1 //===--- Linux.h - Linux ToolChain Implementations --------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "Linux.h" 10 #include "Arch/ARM.h" 11 #include "Arch/Mips.h" 12 #include "Arch/PPC.h" 13 #include "Arch/RISCV.h" 14 #include "CommonArgs.h" 15 #include "clang/Config/config.h" 16 #include "clang/Driver/Distro.h" 17 #include "clang/Driver/Driver.h" 18 #include "clang/Driver/Options.h" 19 #include "clang/Driver/SanitizerArgs.h" 20 #include "llvm/Option/ArgList.h" 21 #include "llvm/ProfileData/InstrProf.h" 22 #include "llvm/Support/Path.h" 23 #include "llvm/Support/ScopedPrinter.h" 24 #include "llvm/Support/VirtualFileSystem.h" 25 #include <system_error> 26 27 using namespace clang::driver; 28 using namespace clang::driver::toolchains; 29 using namespace clang; 30 using namespace llvm::opt; 31 32 using tools::addPathIfExists; 33 34 /// Get our best guess at the multiarch triple for a target. 35 /// 36 /// Debian-based systems are starting to use a multiarch setup where they use 37 /// a target-triple directory in the library and header search paths. 38 /// Unfortunately, this triple does not align with the vanilla target triple, 39 /// so we provide a rough mapping here. 40 std::string Linux::getMultiarchTriple(const Driver &D, 41 const llvm::Triple &TargetTriple, 42 StringRef SysRoot) const { 43 llvm::Triple::EnvironmentType TargetEnvironment = 44 TargetTriple.getEnvironment(); 45 bool IsAndroid = TargetTriple.isAndroid(); 46 bool IsMipsR6 = TargetTriple.getSubArch() == llvm::Triple::MipsSubArch_r6; 47 bool IsMipsN32Abi = TargetTriple.getEnvironment() == llvm::Triple::GNUABIN32; 48 49 // For most architectures, just use whatever we have rather than trying to be 50 // clever. 51 switch (TargetTriple.getArch()) { 52 default: 53 break; 54 55 // We use the existence of '/lib/<triple>' as a directory to detect some 56 // common linux triples that don't quite match the Clang triple for both 57 // 32-bit and 64-bit targets. Multiarch fixes its install triples to these 58 // regardless of what the actual target triple is. 59 case llvm::Triple::arm: 60 case llvm::Triple::thumb: 61 if (IsAndroid) 62 return "arm-linux-androideabi"; 63 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 64 return "arm-linux-gnueabihf"; 65 return "arm-linux-gnueabi"; 66 case llvm::Triple::armeb: 67 case llvm::Triple::thumbeb: 68 if (TargetEnvironment == llvm::Triple::GNUEABIHF) 69 return "armeb-linux-gnueabihf"; 70 return "armeb-linux-gnueabi"; 71 case llvm::Triple::x86: 72 if (IsAndroid) 73 return "i686-linux-android"; 74 return "i386-linux-gnu"; 75 case llvm::Triple::x86_64: 76 if (IsAndroid) 77 return "x86_64-linux-android"; 78 if (TargetEnvironment == llvm::Triple::GNUX32) 79 return "x86_64-linux-gnux32"; 80 return "x86_64-linux-gnu"; 81 case llvm::Triple::aarch64: 82 if (IsAndroid) 83 return "aarch64-linux-android"; 84 return "aarch64-linux-gnu"; 85 case llvm::Triple::aarch64_be: 86 return "aarch64_be-linux-gnu"; 87 88 case llvm::Triple::m68k: 89 return "m68k-linux-gnu"; 90 91 case llvm::Triple::mips: 92 return IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu"; 93 case llvm::Triple::mipsel: 94 if (IsAndroid) 95 return "mipsel-linux-android"; 96 return IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu"; 97 case llvm::Triple::mips64: { 98 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") + 99 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 100 if (D.getVFS().exists(SysRoot + "/lib/" + MT)) 101 return MT; 102 if (D.getVFS().exists(SysRoot + "/lib/mips64-linux-gnu")) 103 return "mips64-linux-gnu"; 104 break; 105 } 106 case llvm::Triple::mips64el: { 107 if (IsAndroid) 108 return "mips64el-linux-android"; 109 std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") + 110 "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64"); 111 if (D.getVFS().exists(SysRoot + "/lib/" + MT)) 112 return MT; 113 if (D.getVFS().exists(SysRoot + "/lib/mips64el-linux-gnu")) 114 return "mips64el-linux-gnu"; 115 break; 116 } 117 case llvm::Triple::ppc: 118 if (D.getVFS().exists(SysRoot + "/lib/powerpc-linux-gnuspe")) 119 return "powerpc-linux-gnuspe"; 120 return "powerpc-linux-gnu"; 121 case llvm::Triple::ppcle: 122 return "powerpcle-linux-gnu"; 123 case llvm::Triple::ppc64: 124 return "powerpc64-linux-gnu"; 125 case llvm::Triple::ppc64le: 126 return "powerpc64le-linux-gnu"; 127 case llvm::Triple::sparc: 128 return "sparc-linux-gnu"; 129 case llvm::Triple::sparcv9: 130 return "sparc64-linux-gnu"; 131 case llvm::Triple::systemz: 132 return "s390x-linux-gnu"; 133 } 134 return TargetTriple.str(); 135 } 136 137 static StringRef getOSLibDir(const llvm::Triple &Triple, const ArgList &Args) { 138 if (Triple.isMIPS()) { 139 if (Triple.isAndroid()) { 140 StringRef CPUName; 141 StringRef ABIName; 142 tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 143 if (CPUName == "mips32r6") 144 return "libr6"; 145 if (CPUName == "mips32r2") 146 return "libr2"; 147 } 148 // lib32 directory has a special meaning on MIPS targets. 149 // It contains N32 ABI binaries. Use this folder if produce 150 // code for N32 ABI only. 151 if (tools::mips::hasMipsAbiArg(Args, "n32")) 152 return "lib32"; 153 return Triple.isArch32Bit() ? "lib" : "lib64"; 154 } 155 156 // It happens that only x86, PPC and SPARC use the 'lib32' variant of 157 // oslibdir, and using that variant while targeting other architectures causes 158 // problems because the libraries are laid out in shared system roots that 159 // can't cope with a 'lib32' library search path being considered. So we only 160 // enable them when we know we may need it. 161 // 162 // FIXME: This is a bit of a hack. We should really unify this code for 163 // reasoning about oslibdir spellings with the lib dir spellings in the 164 // GCCInstallationDetector, but that is a more significant refactoring. 165 if (Triple.getArch() == llvm::Triple::x86 || Triple.isPPC32() || 166 Triple.getArch() == llvm::Triple::sparc) 167 return "lib32"; 168 169 if (Triple.getArch() == llvm::Triple::x86_64 && 170 Triple.getEnvironment() == llvm::Triple::GNUX32) 171 return "libx32"; 172 173 if (Triple.getArch() == llvm::Triple::riscv32) 174 return "lib32"; 175 176 return Triple.isArch32Bit() ? "lib" : "lib64"; 177 } 178 179 Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args) 180 : Generic_ELF(D, Triple, Args) { 181 GCCInstallation.init(Triple, Args); 182 Multilibs = GCCInstallation.getMultilibs(); 183 SelectedMultilib = GCCInstallation.getMultilib(); 184 llvm::Triple::ArchType Arch = Triple.getArch(); 185 std::string SysRoot = computeSysRoot(); 186 ToolChain::path_list &PPaths = getProgramPaths(); 187 188 Generic_GCC::PushPPaths(PPaths); 189 190 Distro Distro(D.getVFS(), Triple); 191 192 if (Distro.IsAlpineLinux() || Triple.isAndroid()) { 193 ExtraOpts.push_back("-z"); 194 ExtraOpts.push_back("now"); 195 } 196 197 if (Distro.IsOpenSUSE() || Distro.IsUbuntu() || Distro.IsAlpineLinux() || 198 Triple.isAndroid()) { 199 ExtraOpts.push_back("-z"); 200 ExtraOpts.push_back("relro"); 201 } 202 203 // Android ARM/AArch64 use max-page-size=4096 to reduce VMA usage. Note, lld 204 // from 11 onwards default max-page-size to 65536 for both ARM and AArch64. 205 if ((Triple.isARM() || Triple.isAArch64()) && Triple.isAndroid()) { 206 ExtraOpts.push_back("-z"); 207 ExtraOpts.push_back("max-page-size=4096"); 208 } 209 210 if (GCCInstallation.getParentLibPath().find("opt/rh/devtoolset") != 211 StringRef::npos) 212 // With devtoolset on RHEL, we want to add a bin directory that is relative 213 // to the detected gcc install, because if we are using devtoolset gcc then 214 // we want to use other tools from devtoolset (e.g. ld) instead of the 215 // standard system tools. 216 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 217 "/../bin").str()); 218 219 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 220 ExtraOpts.push_back("-X"); 221 222 const bool IsAndroid = Triple.isAndroid(); 223 const bool IsMips = Triple.isMIPS(); 224 const bool IsHexagon = Arch == llvm::Triple::hexagon; 225 const bool IsRISCV = Triple.isRISCV(); 226 227 if (IsMips && !SysRoot.empty()) 228 ExtraOpts.push_back("--sysroot=" + SysRoot); 229 230 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 231 // and the MIPS ABI require .dynsym to be sorted in different ways. 232 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 233 // ABI requires a mapping between the GOT and the symbol table. 234 // Android loader does not support .gnu.hash until API 23. 