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 && 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().find("opt/rh/devtoolset") != 210 StringRef::npos) 211 // With devtoolset on RHEL, we want to add a bin directory that is relative 212 // to the detected gcc install, because if we are using devtoolset gcc then 213 // we want to use other tools from devtoolset (e.g. ld) instead of the 214 // standard system tools. 215 PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + 216 "/../bin").str()); 217 218 if (Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb) 219 ExtraOpts.push_back("-X"); 220 221 const bool IsAndroid = Triple.isAndroid(); 222 const bool IsMips = Triple.isMIPS(); 223 const bool IsHexagon = Arch == llvm::Triple::hexagon; 224 const bool IsRISCV = Triple.isRISCV(); 225 226 if (IsMips && !SysRoot.empty()) 227 ExtraOpts.push_back("--sysroot=" + SysRoot); 228 229 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 230 // and the MIPS ABI require .dynsym to be sorted in different ways. 231 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 232 // ABI requires a mapping between the GOT and the symbol table. 233 // Android loader does not support .gnu.hash until API 23. 234 // Hexagon linker/loader does not support .gnu.hash 235 if (!IsMips && !IsHexagon) { 236 if (Distro.IsRedhat() || Distro.IsOpenSUSE() || Distro.IsAlpineLinux() || 237 (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick) || 238 (IsAndroid && !Triple.isAndroidVersionLT(23))) 239 ExtraOpts.push_back("--hash-style=gnu"); 240 241 if (Distro.IsDebian() || Distro.IsOpenSUSE() || 242 Distro == Distro::UbuntuLucid || Distro == Distro::UbuntuJaunty || 243 Distro == Distro::UbuntuKarmic || 244 (IsAndroid && Triple.isAndroidVersionLT(23))) 245 ExtraOpts.push_back("--hash-style=both"); 246 } 247 248 #ifdef ENABLE_LINKER_BUILD_ID 249 ExtraOpts.push_back("--build-id"); 250 #endif 251 252 if (IsAndroid || Distro.IsOpenSUSE()) 253 ExtraOpts.push_back("--enable-new-dtags"); 254 255 // The selection of paths to try here is designed to match the patterns which 256 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 257 // This was determined by running GCC in a fake filesystem, creating all 258 // possible permutations of these directories, and seeing which ones it added 259 // to the link paths. 260 path_list &Paths = getFilePaths(); 261 262 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 263 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 264 265 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 266 267 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 268 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); 269 270 if (IsAndroid) { 271 // Android sysroots contain a library directory for each supported OS 272 // version as well as some unversioned libraries in the usual multiarch 273 // directory. 274 unsigned Major; 275 unsigned Minor; 276 unsigned Micro; 277 Triple.getEnvironmentVersion(Major, Minor, Micro); 278 addPathIfExists(D, 279 SysRoot + "/usr/lib/" + MultiarchTriple + "/" + 280 llvm::to_string(Major), 281 Paths); 282 } 283 284 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 285 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 286 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 287 // this here. 288 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 289 Triple.isArch64Bit()) 290 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir, Paths); 291 else 292 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 293 if (IsRISCV) { 294 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 295 addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); 296 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); 297 } 298 299 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 300 301 // Similar to the logic for GCC above, if we are currently running Clang 302 // inside of the requested system root, add its parent library path to those 303 // searched. 304 // FIXME: It's not clear whether we should use the driver's installed 305 // directory ('Dir' below) or the ResourceDir. 