gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #include <cstdlib>
  26 #include <vector>
  27 #include <iostream>
  28 #include <sys/stat.h>
  29 #include "filenames.h"
  30 #include "libiberty.h"
  31 #include "demangle.h"
  32
  33 #include "debug.h"
  34 #include "script.h"
  35 #include "target-select.h"
  36 #include "options.h"
  37
  38 namespace gold
  39 {
  40
  41 General_options
  42 Position_dependent_options::default_options_;
  43
  44 namespace options
  45 {
  46
  47 // This global variable is set up as General_options is constructed.
  48 static std::vector<const One_option*> registered_options;
  49
  50 // These are set up at the same time -- the variables that accept one
  51 // dash, two, or require -z.  A single variable may be in more than
  52 // one of thes data structures.
  53 typedef Unordered_map<std::string, One_option*> Option_map;
  54 static Option_map* long_options = NULL;
  55 static One_option* short_options[128];
  56
  57 void
  58 One_option::register_option()
  59 {
  60   registered_options.push_back(this);
  61
  62   // We can't make long_options a static Option_map because we can't
  63   // guarantee that will be initialized before register_option() is
  64   // first called.
  65   if (long_options == NULL)
  66     long_options = new Option_map;
  67
  68   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  69   if (!this->longname.empty())
  70     (*long_options)[this->longname] = this;
  71
  72   const int shortname_as_int = static_cast<int>(this->shortname);
  73   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  74   if (this->shortname != '\0')
  75     short_options[shortname_as_int] = this;
  76 }
  77
  78 void
  79 One_option::print() const
  80 {
  81   bool comma = false;
  82   printf("  ");
  83   int len = 2;
  84   if (this->shortname != '\0')
  85     {
  86       len += printf("-%c", this->shortname);
  87       if (this->helparg)
  88         {
  89           // -z takes long-names only.
  90           gold_assert(this->dashes != DASH_Z);
  91           len += printf(" %s", gettext(this->helparg));
  92         }
  93       comma = true;
  94     }
  95   if (!this->longname.empty()
  96       && !(this->longname[0] == this->shortname
  97            && this->longname[1] == '\0'))
  98     {
  99       if (comma)
 100         len += printf(", ");
 101       switch (this->dashes)
 102         {
 103         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 104           len += printf("-");
 105           break;
 106         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 107           len += printf("--");
 108           break;
 109         case options::DASH_Z:
 110           len += printf("-z ");
 111           break;
 112         default:
 113           gold_unreachable();
 114         }
 115       len += printf("%s", this->longname.c_str());
 116       if (this->helparg)
 117         {
 118           // For most options, we print "--frob FOO".  But for -z
 119           // we print "-z frob=FOO".
 120           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 121                         gettext(this->helparg));
 122         }
 123     }
 124
 125   if (len >= 30)
 126     {
 127       printf("\n");
 128       len = 0;
 129     }
 130   for (; len < 30; ++len)
 131     std::putchar(' ');
 132
 133   // TODO: if we're boolean, add " (default)" when appropriate.
 134   printf("%s\n", gettext(this->helpstring));
 135 }
 136
 137 void
 138 help()
 139 {
 140   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 141
 142   std::vector<const One_option*>::const_iterator it;
 143   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 144     (*it)->print();
 145 }
 146
 147 // For bool, arg will be NULL (boolean options take no argument);
 148 // we always just set to true.
 149 void
 150 parse_bool(const char*, const char*, bool* retval)
 151 {
 152   *retval = true;
 153 }
 154
 155 void
 156 parse_uint(const char* option_name, const char* arg, int* retval)
 157 {
 158   char* endptr;
 159   *retval = strtol(arg, &endptr, 0);
 160   if (*endptr != '\0' || retval < 0)
 161     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 162                option_name, arg);
 163 }
 164
 165 void
 166 parse_uint64(const char* option_name, const char* arg, uint64_t *retval)
 167 {
 168   char* endptr;
 169   *retval = strtoull(arg, &endptr, 0);
 170   if (*endptr != '\0')
 171     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 172                option_name, arg);
 173 }
 174
 175 void
 176 parse_double(const char* option_name, const char* arg, double* retval)
 177 {
 178   char* endptr;
 179   *retval = strtod(arg, &endptr);
 180   if (*endptr != '\0')
 181     gold_fatal(_("%s: invalid option value "
 182                  "(expected a floating point number): %s"),
 183                option_name, arg);
 184 }
 185
 186 void
 187 parse_string(const char* option_name, const char* arg, const char** retval)
 188 {
 189   if (*arg == '\0')
 190     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 191   *retval = arg;
 192 }
 193
 194 void
 195 parse_optional_string(const char*, const char* arg, const char** retval)
 196 {
 197   *retval = arg;
 198 }
 199
 200 void
 201 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 202 {
 203   retval->push_back(Search_directory(arg, false));
 204 }
 205
 206 void
 207 parse_choices(const char* option_name, const char* arg, const char** retval,
 208               const char* choices[], int num_choices)
 209 {
 210   for (int i = 0; i < num_choices; i++)
 211     if (strcmp(choices[i], arg) == 0)
 212       {
 213         *retval = arg;
 214         return;
 215       }
 216
 217   // If we get here, the user did not enter a valid choice, so we die.
