1//===--- Driver.cpp - Clang GCC Compatible Driver -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "clang/Driver/Driver.h"
11#include "InputInfo.h"
12#include "ToolChains.h"
13#include "clang/Basic/Version.h"
14#include "clang/Driver/Action.h"
15#include "clang/Driver/Arg.h"
16#include "clang/Driver/ArgList.h"
17#include "clang/Driver/Compilation.h"
18#include "clang/Driver/DriverDiagnostic.h"
19#include "clang/Driver/Job.h"
20#include "clang/Driver/OptTable.h"
21#include "clang/Driver/Option.h"
22#include "clang/Driver/Options.h"
23#include "clang/Driver/Tool.h"
24#include "clang/Driver/ToolChain.h"
25#include "llvm/ADT/ArrayRef.h"
26#include "llvm/ADT/OwningPtr.h"
27#include "llvm/ADT/StringSet.h"
28#include "llvm/Support/Debug.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/FileSystem.h"
31#include "llvm/Support/Path.h"
32#include "llvm/Support/PrettyStackTrace.h"
33#include "llvm/Support/Program.h"
34#include "llvm/Support/raw_ostream.h"
35#include <map>
36
37// FIXME: It would prevent us from including llvm-config.h
38// if config.h were included before system_error.h.
39#include "clang/Config/config.h"
40
41using namespace clang::driver;
42using namespace clang;
43
44Driver::Driver(StringRef ClangExecutable,
45               StringRef DefaultTargetTriple,
46               StringRef DefaultImageName,
47               DiagnosticsEngine &Diags)
48  : Opts(createDriverOptTable()), Diags(Diags),
49    ClangExecutable(ClangExecutable), SysRoot(DEFAULT_SYSROOT),
50    UseStdLib(true), DefaultTargetTriple(DefaultTargetTriple),
51    DefaultImageName(DefaultImageName),
52    DriverTitle("clang LLVM compiler"),
53    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0),
54    CCLogDiagnosticsFilename(0), CCCIsCXX(false),
55    CCCIsCPP(false),CCCEcho(false), CCCPrintBindings(false),
56    CCPrintOptions(false), CCPrintHeaders(false), CCLogDiagnostics(false),
57    CCGenDiagnostics(false), CCCGenericGCCName(""), CheckInputsExist(true),
58    CCCUsePCH(true), SuppressMissingInputWarning(false) {
59
60  Name = llvm::sys::path::stem(ClangExecutable);
61  Dir  = llvm::sys::path::parent_path(ClangExecutable);
62}
63
64Driver::~Driver() {
65  delete Opts;
66
67  for (llvm::StringMap<ToolChain *>::iterator I = ToolChains.begin(),
68                                              E = ToolChains.end();
69       I != E; ++I)
70    delete I->second;
71}
72
73InputArgList *Driver::ParseArgStrings(ArrayRef<const char *> ArgList) {
74  llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
75  unsigned MissingArgIndex, MissingArgCount;
76  InputArgList *Args = getOpts().ParseArgs(ArgList.begin(), ArgList.end(),
77                                           MissingArgIndex, MissingArgCount);
78
79  // Check for missing argument error.
80  if (MissingArgCount)
81    Diag(clang::diag::err_drv_missing_argument)
82      << Args->getArgString(MissingArgIndex) << MissingArgCount;
83
84  // Check for unsupported options.
85  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
86       it != ie; ++it) {
87    Arg *A = *it;
88    if (A->getOption().hasFlag(options::Unsupported)) {
89      Diag(clang::diag::err_drv_unsupported_opt) << A->getAsString(*Args);
90      continue;
91    }
92
93    // Warn about -mcpu= without an argument.
94    if (A->getOption().matches(options::OPT_mcpu_EQ) &&
95        A->containsValue("")) {
96      Diag(clang::diag::warn_drv_empty_joined_argument) <<
97        A->getAsString(*Args);
98    }
99  }
100
101  return Args;
102}
103
104// Determine which compilation mode we are in. We look for options which
105// affect the phase, starting with the earliest phases, and record which
106// option we used to determine the final phase.
107phases::ID Driver::getFinalPhase(const DerivedArgList &DAL, Arg **FinalPhaseArg)
108const {
109  Arg *PhaseArg = 0;
110  phases::ID FinalPhase;
111
112  // -{E,M,MM} only run the preprocessor.
113  if (CCCIsCPP ||
114      (PhaseArg = DAL.getLastArg(options::OPT_E)) ||
115      (PhaseArg = DAL.getLastArg(options::OPT_M, options::OPT_MM))) {
116    FinalPhase = phases::Preprocess;
117
118    // -{fsyntax-only,-analyze,emit-ast,S} only run up to the compiler.
119  } else if ((PhaseArg = DAL.getLastArg(options::OPT_fsyntax_only)) ||
120             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_objc)) ||
121             (PhaseArg = DAL.getLastArg(options::OPT_rewrite_legacy_objc)) ||
122             (PhaseArg = DAL.getLastArg(options::OPT__migrate)) ||
123             (PhaseArg = DAL.getLastArg(options::OPT__analyze,
124                                        options::OPT__analyze_auto)) ||
125             (PhaseArg = DAL.getLastArg(options::OPT_emit_ast)) ||
126             (PhaseArg = DAL.getLastArg(options::OPT_S))) {
127    FinalPhase = phases::Compile;
128
129    // -c only runs up to the assembler.
130  } else if ((PhaseArg = DAL.getLastArg(options::OPT_c))) {
131    FinalPhase = phases::Assemble;
132
133    // Otherwise do everything.
134  } else
135    FinalPhase = phases::Link;
136
137  if (FinalPhaseArg)
138    *FinalPhaseArg = PhaseArg;
139
140  return FinalPhase;
141}
142
143DerivedArgList *Driver::TranslateInputArgs(const InputArgList &Args) const {
144  DerivedArgList *DAL = new DerivedArgList(Args);
145
146  bool HasNostdlib = Args.hasArg(options::OPT_nostdlib);
147  for (ArgList::const_iterator it = Args.begin(),
148         ie = Args.end(); it != ie; ++it) {
149    const Arg *A = *it;
150
151    // Unfortunately, we have to parse some forwarding options (-Xassembler,
152    // -Xlinker, -Xpreprocessor) because we either integrate their functionality
153    // (assembler and preprocessor), or bypass a previous driver ('collect2').
154
155    // Rewrite linker options, to replace --no-demangle with a custom internal
156    // option.
157    if ((A->getOption().matches(options::OPT_Wl_COMMA) ||
158         A->getOption().matches(options::OPT_Xlinker)) &&
159        A->containsValue("--no-demangle")) {
160      // Add the rewritten no-demangle argument.
161      DAL->AddFlagArg(A, Opts->getOption(options::OPT_Z_Xlinker__no_demangle));
162
163      // Add the remaining values as Xlinker arguments.
164      for (unsigned i = 0, e = A->getNumValues(); i != e; ++i)
165        if (StringRef(A->getValue(i)) != "--no-demangle")
166          DAL->AddSeparateArg(A, Opts->getOption(options::OPT_Xlinker),
167                              A->getValue(i));
168
169      continue;
170    }
171
172    // Rewrite preprocessor options, to replace -Wp,-MD,FOO which is used by
173    // some build systems. We don't try to be complete here because we don't
174    // care to encourage this usage model.
175    if (A->getOption().matches(options::OPT_Wp_COMMA) &&
176        (A->getValue(0) == StringRef("-MD") ||
177         A->getValue(0) == StringRef("-MMD"))) {
178      // Rewrite to -MD/-MMD along with -MF.
179      if (A->getValue(0) == StringRef("-MD"))
180        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MD));
181      else
182        DAL->AddFlagArg(A, Opts->getOption(options::OPT_MMD));
183      if (A->getNumValues() == 2)
184        DAL->AddSeparateArg(A, Opts->getOption(options::OPT_MF),
185                            A->getValue(1));
186      continue;
187    }
188
189    // Rewrite reserved library names.
190    if (A->getOption().matches(options::OPT_l)) {
191      StringRef Value = A->getValue();
192
193      // Rewrite unless -nostdlib is present.
194      if (!HasNostdlib && Value == "stdc++") {
195        DAL->AddFlagArg(A, Opts->getOption(
196                              options::OPT_Z_reserved_lib_stdcxx));
197        continue;
198      }
199
200      // Rewrite unconditionally.
201      if (Value == "cc_kext") {
202        DAL->AddFlagArg(A, Opts->getOption(
203                              options::OPT_Z_reserved_lib_cckext));
204        continue;
205      }
206    }
207
208    DAL->append(*it);
209  }
210
211  // Add a default value of -mlinker-version=, if one was given and the user
212  // didn't specify one.
213#if defined(HOST_LINK_VERSION)
214  if (!Args.hasArg(options::OPT_mlinker_version_EQ)) {
215    DAL->AddJoinedArg(0, Opts->getOption(options::OPT_mlinker_version_EQ),
216                      HOST_LINK_VERSION);
217    DAL->getLastArg(options::OPT_mlinker_version_EQ)->claim();
218  }
219#endif
220
221  return DAL;
222}
223
224Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
225  llvm::PrettyStackTraceString CrashInfo("Compilation construction");
226
227  // FIXME: Handle environment options which affect driver behavior, somewhere
228  // (client?). GCC_EXEC_PREFIX, LPATH, CC_PRINT_OPTIONS.
