1	//===--- Gnu.cpp - Gnu Tool and 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 "Gnu.h"
10	#include "Arch/ARM.h"
11	#include "Arch/CSKY.h"
12	#include "Arch/LoongArch.h"
13	#include "Arch/Mips.h"
14	#include "Arch/PPC.h"
15	#include "Arch/RISCV.h"
16	#include "Arch/Sparc.h"
17	#include "Arch/SystemZ.h"
18	#include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
19	#include "clang/Driver/CommonArgs.h"
20	#include "clang/Driver/Compilation.h"
21	#include "clang/Driver/Driver.h"
22	#include "clang/Driver/MultilibBuilder.h"
23	#include "clang/Driver/Options.h"
24	#include "clang/Driver/Tool.h"
25	#include "clang/Driver/ToolChain.h"
26	#include "llvm/ADT/StringSet.h"
27	#include "llvm/ADT/Twine.h"
28	#include "llvm/Option/ArgList.h"
29	#include "llvm/Support/CodeGen.h"
30	#include "llvm/Support/Path.h"
31	#include "llvm/Support/VirtualFileSystem.h"
32	#include "llvm/TargetParser/RISCVISAInfo.h"
33	#include "llvm/TargetParser/TargetParser.h"
34	#include <system_error>
35
36	using namespace clang::driver;
37	using namespace clang::driver::toolchains;
38	using namespace clang;
39	using namespace llvm::opt;
40
41	using tools::addMultilibFlag;
42	using tools::addPathIfExists;
43
44	static bool forwardToGCC(const Option &O) {
45	// LinkerInput options have been forwarded. Don't duplicate.
46	if (O.hasFlag(Val: options::LinkerInput))
47	return false;
48	return O.matches(options::ID: OPT_Link_Group) || O.hasFlag(Val: options::LinkOption);
49	}
50
51	// Switch CPU names not recognized by GNU assembler to a close CPU that it does
52	// recognize, instead of a lower march from being picked in the absence of a cpu
53	// flag.
54	static void normalizeCPUNamesForAssembler(const ArgList &Args,
55	ArgStringList &CmdArgs) {
56	if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
57	StringRef CPUArg(A->getValue());
58	if (CPUArg.equals_insensitive(RHS: "krait"))
59	CmdArgs.push_back(Elt: "-mcpu=cortex-a15");
60	else if (CPUArg.equals_insensitive(RHS: "kryo"))
61	CmdArgs.push_back(Elt: "-mcpu=cortex-a57");
62	else
63	Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
64	}
65	}
66
67	void tools::gcc::Common::ConstructJob(Compilation &C, const JobAction &JA,
68	const InputInfo &Output,
69	const InputInfoList &Inputs,
70	const ArgList &Args,
71	const char *LinkingOutput) const {
72	const Driver &D = getToolChain().getDriver();
73	ArgStringList CmdArgs;
74
75	for (const auto &A : Args) {
76	if (forwardToGCC(O: A->getOption())) {
77	// It is unfortunate that we have to claim here, as this means
78	// we will basically never report anything interesting for
79	// platforms using a generic gcc, even if we are just using gcc
80	// to get to the assembler.
81	A->claim();
82
83	A->render(Args, Output&: CmdArgs);
84	}
85	}
86
87	RenderExtraToolArgs(JA, CmdArgs);
88
89	// If using a driver, force the arch.
90	if (getToolChain().getTriple().isOSDarwin()) {
91	CmdArgs.push_back(Elt: "-arch");
92	CmdArgs.push_back(
93	Elt: Args.MakeArgString(Str: getToolChain().getDefaultUniversalArchName()));
94	}
95
96	// Try to force gcc to match the tool chain we want, if we recognize
97	// the arch.
98	//
99	// FIXME: The triple class should directly provide the information we want
100	// here.
101	switch (getToolChain().getArch()) {
102	default:
103	break;
104	case llvm::Triple::x86:
105	case llvm::Triple::ppc:
106	case llvm::Triple::ppcle:
107	CmdArgs.push_back(Elt: "-m32");
108	break;
109	case llvm::Triple::x86_64:
110	case llvm::Triple::ppc64:
111	case llvm::Triple::ppc64le:
112	CmdArgs.push_back(Elt: "-m64");
113	break;
114	case llvm::Triple::sparcel:
115	CmdArgs.push_back(Elt: "-EL");
116	break;
117	}
118
119	assert((Output.isFilename() || Output.isNothing()) && "Invalid output.");
120	if (Output.isFilename()) {
121	CmdArgs.push_back(Elt: "-o");
122	CmdArgs.push_back(Elt: Output.getFilename());
123	} else {
124	CmdArgs.push_back(Elt: "-fsyntax-only");
125	}
126
127	Args.AddAllArgValues(Output&: CmdArgs, options::Id0: OPT_Wa_COMMA, options::Id1: OPT_Xassembler);
128
129	// Only pass -x if gcc will understand it; otherwise hope gcc
130	// understands the suffix correctly. The main use case this would go
131	// wrong in is for linker inputs if they happened to have an odd
132	// suffix; really the only way to get this to happen is a command
133	// like '-x foobar a.c' which will treat a.c like a linker input.
134	//
135	// FIXME: For the linker case specifically, can we safely convert
136	// inputs into '-Wl,' options?
137	for (const auto &II : Inputs) {
138	// Don't try to pass LLVM or AST inputs to a generic gcc.
139	if (types::isLLVMIR(Id: II.getType()))
140	D.Diag(clang::diag::DiagID: err_drv_no_linker_llvm_support)
141	<< getToolChain().getTripleString();
142	else if (II.getType() == types::TY_AST)
143	D.Diag(diag::DiagID: err_drv_no_ast_support) << getToolChain().getTripleString();
144	else if (II.getType() == types::TY_ModuleFile)
145	D.Diag(diag::DiagID: err_drv_no_module_support)
146	<< getToolChain().getTripleString();
147
148	if (types::canTypeBeUserSpecified(Id: II.getType())) {
149	CmdArgs.push_back(Elt: "-x");
150	CmdArgs.push_back(Elt: types::getTypeName(Id: II.getType()));
151	}
152
153	if (II.isFilename())
154	CmdArgs.push_back(Elt: II.getFilename());
155	else {
156	const Arg &A = II.getInputArg();
157
158	// Reverse translate some rewritten options.
159	if (A.getOption().matches(options::ID: OPT_Z_reserved_lib_stdcxx)) {
160	CmdArgs.push_back(Elt: "-lstdc++");
161	continue;
162	}
163
164	// Don't render as input, we need gcc to do the translations.
165	A.render(Args, Output&: CmdArgs);
166	}
167	}
168
169	const std::string &customGCCName = D.getCCCGenericGCCName();
170	const char *GCCName;
171	if (!customGCCName.empty())
172	GCCName = customGCCName.c_str();
173	else if (D.CCCIsCXX()) {
174	GCCName = "g++";
175	} else
176	GCCName = "gcc";
177
178	const char *Exec = Args.MakeArgString(Str: getToolChain().GetProgramPath(Name: GCCName));
179	C.addCommand(C: std::make_unique<Command>(args: JA, args: *this,
180	args: ResponseFileSupport::AtFileCurCP(),
181	args&: Exec, args&: CmdArgs, args: Inputs, args: Output));
182	}
183
184	void tools::gcc::Preprocessor::RenderExtraToolArgs(
185	const JobAction &JA, ArgStringList &CmdArgs) const {
186	CmdArgs.push_back(Elt: "-E");
187	}
188
189	void tools::gcc::Compiler::RenderExtraToolArgs(const JobAction &JA,
190	ArgStringList &CmdArgs) const {
191	const Driver &D = getToolChain().getDriver();
192
193	switch (JA.getType()) {
194	// If -flto, etc. are present then make sure not to force assembly output.
195	case types::TY_LLVM_IR:
196	case types::TY_LTO_IR:
197	case types::TY_LLVM_BC:
198	case types::TY_LTO_BC:
199	CmdArgs.push_back(Elt: "-c");
200	break;
201	// We assume we've got an "integrated" assembler in that gcc will produce an
202	// object file itself.
203	case types::TY_Object:
204	CmdArgs.push_back(Elt: "-c");
205	break;
206	case types::TY_PP_Asm:
207	CmdArgs.push_back(Elt: "-S");
208	break;
209	case types::TY_Nothing:
210	CmdArgs.push_back(Elt: "-fsyntax-only");
211	break;
212	default:
213	D.Diag(diag::DiagID: err_drv_invalid_gcc_output_type) << getTypeName(Id: JA.getType());
214	}
215	}
216
217	void tools::gcc::Linker::RenderExtraToolArgs(const JobAction &JA,
218	ArgStringList &CmdArgs) const {
219	// The types are (hopefully) good enough.
220	}
221
222	static const char *getLDMOption(const llvm::Triple &T, const ArgList &Args) {
223	switch (T.getArch()) {
224	case llvm::Triple::x86:
225	if (T.isOSIAMCU())
226	return "elf_iamcu";
227	return "elf_i386";
228	case llvm::Triple::aarch64:
229	return "aarch64linux";
230	case llvm::Triple::aarch64_be:
231	return "aarch64linuxb";
232	case llvm::Triple::arm:
233	case llvm::Triple::thumb:
234	case llvm::Triple::armeb:
235	case llvm::Triple::thumbeb:
236	return tools::arm::isARMBigEndian(Triple: T, Args) ? "armelfb_linux_eabi"
237	: "armelf_linux_eabi";
238	case llvm::Triple::m68k:
239	return "m68kelf";
240	case llvm::Triple::ppc:
241	if (T.isOSLinux())
242	return "elf32ppclinux";
243	return "elf32ppc";
244	case llvm::Triple::ppcle:
245	if (T.isOSLinux())
246	return "elf32lppclinux";
247	return "elf32lppc";
248	case llvm::Triple::ppc64:
249	return "elf64ppc";
250	case llvm::Triple::ppc64le:
251	return "elf64lppc";
252	case llvm::Triple::riscv32:
253	return "elf32lriscv";
254	case llvm::Triple::riscv64:
255	return "elf64lriscv";
256	case llvm::Triple::sparc:
257	case llvm::Triple::sparcel:
258	return "elf32_sparc";
259	case llvm::Triple::sparcv9:
260	return "elf64_sparc";
261	case llvm::Triple::loongarch32:
262	return "elf32loongarch";
263	case llvm::Triple::loongarch64:
264	return "elf64loongarch";
265	case llvm::Triple::mips:
266	return "elf32btsmip";
267	case llvm::Triple::mipsel:
268	return "elf32ltsmip";
269	case llvm::Triple::mips64:
270	if (tools::mips::hasMipsAbiArg(Args, Value: "n32") || T.isABIN32())
271	return "elf32btsmipn32";
272	return "elf64btsmip";
273	case llvm::Triple::mips64el:
274	if (tools::mips::hasMipsAbiArg(Args, Value: "n32") || T.isABIN32())
275	return "elf32ltsmipn32";
276	return "elf64ltsmip";
277	case llvm::Triple::systemz:
278	return "elf64_s390";
279	case llvm::Triple::x86_64:
280	if (T.isX32())
281	return "elf32_x86_64";
282	return "elf_x86_64";
283	case llvm::Triple::ve:
284	return "elf64ve";
285	case llvm::Triple::csky:
286	return "cskyelf_linux";
287	default:
288	return nullptr;
289	}
290	}
291
292	static bool getStaticPIE(const ArgList &Args, const ToolChain &TC) {
293	bool HasStaticPIE = Args.hasArg(options::OPT_static_pie);
294	if (HasStaticPIE && Args.hasArg(options::OPT_no_pie)) {
295	const Driver &D = TC.getDriver();
296	const llvm::opt::OptTable &Opts = D.getOpts();
297	StringRef StaticPIEName = Opts.getOptionName(options::id: OPT_static_pie);
298	StringRef NoPIEName = Opts.getOptionName(options::id: OPT_nopie);
299	D.Diag(diag::DiagID: err_drv_cannot_mix_options) << StaticPIEName << NoPIEName;
300	}
301	return HasStaticPIE;
302	}
303
304	static bool getStatic(const ArgList &Args) {
305	return Args.hasArg(options::OPT_static) &&
306	!Args.hasArg(options::OPT_static_pie);
307	}
308
309	void tools::gnutools::StaticLibTool::ConstructJob(
310	Compilation &C, const JobAction &JA, const InputInfo &Output,
311	const InputInfoList &Inputs, const ArgList &Args,
312	const char *LinkingOutput) const {
313	const Driver &D = getToolChain().getDriver();
314
315	// Silence warning for "clang -g foo.o -o foo"
316	Args.ClaimAllArgs(options::OPT_g_Group);
317	// and "clang -emit-llvm foo.o -o foo"
318	Args.ClaimAllArgs(options::OPT_emit_llvm);
319	// and for "clang -w foo.o -o foo". Other warning options are already
320	// handled somewhere else.
321	Args.ClaimAllArgs(options::OPT_w);
322	// Silence warnings when linking C code with a C++ '-stdlib' argument.
323	Args.ClaimAllArgs(options::OPT_stdlib_EQ);
324
325	// ar tool command "llvm-ar <options> <output_file> <input_files>".
326	ArgStringList CmdArgs;
327	// Create and insert file members with a deterministic index.
328	CmdArgs.push_back(Elt: "rcsD");
329	CmdArgs.push_back(Elt: Output.getFilename());
330
331	for (const auto &II : Inputs) {
332	if (II.isFilename()) {
333	CmdArgs.push_back(Elt: II.getFilename());
334	}
335	}
336
337	// Delete old output archive file if it already exists before generating a new
338	// archive file.
339	auto OutputFileName = Output.getFilename();
340	if (Output.isFilename() && llvm::sys::fs::exists(Path: OutputFileName)) {
341	if (std::error_code EC = llvm::sys::fs::remove(path: OutputFileName)) {
342	D.Diag(diag::DiagID: err_drv_unable_to_remove_file) << EC.message();
343	return;
344	}
345	}
346
347	const char *Exec = Args.MakeArgString(Str: getToolChain().GetStaticLibToolPath());
348	C.addCommand(C: std::make_unique<Command>(args: JA, args: *this,
349	args: ResponseFileSupport::AtFileCurCP(),
350	args&: Exec, args&: CmdArgs, args: Inputs, args: Output));
351	}
352
353	void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
354	const InputInfo &Output,
355	const InputInfoList &Inputs,
356	const ArgList &Args,
357	const char *LinkingOutput) const {
358	// FIXME: The Linker class constructor takes a ToolChain and not a
359	// Generic_ELF, so the static_cast might return a reference to a invalid
360	// instance (see PR45061). Ideally, the Linker constructor needs to take a
361	// Generic_ELF instead.
362	const auto &ToolChain = static_cast<const Generic_ELF &>(getToolChain());
363	const Driver &D = ToolChain.getDriver();
364
365	const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
366
367	const llvm::Triple::ArchType Arch = ToolChain.getArch();
368	const bool isOHOSFamily = ToolChain.getTriple().isOHOSFamily();
369	const bool isAndroid = ToolChain.getTriple().isAndroid();
370	const bool IsIAMCU = ToolChain.getTriple().isOSIAMCU();
371	const bool IsVE = ToolChain.getTriple().isVE();
372	const bool IsStaticPIE = getStaticPIE(Args, TC: ToolChain);
373	const bool IsStatic = getStatic(Args);
374	const bool HasCRTBeginEndFiles =
375	ToolChain.getTriple().hasEnvironment() ||
376	(ToolChain.getTriple().getVendor() != llvm::Triple::MipsTechnologies);
377
378	ArgStringList CmdArgs;
379
380	// Silence warning for "clang -g foo.o -o foo"
381	Args.ClaimAllArgs(options::OPT_g_Group);
382	// and "clang -emit-llvm foo.o -o foo"
383	Args.ClaimAllArgs(options::OPT_emit_llvm);
384	// and for "clang -w foo.o -o foo". Other warning options are already
385	// handled somewhere else.
386	Args.ClaimAllArgs(options::OPT_w);
387
388	if (!D.SysRoot.empty())
389	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "--sysroot=" + D.SysRoot));
390
391	if (Args.hasArg(options::OPT_s))
392	CmdArgs.push_back(Elt: "-s");
393
394	if (Triple.isARM() || Triple.isThumb()) {
395	bool IsBigEndian = arm::isARMBigEndian(Triple, Args);
396	if (IsBigEndian)
397	arm::appendBE8LinkFlag(Args, CmdArgs, Triple);
398	CmdArgs.push_back(Elt: IsBigEndian ? "-EB" : "-EL");
399	} else if (Triple.isAArch64()) {
400	CmdArgs.push_back(Elt: Arch == llvm::Triple::aarch64_be ? "-EB" : "-EL");
401	}
402
403	// Most Android ARM64 targets should enable the linker fix for erratum
404	// 843419. Only non-Cortex-A53 devices are allowed to skip this flag.
405	if (Arch == llvm::Triple::aarch64 && (isAndroid || isOHOSFamily)) {
406	std::string CPU = getCPUName(D, Args, T: Triple);
407	if (CPU.empty() || CPU == "generic" || CPU == "cortex-a53")
408	CmdArgs.push_back(Elt: "--fix-cortex-a53-843419");
409	}
410
411	ToolChain.addExtraOpts(CmdArgs);
412
413	CmdArgs.push_back(Elt: "--eh-frame-hdr");
414
415	if (const char *LDMOption = getLDMOption(T: ToolChain.getTriple(), Args)) {
416	CmdArgs.push_back(Elt: "-m");
417	CmdArgs.push_back(Elt: LDMOption);
418	} else {
419	D.Diag(diag::DiagID: err_target_unknown_triple) << Triple.str();
420	return;
421	}
422
423	if (Triple.isLoongArch() || Triple.isRISCV()) {
424	CmdArgs.push_back(Elt: "-X");
425	if (Args.hasArg(options::OPT_mno_relax))
426	CmdArgs.push_back(Elt: "--no-relax");
427	}
428
429	const bool IsShared = Args.hasArg(options::OPT_shared);
430	if (IsShared)
431	CmdArgs.push_back(Elt: "-shared");
432	bool IsPIE = false;
433	if (IsStaticPIE) {
434	CmdArgs.push_back(Elt: "-static");
435	CmdArgs.push_back(Elt: "-pie");
436	CmdArgs.push_back(Elt: "--no-dynamic-linker");
437	CmdArgs.push_back(Elt: "-z");
438	CmdArgs.push_back(Elt: "text");
439	} else if (IsStatic) {
440	CmdArgs.push_back(Elt: "-static");
441	} else if (!Args.hasArg(options::OPT_r)) {
442	if (Args.hasArg(options::OPT_rdynamic))
443	CmdArgs.push_back(Elt: "-export-dynamic");
444	if (!IsShared) {
445	IsPIE = Args.hasFlag(options::OPT_pie, options::OPT_no_pie,
446	ToolChain.isPIEDefault(Args));
447	if (IsPIE)
448	CmdArgs.push_back(Elt: "-pie");
449	CmdArgs.push_back(Elt: "-dynamic-linker");
450	CmdArgs.push_back(Elt: Args.MakeArgString(Str: Twine(D.DyldPrefix) +
451	ToolChain.getDynamicLinker(Args)));
452	}
453	}
454
455	CmdArgs.push_back(Elt: "-o");
456	CmdArgs.push_back(Elt: Output.getFilename());
457
458	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles,
459	options::OPT_r)) {
460	if (!isAndroid && !IsIAMCU) {
461	const char *crt1 = nullptr;
462	if (!Args.hasArg(options::OPT_shared)) {
463	if (Args.hasArg(options::OPT_pg))
464	crt1 = "gcrt1.o";
465	else if (IsPIE)
466	crt1 = "Scrt1.o";
467	else if (IsStaticPIE)
468	crt1 = "rcrt1.o";
469	else
470	crt1 = "crt1.o";
471	}
472	if (crt1)
473	CmdArgs.push_back(Elt: Args.MakeArgString(Str: ToolChain.GetFilePath(Name: crt1)));
474
475	CmdArgs.push_back(Elt: Args.MakeArgString(Str: ToolChain.GetFilePath(Name: "crti.o")));
476	}
477
478	if (IsVE) {
479	CmdArgs.push_back(Elt: "-z");
480	CmdArgs.push_back(Elt: "max-page-size=0x4000000");
481	}
482
483	if (IsIAMCU)
484	CmdArgs.push_back(Elt: Args.MakeArgString(Str: ToolChain.GetFilePath(Name: "crt0.o")));
485	else if (HasCRTBeginEndFiles) {
486	std::string P;
487	if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
488	!isAndroid) {
489	std::string crtbegin = ToolChain.getCompilerRT(Args, Component: "crtbegin",
490	Type: ToolChain::FT_Object);
491	if (ToolChain.getVFS().exists(Path: crtbegin))
492	P = crtbegin;
493	}
494	if (P.empty()) {
495	const char *crtbegin;
496	if (Args.hasArg(options::OPT_shared))
497	crtbegin = isAndroid ? "crtbegin_so.o" : "crtbeginS.o";
498	else if (IsStatic)
499	crtbegin = isAndroid ? "crtbegin_static.o" : "crtbeginT.o";
500	else if (IsPIE || IsStaticPIE)
501	crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbeginS.o";
502	else
503	crtbegin = isAndroid ? "crtbegin_dynamic.o" : "crtbegin.o";
504	P = ToolChain.GetFilePath(Name: crtbegin);
505	}
506	CmdArgs.push_back(Elt: Args.MakeArgString(Str: P));
507	}
508
509	// Add crtfastmath.o if available and fast math is enabled.