 218   std::string choices_list;
 219   for (int i = 0; i < num_choices; i++)
 220     {
 221       choices_list += choices[i];
 222       if (i != num_choices - 1)
 223         choices_list += ", ";
 224     }
 225   gold_fatal(_("%s: must take one of the following arguments: %s"),
 226              option_name, choices_list.c_str());
 227 }
 228
 229 } // End namespace options.
 230
 231 // Define the handler for "special" options (set via DEFINE_special).
 232
 233 void
 234 General_options::parse_help(const char*, const char*, Command_line*)
 235 {
 236   options::help();
 237   ::exit(EXIT_SUCCESS);
 238 }
 239
 240 void
 241 General_options::parse_version(const char* opt, const char*, Command_line*)
 242 {
 243   gold::print_version(opt[0] == '-' && opt[1] == 'v');
 244   ::exit(EXIT_SUCCESS);
 245 }
 246
 247 void
 248 General_options::parse_Bstatic(const char*, const char*, Command_line*)
 249 {
 250   this->set_Bdynamic(false);
 251 }
 252
 253 void
 254 General_options::parse_defsym(const char*, const char* arg,
 255                               Command_line* cmdline)
 256 {
 257   cmdline->script_options().define_symbol(arg);
 258 }
 259
 260 void
 261 General_options::parse_library(const char*, const char* arg,
 262                                Command_line* cmdline)
 263 {
 264   Input_file_argument file(arg, true, "", false, *this);
 265   cmdline->inputs().add_file(file);
 266 }
 267
 268 void
 269 General_options::parse_R(const char* option, const char* arg,
 270                          Command_line* cmdline)
 271 {
 272   struct stat s;
 273   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 274     this->add_to_rpath(arg);
 275   else
 276     this->parse_just_symbols(option, arg, cmdline);
 277 }
 278
 279 void
 280 General_options::parse_just_symbols(const char*, const char* arg,
 281                                     Command_line* cmdline)
 282 {
 283   Input_file_argument file(arg, false, "", true, *this);
 284   cmdline->inputs().add_file(file);
 285 }
 286
 287 void
 288 General_options::parse_static(const char*, const char*, Command_line*)
 289 {
 290   this->set_static(true);
 291 }
 292
 293 void
 294 General_options::parse_script(const char*, const char* arg,
 295                               Command_line* cmdline)
 296 {
 297   if (!read_commandline_script(arg, cmdline))
 298     gold::gold_fatal(_("unable to parse script file %s"), arg);
 299 }
 300
 301 void
 302 General_options::parse_version_script(const char*, const char* arg,
 303                                       Command_line* cmdline)
 304 {
 305   if (!read_version_script(arg, cmdline))
 306     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 307 }
 308
 309 void
 310 General_options::parse_start_group(const char*, const char*,
 311                                    Command_line* cmdline)
 312 {
 313   cmdline->inputs().start_group();
 314 }
 315
 316 void
 317 General_options::parse_end_group(const char*, const char*,
 318                                  Command_line* cmdline)
 319 {
 320   cmdline->inputs().end_group();
 321 }
 322
 323 } // End namespace gold.
 324
 325 namespace
 326 {
 327
 328 void
 329 usage()
 330 {
 331   fprintf(stderr,
 332           _("%s: use the --help option for usage information\n"),
 333           gold::program_name);
 334   ::exit(EXIT_FAILURE);
 335 }
 336
 337 void
 338 usage(const char* msg, const char *opt)
 339 {
 340   fprintf(stderr,
 341           _("%s: %s: %s\n"),
 342           gold::program_name, opt, msg);
 343   usage();
 344 }
 345
 346 // Recognize input and output target names.  The GNU linker accepts
 347 // these with --format and --oformat.  This code is intended to be
 348 // minimally compatible.  In practice for an ELF target this would be
 349 // the same target as the input files; that name always start with
 350 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 351 // "binary", "ihex".