235 // Hexagon linker/loader does not support .gnu.hash 236 if (!IsMips && !IsHexagon) { 237 if (Distro.IsRedhat() || Distro.IsOpenSUSE() || Distro.IsAlpineLinux() || 238 (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick) || 239 (IsAndroid && !Triple.isAndroidVersionLT(23))) 240 ExtraOpts.push_back("--hash-style=gnu"); 241 242 if (Distro.IsDebian() || Distro.IsOpenSUSE() || 243 Distro == Distro::UbuntuLucid || Distro == Distro::UbuntuJaunty || 244 Distro == Distro::UbuntuKarmic || 245 (IsAndroid && Triple.isAndroidVersionLT(23))) 246 ExtraOpts.push_back("--hash-style=both"); 247 } 248 249 #ifdef ENABLE_LINKER_BUILD_ID 250 ExtraOpts.push_back("--build-id"); 251 #endif 252 253 if (IsAndroid || Distro.IsOpenSUSE()) 254 ExtraOpts.push_back("--enable-new-dtags"); 255 256 addPathIfExists(D, getRuntimePath(), getLibraryPaths()); 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 addPathIfExists(D, getStdlibPath(), Paths); 266 267 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 268 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 269 270 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 271 272 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 273 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); 274 275 if (IsAndroid) { 276 // Android sysroots contain a library directory for each supported OS 277 // version as well as some unversioned libraries in the usual multiarch 278 // directory. 279 unsigned Major; 280 unsigned Minor; 281 unsigned Micro; 282 Triple.getEnvironmentVersion(Major, Minor, Micro); 283 addPathIfExists(D, 284 SysRoot + "/usr/lib/" + MultiarchTriple + "/" + 285 llvm::to_string(Major), 286 Paths); 287 } 288 289 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 290 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 291 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 292 // this here. 293 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 294 Triple.isArch64Bit()) 295 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir, Paths); 296 else 297 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 298 if (IsRISCV) { 299 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 300 addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); 301 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); 302 } 303 304 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 305 306 // Similar to the logic for GCC above, if we are currently running Clang 307 // inside of the requested system root, add its parent library path to those 308 // searched. 309 // FIXME: It's not clear whether we should use the driver's installed 310 // directory ('Dir' below) or the ResourceDir. 311 if (StringRef(D.Dir).startswith(SysRoot)) 312 addPathIfExists(D, D.Dir + "/../lib", Paths); 313 314 addPathIfExists(D, SysRoot + "/lib", Paths); 315 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 316 } 317 318 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 319 if (getTriple().isAndroid()) 320 return ToolChain::RLT_CompilerRT; 321 return Generic_ELF::GetDefaultRuntimeLibType(); 322 } 323 324 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 325 if (getTriple().isAndroid()) 326 return ToolChain::CST_Libcxx; 327 return ToolChain::CST_Libstdcxx; 328 } 329 330 bool Linux::HasNativeLLVMSupport() const { return true; } 331 332 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 333 334 Tool *Linux::buildStaticLibTool() const { 335 return new tools::gnutools::StaticLibTool(*this); 336 } 337 338 Tool *Linux::buildAssembler() const { 339 return new tools::gnutools::Assembler(*this); 340 } 341 342 std::string Linux::computeSysRoot() const { 343 if (!getDriver().SysRoot.empty()) 344 return getDriver().SysRoot; 345 346 if (getTriple().isAndroid()) { 347 // Android toolchains typically include a sysroot at ../sysroot relative to 348 // the clang binary. 349 const StringRef ClangDir = getDriver().getInstalledDir(); 350 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 351 if (getVFS().exists(AndroidSysRootPath)) 352 return AndroidSysRootPath; 353 } 354 355 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 356 return std::string(); 357 358 // Standalone MIPS toolchains use different names for sysroot folder 359 // and put it into different places. Here we try to check some known 360 // variants. 