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().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(); 224 225 if (IsMips && !SysRoot.empty()) 226 ExtraOpts.push_back("--sysroot=" + SysRoot); 227 228 // Do not use 'gnu' hash style for Mips targets because .gnu.hash 229 // and the MIPS ABI require .dynsym to be sorted in different ways. 230 // .gnu.hash needs symbols to be grouped by hash code whereas the MIPS 231 // ABI requires a mapping between the GOT and the symbol table. 232 // Android loader does not support .gnu.hash until API 23. 233 // Hexagon linker/loader does not support .gnu.hash 234 if (!IsMips && !IsHexagon) { 235 if (Distro.IsRedhat() || Distro.IsOpenSUSE() || Distro.IsAlpineLinux() || 236 (Distro.IsUbuntu() && Distro >= Distro::UbuntuMaverick) || 237 (IsAndroid && !Triple.isAndroidVersionLT(23))) 238 ExtraOpts.push_back("--hash-style=gnu"); 239 240 if (Distro.IsDebian() || Distro.IsOpenSUSE() || 241 Distro == Distro::UbuntuLucid || Distro == Distro::UbuntuJaunty || 242 Distro == Distro::UbuntuKarmic || 243 (IsAndroid && Triple.isAndroidVersionLT(23))) 244 ExtraOpts.push_back("--hash-style=both"); 245 } 246 247 #ifdef ENABLE_LINKER_BUILD_ID 248 ExtraOpts.push_back("--build-id"); 249 #endif 250 251 if (IsAndroid || Distro.IsOpenSUSE()) 252 ExtraOpts.push_back("--enable-new-dtags"); 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, SysRoot + "/libo32", Paths); 269 addPathIfExists(D, SysRoot + "/usr/libo32", Paths); 270 } 271 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 272 273 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 274 addPathIfExists(D, 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 unsigned Major; 281 unsigned Minor; 282 unsigned Micro; 283 Triple.getEnvironmentVersion(Major, Minor, Micro); 284 addPathIfExists(D, 285 SysRoot + "/usr/lib/" + MultiarchTriple + "/" + 286 llvm::to_string(Major), 287 Paths); 288 } 289 290 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 291 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 292 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 293 // this here. 294 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 295 Triple.isArch64Bit()) 296 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir, Paths); 297 else 298 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 299 if (IsRISCV) { 300 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 301 addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); 302 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); 303 } 304 305 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 306 307 // Similar to the logic for GCC above, if we are currently running Clang 308 // inside of the requested system root, add its parent library path to those 309 // searched. 310 // FIXME: It's not clear whether we should use the driver's installed 311 // directory ('Dir' below) or the ResourceDir. 312 if (StringRef(D.Dir).startswith(SysRoot)) { 313 // Even if OSLibDir != "lib", this is needed for Clang in the build 314 // directory (not installed) to find libc++. 315 addPathIfExists(D, D.Dir + "/../lib", Paths); 316 if (OSLibDir != "lib") 317 addPathIfExists(D, D.Dir + "/../" + OSLibDir, Paths); 318 } 319 320 addPathIfExists(D, SysRoot + "/lib", Paths); 321 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 322 } 323 324 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 325 if (getTriple().isAndroid()) 326 return ToolChain::RLT_CompilerRT; 327 return Generic_ELF::GetDefaultRuntimeLibType(); 328 } 329 330 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 331 if (getTriple().isAndroid()) 332 return ToolChain::CST_Libcxx; 333 return ToolChain::CST_Libstdcxx; 334 } 335 336 bool Linux::HasNativeLLVMSupport() const { return true; } 337 338 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 339 340 Tool *Linux::buildStaticLibTool() const { 341 return new tools::gnutools::StaticLibTool(*this); 342 } 343 344 Tool *Linux::buildAssembler() const { 345 return new tools::gnutools::Assembler(*this); 346 } 347 348 std::string Linux::computeSysRoot() const { 349 if (!getDriver().SysRoot.empty()) 350 return getDriver().SysRoot; 351 352 if (getTriple().isAndroid()) { 353 // Android toolchains typically include a sysroot at ../sysroot relative to 354 // the clang binary. 355 const StringRef ClangDir = getDriver().getInstalledDir(); 356 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 357 if (getVFS().exists(AndroidSysRootPath)) 358 return AndroidSysRootPath; 359 } 360 361 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 362 return std::string(); 363 364 // Standalone MIPS toolchains use different names for sysroot folder 365 // and put it into different places. Here we try to check some known 366 // variants. 