229
230  if (char *env = ::getenv("COMPILER_PATH")) {
231    StringRef CompilerPath = env;
232    while (!CompilerPath.empty()) {
233      std::pair<StringRef, StringRef> Split
234        = CompilerPath.split(llvm::sys::PathSeparator);
235      PrefixDirs.push_back(Split.first);
236      CompilerPath = Split.second;
237    }
238  }
239
240  // FIXME: What are we going to do with -V and -b?
241
242  // FIXME: This stuff needs to go into the Compilation, not the driver.
243  bool CCCPrintOptions, CCCPrintActions;
244
245  InputArgList *Args = ParseArgStrings(ArgList.slice(1));
246
247  // -no-canonical-prefixes is used very early in main.
248  Args->ClaimAllArgs(options::OPT_no_canonical_prefixes);
249
250  // Ignore -pipe.
251  Args->ClaimAllArgs(options::OPT_pipe);
252
253  // Extract -ccc args.
254  //
255  // FIXME: We need to figure out where this behavior should live. Most of it
256  // should be outside in the client; the parts that aren't should have proper
257  // options, either by introducing new ones or by overloading gcc ones like -V
258  // or -b.
259  CCCPrintOptions = Args->hasArg(options::OPT_ccc_print_options);
260  CCCPrintActions = Args->hasArg(options::OPT_ccc_print_phases);
261  CCCPrintBindings = Args->hasArg(options::OPT_ccc_print_bindings);
262  CCCIsCXX = Args->hasArg(options::OPT_ccc_cxx) || CCCIsCXX;
263  CCCEcho = Args->hasArg(options::OPT_ccc_echo);
264  if (const Arg *A = Args->getLastArg(options::OPT_ccc_gcc_name))
265    CCCGenericGCCName = A->getValue();
266  CCCUsePCH = Args->hasFlag(options::OPT_ccc_pch_is_pch,
267                            options::OPT_ccc_pch_is_pth);
268  // FIXME: DefaultTargetTriple is used by the target-prefixed calls to as/ld
269  // and getToolChain is const.
270  if (const Arg *A = Args->getLastArg(options::OPT_target))
271    DefaultTargetTriple = A->getValue();
272  if (const Arg *A = Args->getLastArg(options::OPT_ccc_install_dir))
273    Dir = InstalledDir = A->getValue();
274  for (arg_iterator it = Args->filtered_begin(options::OPT_B),
275         ie = Args->filtered_end(); it != ie; ++it) {
276    const Arg *A = *it;
277    A->claim();
278    PrefixDirs.push_back(A->getValue(0));
279  }
280  if (const Arg *A = Args->getLastArg(options::OPT__sysroot_EQ))
281    SysRoot = A->getValue();
282  if (Args->hasArg(options::OPT_nostdlib))
283    UseStdLib = false;
284
285  // Compute the path to the resource directory. We used to do this in
286  // Driver::Driver(), but that's not right, as command line args (such as
287  // ccc-install-dir) can change 'Dir'.
288  StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
289  SmallString<128> P(Dir);
290  if (!ClangResourceDir.empty())
291    llvm::sys::path::append(P, ClangResourceDir);
292  else
293    llvm::sys::path::append(P, "..", "lib", "clang", CLANG_VERSION_STRING);
294  ResourceDir = P.str();
295
296  // Perform the default argument translations.
297  DerivedArgList *TranslatedArgs = TranslateInputArgs(*Args);
298
299  // Owned by the host.
300  const ToolChain &TC = getToolChain(*Args);
301
302  // The compilation takes ownership of Args.
303  Compilation *C = new Compilation(*this, TC, Args, TranslatedArgs);
304
305  // FIXME: This behavior shouldn't be here.
306  if (CCCPrintOptions) {
307    PrintOptions(C->getInputArgs());
308    return C;
309  }
310
311  if (!HandleImmediateArgs(*C))
312    return C;
313
314  // Construct the list of inputs.
315  InputList Inputs;
316  BuildInputs(C->getDefaultToolChain(), C->getArgs(), Inputs);
317
318  // Construct the list of abstract actions to perform for this compilation. On
319  // Darwin target OSes this uses the driver-driver and universal actions.
320  if (TC.getTriple().isOSDarwin())
321    BuildUniversalActions(C->getDefaultToolChain(), C->getArgs(),
322                          Inputs, C->getActions());
323  else
324    BuildActions(C->getDefaultToolChain(), C->getArgs(), Inputs,
325                 C->getActions());
326
327  if (CCCPrintActions) {
328    PrintActions(*C);
329    return C;
330  }
331
332  BuildJobs(*C);
333
334  return C;
335}
336
337// When clang crashes, produce diagnostic information including the fully
338// preprocessed source file(s).  Request that the developer attach the
339// diagnostic information to a bug report.
340void Driver::generateCompilationDiagnostics(Compilation &C,
341                                            const Command *FailingCommand) {
342  if (C.getArgs().hasArg(options::OPT_fno_crash_diagnostics))
343    return;
344
345  // Don't try to generate diagnostics for link or dsymutil jobs.
346  if (FailingCommand && (FailingCommand->getCreator().isLinkJob() ||
347                         FailingCommand->getCreator().isDsymutilJob()))
348    return;
349
350  // Print the version of the compiler.
351  PrintVersion(C, llvm::errs());
352
353  Diag(clang::diag::note_drv_command_failed_diag_msg)
354    << "PLEASE submit a bug report to " BUG_REPORT_URL " and include the "
355    "crash backtrace, preprocessed source, and associated run script.";
356
357  // Suppress driver output and emit preprocessor output to temp file.
358  CCCIsCPP = true;
359  CCGenDiagnostics = true;
360  C.getArgs().AddFlagArg(0, Opts->getOption(options::OPT_frewrite_includes));
361
362  // Save the original job command(s).
363  std::string Cmd;
364  llvm::raw_string_ostream OS(Cmd);
365  if (FailingCommand)
366    C.PrintDiagnosticJob(OS, *FailingCommand);
367  else
368    // Crash triggered by FORCE_CLANG_DIAGNOSTICS_CRASH, which doesn't have an
369    // associated FailingCommand, so just pass all jobs.
370    C.PrintDiagnosticJob(OS, C.getJobs());
371  OS.flush();
372
373  // Keep track of whether we produce any errors while trying to produce
374  // preprocessed sources.
375  DiagnosticErrorTrap Trap(Diags);
376
377  // Suppress tool output.
378  C.initCompilationForDiagnostics();
379
380  // Construct the list of inputs.
381  InputList Inputs;
382  BuildInputs(C.getDefaultToolChain(), C.getArgs(), Inputs);
383
384  for (InputList::iterator it = Inputs.begin(), ie = Inputs.end(); it != ie;) {
385    bool IgnoreInput = false;
386
387    // Ignore input from stdin or any inputs that cannot be preprocessed.
388    if (!strcmp(it->second->getValue(), "-")) {
389      Diag(clang::diag::note_drv_command_failed_diag_msg)
390        << "Error generating preprocessed source(s) - ignoring input from stdin"
391        ".";
392      IgnoreInput = true;
393    } else if (types::getPreprocessedType(it->first) == types::TY_INVALID) {
394      IgnoreInput = true;
395    }
396
397    if (IgnoreInput) {
398      it = Inputs.erase(it);
399      ie = Inputs.end();
400    } else {
401      ++it;
402    }
403  }
404
405  if (Inputs.empty()) {
406    Diag(clang::diag::note_drv_command_failed_diag_msg)
407      << "Error generating preprocessed source(s) - no preprocessable inputs.";
408    return;
409  }
410
411  // Don't attempt to generate preprocessed files if multiple -arch options are
412  // used, unless they're all duplicates.
413  llvm::StringSet<> ArchNames;
414  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
415       it != ie; ++it) {
416    Arg *A = *it;
417    if (A->getOption().matches(options::OPT_arch)) {
418      StringRef ArchName = A->getValue();
419      ArchNames.insert(ArchName);
420    }
421  }
422  if (ArchNames.size() > 1) {
423    Diag(clang::diag::note_drv_command_failed_diag_msg)
424      << "Error generating preprocessed source(s) - cannot generate "
425      "preprocessed source with multiple -arch options.";
426    return;
427  }
428
429  // Construct the list of abstract actions to perform for this compilation. On
430  // Darwin OSes this uses the driver-driver and builds universal actions.
431  const ToolChain &TC = C.getDefaultToolChain();
432  if (TC.getTriple().isOSDarwin())
433    BuildUniversalActions(TC, C.getArgs(), Inputs, C.getActions());
434  else
435    BuildActions(TC, C.getArgs(), Inputs, C.getActions());
436
437  BuildJobs(C);
438
439  // If there were errors building the compilation, quit now.
440  if (Trap.hasErrorOccurred()) {
441    Diag(clang::diag::note_drv_command_failed_diag_msg)
442      << "Error generating preprocessed source(s).";
443    return;
444  }
445
446  // Generate preprocessed output.
447  SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
448  C.ExecuteJob(C.getJobs(), FailingCommands);
449
450  // If the command succeeded, we are done.