361 362 const StringRef InstallDir = GCCInstallation.getInstallPath(); 363 const StringRef TripleStr = GCCInstallation.getTriple().str(); 364 const Multilib &Multilib = GCCInstallation.getMultilib(); 365 366 std::string Path = 367 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 368 .str(); 369 370 if (getVFS().exists(Path)) 371 return Path; 372 373 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 374 375 if (getVFS().exists(Path)) 376 return Path; 377 378 return std::string(); 379 } 380 381 std::string Linux::getDynamicLinker(const ArgList &Args) const { 382 const llvm::Triple::ArchType Arch = getArch(); 383 const llvm::Triple &Triple = getTriple(); 384 385 const Distro Distro(getDriver().getVFS(), Triple); 386 387 if (Triple.isAndroid()) 388 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 389 390 if (Triple.isMusl()) { 391 std::string ArchName; 392 bool IsArm = false; 393 394 switch (Arch) { 395 case llvm::Triple::arm: 396 case llvm::Triple::thumb: 397 ArchName = "arm"; 398 IsArm = true; 399 break; 400 case llvm::Triple::armeb: 401 case llvm::Triple::thumbeb: 402 ArchName = "armeb"; 403 IsArm = true; 404 break; 405 case llvm::Triple::x86: 406 ArchName = "i386"; 407 break; 408 case llvm::Triple::x86_64: 409 ArchName = Triple.getEnvironment() == llvm::Triple::MuslX32 410 ? "x32" 411 : Triple.getArchName().str(); 412 break; 413 default: 414 ArchName = Triple.getArchName().str(); 415 } 416 if (IsArm && 417 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 418 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 419 ArchName += "hf"; 420 421 return "/lib/ld-musl-" + ArchName + ".so.1"; 422 } 423 424 std::string LibDir; 425 std::string Loader; 426 427 switch (Arch) { 428 default: 429 llvm_unreachable("unsupported architecture"); 430 431 case llvm::Triple::aarch64: 432 LibDir = "lib"; 433 Loader = "ld-linux-aarch64.so.1"; 434 break; 435 case llvm::Triple::aarch64_be: 436 LibDir = "lib"; 437 Loader = "ld-linux-aarch64_be.so.1"; 438 break; 439 case llvm::Triple::arm: 440 case llvm::Triple::thumb: 441 case llvm::Triple::armeb: 442 case llvm::Triple::thumbeb: { 443 const bool HF = 444 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 445 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 446 447 LibDir = "lib"; 448 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 449 break; 450 } 451 case llvm::Triple::m68k: 452 LibDir = "lib"; 453 Loader = "ld.so.1"; 454 break; 455 case llvm::Triple::mips: 456 case llvm::Triple::mipsel: 457 case llvm::Triple::mips64: 458 case llvm::Triple::mips64el: { 459 bool IsNaN2008 = tools::mips::isNaN2008(Args, Triple); 460 461 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 462 463 if (tools::mips::isUCLibc(Args)) 464 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 465 else if (!Triple.hasEnvironment() && 466 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 467 Loader = 468 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 469 else 470 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 471 472 break; 473 } 474 case llvm::Triple::ppc: 475 LibDir = "lib"; 476 Loader = "ld.so.1"; 477 break; 478 case llvm::Triple::ppcle: 479 LibDir = "lib"; 480 Loader = "ld.so.1"; 481 break; 482 case llvm::Triple::ppc64: 483 LibDir = "lib64"; 484 Loader = 485 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 486 break; 487 case llvm::Triple::ppc64le: 488 LibDir = "lib64"; 489 Loader = 490 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 491 break; 492 case llvm::Triple::riscv32: { 493 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 494 LibDir = "lib"; 495 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 496 break; 497 } 498 case llvm::Triple::riscv64: { 499 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 500 LibDir = "lib"; 501 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 502 break; 503 } 504 case llvm::Triple::sparc: 505 case llvm::Triple::sparcel: 506 LibDir = "lib"; 507 Loader = "ld-linux.so.2"; 508 break; 509 case llvm::Triple::sparcv9: 510 LibDir = "lib64"; 511 Loader = "ld-linux.so.2"; 512 break; 513 case llvm::Triple::systemz: 514 LibDir = "lib"; 515 Loader = "ld64.so.1"; 516 break; 517 case llvm::Triple::x86: 518 LibDir = "lib"; 519 Loader = "ld-linux.so.2"; 520 break; 521 case llvm::Triple::x86_64: { 522 bool X32 = Triple.getEnvironment() == llvm::Triple::GNUX32; 523 524 LibDir = X32 ? "libx32" : "lib64"; 525 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 526 break; 527 } 528 case llvm::Triple::ve: 529 