510	ToolChain.addFastMathRuntimeIfAvailable(Args, CmdArgs);
511
512	if (isAndroid && Args.hasFlag(options::OPT_fandroid_pad_segment,
513	options::OPT_fno_android_pad_segment, false))
514	CmdArgs.push_back(
515	Elt: Args.MakeArgString(Str: ToolChain.GetFilePath(Name: "crt_pad_segment.o")));
516	}
517
518	Args.addAllArgs(CmdArgs, {options::OPT_L, options::OPT_u});
519
520	ToolChain.AddFilePathLibArgs(Args, CmdArgs);
521
522	if (D.isUsingLTO())
523	addLTOOptions(ToolChain, Args, CmdArgs, Output, Inputs,
524	IsThinLTO: D.getLTOMode() == LTOK_Thin);
525
526	if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
527	CmdArgs.push_back(Elt: "--no-demangle");
528
529	bool NeedsSanitizerDeps = addSanitizerRuntimes(TC: ToolChain, Args, CmdArgs);
530	bool NeedsXRayDeps = addXRayRuntime(TC: ToolChain, Args, CmdArgs);
531	addLinkerCompressDebugSectionsOption(TC: ToolChain, Args, CmdArgs);
532	AddLinkerInputs(TC: ToolChain, Inputs, Args, CmdArgs, JA);
533
534	addHIPRuntimeLibArgs(TC: ToolChain, C, Args, CmdArgs);
535
536	// The profile runtime also needs access to system libraries.
537	getToolChain().addProfileRTLibs(Args, CmdArgs);
538
539	if (D.CCCIsCXX() &&
540	!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs,
541	options::OPT_r)) {
542	if (ToolChain.ShouldLinkCXXStdlib(Args)) {
543	bool OnlyLibstdcxxStatic = Args.hasArg(options::OPT_static_libstdcxx) &&
544	!Args.hasArg(options::OPT_static);
545	if (OnlyLibstdcxxStatic)
546	CmdArgs.push_back(Elt: "-Bstatic");
547	ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
548	if (OnlyLibstdcxxStatic)
549	CmdArgs.push_back(Elt: "-Bdynamic");
550	}
551	CmdArgs.push_back(Elt: "-lm");
552	}
553
554	// Silence warnings when linking C code with a C++ '-stdlib' argument.
555	Args.ClaimAllArgs(options::OPT_stdlib_EQ);
556
557	// Additional linker set-up and flags for Fortran. This is required in order
558	// to generate executables. As Fortran runtime depends on the C runtime,
559	// these dependencies need to be listed before the C runtime below (i.e.
560	// AddRunTimeLibs).
561	if (D.IsFlangMode() &&
562	!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
563	ToolChain.addFortranRuntimeLibraryPath(Args, CmdArgs);
564	ToolChain.addFortranRuntimeLibs(Args, CmdArgs);
565	CmdArgs.push_back(Elt: "-lm");
566	}
567
568	if (!Args.hasArg(options::OPT_nostdlib, options::OPT_r)) {
569	if (!Args.hasArg(options::OPT_nodefaultlibs)) {
570	if (IsStatic || IsStaticPIE)
571	CmdArgs.push_back(Elt: "--start-group");
572
573	if (NeedsSanitizerDeps)
574	linkSanitizerRuntimeDeps(TC: ToolChain, Args, CmdArgs);
575
576	if (NeedsXRayDeps)
577	linkXRayRuntimeDeps(TC: ToolChain, Args, CmdArgs);
578
579	bool WantPthread = Args.hasArg(options::OPT_pthread) ||
580	Args.hasArg(options::OPT_pthreads);
581
582	// Use the static OpenMP runtime with -static-openmp
583	bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) &&
584	!Args.hasArg(options::OPT_static);
585
586	// FIXME: Only pass GompNeedsRT = true for platforms with libgomp that
587	// require librt. Most modern Linux platforms do, but some may not.
588	if (addOpenMPRuntime(C, CmdArgs, TC: ToolChain, Args, ForceStaticHostRuntime: StaticOpenMP,
589	IsOffloadingHost: JA.isHostOffloading(OKind: Action::OFK_OpenMP),
590	/* GompNeedsRT= */ true))
591	// OpenMP runtimes implies pthreads when using the GNU toolchain.
592	// FIXME: Does this really make sense for all GNU toolchains?
593	WantPthread = true;
594
595	AddRunTimeLibs(TC: ToolChain, D, CmdArgs, Args);
596
597	// LLVM support for atomics on 32-bit SPARC V8+ is incomplete, so
598	// forcibly link with libatomic as a workaround.
599	// TODO: Issue #41880 and D118021.
600	if (getToolChain().getTriple().getArch() == llvm::Triple::sparc) {
601	CmdArgs.push_back(Elt: "--push-state");
602	CmdArgs.push_back(Elt: "--as-needed");
603	CmdArgs.push_back(Elt: "-latomic");
604	CmdArgs.push_back(Elt: "--pop-state");
605	}
606
607	// We don't need libpthread neither for bionic (Android) nor for musl,
608	// (used by OHOS as runtime library).
609	if (WantPthread && !isAndroid && !isOHOSFamily)
610	CmdArgs.push_back(Elt: "-lpthread");
611
612	if (Args.hasArg(options::OPT_fsplit_stack))
613	CmdArgs.push_back(Elt: "--wrap=pthread_create");
614
615	if (!Args.hasArg(options::OPT_nolibc))
616	CmdArgs.push_back(Elt: "-lc");
617
618	// Add IAMCU specific libs, if needed.
619	if (IsIAMCU)
620	CmdArgs.push_back(Elt: "-lgloss");
621
622	if (IsStatic || IsStaticPIE)
623	CmdArgs.push_back(Elt: "--end-group");
624	else
625	AddRunTimeLibs(TC: ToolChain, D, CmdArgs, Args);
626
627	// Add IAMCU specific libs (outside the group), if needed.
628	if (IsIAMCU) {
629	CmdArgs.push_back(Elt: "--as-needed");
630	CmdArgs.push_back(Elt: "-lsoftfp");
631	CmdArgs.push_back(Elt: "--no-as-needed");
632	}
633	}
634
635	if (!Args.hasArg(options::OPT_nostartfiles) && !IsIAMCU) {
636	if (HasCRTBeginEndFiles) {
637	std::string P;
638	if (ToolChain.GetRuntimeLibType(Args) == ToolChain::RLT_CompilerRT &&
639	!isAndroid) {
640	std::string crtend = ToolChain.getCompilerRT(Args, Component: "crtend",
641	Type: ToolChain::FT_Object);
642	if (ToolChain.getVFS().exists(Path: crtend))
643	P = crtend;
644	}
645	if (P.empty()) {
646	const char *crtend;
647	if (Args.hasArg(options::OPT_shared))
648	crtend = isAndroid ? "crtend_so.o" : "crtendS.o";
649	else if (IsPIE || IsStaticPIE)
650	crtend = isAndroid ? "crtend_android.o" : "crtendS.o";
651	else
652	crtend = isAndroid ? "crtend_android.o" : "crtend.o";
653	P = ToolChain.GetFilePath(Name: crtend);
654	}
655	CmdArgs.push_back(Elt: Args.MakeArgString(Str: P));
656	}
657	if (!isAndroid)
658	CmdArgs.push_back(Elt: Args.MakeArgString(Str: ToolChain.GetFilePath(Name: "crtn.o")));
659	}
660	}
661
662	Args.addAllArgs(CmdArgs, {options::OPT_T, options::OPT_t});
663
664	const char *Exec = Args.MakeArgString(Str: ToolChain.GetLinkerPath());
665	C.addCommand(C: std::make_unique<Command>(args: JA, args: *this,
666	args: ResponseFileSupport::AtFileCurCP(),
667	args&: Exec, args&: CmdArgs, args: Inputs, args: Output));
668	}
669
670	void tools::gnutools::Assembler::ConstructJob(Compilation &C,
671	const JobAction &JA,
672	const InputInfo &Output,
673	const InputInfoList &Inputs,
674	const ArgList &Args,
675	const char *LinkingOutput) const {
676	const auto &D = getToolChain().getDriver();
677
678	claimNoWarnArgs(Args);
679
680	ArgStringList CmdArgs;
681
682	llvm::Reloc::Model RelocationModel;
683	unsigned PICLevel;
684	bool IsPIE;
685	const char *DefaultAssembler = "as";
686	// Enforce GNU as on Solaris; the native assembler's input syntax isn't fully
687	// compatible.
688	if (getToolChain().getTriple().isOSSolaris())
689	DefaultAssembler = "gas";
690	std::tie(args&: RelocationModel, args&: PICLevel, args&: IsPIE) =
691	ParsePICArgs(ToolChain: getToolChain(), Args);
692
693	if (const Arg *A = Args.getLastArg(options::OPT_gz, options::OPT_gz_EQ)) {
694	if (A->getOption().getID() == options::OPT_gz) {
695	CmdArgs.push_back(Elt: "--compress-debug-sections");
696	} else {
697	StringRef Value = A->getValue();
698	if (Value == "none" || Value == "zlib" || Value == "zstd") {
699	CmdArgs.push_back(
700	Elt: Args.MakeArgString(Str: "--compress-debug-sections=" + Twine(Value)));
701	} else {
702	D.Diag(diag::err_drv_unsupported_option_argument)
703	<< A->getSpelling() << Value;
704	}
705	}
706	}
707
708	switch (getToolChain().getArch()) {
709	default:
710	break;
711	// Add --32/--64 to make sure we get the format we want.
712	// This is incomplete
713	case llvm::Triple::x86:
714	CmdArgs.push_back(Elt: "--32");
715	break;
716	case llvm::Triple::x86_64:
717	if (getToolChain().getTriple().isX32())
718	CmdArgs.push_back(Elt: "--x32");
719	else
720	CmdArgs.push_back(Elt: "--64");
721	break;
722	case llvm::Triple::ppc: {
723	CmdArgs.push_back(Elt: "-a32");
724	CmdArgs.push_back(Elt: "-mppc");
725	CmdArgs.push_back(Elt: "-mbig-endian");
726	CmdArgs.push_back(Elt: ppc::getPPCAsmModeForCPU(
727	Name: getCPUName(D, Args, T: getToolChain().getTriple())));
728	break;
729	}
730	case llvm::Triple::ppcle: {
731	CmdArgs.push_back(Elt: "-a32");
732	CmdArgs.push_back(Elt: "-mppc");
733	CmdArgs.push_back(Elt: "-mlittle-endian");
734	CmdArgs.push_back(Elt: ppc::getPPCAsmModeForCPU(
735	Name: getCPUName(D, Args, T: getToolChain().getTriple())));
736	break;
737	}
738	case llvm::Triple::ppc64: {
739	CmdArgs.push_back(Elt: "-a64");
740	CmdArgs.push_back(Elt: "-mppc64");
741	CmdArgs.push_back(Elt: "-mbig-endian");
742	CmdArgs.push_back(Elt: ppc::getPPCAsmModeForCPU(
743	Name: getCPUName(D, Args, T: getToolChain().getTriple())));
744	break;
745	}
746	case llvm::Triple::ppc64le: {
747	CmdArgs.push_back(Elt: "-a64");
748	CmdArgs.push_back(Elt: "-mppc64");
749	CmdArgs.push_back(Elt: "-mlittle-endian");
750	CmdArgs.push_back(Elt: ppc::getPPCAsmModeForCPU(
751	Name: getCPUName(D, Args, T: getToolChain().getTriple())));
752	break;
753	}
754	case llvm::Triple::riscv32:
755	case llvm::Triple::riscv64: {
756	StringRef ABIName = riscv::getRISCVABI(Args, Triple: getToolChain().getTriple());
757	CmdArgs.push_back(Elt: "-mabi");
758	CmdArgs.push_back(Elt: ABIName.data());
759	std::string MArchName =
760	riscv::getRISCVArch(Args, Triple: getToolChain().getTriple());
761	CmdArgs.push_back(Elt: "-march");
762	CmdArgs.push_back(Elt: Args.MakeArgString(Str: MArchName));
763	if (!Args.hasFlag(options::OPT_mrelax, options::OPT_mno_relax, true))
764	Args.addOptOutFlag(CmdArgs, options::OPT_mrelax, options::OPT_mno_relax);
765	break;
766	}
767	case llvm::Triple::sparc:
768	case llvm::Triple::sparcel: {
769	CmdArgs.push_back(Elt: "-32");
770	std::string CPU = getCPUName(D, Args, T: getToolChain().getTriple());
771	CmdArgs.push_back(
772	Elt: sparc::getSparcAsmModeForCPU(Name: CPU, Triple: getToolChain().getTriple()));
773	AddAssemblerKPIC(ToolChain: getToolChain(), Args, CmdArgs);
774	break;
775	}
776	case llvm::Triple::sparcv9: {
777	CmdArgs.push_back(Elt: "-64");
778	std::string CPU = getCPUName(D, Args, T: getToolChain().getTriple());
779	CmdArgs.push_back(
780	Elt: sparc::getSparcAsmModeForCPU(Name: CPU, Triple: getToolChain().getTriple()));
781	AddAssemblerKPIC(ToolChain: getToolChain(), Args, CmdArgs);
782	break;
783	}
784	case llvm::Triple::arm:
785	case llvm::Triple::armeb:
786	case llvm::Triple::thumb:
787	case llvm::Triple::thumbeb: {
788	const llvm::Triple &Triple2 = getToolChain().getTriple();
789	CmdArgs.push_back(Elt: arm::isARMBigEndian(Triple: Triple2, Args) ? "-EB" : "-EL");
790	switch (Triple2.getSubArch()) {
791	case llvm::Triple::ARMSubArch_v7:
792	CmdArgs.push_back(Elt: "-mfpu=neon");
793	break;
794	case llvm::Triple::ARMSubArch_v8:
795	CmdArgs.push_back(Elt: "-mfpu=crypto-neon-fp-armv8");
796	break;
797	default:
798	break;
799	}
800
801	switch (arm::getARMFloatABI(TC: getToolChain(), Args)) {
802	case arm::FloatABI::Invalid: llvm_unreachable("must have an ABI!");
803	case arm::FloatABI::Soft:
804	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mfloat-abi=soft"));
805	break;
806	case arm::FloatABI::SoftFP:
807	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mfloat-abi=softfp"));
808	break;
809	case arm::FloatABI::Hard:
810	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mfloat-abi=hard"));
811	break;
812	}
813
814	Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
815	normalizeCPUNamesForAssembler(Args, CmdArgs);
816
817	Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
818	// The integrated assembler doesn't implement e_flags setting behavior for
819	// -meabi=gnu (gcc -mabi={apcs-gnu,atpcs} passes -meabi=gnu to gas). For
820	// compatibility we accept but warn.
821	if (Arg *A = Args.getLastArgNoClaim(options::OPT_mabi_EQ))
822	A->ignoreTargetSpecific();
823	break;
824	}
825	case llvm::Triple::aarch64:
826	case llvm::Triple::aarch64_be: {
827	CmdArgs.push_back(
828	Elt: getToolChain().getArch() == llvm::Triple::aarch64_be ? "-EB" : "-EL");
829	Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
830	normalizeCPUNamesForAssembler(Args, CmdArgs);
831
832	break;
833	}
834	// TODO: handle loongarch32.
835	case llvm::Triple::loongarch64: {
836	StringRef ABIName =
837	loongarch::getLoongArchABI(D, Args, Triple: getToolChain().getTriple());
838	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mabi=" + ABIName));
839	break;
840	}
841	case llvm::Triple::mips:
842	case llvm::Triple::mipsel:
843	case llvm::Triple::mips64:
844	case llvm::Triple::mips64el: {
845	StringRef CPUName;
846	StringRef ABIName;
847	mips::getMipsCPUAndABI(Args, Triple: getToolChain().getTriple(), CPUName, ABIName);
848	ABIName = mips::getGnuCompatibleMipsABIName(ABI: ABIName);
849
850	CmdArgs.push_back(Elt: "-march");
851	CmdArgs.push_back(Elt: CPUName.data());
852
853	CmdArgs.push_back(Elt: "-mabi");
854	CmdArgs.push_back(Elt: ABIName.data());
855
856	// -mno-shared should be emitted unless -fpic, -fpie, -fPIC, -fPIE,
857	// or -mshared (not implemented) is in effect.
858	if (RelocationModel == llvm::Reloc::Static)
859	CmdArgs.push_back(Elt: "-mno-shared");
860
861	// LLVM doesn't support -mplt yet and acts as if it is always given.
862	// However, -mplt has no effect with the N64 ABI.
863	if (ABIName != "64" && !Args.hasArg(options::OPT_mno_abicalls))
864	CmdArgs.push_back(Elt: "-call_nonpic");
865
866	if (getToolChain().getTriple().isLittleEndian())
867	CmdArgs.push_back(Elt: "-EL");
868	else
869	CmdArgs.push_back(Elt: "-EB");
870
871	if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
872	if (StringRef(A->getValue()) == "2008")
873	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mnan=2008"));
874	}
875
876	// Add the last -mfp32/-mfpxx/-mfp64 or -mfpxx if it is enabled by default.
877	if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
878	options::OPT_mfp64)) {
879	A->claim();
880	A->render(Args, Output&: CmdArgs);
881	} else if (mips::shouldUseFPXX(
882	Args, Triple: getToolChain().getTriple(), CPUName, ABIName,
883	FloatABI: mips::getMipsFloatABI(D: getToolChain().getDriver(), Args,
884	Triple: getToolChain().getTriple())))
885	CmdArgs.push_back(Elt: "-mfpxx");
886
887	// Pass on -mmips16 or -mno-mips16. However, the assembler equivalent of
888	// -mno-mips16 is actually -no-mips16.
889	if (Arg *A =
890	Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16)) {
891	if (A->getOption().matches(options::OPT_mips16)) {
892	A->claim();
893	A->render(Args, Output&: CmdArgs);
894	} else {
895	A->claim();
896	CmdArgs.push_back(Elt: "-no-mips16");
897	}
898	}
899
900	Args.AddLastArg(CmdArgs, options::OPT_mmicromips,
901	options::OPT_mno_micromips);
902	Args.AddLastArg(CmdArgs, options::OPT_mdsp, options::OPT_mno_dsp);
903	Args.AddLastArg(CmdArgs, options::OPT_mdspr2, options::OPT_mno_dspr2);
904
905	if (Arg *A = Args.getLastArg(options::OPT_mmsa, options::OPT_mno_msa)) {
906	// Do not use AddLastArg because not all versions of MIPS assembler
907	// support -mmsa / -mno-msa options.
908	if (A->getOption().matches(options::OPT_mmsa))
909	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-mmsa"));
910	}
911
912	Args.AddLastArg(CmdArgs, options::OPT_mhard_float,
913	options::OPT_msoft_float);
914
915	Args.AddLastArg(CmdArgs, options::OPT_mdouble_float,
916	options::OPT_msingle_float);
917
918	Args.AddLastArg(CmdArgs, options::OPT_modd_spreg,
919	options::OPT_mno_odd_spreg);
920
921	AddAssemblerKPIC(ToolChain: getToolChain(), Args, CmdArgs);
922	break;
923	}
924	case llvm::Triple::systemz: {
925	// Always pass an -march option, since our default of z10 is later
926	// than the GNU assembler's default.
927	std::string CPUName =
928	systemz::getSystemZTargetCPU(Args, T: getToolChain().getTriple());
929	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-march=" + CPUName));
930	break;
931	}
932	case llvm::Triple::ve:
933	DefaultAssembler = "nas";
934	}
935
936	for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
937	options::OPT_fdebug_prefix_map_EQ)) {
938	StringRef Map = A->getValue();
939	if (!Map.contains('='))
940	D.Diag(diag::err_drv_invalid_argument_to_option)
941	<< Map << A->getOption().getName();
942	else {
943	CmdArgs.push_back(Args.MakeArgString("--debug-prefix-map"));
944	CmdArgs.push_back(Args.MakeArgString(Map));
945	}
946	A->claim();
947	}
948
949	Args.AddAllArgs(CmdArgs, options::OPT_I);
950	Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
951
952	CmdArgs.push_back(Elt: "-o");
953	CmdArgs.push_back(Elt: Output.getFilename());
954
955	for (const auto &II : Inputs)
956	CmdArgs.push_back(Elt: II.getFilename());
957
958	if (Arg *A = Args.getLastArg(options::OPT_g_Flag, options::OPT_gN_Group,
959	options::OPT_gdwarf_2, options::OPT_gdwarf_3,
960	options::OPT_gdwarf_4, options::OPT_gdwarf_5,
961	options::OPT_gdwarf))
962	if (!A->getOption().matches(options::OPT_g0)) {
963	Args.AddLastArg(CmdArgs, options::OPT_g_Flag);
964
965	unsigned DwarfVersion = getDwarfVersion(TC: getToolChain(), Args);
966	CmdArgs.push_back(Elt: Args.MakeArgString(Str: "-gdwarf-" + Twine(DwarfVersion)));
967	}
968
969	const char *Exec =
970	Args.MakeArgString(Str: getToolChain().GetProgramPath(Name: DefaultAssembler));
971	C.addCommand(C: std::make_unique<Command>(args: JA, args: *this,
972	args: ResponseFileSupport::AtFileCurCP(),
973	args&: Exec, args&: CmdArgs, args: Inputs, args: Output));
974
975	// Handle the debug info splitting at object creation time if we're
976	// creating an object.
977	// TODO: Currently only works on linux with newer objcopy.
