1 //===--- Linux.h - Linux ToolChain Implementations --------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "Linux.h" 10 #include "Arch/ARM.h" 11 #include "Arch/Mips.h" 12 #include "Arch/PPC.h" 13 #include "Arch/RISCV.h" 14 #include "CommonArgs.h" 15 #include "clang/Config/config.h" 16 #include "clang/Driver/Distro.h" 17 #include "clang/Driver/Driver.h" 18 #include "clang/Driver/Options.h" 19 #include "clang/Driver/SanitizerArgs.h" 20 #include "llvm/Option/ArgList.h" 21 #include "llvm/ProfileData/InstrProf.h" 22 #include "llvm/Support/Path.h" 23 #include "llvm/Support/ScopedPrinter.h" 24 #include "llvm/Support/VirtualFileSystem.h" 25 #include <system_error> 26 27 using namespace clang::driver; 28 using namespace clang::driver::toolchains; 29 using namespace clang; 30 using namespace llvm::opt; 31 32 using tools::addPathIfExists; 33 34 /// Get our best guess at the multiarch triple for a target. 35 /// 36 /// Debian-based systems are starting to use a multiarch setup where they use 37 /// a target-triple directory in the library and header search paths. 38 /// Unfortunately, this triple does not align with the vanilla target triple, 39 /// so we provide a rough mapping here. 40 std::string Linux::getMultiarchTriple(const Driver &D, 41 const llvm::Triple &TargetTriple, 42 StringRef SysRoot) const { 43 llvm::Triple::EnvironmentType TargetEnvironment = 44 TargetTriple.getEnvironment(); 45 bool IsAndroid = TargetTriple.isAndroid(); 46 bool IsMipsR6 = TargetTriple.getSubArch() == llvm::Triple::MipsSubArch_r6; 47 bool IsMipsN32Abi = TargetTriple.getEnvironment() == llvm::Triple::GNUABIN32; 48 49 // For most architectures, just use whatever we have rather than trying to be 50 // clever. 51 switch (TargetTriple.getArch()) { 52 default: 53 break; 54 55 // We use the existence of '/lib/<triple>' as a directory to detect some 56 // common linux triples that don't quite match the Clang triple for both 57 // 32-bit and 64-bit targets. Multiarch fixes its install triples to these 58 // regardless of what the actual target triple is. 59 case llvm::Triple::arm: 60 case llvm::Triple::thumb: 61 if (IsAndroid) 62 return "arm-linux-androideabi"; 63 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 64 return "arm-linux-gnueabihf"; 65 return "arm-linux-gnueabi"; 66 case llvm::Triple::armeb: 67 case llvm::Triple::thumbeb: 68 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 69 return "armeb-linux-gnueabihf"; 70 return "armeb-linux-gnueabi"; 71 case llvm::Triple::x86: 72 if (IsAndroid) 73 return "i686-linux-android"; 74 return "i386-linux-gnu"; 75 case llvm::Triple::x86_64: 76 if (IsAndroid) 77 return "x86_64-linux-android"; 78 if (TargetEnvironment == llvm::Triple::GNUX32) 79 return "x86_64-linux-gnux32"; 80 return "x86_64-linux-gnu"; 81 case llvm::Triple::aarch64: 82 if (IsAndroid) 83 return "aarch64-linux-android"; 84 return "aarch64-linux-gnu"; 85 case llvm::Triple::aarch64_be: 86 return "aarch64_be-linux-gnu"; 87 88 case llvm::Triple::m68k: 89 return "m68k-linux-gnu"; 90 91 case llvm::Triple::mips: 92 return IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu"; 93 case llvm::Triple::mipsel: 94 if (IsAndroid) 95 return "mipsel-linux-android"; 96 return IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu"; 97 case llvm::Triple::mips64: { 98 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") + 99 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 100 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 101 return MT; 102 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64-linux-gnu"))) 103 return "mips64-linux-gnu"; 104 break; 105 } 106 case llvm::Triple::mips64el: { 107 if (IsAndroid) 108 return "mips64el-linux-android"; 109 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") + 110 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 111 if (D.getVFS().exists(concat(SysRoot, "/lib", MT))) 112 return MT; 113 if (D.getVFS().exists(concat(SysRoot, "/lib/mips64el-linux-gnu"))) 114 return "mips64el-linux-gnu"; 115 