gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright (C) 2006-2015 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 <cerrno>
  26 #include <cstdlib>
  27 #include <cstring>
  28 #include <fstream>
  29 #include <vector>
  30 #include <iostream>
  31 #include <sys/stat.h>
  32 #include "filenames.h"
  33 #include "libiberty.h"
  34 #include "demangle.h"
  35 #include "../bfd/bfdver.h"
  36
  37 #include "debug.h"
  38 #include "script.h"
  39 #include "target-select.h"
  40 #include "options.h"
  41 #include "plugin.h"
  42
  43 namespace gold
  44 {
  45
  46 General_options
  47 Position_dependent_options::default_options_;
  48
  49 namespace options
  50 {
  51
  52 // This flag is TRUE if we should register the command-line options as they
  53 // are constructed.  It is set after construction of the options within
  54 // class Position_dependent_options.
  55 static bool ready_to_register = false;
  56
  57 // This global variable is set up as General_options is constructed.
  58 static std::vector<const One_option*> registered_options;
  59
  60 // These are set up at the same time -- the variables that accept one
  61 // dash, two, or require -z.  A single variable may be in more than
  62 // one of these data structures.
  63 typedef Unordered_map<std::string, One_option*> Option_map;
  64 static Option_map* long_options = NULL;
  65 static One_option* short_options[128];
  66
  67 void
  68 One_option::register_option()
  69 {
  70   if (!ready_to_register)
  71     return;
  72
  73   registered_options.push_back(this);
  74
  75   // We can't make long_options a static Option_map because we can't
  76   // guarantee that will be initialized before register_option() is
  77   // first called.
  78   if (long_options == NULL)
  79     long_options = new Option_map;
  80
  81   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  82   if (!this->longname.empty())
  83     (*long_options)[this->longname] = this;
  84
  85   const int shortname_as_int = static_cast<int>(this->shortname);
  86   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  87   if (this->shortname != '\0')
  88     {
  89       gold_assert(short_options[shortname_as_int] == NULL);
  90       short_options[shortname_as_int] = this;
  91     }
  92 }
  93
  94 void
  95 One_option::print() const
  96 {
  97   bool comma = false;
  98   printf("  ");
  99   int len = 2;
 100   if (this->shortname != '\0')
 101     {
 102       len += printf("-%c", this->shortname);
 103       if (this->helparg)
 104         {
 105           // -z takes long-names only.
 106           gold_assert(this->dashes != DASH_Z);
 107           len += printf(" %s", gettext(this->helparg));
 108         }
 109       comma = true;
 110     }
 111   if (!this->longname.empty()
 112       && !(this->longname[0] == this->shortname
 113            && this->longname[1] == '\0'))
 114     {
 115       if (comma)
 116         len += printf(", ");
 117       switch (this->dashes)
 118         {
 119         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 120           len += printf("-");
 121           break;
 122         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 123           len += printf("--");
 124           break;
 125         case options::DASH_Z:
 126           len += printf("-z ");
 127           break;
 128         default:
 129           gold_unreachable();
 130         }
 131       len += printf("%s", this->longname.c_str());
 132       if (this->helparg)
 133         {
 134           // For most options, we print "--frob FOO".  But for -z
 135           // we print "-z frob=FOO".
 136           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 137                         gettext(this->helparg));
 138         }
 139     }
 140
 141   if (len >= 30)
 142     {
 143       printf("\n");
 144       len = 0;
 145     }
 146   for (; len < 30; ++len)
 147     std::putchar(' ');
 148
 149   // TODO: if we're boolean, add " (default)" when appropriate.
 150   printf("%s\n", gettext(this->helpstring));
 151 }
 152
 153 void
 154 help()
 155 {
 156   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 157
 158   std::vector<const One_option*>::const_iterator it;
 159   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 160     (*it)->print();
 161
 162   // config.guess and libtool.m4 look in ld --help output for the
 163   // string "supported targets".
 164   printf(_("%s: supported targets:"), gold::program_name);
 165   std::vector<const char*> supported_names;
 166   gold::supported_target_names(&supported_names);
 167   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 168        p != supported_names.end();
 169        ++p)
 170     printf(" %s", *p);
 171   printf("\n");
 172
 173   printf(_("%s: supported emulations:"), gold::program_name);
 174   supported_names.clear();
 175   gold::supported_emulation_names(&supported_names);
 176   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 177        p != supported_names.end();
 178        ++p)
 179     printf(" %s", *p);
 180   printf("\n");
 181
 182   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
 183   const char* report = REPORT_BUGS_TO;
 184   if (*report != '\0')
 185     printf(_("Report bugs to %s\n"), report);
 186 }
 187
 188 // For bool, arg will be NULL (boolean options take no argument);
 189 // we always just set to true.