978	if (Args.hasArg(options::OPT_gsplit_dwarf) &&
979	getToolChain().getTriple().isOSLinux())
980	SplitDebugInfo(TC: getToolChain(), C, T: *this, JA, Args, Output,
981	OutFile: SplitDebugName(JA, Args, Input: Inputs[0], Output));
982	}
983
984	namespace {
985	// Filter to remove Multilibs that don't exist as a suffix to Path
986	class FilterNonExistent {
987	StringRef Base, File;
988	llvm::vfs::FileSystem &VFS;
989
990	public:
991	FilterNonExistent(StringRef Base, StringRef File, llvm::vfs::FileSystem &VFS)
992	: Base(Base), File(File), VFS(VFS) {}
993	bool operator()(const Multilib &M) {
994	return !VFS.exists(Path: Base + M.gccSuffix() + File);
995	}
996	};
997	} // end anonymous namespace
998
999	static bool isSoftFloatABI(const ArgList &Args) {
1000	Arg *A = Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
1001	options::OPT_mfloat_abi_EQ);
1002	if (!A)
1003	return false;
1004
1005	return A->getOption().matches(options::OPT_msoft_float) ||
1006	(A->getOption().matches(options::OPT_mfloat_abi_EQ) &&
1007	A->getValue() == StringRef("soft"));
1008	}
1009
1010	static bool isArmOrThumbArch(llvm::Triple::ArchType Arch) {
1011	return Arch == llvm::Triple::arm || Arch == llvm::Triple::thumb;
1012	}
1013
1014	static bool isMipsEL(llvm::Triple::ArchType Arch) {
1015	return Arch == llvm::Triple::mipsel || Arch == llvm::Triple::mips64el;
1016	}
1017
1018	static bool isMips16(const ArgList &Args) {
1019	Arg *A = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16);
1020	return A && A->getOption().matches(options::OPT_mips16);
1021	}
1022
1023	static bool isMicroMips(const ArgList &Args) {
1024	Arg *A = Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips);
1025	return A && A->getOption().matches(options::OPT_mmicromips);
1026	}
1027
1028	static bool isMSP430(llvm::Triple::ArchType Arch) {
1029	return Arch == llvm::Triple::msp430;
1030	}
1031
1032	static bool findMipsCsMultilibs(const Driver &D,
1033	const Multilib::flags_list &Flags,
1034	FilterNonExistent &NonExistent,
1035	DetectedMultilibs &Result) {
1036	// Check for Code Sourcery toolchain multilibs
1037	MultilibSet CSMipsMultilibs;
1038	{
1039	auto MArchMips16 = MultilibBuilder("/mips16").flag(Flag: "-m32").flag(Flag: "-mips16");
1040
1041	auto MArchMicroMips =
1042	MultilibBuilder("/micromips").flag(Flag: "-m32").flag(Flag: "-mmicromips");
1043
1044	auto MArchDefault = MultilibBuilder("")
1045	.flag(Flag: "-mips16", /*Disallow=*/true)
1046	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1047
1048	auto UCLibc = MultilibBuilder("/uclibc").flag(Flag: "-muclibc");
1049
1050	auto SoftFloat = MultilibBuilder("/soft-float").flag(Flag: "-msoft-float");
1051
1052	auto Nan2008 = MultilibBuilder("/nan2008").flag(Flag: "-mnan=2008");
1053
1054	auto DefaultFloat = MultilibBuilder("")
1055	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1056	.flag(Flag: "-mnan=2008", /*Disallow=*/true);
1057
1058	auto BigEndian =
1059	MultilibBuilder("").flag(Flag: "-EB").flag(Flag: "-EL", /*Disallow=*/true);
1060
1061	auto LittleEndian =
1062	MultilibBuilder("/el").flag(Flag: "-EL").flag(Flag: "-EB", /*Disallow=*/true);
1063
1064	// Note that this one's osSuffix is ""
1065	auto MAbi64 = MultilibBuilder("")
1066	.gccSuffix(S: "/64")
1067	.includeSuffix(S: "/64")
1068	.flag(Flag: "-mabi=n64")
1069	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1070	.flag(Flag: "-m32", /*Disallow=*/true);
1071
1072	CSMipsMultilibs =
1073	MultilibSetBuilder()
1074	.Either(M1: MArchMips16, M2: MArchMicroMips, M3: MArchDefault)
1075	.Maybe(M: UCLibc)
1076	.Either(M1: SoftFloat, M2: Nan2008, M3: DefaultFloat)
1077	.FilterOut(Regex: "/micromips/nan2008")
1078	.FilterOut(Regex: "/mips16/nan2008")
1079	.Either(M1: BigEndian, M2: LittleEndian)
1080	.Maybe(M: MAbi64)
1081	.FilterOut(Regex: "/mips16.*/64")
1082	.FilterOut(Regex: "/micromips.*/64")
1083	.makeMultilibSet()
1084	.FilterOut(F: NonExistent)
1085	.setIncludeDirsCallback([](const Multilib &M) {
1086	std::vector<std::string> Dirs({"/include"});
1087	if (StringRef(M.includeSuffix()).starts_with(Prefix: "/uclibc"))
1088	Dirs.push_back(
1089	x: "/../../../../mips-linux-gnu/libc/uclibc/usr/include");
1090	else
1091	Dirs.push_back(x: "/../../../../mips-linux-gnu/libc/usr/include");
1092	return Dirs;
1093	});
1094	}
1095
1096	MultilibSet DebianMipsMultilibs;
1097	{
1098	MultilibBuilder MAbiN32 =
1099	MultilibBuilder().gccSuffix(S: "/n32").includeSuffix(S: "/n32").flag(
1100	Flag: "-mabi=n32");
1101
1102	MultilibBuilder M64 = MultilibBuilder()
1103	.gccSuffix(S: "/64")
1104	.includeSuffix(S: "/64")
1105	.flag(Flag: "-m64")
1106	.flag(Flag: "-m32", /*Disallow=*/true)
1107	.flag(Flag: "-mabi=n32", /*Disallow=*/true);
1108
1109	MultilibBuilder M32 = MultilibBuilder()
1110	.gccSuffix(S: "/32")
1111	.flag(Flag: "-m64", /*Disallow=*/true)
1112	.flag(Flag: "-m32")
1113	.flag(Flag: "-mabi=n32", /*Disallow=*/true);
1114
1115	DebianMipsMultilibs = MultilibSetBuilder()
1116	.Either(M1: M32, M2: M64, M3: MAbiN32)
1117	.makeMultilibSet()
1118	.FilterOut(F: NonExistent);
1119	}
1120
1121	// Sort candidates. Toolchain that best meets the directories tree goes first.
1122	// Then select the first toolchains matches command line flags.
1123	MultilibSet *Candidates[] = {&CSMipsMultilibs, &DebianMipsMultilibs};
1124	if (CSMipsMultilibs.size() < DebianMipsMultilibs.size())
1125	std::iter_swap(a: Candidates, b: Candidates + 1);
1126	for (const MultilibSet *Candidate : Candidates) {
1127	if (Candidate->select(D, Flags, Result.SelectedMultilibs)) {
1128	if (Candidate == &DebianMipsMultilibs)
1129	Result.BiarchSibling = Multilib();
1130	Result.Multilibs = *Candidate;
1131	return true;
1132	}
1133	}
1134	return false;
1135	}
1136
1137	static bool findMipsMuslMultilibs(const Driver &D,
1138	const Multilib::flags_list &Flags,
1139	FilterNonExistent &NonExistent,
1140	DetectedMultilibs &Result) {
1141	// Musl toolchain multilibs
1142	MultilibSet MuslMipsMultilibs;
1143	{
1144	auto MArchMipsR2 = MultilibBuilder("")
1145	.osSuffix(S: "/mips-r2-hard-musl")
1146	.flag(Flag: "-EB")
1147	.flag(Flag: "-EL", /*Disallow=*/true)
1148	.flag(Flag: "-march=mips32r2");
1149
1150	auto MArchMipselR2 = MultilibBuilder("/mipsel-r2-hard-musl")
1151	.flag(Flag: "-EB", /*Disallow=*/true)
1152	.flag(Flag: "-EL")
1153	.flag(Flag: "-march=mips32r2");
1154
1155	MuslMipsMultilibs = MultilibSetBuilder()
1156	.Either(M1: MArchMipsR2, M2: MArchMipselR2)
1157	.makeMultilibSet();
1158
1159	// Specify the callback that computes the include directories.
1160	MuslMipsMultilibs.setIncludeDirsCallback([](const Multilib &M) {
1161	return std::vector<std::string>(
1162	{"/../sysroot" + M.osSuffix() + "/usr/include"});
1163	});
1164	}
1165	if (MuslMipsMultilibs.select(D, Flags, Result.SelectedMultilibs)) {
1166	Result.Multilibs = MuslMipsMultilibs;
1167	return true;
1168	}
1169	return false;
1170	}
1171
1172	static bool findMipsMtiMultilibs(const Driver &D,
1173	const Multilib::flags_list &Flags,
1174	FilterNonExistent &NonExistent,
1175	DetectedMultilibs &Result) {
1176	// CodeScape MTI toolchain v1.2 and early.
1177	MultilibSet MtiMipsMultilibsV1;
1178	{
1179	auto MArchMips32 = MultilibBuilder("/mips32")
1180	.flag(Flag: "-m32")
1181	.flag(Flag: "-m64", /*Disallow=*/true)
1182	.flag(Flag: "-mmicromips", /*Disallow=*/true)
1183	.flag(Flag: "-march=mips32");
1184
1185	auto MArchMicroMips = MultilibBuilder("/micromips")
1186	.flag(Flag: "-m32")
1187	.flag(Flag: "-m64", /*Disallow=*/true)
1188	.flag(Flag: "-mmicromips");
1189
1190	auto MArchMips64r2 = MultilibBuilder("/mips64r2")
1191	.flag(Flag: "-m32", /*Disallow=*/true)
1192	.flag(Flag: "-m64")
1193	.flag(Flag: "-march=mips64r2");
1194
1195	auto MArchMips64 = MultilibBuilder("/mips64")
1196	.flag(Flag: "-m32", /*Disallow=*/true)
1197	.flag(Flag: "-m64")
1198	.flag(Flag: "-march=mips64r2", /*Disallow=*/true);
1199
1200	auto MArchDefault = MultilibBuilder("")
1201	.flag(Flag: "-m32")
1202	.flag(Flag: "-m64", /*Disallow=*/true)
1203	.flag(Flag: "-mmicromips", /*Disallow=*/true)
1204	.flag(Flag: "-march=mips32r2");
1205
1206	auto Mips16 = MultilibBuilder("/mips16").flag(Flag: "-mips16");
1207
1208	auto UCLibc = MultilibBuilder("/uclibc").flag(Flag: "-muclibc");
1209
1210	auto MAbi64 = MultilibBuilder("/64")
1211	.flag(Flag: "-mabi=n64")
1212	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1213	.flag(Flag: "-m32", /*Disallow=*/true);
1214
1215	auto BigEndian =
1216	MultilibBuilder("").flag(Flag: "-EB").flag(Flag: "-EL", /*Disallow=*/true);
1217
1218	auto LittleEndian =
1219	MultilibBuilder("/el").flag(Flag: "-EL").flag(Flag: "-EB", /*Disallow=*/true);
1220
1221	auto SoftFloat = MultilibBuilder("/sof").flag(Flag: "-msoft-float");
1222
1223	auto Nan2008 = MultilibBuilder("/nan2008").flag(Flag: "-mnan=2008");
1224
1225	MtiMipsMultilibsV1 =
1226	MultilibSetBuilder()
1227	.Either(M1: MArchMips32, M2: MArchMicroMips, M3: MArchMips64r2, M4: MArchMips64,
1228	M5: MArchDefault)
1229	.Maybe(M: UCLibc)
1230	.Maybe(M: Mips16)
1231	.FilterOut(Regex: "/mips64/mips16")
1232	.FilterOut(Regex: "/mips64r2/mips16")
1233	.FilterOut(Regex: "/micromips/mips16")
1234	.Maybe(M: MAbi64)
1235	.FilterOut(Regex: "/micromips/64")
1236	.FilterOut(Regex: "/mips32/64")
1237	.FilterOut(Regex: "^/64")
1238	.FilterOut(Regex: "/mips16/64")
1239	.Either(M1: BigEndian, M2: LittleEndian)
1240	.Maybe(M: SoftFloat)
1241	.Maybe(M: Nan2008)
1242	.FilterOut(Regex: ".*sof/nan2008")
1243	.makeMultilibSet()
1244	.FilterOut(F: NonExistent)
1245	.setIncludeDirsCallback([](const Multilib &M) {
1246	std::vector<std::string> Dirs({"/include"});
1247	if (StringRef(M.includeSuffix()).starts_with(Prefix: "/uclibc"))
1248	Dirs.push_back(x: "/../../../../sysroot/uclibc/usr/include");
1249	else
1250	Dirs.push_back(x: "/../../../../sysroot/usr/include");
1251	return Dirs;
1252	});
1253	}
1254
1255	// CodeScape IMG toolchain starting from v1.3.
1256	MultilibSet MtiMipsMultilibsV2;
1257	{
1258	auto BeHard = MultilibBuilder("/mips-r2-hard")
1259	.flag(Flag: "-EB")
1260	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1261	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1262	.flag(Flag: "-muclibc", /*Disallow=*/true);
1263	auto BeSoft = MultilibBuilder("/mips-r2-soft")
1264	.flag(Flag: "-EB")
1265	.flag(Flag: "-msoft-float")
1266	.flag(Flag: "-mnan=2008", /*Disallow=*/true);
1267	auto ElHard = MultilibBuilder("/mipsel-r2-hard")
1268	.flag(Flag: "-EL")
1269	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1270	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1271	.flag(Flag: "-muclibc", /*Disallow=*/true);
1272	auto ElSoft = MultilibBuilder("/mipsel-r2-soft")
1273	.flag(Flag: "-EL")
1274	.flag(Flag: "-msoft-float")
1275	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1276	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1277	auto BeHardNan = MultilibBuilder("/mips-r2-hard-nan2008")
1278	.flag(Flag: "-EB")
1279	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1280	.flag(Flag: "-mnan=2008")
1281	.flag(Flag: "-muclibc", /*Disallow=*/true);
1282	auto ElHardNan = MultilibBuilder("/mipsel-r2-hard-nan2008")
1283	.flag(Flag: "-EL")
1284	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1285	.flag(Flag: "-mnan=2008")
1286	.flag(Flag: "-muclibc", /*Disallow=*/true)
1287	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1288	auto BeHardNanUclibc = MultilibBuilder("/mips-r2-hard-nan2008-uclibc")
1289	.flag(Flag: "-EB")
1290	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1291	.flag(Flag: "-mnan=2008")
1292	.flag(Flag: "-muclibc");
1293	auto ElHardNanUclibc = MultilibBuilder("/mipsel-r2-hard-nan2008-uclibc")
1294	.flag(Flag: "-EL")
1295	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1296	.flag(Flag: "-mnan=2008")
1297	.flag(Flag: "-muclibc");
1298	auto BeHardUclibc = MultilibBuilder("/mips-r2-hard-uclibc")
1299	.flag(Flag: "-EB")
1300	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1301	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1302	.flag(Flag: "-muclibc");
1303	auto ElHardUclibc = MultilibBuilder("/mipsel-r2-hard-uclibc")
1304	.flag(Flag: "-EL")
1305	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1306	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1307	.flag(Flag: "-muclibc");
1308	auto ElMicroHardNan = MultilibBuilder("/micromipsel-r2-hard-nan2008")
1309	.flag(Flag: "-EL")
1310	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1311	.flag(Flag: "-mnan=2008")
1312	.flag(Flag: "-mmicromips");
1313	auto ElMicroSoft = MultilibBuilder("/micromipsel-r2-soft")
1314	.flag(Flag: "-EL")
1315	.flag(Flag: "-msoft-float")
1316	.flag(Flag: "-mnan=2008", /*Disallow=*/true)
1317	.flag(Flag: "-mmicromips");
1318
1319	auto O32 = MultilibBuilder("/lib")
1320	.osSuffix(S: "")
1321	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1322	.flag(Flag: "-mabi=n64", /*Disallow=*/true);
1323	auto N32 = MultilibBuilder("/lib32")
1324	.osSuffix(S: "")
1325	.flag(Flag: "-mabi=n32")
1326	.flag(Flag: "-mabi=n64", /*Disallow=*/true);
1327	auto N64 = MultilibBuilder("/lib64")
1328	.osSuffix(S: "")
1329	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1330	.flag(Flag: "-mabi=n64");
1331
1332	MtiMipsMultilibsV2 =
1333	MultilibSetBuilder()
1334	.Either(Ms: {BeHard, BeSoft, ElHard, ElSoft, BeHardNan, ElHardNan,
1335	BeHardNanUclibc, ElHardNanUclibc, BeHardUclibc,
1336	ElHardUclibc, ElMicroHardNan, ElMicroSoft})
1337	.Either(M1: O32, M2: N32, M3: N64)
1338	.makeMultilibSet()
1339	.FilterOut(F: NonExistent)
1340	.setIncludeDirsCallback([](const Multilib &M) {
1341	return std::vector<std::string>({"/../../../../sysroot" +
1342	M.includeSuffix() +
1343	"/../usr/include"});
1344	})
1345	.setFilePathsCallback([](const Multilib &M) {
1346	return std::vector<std::string>(
1347	{"/../../../../mips-mti-linux-gnu/lib" + M.gccSuffix()});
1348	});
1349	}
1350	for (auto *Candidate : {&MtiMipsMultilibsV1, &MtiMipsMultilibsV2}) {
1351	if (Candidate->select(D, Flags, Result.SelectedMultilibs)) {
1352	Result.Multilibs = *Candidate;
1353	return true;
1354	}
1355	}
1356	return false;
1357	}
1358
1359	static bool findMipsImgMultilibs(const Driver &D,
1360	const Multilib::flags_list &Flags,
1361	FilterNonExistent &NonExistent,
1362	DetectedMultilibs &Result) {
1363	// CodeScape IMG toolchain v1.2 and early.
1364	MultilibSet ImgMultilibsV1;
1365	{
1366	auto Mips64r6 = MultilibBuilder("/mips64r6")
1367	.flag(Flag: "-m64")
1368	.flag(Flag: "-m32", /*Disallow=*/true);
1369
1370	auto LittleEndian =
1371	MultilibBuilder("/el").flag(Flag: "-EL").flag(Flag: "-EB", /*Disallow=*/true);
1372
1373	auto MAbi64 = MultilibBuilder("/64")
1374	.flag(Flag: "-mabi=n64")
1375	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1376	.flag(Flag: "-m32", /*Disallow=*/true);
1377
1378	ImgMultilibsV1 =
1379	MultilibSetBuilder()
1380	.Maybe(M: Mips64r6)
1381	.Maybe(M: MAbi64)
1382	.Maybe(M: LittleEndian)
1383	.makeMultilibSet()
1384	.FilterOut(F: NonExistent)
1385	.setIncludeDirsCallback([](const Multilib &M) {
1386	return std::vector<std::string>(
1387	{"/include", "/../../../../sysroot/usr/include"});
1388	});
1389	}
1390
1391	// CodeScape IMG toolchain starting from v1.3.
1392	MultilibSet ImgMultilibsV2;
1393	{
1394	auto BeHard = MultilibBuilder("/mips-r6-hard")
1395	.flag(Flag: "-EB")
1396	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1397	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1398	auto BeSoft = MultilibBuilder("/mips-r6-soft")
1399	.flag(Flag: "-EB")
1400	.flag(Flag: "-msoft-float")
1401	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1402	auto ElHard = MultilibBuilder("/mipsel-r6-hard")
1403	.flag(Flag: "-EL")
1404	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1405	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1406	auto ElSoft = MultilibBuilder("/mipsel-r6-soft")
1407	.flag(Flag: "-EL")
1408	.flag(Flag: "-msoft-float")
1409	.flag(Flag: "-mmicromips", /*Disallow=*/true);
1410	auto BeMicroHard = MultilibBuilder("/micromips-r6-hard")
1411	.flag(Flag: "-EB")
1412	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1413	.flag(Flag: "-mmicromips");
1414	auto BeMicroSoft = MultilibBuilder("/micromips-r6-soft")
1415	.flag(Flag: "-EB")
1416	.flag(Flag: "-msoft-float")
1417	.flag(Flag: "-mmicromips");
1418	auto ElMicroHard = MultilibBuilder("/micromipsel-r6-hard")
1419	.flag(Flag: "-EL")
1420	.flag(Flag: "-msoft-float", /*Disallow=*/true)
1421	.flag(Flag: "-mmicromips");
1422	auto ElMicroSoft = MultilibBuilder("/micromipsel-r6-soft")
1423	.flag(Flag: "-EL")
1424	.flag(Flag: "-msoft-float")
1425	.flag(Flag: "-mmicromips");
1426
1427	auto O32 = MultilibBuilder("/lib")
1428	.osSuffix(S: "")
1429	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1430	.flag(Flag: "-mabi=n64", /*Disallow=*/true);
1431	auto N32 = MultilibBuilder("/lib32")
1432	.osSuffix(S: "")
1433	.flag(Flag: "-mabi=n32")
1434	.flag(Flag: "-mabi=n64", /*Disallow=*/true);
1435	auto N64 = MultilibBuilder("/lib64")
1436	.osSuffix(S: "")
1437	.flag(Flag: "-mabi=n32", /*Disallow=*/true)
1438	.flag(Flag: "-mabi=n64");
1439
1440	ImgMultilibsV2 =
1441	MultilibSetBuilder()
1442	.Either(Ms: {BeHard, BeSoft, ElHard, ElSoft, BeMicroHard, BeMicroSoft,
1443	ElMicroHard, ElMicroSoft})
1444	.Either(M1: O32, M2: N32, M3: N64)
1445	.makeMultilibSet()
1446	.FilterOut(F: NonExistent)
1447	.setIncludeDirsCallback([](const Multilib &M) {
1448	return std::vector<std::string>({"/../../../../sysroot" +
1449	M.includeSuffix() +
1450	"/../usr/include"});
1451	})
1452	.setFilePathsCallback([](const Multilib &M) {
1453	return std::vector<std::string>(
1454	{"/../../../../mips-img-linux-gnu/lib" + M.gccSuffix()});
1455	});
1456	}
1457	for (auto *Candidate : {&ImgMultilibsV1, &ImgMultilibsV2}) {
1458	if (Candidate->select(D, Flags, Result.SelectedMultilibs)) {
1459	Result.Multilibs = *Candidate;
1460	return true;
1461	}
1462	}
1463	return false;
1464	}
1465
1466	bool clang::driver::findMIPSMultilibs(const Driver &D,
1467	const llvm::Triple &TargetTriple,
1468	StringRef Path, const ArgList &Args,
1469	DetectedMultilibs &Result) {
1470	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1471
1472	StringRef CPUName;
1473	StringRef ABIName;
1474	tools::mips::getMipsCPUAndABI(Args, Triple: TargetTriple, CPUName, ABIName);
1475
1476	llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
1477
1478	Multilib::flags_list Flags;
1479	addMultilibFlag(Enabled: TargetTriple.isMIPS32(), Flag: "-m32", Flags);
1480	addMultilibFlag(Enabled: TargetTriple.isMIPS64(), Flag: "-m64", Flags);
1481	addMultilibFlag(Enabled: isMips16(Args), Flag: "-mips16", Flags);
1482	addMultilibFlag(Enabled: CPUName == "mips32", Flag: "-march=mips32", Flags);
1483	addMultilibFlag(Enabled: CPUName == "mips32r2" || CPUName == "mips32r3" ||
1484	CPUName == "mips32r5" || CPUName == "p5600",
1485	Flag: "-march=mips32r2", Flags);
1486	addMultilibFlag(Enabled: CPUName == "mips32r6", Flag: "-march=mips32r6", Flags);
1487	addMultilibFlag(Enabled: CPUName == "mips64", Flag: "-march=mips64", Flags);
1488	addMultilibFlag(Enabled: CPUName == "mips64r2" || CPUName == "mips64r3" ||
1489	CPUName == "mips64r5" || CPUName == "octeon" ||
1490	CPUName == "octeon+",
1491	Flag: "-march=mips64r2", Flags);
1492	addMultilibFlag(Enabled: CPUName == "mips64r6" || CPUName == "i6400" ||
1493	CPUName == "i6500",
1494	Flag: "-march=mips64r6", Flags);
1495	addMultilibFlag(Enabled: isMicroMips(Args), Flag: "-mmicromips", Flags);
1496	addMultilibFlag(Enabled: tools::mips::isUCLibc(Args), Flag: "-muclibc", Flags);
1497	addMultilibFlag(Enabled: tools::mips::isNaN2008(D, Args, Triple: TargetTriple), Flag: "-mnan=2008",
1498	Flags);
1499	addMultilibFlag(Enabled: ABIName == "n32", Flag: "-mabi=n32", Flags);
1500	addMultilibFlag(Enabled: ABIName == "n64", Flag: "-mabi=n64", Flags);
1501	addMultilibFlag(Enabled: isSoftFloatABI(Args), Flag: "-msoft-float", Flags);
1502	addMultilibFlag(Enabled: !isSoftFloatABI(Args), Flag: "-mhard-float", Flags);
1503	addMultilibFlag(Enabled: isMipsEL(Arch: TargetArch), Flag: "-EL", Flags);
1504	addMultilibFlag(Enabled: !isMipsEL(Arch: TargetArch), Flag: "-EB", Flags);
1505
1506	if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1507	TargetTriple.getOS() == llvm::Triple::Linux &&
1508	TargetTriple.getEnvironment() == llvm::Triple::UnknownEnvironment)
1509	return findMipsMuslMultilibs(D, Flags, NonExistent, Result);
1510
1511	if (TargetTriple.getVendor() == llvm::Triple::MipsTechnologies &&
1512	TargetTriple.getOS() == llvm::Triple::Linux &&
1513	TargetTriple.isGNUEnvironment())
1514	return findMipsMtiMultilibs(D, Flags, NonExistent, Result);
1515
1516	if (TargetTriple.getVendor() == llvm::Triple::ImaginationTechnologies &&
1517	TargetTriple.getOS() == llvm::Triple::Linux &&
1518	TargetTriple.isGNUEnvironment())
1519	return findMipsImgMultilibs(D, Flags, NonExistent, Result);
1520
1521	if (findMipsCsMultilibs(D, Flags, NonExistent, Result))
1522	return true;
1523
1524	// Fallback to the regular toolchain-tree structure.
