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