451  if (FailingCommands.empty()) {
452    Diag(clang::diag::note_drv_command_failed_diag_msg)
453      << "\n********************\n\n"
454      "PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:\n"
455      "Preprocessed source(s) and associated run script(s) are located at:";
456    ArgStringList Files = C.getTempFiles();
457    for (ArgStringList::const_iterator it = Files.begin(), ie = Files.end();
458         it != ie; ++it) {
459      Diag(clang::diag::note_drv_command_failed_diag_msg) << *it;
460
461      std::string Err;
462      std::string Script = StringRef(*it).rsplit('.').first;
463      Script += ".sh";
464      llvm::raw_fd_ostream ScriptOS(Script.c_str(), Err,
465                                    llvm::raw_fd_ostream::F_Excl |
466                                    llvm::raw_fd_ostream::F_Binary);
467      if (!Err.empty()) {
468        Diag(clang::diag::note_drv_command_failed_diag_msg)
469          << "Error generating run script: " + Script + " " + Err;
470      } else {
471        // Append the new filename with correct preprocessed suffix.
472        size_t I, E;
473        I = Cmd.find("-main-file-name ");
474        assert (I != std::string::npos && "Expected to find -main-file-name");
475        I += 16;
476        E = Cmd.find(" ", I);
477        assert (E != std::string::npos && "-main-file-name missing argument?");
478        StringRef OldFilename = StringRef(Cmd).slice(I, E);
479        StringRef NewFilename = llvm::sys::path::filename(*it);
480        I = StringRef(Cmd).rfind(OldFilename);
481        E = I + OldFilename.size();
482        I = Cmd.rfind(" ", I) + 1;
483        Cmd.replace(I, E - I, NewFilename.data(), NewFilename.size());
484        ScriptOS << Cmd;
485        Diag(clang::diag::note_drv_command_failed_diag_msg) << Script;
486      }
487    }
488    Diag(clang::diag::note_drv_command_failed_diag_msg)
489      << "\n\n********************";
490  } else {
491    // Failure, remove preprocessed files.
492    if (!C.getArgs().hasArg(options::OPT_save_temps)) {
493      C.CleanupFileList(C.getTempFiles(), true);
494    }
495
496    Diag(clang::diag::note_drv_command_failed_diag_msg)
497      << "Error generating preprocessed source(s).";
498  }
499}
500
501int Driver::ExecuteCompilation(const Compilation &C,
502    SmallVectorImpl< std::pair<int, const Command *> > &FailingCommands) const {
503  // Just print if -### was present.
504  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
505    C.PrintJob(llvm::errs(), C.getJobs(), "\n", true);
506    return 0;
507  }
508
509  // If there were errors building the compilation, quit now.
510  if (Diags.hasErrorOccurred())
511    return 1;
512
513  C.ExecuteJob(C.getJobs(), FailingCommands);
514
515  // Remove temp files.
516  C.CleanupFileList(C.getTempFiles());
517
518  // If the command succeeded, we are done.
519  if (FailingCommands.empty())
520    return 0;
521
522  // Otherwise, remove result files and print extra information about abnormal
523  // failures.
524  for (SmallVectorImpl< std::pair<int, const Command *> >::iterator it =
525         FailingCommands.begin(), ie = FailingCommands.end(); it != ie; ++it) {
526    int Res = it->first;
527    const Command *FailingCommand = it->second;
528
529    // Remove result files if we're not saving temps.
530    if (!C.getArgs().hasArg(options::OPT_save_temps)) {
531      const JobAction *JA = cast<JobAction>(&FailingCommand->getSource());
532      C.CleanupFileMap(C.getResultFiles(), JA, true);
533
534      // Failure result files are valid unless we crashed.
535      if (Res < 0)
536        C.CleanupFileMap(C.getFailureResultFiles(), JA, true);
537    }
538
539    // Print extra information about abnormal failures, if possible.
540    //
541    // This is ad-hoc, but we don't want to be excessively noisy. If the result
542    // status was 1, assume the command failed normally. In particular, if it
543    // was the compiler then assume it gave a reasonable error code. Failures
544    // in other tools are less common, and they generally have worse
545    // diagnostics, so always print the diagnostic there.
546    const Tool &FailingTool = FailingCommand->getCreator();
547
548    if (!FailingCommand->getCreator().hasGoodDiagnostics() || Res != 1) {
549      // FIXME: See FIXME above regarding result code interpretation.
550      if (Res < 0)
551        Diag(clang::diag::err_drv_command_signalled)
552          << FailingTool.getShortName();
553      else
554        Diag(clang::diag::err_drv_command_failed)
555          << FailingTool.getShortName() << Res;
556    }
557  }
558  return 0;
559}
560
561void Driver::PrintOptions(const ArgList &Args) const {
562  unsigned i = 0;
563  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
564       it != ie; ++it, ++i) {
565    Arg *A = *it;
566    llvm::errs() << "Option " << i << " - "
567                 << "Name: \"" << A->getOption().getPrefixedName() << "\", "
568                 << "Values: {";
569    for (unsigned j = 0; j < A->getNumValues(); ++j) {
570      if (j)
571        llvm::errs() << ", ";
572      llvm::errs() << '"' << A->getValue(j) << '"';
573    }
574    llvm::errs() << "}\n";
575  }
576}
577
578void Driver::PrintHelp(bool ShowHidden) const {
579  getOpts().PrintHelp(llvm::outs(), Name.c_str(), DriverTitle.c_str(),
580                      /*Include*/0,
581                      /*Exclude*/options::NoDriverOption |
582                      (ShowHidden ? 0 : options::HelpHidden));
583}
584
585void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
586  // FIXME: The following handlers should use a callback mechanism, we don't
587  // know what the client would like to do.
588  OS << getClangFullVersion() << '\n';
589  const ToolChain &TC = C.getDefaultToolChain();
590  OS << "Target: " << TC.getTripleString() << '\n';
591
592  // Print the threading model.
593  //
594  // FIXME: Implement correctly.
595  OS << "Thread model: " << "posix" << '\n';
596}
597
598/// PrintDiagnosticCategories - Implement the --print-diagnostic-categories
599/// option.
600static void PrintDiagnosticCategories(raw_ostream &OS) {
601  // Skip the empty category.
602  for (unsigned i = 1, max = DiagnosticIDs::getNumberOfCategories();
603       i != max; ++i)
604    OS << i << ',' << DiagnosticIDs::getCategoryNameFromID(i) << '\n';
605}
606
607bool Driver::HandleImmediateArgs(const Compilation &C) {
608  // The order these options are handled in gcc is all over the place, but we
609  // don't expect inconsistencies w.r.t. that to matter in practice.
610
611  if (C.getArgs().hasArg(options::OPT_dumpmachine)) {
612    llvm::outs() << C.getDefaultToolChain().getTripleString() << '\n';
613    return false;
614  }
615
616  if (C.getArgs().hasArg(options::OPT_dumpversion)) {
617    // Since -dumpversion is only implemented for pedantic GCC compatibility, we
618    // return an answer which matches our definition of __VERSION__.
619    //
620    // If we want to return a more correct answer some day, then we should
621    // introduce a non-pedantically GCC compatible mode to Clang in which we
622    // provide sensible definitions for -dumpversion, __VERSION__, etc.
623    llvm::outs() << "4.2.1\n";
624    return false;
625  }
626
627  if (C.getArgs().hasArg(options::OPT__print_diagnostic_categories)) {
628    PrintDiagnosticCategories(llvm::outs());
629    return false;
630  }
631
632  if (C.getArgs().hasArg(options::OPT_help) ||
633      C.getArgs().hasArg(options::OPT__help_hidden)) {
634    PrintHelp(C.getArgs().hasArg(options::OPT__help_hidden));
635    return false;
636  }
637
638  if (C.getArgs().hasArg(options::OPT__version)) {
639    // Follow gcc behavior and use stdout for --version and stderr for -v.
640    PrintVersion(C, llvm::outs());
641    return false;
642  }
643
644  if (C.getArgs().hasArg(options::OPT_v) ||
645      C.getArgs().hasArg(options::OPT__HASH_HASH_HASH)) {
646    PrintVersion(C, llvm::errs());
647    SuppressMissingInputWarning = true;
648  }
649
650  const ToolChain &TC = C.getDefaultToolChain();
651  if (C.getArgs().hasArg(options::OPT_print_search_dirs)) {
652    llvm::outs() << "programs: =";
653    for (ToolChain::path_list::const_iterator it = TC.getProgramPaths().begin(),
654           ie = TC.getProgramPaths().end(); it != ie; ++it) {
655      if (it != TC.getProgramPaths().begin())
656        llvm::outs() << ':';
657      llvm::outs() << *it;
658    }
659    llvm::outs() << "\n";
660    llvm::outs() << "libraries: =" << ResourceDir;
661
662    StringRef sysroot = C.getSysRoot();
663
664    for (ToolChain::path_list::const_iterator it = TC.getFilePaths().begin(),
665           ie = TC.getFilePaths().end(); it != ie; ++it) {
666      llvm::outs() << ':';
667      const char *path = it->c_str();
668      if (path[0] == '=')
669        llvm::outs() << sysroot << path + 1;
670      else
671        llvm::outs() << path;
672    }
673    llvm::outs() << "\n";
674    return false;
675  }
676
677  // FIXME: The following handlers should use a callback mechanism, we don't
678  // know what the client would like to do.