1525	Multilib Default;
1526	Result.Multilibs.push_back(M: Default);
1527	Result.Multilibs.FilterOut(F: NonExistent);
1528
1529	if (Result.Multilibs.select(D, Flags, Result.SelectedMultilibs)) {
1530	Result.BiarchSibling = Multilib();
1531	return true;
1532	}
1533
1534	return false;
1535	}
1536
1537	static void findAndroidArmMultilibs(const Driver &D,
1538	const llvm::Triple &TargetTriple,
1539	StringRef Path, const ArgList &Args,
1540	DetectedMultilibs &Result) {
1541	// Find multilibs with subdirectories like armv7-a, thumb, armv7-a/thumb.
1542	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1543	MultilibBuilder ArmV7Multilib = MultilibBuilder("/armv7-a")
1544	.flag(Flag: "-march=armv7-a")
1545	.flag(Flag: "-mthumb", /*Disallow=*/true);
1546	MultilibBuilder ThumbMultilib = MultilibBuilder("/thumb")
1547	.flag(Flag: "-march=armv7-a", /*Disallow=*/true)
1548	.flag(Flag: "-mthumb");
1549	MultilibBuilder ArmV7ThumbMultilib =
1550	MultilibBuilder("/armv7-a/thumb").flag(Flag: "-march=armv7-a").flag(Flag: "-mthumb");
1551	MultilibBuilder DefaultMultilib =
1552	MultilibBuilder("")
1553	.flag(Flag: "-march=armv7-a", /*Disallow=*/true)
1554	.flag(Flag: "-mthumb", /*Disallow=*/true);
1555	MultilibSet AndroidArmMultilibs =
1556	MultilibSetBuilder()
1557	.Either(M1: ThumbMultilib, M2: ArmV7Multilib, M3: ArmV7ThumbMultilib,
1558	M4: DefaultMultilib)
1559	.makeMultilibSet()
1560	.FilterOut(F: NonExistent);
1561
1562	Multilib::flags_list Flags;
1563	llvm::StringRef Arch = Args.getLastArgValue(options::OPT_march_EQ);
1564	bool IsArmArch = TargetTriple.getArch() == llvm::Triple::arm;
1565	bool IsThumbArch = TargetTriple.getArch() == llvm::Triple::thumb;
1566	bool IsV7SubArch = TargetTriple.getSubArch() == llvm::Triple::ARMSubArch_v7;
1567	bool IsThumbMode = IsThumbArch ||
1568	Args.hasFlag(options::OPT_mthumb, options::OPT_mno_thumb, false) ||
1569	(IsArmArch && llvm::ARM::parseArchISA(Arch) == llvm::ARM::ISAKind::THUMB);
1570	bool IsArmV7Mode = (IsArmArch || IsThumbArch) &&
1571	(llvm::ARM::parseArchVersion(Arch) == 7 ||
1572	(IsArmArch && Arch == "" && IsV7SubArch));
1573	addMultilibFlag(Enabled: IsArmV7Mode, Flag: "-march=armv7-a", Flags);
1574	addMultilibFlag(Enabled: IsThumbMode, Flag: "-mthumb", Flags);
1575
1576	if (AndroidArmMultilibs.select(D, Flags, Result.SelectedMultilibs))
1577	Result.Multilibs = AndroidArmMultilibs;
1578	}
1579
1580	static bool findMSP430Multilibs(const Driver &D,
1581	const llvm::Triple &TargetTriple,
1582	StringRef Path, const ArgList &Args,
1583	DetectedMultilibs &Result) {
1584	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1585	MultilibBuilder WithoutExceptions =
1586	MultilibBuilder("/430").flag(Flag: "-exceptions", /*Disallow=*/true);
1587	MultilibBuilder WithExceptions =
1588	MultilibBuilder("/430/exceptions").flag(Flag: "-exceptions");
1589
1590	// FIXME: when clang starts to support msp430x ISA additional logic
1591	// to select between multilib must be implemented
1592	// MultilibBuilder MSP430xMultilib = MultilibBuilder("/large");
1593
1594	Result.Multilibs.push_back(M: WithoutExceptions.makeMultilib());
1595	Result.Multilibs.push_back(M: WithExceptions.makeMultilib());
1596	Result.Multilibs.FilterOut(F: NonExistent);
1597
1598	Multilib::flags_list Flags;
1599	addMultilibFlag(Args.hasFlag(options::OPT_fexceptions,
1600	options::OPT_fno_exceptions, false),
1601	"-exceptions", Flags);
1602	if (Result.Multilibs.select(D, Flags, Result.SelectedMultilibs))
1603	return true;
1604
1605	return false;
1606	}
1607
1608	static void findCSKYMultilibs(const Driver &D, const llvm::Triple &TargetTriple,
1609	StringRef Path, const ArgList &Args,
1610	DetectedMultilibs &Result) {
1611	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1612
1613	tools::csky::FloatABI TheFloatABI = tools::csky::getCSKYFloatABI(D, Args);
1614	std::optional<llvm::StringRef> Res =
1615	tools::csky::getCSKYArchName(D, Args, Triple: TargetTriple);
1616
1617	if (!Res)
1618	return;
1619	auto ARCHName = *Res;
1620
1621	Multilib::flags_list Flags;
1622	addMultilibFlag(Enabled: TheFloatABI == tools::csky::FloatABI::Hard, Flag: "-hard-fp",
1623	Flags);
1624	addMultilibFlag(Enabled: TheFloatABI == tools::csky::FloatABI::SoftFP, Flag: "-soft-fp",
1625	Flags);
1626	addMultilibFlag(Enabled: TheFloatABI == tools::csky::FloatABI::Soft, Flag: "-soft", Flags);
1627	addMultilibFlag(Enabled: ARCHName == "ck801", Flag: "-march=ck801", Flags);
1628	addMultilibFlag(Enabled: ARCHName == "ck802", Flag: "-march=ck802", Flags);
1629	addMultilibFlag(Enabled: ARCHName == "ck803", Flag: "-march=ck803", Flags);
1630	addMultilibFlag(Enabled: ARCHName == "ck804", Flag: "-march=ck804", Flags);
1631	addMultilibFlag(Enabled: ARCHName == "ck805", Flag: "-march=ck805", Flags);
1632	addMultilibFlag(Enabled: ARCHName == "ck807", Flag: "-march=ck807", Flags);
1633	addMultilibFlag(Enabled: ARCHName == "ck810", Flag: "-march=ck810", Flags);
1634	addMultilibFlag(Enabled: ARCHName == "ck810v", Flag: "-march=ck810v", Flags);
1635	addMultilibFlag(Enabled: ARCHName == "ck860", Flag: "-march=ck860", Flags);
1636	addMultilibFlag(Enabled: ARCHName == "ck860v", Flag: "-march=ck860v", Flags);
1637
1638	bool isBigEndian = false;
1639	if (Arg *A = Args.getLastArg(options::OPT_mlittle_endian,
1640	options::OPT_mbig_endian))
1641	isBigEndian = !A->getOption().matches(options::OPT_mlittle_endian);
1642	addMultilibFlag(Enabled: isBigEndian, Flag: "-EB", Flags);
1643
1644	auto HardFloat = MultilibBuilder("/hard-fp").flag(Flag: "-hard-fp");
1645	auto SoftFpFloat = MultilibBuilder("/soft-fp").flag(Flag: "-soft-fp");
1646	auto SoftFloat = MultilibBuilder("").flag(Flag: "-soft");
1647	auto Arch801 = MultilibBuilder("/ck801").flag(Flag: "-march=ck801");
1648	auto Arch802 = MultilibBuilder("/ck802").flag(Flag: "-march=ck802");
1649	auto Arch803 = MultilibBuilder("/ck803").flag(Flag: "-march=ck803");
1650	// CK804 use the same library as CK803
1651	auto Arch804 = MultilibBuilder("/ck803").flag(Flag: "-march=ck804");
1652	auto Arch805 = MultilibBuilder("/ck805").flag(Flag: "-march=ck805");
1653	auto Arch807 = MultilibBuilder("/ck807").flag(Flag: "-march=ck807");
1654	auto Arch810 = MultilibBuilder("").flag(Flag: "-march=ck810");
1655	auto Arch810v = MultilibBuilder("/ck810v").flag(Flag: "-march=ck810v");
1656	auto Arch860 = MultilibBuilder("/ck860").flag(Flag: "-march=ck860");
1657	auto Arch860v = MultilibBuilder("/ck860v").flag(Flag: "-march=ck860v");
1658	auto BigEndian = MultilibBuilder("/big").flag(Flag: "-EB");
1659
1660	MultilibSet CSKYMultilibs =
1661	MultilibSetBuilder()
1662	.Maybe(M: BigEndian)
1663	.Either(Ms: {Arch801, Arch802, Arch803, Arch804, Arch805, Arch807,
1664	Arch810, Arch810v, Arch860, Arch860v})
1665	.Either(M1: HardFloat, M2: SoftFpFloat, M3: SoftFloat)
1666	.makeMultilibSet()
1667	.FilterOut(F: NonExistent);
1668
1669	if (CSKYMultilibs.select(D, Flags, Result.SelectedMultilibs))
1670	Result.Multilibs = CSKYMultilibs;
1671	}
1672
1673	/// Extend the multi-lib re-use selection mechanism for RISC-V.
1674	/// This function will try to re-use multi-lib if they are compatible.
1675	/// Definition of compatible:
1676	/// - ABI must be the same.
1677	/// - multi-lib is a subset of current arch, e.g. multi-lib=march=rv32im
1678	/// is a subset of march=rv32imc.
1679	/// - march that contains atomic extension can't reuse multi-lib that
1680	/// doesn't have atomic, vice versa. e.g. multi-lib=march=rv32im and
1681	/// march=rv32ima are not compatible, because software and hardware
1682	/// atomic operation can't work together correctly.
1683	static bool
1684	selectRISCVMultilib(const Driver &D, const MultilibSet &RISCVMultilibSet,
1685	StringRef Arch, const Multilib::flags_list &Flags,
1686	llvm::SmallVectorImpl<Multilib> &SelectedMultilibs) {
1687	// Try to find the perfect matching multi-lib first.
1688	if (RISCVMultilibSet.select(D, Flags, SelectedMultilibs))
1689	return true;
1690
1691	Multilib::flags_list NewFlags;
1692	std::vector<MultilibBuilder> NewMultilibs;
1693
1694	llvm::Expected<std::unique_ptr<llvm::RISCVISAInfo>> ParseResult =
1695	llvm::RISCVISAInfo::parseArchString(
1696	Arch, /*EnableExperimentalExtension=*/true,
1697	/*ExperimentalExtensionVersionCheck=*/false);
1698	// Ignore any error here, we assume it will be handled in another place.
1699	if (llvm::errorToBool(Err: ParseResult.takeError()))
1700	return false;
1701
1702	auto &ISAInfo = *ParseResult;
1703
1704	addMultilibFlag(Enabled: ISAInfo->getXLen() == 32, Flag: "-m32", Flags&: NewFlags);
1705	addMultilibFlag(Enabled: ISAInfo->getXLen() == 64, Flag: "-m64", Flags&: NewFlags);
1706
1707	// Collect all flags except march=*
1708	for (StringRef Flag : Flags) {
1709	if (Flag.starts_with(Prefix: "!march=") || Flag.starts_with(Prefix: "-march="))
1710	continue;
1711
1712	NewFlags.push_back(x: Flag.str());
1713	}
1714
1715	llvm::StringSet<> AllArchExts;
1716	// Reconstruct multi-lib list, and break march option into separated
1717	// extension. e.g. march=rv32im -> +i +m
1718	for (const auto &M : RISCVMultilibSet) {
1719	bool Skip = false;
1720
1721	MultilibBuilder NewMultilib =
1722	MultilibBuilder(M.gccSuffix(), M.osSuffix(), M.includeSuffix());
1723	for (StringRef Flag : M.flags()) {
1724	// Add back all flags except -march.
1725	if (!Flag.consume_front(Prefix: "-march=")) {
1726	NewMultilib.flag(Flag);
1727	continue;
1728	}
1729
1730	// Break down -march into individual extension.
1731	llvm::Expected<std::unique_ptr<llvm::RISCVISAInfo>> MLConfigParseResult =
1732	llvm::RISCVISAInfo::parseArchString(
1733	Arch: Flag, /*EnableExperimentalExtension=*/true,
1734	/*ExperimentalExtensionVersionCheck=*/false);
1735	// Ignore any error here, we assume it will handled in another place.
1736	if (llvm::errorToBool(Err: MLConfigParseResult.takeError())) {
1737	// We might get a parsing error if rv32e in the list, we could just skip
1738	// that and process the rest of multi-lib configs.
1739	Skip = true;
1740	continue;
1741	}
1742	auto &MLConfigISAInfo = *MLConfigParseResult;
1743
1744	for (auto &MLConfigArchExt : MLConfigISAInfo->getExtensions()) {
1745	auto ExtName = MLConfigArchExt.first;
1746	NewMultilib.flag(Flag: Twine("-", ExtName).str());
1747
1748	if (AllArchExts.insert(key: ExtName).second) {
1749	addMultilibFlag(Enabled: ISAInfo->hasExtension(Ext: ExtName),
1750	Flag: Twine("-", ExtName).str(), Flags&: NewFlags);
1751	}
1752	}
1753
1754	// Check the XLEN explicitly.
1755	if (MLConfigISAInfo->getXLen() == 32) {
1756	NewMultilib.flag(Flag: "-m32");
1757	NewMultilib.flag(Flag: "-m64", /*Disallow*/ true);
1758	} else {
1759	NewMultilib.flag(Flag: "-m32", /*Disallow*/ true);
1760	NewMultilib.flag(Flag: "-m64");
1761	}
1762
1763	// Atomic extension must be explicitly checked, soft and hard atomic
1764	// operation never co-work correctly.
1765	if (!MLConfigISAInfo->hasExtension(Ext: "a"))
1766	NewMultilib.flag(Flag: "-a", /*Disallow*/ true);
1767	}
1768
1769	if (Skip)
1770	continue;
1771
1772	NewMultilibs.emplace_back(args&: NewMultilib);
1773	}
1774
1775	// Build an internal used only multi-lib list, used for checking any
1776	// compatible multi-lib.
1777	MultilibSet NewRISCVMultilibs =
1778	MultilibSetBuilder().Either(Ms: NewMultilibs).makeMultilibSet();
1779
1780	if (NewRISCVMultilibs.select(D, Flags: NewFlags, SelectedMultilibs))
1781	for (const Multilib &NewSelectedM : SelectedMultilibs)
1782	for (const auto &M : RISCVMultilibSet)
1783	// Look up the corresponding multi-lib entry in original multi-lib set.
1784	if (M.gccSuffix() == NewSelectedM.gccSuffix())
1785	return true;
1786
1787	return false;
1788	}
1789
1790	static void findRISCVBareMetalMultilibs(const Driver &D,
1791	const llvm::Triple &TargetTriple,
1792	StringRef Path, const ArgList &Args,
1793	DetectedMultilibs &Result) {
1794	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1795	struct RiscvMultilib {
1796	StringRef march;
1797	StringRef mabi;
1798	};
1799	// currently only support the set of multilibs like riscv-gnu-toolchain does.
1800	// TODO: support MULTILIB_REUSE
1801	constexpr RiscvMultilib RISCVMultilibSet[] = {
1802	{.march: "rv32i", .mabi: "ilp32"}, {.march: "rv32im", .mabi: "ilp32"}, {.march: "rv32iac", .mabi: "ilp32"},
1803	{.march: "rv32imac", .mabi: "ilp32"}, {.march: "rv32imafc", .mabi: "ilp32f"}, {.march: "rv64imac", .mabi: "lp64"},
1804	{.march: "rv64imafdc", .mabi: "lp64d"}};
1805
1806	std::vector<MultilibBuilder> Ms;
1807	for (auto Element : RISCVMultilibSet) {
1808	// multilib path rule is ${march}/${mabi}
1809	Ms.emplace_back(
1810	args&: MultilibBuilder(
1811	(Twine(Element.march) + "/" + Twine(Element.mabi)).str())
1812	.flag(Flag: Twine("-march=", Element.march).str())
1813	.flag(Flag: Twine("-mabi=", Element.mabi).str()));
1814	}
1815	MultilibSet RISCVMultilibs =
1816	MultilibSetBuilder()
1817	.Either(Ms)
1818	.makeMultilibSet()
1819	.FilterOut(F: NonExistent)
1820	.setFilePathsCallback([](const Multilib &M) {
1821	return std::vector<std::string>(
1822	{M.gccSuffix(),
1823	"/../../../../riscv64-unknown-elf/lib" + M.gccSuffix(),
1824	"/../../../../riscv32-unknown-elf/lib" + M.gccSuffix()});
1825	});
1826
1827	Multilib::flags_list Flags;
1828	llvm::StringSet<> Added_ABIs;
1829	StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple: TargetTriple);
1830	std::string MArch = tools::riscv::getRISCVArch(Args, Triple: TargetTriple);
1831	for (auto Element : RISCVMultilibSet) {
1832	addMultilibFlag(Enabled: MArch == Element.march,
1833	Flag: Twine("-march=", Element.march).str().c_str(), Flags);
1834	if (!Added_ABIs.count(Key: Element.mabi)) {
1835	Added_ABIs.insert(key: Element.mabi);
1836	addMultilibFlag(Enabled: ABIName == Element.mabi,
1837	Flag: Twine("-mabi=", Element.mabi).str().c_str(), Flags);
1838	}
1839	}
1840
1841	if (selectRISCVMultilib(D, RISCVMultilibSet: RISCVMultilibs, Arch: MArch, Flags,
1842	SelectedMultilibs&: Result.SelectedMultilibs))
1843	Result.Multilibs = RISCVMultilibs;
1844	}
1845
1846	static void findRISCVMultilibs(const Driver &D,
1847	const llvm::Triple &TargetTriple, StringRef Path,
1848	const ArgList &Args, DetectedMultilibs &Result) {
1849	if (TargetTriple.getOS() == llvm::Triple::UnknownOS)
1850	return findRISCVBareMetalMultilibs(D, TargetTriple, Path, Args, Result);
1851
1852	FilterNonExistent NonExistent(Path, "/crtbegin.o", D.getVFS());
1853	MultilibBuilder Ilp32 =
1854	MultilibBuilder("lib32/ilp32").flag(Flag: "-m32").flag(Flag: "-mabi=ilp32");
1855	MultilibBuilder Ilp32f =
1856	MultilibBuilder("lib32/ilp32f").flag(Flag: "-m32").flag(Flag: "-mabi=ilp32f");
1857	MultilibBuilder Ilp32d =
1858	MultilibBuilder("lib32/ilp32d").flag(Flag: "-m32").flag(Flag: "-mabi=ilp32d");
1859	MultilibBuilder Lp64 =
1860	MultilibBuilder("lib64/lp64").flag(Flag: "-m64").flag(Flag: "-mabi=lp64");
1861	MultilibBuilder Lp64f =
1862	MultilibBuilder("lib64/lp64f").flag(Flag: "-m64").flag(Flag: "-mabi=lp64f");
1863	MultilibBuilder Lp64d =
1864	MultilibBuilder("lib64/lp64d").flag(Flag: "-m64").flag(Flag: "-mabi=lp64d");
1865	MultilibSet RISCVMultilibs =
1866	MultilibSetBuilder()
1867	.Either(Ms: {Ilp32, Ilp32f, Ilp32d, Lp64, Lp64f, Lp64d})
1868	.makeMultilibSet()
1869	.FilterOut(F: NonExistent);
1870
1871	Multilib::flags_list Flags;
1872	bool IsRV64 = TargetTriple.getArch() == llvm::Triple::riscv64;
1873	StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple: TargetTriple);
1874
1875	addMultilibFlag(Enabled: !IsRV64, Flag: "-m32", Flags);
1876	addMultilibFlag(Enabled: IsRV64, Flag: "-m64", Flags);
1877	addMultilibFlag(Enabled: ABIName == "ilp32", Flag: "-mabi=ilp32", Flags);
1878	addMultilibFlag(Enabled: ABIName == "ilp32f", Flag: "-mabi=ilp32f", Flags);
1879	addMultilibFlag(Enabled: ABIName == "ilp32d", Flag: "-mabi=ilp32d", Flags);
1880	addMultilibFlag(Enabled: ABIName == "lp64", Flag: "-mabi=lp64", Flags);
1881	addMultilibFlag(Enabled: ABIName == "lp64f", Flag: "-mabi=lp64f", Flags);
1882	addMultilibFlag(Enabled: ABIName == "lp64d", Flag: "-mabi=lp64d", Flags);
1883
1884	if (RISCVMultilibs.select(D, Flags, Result.SelectedMultilibs))
1885	Result.Multilibs = RISCVMultilibs;
1886	}
1887
1888	static bool findBiarchMultilibs(const Driver &D,
1889	const llvm::Triple &TargetTriple,
1890	StringRef Path, const ArgList &Args,
1891	bool NeedsBiarchSuffix,
1892	DetectedMultilibs &Result) {
1893	MultilibBuilder DefaultBuilder;
1894
1895	// Some versions of SUSE and Fedora on ppc64 put 32-bit libs
1896	// in what would normally be GCCInstallPath and put the 64-bit
1897	// libs in a subdirectory named 64. The simple logic we follow is that
1898	// *if* there is a subdirectory of the right name with crtbegin.o in it,
1899	// we use that. If not, and if not a biarch triple alias, we look for
1900	// crtbegin.o without the subdirectory.