 190 void
 191 parse_bool(const char*, const char*, bool* retval)
 192 {
 193   *retval = true;
 194 }
 195
 196 void
 197 parse_uint(const char* option_name, const char* arg, int* retval)
 198 {
 199   char* endptr;
 200   *retval = strtol(arg, &endptr, 0);
 201   if (*endptr != '\0' || *retval < 0)
 202     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 203                option_name, arg);
 204 }
 205
 206 void
 207 parse_int(const char* option_name, const char* arg, int* retval)
 208 {
 209   char* endptr;
 210   *retval = strtol(arg, &endptr, 0);
 211   if (*endptr != '\0')
 212     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 213                option_name, arg);
 214 }
 215
 216 void
 217 parse_uint64(const char* option_name, const char* arg, uint64_t* retval)
 218 {
 219   char* endptr;
 220   *retval = strtoull(arg, &endptr, 0);
 221   if (*endptr != '\0')
 222     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 223                option_name, arg);
 224 }
 225
 226 void
 227 parse_double(const char* option_name, const char* arg, double* retval)
 228 {
 229   char* endptr;
 230   *retval = strtod(arg, &endptr);
 231   if (*endptr != '\0')
 232     gold_fatal(_("%s: invalid option value "
 233                  "(expected a floating point number): %s"),
 234                option_name, arg);
 235 }
 236
 237 void
 238 parse_percent(const char* option_name, const char* arg, double* retval)
 239 {
 240   char* endptr;
 241   *retval = strtod(arg, &endptr) / 100.0;
 242   if (*endptr != '\0')
 243     gold_fatal(_("%s: invalid option value "
 244                  "(expected a floating point number): %s"),
 245                option_name, arg);
 246 }
 247
 248 void
 249 parse_string(const char* option_name, const char* arg, const char** retval)
 250 {
 251   if (*arg == '\0')
 252     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 253   *retval = arg;
 254 }
 255
 256 void
 257 parse_optional_string(const char*, const char* arg, const char** retval)
 258 {
 259   *retval = arg;
 260 }
 261
 262 void
 263 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 264 {
 265   retval->push_back(Search_directory(arg, false));
 266 }
 267
 268 void
 269 parse_set(const char*, const char* arg, String_set* retval)
 270 {
 271   retval->insert(std::string(arg));
 272 }
 273
 274 void
 275 parse_choices(const char* option_name, const char* arg, const char** retval,
 276               const char* choices[], int num_choices)
 277 {
 278   for (int i = 0; i < num_choices; i++)
 279     if (strcmp(choices[i], arg) == 0)
 280       {
 281         *retval = arg;
 282         return;
 283       }
 284
 285   // If we get here, the user did not enter a valid choice, so we die.
 286   std::string choices_list;
 287   for (int i = 0; i < num_choices; i++)
 288     {
 289       choices_list += choices[i];
 290       if (i != num_choices - 1)
 291         choices_list += ", ";
 292     }
 293   gold_fatal(_("%s: must take one of the following arguments: %s"),
 294              option_name, choices_list.c_str());
 295 }
 296
 297 } // End namespace options.
 298
 299 // Define the handler for "special" options (set via DEFINE_special).
 300
 301 void
 302 General_options::parse_help(const char*, const char*, Command_line*)
 303 {
 304   options::help();
 305   ::exit(EXIT_SUCCESS);
 306 }
 307
 308 void
 309 General_options::parse_version(const char* opt, const char*, Command_line*)
 310 {
 311   bool print_short = (opt[0] == '-' && opt[1] == 'v');
 312   gold::print_version(print_short);
 313   this->printed_version_ = true;
 314   if (!print_short)
 315     ::exit(EXIT_SUCCESS);
 316 }
 317
 318 void
 319 General_options::parse_V(const char*, const char*, Command_line*)
 320 {
 321   gold::print_version(true);
 322   this->printed_version_ = true;
 323
 324   printf(_("  Supported targets:\n"));
 325   std::vector<const char*> supported_names;
 326   gold::supported_target_names(&supported_names);
 327   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 328        p != supported_names.end();
 329        ++p)
 330     printf("   %s\n", *p);
 331
 332   printf(_("  Supported emulations:\n"));
 333   supported_names.clear();
 334   gold::supported_emulation_names(&supported_names);
 335   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 336        p != supported_names.end();
 337        ++p)
 338     printf("   %s\n", *p);
 339 }
 340
 341 void
 342 General_options::parse_defsym(const char*, const char* arg,
 343                               Command_line* cmdline)
 344 {
 345   cmdline->script_options().define_symbol(arg);
 346 }
 347
 348 void
 349 General_options::parse_discard_all(const char*, const char*,
 350                                    Command_line*)
 351 {
 352   this->discard_locals_ = DISCARD_ALL;
 353 }
 354
 355 void
 356 General_options::parse_discard_locals(const char*, const char*,
 357                                       Command_line*)
 358 {
 359   this->discard_locals_ = DISCARD_LOCALS;
 360 }
 361
 362 void
 363 General_options::parse_discard_none(const char*, const char*,
 364                                     Command_line*)
 365 {
 366   this->discard_locals_ = DISCARD_NONE;
 367 }
 368
 369 void
 370 General_options::parse_incremental(const char*, const char*,
 371                                    Command_line*)
 372 {
 373   this->incremental_mode_ = INCREMENTAL_AUTO;
 374 }
 375
 376 void
 377 General_options::parse_no_incremental(const char*, const char*,
 378                                       Command_line*)
 379 {
 380   this->incremental_mode_ = INCREMENTAL_OFF;
 381 }
 382
 383 void
 384 General_options::parse_incremental_full(const char*, const char*,
 385                                         Command_line*)
 386 {
 387   this->incremental_mode_ = INCREMENTAL_FULL;
 388 }
 389
 390 void
 391 General_options::parse_incremental_update(const char*, const char*,
 392                                           Command_line*)
 393 {
 394   this->incremental_mode_ = INCREMENTAL_UPDATE;
 395 }
 396
 397 void
 398 General_options::parse_incremental_changed(const char*, const char*,
 399                                            Command_line*)
 400 {
 401   this->implicit_incremental_ = true;
 402   this->incremental_disposition_ = INCREMENTAL_CHANGED;
 403 }
 404
 405 void
 406 General_options::parse_incremental_unchanged(const char*, const char*,
 407                                              Command_line*)
 408 {
 409   this->implicit_incremental_ = true;
 410   this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
 411 }
 412
 413 void
 414 General_options::parse_incremental_unknown(const char*, const char*,
 415                                            Command_line*)
 416 {
 417   this->implicit_incremental_ = true;
 418   this->incremental_disposition_ = INCREMENTAL_CHECK;
 419 }
 420
 421 void
 422 General_options::parse_incremental_startup_unchanged(const char*, const char*,
 423                                                      Command_line*)
 424 {
 425   this->implicit_incremental_ = true;
 426   this->incremental_startup_disposition_ = INCREMENTAL_UNCHANGED;
 427 }
 428
 429 void
 430 General_options::parse_library(const char*, const char* arg,
 431                                Command_line* cmdline)
 432 {
 433   Input_file_argument::Input_file_type type;
 434   const char* name;
 435   if (arg[0] == ':')
 436     {
 437       type = Input_file_argument::INPUT_FILE_TYPE_SEARCHED_FILE;
 438       name = arg + 1;
 439     }
 440   else
 441     {
 442       type = Input_file_argument::INPUT_FILE_TYPE_LIBRARY;
 443       name = arg;
 444     }
 445   Input_file_argument file(name, type, "", false, *this);
 446   cmdline->inputs().add_file(file);
 447 }
 448
 449 #ifdef ENABLE_PLUGINS
 450 void
 451 General_options::parse_plugin(const char*, const char* arg,
 452                               Command_line*)
 453 {
 454   this->add_plugin(arg);
 455 }
 456
 457 // Parse --plugin-opt.