367 368 const StringRef InstallDir = GCCInstallation.getInstallPath(); 369 const StringRef TripleStr = GCCInstallation.getTriple().str(); 370 const Multilib &Multilib = GCCInstallation.getMultilib(); 371 372 std::string Path = 373 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 374 .str(); 375 376 if (getVFS().exists(Path)) 377 return Path; 378 379 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 380 381 if (getVFS().exists(Path)) 382 return Path; 383 384 return std::string(); 385 } 386 387 std::string Linux::getDynamicLinker(const ArgList &Args) const { 388 const llvm::Triple::ArchType Arch = getArch(); 389 const llvm::Triple &Triple = getTriple(); 390 391 const Distro Distro(getDriver().getVFS(), Triple); 392 393 if (Triple.isAndroid()) 394 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 395 396 if (Triple.isMusl()) { 397 std::string ArchName; 398 bool IsArm = false; 399 400 switch (Arch) { 401 case llvm::Triple::arm: 402 case llvm::Triple::thumb: 403 ArchName = "arm"; 404 IsArm = true; 405 break; 406 case llvm::Triple::armeb: 407 case llvm::Triple::thumbeb: 408 ArchName = "armeb"; 409 IsArm = true; 410 break; 411 case llvm::Triple::x86: 412 ArchName = "i386"; 413 break; 414 case llvm::Triple::x86_64: 415 ArchName = Triple.isX32() ? "x32" : Triple.getArchName().str(); 416 break; 417 default: 418 ArchName = Triple.getArchName().str(); 419 } 420 if (IsArm && 421 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 422 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 423 ArchName += "hf"; 424 if (Arch == llvm::Triple::ppc && 425 Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 426 ArchName = "powerpc-sf"; 427 428 return "/lib/ld-musl-" + ArchName + ".so.1"; 429 } 430 431 std::string LibDir; 432 std::string Loader; 433 434 switch (Arch) { 435 default: 436 llvm_unreachable("unsupported architecture"); 437 438 case llvm::Triple::aarch64: 439 LibDir = "lib"; 440 Loader = "ld-linux-aarch64.so.1"; 441 break; 442 case llvm::Triple::aarch64_be: 443 LibDir = "lib"; 444 Loader = "ld-linux-aarch64_be.so.1"; 445 break; 446 case llvm::Triple::arm: 447 case llvm::Triple::thumb: 448 case llvm::Triple::armeb: 449 case llvm::Triple::thumbeb: { 450 const bool HF = 451 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 452 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 453 454 LibDir = "lib"; 455 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 456 break; 457 } 458 case llvm::Triple::m68k: 459 LibDir = "lib"; 460 Loader = "ld.so.1"; 461 break; 462 case llvm::Triple::mips: 463 case llvm::Triple::mipsel: 464 case llvm::Triple::mips64: 465 case llvm::Triple::mips64el: { 466 bool IsNaN2008 = tools::mips::isNaN2008(getDriver(), Args, Triple); 467 468 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 469 470 if (tools::mips::isUCLibc(Args)) 471 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 472 else if (!Triple.hasEnvironment() && 473 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 474 Loader = 475 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 476 else 477 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 478 479 break; 480 } 481 case llvm::Triple::ppc: 482 LibDir = "lib"; 483 Loader = "ld.so.1"; 484 break; 485 case llvm::Triple::ppcle: 486 LibDir = "lib"; 487 Loader = "ld.so.1"; 488 break; 489 case llvm::Triple::ppc64: 490 LibDir = "lib64"; 491 Loader = 492 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 493 break; 494 case llvm::Triple::ppc64le: 495 LibDir = "lib64"; 496 Loader = 497 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 498 break; 499 case llvm::Triple::riscv32: { 500 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 501 LibDir = "lib"; 502 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 503 break; 504 } 505 case llvm::Triple::riscv64: { 506 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 507 LibDir = "lib"; 508 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 509 break; 510 } 511 case llvm::Triple::sparc: 512 case llvm::Triple::sparcel: 513 LibDir = "lib"; 514 Loader = "ld-linux.so.2"; 515 break; 516 case llvm::Triple::sparcv9: 517 LibDir = "lib64"; 518 Loader = "ld-linux.so.2"; 519 break; 520 case llvm::Triple::systemz: 521 LibDir = "lib"; 522 Loader = "ld64.so.1"; 523 break; 524 case llvm::Triple::x86: 525 LibDir = "lib"; 526 Loader = "ld-linux.so.2"; 527 break; 528 case