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 27using namespace clang::driver; 28using namespace clang::driver::toolchains; 29using namespace clang; 30using namespace llvm::opt; 31 32using 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. 40std::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 137static 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 179Linux::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 // The selection of paths to try here is designed to match the patterns which 257 // the GCC driver itself uses, as this is part of the GCC-compatible driver. 258 // This was determined by running GCC in a fake filesystem, creating all 259 // possible permutations of these directories, and seeing which ones it added 260 // to the link paths. 261 path_list &Paths = getFilePaths(); 262 263 const std::string OSLibDir = std::string(getOSLibDir(Triple, Args)); 264 const std::string MultiarchTriple = getMultiarchTriple(D, Triple, SysRoot); 265 266 Generic_GCC::AddMultilibPaths(D, SysRoot, OSLibDir, MultiarchTriple, Paths); 267 268 addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths); 269 addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths); 270 271 if (IsAndroid) { 272 // Android sysroots contain a library directory for each supported OS 273 // version as well as some unversioned libraries in the usual multiarch 274 // directory. 275 unsigned Major; 276 unsigned Minor; 277 unsigned Micro; 278 Triple.getEnvironmentVersion(Major, Minor, Micro); 279 addPathIfExists(D, 280 SysRoot + "/usr/lib/" + MultiarchTriple + "/" + 281 llvm::to_string(Major), 282 Paths); 283 } 284 285 addPathIfExists(D, SysRoot + "/usr/lib/" + MultiarchTriple, Paths); 286 // 64-bit OpenEmbedded sysroots may not have a /usr/lib dir. So they cannot 287 // find /usr/lib64 as it is referenced as /usr/lib/../lib64. So we handle 288 // this here. 289 if (Triple.getVendor() == llvm::Triple::OpenEmbedded && 290 Triple.isArch64Bit()) 291 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir, Paths); 292 else 293 addPathIfExists(D, SysRoot + "/usr/lib/../" + OSLibDir, Paths); 294 if (IsRISCV) { 295 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 296 addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths); 297 addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths); 298 } 299 300 Generic_GCC::AddMultiarchPaths(D, SysRoot, OSLibDir, Paths); 301 302 // Similar to the logic for GCC above, if we are currently running Clang 303 // inside of the requested system root, add its parent library path to those 304 // searched. 305 // FIXME: It's not clear whether we should use the driver's installed 306 // directory ('Dir' below) or the ResourceDir. 307 if (StringRef(D.Dir).startswith(SysRoot)) 308 addPathIfExists(D, D.Dir + "/../lib", Paths); 309 310 addPathIfExists(D, SysRoot + "/lib", Paths); 311 addPathIfExists(D, SysRoot + "/usr/lib", Paths); 312} 313 314ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const { 315 if (getTriple().isAndroid()) 316 return ToolChain::RLT_CompilerRT; 317 return Generic_ELF::GetDefaultRuntimeLibType(); 318} 319 320ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const { 321 if (getTriple().isAndroid()) 322 return ToolChain::CST_Libcxx; 323 return ToolChain::CST_Libstdcxx; 324} 325 326bool Linux::HasNativeLLVMSupport() const { return true; } 327 328Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); } 329 330Tool *Linux::buildStaticLibTool() const { 331 return new tools::gnutools::StaticLibTool(*this); 332} 333 334Tool *Linux::buildAssembler() const { 335 return new tools::gnutools::Assembler(*this); 336} 337 338std::string Linux::computeSysRoot() const { 339 if (!getDriver().SysRoot.empty()) 340 return getDriver().SysRoot; 341 342 if (getTriple().isAndroid()) { 343 // Android toolchains typically include a sysroot at ../sysroot relative to 344 // the clang binary. 