679  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_file_name_EQ)) {
680    llvm::outs() << GetFilePath(A->getValue(), TC) << "\n";
681    return false;
682  }
683
684  if (Arg *A = C.getArgs().getLastArg(options::OPT_print_prog_name_EQ)) {
685    llvm::outs() << GetProgramPath(A->getValue(), TC) << "\n";
686    return false;
687  }
688
689  if (C.getArgs().hasArg(options::OPT_print_libgcc_file_name)) {
690    llvm::outs() << GetFilePath("libgcc.a", TC) << "\n";
691    return false;
692  }
693
694  if (C.getArgs().hasArg(options::OPT_print_multi_lib)) {
695    // FIXME: We need tool chain support for this.
696    llvm::outs() << ".;\n";
697
698    switch (C.getDefaultToolChain().getTriple().getArch()) {
699    default:
700      break;
701
702    case llvm::Triple::x86_64:
703      llvm::outs() << "x86_64;@m64" << "\n";
704      break;
705
706    case llvm::Triple::ppc64:
707      llvm::outs() << "ppc64;@m64" << "\n";
708      break;
709    }
710    return false;
711  }
712
713  // FIXME: What is the difference between print-multi-directory and
714  // print-multi-os-directory?
715  if (C.getArgs().hasArg(options::OPT_print_multi_directory) ||
716      C.getArgs().hasArg(options::OPT_print_multi_os_directory)) {
717    switch (C.getDefaultToolChain().getTriple().getArch()) {
718    default:
719    case llvm::Triple::x86:
720    case llvm::Triple::ppc:
721      llvm::outs() << "." << "\n";
722      break;
723
724    case llvm::Triple::x86_64:
725      llvm::outs() << "x86_64" << "\n";
726      break;
727
728    case llvm::Triple::ppc64:
729      llvm::outs() << "ppc64" << "\n";
730      break;
731    }
732    return false;
733  }
734
735  return true;
736}
737
738static unsigned PrintActions1(const Compilation &C, Action *A,
739                              std::map<Action*, unsigned> &Ids) {
740  if (Ids.count(A))
741    return Ids[A];
742
743  std::string str;
744  llvm::raw_string_ostream os(str);
745
746  os << Action::getClassName(A->getKind()) << ", ";
747  if (InputAction *IA = dyn_cast<InputAction>(A)) {
748    os << "\"" << IA->getInputArg().getValue() << "\"";
749  } else if (BindArchAction *BIA = dyn_cast<BindArchAction>(A)) {
750    os << '"' << BIA->getArchName() << '"'
751       << ", {" << PrintActions1(C, *BIA->begin(), Ids) << "}";
752  } else {
753    os << "{";
754    for (Action::iterator it = A->begin(), ie = A->end(); it != ie;) {
755      os << PrintActions1(C, *it, Ids);
756      ++it;
757      if (it != ie)
758        os << ", ";
759    }
760    os << "}";
761  }
762
763  unsigned Id = Ids.size();
764  Ids[A] = Id;
765  llvm::errs() << Id << ": " << os.str() << ", "
766               << types::getTypeName(A->getType()) << "\n";
767
768  return Id;
769}
770
771void Driver::PrintActions(const Compilation &C) const {
772  std::map<Action*, unsigned> Ids;
773  for (ActionList::const_iterator it = C.getActions().begin(),
774         ie = C.getActions().end(); it != ie; ++it)
775    PrintActions1(C, *it, Ids);
776}
777
778/// \brief Check whether the given input tree contains any compilation or
779/// assembly actions.
780static bool ContainsCompileOrAssembleAction(const Action *A) {
781  if (isa<CompileJobAction>(A) || isa<AssembleJobAction>(A))
782    return true;
783
784  for (Action::const_iterator it = A->begin(), ie = A->end(); it != ie; ++it)
785    if (ContainsCompileOrAssembleAction(*it))
786      return true;
787
788  return false;
789}
790
791void Driver::BuildUniversalActions(const ToolChain &TC,
792                                   const DerivedArgList &Args,
793                                   const InputList &BAInputs,
794                                   ActionList &Actions) const {
795  llvm::PrettyStackTraceString CrashInfo("Building universal build actions");
796  // Collect the list of architectures. Duplicates are allowed, but should only
797  // be handled once (in the order seen).
798  llvm::StringSet<> ArchNames;
799  SmallVector<const char *, 4> Archs;
800  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
801       it != ie; ++it) {
802    Arg *A = *it;
803
804    if (A->getOption().matches(options::OPT_arch)) {
805      // Validate the option here; we don't save the type here because its
806      // particular spelling may participate in other driver choices.
807      llvm::Triple::ArchType Arch =
808        tools::darwin::getArchTypeForDarwinArchName(A->getValue());
809      if (Arch == llvm::Triple::UnknownArch) {
810        Diag(clang::diag::err_drv_invalid_arch_name)
811          << A->getAsString(Args);
812        continue;
813      }
814
815      A->claim();
816      if (ArchNames.insert(A->getValue()))
817        Archs.push_back(A->getValue());
818    }
819  }
820
821  // When there is no explicit arch for this platform, make sure we still bind
822  // the architecture (to the default) so that -Xarch_ is handled correctly.
823  if (!Archs.size())
824    Archs.push_back(Args.MakeArgString(TC.getDefaultUniversalArchName()));
825
826  // FIXME: We killed off some others but these aren't yet detected in a
827  // functional manner. If we added information to jobs about which "auxiliary"
828  // files they wrote then we could detect the conflict these cause downstream.
829  if (Archs.size() > 1) {
830    // No recovery needed, the point of this is just to prevent
831    // overwriting the same files.
832    if (const Arg *A = Args.getLastArg(options::OPT_save_temps))
833      Diag(clang::diag::err_drv_invalid_opt_with_multiple_archs)
834        << A->getAsString(Args);
835  }
836
837  ActionList SingleActions;
838  BuildActions(TC, Args, BAInputs, SingleActions);
839
840  // Add in arch bindings for every top level action, as well as lipo and
841  // dsymutil steps if needed.
842  for (unsigned i = 0, e = SingleActions.size(); i != e; ++i) {
843    Action *Act = SingleActions[i];
844
845    // Make sure we can lipo this kind of output. If not (and it is an actual
846    // output) then we disallow, since we can't create an output file with the
847    // right name without overwriting it. We could remove this oddity by just
848    // changing the output names to include the arch, which would also fix
849    // -save-temps. Compatibility wins for now.
850
851    if (Archs.size() > 1 && !types::canLipoType(Act->getType()))
852      Diag(clang::diag::err_drv_invalid_output_with_multiple_archs)
853        << types::getTypeName(Act->getType());
854
855    ActionList Inputs;
856    for (unsigned i = 0, e = Archs.size(); i != e; ++i) {
857      Inputs.push_back(new BindArchAction(Act, Archs[i]));
858      if (i != 0)
859        Inputs.back()->setOwnsInputs(false);
860    }
861
862    // Lipo if necessary, we do it this way because we need to set the arch flag
863    // so that -Xarch_ gets overwritten.
864    if (Inputs.size() == 1 || Act->getType() == types::TY_Nothing)
865      Actions.append(Inputs.begin(), Inputs.end());
866    else
867      Actions.push_back(new LipoJobAction(Inputs, Act->getType()));
868
869    // Handle debug info queries.
870    Arg *A = Args.getLastArg(options::OPT_g_Group);
871    if (A && !A->getOption().matches(options::OPT_g0) &&
872        !A->getOption().matches(options::OPT_gstabs) &&
873        ContainsCompileOrAssembleAction(Actions.back())) {
874
875      // Add a 'dsymutil' step if necessary, when debug info is enabled and we
876      // have a compile input. We need to run 'dsymutil' ourselves in such cases
877      // because the debug info will refer to a temporary object file which
878      // will be removed at the end of the compilation process.
879      if (Act->getType() == types::TY_Image) {
880        ActionList Inputs;
881        Inputs.push_back(Actions.back());
882        Actions.pop_back();
883        Actions.push_back(new DsymutilJobAction(Inputs, types::TY_dSYM));
884      }
885
886      // Verify the output (debug information only) if we passed '-verify'.
887      if (Args.hasArg(options::OPT_verify)) {
888        ActionList VerifyInputs;
889        VerifyInputs.push_back(Actions.back());
890        Actions.pop_back();
891        Actions.push_back(new VerifyJobAction(VerifyInputs,
892                                              types::TY_Nothing));
893      }
894    }
895  }
896}
897
898// Construct a the list of inputs and their types.
899void Driver::BuildInputs(const ToolChain &TC, const DerivedArgList &Args,
900                         InputList &Inputs) const {
901  // Track the current user specified (-x) input. We also explicitly track the
902  // argument used to set the type; we only want to claim the type when we
903  // actually use it, so we warn about unused -x arguments.
