); 774 } 775 776 bool Linux::isPIEDefault(const llvm::opt::ArgList &Args) const { 777 return CLANG_DEFAULT_PIE_ON_LINUX || getTriple().isAndroid() || 778 getTriple().isMusl() || getSanitizerArgs(Args).requiresPIE(); 779 } 780 781 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 782 // Outline atomics for AArch64 are supported by compiler-rt 783 // and libgcc since 9.3.1 784 assert(getTriple().isAArch64() && "expected AArch64 target!"); 785 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 786 if (RtLib == ToolChain::RLT_CompilerRT) 787 return true; 788 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 789 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 790 return false; 791 return true; 792 } 793 794 bool Linux::IsMathErrnoDefault() const { 795 if (getTriple().isAndroid() || getTriple().isMusl()) 796 return false; 797 return Generic_ELF::IsMathErrnoDefault(); 798 } 799 800 SanitizerMask Linux::getSupportedSanitizers() const { 801 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 802 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 803 const bool IsMIPS = getTriple().isMIPS32(); 804 const bool IsMIPS64 = getTriple().isMIPS64(); 805 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 806 getTriple().getArch() == llvm::Triple::ppc64le; 807 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 808 getTriple().getArch() == llvm::Triple::aarch64_be; 809 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 810 getTriple().getArch() == llvm::Triple::thumb || 811 getTriple().getArch() == llvm::Triple::armeb || 812 getTriple().getArch() == llvm::Triple::thumbeb; 813 const bool IsLoongArch64 = getTriple().getArch() == llvm::Triple::loongarch64; 814 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 815 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 816 const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon; 817 const bool IsAndroid = getTriple().isAndroid(); 818 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 819 Res |= SanitizerKind::Address; 820 Res |= SanitizerKind::PointerCompare; 821 Res |= SanitizerKind::PointerSubtract; 822 Res |= SanitizerKind::Realtime; 823 Res |= SanitizerKind::Fuzzer; 824 Res |= SanitizerKind::FuzzerNoLink; 825 Res |= SanitizerKind::KernelAddress; 826 Res |= SanitizerKind::Vptr; 827 Res |= SanitizerKind::SafeStack; 828 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsLoongArch64) 829 Res |= SanitizerKind::DataFlow; 830 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 831 IsRISCV64 || IsSystemZ || IsHexagon || IsLoongArch64) 832 Res |= SanitizerKind::Leak; 833 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ || 834 IsLoongArch64 || IsRISCV64) 835 Res |= SanitizerKind::Thread; 836 if (IsX86_64 || IsAArch64) 837 Res |= SanitizerKind::Type; 838 if (IsX86_64 || IsSystemZ || IsPowerPC64) 839 Res |= SanitizerKind::KernelMemory; 840 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 841 IsPowerPC64 || IsHexagon || IsLoongArch64 || IsRISCV64) 842 Res |= SanitizerKind::Scudo; 843 if (IsX86_64 || IsAArch64 || IsRISCV64) { 844 Res |= SanitizerKind::HWAddress; 845 } 846 if (IsX86_64 || IsAArch64) { 847 Res |= SanitizerKind::KernelHWAddress; 848 } 849 if (IsX86_64) 850 Res |= SanitizerKind::NumericalStability; 851 if (!IsAndroid) 852 Res |= SanitizerKind::Memory; 853 854 // Work around "Cannot represent a difference across sections". 855 if (getTriple().getArch() == llvm::Triple::ppc64) 856 Res &= ~SanitizerKind::Function; 857 return Res; 858 } 859 860 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 861 llvm::opt::ArgStringList &CmdArgs) const { 862 // Add linker option -u__llvm_profile_runtime to cause runtime 863 // initialization module to be linked in. 864 if (needsProfileRT(Args)) 865 CmdArgs.push_back(Args.MakeArgString( 866 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 867 ToolChain::addProfileRTLibs(Args, CmdArgs); 868 } 869 870 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 871 for (const auto &Opt : ExtraOpts) 872 CmdArgs.push_back(Opt.c_str()); 873 } 874 875 const char *Linux::getDefaultLinker() const { 876 if (getTriple().isAndroid()) 877 return "ld.lld"; 878 return Generic_ELF::getDefaultLinker(); 879 } 880