 458
 459 void
 460 General_options::parse_plugin_opt(const char*, const char* arg,
 461                                   Command_line*)
 462 {
 463   this->add_plugin_option(arg);
 464 }
 465 #endif // ENABLE_PLUGINS
 466
 467 void
 468 General_options::parse_R(const char* option, const char* arg,
 469                          Command_line* cmdline)
 470 {
 471   struct stat s;
 472   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 473     this->add_to_rpath(arg);
 474   else
 475     this->parse_just_symbols(option, arg, cmdline);
 476 }
 477
 478 void
 479 General_options::parse_just_symbols(const char*, const char* arg,
 480                                     Command_line* cmdline)
 481 {
 482   Input_file_argument file(arg, Input_file_argument::INPUT_FILE_TYPE_FILE,
 483                            "", true, *this);
 484   cmdline->inputs().add_file(file);
 485 }
 486
 487 // Handle --section-start.
 488
 489 void
 490 General_options::parse_section_start(const char*, const char* arg,
 491                                      Command_line*)
 492 {
 493   const char* eq = strchr(arg, '=');
 494   if (eq == NULL)
 495     {
 496       gold_error(_("invalid argument to --section-start; "
 497                    "must be SECTION=ADDRESS"));
 498       return;
 499     }
 500
 501   std::string section_name(arg, eq - arg);
 502
 503   ++eq;
 504   const char* val_start = eq;
 505   if (eq[0] == '0' && (eq[1] == 'x' || eq[1] == 'X'))
 506     eq += 2;
 507   if (*eq == '\0')
 508     {
 509       gold_error(_("--section-start address missing"));
 510       return;
 511     }
 512   uint64_t addr = 0;
 513   hex_init();
 514   for (; *eq != '\0'; ++eq)
 515     {
 516       if (!hex_p(*eq))
 517         {
 518           gold_error(_("--section-start argument %s is not a valid hex number"),
 519                      val_start);
 520           return;
 521         }
 522       addr <<= 4;
 523       addr += hex_value(*eq);
 524     }
 525
 526   this->section_starts_[section_name] = addr;
 527 }
 528
 529 // Look up a --section-start value.
 530
 531 bool
 532 General_options::section_start(const char* secname, uint64_t* paddr) const
 533 {
 534   if (this->section_starts_.empty())
 535     return false;
 536   std::map<std::string, uint64_t>::const_iterator p =
 537     this->section_starts_.find(secname);
 538   if (p == this->section_starts_.end())
 539     return false;
 540   *paddr = p->second;
 541   return true;
 542 }
 543
 544 void
 545 General_options::parse_static(const char*, const char*, Command_line*)
 546 {
 547   this->set_static(true);
 548 }
 549
 550 void
 551 General_options::parse_script(const char*, const char* arg,
 552                               Command_line* cmdline)
 553 {
 554   if (!read_commandline_script(arg, cmdline))
 555     gold::gold_fatal(_("unable to parse script file %s"), arg);
 556 }
 557
 558 void
 559 General_options::parse_version_script(const char*, const char* arg,
 560                                       Command_line* cmdline)
 561 {
 562   if (!read_version_script(arg, cmdline))
 563     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 564 }
 565
 566 void
 567 General_options::parse_dynamic_list(const char*, const char* arg,
 568                                     Command_line* cmdline)
 569 {
 570   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 571     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 572   this->have_dynamic_list_ = true;
 573 }
 574
 575 void
 576 General_options::parse_start_group(const char*, const char*,
 577                                    Command_line* cmdline)
 578 {
 579   cmdline->inputs().start_group();
 580 }
 581
 582 void
 583 General_options::parse_end_group(const char*, const char*,
 584                                  Command_line* cmdline)
 585 {
 586   cmdline->inputs().end_group();
 587 }
 588
 589 void
 590 General_options::parse_start_lib(const char*, const char*,
 591                                  Command_line* cmdline)
 592 {
 593   cmdline->inputs().start_lib(cmdline->position_dependent_options());
 594 }
 595
 596 void
 597 General_options::parse_end_lib(const char*, const char*,
 598                                Command_line* cmdline)
 599 {
 600   cmdline->inputs().end_lib();
 601 }
 602
 603 // The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
 604 // of names separated by commas or colons and puts them in a linked list.
 605 // We implement the same parsing of names here but store names in an unordered
 606 // map to speed up searching of names.
 607
 608 void
 609 General_options::parse_exclude_libs(const char*, const char* arg,
 610                                     Command_line*)
 611 {
 612   const char* p = arg;
 613
 614   while (*p != '\0')
 615     {
 616       size_t length = strcspn(p, ",:");
 617       this->excluded_libs_.insert(std::string(p, length));
 618       p += (p[length] ? length + 1 : length);
 619     }
 620 }
 621
 622 // The checking logic is based on the function check_excluded_libs() in
 623 // ld/ldlang.c of GNU ld but our implementation is different because we use
 624 // an unordered map instead of a linked list, which is what GNU ld uses.  GNU
 625 // ld searches sequentially in the excluded libs list.  For a given archive,
 626 // a match is found if the archive's name matches exactly one of the list
 627 // entry or if the archive's name is of the form FOO.a and FOO matches exactly
 628 // one of the list entry.  An entry "ALL" in the list is considered as a
 629 // wild-card and matches any given name.