 352
 353 gold::General_options::Object_format
 354 string_to_object_format(const char* arg)
 355 {
 356   if (strncmp(arg, "elf", 3) == 0)
 357     return gold::General_options::OBJECT_FORMAT_ELF;
 358   else if (strcmp(arg, "binary") == 0)
 359     return gold::General_options::OBJECT_FORMAT_BINARY;
 360   else
 361     {
 362       gold::gold_error(_("format '%s' not supported; treating as elf "
 363                          "(supported formats: elf, binary)"),
 364                        arg);
 365       return gold::General_options::OBJECT_FORMAT_ELF;
 366     }
 367 }
 368
 369 // If the default sysroot is relocatable, try relocating it based on
 370 // the prefix FROM.
 371
 372 char*
 373 get_relative_sysroot(const char* from)
 374 {
 375   char* path = make_relative_prefix(gold::program_name, from,
 376                                     TARGET_SYSTEM_ROOT);
 377   if (path != NULL)
 378     {
 379       struct stat s;
 380       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 381         return path;
 382       free(path);
 383     }
 384
 385   return NULL;
 386 }
 387
 388 // Return the default sysroot.  This is set by the --with-sysroot
 389 // option to configure.  Note we do not free the return value of
 390 // get_relative_sysroot, which is a small memory leak, but is
 391 // necessary since we store this pointer directly in General_options.
 392
 393 const char*
 394 get_default_sysroot()
 395 {
 396   const char* sysroot = TARGET_SYSTEM_ROOT;
 397   if (*sysroot == '\0')
 398     return NULL;
 399
 400   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 401     {
 402       char* path = get_relative_sysroot(BINDIR);
 403       if (path == NULL)
 404         path = get_relative_sysroot(TOOLBINDIR);
 405       if (path != NULL)
 406         return path;
 407     }
 408
 409   return sysroot;
 410 }
 411
 412 // Parse a long option.  Such options have the form
 413 // <-|--><option>[=arg].  If "=arg" is not present but the option
 414 // takes an argument, the next word is taken to the be the argument.
 415 // If equals_only is set, then only the <option>=<arg> form is
 416 // accepted, not the <option><space><arg> form.  Returns a One_option
 417 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 418 // the not-NULL case, *arg is set to the option's argument (NULL if
 419 // the option takes no argument), and *i is advanced past this option.
 420 // NOTE: it is safe for argv and arg to point to the same place.
 421 gold::options::One_option*
 422 parse_long_option(int argc, const char** argv, bool equals_only,
 423                   const char** arg, int* i)
 424 {
 425   const char* const this_argv = argv[*i];
 426
 427   const char* equals = strchr(this_argv, '=');
 428   const char* option_start = this_argv + strspn(this_argv, "-");
 429   std::string option(option_start,
 430                      equals ? equals - option_start : strlen(option_start));
 431
 432   gold::options::Option_map::iterator it
 433       = gold::options::long_options->find(option);
 434   if (it == gold::options::long_options->end())
 435     return NULL;
 436
 437   gold::options::One_option* retval = it->second;
 438
 439   // If the dash-count doesn't match, we fail.
 440   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 441     {
 442       if (retval->dashes != gold::options::DASH_Z)
 443         return NULL;
 444     }
 445   else if (this_argv[1] != '-')   // one dash
 446     {
 447       if (retval->dashes != gold::options::ONE_DASH
 448           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 449           && retval->dashes != gold::options::TWO_DASHES)
 450         return NULL;
 451     }
 452   else                            // two dashes (or more!)
 453     {
 454       if (retval->dashes != gold::options::TWO_DASHES
 455           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 456           && retval->dashes != gold::options::ONE_DASH)
 457         return NULL;
 458     }
 459
 460   // Now that we know the option is good (or else bad in a way that
 461   // will cause us to die), increment i to point past this argv.
 462   ++(*i);
 463
 464   // Figure out the option's argument, if any.