llvm::Triple::x86_64: { 529 bool X32 = Triple.isX32(); 530 531 LibDir = X32 ? "libx32" : "lib64"; 532 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 533 break; 534 } 535 case llvm::Triple::ve: 536 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 537 } 538 539 if (Distro == Distro::Exherbo && 540 (Triple.getVendor() == llvm::Triple::UnknownVendor || 541 Triple.getVendor() == llvm::Triple::PC)) 542 return "/usr/" + Triple.str() + "/lib/" + Loader; 543 return "/" + LibDir + "/" + Loader; 544 } 545 546 void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 547 ArgStringList &CC1Args) const { 548 const Driver &D = getDriver(); 549 std::string SysRoot = computeSysRoot(); 550 551 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 552 return; 553 554 // Add 'include' in the resource directory, which is similar to 555 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 556 // contains some files conflicting with system /usr/include. musl systems 557 // prefer the /usr/include copies which are more relevant. 558 SmallString<128> ResourceDirInclude(D.ResourceDir); 559 llvm::sys::path::append(ResourceDirInclude, "include"); 560 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 561 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 562 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 563 564 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 565 return; 566 567 // LOCAL_INCLUDE_DIR 568 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 569 // TOOL_INCLUDE_DIR 570 AddMultilibIncludeArgs(DriverArgs, CC1Args); 571 572 // Check for configure-time C include directories. 573 StringRef CIncludeDirs(C_INCLUDE_DIRS); 574 if (CIncludeDirs != "") { 575 SmallVector<StringRef, 5> dirs; 576 CIncludeDirs.split(dirs, ":"); 577 for (StringRef dir : dirs) { 578 StringRef Prefix = 579 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 580 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 581 } 582 return; 583 } 584 585 // On systems using multiarch and Android, add /usr/include/$triple before 586 // /usr/include. 587 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 588 if (!MultiarchIncludeDir.empty() && 589 D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir)) 590 addExternCSystemInclude(DriverArgs, CC1Args, 591 SysRoot + "/usr/include/" + MultiarchIncludeDir); 592 593 if (getTriple().getOS() == llvm::Triple::RTEMS) 594 return; 595 596 // Add an include of '/include' directly. This isn't provided by default by 597 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 598 // add even when Clang is acting as-if it were a system compiler. 599 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 600 601 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 602 603 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 604 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 605 } 606 607 void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 608 llvm::opt::ArgStringList &CC1Args) const { 609 // We need a detected GCC installation on Linux to provide libstdc++'s 610 // headers in odd Linuxish places. 611 if (!GCCInstallation.isValid()) 612 return; 613 614 // Detect Debian g++-multiarch-incdir.diff. 615 StringRef TripleStr = GCCInstallation.getTriple().str(); 616 StringRef DebianMultiarch = 617 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 618 ? "i386-linux-gnu" 619 : TripleStr; 620 621 // Try generic GCC detection first. 622 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 623 DebianMultiarch)) 624 return; 625 626 StringRef LibDir = GCCInstallation.getParentLibPath(); 627 const Multilib &Multilib = GCCInstallation.getMultilib(); 628 const GCCVersion &Version = GCCInstallation.getVersion(); 629 630 const std::string LibStdCXXIncludePathCandidates[] = { 631 // Android standalone toolchain has C++ headers in yet another place. 632 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 633 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 634 // without a subdirectory corresponding to the gcc version. 635 LibDir.str() + "/../include/c++", 636 // Cray's gcc installation puts headers under "g++" without a 637 // version suffix. 