904  types::ID InputType = types::TY_Nothing;
905  Arg *InputTypeArg = 0;
906
907  for (ArgList::const_iterator it = Args.begin(), ie = Args.end();
908       it != ie; ++it) {
909    Arg *A = *it;
910
911    if (A->getOption().getKind() == Option::InputClass) {
912      const char *Value = A->getValue();
913      types::ID Ty = types::TY_INVALID;
914
915      // Infer the input type if necessary.
916      if (InputType == types::TY_Nothing) {
917        // If there was an explicit arg for this, claim it.
918        if (InputTypeArg)
919          InputTypeArg->claim();
920
921        // stdin must be handled specially.
922        if (memcmp(Value, "-", 2) == 0) {
923          // If running with -E, treat as a C input (this changes the builtin
924          // macros, for example). This may be overridden by -ObjC below.
925          //
926          // Otherwise emit an error but still use a valid type to avoid
927          // spurious errors (e.g., no inputs).
928          if (!Args.hasArgNoClaim(options::OPT_E) && !CCCIsCPP)
929            Diag(clang::diag::err_drv_unknown_stdin_type);
930          Ty = types::TY_C;
931        } else {
932          // Otherwise lookup by extension.
933          // Fallback is C if invoked as C preprocessor or Object otherwise.
934          // We use a host hook here because Darwin at least has its own
935          // idea of what .s is.
936          if (const char *Ext = strrchr(Value, '.'))
937            Ty = TC.LookupTypeForExtension(Ext + 1);
938
939          if (Ty == types::TY_INVALID) {
940            if (CCCIsCPP)
941              Ty = types::TY_C;
942            else
943              Ty = types::TY_Object;
944          }
945
946          // If the driver is invoked as C++ compiler (like clang++ or c++) it
947          // should autodetect some input files as C++ for g++ compatibility.
948          if (CCCIsCXX) {
949            types::ID OldTy = Ty;
950            Ty = types::lookupCXXTypeForCType(Ty);
951
952            if (Ty != OldTy)
953              Diag(clang::diag::warn_drv_treating_input_as_cxx)
954                << getTypeName(OldTy) << getTypeName(Ty);
955          }
956        }
957
958        // -ObjC and -ObjC++ override the default language, but only for "source
959        // files". We just treat everything that isn't a linker input as a
960        // source file.
961        //
962        // FIXME: Clean this up if we move the phase sequence into the type.
963        if (Ty != types::TY_Object) {
964          if (Args.hasArg(options::OPT_ObjC))
965            Ty = types::TY_ObjC;
966          else if (Args.hasArg(options::OPT_ObjCXX))
967            Ty = types::TY_ObjCXX;
968        }
969      } else {
970        assert(InputTypeArg && "InputType set w/o InputTypeArg");
971        InputTypeArg->claim();
972        Ty = InputType;
973      }
974
975      // Check that the file exists, if enabled.
976      if (CheckInputsExist && memcmp(Value, "-", 2) != 0) {
977        SmallString<64> Path(Value);
978        if (Arg *WorkDir = Args.getLastArg(options::OPT_working_directory)) {
979          if (!llvm::sys::path::is_absolute(Path.str())) {
980            SmallString<64> Directory(WorkDir->getValue());
981            llvm::sys::path::append(Directory, Value);
982            Path.assign(Directory);
983          }
984        }
985
986        bool exists = false;
987        if (llvm::sys::fs::exists(Path.c_str(), exists) || !exists)
988          Diag(clang::diag::err_drv_no_such_file) << Path.str();
989        else
990          Inputs.push_back(std::make_pair(Ty, A));
991      } else
992        Inputs.push_back(std::make_pair(Ty, A));
993
994    } else if (A->getOption().hasFlag(options::LinkerInput)) {
995      // Just treat as object type, we could make a special type for this if
996      // necessary.
997      Inputs.push_back(std::make_pair(types::TY_Object, A));
998
999    } else if (A->getOption().matches(options::OPT_x)) {
1000      InputTypeArg = A;
1001      InputType = types::lookupTypeForTypeSpecifier(A->getValue());
1002      A->claim();
1003
1004      // Follow gcc behavior and treat as linker input for invalid -x
1005      // options. Its not clear why we shouldn't just revert to unknown; but
1006      // this isn't very important, we might as well be bug compatible.
1007      if (!InputType) {
1008        Diag(clang::diag::err_drv_unknown_language) << A->getValue();
1009        InputType = types::TY_Object;
1010      }
1011    }
1012  }
1013  if (CCCIsCPP && Inputs.empty()) {
1014    // If called as standalone preprocessor, stdin is processed
1015    // if no other input is present.
1016    unsigned Index = Args.getBaseArgs().MakeIndex("-");
1017    Arg *A = Opts->ParseOneArg(Args, Index);
1018    A->claim();
1019    Inputs.push_back(std::make_pair(types::TY_C, A));
1020  }
1021}
1022
1023void Driver::BuildActions(const ToolChain &TC, const DerivedArgList &Args,
1024                          const InputList &Inputs, ActionList &Actions) const {
1025  llvm::PrettyStackTraceString CrashInfo("Building compilation actions");
1026
1027  if (!SuppressMissingInputWarning && Inputs.empty()) {
1028    Diag(clang::diag::err_drv_no_input_files);
1029    return;
1030  }
1031
1032  Arg *FinalPhaseArg;
1033  phases::ID FinalPhase = getFinalPhase(Args, &FinalPhaseArg);
1034
1035  // Reject -Z* at the top level, these options should never have been exposed
1036  // by gcc.
1037  if (Arg *A = Args.getLastArg(options::OPT_Z_Joined))
1038    Diag(clang::diag::err_drv_use_of_Z_option) << A->getAsString(Args);
1039
1040  // Construct the actions to perform.
1041  ActionList LinkerInputs;
1042  ActionList SplitInputs;
1043  llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases> PL;
1044  for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1045    types::ID InputType = Inputs[i].first;
1046    const Arg *InputArg = Inputs[i].second;
1047
1048    PL.clear();
1049    types::getCompilationPhases(InputType, PL);
1050
1051    // If the first step comes after the final phase we are doing as part of
1052    // this compilation, warn the user about it.
1053    phases::ID InitialPhase = PL[0];
1054    if (InitialPhase > FinalPhase) {
1055      // Claim here to avoid the more general unused warning.
1056      InputArg->claim();
1057
1058      // Suppress all unused style warnings with -Qunused-arguments
1059      if (Args.hasArg(options::OPT_Qunused_arguments))
1060        continue;
1061
1062      // Special case when final phase determined by binary name, rather than
1063      // by a command-line argument with a corresponding Arg.
1064      if (CCCIsCPP)
1065        Diag(clang::diag::warn_drv_input_file_unused_by_cpp)
1066          << InputArg->getAsString(Args)
1067          << getPhaseName(InitialPhase);
1068      // Special case '-E' warning on a previously preprocessed file to make
1069      // more sense.
1070      else if (InitialPhase == phases::Compile &&
1071               FinalPhase == phases::Preprocess &&
1072               getPreprocessedType(InputType) == types::TY_INVALID)
1073        Diag(clang::diag::warn_drv_preprocessed_input_file_unused)
1074          << InputArg->getAsString(Args)
1075          << !!FinalPhaseArg
1076          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1077      else
1078        Diag(clang::diag::warn_drv_input_file_unused)
1079          << InputArg->getAsString(Args)
1080          << getPhaseName(InitialPhase)
1081          << !!FinalPhaseArg
1082          << FinalPhaseArg ? FinalPhaseArg->getOption().getName() : "";
1083      continue;
1084    }
1085
1086    // Build the pipeline for this file.
1087    OwningPtr<Action> Current(new InputAction(*InputArg, InputType));
1088    for (llvm::SmallVector<phases::ID, phases::MaxNumberOfPhases>::iterator
1089           i = PL.begin(), e = PL.end(); i != e; ++i) {
1090      phases::ID Phase = *i;
1091
1092      // We are done if this step is past what the user requested.
1093      if (Phase > FinalPhase)
1094        break;
1095
1096      // Queue linker inputs.
1097      if (Phase == phases::Link) {
1098        assert((i + 1) == e && "linking must be final compilation step.");
1099        LinkerInputs.push_back(Current.take());
1100        break;
1101      }
1102
1103      // Some types skip the assembler phase (e.g., llvm-bc), but we can't
1104      // encode this in the steps because the intermediate type depends on
1105      // arguments. Just special case here.
1106      if (Phase == phases::Assemble && Current->getType() != types::TY_PP_Asm)
1107        continue;
1108
1109      // Otherwise construct the appropriate action.
1110      Current.reset(ConstructPhaseAction(Args, Phase, Current.take()));
1111      if (Current->getType() == types::TY_Nothing)
1112        break;
1113    }
1114
1115    // If we ended with something, add to the output list.
1116    if (Current)
1117      Actions.push_back(Current.take());
1118  }
1119
1120  // Add a link action if necessary.
1121  if (!LinkerInputs.empty())
1122    Actions.push_back(new LinkJobAction(LinkerInputs, types::TY_Image));
1123
1124  // If we are linking, claim any options which are obviously only used for
1125  // compilation.
1126  if (FinalPhase == phases::Link && PL.size() == 1)
1127    Args.ClaimAllArgs(options::OPT_CompileOnly_Group);
1128}
1129
1130Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
1131                                     Action *Input) const {
1132  llvm::PrettyStackTraceString CrashInfo("Constructing phase actions");
1133  // Build the appropriate action.