break; 116 } 117 case llvm::Triple::ppc: 118 if (D.getVFS().exists(concat(SysRoot, "/lib/powerpc-linux-gnuspe"))) 119 return "powerpc-linux-gnuspe"; 120 return "powerpc-linux-gnu"; 121 case llvm::Triple::ppcle: 122 return "powerpcle-linux-gnu"; 123 case llvm::Triple::ppc64: 124 return "powerpc64-linux-gnu"; 125 case llvm::Triple::ppc64le: 126 return "powerpc64le-linux-gnu"; 127 case llvm::Triple::sparc: 128 return "sparc-linux-gnu"; 129 case llvm::Triple::sparcv9: 130 return "sparc64-linux-gnu"; 131 case llvm::Triple::systemz: 132 return "s390x-linux-gnu"; 133 } 134 return TargetTriple.str(); 135 } 136 137 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) { 138 if (Triple.isMIPS()) { 139 if (Triple.isAndroid()) { 140 StringRef CPUName; 141 StringRef ABIName; 142 tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 143 if (CPUName == "mips32r6") 144 return "libr6"; 145 if (CPUName == "mips32r2") 146 return "libr2"; 147 } 148 // lib32 directory has a special meaning on MIPS targets. 149 // It contains N32 ABI binaries. Use this folder if produce 150 // code for N32 ABI only. 151 if (tools::mips::hasMipsAbiArg(Args, "n32")) 152 return "lib32"; 153 return Triple.isArch32Bit() ? "lib" : "lib64"; 154 } 155 156 // It happens that only x86, PPC and SPARC use the 'lib32' variant of 157 // oslibdir, and using that variant while targeting other architectures causes 158 // problems because the libraries are laid out in shared system roots that 159 // can't cope with a 'lib32' library search path being considered. So we only 160 // enable them when we know we may need it. 161 // 162 // FIXME: This is a bit of a hack. We should really unify this code for 163 // reasoning about oslibdir spellings with the lib dir spellings in the 164 // GCCInstallationDetector, but that is a more significant refactoring. 165 if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() || 166 Triple.getArch() == llvm::Triple::sparc) 167 return "lib32"; 168 169 if (Triple.getArch() == llvm::Triple::x86_64 && Triple.isX32()) 170 return "libx32"; 171 172 if (Triple.getArch() == llvm::Triple::riscv32) 173 return "lib32"; 174 175 return Triple.isArch32Bit() ? "lib" : "lib64"; 176 } 177 178 Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 179 : Generic_ELF(D, Triple, Args) { 180 GCCInstallation.init(Triple, Args); 181 Multilibs = GCCInstallation.getMultilibs(); 182 SelectedMultilib = GCCInstallation.getMultilib(); 183 llvm::Triple::ArchType Arch = Triple.getArch(); 184 std::string SysRoot = computeSysRoot(); 185 ToolChain::path_list &PPaths = getProgramPaths(); 186 187 Generic_GCC::PushPPaths(PPaths); 188 189 Distro Distro(D.getVFS(), Triple); 190 191 if (Distro.IsAlpineLinux() || Triple.isAndroid()) { 192 ExtraOpts.push_back("-z"); 193 ExtraOpts.push_back("now"); 194 } 195 196 if (Distro.IsOpenSUSE() || Distro.IsUbuntu() || Distro.IsAlpineLinux() || 197 Triple.isAndroid()) { 198 ExtraOpts.push_back("-z"); 199 ExtraOpts.push_back("relro"); 200 } 201 202 // Android ARM/AArch64 use max-page-size=4096 to reduce VMA usage. Note, lld 203 // from 11 onwards default max-page-size to 65536 for both ARM and AArch64. 204 if ((Triple.isARM() || Triple.isAArch64()) && Triple.isAndroid()) { 205 ExtraOpts.push_back("-z"); 206 ExtraOpts.push_back("max-page-size=4096"); 207 } 208 209 if (GCCInstallation.getParentLibPath().contains("opt/rh/")) 210 // With devtoolset on RHEL, we want to add a bin directory that is relative 211 // to the detected gcc install, because if we are using devtoolset gcc then 212 // we want to use other tools from devtoolset (e.g. ld) instead of the 213 // standard system tools. 