 630
 631 bool
 632 General_options::check_excluded_libs(const std::string &name) const
 633 {
 634   Unordered_set<std::string>::const_iterator p;
 635
 636   // Exit early for the most common case.
 637   if (excluded_libs_.empty())
 638     return false;
 639
 640   // If we see "ALL", all archives are excluded from automatic export.
 641   p = excluded_libs_.find(std::string("ALL"));
 642   if (p != excluded_libs_.end())
 643     return true;
 644
 645   // First strip off any directories in name.
 646   const char* basename = lbasename(name.c_str());
 647
 648   // Try finding an exact match.
 649   p = excluded_libs_.find(std::string(basename));
 650   if (p != excluded_libs_.end())
 651     return true;
 652
 653   // Try matching NAME without ".a" at the end.
 654   size_t length = strlen(basename);
 655   if ((length >= 2)
 656       && (basename[length - 2] == '.')
 657       && (basename[length - 1] == 'a'))
 658     {
 659       p = excluded_libs_.find(std::string(basename, length - 2));
 660       if (p != excluded_libs_.end())
 661         return true;
 662     }
 663
 664   return false;
 665 }
 666
 667 // Recognize input and output target names.  The GNU linker accepts
 668 // these with --format and --oformat.  This code is intended to be
 669 // minimally compatible.  In practice for an ELF target this would be
 670 // the same target as the input files; that name always start with
 671 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 672 // "binary", "ihex".
 673
 674 General_options::Object_format
 675 General_options::string_to_object_format(const char* arg)
 676 {
 677   if (strncmp(arg, "elf", 3) == 0 || strcmp(arg, "default") == 0)
 678     return gold::General_options::OBJECT_FORMAT_ELF;
 679   else if (strcmp(arg, "binary") == 0)
 680     return gold::General_options::OBJECT_FORMAT_BINARY;
 681   else
 682     {
 683       gold::gold_error(_("format '%s' not supported; treating as elf "
 684                          "(supported formats: elf, binary)"),
 685                        arg);
 686       return gold::General_options::OBJECT_FORMAT_ELF;
 687     }
 688 }
 689
 690 void
 691 General_options::parse_fix_v4bx(const char*, const char*,
 692                                 Command_line*)
 693 {
 694   this->fix_v4bx_ = FIX_V4BX_REPLACE;
 695 }
 696
 697 void
 698 General_options::parse_fix_v4bx_interworking(const char*, const char*,
 699                                              Command_line*)
 700 {
 701   this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
 702 }
 703
 704 void
 705 General_options::parse_EB(const char*, const char*, Command_line*)
 706 {
 707   this->endianness_ = ENDIANNESS_BIG;
 708 }
 709
 710 void
 711 General_options::parse_EL(const char*, const char*, Command_line*)
 712 {
 713   this->endianness_ = ENDIANNESS_LITTLE;
 714 }
 715
 716 } // End namespace gold.
 717
 718 namespace
 719 {
 720
 721 void
 722 usage()
 723 {
 724   fprintf(stderr,
 725           _("%s: use the --help option for usage information\n"),
 726           gold::program_name);
 727   ::exit(EXIT_FAILURE);
 728 }
 729
 730 void
 731 usage(const char* msg, const char* opt)
 732 {
 733   fprintf(stderr,
 734           _("%s: %s: %s\n"),
 735           gold::program_name, opt, msg);
 736   usage();
 737 }
 738
 739 // If the default sysroot is relocatable, try relocating it based on
 740 // the prefix FROM.
 741
 742 static char*
 743 get_relative_sysroot(const char* from)
 744 {
 745   char* path = make_relative_prefix(gold::program_name, from,
 746                                     TARGET_SYSTEM_ROOT);
 747   if (path != NULL)
 748     {
 749       struct stat s;
 750       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 751         return path;
 752       free(path);
 753     }
 754
 755   return NULL;
 756 }
 757
 758 // Return the default sysroot.  This is set by the --with-sysroot
 759 // option to configure.  Note we do not free the return value of
 760 // get_relative_sysroot, which is a small memory leak, but is
 761 // necessary since we store this pointer directly in General_options.
 762
 763 static const char*
 764 get_default_sysroot()
 765 {
 766   const char* sysroot = TARGET_SYSTEM_ROOT;
 767   if (*sysroot == '\0')
 768     return NULL;
 769
 770   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 771     {
 772       char* path = get_relative_sysroot(BINDIR);
 773       if (path == NULL)
 774         path = get_relative_sysroot(TOOLBINDIR);
 775       if (path != NULL)
 776         return path;
 777     }
 778
 779   return sysroot;
 780 }
 781
 782 // Parse a long option.  Such options have the form
 783 // <-|--><option>[=arg].  If "=arg" is not present but the option
 784 // takes an argument, the next word is taken to the be the argument.
 785 // If equals_only is set, then only the <option>=<arg> form is
 786 // accepted, not the <option><space><arg> form.  Returns a One_option
 787 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 788 // the not-NULL case, *arg is set to the option's argument (NULL if
 789 // the option takes no argument), and *i is advanced past this option.
 790 // NOTE: it is safe for argv and arg to point to the same place.
 791 gold::options::One_option*
 792 parse_long_option(int argc, const char** argv, bool equals_only,
 793                   const char** arg, int* i)
 794 {
 795   const char* const this_argv = argv[*i];
 796
 797   const char* equals = strchr(this_argv, '=');
 798   const char* option_start = this_argv + strspn(this_argv, "-");
 799   std::string option(option_start,
 800                      equals ? equals - option_start : strlen(option_start));
 801
 802   gold::options::Option_map::iterator it
 803       = gold::options::long_options->find(option);
 804   if (it == gold::options::long_options->end())
 805     return NULL;
 806
 807   gold::options::One_option* retval = it->second;
 808
 809   // If the dash-count doesn't match, we fail.
 810   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 811     {
 812       if (retval->dashes != gold::options::DASH_Z)
 813         return NULL;
 814     }
 815   else if (this_argv[1] != '-')   // one dash
 816     {
 817       if (retval->dashes != gold::options::ONE_DASH
 818           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 819           && retval->dashes != gold::options::TWO_DASHES)
 820         return NULL;
 821     }
 822   else                            // two dashes (or more!)