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 530 } 531 532 if (Distro == Distro::Exherbo && 533 (Triple.getVendor() == llvm::Triple::UnknownVendor || 534 Triple.getVendor() == llvm::Triple::PC)) 535 return "/usr/" + Triple.str() + "/lib/" + Loader; 536 return "/" + LibDir + "/" + Loader; 537 } 538 539 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 540 ArgStringList &CC1Args) const { 541 const Driver &D = getDriver(); 542 std::string SysRoot = computeSysRoot(); 543 544 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 545 return; 546 547 // Add 'include' in the resource directory, which is similar to 548 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 549 // contains some files conflicting with system /usr/include. musl systems 550 // prefer the /usr/include copies which are more relevant. 551 SmallString<128> ResourceDirInclude(D.ResourceDir); 552 llvm::sys::path::append(ResourceDirInclude, "include"); 553 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 554 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 555 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 556 557 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 558 return; 559 560 // LOCAL_INCLUDE_DIR 561 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 562 // TOOL_INCLUDE_DIR 563 AddMultilibIncludeArgs(DriverArgs, CC1Args); 564 565 // Check for configure-time C include directories. 566 StringRef CIncludeDirs(C_INCLUDE_DIRS); 567 if (CIncludeDirs != "") { 568 SmallVector<StringRef, 5> dirs; 569 CIncludeDirs.split(dirs, ":"); 570 for (StringRef dir : dirs) { 571 StringRef Prefix = 572 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 573 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 574 } 575 return; 576 } 577 578 // On systems using multiarch and Android, add /usr/include/$triple before 579 // /usr/include. 580 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 581 if (!MultiarchIncludeDir.empty() && 582 D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir)) 583 addExternCSystemInclude(DriverArgs, CC1Args, 584 SysRoot + "/usr/include/" + MultiarchIncludeDir); 585 586 if (getTriple().getOS() == llvm::Triple::RTEMS) 587 return; 588 589 // Add an include of '/include' directly. This isn't provided by default by 590 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 591 // add even when Clang is acting as-if it were a system compiler. 592 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 593 594 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 595 596 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 597 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 598 } 599 600 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 601 llvm::opt::ArgStringList &CC1Args) const { 602 // Try generic GCC detection first. 603 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args)) 604 return; 605 606 // We need a detected GCC installation on Linux to provide libstdc++'s 607 // headers in odd Linuxish places. 608 if (!GCCInstallation.isValid()) 609 return; 610 611 StringRef LibDir = GCCInstallation.getParentLibPath(); 612 StringRef TripleStr = GCCInstallation.getTriple().str(); 613 const Multilib &Multilib = GCCInstallation.getMultilib(); 614 const GCCVersion &Version = GCCInstallation.getVersion(); 615 616 const std::string LibStdCXXIncludePathCandidates[] = { 617 // Android standalone toolchain has C++ headers in yet another place. 618 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 619 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 620 // without a subdirectory corresponding to the gcc version. 621 LibDir.str() + "/../include/c++", 622 // Cray's gcc installation puts headers under "g++" without a 623 // version suffix. 