 465   if (!retval->takes_argument())
 466     {
 467       if (equals)
 468         usage(_("unexpected argument"), this_argv);
 469       else
 470         *arg = NULL;
 471     }
 472   else
 473     {
 474       if (equals)
 475         *arg = equals + 1;
 476       else if (retval->takes_optional_argument())
 477         *arg = retval->default_value;
 478       else if (*i < argc && !equals_only)
 479         *arg = argv[(*i)++];
 480       else
 481         usage(_("missing argument"), this_argv);
 482     }
 483
 484   return retval;
 485 }
 486
 487 // Parse a short option.  Such options have the form -<option>[arg].
 488 // If "arg" is not present but the option takes an argument, the next
 489 // word is taken to the be the argument.  If the option does not take
 490 // an argument, it may be followed by another short option.  Returns a
 491 // One_option struct or NULL if argv[i] cannot be parsed as a short
 492 // option.  In the not-NULL case, *arg is set to the option's argument
 493 // (NULL if the option takes no argument), and *i is advanced past
 494 // this option.  This function keeps *i the same if we parsed a short
 495 // option that does not take an argument, that looks to be followed by
 496 // another short option in the same word.
 497 gold::options::One_option*
 498 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 499                    const char** arg, int* i)
 500 {
 501   const char* const this_argv = argv[*i];
 502
 503   if (this_argv[0] != '-')
 504     return NULL;
 505
 506   // We handle -z as a special case.
 507   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 508                                           'z', "", "-z", "Z-OPTION", false,
 509                                           NULL);
 510   gold::options::One_option* retval = NULL;
 511   if (this_argv[pos_in_argv_i] == 'z')
 512     retval = &dash_z;
 513   else
 514     {
 515       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 516       if (char_as_int > 0 && char_as_int < 128)
 517         retval = gold::options::short_options[char_as_int];
 518     }
 519
 520   if (retval == NULL)
 521     return NULL;
 522
 523   // Figure out the option's argument, if any.
 524   if (!retval->takes_argument())
 525     {
 526       *arg = NULL;
 527       // We only advance past this argument if it's the only one in argv.
 528       if (this_argv[pos_in_argv_i + 1] == '\0')
 529         ++(*i);
 530     }
 531   else
 532     {
 533       // If we take an argument, we'll eat up this entire argv entry.
 534       ++(*i);
 535       if (this_argv[pos_in_argv_i + 1] != '\0')
 536         *arg = this_argv + pos_in_argv_i + 1;
 537       else if (retval->takes_optional_argument())
 538         *arg = retval->default_value;
 539       else if (*i < argc)
 540         *arg = argv[(*i)++];
 541       else
 542         usage(_("missing argument"), this_argv);
 543     }
 544
 545   // If we're a -z option, we need to parse our argument as a
 546   // long-option, e.g. "-z stacksize=8192".
 547   if (retval == &dash_z)
 548     {
 549       int dummy_i = 0;
 550       const char* dash_z_arg = *arg;
 551       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 552       if (retval == NULL)
 553         usage(_("unknown -z option"), dash_z_arg);
 554     }
 555
 556   return retval;
 557 }
 558
 559 } // End anonymous namespace.
 560
 561 namespace gold
 562 {
 563
 564 General_options::General_options()
 565   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 566     do_demangle_(false)
 567 {
 568 }
 569
 570 General_options::Object_format
 571 General_options::format_enum() const
 572 {
 573   return string_to_object_format(this->format());
 574 }
 575
 576 General_options::Object_format
 577 General_options::oformat_enum() const
 578 {
 579   return string_to_object_format(this->oformat());
 580 }
 581
 582 // Add the sysroot, if any, to the search paths.
 583
 584 void
 585 General_options::add_sysroot()
 586 {
 587   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 588     {
 589       this->set_sysroot(get_default_sysroot());
 590       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 591         return;
 592     }
 593
 594   char* canonical_sysroot = lrealpath(this->sysroot());
 595
 596   for (Dir_list::iterator p = this->library_path_.value.begin();
 597        p != this->library_path_.value.end();
 598        ++p)
 599     p->add_sysroot(this->sysroot(), canonical_sysroot);
 600
 601   free(canonical_sysroot);
 602 }
 603
 604 // Set up variables and other state that isn't set up automatically by
 605 // the parse routine, and ensure options don't contradict each other
 606 // and are otherwise kosher.
 607
 608 void
 609 General_options::finalize()
 610 {
 611   // Normalize the strip modifiers.  They have a total order:
 612   // strip_all > strip_debug > strip_debug_gdb.  If one is true, set
 613   // all beneath it to true as well.