345 const StringRef ClangDir = getDriver().getInstalledDir(); 346 std::string AndroidSysRootPath = (ClangDir + "/../sysroot").str(); 347 if (getVFS().exists(AndroidSysRootPath)) 348 return AndroidSysRootPath; 349 } 350 351 if (!GCCInstallation.isValid() || !getTriple().isMIPS()) 352 return std::string(); 353 354 // Standalone MIPS toolchains use different names for sysroot folder 355 // and put it into different places. Here we try to check some known 356 // variants. 357 358 const StringRef InstallDir = GCCInstallation.getInstallPath(); 359 const StringRef TripleStr = GCCInstallation.getTriple().str(); 360 const Multilib &Multilib = GCCInstallation.getMultilib(); 361 362 std::string Path = 363 (InstallDir + "/../../../../" + TripleStr + "/libc" + Multilib.osSuffix()) 364 .str(); 365 366 if (getVFS().exists(Path)) 367 return Path; 368 369 Path = (InstallDir + "/../../../../sysroot" + Multilib.osSuffix()).str(); 370 371 if (getVFS().exists(Path)) 372 return Path; 373 374 return std::string(); 375} 376 377std::string Linux::getDynamicLinker(const ArgList &Args) const { 378 const llvm::Triple::ArchType Arch = getArch(); 379 const llvm::Triple &Triple = getTriple(); 380 381 const Distro Distro(getDriver().getVFS(), Triple); 382 383 if (Triple.isAndroid()) 384 return Triple.isArch64Bit() ? "/system/bin/linker64" : "/system/bin/linker"; 385 386 if (Triple.isMusl()) { 387 std::string ArchName; 388 bool IsArm = false; 389 390 switch (Arch) { 391 case llvm::Triple::arm: 392 case llvm::Triple::thumb: 393 ArchName = "arm"; 394 IsArm = true; 395 break; 396 case llvm::Triple::armeb: 397 case llvm::Triple::thumbeb: 398 ArchName = "armeb"; 399 IsArm = true; 400 break; 401 case llvm::Triple::x86: 402 ArchName = "i386"; 403 break; 404 case llvm::Triple::x86_64: 405 ArchName = Triple.getEnvironment() == llvm::Triple::MuslX32 406 ? "x32" 407 : Triple.getArchName().str(); 408 break; 409 default: 410 ArchName = Triple.getArchName().str(); 411 } 412 if (IsArm && 413 (Triple.getEnvironment() == llvm::Triple::MuslEABIHF || 414 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard)) 415 ArchName += "hf"; 416 417 return "/lib/ld-musl-" + ArchName + ".so.1"; 418 } 419 420 std::string LibDir; 421 std::string Loader; 422 423 switch (Arch) { 424 default: 425 llvm_unreachable("unsupported architecture"); 426 427 case llvm::Triple::aarch64: 428 LibDir = "lib"; 429 Loader = "ld-linux-aarch64.so.1"; 430 break; 431 case llvm::Triple::aarch64_be: 432 LibDir = "lib"; 433 Loader = "ld-linux-aarch64_be.so.1"; 434 break; 435 case llvm::Triple::arm: 436 case llvm::Triple::thumb: 437 case llvm::Triple::armeb: 438 case llvm::Triple::thumbeb: { 439 const bool HF = 440 Triple.getEnvironment() == llvm::Triple::GNUEABIHF || 441 tools::arm::getARMFloatABI(*this, Args) == tools::arm::FloatABI::Hard; 442 443 LibDir = "lib"; 444 Loader = HF ? "ld-linux-armhf.so.3" : "ld-linux.so.3"; 445 break; 446 } 447 case llvm::Triple::m68k: 448 LibDir = "lib"; 449 Loader = "ld.so.1"; 450 break; 451 case llvm::Triple::mips: 452 case llvm::Triple::mipsel: 453 case llvm::Triple::mips64: 454 case llvm::Triple::mips64el: { 455 bool IsNaN2008 = tools::mips::isNaN2008(Args, Triple); 456 457 LibDir = "lib" + tools::mips::getMipsABILibSuffix(Args, Triple); 458 459 if (tools::mips::isUCLibc(Args)) 460 Loader = IsNaN2008 ? "ld-uClibc-mipsn8.so.0" : "ld-uClibc.so.0"; 461 else if (!Triple.hasEnvironment() && 462 Triple.getVendor() == llvm::Triple::VendorType::MipsTechnologies) 