624 LibDir.str() + "/../include/g++", 625 }; 626 627 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 628 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 629 Multilib.includeSuffix(), DriverArgs, CC1Args)) 630 break; 631 } 632 } 633 634 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 635 ArgStringList &CC1Args) const { 636 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args); 637 } 638 639 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 640 ArgStringList &CC1Args) const { 641 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args); 642 } 643 644 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 645 ArgStringList &CC1Args) const { 646 if (GCCInstallation.isValid()) { 647 CC1Args.push_back("-isystem"); 648 CC1Args.push_back(DriverArgs.MakeArgString( 649 GCCInstallation.getParentLibPath() + "/../" + 650 GCCInstallation.getTriple().str() + "/include")); 651 } 652 } 653 654 bool Linux::isPIEDefault() const { 655 return (getTriple().isAndroid() && !getTriple().isAndroidVersionLT(16)) || 656 getTriple().isMusl() || getSanitizerArgs().requiresPIE(); 657 } 658 659 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 660 // Outline atomics for AArch64 are supported by compiler-rt 661 // and libgcc since 9.3.1 662 assert(getTriple().isAArch64() && "expected AArch64 target!"); 663 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 664 if (RtLib == ToolChain::RLT_CompilerRT) 665 return true; 666 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 667 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 668 return false; 669 return true; 670 } 671 672 bool Linux::isNoExecStackDefault() const { 673 return getTriple().isAndroid(); 674 } 675 676 bool Linux::IsMathErrnoDefault() const { 677 if (getTriple().isAndroid()) 678 return false; 679 return Generic_ELF::IsMathErrnoDefault(); 680 } 681 682 SanitizerMask Linux::getSupportedSanitizers() const { 683 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 684 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 685 const bool IsMIPS = getTriple().isMIPS32(); 686 const bool IsMIPS64 = getTriple().isMIPS64(); 687 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 688 getTriple().getArch() == llvm::Triple::ppc64le; 689 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 690 getTriple().getArch() == llvm::Triple::aarch64_be; 691 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 692 getTriple().getArch() == llvm::Triple::thumb || 693 getTriple().getArch() == llvm::Triple::armeb || 694 getTriple().getArch() == llvm::Triple::thumbeb; 695 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 696 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 697 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 698 Res |= SanitizerKind::Address; 699 Res |= SanitizerKind::PointerCompare; 700 Res |= SanitizerKind::PointerSubtract; 701 Res |= SanitizerKind::Fuzzer; 702 Res |= SanitizerKind::FuzzerNoLink; 703 Res |= SanitizerKind::KernelAddress; 704 Res |= SanitizerKind::Memory; 705 Res |= SanitizerKind::Vptr; 706 Res |= SanitizerKind::SafeStack; 707 if (IsX86_64 || IsMIPS64 || IsAArch64) 708 Res |= SanitizerKind::DataFlow; 709 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 710 IsRISCV64 || IsSystemZ) 711 Res |= SanitizerKind::Leak; 712 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64) 713 Res |= SanitizerKind::Thread; 714 if (IsX86_64) 715 Res |= SanitizerKind::KernelMemory; 716 if (IsX86 || IsX86_64) 717 Res |= SanitizerKind::Function; 718 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 719 IsPowerPC64) 720 Res |= SanitizerKind::Scudo; 721 if (IsX86_64 || IsAArch64) { 722 Res |= SanitizerKind::HWAddress; 723 Res |= SanitizerKind::KernelHWAddress; 724 } 725 return Res; 726 } 727 728 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 729 llvm::opt::ArgStringList &CmdArgs) const { 730 // Add linker option -u__llvm_profile_runtime to cause runtime 731 // initialization module to be linked in. 732 if (needsProfileRT(Args)) 733 CmdArgs.push_back(Args.MakeArgString( 734 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 735 ToolChain::addProfileRTLibs(Args, CmdArgs); 736 } 737 738 llvm::DenormalMode 739 Linux::getDefaultDenormalModeForType(const llvm::opt::ArgList &DriverArgs, 740 const JobAction &JA, 741 const llvm::fltSemantics *FPType) const { 742 switch (getTriple().getArch()) { 743 case llvm::Triple::x86: 744 case llvm::Triple::x86_64: { 745 std::string Unused; 746 // DAZ and FTZ are turned on in crtfastmath.o 747 if (!DriverArgs.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) && 748 isFastMathRuntimeAvailable(DriverArgs, Unused)) 749 return llvm::DenormalMode::getPreserveSign(); 750 return llvm::DenormalMode::getIEEE(); 751 } 752 default: 753 return llvm::DenormalMode::getIEEE(); 754 } 755 } 756 757 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 758 for (const auto &Opt : ExtraOpts) 759 CmdArgs.push_back(Opt.c_str()); 760 } 761