638 LibDir.str() + "/../include/g++", 639 }; 640 641 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 642 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 643 Multilib.includeSuffix(), DriverArgs, CC1Args)) 644 break; 645 } 646 } 647 648 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 649 ArgStringList &CC1Args) const { 650 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args); 651 } 652 653 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 654 ArgStringList &CC1Args) const { 655 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args); 656 } 657 658 void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 659 ArgStringList &CC1Args) const { 660 if (GCCInstallation.isValid()) { 661 CC1Args.push_back("-isystem"); 662 CC1Args.push_back(DriverArgs.MakeArgString( 663 GCCInstallation.getParentLibPath() + "/../" + 664 GCCInstallation.getTriple().str() + "/include")); 665 } 666 } 667 668 bool Linux::isPIEDefault(const llvm::opt::ArgList &Args) const { 669 return getTriple().isAndroid() || getTriple().isMusl() || 670 getSanitizerArgs(Args).requiresPIE(); 671 } 672 673 bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 674 // Outline atomics for AArch64 are supported by compiler-rt 675 // and libgcc since 9.3.1 676 assert(getTriple().isAArch64() && "expected AArch64 target!"); 677 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 678 if (RtLib == ToolChain::RLT_CompilerRT) 679 return true; 680 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 681 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 682 return false; 683 return true; 684 } 685 686 bool Linux::IsMathErrnoDefault() const { 687 if (getTriple().isAndroid()) 688 return false; 689 return Generic_ELF::IsMathErrnoDefault(); 690 } 691 692 SanitizerMask Linux::getSupportedSanitizers() const { 693 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 694 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 695 const bool IsMIPS = getTriple().isMIPS32(); 696 const bool IsMIPS64 = getTriple().isMIPS64(); 697 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 698 getTriple().getArch() == llvm::Triple::ppc64le; 699 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 700 getTriple().getArch() == llvm::Triple::aarch64_be; 701 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 702 getTriple().getArch() == llvm::Triple::thumb || 703 getTriple().getArch() == llvm::Triple::armeb || 704 getTriple().getArch() == llvm::Triple::thumbeb; 705 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 706 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 707 const bool IsHexagon = getTriple().getArch() == llvm::Triple::hexagon; 708 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 709 Res |= SanitizerKind::Address; 710 Res |= SanitizerKind::PointerCompare; 711 Res |= SanitizerKind::PointerSubtract; 712 Res |= SanitizerKind::Fuzzer; 713 Res |= SanitizerKind::FuzzerNoLink; 714 Res |= SanitizerKind::KernelAddress; 715 Res |= SanitizerKind::Memory; 716 Res |= SanitizerKind::Vptr; 717 Res |= SanitizerKind::SafeStack; 718 if (IsX86_64 || IsMIPS64 || IsAArch64) 719 Res |= SanitizerKind::DataFlow; 720 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 721 IsRISCV64 || IsSystemZ || IsHexagon) 722 Res |= SanitizerKind::Leak; 723 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64 || IsSystemZ) 724 Res |= SanitizerKind::Thread; 725 if (IsX86_64) 726 Res |= SanitizerKind::KernelMemory; 727 if (IsX86 || IsX86_64) 728 Res |= SanitizerKind::Function; 729 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 730 IsPowerPC64 || IsHexagon) 731 Res |= SanitizerKind::Scudo; 732 if (IsX86_64 || IsAArch64) { 733 Res |= SanitizerKind::HWAddress; 734 Res |= SanitizerKind::KernelHWAddress; 735 } 736 return Res; 737 } 738 739 void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 740 llvm::opt::ArgStringList &CmdArgs) const { 741 // Add linker option -u__llvm_profile_runtime to cause runtime 742 // initialization module to be linked in. 743 if (needsProfileRT(Args)) 744 CmdArgs.push_back(Args.MakeArgString( 745 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 746 ToolChain::addProfileRTLibs(Args, CmdArgs); 747 } 748 749 llvm::DenormalMode 750 Linux::getDefaultDenormalModeForType(const llvm::opt::ArgList &DriverArgs, 751 const JobAction &JA, 752 const llvm::fltSemantics *FPType) const { 753 switch (getTriple().getArch()) { 754 case llvm::Triple::x86: 755 case llvm::Triple::x86_64: { 756 std::string Unused; 757 // DAZ and FTZ are turned on in crtfastmath.o 758 if (!DriverArgs.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) && 759 isFastMathRuntimeAvailable(DriverArgs, Unused)) 760 return llvm::DenormalMode::getPreserveSign(); 761 return llvm::DenormalMode::getIEEE(); 762 } 763 default: 764 return llvm::DenormalMode::getIEEE(); 765 } 766 } 767 768 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 769 for (const auto &Opt : ExtraOpts) 770 CmdArgs.push_back(Opt.c_str()); 771 } 772