1134  switch (Phase) {
1135  case phases::Link: llvm_unreachable("link action invalid here.");
1136  case phases::Preprocess: {
1137    types::ID OutputTy;
1138    // -{M, MM} alter the output type.
1139    if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
1140      OutputTy = types::TY_Dependencies;
1141    } else {
1142      OutputTy = Input->getType();
1143      if (!Args.hasFlag(options::OPT_frewrite_includes,
1144                        options::OPT_fno_rewrite_includes, false))
1145        OutputTy = types::getPreprocessedType(OutputTy);
1146      assert(OutputTy != types::TY_INVALID &&
1147             "Cannot preprocess this input type!");
1148    }
1149    return new PreprocessJobAction(Input, OutputTy);
1150  }
1151  case phases::Precompile: {
1152    types::ID OutputTy = types::TY_PCH;
1153    if (Args.hasArg(options::OPT_fsyntax_only)) {
1154      // Syntax checks should not emit a PCH file
1155      OutputTy = types::TY_Nothing;
1156    }
1157    return new PrecompileJobAction(Input, OutputTy);
1158  }
1159  case phases::Compile: {
1160    if (Args.hasArg(options::OPT_fsyntax_only)) {
1161      return new CompileJobAction(Input, types::TY_Nothing);
1162    } else if (Args.hasArg(options::OPT_rewrite_objc)) {
1163      return new CompileJobAction(Input, types::TY_RewrittenObjC);
1164    } else if (Args.hasArg(options::OPT_rewrite_legacy_objc)) {
1165      return new CompileJobAction(Input, types::TY_RewrittenLegacyObjC);
1166    } else if (Args.hasArg(options::OPT__analyze, options::OPT__analyze_auto)) {
1167      return new AnalyzeJobAction(Input, types::TY_Plist);
1168    } else if (Args.hasArg(options::OPT__migrate)) {
1169      return new MigrateJobAction(Input, types::TY_Remap);
1170    } else if (Args.hasArg(options::OPT_emit_ast)) {
1171      return new CompileJobAction(Input, types::TY_AST);
1172    } else if (IsUsingLTO(Args)) {
1173      types::ID Output =
1174        Args.hasArg(options::OPT_S) ? types::TY_LTO_IR : types::TY_LTO_BC;
1175      return new CompileJobAction(Input, Output);
1176    } else {
1177      return new CompileJobAction(Input, types::TY_PP_Asm);
1178    }
1179  }
1180  case phases::Assemble:
1181    return new AssembleJobAction(Input, types::TY_Object);
1182  }
1183
1184  llvm_unreachable("invalid phase in ConstructPhaseAction");
1185}
1186
1187bool Driver::IsUsingLTO(const ArgList &Args) const {
1188  // Check for -emit-llvm or -flto.
1189  if (Args.hasArg(options::OPT_emit_llvm) ||
1190      Args.hasFlag(options::OPT_flto, options::OPT_fno_lto, false))
1191    return true;
1192
1193  // Check for -O4.
1194  if (const Arg *A = Args.getLastArg(options::OPT_O_Group))
1195      return A->getOption().matches(options::OPT_O4);
1196
1197  return false;
1198}
1199
1200void Driver::BuildJobs(Compilation &C) const {
1201  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1202
1203  Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o);
1204
1205  // It is an error to provide a -o option if we are making multiple output
1206  // files.
1207  if (FinalOutput) {
1208    unsigned NumOutputs = 0;
1209    for (ActionList::const_iterator it = C.getActions().begin(),
1210           ie = C.getActions().end(); it != ie; ++it)
1211      if ((*it)->getType() != types::TY_Nothing)
1212        ++NumOutputs;
1213
1214    if (NumOutputs > 1) {
1215      Diag(clang::diag::err_drv_output_argument_with_multiple_files);
1216      FinalOutput = 0;
1217    }
1218  }
1219
1220  for (ActionList::const_iterator it = C.getActions().begin(),
1221         ie = C.getActions().end(); it != ie; ++it) {
1222    Action *A = *it;
1223
1224    // If we are linking an image for multiple archs then the linker wants
1225    // -arch_multiple and -final_output <final image name>. Unfortunately, this
1226    // doesn't fit in cleanly because we have to pass this information down.
1227    //
1228    // FIXME: This is a hack; find a cleaner way to integrate this into the
1229    // process.
1230    const char *LinkingOutput = 0;
1231    if (isa<LipoJobAction>(A)) {
1232      if (FinalOutput)
1233        LinkingOutput = FinalOutput->getValue();
1234      else
1235        LinkingOutput = DefaultImageName.c_str();
1236    }
1237
1238    InputInfo II;
1239    BuildJobsForAction(C, A, &C.getDefaultToolChain(),
1240                       /*BoundArch*/0,
1241                       /*AtTopLevel*/ true,
1242                       /*LinkingOutput*/ LinkingOutput,
1243                       II);
1244  }
1245
1246  // If the user passed -Qunused-arguments or there were errors, don't warn
1247  // about any unused arguments.
1248  if (Diags.hasErrorOccurred() ||
1249      C.getArgs().hasArg(options::OPT_Qunused_arguments))
1250    return;
1251
1252  // Claim -### here.
1253  (void) C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
1254
1255  for (ArgList::const_iterator it = C.getArgs().begin(), ie = C.getArgs().end();
1256       it != ie; ++it) {
1257    Arg *A = *it;
1258
1259    // FIXME: It would be nice to be able to send the argument to the
1260    // DiagnosticsEngine, so that extra values, position, and so on could be
1261    // printed.
1262    if (!A->isClaimed()) {
1263      if (A->getOption().hasFlag(options::NoArgumentUnused))
1264        continue;
1265
1266      // Suppress the warning automatically if this is just a flag, and it is an
1267      // instance of an argument we already claimed.
1268      const Option &Opt = A->getOption();
1269      if (Opt.getKind() == Option::FlagClass) {
1270        bool DuplicateClaimed = false;
1271
1272        for (arg_iterator it = C.getArgs().filtered_begin(&Opt),
1273               ie = C.getArgs().filtered_end(); it != ie; ++it) {
1274          if ((*it)->isClaimed()) {
1275            DuplicateClaimed = true;
1276            break;
1277          }
1278        }
1279
1280        if (DuplicateClaimed)
1281          continue;
1282      }
1283
1284      Diag(clang::diag::warn_drv_unused_argument)
1285        << A->getAsString(C.getArgs());
1286    }
1287  }
1288}
1289
1290static const Tool &SelectToolForJob(Compilation &C, const ToolChain *TC,
1291                                    const JobAction *JA,
1292                                    const ActionList *&Inputs) {
1293  const Tool *ToolForJob = 0;
1294
1295  // See if we should look for a compiler with an integrated assembler. We match
1296  // bottom up, so what we are actually looking for is an assembler job with a
1297  // compiler input.
1298
1299  if (TC->useIntegratedAs() &&
1300      !C.getArgs().hasArg(options::OPT_save_temps) &&
1301      isa<AssembleJobAction>(JA) &&
1302      Inputs->size() == 1 && isa<CompileJobAction>(*Inputs->begin())) {
1303    const Tool &Compiler =
1304      TC->SelectTool(cast<JobAction>(**Inputs->begin()));
1305    if (Compiler.hasIntegratedAssembler()) {
1306      Inputs = &(*Inputs)[0]->getInputs();
1307      ToolForJob = &Compiler;
1308    }
1309  }
1310
1311  // Otherwise use the tool for the current job.
1312  if (!ToolForJob)
1313    ToolForJob = &TC->SelectTool(*JA);
1314
1315  // See if we should use an integrated preprocessor. We do so when we have
1316  // exactly one input, since this is the only use case we care about
1317  // (irrelevant since we don't support combine yet).
1318  if (Inputs->size() == 1 && isa<PreprocessJobAction>(*Inputs->begin()) &&
1319      !C.getArgs().hasArg(options::OPT_no_integrated_cpp) &&
1320      !C.getArgs().hasArg(options::OPT_traditional_cpp) &&
1321      !C.getArgs().hasArg(options::OPT_save_temps) &&
1322      !C.getArgs().hasArg(options::OPT_rewrite_objc) &&
1323      ToolForJob->hasIntegratedCPP())
1324    Inputs = &(*Inputs)[0]->getInputs();
1325
1326  return *ToolForJob;
1327}
1328
1329void Driver::BuildJobsForAction(Compilation &C,
1330                                const Action *A,
1331                                const ToolChain *TC,
1332                                const char *BoundArch,
1333                                bool AtTopLevel,
1334                                const char *LinkingOutput,
1335                                InputInfo &Result) const {
1336  llvm::PrettyStackTraceString CrashInfo("Building compilation jobs");
1337
1338  if (const InputAction *IA = dyn_cast<InputAction>(A)) {
1339    // FIXME: It would be nice to not claim this here; maybe the old scheme of
1340    // just using Args was better?