214 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 215 "/../bin").str()); 216 217 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 218 ExtraOpts.push_back("-X"); 219 220 const bool IsAndroid = Triple.isAndroid(); 221 const bool IsMips = Triple.isMIPS(); 222 const bool IsHexagon = Arch == llvm::Triple::hexagon; 223 const bool IsRISCV = Triple.isRISCV(); 224 const bool IsCSKY = Triple.isCSKY(); 225 226 if (IsCSKY) 227 SysRoot = SysRoot + SelectedMultilib.osSuffix(); 228 229 if ((IsMips || IsCSKY) && !SysRoot.empty()) 230 ExtraOpts.push_back("--sysroot=" + SysRoot); 231 232 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 233 // and the MIPS ABI require .dynsym to be sorted in different ways. 234 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 235 // ABI requires a mapping between the GOT and the symbol table. 236 // Android loader does not support .gnu.hash until API 23. 237 // Hexagon linker/loader does not support .gnu.hash 238 if (!IsMips && !IsHexagon) { 239 if (Distro.IsRedhat() || Distro.IsOpenSUSE() || Distro.IsAlpineLinux() || 240 (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick) || 241 (IsAndroid && !Triple.isAndroidVersionLT(23))) 242 ExtraOpts.push_back("--hash-style=gnu"); 243 244 if (Distro.IsDebian() || Distro.IsOpenSUSE() || 245 Distro == Distro::UbuntuLucid || Distro == Distro::UbuntuJaunty || 246 Distro == Distro::UbuntuKarmic || 247 (IsAndroid && Triple.isAndroidVersionLT(23))) 248 ExtraOpts.push_back("--hash-style=both"); 249 } 250 251 #ifdef ENABLE_LINKER_BUILD_ID 252 ExtraOpts.push_back("--build-id"); 253 #endif 254 255 if (IsAndroid || Distro.IsOpenSUSE()) 256 ExtraOpts.push_back("--enable-new-dtags"); 257 258 // The selection of paths to try here is designed to match the patterns which 259 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 260 // This was determined by running GCC in a fake filesystem, creating all 261 // possible permutations of these directories, and seeing which ones it added 262 // to the link paths. 263 path_list &Paths = getFilePaths(); 264 265 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 266 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 267 268 // mips32: Debian multilib, we use /libo32, while in other case, /lib is 269 // used. We need add both libo32 and /lib. 270 if (Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel) { 271 Generic_GCC::AddMultilibPaths(D, SysRoot, "libo32", MultiarchTriple, Paths); 272 addPathIfExists(D, concat(SysRoot, "/libo32"), Paths); 273 addPathIfExists(D, concat(SysRoot, "/usr/libo32"), Paths); 274 } 275 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 276 277 addPathIfExists(D, concat(SysRoot, "/lib", MultiarchTriple), Paths); 278 addPathIfExists(D, concat(SysRoot, "/lib/..", OSLibDir), Paths); 279 280 if (IsAndroid) { 281 // Android sysroots contain a library directory for each supported OS 282 // version as well as some unversioned libraries in the usual multiarch 283 // directory. 284 addPathIfExists( 285 D, 286 concat(SysRoot, "/usr/lib", MultiarchTriple, 287 llvm::to_string(Triple.getEnvironmentVersion().getMajor())), 288 Paths); 289 } 290 291 addPathIfExists(D, concat(SysRoot, "/usr/lib", MultiarchTriple), Paths); 292 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 293 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 294 // this here. 295 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 296 Triple.isArch64Bit()) 297 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir), Paths); 298 else 299 addPathIfExists(D, concat(SysRoot, "/usr/lib/..", OSLibDir), Paths); 300 if (IsRISCV) { 301 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 302 addPathIfExists(D, concat(SysRoot, "/", OSLibDir, ABIName), Paths); 303 addPathIfExists(D, concat(SysRoot, "/usr", OSLibDir, ABIName), Paths); 304 } 305 306 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 307 308 // The deprecated -DLLVM_ENABLE_PROJECTS=libcxx configuration installs 309 // libc++.so in D.Dir+"/../lib/". Detect this path. 310 // TODO Remove once LLVM_ENABLE_PROJECTS=libcxx is unsupported. 