 823     {
 824       if (retval->dashes != gold::options::TWO_DASHES
 825           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 826           && retval->dashes != gold::options::ONE_DASH)
 827         return NULL;
 828     }
 829
 830   // Now that we know the option is good (or else bad in a way that
 831   // will cause us to die), increment i to point past this argv.
 832   ++(*i);
 833
 834   // Figure out the option's argument, if any.
 835   if (!retval->takes_argument())
 836     {
 837       if (equals)
 838         usage(_("unexpected argument"), this_argv);
 839       else
 840         *arg = NULL;
 841     }
 842   else
 843     {
 844       if (equals)
 845         *arg = equals + 1;
 846       else if (retval->takes_optional_argument())
 847         *arg = retval->default_value;
 848       else if (*i < argc && !equals_only)
 849         *arg = argv[(*i)++];
 850       else
 851         usage(_("missing argument"), this_argv);
 852     }
 853
 854   return retval;
 855 }
 856
 857 // Parse a short option.  Such options have the form -<option>[arg].
 858 // If "arg" is not present but the option takes an argument, the next
 859 // word is taken to the be the argument.  If the option does not take
 860 // an argument, it may be followed by another short option.  Returns a
 861 // One_option struct or NULL if argv[i] cannot be parsed as a short
 862 // option.  In the not-NULL case, *arg is set to the option's argument
 863 // (NULL if the option takes no argument), and *i is advanced past
 864 // this option.  This function keeps *i the same if we parsed a short
 865 // option that does not take an argument, that looks to be followed by
 866 // another short option in the same word.
 867 gold::options::One_option*
 868 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 869                    const char** arg, int* i)
 870 {
 871   const char* const this_argv = argv[*i];
 872
 873   if (this_argv[0] != '-')
 874     return NULL;
 875
 876   // We handle -z as a special case.
 877   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 878                                           'z', "", NULL, "Z-OPTION", false,
 879                                           NULL);
 880   gold::options::One_option* retval = NULL;
 881   if (this_argv[pos_in_argv_i] == 'z')
 882     retval = &dash_z;
 883   else
 884     {
 885       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 886       if (char_as_int > 0 && char_as_int < 128)
 887         retval = gold::options::short_options[char_as_int];
 888     }
 889
 890   if (retval == NULL)
 891     return NULL;
 892
 893   // Figure out the option's argument, if any.
 894   if (!retval->takes_argument())
 895     {
 896       *arg = NULL;
 897       // We only advance past this argument if it's the only one in argv.
 898       if (this_argv[pos_in_argv_i + 1] == '\0')
 899         ++(*i);
 900     }
 901   else
 902     {
 903       // If we take an argument, we'll eat up this entire argv entry.
 904       ++(*i);
 905       if (this_argv[pos_in_argv_i + 1] != '\0')
 906         *arg = this_argv + pos_in_argv_i + 1;
 907       else if (retval->takes_optional_argument())
 908         *arg = retval->default_value;
 909       else if (*i < argc)
 910         *arg = argv[(*i)++];
 911       else
 912         usage(_("missing argument"), this_argv);
 913     }
 914
 915   // If we're a -z option, we need to parse our argument as a
 916   // long-option, e.g. "-z stacksize=8192".
 917   if (retval == &dash_z)
 918     {
 919       int dummy_i = 0;
 920       const char* dash_z_arg = *arg;
 921       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 922       if (retval == NULL)
 923         usage(_("unknown -z option"), dash_z_arg);
 924     }
 925
 926   return retval;
 927 }
 928
 929 } // End anonymous namespace.
 930
 931 namespace gold
 932 {
 933
 934 General_options::General_options()
 935   : printed_version_(false),
 936     execstack_status_(EXECSTACK_FROM_INPUT),
 937     icf_status_(ICF_NONE),
 938     static_(false),
 939     do_demangle_(false),
 940     plugins_(NULL),
 941     dynamic_list_(),
 942     have_dynamic_list_(false),
 943     incremental_mode_(INCREMENTAL_OFF),
 944     incremental_disposition_(INCREMENTAL_STARTUP),
 945     incremental_startup_disposition_(INCREMENTAL_CHECK),
 946     implicit_incremental_(false),
 947     excluded_libs_(),
 948     symbols_to_retain_(),
 949     section_starts_(),
 950     fix_v4bx_(FIX_V4BX_NONE),
 951     endianness_(ENDIANNESS_NOT_SET),
 952     discard_locals_(DISCARD_SEC_MERGE)
 953 {
 954   // Turn off option registration once construction is complete.
 955   gold::options::ready_to_register = false;
 956 }
 957
 958 General_options::Object_format
 959 General_options::format_enum() const
 960 {
 961   return General_options::string_to_object_format(this->format());
 962 }
 963
 964 General_options::Object_format
 965 General_options::oformat_enum() const
 966 {
 967   return General_options::string_to_object_format(this->oformat());
 968 }
 969
 970 // Add the sysroot, if any, to the search paths.
 971
 972 void
 973 General_options::add_sysroot()
 974 {
 975   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 976     {
 977       this->set_sysroot(get_default_sysroot());
 978       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 979         return;
 980     }
 981
 982   char* canonical_sysroot = lrealpath(this->sysroot());
 983
 984   for (Dir_list::iterator p = this->library_path_.value.begin();
 985        p != this->library_path_.value.end();
 986        ++p)
 987     p->add_sysroot(this->sysroot(), canonical_sysroot);
 988
 989   free(canonical_sysroot);
 990 }
 991
 992 // Return whether FILENAME is in a system directory.
 993
 994 bool
 995 General_options::is_in_system_directory(const std::string& filename) const
 996 {
 997   for (Dir_list::const_iterator p = this->library_path_.value.begin();
 998        p != this->library_path_.value.end();
 999        ++p)
1000     {
1001       // We use a straight string comparison rather than calling
1002       // FILENAME_CMP because we are only interested in the cases
1003       // where we found the file in a system directory, which means
1004       // that we used the directory name as a prefix for a -L search.