1901
1902	StringRef Suff64 = "/64";
1903	// Solaris uses platform-specific suffixes instead of /64.
1904	if (TargetTriple.isOSSolaris()) {
1905	switch (TargetTriple.getArch()) {
1906	case llvm::Triple::x86:
1907	case llvm::Triple::x86_64:
1908	Suff64 = "/amd64";
1909	break;
1910	case llvm::Triple::sparc:
1911	case llvm::Triple::sparcv9:
1912	Suff64 = "/sparcv9";
1913	break;
1914	default:
1915	break;
1916	}
1917	}
1918
1919	Multilib Alt64 = MultilibBuilder()
1920	.gccSuffix(S: Suff64)
1921	.includeSuffix(S: Suff64)
1922	.flag(Flag: "-m32", /*Disallow=*/true)
1923	.flag(Flag: "-m64")
1924	.flag(Flag: "-mx32", /*Disallow=*/true)
1925	.makeMultilib();
1926	Multilib Alt32 = MultilibBuilder()
1927	.gccSuffix(S: "/32")
1928	.includeSuffix(S: "/32")
1929	.flag(Flag: "-m32")
1930	.flag(Flag: "-m64", /*Disallow=*/true)
1931	.flag(Flag: "-mx32", /*Disallow=*/true)
1932	.makeMultilib();
1933	Multilib Altx32 = MultilibBuilder()
1934	.gccSuffix(S: "/x32")
1935	.includeSuffix(S: "/x32")
1936	.flag(Flag: "-m32", /*Disallow=*/true)
1937	.flag(Flag: "-m64", /*Disallow=*/true)
1938	.flag(Flag: "-mx32")
1939	.makeMultilib();
1940	Multilib Alt32sparc = MultilibBuilder()
1941	.gccSuffix(S: "/sparcv8plus")
1942	.includeSuffix(S: "/sparcv8plus")
1943	.flag(Flag: "-m32")
1944	.flag(Flag: "-m64", /*Disallow=*/true)
1945	.makeMultilib();
1946
1947	// GCC toolchain for IAMCU doesn't have crtbegin.o, so look for libgcc.a.
1948	FilterNonExistent NonExistent(
1949	Path, TargetTriple.isOSIAMCU() ? "/libgcc.a" : "/crtbegin.o", D.getVFS());
1950
1951	// Determine default multilib from: 32, 64, x32
1952	// Also handle cases such as 64 on 32, 32 on 64, etc.
1953	enum { UNKNOWN, WANT32, WANT64, WANTX32 } Want = UNKNOWN;
1954	const bool IsX32 = TargetTriple.isX32();
1955	if (TargetTriple.isArch32Bit() && !NonExistent(Alt32))
1956	Want = WANT64;
1957	if (TargetTriple.isArch32Bit() && !NonExistent(Alt32sparc))
1958	Want = WANT64;
1959	else if (TargetTriple.isArch64Bit() && IsX32 && !NonExistent(Altx32))
1960	Want = WANT64;
1961	else if (TargetTriple.isArch64Bit() && !IsX32 && !NonExistent(Alt64))
1962	Want = WANT32;
1963	else if (TargetTriple.isArch64Bit() && !NonExistent(Alt32sparc))
1964	Want = WANT64;
1965	else {
1966	if (TargetTriple.isArch32Bit())
1967	Want = NeedsBiarchSuffix ? WANT64 : WANT32;
1968	else if (IsX32)
1969	Want = NeedsBiarchSuffix ? WANT64 : WANTX32;
1970	else
1971	Want = NeedsBiarchSuffix ? WANT32 : WANT64;
1972	}
1973
1974	if (Want == WANT32)
1975	DefaultBuilder.flag(Flag: "-m32")
1976	.flag(Flag: "-m64", /*Disallow=*/true)
1977	.flag(Flag: "-mx32", /*Disallow=*/true);
1978	else if (Want == WANT64)
1979	DefaultBuilder.flag(Flag: "-m32", /*Disallow=*/true)
1980	.flag(Flag: "-m64")
1981	.flag(Flag: "-mx32", /*Disallow=*/true);
1982	else if (Want == WANTX32)
1983	DefaultBuilder.flag(Flag: "-m32", /*Disallow=*/true)
1984	.flag(Flag: "-m64", /*Disallow=*/true)
1985	.flag(Flag: "-mx32");
1986	else
1987	return false;
1988
1989	Multilib Default = DefaultBuilder.makeMultilib();
1990
1991	Result.Multilibs.push_back(M: Default);
1992	Result.Multilibs.push_back(M: Alt64);
1993	Result.Multilibs.push_back(M: Alt32);
1994	Result.Multilibs.push_back(M: Altx32);
1995	Result.Multilibs.push_back(M: Alt32sparc);
1996
1997	Result.Multilibs.FilterOut(F: NonExistent);
1998
1999	Multilib::flags_list Flags;
2000	addMultilibFlag(Enabled: TargetTriple.isArch64Bit() && !IsX32, Flag: "-m64", Flags);
2001	addMultilibFlag(Enabled: TargetTriple.isArch32Bit(), Flag: "-m32", Flags);
2002	addMultilibFlag(Enabled: TargetTriple.isArch64Bit() && IsX32, Flag: "-mx32", Flags);
2003
2004	if (!Result.Multilibs.select(D, Flags, Result.SelectedMultilibs))
2005	return false;
2006
2007	if (Result.SelectedMultilibs.back() == Alt64 ||
2008	Result.SelectedMultilibs.back() == Alt32 ||
2009	Result.SelectedMultilibs.back() == Altx32 ||
2010	Result.SelectedMultilibs.back() == Alt32sparc)
2011	Result.BiarchSibling = Default;
2012
2013	return true;
2014	}
2015
2016	/// Generic_GCC - A tool chain using the 'gcc' command to perform
2017	/// all subcommands; this relies on gcc translating the majority of
2018	/// command line options.
2019
2020	/// Less-than for GCCVersion, implementing a Strict Weak Ordering.
2021	bool Generic_GCC::GCCVersion::isOlderThan(int RHSMajor, int RHSMinor,
2022	int RHSPatch,
2023	StringRef RHSPatchSuffix) const {
2024	if (Major != RHSMajor)
2025	return Major < RHSMajor;
2026	if (Minor != RHSMinor) {
2027	// Note that versions without a specified minor sort higher than those with
2028	// a minor.
2029	if (RHSMinor == -1)
2030	return true;
2031	if (Minor == -1)
2032	return false;
2033	return Minor < RHSMinor;
2034	}
2035	if (Patch != RHSPatch) {
2036	// Note that versions without a specified patch sort higher than those with
2037	// a patch.
2038	if (RHSPatch == -1)
2039	return true;
2040	if (Patch == -1)
2041	return false;
2042
2043	// Otherwise just sort on the patch itself.
2044	return Patch < RHSPatch;
2045	}
2046	if (PatchSuffix != RHSPatchSuffix) {
2047	// Sort empty suffixes higher.
2048	if (RHSPatchSuffix.empty())
2049	return true;
2050	if (PatchSuffix.empty())
2051	return false;
2052
2053	// Provide a lexicographic sort to make this a total ordering.
2054	return PatchSuffix < RHSPatchSuffix;
2055	}
2056
2057	// The versions are equal.
2058	return false;
2059	}
2060
2061	/// Parse a GCCVersion object out of a string of text.
2062	///
2063	/// This is the primary means of forming GCCVersion objects.
2064	/*static*/
2065	Generic_GCC::GCCVersion Generic_GCC::GCCVersion::Parse(StringRef VersionText) {
2066	const GCCVersion BadVersion = {.Text: VersionText.str(), .Major: -1, .Minor: -1, .Patch: -1, .MajorStr: "", .MinorStr: "", .PatchSuffix: ""};
2067	std::pair<StringRef, StringRef> First = VersionText.split(Separator: '.');
2068	std::pair<StringRef, StringRef> Second = First.second.split(Separator: '.');
2069
2070	StringRef MajorStr = First.first;
2071	StringRef MinorStr = Second.first;
2072	StringRef PatchStr = Second.second;
2073
2074	GCCVersion GoodVersion = {.Text: VersionText.str(), .Major: -1, .Minor: -1, .Patch: -1, .MajorStr: "", .MinorStr: "", .PatchSuffix: ""};
2075
2076	// Parse version number strings such as:
2077	// 5
2078	// 4.4
2079	// 4.4-patched
2080	// 4.4.0
2081	// 4.4.x
2082	// 4.4.2-rc4
2083	// 4.4.x-patched
2084	// 10-win32
2085	// Split on '.', handle 1, 2 or 3 such segments. Each segment must contain
2086	// purely a number, except for the last one, where a non-number suffix
2087	// is stored in PatchSuffix. The third segment is allowed to not contain
2088	// a number at all.
2089
2090	auto TryParseLastNumber = [&](StringRef Segment, int &Number,
2091	std::string &OutStr) -> bool {
2092	// Look for a number prefix and parse that, and split out any trailing
2093	// string into GoodVersion.PatchSuffix.
2094
2095	if (size_t EndNumber = Segment.find_first_not_of(Chars: "0123456789")) {
2096	StringRef NumberStr = Segment.slice(Start: 0, End: EndNumber);
2097	if (NumberStr.getAsInteger(Radix: 10, Result&: Number) || Number < 0)
2098	return false;
2099	OutStr = NumberStr;
2100	GoodVersion.PatchSuffix = Segment.substr(Start: EndNumber);
2101	return true;
2102	}
2103	return false;
2104	};
2105	auto TryParseNumber = [](StringRef Segment, int &Number) -> bool {
2106	if (Segment.getAsInteger(Radix: 10, Result&: Number) || Number < 0)
2107	return false;
2108	return true;
2109	};
2110
2111	if (MinorStr.empty()) {
2112	// If no minor string, major is the last segment
2113	if (!TryParseLastNumber(MajorStr, GoodVersion.Major, GoodVersion.MajorStr))
2114	return BadVersion;
2115	return GoodVersion;
2116	}
2117
2118	if (!TryParseNumber(MajorStr, GoodVersion.Major))
2119	return BadVersion;
2120	GoodVersion.MajorStr = MajorStr;
2121
2122	if (PatchStr.empty()) {
2123	// If no patch string, minor is the last segment
2124	if (!TryParseLastNumber(MinorStr, GoodVersion.Minor, GoodVersion.MinorStr))
2125	return BadVersion;
2126	return GoodVersion;
2127	}
2128
2129	if (!TryParseNumber(MinorStr, GoodVersion.Minor))
2130	return BadVersion;
2131	GoodVersion.MinorStr = MinorStr;
2132
2133	// For the last segment, tolerate a missing number.
2134	std::string DummyStr;
2135	TryParseLastNumber(PatchStr, GoodVersion.Patch, DummyStr);
2136	return GoodVersion;
2137	}
2138
2139	static llvm::StringRef getGCCToolchainDir(const ArgList &Args,
2140	llvm::StringRef SysRoot) {
2141	const Arg *A = Args.getLastArg(clang::driver::options::OPT_gcc_toolchain);
2142	if (A)
2143	return A->getValue();
2144
2145	// If we have a SysRoot, ignore GCC_INSTALL_PREFIX.
2146	// GCC_INSTALL_PREFIX specifies the gcc installation for the default
2147	// sysroot and is likely not valid with a different sysroot.
2148	if (!SysRoot.empty())
2149	return "";
2150
2151	return GCC_INSTALL_PREFIX;
2152	}
2153
2154	/// Initialize a GCCInstallationDetector from the driver.
2155	///
2156	/// This performs all of the autodetection and sets up the various paths.
2157	/// Once constructed, a GCCInstallationDetector is essentially immutable.
2158	///
2159	/// FIXME: We shouldn't need an explicit TargetTriple parameter here, and
2160	/// should instead pull the target out of the driver. This is currently
2161	/// necessary because the driver doesn't store the final version of the target
2162	/// triple.
2163	void Generic_GCC::GCCInstallationDetector::init(
2164	const llvm::Triple &TargetTriple, const ArgList &Args) {
2165	llvm::Triple BiarchVariantTriple = TargetTriple.isArch32Bit()
2166	? TargetTriple.get64BitArchVariant()
2167	: TargetTriple.get32BitArchVariant();
2168	// The library directories which may contain GCC installations.
2169	SmallVector<StringRef, 4> CandidateLibDirs, CandidateBiarchLibDirs;
2170	// The compatible GCC triples for this particular architecture.
2171	SmallVector<StringRef, 16> CandidateTripleAliases;
2172	SmallVector<StringRef, 16> CandidateBiarchTripleAliases;
2173	// Add some triples that we want to check first.
2174	CandidateTripleAliases.push_back(Elt: TargetTriple.str());
2175	std::string TripleNoVendor, BiarchTripleNoVendor;
2176	if (TargetTriple.getVendor() == llvm::Triple::UnknownVendor) {
2177	StringRef OSEnv = TargetTriple.getOSAndEnvironmentName();
2178	if (TargetTriple.getEnvironment() == llvm::Triple::GNUX32)
2179	OSEnv = "linux-gnu";
2180	TripleNoVendor = (TargetTriple.getArchName().str() + '-' + OSEnv).str();
2181	CandidateTripleAliases.push_back(Elt: TripleNoVendor);
2182	if (BiarchVariantTriple.getArch() != llvm::Triple::UnknownArch) {
2183	BiarchTripleNoVendor =
2184	(BiarchVariantTriple.getArchName().str() + '-' + OSEnv).str();
2185	CandidateBiarchTripleAliases.push_back(Elt: BiarchTripleNoVendor);
2186	}
2187	}
2188
2189	CollectLibDirsAndTriples(TargetTriple, BiarchTriple: BiarchVariantTriple, LibDirs&: CandidateLibDirs,
2190	TripleAliases&: CandidateTripleAliases, BiarchLibDirs&: CandidateBiarchLibDirs,
2191	BiarchTripleAliases&: CandidateBiarchTripleAliases);
2192
2193	// If --gcc-install-dir= is specified, skip filesystem detection.
2194	if (const Arg *A =
2195	Args.getLastArg(clang::driver::options::OPT_gcc_install_dir_EQ);
2196	A && A->getValue()[0]) {
2197	StringRef InstallDir = A->getValue();
2198	if (!ScanGCCForMultilibs(TargetTriple, Args, Path: InstallDir, NeedsBiarchSuffix: false)) {
2199	D.Diag(diag::err_drv_invalid_gcc_install_dir) << InstallDir;
2200	} else {
2201	(void)InstallDir.consume_back(Suffix: "/");
2202	StringRef VersionText = llvm::sys::path::filename(path: InstallDir);
2203	StringRef TripleText =
2204	llvm::sys::path::filename(path: llvm::sys::path::parent_path(path: InstallDir));
2205
2206	Version = GCCVersion::Parse(VersionText);
2207	GCCTriple.setTriple(TripleText);
2208	GCCInstallPath = std::string(InstallDir);
2209	GCCParentLibPath = GCCInstallPath + "/../../..";
2210	IsValid = true;
2211	}
2212	return;
2213	}
2214
2215	// If --gcc-triple is specified use this instead of trying to
2216	// auto-detect a triple.
2217	if (const Arg *A =
2218	Args.getLastArg(clang::driver::options::OPT_gcc_triple_EQ)) {
2219	StringRef GCCTriple = A->getValue();
2220	CandidateTripleAliases.clear();
2221	CandidateTripleAliases.push_back(Elt: GCCTriple);
2222	}
2223
2224	// Compute the set of prefixes for our search.
2225	SmallVector<std::string, 8> Prefixes;
2226	StringRef GCCToolchainDir = getGCCToolchainDir(Args, SysRoot: D.SysRoot);
2227	if (GCCToolchainDir != "") {
2228	if (GCCToolchainDir.back() == '/')
2229	GCCToolchainDir = GCCToolchainDir.drop_back(); // remove the /
2230
2231	Prefixes.push_back(Elt: std::string(GCCToolchainDir));
2232	} else {
2233	// If we have a SysRoot, try that first.
2234	if (!D.SysRoot.empty()) {
2235	Prefixes.push_back(Elt: D.SysRoot);
2236	AddDefaultGCCPrefixes(TargetTriple, Prefixes, SysRoot: D.SysRoot);
2237	}
2238
2239	// Then look for gcc installed alongside clang.
2240	Prefixes.push_back(Elt: D.Dir + "/..");
2241
2242	// Next, look for prefix(es) that correspond to distribution-supplied gcc
2243	// installations.
2244	if (D.SysRoot.empty()) {
2245	// Typically /usr.
2246	AddDefaultGCCPrefixes(TargetTriple, Prefixes, SysRoot: D.SysRoot);
2247	}
2248
2249	// Try to respect gcc-config on Gentoo if --gcc-toolchain is not provided.
2250	// This avoids accidentally enforcing the system GCC version when using a
2251	// custom toolchain.
2252	SmallVector<StringRef, 16> GentooTestTriples;
2253	// Try to match an exact triple as target triple first.
2254	// e.g. crossdev -S x86_64-gentoo-linux-gnu will install gcc libs for
2255	// x86_64-gentoo-linux-gnu. But "clang -target x86_64-gentoo-linux-gnu"
2256	// may pick the libraries for x86_64-pc-linux-gnu even when exact matching
2257	// triple x86_64-gentoo-linux-gnu is present.
2258	GentooTestTriples.push_back(Elt: TargetTriple.str());
2259	GentooTestTriples.append(in_start: CandidateTripleAliases.begin(),
2260	in_end: CandidateTripleAliases.end());
2261	if (ScanGentooConfigs(TargetTriple, Args, CandidateTriples: GentooTestTriples,
2262	BiarchTriples: CandidateBiarchTripleAliases))
2263	return;
2264	}
2265
2266	// Loop over the various components which exist and select the best GCC
2267	// installation available. GCC installs are ranked by version number.
2268	const GCCVersion VersionZero = GCCVersion::Parse(VersionText: "0.0.0");
2269	Version = VersionZero;
2270	for (const std::string &Prefix : Prefixes) {
2271	auto &VFS = D.getVFS();
2272	if (!VFS.exists(Path: Prefix))
2273	continue;
2274	for (StringRef Suffix : CandidateLibDirs) {
2275	const std::string LibDir = concat(Path: Prefix, A: Suffix);
2276	if (!VFS.exists(Path: LibDir))
2277	continue;
2278	// Maybe filter out <libdir>/gcc and <libdir>/gcc-cross.