311 if (StringRef(D.Dir).startswith(SysRoot) && 312 D.getVFS().exists(D.Dir + "/../lib/libc++.so")) 313 addPathIfExists(D, D.Dir + "/../lib", Paths); 314 315 addPathIfExists(D, concat(SysRoot, "/lib"), Paths); 316 addPathIfExists(D, concat(SysRoot, "/usr/lib"), Paths); 317 } 318 319 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 320 if (getTriple().isAndroid()) 321 return ToolChain::RLT_CompilerRT; 322 return Generic_ELF::GetDefaultRuntimeLibType(); 323 } 324 325 unsigned Linux::GetDefaultDwarfVersion() const { 326 if (getTriple().isAndroid()) 327 return 4; 328 return ToolChain::GetDefaultDwarfVersion(); 329 } 330 331 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 332 if (getTriple().isAndroid()) 333 return ToolChain::CST_Libcxx; 334 return ToolChain::CST_Libstdcxx; 335 } 336 337 bool Linux::HasNativeLLVMSupport() const { return true; } 338 339 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 340 341 Tool *Linux::buildStaticLibTool() const { 342 return new tools::gnutools::StaticLibTool(*this); 343 } 344 345 Tool *Linux::buildAssembler() const { 346 return new tools::gnutools::Assembler(*this); 347 } 348 349 std::string Linux::computeSysRoot() const { 350 if (!getDriver().SysRoot.empty()) 351 return getDriver().SysRoot; 352 353 if (getTriple().isAndroid()) { 354 // Android toolchains typically include a sysroot at ../sysroot relative to 355 // the clang binary. 356 const StringRef ClangDir = getDriver().getInstalledDir(); 357 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 358 if (getVFS().exists(AndroidSysRootPath)) 359 return AndroidSysRootPath; 360 } 361 362 if (getTriple().isCSKY()) { 363 // CSKY toolchains use different names for sysroot folder. 364 if (!GCCInstallation.isValid()) 365 return std::string(); 366 // GCCInstallation.getInstallPath() = 367 // $GCCToolchainPath/lib/gcc/csky-linux-gnuabiv2/6.3.0 368 // Path = $GCCToolchainPath/csky-linux-gnuabiv2/libc 369 std::string Path = (GCCInstallation.getInstallPath() + "/../../../../" + 370 GCCInstallation.getTriple().str() + "/libc") 371 .str(); 372 if (getVFS().exists(Path)) 373 return Path; 374 return std::string(); 375 } 376 377 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 378 return std::string(); 379 380 // Standalone MIPS toolchains use different names for sysroot folder 381 // and put it into different places. Here we try to check some known 382 // variants. 383 384 const StringRef InstallDir = GCCInstallation.getInstallPath(); 385 const StringRef TripleStr = GCCInstallation.getTriple().str(); 386 const Multilib &Multilib = GCCInstallation.getMultilib(); 387 388 std::string Path = 389 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 390 .str(); 391 392 if (getVFS().exists(Path)) 393 return Path; 394 395 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 396 397 if (getVFS().exists(Path)) 398 return Path; 399 400 return std::string(); 401 } 402 403 std::string Linux::getDynamicLinker(const ArgList &Args) const { 404 const llvm::Triple::ArchType Arch = getArch(); 405 const llvm::Triple &Triple = getTriple(); 406 407 const Distro Distro(getDriver().getVFS(), Triple); 408 409 if (Triple.isAndroid()) 410 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 411 412 if (Triple.isMusl()) { 413 std::string ArchName; 414 bool IsArm = false; 415 416 switch (Arch) { 417 case llvm::Triple::arm: 418 case llvm::Triple::thumb: 419 ArchName = "arm"; 420 IsArm = true; 421 break; 422 case llvm::Triple::armeb: 423 case llvm::Triple::thumbeb: 424 ArchName = "armeb"; 425 IsArm = true; 426 break; 427 case llvm::Triple::x86: 428 ArchName = "i386"; 429 break; 430 case llvm::Triple::x86_64: 431 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 432 break; 433 default: 434 ArchName = Triple.getArchName().str(); 435 } 436 if (IsArm && 437 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 438 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 439 ArchName += "hf"; 440 if (Arch == llvm::Triple::ppc && 441 Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 442 ArchName = "powerpc-sf"; 443 444 return "/lib/ld-musl-" + ArchName + ".so.1"; 445 } 446 447 std::string LibDir; 448 std::string Loader; 449 450 switch (Arch) { 451 default: 452 llvm_unreachable("unsupported architecture"); 453 454 case llvm::Triple::aarch64: 455 LibDir = "lib"; 456 