306 if (StringRef(D.Dir).startswith(SysRoot)) 307 addPathIfExists(D, D.Dir + "/../lib", Paths); 308 309 addPathIfExists(D, SysRoot + "/lib", Paths); 310 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 311 } 312 313 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 314 if (getTriple().isAndroid()) 315 return ToolChain::RLT_CompilerRT; 316 return Generic_ELF::GetDefaultRuntimeLibType(); 317 } 318 319 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 320 if (getTriple().isAndroid()) 321 return ToolChain::CST_Libcxx; 322 return ToolChain::CST_Libstdcxx; 323 } 324 325 bool Linux::HasNativeLLVMSupport() const { return true; } 326 327 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 328 329 Tool *Linux::buildStaticLibTool() const { 330 return new tools::gnutools::StaticLibTool(*this); 331 } 332 333 Tool *Linux::buildAssembler() const { 334 return new tools::gnutools::Assembler(*this); 335 } 336 337 std::string Linux::computeSysRoot() const { 338 if (!getDriver().SysRoot.empty()) 339 return getDriver().SysRoot; 340 341 if (getTriple().isAndroid()) { 342 // Android toolchains typically include a sysroot at ../sysroot relative to 343 // the clang binary. 344 const StringRef ClangDir = getDriver().getInstalledDir(); 345 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 346 if (getVFS().exists(AndroidSysRootPath)) 347 return AndroidSysRootPath; 348 } 349 350 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 351 return std::string(); 352 353 // Standalone MIPS toolchains use different names for sysroot folder 354 // and put it into different places. Here we try to check some known 355 // variants. 356 357 const StringRef InstallDir = GCCInstallation.getInstallPath(); 358 const StringRef TripleStr = GCCInstallation.getTriple().str(); 359 const Multilib &Multilib = GCCInstallation.getMultilib(); 360 361 std::string Path = 362 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 363 .str(); 364 365 if (getVFS().exists(Path)) 366 return Path; 367 368 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 369 370 if (getVFS().exists(Path)) 371 return Path; 372 373 return std::string(); 374 } 375 376 std::string Linux::getDynamicLinker(const ArgList &Args) const { 377 const llvm::Triple::ArchType Arch = getArch(); 378 const llvm::Triple &Triple = getTriple(); 379 380 const Distro Distro(getDriver().getVFS(), Triple); 381 382 if (Triple.isAndroid()) 383 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 384 385 if (Triple.isMusl()) { 386 std::string ArchName; 387 bool IsArm = false; 388 389 switch (Arch) { 390 case llvm::Triple::arm: 391 case llvm::Triple::thumb: 392 ArchName = "arm"; 393 IsArm = true; 394 break; 395 case llvm::Triple::armeb: 396 case llvm::Triple::thumbeb: 397 ArchName = "armeb"; 398 IsArm = true; 399 break; 400 case llvm::Triple::x86: 401 ArchName = "i386"; 402 break; 403 case llvm::Triple::x86_64: 404 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 405 break; 406 default: 407 ArchName = Triple.getArchName().str(); 408 } 409 if (IsArm && 410 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 411 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 412 ArchName += "hf"; 413 414 return "/lib/ld-musl-" + ArchName + ".so.1"; 415 } 416 417 std::string LibDir; 418 std::string Loader; 419 420 switch (Arch) { 421 default: 422 llvm_unreachable("unsupported architecture"); 423 424 case llvm::Triple::aarch64: 425 LibDir = "lib"; 426 Loader = "ld-linux-aarch64.so.1"; 427 break; 428 case llvm::Triple::aarch64_be: 429 LibDir = "lib"; 430 Loader = "ld-linux-aarch64_be.so.1"; 431 break; 432 case llvm::Triple::arm: 433 case llvm::Triple::thumb: 434 case llvm::Triple::armeb: 435 case llvm::Triple::thumbeb: { 436 const bool HF = 437 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 438 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 439 440 LibDir = "lib"; 441 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 442 break; 443 } 444 case llvm::Triple::m68k: 445 LibDir = "lib"; 446 Loader = "ld.so.1"; 447 break; 448 case llvm::Triple::mips: 449 case llvm::Triple::mipsel: 450 case llvm::Triple::mips64: 451 case llvm::Triple::mips64el: { 452 bool IsNaN2008 = tools::mips::isNaN2008(Args, Triple); 453 454 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 455 456 if (tools::mips::isUCLibc(Args)) 457 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 458 else if (!Triple.hasEnvironment() && 459 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 460 Loader = 461 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 462 else 463 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 464 465 break; 466 } 467 case llvm::Triple::ppc: 468 LibDir = "lib"; 469 Loader = "ld.so.1"; 470 break; 471 case llvm::Triple::ppcle: 472 LibDir = "lib"; 473 Loader = "ld.so.1"; 474 break; 475 case llvm::Triple::ppc64: 476 LibDir = "lib64"; 477 Loader = 478 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 479 break; 480 case llvm::Triple::ppc64le: 481 LibDir = "lib64"; 482 Loader = 483 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 484 break; 485 case llvm::Triple::riscv32: { 486 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 487 LibDir = "lib"; 488 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 489 break; 490 } 491 case llvm::Triple::riscv64: { 492 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 493 LibDir = "lib"; 494 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 495 break; 496 } 497 case llvm::Triple::sparc: 498 case llvm::Triple::sparcel: 499 LibDir = "lib"; 500 Loader = "ld-linux.so.2"; 501 break; 502 case llvm::Triple::sparcv9: 503 LibDir = "lib64"; 504 Loader = "ld-linux.so.2"; 505 break; 506 case llvm::Triple::systemz: 507 LibDir = "lib"; 508 Loader = "ld64.so.1"; 509 break; 510 case llvm::Triple::x86: 511 LibDir = "lib"; 512 Loader = "ld-linux.so.2"; 513 break; 514 case llvm::Triple::x86_64: { 515 bool X32 = Triple.isX32(); 516 517 LibDir = X32 ? "libx32" : "lib64"; 518 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 519 break; 520 } 521 case llvm::Triple::ve: 522 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 523 } 524 525 if (Distro == Distro::Exherbo && 526 (Triple.getVendor() == llvm::Triple::UnknownVendor || 527 Triple.getVendor() == llvm::Triple::PC)) 528 return "/usr/" + Triple.str() + "/lib/" + Loader; 529 return "/" + LibDir + "/" + Loader; 530 } 531 532 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 533 ArgStringList &CC1Args) const { 534 const Driver &D = getDriver(); 535 std::string SysRoot = computeSysRoot(); 536 537 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 538 return; 539 540 // Add 'include' in the resource directory, which is similar to 541 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 542 // contains some files conflicting with system /usr/include. musl systems 543 // prefer the /usr/include copies which are more relevant. 544 SmallString<128> ResourceDirInclude(D.ResourceDir); 545 llvm::sys::path::append(ResourceDirInclude, "include"); 546 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 547 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 548 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 549 550 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 551 return; 552 553 // LOCAL_INCLUDE_DIR 554 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 555 // TOOL_INCLUDE_DIR 556 AddMultilibIncludeArgs(DriverArgs, CC1Args); 557 558 // Check for configure-time C include directories. 559 StringRef CIncludeDirs(C_INCLUDE_DIRS); 560 if (CIncludeDirs != "") { 561 SmallVector<StringRef, 5> dirs; 562 CIncludeDirs.split(dirs, ":"); 563 for (StringRef dir : dirs) { 564 StringRef Prefix = 565 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 566 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 567 } 568 return; 569 } 570 571 // On systems using multiarch and Android, add /usr/include/$triple before 572 // /usr/include. 573 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 574 if (!MultiarchIncludeDir.empty() && 575 D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir)) 576 addExternCSystemInclude(DriverArgs, CC1Args, 577 SysRoot + "/usr/include/" + MultiarchIncludeDir); 578 579 if (getTriple().getOS() == llvm::Triple::RTEMS) 580 return; 581 582 // Add an include of '/include' directly. This isn't provided by default by 583 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 584 // add even when Clang is acting as-if it were a system compiler. 585 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 586 587 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 588 589 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 590 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 591 } 592 593 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 594 llvm::opt::ArgStringList &CC1Args) const { 595 // We need a detected GCC installation on Linux to provide libstdc++'s 596 // headers in odd Linuxish places. 597 if (!GCCInstallation.isValid()) 598 return; 599 600 // Detect Debian g++-multiarch-incdir.diff. 601 StringRef TripleStr = GCCInstallation.getTriple().str(); 602 StringRef DebianMultiarch = 603 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 604 ? "i386-linux-gnu" 605 : TripleStr; 606 607 // Try generic GCC detection first. 608 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 609 DebianMultiarch)) 610 return; 611 612 StringRef LibDir = GCCInstallation.getParentLibPath(); 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 || IsSystemZ) 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