2279	bool GCCDirExists = VFS.exists(Path: LibDir + "/gcc");
2280	bool GCCCrossDirExists = VFS.exists(Path: LibDir + "/gcc-cross");
2281	for (StringRef Candidate : CandidateTripleAliases)
2282	ScanLibDirForGCCTriple(TargetArch: TargetTriple, Args, LibDir, CandidateTriple: Candidate, NeedsBiarchSuffix: false,
2283	GCCDirExists, GCCCrossDirExists);
2284	}
2285	for (StringRef Suffix : CandidateBiarchLibDirs) {
2286	const std::string LibDir = Prefix + Suffix.str();
2287	if (!VFS.exists(Path: LibDir))
2288	continue;
2289	bool GCCDirExists = VFS.exists(Path: LibDir + "/gcc");
2290	bool GCCCrossDirExists = VFS.exists(Path: LibDir + "/gcc-cross");
2291	for (StringRef Candidate : CandidateBiarchTripleAliases)
2292	ScanLibDirForGCCTriple(TargetArch: TargetTriple, Args, LibDir, CandidateTriple: Candidate, NeedsBiarchSuffix: true,
2293	GCCDirExists, GCCCrossDirExists);
2294	}
2295
2296	// Skip other prefixes once a GCC installation is found.
2297	if (Version > VersionZero)
2298	break;
2299	}
2300	}
2301
2302	void Generic_GCC::GCCInstallationDetector::print(raw_ostream &OS) const {
2303	for (const auto &InstallPath : CandidateGCCInstallPaths)
2304	OS << "Found candidate GCC installation: " << InstallPath << "\n";
2305
2306	if (!GCCInstallPath.empty())
2307	OS << "Selected GCC installation: " << GCCInstallPath << "\n";
2308
2309	for (const auto &Multilib : Multilibs)
2310	OS << "Candidate multilib: " << Multilib << "\n";
2311
2312	if (Multilibs.size() != 0 || !SelectedMultilib.isDefault())
2313	OS << "Selected multilib: " << SelectedMultilib << "\n";
2314	}
2315
2316	bool Generic_GCC::GCCInstallationDetector::getBiarchSibling(Multilib &M) const {
2317	if (BiarchSibling) {
2318	M = *BiarchSibling;
2319	return true;
2320	}
2321	return false;
2322	}
2323
2324	void Generic_GCC::GCCInstallationDetector::AddDefaultGCCPrefixes(
2325	const llvm::Triple &TargetTriple, SmallVectorImpl<std::string> &Prefixes,
2326	StringRef SysRoot) {
2327
2328	if (TargetTriple.isOSHaiku()) {
2329	Prefixes.push_back(Elt: concat(Path: SysRoot, A: "/boot/system/develop/tools"));
2330	return;
2331	}
2332
2333	if (TargetTriple.isOSSolaris()) {
2334	// Solaris is a special case.
2335	// The GCC installation is under
2336	// /usr/gcc/<major>.<minor>/lib/gcc/<triple>/<major>.<minor>.<patch>/
2337	// so we need to find those /usr/gcc/*/lib/gcc libdirs and go with
2338	// /usr/gcc/<version> as a prefix.
2339
2340	SmallVector<std::pair<GCCVersion, std::string>, 8> SolarisPrefixes;
2341	std::string PrefixDir = concat(Path: SysRoot, A: "/usr/gcc");
2342	std::error_code EC;
2343	for (llvm::vfs::directory_iterator LI = D.getVFS().dir_begin(Dir: PrefixDir, EC),
2344	LE;
2345	!EC && LI != LE; LI = LI.increment(EC)) {
2346	StringRef VersionText = llvm::sys::path::filename(path: LI->path());
2347	GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2348
2349	// Filter out obviously bad entries.
2350	if (CandidateVersion.Major == -1 || CandidateVersion.isOlderThan(RHSMajor: 4, RHSMinor: 1, RHSPatch: 1))
2351	continue;
2352
2353	std::string CandidatePrefix = PrefixDir + "/" + VersionText.str();
2354	std::string CandidateLibPath = CandidatePrefix + "/lib/gcc";
2355	if (!D.getVFS().exists(Path: CandidateLibPath))
2356	continue;
2357
2358	SolarisPrefixes.emplace_back(
2359	Args: std::make_pair(x&: CandidateVersion, y&: CandidatePrefix));
2360	}
2361	// Sort in reverse order so GCCInstallationDetector::init picks the latest.
2362	std::sort(first: SolarisPrefixes.rbegin(), last: SolarisPrefixes.rend());
2363	for (auto p : SolarisPrefixes)
2364	Prefixes.emplace_back(Args&: p.second);
2365	return;
2366	}
2367
2368	// For Linux, if --sysroot is not specified, look for RHEL/CentOS devtoolsets
2369	// and gcc-toolsets.
2370	if (SysRoot.empty() && TargetTriple.getOS() == llvm::Triple::Linux &&
2371	D.getVFS().exists(Path: "/opt/rh")) {
2372	// TODO: We may want to remove this, since the functionality
2373	// can be achieved using config files.
2374	Prefixes.push_back(Elt: "/opt/rh/gcc-toolset-12/root/usr");
2375	Prefixes.push_back(Elt: "/opt/rh/gcc-toolset-11/root/usr");
2376	Prefixes.push_back(Elt: "/opt/rh/gcc-toolset-10/root/usr");
2377	Prefixes.push_back(Elt: "/opt/rh/devtoolset-12/root/usr");
2378	Prefixes.push_back(Elt: "/opt/rh/devtoolset-11/root/usr");
2379	Prefixes.push_back(Elt: "/opt/rh/devtoolset-10/root/usr");
2380	Prefixes.push_back(Elt: "/opt/rh/devtoolset-9/root/usr");
2381	Prefixes.push_back(Elt: "/opt/rh/devtoolset-8/root/usr");
2382	Prefixes.push_back(Elt: "/opt/rh/devtoolset-7/root/usr");
2383	Prefixes.push_back(Elt: "/opt/rh/devtoolset-6/root/usr");
2384	Prefixes.push_back(Elt: "/opt/rh/devtoolset-4/root/usr");
2385	Prefixes.push_back(Elt: "/opt/rh/devtoolset-3/root/usr");
2386	Prefixes.push_back(Elt: "/opt/rh/devtoolset-2/root/usr");
2387	}
2388
2389	// Fall back to /usr which is used by most non-Solaris systems.
2390	Prefixes.push_back(Elt: concat(Path: SysRoot, A: "/usr"));
2391	}
2392
2393	/*static*/ void Generic_GCC::GCCInstallationDetector::CollectLibDirsAndTriples(
2394	const llvm::Triple &TargetTriple, const llvm::Triple &BiarchTriple,
2395	SmallVectorImpl<StringRef> &LibDirs,
2396	SmallVectorImpl<StringRef> &TripleAliases,
2397	SmallVectorImpl<StringRef> &BiarchLibDirs,
2398	SmallVectorImpl<StringRef> &BiarchTripleAliases) {
2399	// Declare a bunch of static data sets that we'll select between below. These
2400	// are specifically designed to always refer to string literals to avoid any
2401	// lifetime or initialization issues.
2402	//
2403	// The *Triples variables hard code some triples so that, for example,
2404	// --target=aarch64 (incomplete triple) can detect lib/aarch64-linux-gnu.
2405	// They are not needed when the user has correct LLVM_DEFAULT_TARGET_TRIPLE
2406	// and always uses the full --target (e.g. --target=aarch64-linux-gnu). The
2407	// lists should shrink over time. Please don't add more elements to *Triples.
2408	static const char *const AArch64LibDirs[] = {"/lib64", "/lib"};
2409	static const char *const AArch64Triples[] = {
2410	"aarch64-none-linux-gnu", "aarch64-redhat-linux", "aarch64-suse-linux"};
2411	static const char *const AArch64beLibDirs[] = {"/lib"};
2412	static const char *const AArch64beTriples[] = {"aarch64_be-none-linux-gnu"};
2413
2414	static const char *const ARMLibDirs[] = {"/lib"};
2415	static const char *const ARMTriples[] = {"arm-linux-gnueabi"};
2416	static const char *const ARMHFTriples[] = {"arm-linux-gnueabihf",
2417	"armv7hl-redhat-linux-gnueabi",
2418	"armv6hl-suse-linux-gnueabi",
2419	"armv7hl-suse-linux-gnueabi"};
2420	static const char *const ARMebLibDirs[] = {"/lib"};
2421	static const char *const ARMebTriples[] = {"armeb-linux-gnueabi"};
2422	static const char *const ARMebHFTriples[] = {
2423	"armeb-linux-gnueabihf", "armebv7hl-redhat-linux-gnueabi"};
2424
2425	static const char *const AVRLibDirs[] = {"/lib"};
2426	static const char *const AVRTriples[] = {"avr"};
2427
2428	static const char *const CSKYLibDirs[] = {"/lib"};
2429	static const char *const CSKYTriples[] = {
2430	"csky-linux-gnuabiv2", "csky-linux-uclibcabiv2", "csky-elf-noneabiv2"};
2431
2432	static const char *const X86_64LibDirs[] = {"/lib64", "/lib"};
2433	static const char *const X86_64Triples[] = {
2434	"x86_64-linux-gnu", "x86_64-unknown-linux-gnu",
2435	"x86_64-pc-linux-gnu", "x86_64-redhat-linux6E",
2436	"x86_64-redhat-linux", "x86_64-suse-linux",
2437	"x86_64-manbo-linux-gnu", "x86_64-slackware-linux",
2438	"x86_64-unknown-linux", "x86_64-amazon-linux"};
2439	static const char *const X32Triples[] = {"x86_64-linux-gnux32",
2440	"x86_64-pc-linux-gnux32"};
2441	static const char *const X32LibDirs[] = {"/libx32", "/lib"};
2442	static const char *const X86LibDirs[] = {"/lib32", "/lib"};
2443	static const char *const X86Triples[] = {
2444	"i586-linux-gnu", "i686-linux-gnu", "i686-pc-linux-gnu",
2445	"i386-redhat-linux6E", "i686-redhat-linux", "i386-redhat-linux",
2446	"i586-suse-linux", "i686-montavista-linux",
2447	};
2448
2449	static const char *const LoongArch64LibDirs[] = {"/lib64", "/lib"};
2450	static const char *const LoongArch64Triples[] = {
2451	"loongarch64-linux-gnu", "loongarch64-unknown-linux-gnu"};
2452
2453	static const char *const M68kLibDirs[] = {"/lib"};
2454	static const char *const M68kTriples[] = {"m68k-unknown-linux-gnu",
2455	"m68k-suse-linux"};
2456
2457	static const char *const MIPSLibDirs[] = {"/libo32", "/lib"};
2458	static const char *const MIPSTriples[] = {
2459	"mips-linux-gnu", "mips-mti-linux", "mips-mti-linux-gnu",
2460	"mips-img-linux-gnu", "mipsisa32r6-linux-gnu"};
2461	static const char *const MIPSELLibDirs[] = {"/libo32", "/lib"};
2462	static const char *const MIPSELTriples[] = {"mipsel-linux-gnu",
2463	"mips-img-linux-gnu"};
2464
2465	static const char *const MIPS64LibDirs[] = {"/lib64", "/lib"};
2466	static const char *const MIPS64Triples[] = {
2467	"mips-mti-linux-gnu", "mips-img-linux-gnu", "mips64-linux-gnuabi64",
2468	"mipsisa64r6-linux-gnu", "mipsisa64r6-linux-gnuabi64"};
2469	static const char *const MIPS64ELLibDirs[] = {"/lib64", "/lib"};
2470	static const char *const MIPS64ELTriples[] = {
2471	"mips-mti-linux-gnu", "mips-img-linux-gnu", "mips64el-linux-gnuabi64",
2472	"mipsisa64r6el-linux-gnu", "mipsisa64r6el-linux-gnuabi64"};
2473
2474	static const char *const MIPSN32LibDirs[] = {"/lib32"};
2475	static const char *const MIPSN32Triples[] = {"mips64-linux-gnuabin32",
2476	"mipsisa64r6-linux-gnuabin32"};
2477	static const char *const MIPSN32ELLibDirs[] = {"/lib32"};
2478	static const char *const MIPSN32ELTriples[] = {
2479	"mips64el-linux-gnuabin32", "mipsisa64r6el-linux-gnuabin32"};
2480
2481	static const char *const MSP430LibDirs[] = {"/lib"};
2482	static const char *const MSP430Triples[] = {"msp430-elf"};
2483
2484	static const char *const PPCLibDirs[] = {"/lib32", "/lib"};
2485	static const char *const PPCTriples[] = {
2486	"powerpc-unknown-linux-gnu",
2487	// On 32-bit PowerPC systems running SUSE Linux, gcc is configured as a
2488	// 64-bit compiler which defaults to "-m32", hence "powerpc64-suse-linux".
2489	"powerpc64-suse-linux", "powerpc-montavista-linuxspe"};
2490	static const char *const PPCLELibDirs[] = {"/lib32", "/lib"};
2491	static const char *const PPCLETriples[] = {"powerpcle-unknown-linux-gnu",
2492	"powerpcle-linux-musl"};
2493
2494	static const char *const PPC64LibDirs[] = {"/lib64", "/lib"};
2495	static const char *const PPC64Triples[] = {"powerpc64-unknown-linux-gnu",
2496	"powerpc64-suse-linux",
2497	"ppc64-redhat-linux"};
2498	static const char *const PPC64LELibDirs[] = {"/lib64", "/lib"};
2499	static const char *const PPC64LETriples[] = {
2500	"powerpc64le-unknown-linux-gnu", "powerpc64le-none-linux-gnu",
2501	"powerpc64le-suse-linux", "ppc64le-redhat-linux"};
2502
2503	static const char *const RISCV32LibDirs[] = {"/lib32", "/lib"};
2504	static const char *const RISCV32Triples[] = {"riscv32-unknown-linux-gnu",
2505	"riscv32-unknown-elf"};
2506	static const char *const RISCV64LibDirs[] = {"/lib64", "/lib"};
2507	static const char *const RISCV64Triples[] = {"riscv64-unknown-linux-gnu",
2508	"riscv64-unknown-elf"};
2509
2510	static const char *const SPARCv8LibDirs[] = {"/lib32", "/lib"};
2511	static const char *const SPARCv8Triples[] = {"sparc-linux-gnu",
2512	"sparcv8-linux-gnu"};
2513	static const char *const SPARCv9LibDirs[] = {"/lib64", "/lib"};
2514	static const char *const SPARCv9Triples[] = {"sparc64-linux-gnu",
2515	"sparcv9-linux-gnu"};
2516
2517	static const char *const SystemZLibDirs[] = {"/lib64", "/lib"};
2518	static const char *const SystemZTriples[] = {
2519	"s390x-unknown-linux-gnu", "s390x-ibm-linux-gnu", "s390x-suse-linux",
2520	"s390x-redhat-linux"};
2521
2522	using std::begin;
2523	using std::end;
2524
2525	if (TargetTriple.isOSSolaris()) {
2526	static const char *const SolarisLibDirs[] = {"/lib"};
2527	static const char *const SolarisSparcV8Triples[] = {
2528	"sparc-sun-solaris2.11"};
2529	static const char *const SolarisSparcV9Triples[] = {
2530	"sparcv9-sun-solaris2.11"};
2531	static const char *const SolarisX86Triples[] = {"i386-pc-solaris2.11"};
2532	static const char *const SolarisX86_64Triples[] = {"x86_64-pc-solaris2.11"};
2533	LibDirs.append(in_start: begin(arr: SolarisLibDirs), in_end: end(arr: SolarisLibDirs));
2534	BiarchLibDirs.append(in_start: begin(arr: SolarisLibDirs), in_end: end(arr: SolarisLibDirs));
2535	switch (TargetTriple.getArch()) {
2536	case llvm::Triple::x86:
2537	TripleAliases.append(in_start: begin(arr: SolarisX86Triples), in_end: end(arr: SolarisX86Triples));
2538	BiarchTripleAliases.append(in_start: begin(arr: SolarisX86_64Triples),
2539	in_end: end(arr: SolarisX86_64Triples));
2540	break;
2541	case llvm::Triple::x86_64:
2542	TripleAliases.append(in_start: begin(arr: SolarisX86_64Triples),
2543	in_end: end(arr: SolarisX86_64Triples));
2544	BiarchTripleAliases.append(in_start: begin(arr: SolarisX86Triples),
2545	in_end: end(arr: SolarisX86Triples));
2546	break;
2547	case llvm::Triple::sparc:
2548	TripleAliases.append(in_start: begin(arr: SolarisSparcV8Triples),
2549	in_end: end(arr: SolarisSparcV8Triples));
2550	BiarchTripleAliases.append(in_start: begin(arr: SolarisSparcV9Triples),
2551	in_end: end(arr: SolarisSparcV9Triples));
2552	break;
2553	case llvm::Triple::sparcv9:
2554	TripleAliases.append(in_start: begin(arr: SolarisSparcV9Triples),
2555	in_end: end(arr: SolarisSparcV9Triples));
2556	BiarchTripleAliases.append(in_start: begin(arr: SolarisSparcV8Triples),
2557	in_end: end(arr: SolarisSparcV8Triples));
2558	break;
2559	default:
2560	break;
2561	}
2562	return;
2563	}
2564
2565	// Android targets should not use GNU/Linux tools or libraries.
2566	if (TargetTriple.isAndroid()) {
2567	static const char *const AArch64AndroidTriples[] = {
2568	"aarch64-linux-android"};
2569	static const char *const ARMAndroidTriples[] = {"arm-linux-androideabi"};
2570	static const char *const X86AndroidTriples[] = {"i686-linux-android"};
2571	static const char *const X86_64AndroidTriples[] = {"x86_64-linux-android"};
2572
2573	switch (TargetTriple.getArch()) {
2574	case llvm::Triple::aarch64:
2575	LibDirs.append(in_start: begin(arr: AArch64LibDirs), in_end: end(arr: AArch64LibDirs));
2576	TripleAliases.append(in_start: begin(arr: AArch64AndroidTriples),
2577	in_end: end(arr: AArch64AndroidTriples));
2578	break;
2579	case llvm::Triple::arm:
2580	case llvm::Triple::thumb:
2581	LibDirs.append(in_start: begin(arr: ARMLibDirs), in_end: end(arr: ARMLibDirs));
2582	TripleAliases.append(in_start: begin(arr: ARMAndroidTriples), in_end: end(arr: ARMAndroidTriples));
2583	break;
2584	case llvm::Triple::x86_64:
2585	LibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2586	TripleAliases.append(in_start: begin(arr: X86_64AndroidTriples),
2587	in_end: end(arr: X86_64AndroidTriples));
2588	BiarchLibDirs.append(in_start: begin(arr: X86LibDirs), in_end: end(arr: X86LibDirs));
2589	BiarchTripleAliases.append(in_start: begin(arr: X86AndroidTriples),
2590	in_end: end(arr: X86AndroidTriples));
2591	break;
2592	case llvm::Triple::x86:
2593	LibDirs.append(in_start: begin(arr: X86LibDirs), in_end: end(arr: X86LibDirs));
2594	TripleAliases.append(in_start: begin(arr: X86AndroidTriples), in_end: end(arr: X86AndroidTriples));
2595	BiarchLibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2596	BiarchTripleAliases.append(in_start: begin(arr: X86_64AndroidTriples),
2597	in_end: end(arr: X86_64AndroidTriples));
2598	break;
2599	default:
2600	break;
2601	}
2602
2603	return;
2604	}
2605
2606	if (TargetTriple.isOSHurd()) {
2607	switch (TargetTriple.getArch()) {
2608	case llvm::Triple::x86_64:
2609	LibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2610	TripleAliases.push_back(Elt: "x86_64-gnu");
2611	break;
2612	case llvm::Triple::x86:
2613	LibDirs.append(in_start: begin(arr: X86LibDirs), in_end: end(arr: X86LibDirs));
2614	TripleAliases.push_back(Elt: "i686-gnu");
2615	break;
2616	default:
2617	break;
2618	}
2619
2620	return;
2621	}
2622
2623	if (TargetTriple.isWindowsCygwinEnvironment()) {
2624	LibDirs.push_back(Elt: "/lib");
2625	switch (TargetTriple.getArch()) {
2626	case llvm::Triple::x86_64:
2627	TripleAliases.append(IL: {"x86_64-pc-cygwin", "x86_64-pc-msys"});
2628	break;
2629	case llvm::Triple::x86:
2630	TripleAliases.append(IL: {"i686-pc-cygwin", "i686-pc-msys"});
2631	break;
2632	default:
2633	break;
2634	}
2635
2636	return;
2637	}
2638
2639	switch (TargetTriple.getArch()) {
2640	case llvm::Triple::aarch64:
2641	LibDirs.append(in_start: begin(arr: AArch64LibDirs), in_end: end(arr: AArch64LibDirs));
2642	TripleAliases.append(in_start: begin(arr: AArch64Triples), in_end: end(arr: AArch64Triples));
2643	BiarchLibDirs.append(in_start: begin(arr: AArch64LibDirs), in_end: end(arr: AArch64LibDirs));
2644	BiarchTripleAliases.append(in_start: begin(arr: AArch64Triples), in_end: end(arr: AArch64Triples));
2645	break;
2646	case llvm::Triple::aarch64_be:
2647	LibDirs.append(in_start: begin(arr: AArch64beLibDirs), in_end: end(arr: AArch64beLibDirs));
2648	TripleAliases.append(in_start: begin(arr: AArch64beTriples), in_end: end(arr: AArch64beTriples));
2649	BiarchLibDirs.append(in_start: begin(arr: AArch64beLibDirs), in_end: end(arr: AArch64beLibDirs));
2650	BiarchTripleAliases.append(in_start: begin(arr: AArch64beTriples), in_end: end(arr: AArch64beTriples));
2651	break;
2652	case llvm::Triple::arm:
2653	case llvm::Triple::thumb:
2654	LibDirs.append(in_start: begin(arr: ARMLibDirs), in_end: end(arr: ARMLibDirs));
2655	if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF ||
2656	TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHFT64 ||
2657	TargetTriple.getEnvironment() == llvm::Triple::MuslEABIHF ||
2658	TargetTriple.getEnvironment() == llvm::Triple::EABIHF) {
2659	TripleAliases.append(in_start: begin(arr: ARMHFTriples), in_end: end(arr: ARMHFTriples));
2660	} else {
2661	TripleAliases.append(in_start: begin(arr: ARMTriples), in_end: end(arr: ARMTriples));
2662	}
2663	break;
2664	case llvm::Triple::armeb:
2665	case llvm::Triple::thumbeb:
2666	LibDirs.append(in_start: begin(arr: ARMebLibDirs), in_end: end(arr: ARMebLibDirs));
2667	if (TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHF ||
2668	TargetTriple.getEnvironment() == llvm::Triple::GNUEABIHFT64 ||
2669	TargetTriple.getEnvironment() == llvm::Triple::MuslEABIHF ||
2670	TargetTriple.getEnvironment() == llvm::Triple::EABIHF) {
2671	TripleAliases.append(in_start: begin(arr: ARMebHFTriples), in_end: end(arr: ARMebHFTriples));
2672	} else {
2673	TripleAliases.append(in_start: begin(arr: ARMebTriples), in_end: end(arr: ARMebTriples));
2674	}
2675	break;
2676	case llvm::Triple::avr:
2677	LibDirs.append(in_start: begin(arr: AVRLibDirs), in_end: end(arr: AVRLibDirs));
2678	TripleAliases.append(in_start: begin(arr: AVRTriples), in_end: end(arr: AVRTriples));
2679	break;
2680	case llvm::Triple::csky:
2681	LibDirs.append(in_start: begin(arr: CSKYLibDirs), in_end: end(arr: CSKYLibDirs));
2682	TripleAliases.append(in_start: begin(arr: CSKYTriples), in_end: end(arr: CSKYTriples));
2683	break;
2684	case llvm::Triple::x86_64:
2685	if (TargetTriple.isX32()) {
2686	LibDirs.append(in_start: begin(arr: X32LibDirs), in_end: end(arr: X32LibDirs));
2687	TripleAliases.append(in_start: begin(arr: X32Triples), in_end: end(arr: X32Triples));
2688	BiarchLibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2689	BiarchTripleAliases.append(in_start: begin(arr: X86_64Triples), in_end: end(arr: X86_64Triples));
2690	} else {
2691	LibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2692	TripleAliases.append(in_start: begin(arr: X86_64Triples), in_end: end(arr: X86_64Triples));
2693	BiarchLibDirs.append(in_start: begin(arr: X32LibDirs), in_end: end(arr: X32LibDirs));
2694	BiarchTripleAliases.append(in_start: begin(arr: X32Triples), in_end: end(arr: X32Triples));
2695	}
2696	BiarchLibDirs.append(in_start: begin(arr: X86LibDirs), in_end: end(arr: X86LibDirs));
2697	BiarchTripleAliases.append(in_start: begin(arr: X86Triples), in_end: end(arr: X86Triples));
2698	break;
2699	case llvm::Triple::x86:
2700	LibDirs.append(in_start: begin(arr: X86LibDirs), in_end: end(arr: X86LibDirs));
2701	// MCU toolchain is 32 bit only and its triple alias is TargetTriple
2702	// itself, which will be appended below.