 614   if (this->strip_all())
 615     this->set_strip_debug(true);
 616   if (this->strip_debug())
 617     this->set_strip_debug_gdb(true);
 618
 619   // If the user specifies both -s and -r, convert the -s to -S.
 620   // -r requires us to keep externally visible symbols!
 621   if (this->strip_all() && this->relocatable())
 622     {
 623       this->set_strip_all(false);
 624       gold_assert(this->strip_debug());
 625     }
 626
 627   // For us, -dc and -dp are synonyms for --define-common.
 628   if (this->dc())
 629     this->set_define_common(true);
 630   if (this->dp())
 631     this->set_define_common(true);
 632
 633   // We also set --define-common if we're not relocatable, as long as
 634   // the user didn't explicitly ask for something different.
 635   if (!this->user_set_define_common())
 636     this->set_define_common(!this->relocatable());
 637
 638   // execstack_status_ is a three-state variable; update it based on
 639   // -z [no]execstack.
 640   if (this->execstack())
 641     this->set_execstack_status(EXECSTACK_YES);
 642   else if (this->noexecstack())
 643     this->set_execstack_status(EXECSTACK_NO);
 644
 645   // Handle the optional argument for --demangle.
 646   if (this->user_set_demangle())
 647     {
 648       this->set_do_demangle(true);
 649       const char* style = this->demangle();
 650       if (*style != '\0')
 651         {
 652           enum demangling_styles style_code;
 653
 654           style_code = cplus_demangle_name_to_style(style);
 655           if (style_code == unknown_demangling)
 656             gold_fatal("unknown demangling style '%s'", style);
 657           cplus_demangle_set_style(style_code);
 658         }
 659     }
 660   else if (this->user_set_no_demangle())
 661     this->set_do_demangle(false);
 662   else
 663     {
 664       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 665       // behaviour identical to that of gcc's linker wrapper.
 666       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 667     }
 668
 669   // If --thread_count is specified, it applies to
 670   // --thread-count-{initial,middle,final}, though it doesn't override
 671   // them.
 672   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 673     this->set_thread_count_initial(this->thread_count());
 674   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 675     this->set_thread_count_middle(this->thread_count());
 676   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 677     this->set_thread_count_final(this->thread_count());
 678
 679   // Let's warn if you set the thread-count but we're going to ignore it.
 680 #ifndef ENABLE_THREADS
 681   if (this->threads())
 682     {
 683       gold_warning(_("ignoring --threads: "
 684                      "%s was compiled without thread support"),
 685                    program_name);
 686       this->set_threads(false);
 687     }
 688   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 689       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 690     gold_warning(_("ignoring --thread-count: "
 691                    "%s was compiled without thread support"),
 692                  program_name);
 693 #endif
 694
 695   // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 696   // FIXME: We should only do this when configured in native mode.
 697   this->add_to_library_path_with_sysroot("/lib");
 698   this->add_to_library_path_with_sysroot("/usr/lib");
 699
 700   // Normalize library_path() by adding the sysroot to all directories
 701   // in the path, as appropriate.
 702   this->add_sysroot();
 703
 704   // Now that we've normalized the options, check for contradictory ones.
 705   if (this->shared() && this->relocatable())
 706     gold_fatal(_("-shared and -r are incompatible"));
 707
 708   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 709       && (this->shared() || this->relocatable()))
 710     gold_fatal(_("binary output format not compatible with -shared or -r"));
 711
 712   if (this->user_set_hash_bucket_empty_fraction()
 713       && (this->hash_bucket_empty_fraction() < 0.0
 714           || this->hash_bucket_empty_fraction() >= 1.0))
 715     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 716                  "[0.0, 1.0)"),
 717                this->hash_bucket_empty_fraction());
 718
 719   // FIXME: we can/should be doing a lot more sanity checking here.
 720 }
 721
 722 // Search_directory methods.
 723
 724 // This is called if we have a sysroot.  Apply the sysroot if
 725 // appropriate.  Record whether the directory is in the sysroot.
 726
 727 void
 728 Search_directory::add_sysroot(const char* sysroot,
 729                               const char* canonical_sysroot)
 730 {
 731   gold_assert(*sysroot != '\0');
 732   if (this->put_in_sysroot_)
 733     {
 734       if (!IS_DIR_SEPARATOR(this->name_[0])
 735           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 736         this->name_ = '/' + this->name_;
 737       this->name_ = sysroot + this->name_;
 738       this->is_in_sysroot_ = true;
 739     }
 740   else
 741     {
 742       // Check whether this entry is in the sysroot.  To do this
 743       // correctly, we need to use canonical names.  Otherwise we will
 744       // get confused by the ../../.. paths that gcc tends to use.