1341    const Arg &Input = IA->getInputArg();
1342    Input.claim();
1343    if (Input.getOption().matches(options::OPT_INPUT)) {
1344      const char *Name = Input.getValue();
1345      Result = InputInfo(Name, A->getType(), Name);
1346    } else
1347      Result = InputInfo(&Input, A->getType(), "");
1348    return;
1349  }
1350
1351  if (const BindArchAction *BAA = dyn_cast<BindArchAction>(A)) {
1352    const ToolChain *TC;
1353    const char *ArchName = BAA->getArchName();
1354
1355    if (ArchName)
1356      TC = &getToolChain(C.getArgs(), ArchName);
1357    else
1358      TC = &C.getDefaultToolChain();
1359
1360    BuildJobsForAction(C, *BAA->begin(), TC, BAA->getArchName(),
1361                       AtTopLevel, LinkingOutput, Result);
1362    return;
1363  }
1364
1365  const ActionList *Inputs = &A->getInputs();
1366
1367  const JobAction *JA = cast<JobAction>(A);
1368  const Tool &T = SelectToolForJob(C, TC, JA, Inputs);
1369
1370  // Only use pipes when there is exactly one input.
1371  InputInfoList InputInfos;
1372  for (ActionList::const_iterator it = Inputs->begin(), ie = Inputs->end();
1373       it != ie; ++it) {
1374    // Treat dsymutil and verify sub-jobs as being at the top-level too, they
1375    // shouldn't get temporary output names.
1376    // FIXME: Clean this up.
1377    bool SubJobAtTopLevel = false;
1378    if (AtTopLevel && (isa<DsymutilJobAction>(A) || isa<VerifyJobAction>(A)))
1379      SubJobAtTopLevel = true;
1380
1381    InputInfo II;
1382    BuildJobsForAction(C, *it, TC, BoundArch,
1383                       SubJobAtTopLevel, LinkingOutput, II);
1384    InputInfos.push_back(II);
1385  }
1386
1387  // Always use the first input as the base input.
1388  const char *BaseInput = InputInfos[0].getBaseInput();
1389
1390  // ... except dsymutil actions, which use their actual input as the base
1391  // input.
1392  if (JA->getType() == types::TY_dSYM)
1393    BaseInput = InputInfos[0].getFilename();
1394
1395  // Determine the place to write output to, if any.
1396  if (JA->getType() == types::TY_Nothing)
1397    Result = InputInfo(A->getType(), BaseInput);
1398  else
1399    Result = InputInfo(GetNamedOutputPath(C, *JA, BaseInput, AtTopLevel),
1400                       A->getType(), BaseInput);
1401
1402  if (CCCPrintBindings && !CCGenDiagnostics) {
1403    llvm::errs() << "# \"" << T.getToolChain().getTripleString() << '"'
1404                 << " - \"" << T.getName() << "\", inputs: [";
1405    for (unsigned i = 0, e = InputInfos.size(); i != e; ++i) {
1406      llvm::errs() << InputInfos[i].getAsString();
1407      if (i + 1 != e)
1408        llvm::errs() << ", ";
1409    }
1410    llvm::errs() << "], output: " << Result.getAsString() << "\n";
1411  } else {
1412    T.ConstructJob(C, *JA, Result, InputInfos,
1413                   C.getArgsForToolChain(TC, BoundArch), LinkingOutput);
1414  }
1415}
1416
1417const char *Driver::GetNamedOutputPath(Compilation &C,
1418                                       const JobAction &JA,
1419                                       const char *BaseInput,
1420                                       bool AtTopLevel) const {
1421  llvm::PrettyStackTraceString CrashInfo("Computing output path");
1422  // Output to a user requested destination?
1423  if (AtTopLevel && !isa<DsymutilJobAction>(JA) &&
1424      !isa<VerifyJobAction>(JA)) {
1425    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
1426      return C.addResultFile(FinalOutput->getValue(), &JA);
1427  }
1428
1429  // Default to writing to stdout?
1430  if (AtTopLevel && isa<PreprocessJobAction>(JA) && !CCGenDiagnostics)
1431    return "-";
1432
1433  // Output to a temporary file?
1434  if ((!AtTopLevel && !C.getArgs().hasArg(options::OPT_save_temps)) ||
1435      CCGenDiagnostics) {
1436    StringRef Name = llvm::sys::path::filename(BaseInput);
1437    std::pair<StringRef, StringRef> Split = Name.split('.');
1438    std::string TmpName =
1439      GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1440    return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1441  }
1442
1443  SmallString<128> BasePath(BaseInput);
1444  StringRef BaseName;
1445
1446  // Dsymutil actions should use the full path.
1447  if (isa<DsymutilJobAction>(JA) || isa<VerifyJobAction>(JA))
1448    BaseName = BasePath;
1449  else
1450    BaseName = llvm::sys::path::filename(BasePath);
1451
1452  // Determine what the derived output name should be.
1453  const char *NamedOutput;
1454  if (JA.getType() == types::TY_Image) {
1455    NamedOutput = DefaultImageName.c_str();
1456  } else {
1457    const char *Suffix = types::getTypeTempSuffix(JA.getType());
1458    assert(Suffix && "All types used for output should have a suffix.");
1459
1460    std::string::size_type End = std::string::npos;
1461    if (!types::appendSuffixForType(JA.getType()))
1462      End = BaseName.rfind('.');
1463    std::string Suffixed(BaseName.substr(0, End));
1464    Suffixed += '.';
1465    Suffixed += Suffix;
1466    NamedOutput = C.getArgs().MakeArgString(Suffixed.c_str());
1467  }
1468
1469  // If we're saving temps and the temp file conflicts with the input file,
1470  // then avoid overwriting input file.
1471  if (!AtTopLevel && C.getArgs().hasArg(options::OPT_save_temps) &&
1472      NamedOutput == BaseName) {
1473
1474    bool SameFile = false;
1475    SmallString<256> Result;
1476    llvm::sys::fs::current_path(Result);
1477    llvm::sys::path::append(Result, BaseName);
1478    llvm::sys::fs::equivalent(BaseInput, Result.c_str(), SameFile);
1479    // Must share the same path to conflict.
1480    if (SameFile) {
1481      StringRef Name = llvm::sys::path::filename(BaseInput);
1482      std::pair<StringRef, StringRef> Split = Name.split('.');
1483      std::string TmpName =
1484        GetTemporaryPath(Split.first, types::getTypeTempSuffix(JA.getType()));
1485      return C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
1486    }
1487  }
1488
1489  // As an annoying special case, PCH generation doesn't strip the pathname.
1490  if (JA.getType() == types::TY_PCH) {
1491    llvm::sys::path::remove_filename(BasePath);
1492    if (BasePath.empty())
1493      BasePath = NamedOutput;
1494    else
1495      llvm::sys::path::append(BasePath, NamedOutput);
1496    return C.addResultFile(C.getArgs().MakeArgString(BasePath.c_str()), &JA);
1497  } else {
1498    return C.addResultFile(NamedOutput, &JA);
1499  }
1500}
1501
1502std::string Driver::GetFilePath(const char *Name, const ToolChain &TC) const {
1503  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1504  // attempting to use this prefix when looking for file paths.
1505  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1506       ie = PrefixDirs.end(); it != ie; ++it) {
1507    std::string Dir(*it);
1508    if (Dir.empty())
1509      continue;
1510    if (Dir[0] == '=')
1511      Dir = SysRoot + Dir.substr(1);
1512    llvm::sys::Path P(Dir);
1513    P.appendComponent(Name);
1514    bool Exists;
1515    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1516      return P.str();
1517  }
1518
1519  llvm::sys::Path P(ResourceDir);
1520  P.appendComponent(Name);
1521  bool Exists;
1522  if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1523    return P.str();
1524
1525  const ToolChain::path_list &List = TC.getFilePaths();
1526  for (ToolChain::path_list::const_iterator
1527         it = List.begin(), ie = List.end(); it != ie; ++it) {
1528    std::string Dir(*it);
1529    if (Dir.empty())
1530      continue;
1531    if (Dir[0] == '=')
1532      Dir = SysRoot + Dir.substr(1);
1533    llvm::sys::Path P(Dir);
1534    P.appendComponent(Name);
1535    bool Exists;
1536    if (!llvm::sys::fs::exists(P.str(), Exists) && Exists)
1537      return P.str();
1538  }
1539
1540  return Name;
1541}
1542
1543std::string Driver::GetProgramPath(const char *Name,
1544                                   const ToolChain &TC) const {
1545  // FIXME: Needs a better variable than DefaultTargetTriple
1546  std::string TargetSpecificExecutable(DefaultTargetTriple + "-" + Name);
1547  // Respect a limited subset of the '-Bprefix' functionality in GCC by
1548  // attempting to use this prefix when looking for program paths.
1549  for (Driver::prefix_list::const_iterator it = PrefixDirs.begin(),
1550       ie = PrefixDirs.end(); it != ie; ++it) {
1551    bool IsDirectory;
1552    if (!llvm::sys::fs::is_directory(*it, IsDirectory) && IsDirectory) {
1553      llvm::sys::Path P(*it);
1554      P.appendComponent(TargetSpecificExecutable);
1555      if (P.canExecute()) return P.str();
1556      P.eraseComponent();
1557      P.appendComponent(Name);
1558      if (P.canExecute()) return P.str();
1559    } else {
1560      llvm::sys::Path P(*it + Name);
1561      if (P.canExecute()) return P.str();
1562    }
1563  }
1564
1565  const ToolChain::path_list &List = TC.getProgramPaths();
1566  for (ToolChain::path_list::const_iterator
1567         it = List.begin(), ie = List.end(); it != ie; ++it) {
1568    llvm::sys::Path P(*it);
1569    P.appendComponent(TargetSpecificExecutable);
1570    if (P.canExecute()) return P.str();
1571    P.eraseComponent();
1572    P.appendComponent(Name);
1573    if (P.canExecute()) return P.str();
1574  }
1575
1576  // If all else failed, search the path.