1005       if (p->is_system_directory()
1006           && filename.compare(0, p->name().size(), p->name()) == 0)
1007         return true;
1008     }
1009   return false;
1010 }
1011
1012 // Add a plugin to the list of plugins.
1013
1014 void
1015 General_options::add_plugin(const char* filename)
1016 {
1017   if (this->plugins_ == NULL)
1018     this->plugins_ = new Plugin_manager(*this);
1019   this->plugins_->add_plugin(filename);
1020 }
1021
1022 // Add a plugin option to a plugin.
1023
1024 void
1025 General_options::add_plugin_option(const char* arg)
1026 {
1027   if (this->plugins_ == NULL)
1028     gold_fatal("--plugin-opt requires --plugin.");
1029   this->plugins_->add_plugin_option(arg);
1030 }
1031
1032 // Set up variables and other state that isn't set up automatically by
1033 // the parse routine, and ensure options don't contradict each other
1034 // and are otherwise kosher.
1035
1036 void
1037 General_options::finalize()
1038 {
1039   // Normalize the strip modifiers.  They have a total order:
1040   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
1041   // If one is true, set all beneath it to true as well.
1042   if (this->strip_all())
1043     this->set_strip_debug(true);
1044   if (this->strip_debug())
1045     this->set_strip_debug_non_line(true);
1046   if (this->strip_debug_non_line())
1047     this->set_strip_debug_gdb(true);
1048
1049   if (this->Bshareable())
1050     this->set_shared(true);
1051
1052   // If the user specifies both -s and -r, convert the -s to -S.
1053   // -r requires us to keep externally visible symbols!
1054   if (this->strip_all() && this->relocatable())
1055     {
1056       this->set_strip_all(false);
1057       gold_assert(this->strip_debug());
1058     }
1059
1060   // For us, -dc and -dp are synonyms for --define-common.
1061   if (this->dc())
1062     this->set_define_common(true);
1063   if (this->dp())
1064     this->set_define_common(true);
1065
1066   // We also set --define-common if we're not relocatable, as long as
1067   // the user didn't explicitly ask for something different.
1068   if (!this->user_set_define_common())
1069     this->set_define_common(!this->relocatable());
1070
1071   // execstack_status_ is a three-state variable; update it based on
1072   // -z [no]execstack.
1073   if (this->execstack())
1074     this->set_execstack_status(EXECSTACK_YES);
1075   else if (this->noexecstack())
1076     this->set_execstack_status(EXECSTACK_NO);
1077
1078   // icf_status_ is a three-state variable; update it based on the
1079   // value of this->icf().
1080   if (strcmp(this->icf(), "none") == 0)
1081     this->set_icf_status(ICF_NONE);
1082   else if (strcmp(this->icf(), "safe") == 0)
1083     this->set_icf_status(ICF_SAFE);
1084   else
1085     this->set_icf_status(ICF_ALL);
1086
1087   // Handle the optional argument for --demangle.
1088   if (this->user_set_demangle())
1089     {
1090       this->set_do_demangle(true);
1091       const char* style = this->demangle();
1092       if (*style != '\0')
1093         {
1094           enum demangling_styles style_code;
1095
1096           style_code = cplus_demangle_name_to_style(style);
1097           if (style_code == unknown_demangling)
1098             gold_fatal("unknown demangling style '%s'", style);
1099           cplus_demangle_set_style(style_code);
1100         }
1101     }
1102   else if (this->user_set_no_demangle())
1103     this->set_do_demangle(false);
1104   else
1105     {
1106       // Testing COLLECT_NO_DEMANGLE makes our default demangling
1107       // behaviour identical to that of gcc's linker wrapper.
1108       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1109     }
1110
1111   // -M is equivalent to "-Map -".
1112   if (this->print_map() && !this->user_set_Map())
1113     {
1114       this->set_Map("-");
1115       this->set_user_set_Map();
1116     }
1117
1118   // Using -n or -N implies -static.
1119   if (this->nmagic() || this->omagic())
1120     this->set_static(true);
1121
1122   // If --thread_count is specified, it applies to
1123   // --thread-count-{initial,middle,final}, though it doesn't override
1124   // them.
1125   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1126     this->set_thread_count_initial(this->thread_count());
1127   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1128     this->set_thread_count_middle(this->thread_count());
1129   if (this->thread_count() > 0 && this->thread_count_final() == 0)
1130     this->set_thread_count_final(this->thread_count());
1131
1132   // Let's warn if you set the thread-count but we're going to ignore it.
1133 #ifndef ENABLE_THREADS
1134   if (this->threads())
1135     {
1136       gold_warning(_("ignoring --threads: "
1137                      "%s was compiled without thread support"),
1138                    program_name);
1139       this->set_threads(false);
1140     }
1141   if (this->thread_count() > 0 || this->thread_count_initial() > 0
1142       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1143     gold_warning(_("ignoring --thread-count: "
1144                    "%s was compiled without thread support"),
1145                  program_name);
1146 #endif
1147
1148   std::string libpath;
1149   if (this->user_set_Y())
1150     {
1151       libpath = this->Y();
1152       if (libpath.compare(0, 2, "P,") == 0)
1153         libpath.erase(0, 2);
1154     }
1155   else if (!this->nostdlib())
1156     {
1157 #ifndef NATIVE_LINKER
1158 #define NATIVE_LINKER 0
1159 #endif
1160       const char* p = LIB_PATH;
1161       if (strcmp(p, "::DEFAULT::") != 0)
1162         libpath = p;
1163       else if (NATIVE_LINKER
1164                || this->user_set_sysroot()
1165                || *TARGET_SYSTEM_ROOT != '\0')
1166         {
1167           this->add_to_library_path_with_sysroot("/lib");
1168           this->add_to_library_path_with_sysroot("/usr/lib");
1169         }
1170       else
1171         this->add_to_library_path_with_sysroot(TOOLLIBDIR);
1172     }
1173
1174   if (!libpath.empty())
1175     {
1176       size_t pos = 0;
1177       size_t next_pos;
1178       do
1179         {
1180           next_pos = libpath.find(':', pos);
1181           size_t len = (next_pos == std::string::npos
1182                         ? next_pos
1183                         : next_pos - pos);
1184           if (len != 0)
1185             this->add_to_library_path_with_sysroot(libpath.substr(pos, len));
1186           pos = next_pos + 1;
1187         }
1188       while (next_pos != std::string::npos);
1189     }
1190
1191   // Parse the contents of -retain-symbols-file into a set.