Loader = "ld-linux-aarch64.so.1"; 457 break; 458 case llvm::Triple::aarch64_be: 459 LibDir = "lib"; 460 Loader = "ld-linux-aarch64_be.so.1"; 461 break; 462 case llvm::Triple::arm: 463 case llvm::Triple::thumb: 464 case llvm::Triple::armeb: 465 case llvm::Triple::thumbeb: { 466 const bool HF = 467 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 468 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 469 470 LibDir = "lib"; 471 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 472 break; 473 } 474 case llvm::Triple::m68k: 475 LibDir = "lib"; 476 Loader = "ld.so.1"; 477 break; 478 case llvm::Triple::mips: 479 case llvm::Triple::mipsel: 480 case llvm::Triple::mips64: 481 case llvm::Triple::mips64el: { 482 bool IsNaN2008 = tools::mips::isNaN2008(getDriver(), Args, Triple); 483 484 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 485 486 if (tools::mips::isUCLibc(Args)) 487 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 488 else if (!Triple.hasEnvironment() && 489 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 490 Loader = 491 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 492 else 493 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 494 495 break; 496 } 497 case llvm::Triple::ppc: 498 LibDir = "lib"; 499 Loader = "ld.so.1"; 500 break; 501 case llvm::Triple::ppcle: 502 LibDir = "lib"; 503 Loader = "ld.so.1"; 504 break; 505 case llvm::Triple::ppc64: 506 LibDir = "lib64"; 507 Loader = 508 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 509 break; 510 case llvm::Triple::ppc64le: 511 LibDir = "lib64"; 512 Loader = 513 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 514 break; 515 case llvm::Triple::riscv32: { 516 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 517 LibDir = "lib"; 518 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 519 break; 520 } 521 case llvm::Triple::riscv64: { 522 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 523 LibDir = "lib"; 524 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 525 break; 526 } 527 case llvm::Triple::sparc: 528 case llvm::Triple::sparcel: 529 LibDir = "lib"; 530 Loader = "ld-linux.so.2"; 531 break; 532 case llvm::Triple::sparcv9: 533 LibDir = "lib64"; 534 Loader = "ld-linux.so.2"; 535 break; 536 case llvm::Triple::systemz: 537 LibDir = "lib"; 538 Loader = "ld64.so.1"; 539 break; 540 case llvm::Triple::x86: 541 LibDir = "lib"; 542 Loader = "ld-linux.so.2"; 543 break; 544 case llvm::Triple::x86_64: { 545 bool X32 = Triple.isX32(); 546 547 LibDir = X32 ? "libx32" : "lib64"; 548 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 549 break; 550 } 551 case llvm::Triple::ve: 552 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 553 case llvm::Triple::csky: { 554 LibDir = "lib"; 555 Loader = "ld.so.1"; 556 break; 557 } 558 } 559 560 if (Distro == Distro::Exherbo && 561 (Triple.getVendor() == llvm::Triple::UnknownVendor || 562 Triple.getVendor() == llvm::Triple::PC)) 563 return "/usr/" + Triple.str() + "/lib/" + Loader; 564 return "/" + LibDir + "/" + Loader; 565 } 566 567 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 568 ArgStringList &CC1Args) const { 569 const Driver &D = getDriver(); 570 std::string SysRoot = computeSysRoot(); 571 572 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 573 return; 574 575 // Add 'include' in the resource directory, which is similar to 576 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 577 // contains some files conflicting with system /usr/include. musl systems 578 // prefer the /usr/include copies which are more relevant. 579 SmallString<128> ResourceDirInclude(D.ResourceDir); 580 llvm::sys::path::append(ResourceDirInclude, "include"); 581 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 582 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 583 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 584 585 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 586 return; 587 588 // LOCAL_INCLUDE_DIR 589 addSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/local/include")); 590 // TOOL_INCLUDE_DIR 591 AddMultilibIncludeArgs(DriverArgs, CC1Args); 592 593 // Check for configure-time C include directories. 