1577  llvm::sys::Path
1578      P(llvm::sys::Program::FindProgramByName(TargetSpecificExecutable));
1579  if (!P.empty())
1580    return P.str();
1581
1582  P = llvm::sys::Path(llvm::sys::Program::FindProgramByName(Name));
1583  if (!P.empty())
1584    return P.str();
1585
1586  return Name;
1587}
1588
1589std::string Driver::GetTemporaryPath(StringRef Prefix, const char *Suffix)
1590  const {
1591  // FIXME: This is lame; sys::Path should provide this function (in particular,
1592  // it should know how to find the temporary files dir).
1593  std::string Error;
1594  const char *TmpDir = ::getenv("TMPDIR");
1595  if (!TmpDir)
1596    TmpDir = ::getenv("TEMP");
1597  if (!TmpDir)
1598    TmpDir = ::getenv("TMP");
1599  if (!TmpDir)
1600    TmpDir = "/tmp";
1601  llvm::sys::Path P(TmpDir);
1602  P.appendComponent(Prefix);
1603  if (P.makeUnique(false, &Error)) {
1604    Diag(clang::diag::err_unable_to_make_temp) << Error;
1605    return "";
1606  }
1607
1608  // FIXME: Grumble, makeUnique sometimes leaves the file around!?  PR3837.
1609  P.eraseFromDisk(false, 0);
1610
1611  if (Suffix)
1612    P.appendSuffix(Suffix);
1613  return P.str();
1614}
1615
1616/// \brief Compute target triple from args.
1617///
1618/// This routine provides the logic to compute a target triple from various
1619/// args passed to the driver and the default triple string.
1620static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
1621                                        const ArgList &Args,
1622                                        StringRef DarwinArchName) {
1623  // FIXME: Already done in Compilation *Driver::BuildCompilation
1624  if (const Arg *A = Args.getLastArg(options::OPT_target))
1625    DefaultTargetTriple = A->getValue();
1626
1627  llvm::Triple Target(llvm::Triple::normalize(DefaultTargetTriple));
1628
1629  // Handle Darwin-specific options available here.
1630  if (Target.isOSDarwin()) {
1631    // If an explict Darwin arch name is given, that trumps all.
1632    if (!DarwinArchName.empty()) {
1633      Target.setArch(
1634        tools::darwin::getArchTypeForDarwinArchName(DarwinArchName));
1635      return Target;
1636    }
1637
1638    // Handle the Darwin '-arch' flag.
1639    if (Arg *A = Args.getLastArg(options::OPT_arch)) {
1640      llvm::Triple::ArchType DarwinArch
1641        = tools::darwin::getArchTypeForDarwinArchName(A->getValue());
1642      if (DarwinArch != llvm::Triple::UnknownArch)
1643        Target.setArch(DarwinArch);
1644    }
1645  }
1646
1647  // Skip further flag support on OSes which don't support '-m32' or '-m64'.
1648  if (Target.getArchName() == "tce" ||
1649      Target.getOS() == llvm::Triple::AuroraUX ||
1650      Target.getOS() == llvm::Triple::Minix)
1651    return Target;
1652
1653  // Handle pseudo-target flags '-m32' and '-m64'.
1654  // FIXME: Should this information be in llvm::Triple?
1655  if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
1656    if (A->getOption().matches(options::OPT_m32)) {
1657      if (Target.getArch() == llvm::Triple::x86_64)
1658        Target.setArch(llvm::Triple::x86);
1659      if (Target.getArch() == llvm::Triple::ppc64)
1660        Target.setArch(llvm::Triple::ppc);
1661    } else {
1662      if (Target.getArch() == llvm::Triple::x86)
1663        Target.setArch(llvm::Triple::x86_64);
1664      if (Target.getArch() == llvm::Triple::ppc)
1665        Target.setArch(llvm::Triple::ppc64);
1666    }
1667  }
1668
1669  return Target;
1670}
1671
1672const ToolChain &Driver::getToolChain(const ArgList &Args,
1673                                      StringRef DarwinArchName) const {
1674  llvm::Triple Target = computeTargetTriple(DefaultTargetTriple, Args,
1675                                            DarwinArchName);
1676
1677  ToolChain *&TC = ToolChains[Target.str()];
1678  if (!TC) {
1679    switch (Target.getOS()) {
1680    case llvm::Triple::AuroraUX:
1681      TC = new toolchains::AuroraUX(*this, Target, Args);
1682      break;
1683    case llvm::Triple::Darwin:
1684    case llvm::Triple::MacOSX:
1685    case llvm::Triple::IOS:
1686      if (Target.getArch() == llvm::Triple::x86 ||
1687          Target.getArch() == llvm::Triple::x86_64 ||
1688          Target.getArch() == llvm::Triple::arm ||
1689          Target.getArch() == llvm::Triple::thumb)
1690        TC = new toolchains::DarwinClang(*this, Target, Args);
1691      else
1692        TC = new toolchains::Darwin_Generic_GCC(*this, Target, Args);
1693      break;
1694    case llvm::Triple::DragonFly:
1695      TC = new toolchains::DragonFly(*this, Target, Args);
1696      break;
1697    case llvm::Triple::OpenBSD:
1698      TC = new toolchains::OpenBSD(*this, Target, Args);
1699      break;
1700    case llvm::Triple::Bitrig:
1701      TC = new toolchains::Bitrig(*this, Target, Args);
1702      break;
1703    case llvm::Triple::NetBSD:
1704      TC = new toolchains::NetBSD(*this, Target, Args);
1705      break;
1706    case llvm::Triple::FreeBSD:
1707      TC = new toolchains::FreeBSD(*this, Target, Args);
1708      break;
1709    case llvm::Triple::Minix:
1710      TC = new toolchains::Minix(*this, Target, Args);
1711      break;
1712    case llvm::Triple::Linux:
1713      if (Target.getArch() == llvm::Triple::hexagon)
1714        TC = new toolchains::Hexagon_TC(*this, Target, Args);
1715      else
1716        TC = new toolchains::Linux(*this, Target, Args);
1717      break;
1718    case llvm::Triple::Solaris:
1719      TC = new toolchains::Solaris(*this, Target, Args);
1720      break;
1721    case llvm::Triple::Win32:
1722      TC = new toolchains::Windows(*this, Target, Args);
1723      break;
1724    case llvm::Triple::MinGW32:
1725      // FIXME: We need a MinGW toolchain. Fallthrough for now.
1726    default:
1727      // TCE is an OSless target
1728      if (Target.getArchName() == "tce") {
1729        TC = new toolchains::TCEToolChain(*this, Target, Args);
1730        break;
1731      }
1732
1733      TC = new toolchains::Generic_GCC(*this, Target, Args);
1734      break;
1735    }
1736  }
1737  return *TC;
1738}
1739
1740bool Driver::ShouldUseClangCompiler(const JobAction &JA) const {
1741  // Check if user requested no clang, or clang doesn't understand this type (we
1742  // only handle single inputs for now).
1743  if (JA.size() != 1 ||
1744      !types::isAcceptedByClang((*JA.begin())->getType()))
1745    return false;
1746
1747  // Otherwise make sure this is an action clang understands.
1748  if (!isa<PreprocessJobAction>(JA) && !isa<PrecompileJobAction>(JA) &&
1749      !isa<CompileJobAction>(JA))
1750    return false;
1751
1752  return true;
1753}
1754
1755/// GetReleaseVersion - Parse (([0-9]+)(.([0-9]+)(.([0-9]+)?))?)? and return the
1756/// grouped values as integers. Numbers which are not provided are set to 0.
1757///
1758/// \return True if the entire string was parsed (9.2), or all groups were
1759/// parsed (10.3.5extrastuff).
1760bool Driver::GetReleaseVersion(const char *Str, unsigned &Major,
1761                               unsigned &Minor, unsigned &Micro,
1762                               bool &HadExtra) {
1763  HadExtra = false;
1764
1765  Major = Minor = Micro = 0;
1766  if (*Str == '\0')
1767    return true;
1768
1769  char *End;
1770  Major = (unsigned) strtol(Str, &End, 10);
1771  if (*Str != '\0' && *End == '\0')
1772    return true;
1773  if (*End != '.')
1774    return false;
1775
1776  Str = End+1;
1777  Minor = (unsigned) strtol(Str, &End, 10);
1778  if (*Str != '\0' && *End == '\0')
1779    return true;
1780  if (*End != '.')
1781    return false;
1782
1783  Str = End+1;
1784  Micro = (unsigned) strtol(Str, &End, 10);
1785  if (*Str != '\0' && *End == '\0')
1786    return true;
1787  if (Str == End)
1788    return false;
1789  HadExtra = true;
1790  return true;
1791}
1792