1192   if (this->retain_symbols_file())
1193     {
1194       std::ifstream in;
1195       in.open(this->retain_symbols_file());
1196       if (!in)
1197         gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1198                    this->retain_symbols_file(), strerror(errno));
1199       std::string line;
1200       std::getline(in, line);   // this chops off the trailing \n, if any
1201       while (in)
1202         {
1203           if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1204             line.resize(line.length() - 1);
1205           this->symbols_to_retain_.insert(line);
1206           std::getline(in, line);
1207         }
1208     }
1209
1210   // -Bgroup implies --unresolved-symbols=report-all.
1211   if (this->Bgroup() && !this->user_set_unresolved_symbols())
1212     this->set_unresolved_symbols("report-all");
1213
1214   // -shared implies --allow-shlib-undefined.  Currently
1215   // ---allow-shlib-undefined controls warnings issued based on the
1216   // -symbol table.  --unresolved-symbols controls warnings issued
1217   // -based on relocations.
1218   if (this->shared() && !this->user_set_allow_shlib_undefined())
1219     this->set_allow_shlib_undefined(true);
1220
1221   // Normalize library_path() by adding the sysroot to all directories
1222   // in the path, as appropriate.
1223   this->add_sysroot();
1224
1225   // Now that we've normalized the options, check for contradictory ones.
1226   if (this->shared() && this->is_static())
1227     gold_fatal(_("-shared and -static are incompatible"));
1228   if (this->shared() && this->pie())
1229     gold_fatal(_("-shared and -pie are incompatible"));
1230   if (this->pie() && this->is_static())
1231     gold_fatal(_("-pie and -static are incompatible"));
1232
1233   if (this->shared() && this->relocatable())
1234     gold_fatal(_("-shared and -r are incompatible"));
1235   if (this->pie() && this->relocatable())
1236     gold_fatal(_("-pie and -r are incompatible"));
1237
1238   if (!this->shared())
1239     {
1240       if (this->filter() != NULL)
1241         gold_fatal(_("-F/--filter may not used without -shared"));
1242       if (this->any_auxiliary())
1243         gold_fatal(_("-f/--auxiliary may not be used without -shared"));
1244     }
1245
1246   // TODO: implement support for -retain-symbols-file with -r, if needed.
1247   if (this->relocatable() && this->retain_symbols_file())
1248     gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1249
1250   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1251       && (this->shared()
1252           || this->pie()
1253           || this->relocatable()))
1254     gold_fatal(_("binary output format not compatible "
1255                  "with -shared or -pie or -r"));
1256
1257   if (this->user_set_hash_bucket_empty_fraction()
1258       && (this->hash_bucket_empty_fraction() < 0.0
1259           || this->hash_bucket_empty_fraction() >= 1.0))
1260     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1261                  "[0.0, 1.0)"),
1262                this->hash_bucket_empty_fraction());
1263
1264   if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1265     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1266                  "--incremental-unknown require the use of --incremental"));
1267
1268   // Check for options that are not compatible with incremental linking.
1269   // Where an option can be disabled without seriously changing the semantics
1270   // of the link, we turn the option off; otherwise, we issue a fatal error.
1271
1272   if (this->incremental_mode_ != INCREMENTAL_OFF)
1273     {
1274       if (this->relocatable())
1275         gold_fatal(_("incremental linking is not compatible with -r"));
1276       if (this->emit_relocs())
1277         gold_fatal(_("incremental linking is not compatible with "
1278                      "--emit-relocs"));
1279       if (this->has_plugins())
1280         gold_fatal(_("incremental linking is not compatible with --plugin"));
1281       if (this->relro())
1282         gold_fatal(_("incremental linking is not compatible with -z relro"));
1283       if (this->gc_sections())
1284         {
1285           gold_warning(_("ignoring --gc-sections for an incremental link"));
1286           this->set_gc_sections(false);
1287         }
1288       if (this->icf_enabled())
1289         {
1290           gold_warning(_("ignoring --icf for an incremental link"));
1291           this->set_icf_status(ICF_NONE);
1292         }
1293       if (strcmp(this->compress_debug_sections(), "none") != 0)
1294         {
1295           gold_warning(_("ignoring --compress-debug-sections for an "
1296                          "incremental link"));
1297           this->set_compress_debug_sections("none");
1298         }
1299     }
1300
1301   // --rosegment-gap implies --rosegment.
1302   if (this->user_set_rosegment_gap())
1303     this->set_rosegment(true);
1304
1305   // FIXME: we can/should be doing a lot more sanity checking here.
1306 }
1307
1308 // Search_directory methods.
1309
1310 // This is called if we have a sysroot.  Apply the sysroot if
1311 // appropriate.  Record whether the directory is in the sysroot.
1312
1313 void
1314 Search_directory::add_sysroot(const char* sysroot,
1315                               const char* canonical_sysroot)
1316 {
1317   gold_assert(*sysroot != '\0');
1318   if (this->put_in_sysroot_)
1319     {
1320       if (!IS_DIR_SEPARATOR(this->name_[0])
1321           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1322         this->name_ = '/' + this->name_;
1323       this->name_ = sysroot + this->name_;
1324       this->is_in_sysroot_ = true;
1325     }
1326   else
1327     {
1328       // Check whether this entry is in the sysroot.  To do this
1329       // correctly, we need to use canonical names.  Otherwise we will
1330       // get confused by the ../../.. paths that gcc tends to use.