594 StringRef CIncludeDirs(C_INCLUDE_DIRS); 595 if (CIncludeDirs != "") { 596 SmallVector<StringRef, 5> dirs; 597 CIncludeDirs.split(dirs, ":"); 598 for (StringRef dir : dirs) { 599 StringRef Prefix = 600 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 601 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 602 } 603 return; 604 } 605 606 // On systems using multiarch and Android, add /usr/include/$triple before 607 // /usr/include. 608 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 609 if (!MultiarchIncludeDir.empty() && 610 D.getVFS().exists(concat(SysRoot, "/usr/include", MultiarchIncludeDir))) 611 addExternCSystemInclude( 612 DriverArgs, CC1Args, 613 concat(SysRoot, "/usr/include", MultiarchIncludeDir)); 614 615 if (getTriple().getOS() == llvm::Triple::RTEMS) 616 return; 617 618 // Add an include of '/include' directly. This isn't provided by default by 619 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 620 // add even when Clang is acting as-if it were a system compiler. 621 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/include")); 622 623 addExternCSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/include")); 624 625 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 626 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 627 } 628 629 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 630 llvm::opt::ArgStringList &CC1Args) const { 631 // We need a detected GCC installation on Linux to provide libstdc++'s 632 // headers in odd Linuxish places. 633 if (!GCCInstallation.isValid()) 634 return; 635 636 // Detect Debian g++-multiarch-incdir.diff. 637 StringRef TripleStr = GCCInstallation.getTriple().str(); 638 StringRef DebianMultiarch = 639 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 640 ? "i386-linux-gnu" 641 : TripleStr; 642 643 // Try generic GCC detection first. 644 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 645 DebianMultiarch)) 646 return; 647 648 StringRef LibDir = GCCInstallation.getParentLibPath(); 649 const Multilib &Multilib = GCCInstallation.getMultilib(); 650 const GCCVersion &Version = GCCInstallation.getVersion(); 651 652 const std::string LibStdCXXIncludePathCandidates[] = { 653 // Android standalone toolchain has C++ headers in yet another place. 654 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 655 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 656 // without a subdirectory corresponding to the gcc version. 657 LibDir.str() + "/../include/c++", 658 // Cray's gcc installation puts headers under "g++" without a 659 // version suffix. 660 LibDir.str() + "/../include/g++", 661 }; 662 663 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 664 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 665 Multilib.includeSuffix(), DriverArgs, CC1Args)) 666 break; 667 } 668 } 669 670 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 671 ArgStringList &CC1Args) const { 672 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args); 673 } 674 675 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 676 ArgStringList &CC1Args) const { 677 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args); 678 } 679 680 void Linux::AddHIPRuntimeLibArgs(const ArgList &Args, 681 ArgStringList &CmdArgs) const { 682 CmdArgs.append( 683 {Args.MakeArgString(StringRef("-L") + RocmInstallation.getLibPath()), 684 "-rpath", Args.MakeArgString(RocmInstallation.getLibPath())}); 685 686 CmdArgs.push_back("-lamdhip64"); 687 } 688 689 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 690 ArgStringList &CC1Args) const { 691 if (GCCInstallation.isValid()) { 692 CC1Args.push_back("-isystem"); 693 CC1Args.push_back(DriverArgs.MakeArgString( 694 GCCInstallation.getParentLibPath() + "/../" + 695 GCCInstallation.getTriple().str() + "/include")); 696 } 697 } 698 699 bool Linux::isPIEDefault(const llvm::opt::ArgList &Args) const { 700 return CLANG_DEFAULT_PIE_ON_LINUX || getTriple().isAndroid() || 701 getTriple().isMusl() || getSanitizerArgs(Args).requiresPIE(); 702 } 703 704 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 705 // Outline atomics for AArch64 are supported by compiler-rt 706 // and libgcc since 9.3.1 707 assert(getTriple().isAArch64() && "expected AArch64 target!"); 708 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 709 if (RtLib == ToolChain::RLT_CompilerRT) 710 return true; 711 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 712 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 713 return false; 714 return true; 715 } 716 717 bool Linux::IsMathErrnoDefault() const { 718 if (getTriple().isAndroid() || getTriple().isMusl()) 719 return false; 720 return Generic_ELF::IsMathErrnoDefault(); 721 } 722 723 SanitizerMask Linux::getSupportedSanitizers() const { 724 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 725 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 726 const bool IsMIPS = getTriple().isMIPS32(); 727 const bool IsMIPS64 = getTriple().isMIPS64(); 728 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 729 getTriple().getArch() == llvm::Triple::ppc64le; 730 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 731 getTriple().getArch() == llvm::Triple::aarch64_be; 732 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 733 getTriple().getArch() == llvm::Triple::thumb || 734 getTriple().getArch() == llvm::Triple::armeb || 735 getTriple().getArch() == llvm::Triple::thumbeb; 736 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 737 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 738 const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon; 739 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 740 Res |= SanitizerKind::Address; 741 Res |= SanitizerKind::PointerCompare; 742 Res |= SanitizerKind::PointerSubtract; 743 Res |= SanitizerKind::Fuzzer; 744 Res |= SanitizerKind::FuzzerNoLink; 745 Res |= SanitizerKind::KernelAddress; 746 Res |= SanitizerKind::Memory; 747 Res |= SanitizerKind::Vptr; 748 Res |= SanitizerKind::SafeStack; 749 if (IsX86_64 || IsMIPS64 || IsAArch64) 750 Res |= SanitizerKind::DataFlow; 751 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 752 IsRISCV64 || IsSystemZ || IsHexagon) 753 Res |= SanitizerKind::Leak; 754 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ) 755 Res |= SanitizerKind::Thread; 756 if (IsX86_64) 757 Res |= SanitizerKind::KernelMemory; 758 if (IsX86 || IsX86_64) 759 Res |= SanitizerKind::Function; 760 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 761 IsPowerPC64 || IsHexagon) 762 Res |= SanitizerKind::Scudo; 763 if (IsX86_64 || IsAArch64) { 764 Res |= SanitizerKind::HWAddress; 765 Res |= SanitizerKind::KernelHWAddress; 766 } 767 return Res; 768 } 769 770 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 771 llvm::opt::ArgStringList &CmdArgs) const { 772 // Add linker option -u__llvm_profile_runtime to cause runtime 773 // initialization module to be linked in. 774 if (needsProfileRT(Args)) 775 CmdArgs.push_back(Args.MakeArgString( 776 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 777 ToolChain::addProfileRTLibs(Args, CmdArgs); 778 } 779 780 llvm::DenormalMode 781 Linux::getDefaultDenormalModeForType(const llvm::opt::ArgList &DriverArgs, 782 const JobAction &JA, 783 const llvm::fltSemantics *FPType) const { 784 switch (getTriple().getArch()) { 785 case llvm::Triple::x86: 786 case llvm::Triple::x86_64: { 787 std::string Unused; 788 // DAZ and FTZ are turned on in crtfastmath.o 789 if (!DriverArgs.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) && 790 isFastMathRuntimeAvailable(DriverArgs, Unused)) 791 return llvm::DenormalMode::getPreserveSign(); 792 return llvm::DenormalMode::getIEEE(); 793 } 794 default: 795 return llvm::DenormalMode::getIEEE(); 796 } 797 } 798 799 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 800 for (const auto &Opt : ExtraOpts) 801 CmdArgs.push_back(Opt.c_str()); 802 } 803