 745       char* canonical_name = lrealpath(this->name_.c_str());
 746       int canonical_name_len = strlen(canonical_name);
 747       int canonical_sysroot_len = strlen(canonical_sysroot);
 748       if (canonical_name_len > canonical_sysroot_len
 749           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 750         {
 751           canonical_name[canonical_sysroot_len] = '\0';
 752           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 753             this->is_in_sysroot_ = true;
 754         }
 755       free(canonical_name);
 756     }
 757 }
 758
 759 // Input_arguments methods.
 760
 761 // Add a file to the list.
 762
 763 void
 764 Input_arguments::add_file(const Input_file_argument& file)
 765 {
 766   if (!this->in_group_)
 767     this->input_argument_list_.push_back(Input_argument(file));
 768   else
 769     {
 770       gold_assert(!this->input_argument_list_.empty());
 771       gold_assert(this->input_argument_list_.back().is_group());
 772       this->input_argument_list_.back().group()->add_file(file);
 773     }
 774 }
 775
 776 // Start a group.
 777
 778 void
 779 Input_arguments::start_group()
 780 {
 781   if (this->in_group_)
 782     gold_fatal(_("May not nest groups"));
 783   Input_file_group* group = new Input_file_group();
 784   this->input_argument_list_.push_back(Input_argument(group));
 785   this->in_group_ = true;
 786 }
 787
 788 // End a group.
 789
 790 void
 791 Input_arguments::end_group()
 792 {
 793   if (!this->in_group_)
 794     gold_fatal(_("Group end without group start"));
 795   this->in_group_ = false;
 796 }
 797
 798 // Command_line options.
 799
 800 Command_line::Command_line()
 801 {
 802 }
 803
 804 // Process the command line options.  For process_one_option, i is the
 805 // index of argv to process next, and must be an option (that is,
 806 // start with a dash).  The return value is the index of the next
 807 // option to process (i+1 or i+2, or argc to indicate processing is
 808 // done).  no_more_options is set to true if (and when) "--" is seen
 809 // as an option.
 810
 811 int
 812 Command_line::process_one_option(int argc, const char** argv, int i,
 813                                  bool* no_more_options)
 814 {
 815   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 816
 817   // If we are reading "--", then just set no_more_options and return.
 818   if (argv[i][1] == '-' && argv[i][2] == '\0')
 819     {
 820       *no_more_options = true;
 821       return i + 1;
 822     }
 823
 824   int new_i = i;
 825   options::One_option* option = NULL;
 826   const char* arg = NULL;
 827
 828   // First, try to process argv as a long option.
 829   option = parse_long_option(argc, argv, false, &arg, &new_i);
 830   if (option)
 831     {
 832       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 833       return new_i;
 834     }
 835
 836   // Now, try to process argv as a short option.  Since several short
 837   // options can be combined in one argv, we may have to parse a lot
 838   // until we're done reading this argv.
 839   int pos_in_argv_i = 1;
 840   while (new_i == i)
 841     {
 842       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 843       if (!option)
 844         break;
 845       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 846       ++pos_in_argv_i;
 847     }
 848   if (option)
 849     return new_i;
 850
 851   // I guess it's neither a long option nor a short option.
 852   usage(_("unknown option"), argv[i]);
 853   return argc;
 854 }
 855
 856
 857 void
 858 Command_line::process(int argc, const char** argv)
 859 {
 860   bool no_more_options = false;
 861   int i = 0;
 862   while (i < argc)
 863     {
 864       this->position_options_.copy_from_options(this->options());
 865       if (no_more_options || argv[i][0] != '-')
 866         {
 867           Input_file_argument file(argv[i], false, "", false,
 868                                    this->position_options_);
 869           this->inputs_.add_file(file);
 870           ++i;
 871         }
 872       else
 873         i = process_one_option(argc, argv, i, &no_more_options);
 874     }
 875
 876   if (this->inputs_.in_group())
 877     {
 878       fprintf(stderr, _("%s: missing group end\n"), program_name);
 879       usage();
 880     }
 881
 882   // Normalize the options and ensure they don't contradict each other.
 883   this->options_.finalize();
 884 }
 885
 886 } // End namespace gold.