1331       char* canonical_name = lrealpath(this->name_.c_str());
1332       int canonical_name_len = strlen(canonical_name);
1333       int canonical_sysroot_len = strlen(canonical_sysroot);
1334       if (canonical_name_len > canonical_sysroot_len
1335           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1336         {
1337           canonical_name[canonical_sysroot_len] = '\0';
1338           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1339             this->is_in_sysroot_ = true;
1340         }
1341       free(canonical_name);
1342     }
1343 }
1344
1345 // Input_arguments methods.
1346
1347 // Add a file to the list.
1348
1349 Input_argument&
1350 Input_arguments::add_file(Input_file_argument& file)
1351 {
1352   file.set_arg_serial(++this->file_count_);
1353   if (this->in_group_)
1354     {
1355       gold_assert(!this->input_argument_list_.empty());
1356       gold_assert(this->input_argument_list_.back().is_group());
1357       return this->input_argument_list_.back().group()->add_file(file);
1358     }
1359   if (this->in_lib_)
1360     {
1361       gold_assert(!this->input_argument_list_.empty());
1362       gold_assert(this->input_argument_list_.back().is_lib());
1363       return this->input_argument_list_.back().lib()->add_file(file);
1364     }
1365   this->input_argument_list_.push_back(Input_argument(file));
1366   return this->input_argument_list_.back();
1367 }
1368
1369 // Start a group.
1370
1371 void
1372 Input_arguments::start_group()
1373 {
1374   if (this->in_group_)
1375     gold_fatal(_("May not nest groups"));
1376   if (this->in_lib_)
1377     gold_fatal(_("may not nest groups in libraries"));
1378   Input_file_group* group = new Input_file_group();
1379   this->input_argument_list_.push_back(Input_argument(group));
1380   this->in_group_ = true;
1381 }
1382
1383 // End a group.
1384
1385 void
1386 Input_arguments::end_group()
1387 {
1388   if (!this->in_group_)
1389     gold_fatal(_("Group end without group start"));
1390   this->in_group_ = false;
1391 }
1392
1393 // Start a lib.
1394
1395 void
1396 Input_arguments::start_lib(const Position_dependent_options& options)
1397 {
1398   if (this->in_lib_)
1399     gold_fatal(_("may not nest libraries"));
1400   if (this->in_group_)
1401     gold_fatal(_("may not nest libraries in groups"));
1402   Input_file_lib* lib = new Input_file_lib(options);
1403   this->input_argument_list_.push_back(Input_argument(lib));
1404   this->in_lib_ = true;
1405 }
1406
1407 // End a lib.
1408
1409 void
1410 Input_arguments::end_lib()
1411 {
1412   if (!this->in_lib_)
1413     gold_fatal(_("lib end without lib start"));
1414   this->in_lib_ = false;
1415 }
1416
1417 // Command_line options.
1418
1419 Command_line::Command_line()
1420 {
1421 }
1422
1423 // Pre_options is the hook that sets the ready_to_register flag.
1424
1425 Command_line::Pre_options::Pre_options()
1426 {
1427   gold::options::ready_to_register = true;
1428 }
1429
1430 // Process the command line options.  For process_one_option, i is the
1431 // index of argv to process next, and must be an option (that is,
1432 // start with a dash).  The return value is the index of the next
1433 // option to process (i+1 or i+2, or argc to indicate processing is
1434 // done).  no_more_options is set to true if (and when) "--" is seen
1435 // as an option.
1436
1437 int
1438 Command_line::process_one_option(int argc, const char** argv, int i,
1439                                  bool* no_more_options)
1440 {
1441   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1442
1443   // If we are reading "--", then just set no_more_options and return.
1444   if (argv[i][1] == '-' && argv[i][2] == '\0')
1445     {
1446       *no_more_options = true;
1447       return i + 1;
1448     }
1449
1450   int new_i = i;
1451   options::One_option* option = NULL;
1452   const char* arg = NULL;
1453
1454   // First, try to process argv as a long option.
1455   option = parse_long_option(argc, argv, false, &arg, &new_i);
1456   if (option)
1457     {
1458       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1459       return new_i;
1460     }
1461
1462   // Now, try to process argv as a short option.  Since several short
1463   // options can be combined in one argv, we may have to parse a lot
1464   // until we're done reading this argv.
1465   int pos_in_argv_i = 1;
1466   while (new_i == i)
1467     {
1468       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1469       if (!option)
1470         break;
1471       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1472       ++pos_in_argv_i;
1473     }
1474   if (option)
1475     return new_i;
1476
1477   // I guess it's neither a long option nor a short option.
1478   usage(_("unknown option"), argv[i]);
1479   return argc;
1480 }
1481
1482
1483 void
1484 Command_line::process(int argc, const char** argv)
1485 {
1486   bool no_more_options = false;
1487   int i = 0;
1488   while (i < argc)
1489     {
1490       this->position_options_.copy_from_options(this->options());
1491       if (no_more_options || argv[i][0] != '-')
1492         {
1493           Input_file_argument file(argv[i],
1494                                    Input_file_argument::INPUT_FILE_TYPE_FILE,
1495                                    "", false, this->position_options_);
1496           this->inputs_.add_file(file);
1497           ++i;
1498         }
1499       else
1500         i = process_one_option(argc, argv, i, &no_more_options);
1501     }
1502
1503   if (this->inputs_.in_group())
1504     {
1505       fprintf(stderr, _("%s: missing group end\n"), program_name);
1506       usage();
1507     }
1508
1509   // Normalize the options and ensure they don't contradict each other.
1510   this->options_.finalize();
1511 }
1512
1513 // Finalize the version script options and return them.
1514
1515 const Version_script_info&
1516 Command_line::version_script()
1517 {
1518   this->options_.finalize_dynamic_list();
1519   Version_script_info* vsi = this->script_options_.version_script_info();
1520   vsi->finalize();
1521   return *vsi;
1522 }
1523
1524 } // End namespace gold.