2703	if (!TargetTriple.isOSIAMCU()) {
2704	TripleAliases.append(in_start: begin(arr: X86Triples), in_end: end(arr: X86Triples));
2705	BiarchLibDirs.append(in_start: begin(arr: X86_64LibDirs), in_end: end(arr: X86_64LibDirs));
2706	BiarchTripleAliases.append(in_start: begin(arr: X86_64Triples), in_end: end(arr: X86_64Triples));
2707	BiarchLibDirs.append(in_start: begin(arr: X32LibDirs), in_end: end(arr: X32LibDirs));
2708	BiarchTripleAliases.append(in_start: begin(arr: X32Triples), in_end: end(arr: X32Triples));
2709	}
2710	break;
2711	// TODO: Handle loongarch32.
2712	case llvm::Triple::loongarch64:
2713	LibDirs.append(in_start: begin(arr: LoongArch64LibDirs), in_end: end(arr: LoongArch64LibDirs));
2714	TripleAliases.append(in_start: begin(arr: LoongArch64Triples), in_end: end(arr: LoongArch64Triples));
2715	break;
2716	case llvm::Triple::m68k:
2717	LibDirs.append(in_start: begin(arr: M68kLibDirs), in_end: end(arr: M68kLibDirs));
2718	TripleAliases.append(in_start: begin(arr: M68kTriples), in_end: end(arr: M68kTriples));
2719	break;
2720	case llvm::Triple::mips:
2721	LibDirs.append(in_start: begin(arr: MIPSLibDirs), in_end: end(arr: MIPSLibDirs));
2722	TripleAliases.append(in_start: begin(arr: MIPSTriples), in_end: end(arr: MIPSTriples));
2723	BiarchLibDirs.append(in_start: begin(arr: MIPS64LibDirs), in_end: end(arr: MIPS64LibDirs));
2724	BiarchTripleAliases.append(in_start: begin(arr: MIPS64Triples), in_end: end(arr: MIPS64Triples));
2725	BiarchLibDirs.append(in_start: begin(arr: MIPSN32LibDirs), in_end: end(arr: MIPSN32LibDirs));
2726	BiarchTripleAliases.append(in_start: begin(arr: MIPSN32Triples), in_end: end(arr: MIPSN32Triples));
2727	break;
2728	case llvm::Triple::mipsel:
2729	LibDirs.append(in_start: begin(arr: MIPSELLibDirs), in_end: end(arr: MIPSELLibDirs));
2730	TripleAliases.append(in_start: begin(arr: MIPSELTriples), in_end: end(arr: MIPSELTriples));
2731	TripleAliases.append(in_start: begin(arr: MIPSTriples), in_end: end(arr: MIPSTriples));
2732	BiarchLibDirs.append(in_start: begin(arr: MIPS64ELLibDirs), in_end: end(arr: MIPS64ELLibDirs));
2733	BiarchTripleAliases.append(in_start: begin(arr: MIPS64ELTriples), in_end: end(arr: MIPS64ELTriples));
2734	BiarchLibDirs.append(in_start: begin(arr: MIPSN32ELLibDirs), in_end: end(arr: MIPSN32ELLibDirs));
2735	BiarchTripleAliases.append(in_start: begin(arr: MIPSN32ELTriples), in_end: end(arr: MIPSN32ELTriples));
2736	break;
2737	case llvm::Triple::mips64:
2738	LibDirs.append(in_start: begin(arr: MIPS64LibDirs), in_end: end(arr: MIPS64LibDirs));
2739	TripleAliases.append(in_start: begin(arr: MIPS64Triples), in_end: end(arr: MIPS64Triples));
2740	BiarchLibDirs.append(in_start: begin(arr: MIPSLibDirs), in_end: end(arr: MIPSLibDirs));
2741	BiarchTripleAliases.append(in_start: begin(arr: MIPSTriples), in_end: end(arr: MIPSTriples));
2742	BiarchLibDirs.append(in_start: begin(arr: MIPSN32LibDirs), in_end: end(arr: MIPSN32LibDirs));
2743	BiarchTripleAliases.append(in_start: begin(arr: MIPSN32Triples), in_end: end(arr: MIPSN32Triples));
2744	break;
2745	case llvm::Triple::mips64el:
2746	LibDirs.append(in_start: begin(arr: MIPS64ELLibDirs), in_end: end(arr: MIPS64ELLibDirs));
2747	TripleAliases.append(in_start: begin(arr: MIPS64ELTriples), in_end: end(arr: MIPS64ELTriples));
2748	BiarchLibDirs.append(in_start: begin(arr: MIPSELLibDirs), in_end: end(arr: MIPSELLibDirs));
2749	BiarchTripleAliases.append(in_start: begin(arr: MIPSELTriples), in_end: end(arr: MIPSELTriples));
2750	BiarchLibDirs.append(in_start: begin(arr: MIPSN32ELLibDirs), in_end: end(arr: MIPSN32ELLibDirs));
2751	BiarchTripleAliases.append(in_start: begin(arr: MIPSN32ELTriples), in_end: end(arr: MIPSN32ELTriples));
2752	BiarchTripleAliases.append(in_start: begin(arr: MIPSTriples), in_end: end(arr: MIPSTriples));
2753	break;
2754	case llvm::Triple::msp430:
2755	LibDirs.append(in_start: begin(arr: MSP430LibDirs), in_end: end(arr: MSP430LibDirs));
2756	TripleAliases.append(in_start: begin(arr: MSP430Triples), in_end: end(arr: MSP430Triples));
2757	break;
2758	case llvm::Triple::ppc:
2759	LibDirs.append(in_start: begin(arr: PPCLibDirs), in_end: end(arr: PPCLibDirs));
2760	TripleAliases.append(in_start: begin(arr: PPCTriples), in_end: end(arr: PPCTriples));
2761	BiarchLibDirs.append(in_start: begin(arr: PPC64LibDirs), in_end: end(arr: PPC64LibDirs));
2762	BiarchTripleAliases.append(in_start: begin(arr: PPC64Triples), in_end: end(arr: PPC64Triples));
2763	break;
2764	case llvm::Triple::ppcle:
2765	LibDirs.append(in_start: begin(arr: PPCLELibDirs), in_end: end(arr: PPCLELibDirs));
2766	TripleAliases.append(in_start: begin(arr: PPCLETriples), in_end: end(arr: PPCLETriples));
2767	BiarchLibDirs.append(in_start: begin(arr: PPC64LELibDirs), in_end: end(arr: PPC64LELibDirs));
2768	BiarchTripleAliases.append(in_start: begin(arr: PPC64LETriples), in_end: end(arr: PPC64LETriples));
2769	break;
2770	case llvm::Triple::ppc64:
2771	LibDirs.append(in_start: begin(arr: PPC64LibDirs), in_end: end(arr: PPC64LibDirs));
2772	TripleAliases.append(in_start: begin(arr: PPC64Triples), in_end: end(arr: PPC64Triples));
2773	BiarchLibDirs.append(in_start: begin(arr: PPCLibDirs), in_end: end(arr: PPCLibDirs));
2774	BiarchTripleAliases.append(in_start: begin(arr: PPCTriples), in_end: end(arr: PPCTriples));
2775	break;
2776	case llvm::Triple::ppc64le:
2777	LibDirs.append(in_start: begin(arr: PPC64LELibDirs), in_end: end(arr: PPC64LELibDirs));
2778	TripleAliases.append(in_start: begin(arr: PPC64LETriples), in_end: end(arr: PPC64LETriples));
2779	BiarchLibDirs.append(in_start: begin(arr: PPCLELibDirs), in_end: end(arr: PPCLELibDirs));
2780	BiarchTripleAliases.append(in_start: begin(arr: PPCLETriples), in_end: end(arr: PPCLETriples));
2781	break;
2782	case llvm::Triple::riscv32:
2783	LibDirs.append(in_start: begin(arr: RISCV32LibDirs), in_end: end(arr: RISCV32LibDirs));
2784	TripleAliases.append(in_start: begin(arr: RISCV32Triples), in_end: end(arr: RISCV32Triples));
2785	BiarchLibDirs.append(in_start: begin(arr: RISCV64LibDirs), in_end: end(arr: RISCV64LibDirs));
2786	BiarchTripleAliases.append(in_start: begin(arr: RISCV64Triples), in_end: end(arr: RISCV64Triples));
2787	break;
2788	case llvm::Triple::riscv64:
2789	LibDirs.append(in_start: begin(arr: RISCV64LibDirs), in_end: end(arr: RISCV64LibDirs));
2790	TripleAliases.append(in_start: begin(arr: RISCV64Triples), in_end: end(arr: RISCV64Triples));
2791	BiarchLibDirs.append(in_start: begin(arr: RISCV32LibDirs), in_end: end(arr: RISCV32LibDirs));
2792	BiarchTripleAliases.append(in_start: begin(arr: RISCV32Triples), in_end: end(arr: RISCV32Triples));
2793	break;
2794	case llvm::Triple::sparc:
2795	case llvm::Triple::sparcel:
2796	LibDirs.append(in_start: begin(arr: SPARCv8LibDirs), in_end: end(arr: SPARCv8LibDirs));
2797	TripleAliases.append(in_start: begin(arr: SPARCv8Triples), in_end: end(arr: SPARCv8Triples));
2798	BiarchLibDirs.append(in_start: begin(arr: SPARCv9LibDirs), in_end: end(arr: SPARCv9LibDirs));
2799	BiarchTripleAliases.append(in_start: begin(arr: SPARCv9Triples), in_end: end(arr: SPARCv9Triples));
2800	break;
2801	case llvm::Triple::sparcv9:
2802	LibDirs.append(in_start: begin(arr: SPARCv9LibDirs), in_end: end(arr: SPARCv9LibDirs));
2803	TripleAliases.append(in_start: begin(arr: SPARCv9Triples), in_end: end(arr: SPARCv9Triples));
2804	BiarchLibDirs.append(in_start: begin(arr: SPARCv8LibDirs), in_end: end(arr: SPARCv8LibDirs));
2805	BiarchTripleAliases.append(in_start: begin(arr: SPARCv8Triples), in_end: end(arr: SPARCv8Triples));
2806	break;
2807	case llvm::Triple::systemz:
2808	LibDirs.append(in_start: begin(arr: SystemZLibDirs), in_end: end(arr: SystemZLibDirs));
2809	TripleAliases.append(in_start: begin(arr: SystemZTriples), in_end: end(arr: SystemZTriples));
2810	break;
2811	default:
2812	// By default, just rely on the standard lib directories and the original
2813	// triple.
2814	break;
2815	}
2816
2817	// Also include the multiarch variant if it's different.
2818	if (TargetTriple.str() != BiarchTriple.str())
2819	BiarchTripleAliases.push_back(Elt: BiarchTriple.str());
2820	}
2821
2822	bool Generic_GCC::GCCInstallationDetector::ScanGCCForMultilibs(
2823	const llvm::Triple &TargetTriple, const ArgList &Args,
2824	StringRef Path, bool NeedsBiarchSuffix) {
2825	llvm::Triple::ArchType TargetArch = TargetTriple.getArch();
2826	DetectedMultilibs Detected;
2827
2828	// Android standalone toolchain could have multilibs for ARM and Thumb.
2829	// Debian mips multilibs behave more like the rest of the biarch ones,
2830	// so handle them there
2831	if (isArmOrThumbArch(Arch: TargetArch) && TargetTriple.isAndroid()) {
2832	// It should also work without multilibs in a simplified toolchain.
2833	findAndroidArmMultilibs(D, TargetTriple, Path, Args, Result&: Detected);
2834	} else if (TargetTriple.isCSKY()) {
2835	findCSKYMultilibs(D, TargetTriple, Path, Args, Result&: Detected);
2836	} else if (TargetTriple.isMIPS()) {
2837	if (!findMIPSMultilibs(D, TargetTriple, Path, Args, Result&: Detected))
2838	return false;
2839	} else if (TargetTriple.isRISCV()) {
2840	findRISCVMultilibs(D, TargetTriple, Path, Args, Result&: Detected);
2841	} else if (isMSP430(Arch: TargetArch)) {
2842	findMSP430Multilibs(D, TargetTriple, Path, Args, Result&: Detected);
2843	} else if (TargetArch == llvm::Triple::avr) {
2844	// AVR has no multilibs.
2845	} else if (!findBiarchMultilibs(D, TargetTriple, Path, Args,
2846	NeedsBiarchSuffix, Result&: Detected)) {
2847	return false;
2848	}
2849
2850	Multilibs = Detected.Multilibs;
2851	SelectedMultilib = Detected.SelectedMultilibs.empty()
2852	? Multilib()
2853	: Detected.SelectedMultilibs.back();
2854	BiarchSibling = Detected.BiarchSibling;
2855
2856	return true;
2857	}
2858
2859	void Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(
2860	const llvm::Triple &TargetTriple, const ArgList &Args,
2861	const std::string &LibDir, StringRef CandidateTriple,
2862	bool NeedsBiarchSuffix, bool GCCDirExists, bool GCCCrossDirExists) {
2863	// Locations relative to the system lib directory where GCC's triple-specific
2864	// directories might reside.
2865	struct GCCLibSuffix {
2866	// Path from system lib directory to GCC triple-specific directory.
2867	std::string LibSuffix;
2868	// Path from GCC triple-specific directory back to system lib directory.
2869	// This is one '..' component per component in LibSuffix.
2870	StringRef ReversePath;
2871	// Whether this library suffix is relevant for the triple.
2872	bool Active;
2873	} Suffixes[] = {
2874	// This is the normal place.
2875	{.LibSuffix: "gcc/" + CandidateTriple.str(), .ReversePath: "../..", .Active: GCCDirExists},
2876
2877	// Debian puts cross-compilers in gcc-cross.
2878	{.LibSuffix: "gcc-cross/" + CandidateTriple.str(), .ReversePath: "../..", .Active: GCCCrossDirExists},
2879
2880	// The Freescale PPC SDK has the gcc libraries in
2881	// <sysroot>/usr/lib/<triple>/x.y.z so have a look there as well. Only do
2882	// this on Freescale triples, though, since some systems put a *lot* of
2883	// files in that location, not just GCC installation data.
2884	{.LibSuffix: CandidateTriple.str(), .ReversePath: "..",
2885	.Active: TargetTriple.getVendor() == llvm::Triple::Freescale ||
2886	TargetTriple.getVendor() == llvm::Triple::OpenEmbedded}};
2887
2888	for (auto &Suffix : Suffixes) {
2889	if (!Suffix.Active)
2890	continue;
2891
2892	StringRef LibSuffix = Suffix.LibSuffix;
2893	std::error_code EC;
2894	for (llvm::vfs::directory_iterator
2895	LI = D.getVFS().dir_begin(Dir: LibDir + "/" + LibSuffix, EC),
2896	LE;
2897	!EC && LI != LE; LI = LI.increment(EC)) {
2898	StringRef VersionText = llvm::sys::path::filename(path: LI->path());
2899	GCCVersion CandidateVersion = GCCVersion::Parse(VersionText);
2900	if (CandidateVersion.Major != -1) // Filter obviously bad entries.
2901	if (!CandidateGCCInstallPaths.insert(x: std::string(LI->path())).second)
2902	continue; // Saw this path before; no need to look at it again.
2903	if (CandidateVersion.isOlderThan(RHSMajor: 4, RHSMinor: 1, RHSPatch: 1))
2904	continue;
2905	if (CandidateVersion <= Version)
2906	continue;
2907
2908	if (!ScanGCCForMultilibs(TargetTriple, Args, Path: LI->path(),
2909	NeedsBiarchSuffix))
2910	continue;
2911
2912	Version = CandidateVersion;
2913	GCCTriple.setTriple(CandidateTriple);
2914	// FIXME: We hack together the directory name here instead of
2915	// using LI to ensure stable path separators across Windows and
2916	// Linux.
2917	GCCInstallPath = (LibDir + "/" + LibSuffix + "/" + VersionText).str();
2918	GCCParentLibPath = (GCCInstallPath + "/../" + Suffix.ReversePath).str();
2919	IsValid = true;
2920	}
2921	}
2922	}
2923
2924	bool Generic_GCC::GCCInstallationDetector::ScanGentooConfigs(
2925	const llvm::Triple &TargetTriple, const ArgList &Args,
2926	const SmallVectorImpl<StringRef> &CandidateTriples,
2927	const SmallVectorImpl<StringRef> &CandidateBiarchTriples) {
2928	if (!D.getVFS().exists(Path: concat(Path: D.SysRoot, A: GentooConfigDir)))
2929	return false;
2930
2931	for (StringRef CandidateTriple : CandidateTriples) {
2932	if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple))
2933	return true;
2934	}
2935
2936	for (StringRef CandidateTriple : CandidateBiarchTriples) {
2937	if (ScanGentooGccConfig(TargetTriple, Args, CandidateTriple, NeedsBiarchSuffix: true))
2938	return true;
2939	}
2940	return false;
2941	}
2942
2943	bool Generic_GCC::GCCInstallationDetector::ScanGentooGccConfig(
2944	const llvm::Triple &TargetTriple, const ArgList &Args,
2945	StringRef CandidateTriple, bool NeedsBiarchSuffix) {
2946	llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> File =
2947	D.getVFS().getBufferForFile(Name: concat(Path: D.SysRoot, A: GentooConfigDir,
2948	B: "/config-" + CandidateTriple.str()));
2949	if (File) {
2950	SmallVector<StringRef, 2> Lines;
2951	File.get()->getBuffer().split(A&: Lines, Separator: "\n");
2952	for (StringRef Line : Lines) {
2953	Line = Line.trim();
2954	// CURRENT=triple-version
2955	if (!Line.consume_front(Prefix: "CURRENT="))
2956	continue;
2957	// Process the config file pointed to by CURRENT.
2958	llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> ConfigFile =
2959	D.getVFS().getBufferForFile(
2960	Name: concat(Path: D.SysRoot, A: GentooConfigDir, B: "/" + Line));
2961	std::pair<StringRef, StringRef> ActiveVersion = Line.rsplit(Separator: '-');
2962	// List of paths to scan for libraries.
2963	SmallVector<StringRef, 4> GentooScanPaths;
2964	// Scan the Config file to find installed GCC libraries path.
2965	// Typical content of the GCC config file:
2966	// LDPATH="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x:/usr/lib/gcc/
2967	// (continued from previous line) x86_64-pc-linux-gnu/4.9.x/32"
2968	// MANPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/man"
2969	// INFOPATH="/usr/share/gcc-data/x86_64-pc-linux-gnu/4.9.x/info"
2970	// STDCXX_INCDIR="/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.x/include/g++-v4"
2971	// We are looking for the paths listed in LDPATH=... .
2972	if (ConfigFile) {
2973	SmallVector<StringRef, 2> ConfigLines;
2974	ConfigFile.get()->getBuffer().split(A&: ConfigLines, Separator: "\n");
2975	for (StringRef ConfLine : ConfigLines) {
2976	ConfLine = ConfLine.trim();
2977	if (ConfLine.consume_front(Prefix: "LDPATH=")) {
2978	// Drop '"' from front and back if present.