463 Loader = 464 Triple.isLittleEndian() ? "ld-musl-mipsel.so.1" : "ld-musl-mips.so.1"; 465 else 466 Loader = IsNaN2008 ? "ld-linux-mipsn8.so.1" : "ld.so.1"; 467 468 break; 469 } 470 case llvm::Triple::ppc: 471 LibDir = "lib"; 472 Loader = "ld.so.1"; 473 break; 474 case llvm::Triple::ppcle: 475 LibDir = "lib"; 476 Loader = "ld.so.1"; 477 break; 478 case llvm::Triple::ppc64: 479 LibDir = "lib64"; 480 Loader = 481 (tools::ppc::hasPPCAbiArg(Args, "elfv2")) ? "ld64.so.2" : "ld64.so.1"; 482 break; 483 case llvm::Triple::ppc64le: 484 LibDir = "lib64"; 485 Loader = 486 (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2"; 487 break; 488 case llvm::Triple::riscv32: { 489 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 490 LibDir = "lib"; 491 Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str(); 492 break; 493 } 494 case llvm::Triple::riscv64: { 495 StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple); 496 LibDir = "lib"; 497 Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str(); 498 break; 499 } 500 case llvm::Triple::sparc: 501 case llvm::Triple::sparcel: 502 LibDir = "lib"; 503 Loader = "ld-linux.so.2"; 504 break; 505 case llvm::Triple::sparcv9: 506 LibDir = "lib64"; 507 Loader = "ld-linux.so.2"; 508 break; 509 case llvm::Triple::systemz: 510 LibDir = "lib"; 511 Loader = "ld64.so.1"; 512 break; 513 case llvm::Triple::x86: 514 LibDir = "lib"; 515 Loader = "ld-linux.so.2"; 516 break; 517 case llvm::Triple::x86_64: { 518 bool X32 = Triple.getEnvironment() == llvm::Triple::GNUX32; 519 520 LibDir = X32 ? "libx32" : "lib64"; 521 Loader = X32 ? "ld-linux-x32.so.2" : "ld-linux-x86-64.so.2"; 522 break; 523 } 524 case llvm::Triple::ve: 525 return "/opt/nec/ve/lib/ld-linux-ve.so.1"; 526 } 527 528 if (Distro == Distro::Exherbo && 529 (Triple.getVendor() == llvm::Triple::UnknownVendor || 530 Triple.getVendor() == llvm::Triple::PC)) 531 return "/usr/" + Triple.str() + "/lib/" + Loader; 532 return "/" + LibDir + "/" + Loader; 533} 534 535void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, 536 ArgStringList &CC1Args) const { 537 const Driver &D = getDriver(); 538 std::string SysRoot = computeSysRoot(); 539 540 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 541 return; 542 543 // Add 'include' in the resource directory, which is similar to 544 // GCC_INCLUDE_DIR (private headers) in GCC. Note: the include directory 545 // contains some files conflicting with system /usr/include. musl systems 546 // prefer the /usr/include copies which are more relevant. 547 SmallString<128> ResourceDirInclude(D.ResourceDir); 548 llvm::sys::path::append(ResourceDirInclude, "include"); 549 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && 550 (!getTriple().isMusl() || DriverArgs.hasArg(options::OPT_nostdlibinc))) 551 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 552 553 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 554 return; 555 556 // LOCAL_INCLUDE_DIR 557 addSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/local/include"); 558 // TOOL_INCLUDE_DIR 559 AddMultilibIncludeArgs(DriverArgs, CC1Args); 560 561 // Check for configure-time C include directories. 562 StringRef CIncludeDirs(C_INCLUDE_DIRS); 563 if (CIncludeDirs != "") { 564 SmallVector<StringRef, 5> dirs; 565 CIncludeDirs.split(dirs, ":"); 566 for (StringRef dir : dirs) { 567 StringRef Prefix = 568 llvm::sys::path::is_absolute(dir) ? "" : StringRef(SysRoot); 569 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 570 } 571 return; 572 } 573 574 // On systems using multiarch and Android, add /usr/include/$triple before 575 // /usr/include. 