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.
getMultiarchTriple(const Driver & D,const llvm::Triple & TargetTriple,StringRef SysRoot) const40 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
getOSLibDir(const llvm::Triple & Triple,const ArgList & Args)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
Linux(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)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
GetDefaultRuntimeLibType() const313 ToolChain::RuntimeLibType Linux::GetDefaultRuntimeLibType() const {
314 if (getTriple().isAndroid())
315 return ToolChain::RLT_CompilerRT;
316 return Generic_ELF::GetDefaultRuntimeLibType();
317 }
318
GetDefaultCXXStdlibType() const319 ToolChain::CXXStdlibType Linux::GetDefaultCXXStdlibType() const {
320 if (getTriple().isAndroid())
321 return ToolChain::CST_Libcxx;
322 return ToolChain::CST_Libstdcxx;
323 }
324
HasNativeLLVMSupport() const325 bool Linux::HasNativeLLVMSupport() const { return true; }
326
buildLinker() const327 Tool *Linux::buildLinker() const { return new tools::gnutools::Linker(*this); }
328
buildStaticLibTool() const329 Tool *Linux::buildStaticLibTool() const {
330 return new tools::gnutools::StaticLibTool(*this);
331 }
332
buildAssembler() const333 Tool *Linux::buildAssembler() const {
334 return new tools::gnutools::Assembler(*this);
335 }
336
computeSysRoot() const337 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
getDynamicLinker(const ArgList & Args) const376 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
AddClangSystemIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const532 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
addLibStdCxxIncludePaths(const llvm::opt::ArgList & DriverArgs,llvm::opt::ArgStringList & CC1Args) const593 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
AddCudaIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const634 void Linux::AddCudaIncludeArgs(const ArgList &DriverArgs,
635 ArgStringList &CC1Args) const {
636 CudaInstallation.AddCudaIncludeArgs(DriverArgs, CC1Args);
637 }
638
AddHIPIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const639 void Linux::AddHIPIncludeArgs(const ArgList &DriverArgs,
640 ArgStringList &CC1Args) const {
641 RocmInstallation.AddHIPIncludeArgs(DriverArgs, CC1Args);
642 }
643
AddIAMCUIncludeArgs(const ArgList & DriverArgs,ArgStringList & CC1Args) const644 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
isPIEDefault() const654 bool Linux::isPIEDefault() const {
655 return (getTriple().isAndroid() && !getTriple().isAndroidVersionLT(16)) ||
656 getTriple().isMusl() || getSanitizerArgs().requiresPIE();
657 }
658
IsAArch64OutlineAtomicsDefault(const ArgList & Args) const659 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
isNoExecStackDefault() const672 bool Linux::isNoExecStackDefault() const {
673 return getTriple().isAndroid();
674 }
675
IsMathErrnoDefault() const676 bool Linux::IsMathErrnoDefault() const {
677 if (getTriple().isAndroid())
678 return false;
679 return Generic_ELF::IsMathErrnoDefault();
680 }
681
getSupportedSanitizers() const682 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
addProfileRTLibs(const llvm::opt::ArgList & Args,llvm::opt::ArgStringList & CmdArgs) const728 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
getDefaultDenormalModeForType(const llvm::opt::ArgList & DriverArgs,const JobAction & JA,const llvm::fltSemantics * FPType) const739 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
addExtraOpts(llvm::opt::ArgStringList & CmdArgs) const757 void Linux::addExtraOpts(llvm::opt::ArgStringList &CmdArgs) const {
758 for (const auto &Opt : ExtraOpts)
759 CmdArgs.push_back(Opt.c_str());
760 }
761