2979	ConfLine.consume_back(Suffix: "\"");
2980	ConfLine.consume_front(Prefix: "\"");
2981	// Get all paths sperated by ':'
2982	ConfLine.split(A&: GentooScanPaths, Separator: ':', MaxSplit: -1, /*AllowEmpty*/ KeepEmpty: false);
2983	}
2984	}
2985	}
2986	// Test the path based on the version in /etc/env.d/gcc/config-{tuple}.
2987	std::string basePath = "/usr/lib/gcc/" + ActiveVersion.first.str() + "/"
2988	+ ActiveVersion.second.str();
2989	GentooScanPaths.push_back(Elt: StringRef(basePath));
2990
2991	// Scan all paths for GCC libraries.
2992	for (const auto &GentooScanPath : GentooScanPaths) {
2993	std::string GentooPath = concat(Path: D.SysRoot, A: GentooScanPath);
2994	if (D.getVFS().exists(Path: GentooPath + "/crtbegin.o")) {
2995	if (!ScanGCCForMultilibs(TargetTriple, Args, Path: GentooPath,
2996	NeedsBiarchSuffix))
2997	continue;
2998
2999	Version = GCCVersion::Parse(VersionText: ActiveVersion.second);
3000	GCCInstallPath = GentooPath;
3001	GCCParentLibPath = GentooPath + std::string("/../../..");
3002	GCCTriple.setTriple(ActiveVersion.first);
3003	IsValid = true;
3004	return true;
3005	}
3006	}
3007	}
3008	}
3009
3010	return false;
3011	}
3012
3013	Generic_GCC::Generic_GCC(const Driver &D, const llvm::Triple &Triple,
3014	const ArgList &Args)
3015	: ToolChain(D, Triple, Args), GCCInstallation(D),
3016	CudaInstallation(D, Triple, Args), RocmInstallation(D, Triple, Args),
3017	SYCLInstallation(D, Triple, Args) {
3018	getProgramPaths().push_back(Elt: getDriver().Dir);
3019	}
3020
3021	Generic_GCC::~Generic_GCC() {}
3022
3023	Tool *Generic_GCC::getTool(Action::ActionClass AC) const {
3024	switch (AC) {
3025	case Action::PreprocessJobClass:
3026	if (!Preprocess)
3027	Preprocess.reset(p: new clang::driver::tools::gcc::Preprocessor(*this));
3028	return Preprocess.get();
3029	case Action::CompileJobClass:
3030	if (!Compile)
3031	Compile.reset(p: new tools::gcc::Compiler(*this));
3032	return Compile.get();
3033	default:
3034	return ToolChain::getTool(AC);
3035	}
3036	}
3037
3038	Tool *Generic_GCC::buildAssembler() const {
3039	return new tools::gnutools::Assembler(*this);
3040	}
3041
3042	Tool *Generic_GCC::buildLinker() const { return new tools::gcc::Linker(*this); }
3043
3044	void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
3045	// Print the information about how we detected the GCC installation.
3046	GCCInstallation.print(OS);
3047	CudaInstallation->print(OS);
3048	RocmInstallation->print(OS);
3049	}
3050
3051	ToolChain::UnwindTableLevel
3052	Generic_GCC::getDefaultUnwindTableLevel(const ArgList &Args) const {
3053	switch (getArch()) {
3054	case llvm::Triple::aarch64:
3055	case llvm::Triple::aarch64_be:
3056	case llvm::Triple::ppc:
3057	case llvm::Triple::ppcle:
3058	case llvm::Triple::ppc64:
3059	case llvm::Triple::ppc64le:
3060	case llvm::Triple::riscv32:
3061	case llvm::Triple::riscv64:
3062	case llvm::Triple::x86:
3063	case llvm::Triple::x86_64:
3064	return UnwindTableLevel::Asynchronous;
3065	default:
3066	return UnwindTableLevel::None;
3067	}
3068	}
3069
3070	bool Generic_GCC::isPICDefault() const {
3071	switch (getArch()) {
3072	case llvm::Triple::x86_64:
3073	return getTriple().isOSWindows();
3074	case llvm::Triple::mips64:
3075	case llvm::Triple::mips64el:
3076	return true;
3077	default:
3078	return false;
3079	}
3080	}
3081
3082	bool Generic_GCC::isPIEDefault(const llvm::opt::ArgList &Args) const {
3083	return false;
3084	}
3085
3086	bool Generic_GCC::isPICDefaultForced() const {
3087	return getArch() == llvm::Triple::x86_64 && getTriple().isOSWindows();
3088	}
3089
3090	bool Generic_GCC::IsIntegratedAssemblerDefault() const {
3091	switch (getTriple().getArch()) {
3092	case llvm::Triple::nvptx:
3093	case llvm::Triple::nvptx64:
3094	case llvm::Triple::xcore:
3095	return false;
3096	default:
3097	return true;
3098	}
3099	}
3100
3101	void Generic_GCC::PushPPaths(ToolChain::path_list &PPaths) {
3102	// Cross-compiling binutils and GCC installations (vanilla and openSUSE at
3103	// least) put various tools in a triple-prefixed directory off of the parent
3104	// of the GCC installation. We use the GCC triple here to ensure that we end
3105	// up with tools that support the same amount of cross compiling as the
3106	// detected GCC installation. For example, if we find a GCC installation
3107	// targeting x86_64, but it is a bi-arch GCC installation, it can also be
3108	// used to target i386.
3109	if (GCCInstallation.isValid()) {
3110	PPaths.push_back(Elt: Twine(GCCInstallation.getParentLibPath() + "/../" +
3111	GCCInstallation.getTriple().str() + "/bin")
3112	.str());
3113	}
3114	}
3115
3116	void Generic_GCC::AddMultilibPaths(const Driver &D,
3117	const std::string &SysRoot,
3118	const std::string &OSLibDir,
3119	const std::string &MultiarchTriple,
3120	path_list &Paths) {
3121	// Add the multilib suffixed paths where they are available.
3122	if (GCCInstallation.isValid()) {
3123	assert(!SelectedMultilibs.empty());
3124	const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
3125	const std::string &LibPath =
3126	std::string(GCCInstallation.getParentLibPath());
3127
3128	// Sourcery CodeBench MIPS toolchain holds some libraries under
3129	// a biarch-like suffix of the GCC installation.
3130	if (const auto &PathsCallback = Multilibs.filePathsCallback())
3131	for (const auto &Path : PathsCallback(SelectedMultilibs.back()))
3132	addPathIfExists(D, Path: GCCInstallation.getInstallPath() + Path, Paths);
3133
3134	// Add lib/gcc/$triple/$version, with an optional /multilib suffix.
3135	addPathIfExists(D,
3136	Path: GCCInstallation.getInstallPath() +
3137	SelectedMultilibs.back().gccSuffix(),
3138	Paths);
3139
3140	// Add lib/gcc/$triple/$libdir
3141	// For GCC built with --enable-version-specific-runtime-libs.
3142	addPathIfExists(D, Path: GCCInstallation.getInstallPath() + "/../" + OSLibDir,
3143	Paths);
3144
3145	// GCC cross compiling toolchains will install target libraries which ship
3146	// as part of the toolchain under <prefix>/<triple>/<libdir> rather than as
3147	// any part of the GCC installation in
3148	// <prefix>/<libdir>/gcc/<triple>/<version>. This decision is somewhat
3149	// debatable, but is the reality today. We need to search this tree even
3150	// when we have a sysroot somewhere else. It is the responsibility of
3151	// whomever is doing the cross build targeting a sysroot using a GCC
3152	// installation that is *not* within the system root to ensure two things:
3153	//
3154	// 1) Any DSOs that are linked in from this tree or from the install path
3155	// above must be present on the system root and found via an
3156	// appropriate rpath.
3157	// 2) There must not be libraries installed into
3158	// <prefix>/<triple>/<libdir> unless they should be preferred over
3159	// those within the system root.
3160	//
3161	// Note that this matches the GCC behavior. See the below comment for where
3162	// Clang diverges from GCC's behavior.
3163	addPathIfExists(D,
3164	Path: LibPath + "/../" + GCCTriple.str() + "/lib/../" + OSLibDir +
3165	SelectedMultilibs.back().osSuffix(),
3166	Paths);
3167
3168	// If the GCC installation we found is inside of the sysroot, we want to
3169	// prefer libraries installed in the parent prefix of the GCC installation.
3170	// It is important to *not* use these paths when the GCC installation is
3171	// outside of the system root as that can pick up unintended libraries.
3172	// This usually happens when there is an external cross compiler on the
3173	// host system, and a more minimal sysroot available that is the target of
3174	// the cross. Note that GCC does include some of these directories in some
3175	// configurations but this seems somewhere between questionable and simply
3176	// a bug.
3177	if (StringRef(LibPath).starts_with(Prefix: SysRoot))
3178	addPathIfExists(D, Path: LibPath + "/../" + OSLibDir, Paths);
3179	}
3180	}
3181
3182	void Generic_GCC::AddMultiarchPaths(const Driver &D,
3183	const std::string &SysRoot,
3184	const std::string &OSLibDir,
3185	path_list &Paths) {
3186	if (GCCInstallation.isValid()) {
3187	const std::string &LibPath =
3188	std::string(GCCInstallation.getParentLibPath());
3189	const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
3190	const Multilib &Multilib = GCCInstallation.getMultilib();
3191	addPathIfExists(
3192	D, Path: LibPath + "/../" + GCCTriple.str() + "/lib" + Multilib.osSuffix(),
3193	Paths);
3194	}
3195	}
3196
3197	void Generic_GCC::AddMultilibIncludeArgs(const ArgList &DriverArgs,
3198	ArgStringList &CC1Args) const {
3199	// Add include directories specific to the selected multilib set and multilib.
3200	if (!GCCInstallation.isValid())
3201	return;
3202	// gcc TOOL_INCLUDE_DIR.
3203	const llvm::Triple &GCCTriple = GCCInstallation.getTriple();
3204	std::string LibPath(GCCInstallation.getParentLibPath());
3205	addSystemInclude(DriverArgs, CC1Args,
3206	Path: Twine(LibPath) + "/../" + GCCTriple.str() + "/include");
3207
3208	const auto &Callback = Multilibs.includeDirsCallback();
3209	if (Callback) {
3210	for (const auto &Path : Callback(GCCInstallation.getMultilib()))
3211	addExternCSystemIncludeIfExists(DriverArgs, CC1Args,
3212	Path: GCCInstallation.getInstallPath() + Path);
3213	}
3214	}
3215
3216	void Generic_GCC::AddClangCXXStdlibIncludeArgs(const ArgList &DriverArgs,
3217	ArgStringList &CC1Args) const {
3218	if (DriverArgs.hasArg(options::OPT_nostdinc, options::OPT_nostdincxx,
3219	options::OPT_nostdlibinc))
3220	return;
3221
3222	switch (GetCXXStdlibType(Args: DriverArgs)) {
3223	case ToolChain::CST_Libcxx:
3224	addLibCxxIncludePaths(DriverArgs, CC1Args);
3225	break;
3226
3227	case ToolChain::CST_Libstdcxx:
3228	addLibStdCxxIncludePaths(DriverArgs, CC1Args);
3229	break;
3230	}
3231	}
3232
3233	void Generic_GCC::addSYCLIncludeArgs(const ArgList &DriverArgs,
3234	ArgStringList &CC1Args) const {
3235	SYCLInstallation->addSYCLIncludeArgs(DriverArgs, CC1Args);
3236	}
3237
3238	void
3239	Generic_GCC::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
3240	llvm::opt::ArgStringList &CC1Args) const {
3241	const Driver &D = getDriver();
3242	std::string SysRoot = computeSysRoot();
3243	if (SysRoot.empty())
3244	SysRoot = llvm::sys::path::get_separator();
3245
3246	auto AddIncludePath = [&](StringRef Path, bool TargetDirRequired = false) {
3247	std::string Version = detectLibcxxVersion(IncludePath: Path);
3248	if (Version.empty())
3249	return false;
3250
3251	// First add the per-target include path if it exists.
3252	bool TargetDirExists = false;
3253	std::optional<std::string> TargetIncludeDir = getTargetSubDirPath(BaseDir: Path);
3254	if (TargetIncludeDir) {
3255	SmallString<128> TargetDir(*TargetIncludeDir);
3256	llvm::sys::path::append(path&: TargetDir, a: "c++", b: Version);
3257	if (D.getVFS().exists(Path: TargetDir)) {
3258	addSystemInclude(DriverArgs, CC1Args, Path: TargetDir);
3259	TargetDirExists = true;
3260	}
3261	}
3262	if (TargetDirRequired && !TargetDirExists)
3263	return false;
3264
3265	// Second add the generic one.
3266	SmallString<128> GenericDir(Path);
3267	llvm::sys::path::append(path&: GenericDir, a: "c++", b: Version);
3268	addSystemInclude(DriverArgs, CC1Args, Path: GenericDir);
3269	return true;
3270	};
3271
3272	// Android only uses the libc++ headers installed alongside the toolchain if
3273	// they contain an Android-specific target include path, otherwise they're
3274	// incompatible with the NDK libraries.
3275	SmallString<128> DriverIncludeDir(getDriver().Dir);
3276	llvm::sys::path::append(path&: DriverIncludeDir, a: "..", b: "include");
3277	if (AddIncludePath(DriverIncludeDir,
3278	/*TargetDirRequired=*/getTriple().isAndroid()))
3279	return;
3280	// If this is a development, non-installed, clang, libcxx will
3281	// not be found at ../include/c++ but it likely to be found at
3282	// one of the following two locations:
3283	SmallString<128> UsrLocalIncludeDir(SysRoot);
3284	llvm::sys::path::append(path&: UsrLocalIncludeDir, a: "usr", b: "local", c: "include");
3285	if (AddIncludePath(UsrLocalIncludeDir))
3286	return;
3287	SmallString<128> UsrIncludeDir(SysRoot);
3288	llvm::sys::path::append(path&: UsrIncludeDir, a: "usr", b: "include");
3289	if (AddIncludePath(UsrIncludeDir))
3290	return;
3291	}
3292
3293	bool Generic_GCC::addLibStdCXXIncludePaths(Twine IncludeDir, StringRef Triple,
3294	Twine IncludeSuffix,
3295	const llvm::opt::ArgList &DriverArgs,
3296	llvm::opt::ArgStringList &CC1Args,
3297	bool DetectDebian) const {
3298	if (!getVFS().exists(Path: IncludeDir))
3299	return false;
3300
3301	// Debian native gcc uses g++-multiarch-incdir.diff which uses
3302	// include/x86_64-linux-gnu/c++/10$IncludeSuffix instead of
3303	// include/c++/10/x86_64-linux-gnu$IncludeSuffix.
3304	std::string Dir = IncludeDir.str();
3305	StringRef Include =
3306	llvm::sys::path::parent_path(path: llvm::sys::path::parent_path(path: Dir));
3307	std::string Path =
3308	(Include + "/" + Triple + Dir.substr(pos: Include.size()) + IncludeSuffix)
3309	.str();
3310	if (DetectDebian && !getVFS().exists(Path))
3311	return false;
3312
3313	// GPLUSPLUS_INCLUDE_DIR
3314	addSystemInclude(DriverArgs, CC1Args, Path: IncludeDir);
3315	// GPLUSPLUS_TOOL_INCLUDE_DIR. If Triple is not empty, add a target-dependent
3316	// include directory.
3317	if (DetectDebian)
3318	addSystemInclude(DriverArgs, CC1Args, Path);
3319	else if (!Triple.empty())
3320	addSystemInclude(DriverArgs, CC1Args,
3321	Path: IncludeDir + "/" + Triple + IncludeSuffix);
3322	// GPLUSPLUS_BACKWARD_INCLUDE_DIR
3323	addSystemInclude(DriverArgs, CC1Args, Path: IncludeDir + "/backward");
3324	return true;
3325	}
3326
3327	bool Generic_GCC::addGCCLibStdCxxIncludePaths(
3328	const llvm::opt::ArgList &DriverArgs, llvm::opt::ArgStringList &CC1Args,
3329	StringRef DebianMultiarch) const {
3330	assert(GCCInstallation.isValid());
3331
3332	// By default, look for the C++ headers in an include directory adjacent to
3333	// the lib directory of the GCC installation. Note that this is expect to be
3334	// equivalent to '/usr/include/c++/X.Y' in almost all cases.
3335	StringRef LibDir = GCCInstallation.getParentLibPath();
3336	StringRef InstallDir = GCCInstallation.getInstallPath();
3337	StringRef TripleStr = GCCInstallation.getTriple().str();
3338	const Multilib &Multilib = GCCInstallation.getMultilib();
3339	const GCCVersion &Version = GCCInstallation.getVersion();
3340
3341	// Try /../$triple/include/c++/$version (gcc --print-multiarch is not empty).
3342	if (addLibStdCXXIncludePaths(
3343	IncludeDir: LibDir.str() + "/../" + TripleStr + "/include/c++/" + Version.Text,
3344	Triple: TripleStr, IncludeSuffix: Multilib.includeSuffix(), DriverArgs, CC1Args))
3345	return true;
3346
3347	// Try /gcc/$triple/$version/include/c++/ (gcc --print-multiarch is not
3348	// empty). Like above but for GCC built with
3349	// --enable-version-specific-runtime-libs.
3350	if (addLibStdCXXIncludePaths(IncludeDir: LibDir.str() + "/gcc/" + TripleStr + "/" +
3351	Version.Text + "/include/c++/",
3352	Triple: TripleStr, IncludeSuffix: Multilib.includeSuffix(), DriverArgs,
3353	CC1Args))
3354	return true;
3355
3356	// Detect Debian g++-multiarch-incdir.diff.
3357	if (addLibStdCXXIncludePaths(IncludeDir: LibDir.str() + "/../include/c++/" + Version.Text,
3358	Triple: DebianMultiarch, IncludeSuffix: Multilib.includeSuffix(),
3359	DriverArgs, CC1Args, /*Debian=*/DetectDebian: true))
3360	return true;
3361
3362	// Try /../include/c++/$version (gcc --print-multiarch is empty).
3363	if (addLibStdCXXIncludePaths(IncludeDir: LibDir.str() + "/../include/c++/" + Version.Text,
3364	Triple: TripleStr, IncludeSuffix: Multilib.includeSuffix(), DriverArgs,
3365	CC1Args))
3366	return true;
3367
3368	// Otherwise, fall back on a bunch of options which don't use multiarch
3369	// layouts for simplicity.
3370	const std::string LibStdCXXIncludePathCandidates[] = {
3371	// Gentoo is weird and places its headers inside the GCC install,
3372	// so if the first attempt to find the headers fails, try these patterns.
3373	InstallDir.str() + "/include/g++-v" + Version.Text,
3374	InstallDir.str() + "/include/g++-v" + Version.MajorStr + "." +
3375	Version.MinorStr,
3376	InstallDir.str() + "/include/g++-v" + Version.MajorStr,
3377	};
3378
3379	for (const auto &IncludePath : LibStdCXXIncludePathCandidates) {
3380	if (addLibStdCXXIncludePaths(IncludeDir: IncludePath, Triple: TripleStr,
3381	IncludeSuffix: Multilib.includeSuffix(), DriverArgs, CC1Args))
3382	return true;
3383	}
3384	return false;
3385	}
3386
3387	void
3388	Generic_GCC::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
3389	llvm::opt::ArgStringList &CC1Args) const {
3390	if (GCCInstallation.isValid()) {
3391	addGCCLibStdCxxIncludePaths(DriverArgs, CC1Args,
3392	DebianMultiarch: GCCInstallation.getTriple().str());
3393	}
3394	}
3395
3396	llvm::opt::DerivedArgList *
3397	Generic_GCC::TranslateArgs(const llvm::opt::DerivedArgList &Args,
3398	StringRef BoundArch,
3399	Action::OffloadKind DeviceOffloadKind) const {
3400	if (DeviceOffloadKind != Action::OFK_SYCL &&
3401	DeviceOffloadKind != Action::OFK_OpenMP)
3402	return nullptr;
3403
3404	DerivedArgList *DAL = new DerivedArgList(Args.getBaseArgs());
3405
3406	// Filter all the arguments we don't care passing to the offloading
3407	// toolchain as they can mess up with the creation of a shared library.
3408	const llvm::DenseSet<unsigned> OpenMPFiltered{
3409	options::OPT_shared, options::OPT_dynamic, options::OPT_static,
3410	options::OPT_fPIE, options::OPT_fno_PIE, options::OPT_fpie,
3411	options::OPT_fno_pie};
3412	for (auto *A : Args)
3413	if (DeviceOffloadKind != Action::OFK_OpenMP ||
3414	!OpenMPFiltered.contains(V: A->getOption().getID()))
3415	DAL->append(A);
3416
3417	// Request a shared library for CPU offloading. Given that these options
3418	// are decided implicitly, they do not refer to any base argument.
3419	const OptTable &Opts = getDriver().getOpts();
3420	if (DeviceOffloadKind == Action::OFK_OpenMP) {
3421	DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_shared));
3422	DAL->AddFlagArg(/*BaseArg=*/nullptr, Opts.getOption(options::OPT_fPIC));
3423	}
3424
3425	// Add the bound architecture to the arguments list if present.
3426	if (!BoundArch.empty()) {
3427	options::ID Opt =
3428	getTriple().isARM() || getTriple().isPPC() || getTriple().isAArch64()
3429	? options::OPT_mcpu_EQ
3430	: options::OPT_march_EQ;
3431	DAL->eraseArg(Id: Opt);
3432	DAL->AddJoinedArg(BaseArg: nullptr, Opt: Opts.getOption(Opt), Value: BoundArch);
3433	}
3434	return DAL;
3435	}
3436
3437	void Generic_ELF::anchor() {}
3438
3439	void Generic_ELF::addClangTargetOptions(const ArgList &DriverArgs,
3440	ArgStringList &CC1Args,
3441	Action::OffloadKind) const {
3442	if (!DriverArgs.hasFlag(options::OPT_fuse_init_array,
3443	options::OPT_fno_use_init_array, true))
3444	CC1Args.push_back(Elt: "-fno-use-init-array");
3445	}
3446