576 std::string MultiarchIncludeDir = getMultiarchTriple(D, getTriple(), SysRoot); 577 if (!MultiarchIncludeDir.empty() && 578 D.getVFS().exists(SysRoot + "/usr/include/" + MultiarchIncludeDir)) 579 addExternCSystemInclude(DriverArgs, CC1Args, 580 SysRoot + "/usr/include/" + MultiarchIncludeDir); 581 582 if (getTriple().getOS() == llvm::Triple::RTEMS) 583 return; 584 585 // Add an include of '/include' directly. This isn't provided by default by 586 // system GCCs, but is often used with cross-compiling GCCs, and harmless to 587 // add even when Clang is acting as-if it were a system compiler. 588 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/include"); 589 590 addExternCSystemInclude(DriverArgs, CC1Args, SysRoot + "/usr/include"); 591 592 if (!DriverArgs.hasArg(options::OPT_nobuiltininc) && getTriple().isMusl()) 593 addSystemInclude(DriverArgs, CC1Args, ResourceDirInclude); 594} 595 596void Linux::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 597 llvm::opt::ArgStringList &CC1Args) const { 598 // We need a detected GCC installation on Linux to provide libstdc++'s 599 // headers in odd Linuxish places. 600 if (!GCCInstallation.isValid()) 601 return; 602 603 // Detect Debian g++-multiarch-incdir.diff. 604 StringRef TripleStr = GCCInstallation.getTriple().str(); 605 StringRef DebianMultiarch = 606 GCCInstallation.getTriple().getArch() == llvm::Triple::x86 607 ? "i386-linux-gnu" 608 : TripleStr; 609 610 // Try generic GCC detection first. 611 if (Generic_GCC::addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args, 612 DebianMultiarch)) 613 return; 614 615 StringRef LibDir = GCCInstallation.getParentLibPath(); 616 const Multilib &Multilib = GCCInstallation.getMultilib(); 617 const GCCVersion &Version = GCCInstallation.getVersion(); 618 619 const std::string LibStdCXXIncludePathCandidates[] = { 620 // Android standalone toolchain has C++ headers in yet another place. 621 LibDir.str() + "/../" + TripleStr.str() + "/include/c++/" + Version.Text, 622 // Freescale SDK C++ headers are directly in <sysroot>/usr/include/c++, 623 // without a subdirectory corresponding to the gcc version. 624 LibDir.str() + "/../include/c++", 625 // Cray's gcc installation puts headers under "g++" without a 626 // version suffix. 627 LibDir.str() + "/../include/g++", 628 }; 629 630 for (const auto &IncludePath : LibStdCXXIncludePathCandidates) { 631 if (addLibStdCXXIncludePaths(IncludePath, TripleStr, 632 Multilib.includeSuffix(), DriverArgs, CC1Args)) 633 break; 634 } 635} 636 637void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs, 638 ArgStringList &CC1Args) const { 639 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args); 640} 641 642void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs, 643 ArgStringList &CC1Args) const { 644 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args); 645} 646 647void Linux::AddIAMCUIncludeArgs(const ArgList &DriverArgs, 648 ArgStringList &CC1Args) const { 649 if (GCCInstallation.isValid()) { 650 CC1Args.push_back("-isystem"); 651 CC1Args.push_back(DriverArgs.MakeArgString( 652 GCCInstallation.getParentLibPath() + "/../" + 653 GCCInstallation.getTriple().str() + "/include")); 654 } 655} 656 657bool Linux::isPIEDefault() const { 658 return (getTriple().isAndroid() && !getTriple().isAndroidVersionLT(16)) || 659 getTriple().isMusl() || getSanitizerArgs().requiresPIE(); 660} 661 662bool Linux::IsAArch64OutlineAtomicsDefault(const ArgList &Args) const { 663 // Outline atomics for AArch64 are supported by compiler-rt 664 // and libgcc since 9.3.1 665 assert(getTriple().isAArch64() && "expected AArch64 target!"); 666 ToolChain::RuntimeLibType RtLib = GetRuntimeLibType(Args); 667 if (RtLib == ToolChain::RLT_CompilerRT) 668 return true; 669 assert(RtLib == ToolChain::RLT_Libgcc && "unexpected runtime library type!"); 670 if (GCCInstallation.getVersion().isOlderThan(9, 3, 1)) 671 return false; 672 return true; 673} 674 675bool Linux::isNoExecStackDefault() const { 676 return getTriple().isAndroid(); 677} 678 679bool Linux::IsMathErrnoDefault() const { 680 if (getTriple().isAndroid()) 681 return false; 682 return Generic_ELF::IsMathErrnoDefault(); 683} 684 685SanitizerMask Linux::getSupportedSanitizers() const { 686 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 687 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 688 const bool IsMIPS = getTriple().isMIPS32(); 689 const bool IsMIPS64 = getTriple().isMIPS64(); 690 const bool IsPowerPC64 = getTriple().getArch() == llvm::Triple::ppc64 || 691 getTriple().getArch() == llvm::Triple::ppc64le; 692 const bool IsAArch64 = getTriple().getArch() == llvm::Triple::aarch64 || 693 getTriple().getArch() == llvm::Triple::aarch64_be; 694 const bool IsArmArch = getTriple().getArch() == llvm::Triple::arm || 695 getTriple().getArch() == llvm::Triple::thumb || 696 getTriple().getArch() == llvm::Triple::armeb || 697 getTriple().getArch() == llvm::Triple::thumbeb; 698 const bool IsRISCV64 = getTriple().getArch() == llvm::Triple::riscv64; 699 const bool IsSystemZ = getTriple().getArch() == llvm::Triple::systemz; 700 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 701 Res |= SanitizerKind::Address; 702 Res |= SanitizerKind::PointerCompare; 703 Res |= SanitizerKind::PointerSubtract; 704 Res |= SanitizerKind::Fuzzer; 705 Res |= SanitizerKind::FuzzerNoLink; 706 Res |= SanitizerKind::KernelAddress; 707 Res |= SanitizerKind::Memory; 708 Res |= SanitizerKind::Vptr; 709 Res |= SanitizerKind::SafeStack; 710 if (IsX86_64 || IsMIPS64 || IsAArch64) 711 Res |= SanitizerKind::DataFlow; 712 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch || IsPowerPC64 || 713 IsRISCV64 || IsSystemZ) 714 Res |= SanitizerKind::Leak; 715 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsPowerPC64) 716 Res |= SanitizerKind::Thread; 717 if (IsX86_64) 718 Res |= SanitizerKind::KernelMemory; 719 if (IsX86 || IsX86_64) 720 Res |= SanitizerKind::Function; 721 if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsMIPS || IsArmArch || 722 IsPowerPC64) 723 Res |= SanitizerKind::Scudo; 724 if (IsX86_64 || IsAArch64) { 725 Res |= SanitizerKind::HWAddress; 726 Res |= SanitizerKind::KernelHWAddress; 727 } 728 return Res; 729} 730 731void Linux::addProfileRTLibs(const llvm::opt::ArgList &Args, 732 llvm::opt::ArgStringList &CmdArgs) const { 733 // Add linker option -u__llvm_profile_runtime to cause runtime 734 // initialization module to be linked in. 735 if (needsProfileRT(Args)) 736 CmdArgs.push_back(Args.MakeArgString( 737 Twine("-u", llvm::getInstrProfRuntimeHookVarName()))); 738 ToolChain::addProfileRTLibs(Args, CmdArgs); 739} 740 741llvm::DenormalMode 742Linux::getDefaultDenormalModeForType(const llvm::opt::ArgList &DriverArgs, 743 const JobAction &JA, 744 const llvm::fltSemantics *FPType) const { 745 switch (getTriple().getArch()) { 746 case llvm::Triple::x86: 747 case llvm::Triple::x86_64: { 748 std::string Unused; 749 // DAZ and FTZ are turned on in crtfastmath.o 750 if (!DriverArgs.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles) && 751 isFastMathRuntimeAvailable(DriverArgs, Unused)) 752 return llvm::DenormalMode::getPreserveSign(); 753 return llvm::DenormalMode::getIEEE(); 754 } 755 default: 756 return llvm::DenormalMode::getIEEE(); 757 } 758} 759 760void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const { 761 for (const auto &Opt : ExtraOpts) 762 CmdArgs.push_back(Opt.c_str()); 763} 764