gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright (C) 2006-2019 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   printf("%s", gettext(this->helpstring));
 150   if (this->is_default)
 151     printf(" (%s)", _("default"));
 152   printf("\n");
 153 }
 154
 155 void
 156 help()
 157 {
 158   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 159
 160   std::vector<const One_option*>::const_iterator it;
 161   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 162     (*it)->print();
 163
 164   // config.guess and libtool.m4 look in ld --help output for the
 165   // string "supported targets".
 166   printf(_("%s: supported targets:"), gold::program_name);
 167   std::vector<const char*> supported_names;
 168   gold::supported_target_names(&supported_names);
 169   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 170        p != supported_names.end();
 171        ++p)
 172     printf(" %s", *p);
 173   printf("\n");
 174
 175   printf(_("%s: supported emulations:"), gold::program_name);
 176   supported_names.clear();
 177   gold::supported_emulation_names(&supported_names);
 178   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 179        p != supported_names.end();
 180        ++p)
 181     printf(" %s", *p);
 182   printf("\n");
 183
 184   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
 185   const char* report = REPORT_BUGS_TO;
 186   if (*report != '\0')
 187     printf(_("Report bugs to %s\n"), report);
 188 }
 189
 190 // For bool, arg will be NULL (boolean options take no argument);
 191 // we always just set to true.
 192 void
 193 parse_bool(const char*, const char*, bool* retval)
 194 {
 195   *retval = true;
 196 }
 197
 198 void
 199 parse_uint(const char* option_name, const char* arg, int* retval)
 200 {
 201   char* endptr;
 202   *retval = strtol(arg, &endptr, 0);
 203   if (*endptr != '\0' || *retval < 0)
 204     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 205                option_name, arg);
 206 }
 207
 208 void
 209 parse_int(const char* option_name, const char* arg, int* retval)
 210 {
 211   char* endptr;
 212   *retval = strtol(arg, &endptr, 0);
 213   if (*endptr != '\0')
 214     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 215                option_name, arg);
 216 }
 217
 218 void
 219 parse_uint64(const char* option_name, const char* arg, uint64_t* retval)
 220 {
 221   char* endptr;
 222   *retval = strtoull(arg, &endptr, 0);
 223   if (*endptr != '\0')
 224     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 225                option_name, arg);
 226 }
 227
 228 void
 229 parse_double(const char* option_name, const char* arg, double* retval)
 230 {
 231   char* endptr;
 232   *retval = strtod(arg, &endptr);
 233   if (*endptr != '\0')
 234     gold_fatal(_("%s: invalid option value "
 235                  "(expected a floating point number): %s"),
 236                option_name, arg);
 237 }
 238
 239 void
 240 parse_percent(const char* option_name, const char* arg, double* retval)
 241 {
 242   char* endptr;
 243   *retval = strtod(arg, &endptr) / 100.0;
 244   if (*endptr != '\0')
 245     gold_fatal(_("%s: invalid option value "
 246                  "(expected a floating point number): %s"),
 247                option_name, arg);
 248 }
 249
 250 void
 251 parse_string(const char* option_name, const char* arg, const char** retval)
 252 {
 253   if (*arg == '\0')
 254     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 255   *retval = arg;
 256 }
 257
 258 void
 259 parse_optional_string(const char*, const char* arg, const char** retval)
 260 {
 261   *retval = arg;
 262 }
 263
 264 void
 265 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 266 {
 267   retval->push_back(Search_directory(arg, false));
 268 }
 269
 270 void
 271 parse_set(const char*, const char* arg, String_set* retval)
 272 {
 273   retval->insert(std::string(arg));
 274 }
 275
 276 void
 277 parse_choices(const char* option_name, const char* arg, const char** retval,
 278               const char* choices[], int num_choices)
 279 {
 280   for (int i = 0; i < num_choices; i++)
 281     if (strcmp(choices[i], arg) == 0)
 282       {
 283         *retval = arg;
 284         return;
 285       }
 286
 287   // If we get here, the user did not enter a valid choice, so we die.
 288   std::string choices_list;
 289   for (int i = 0; i < num_choices; i++)
 290     {
 291       choices_list += choices[i];
 292       if (i != num_choices - 1)
 293         choices_list += ", ";
 294     }
 295   gold_fatal(_("%s: must take one of the following arguments: %s"),
 296              option_name, choices_list.c_str());
 297 }
 298
 299 } // End namespace options.
 300
 301 // Define the handler for "special" options (set via DEFINE_special).
 302
 303 void
 304 General_options::parse_help(const char*, const char*, Command_line*)
 305 {
 306   options::help();
 307   ::exit(EXIT_SUCCESS);
 308 }
 309
 310 void
 311 General_options::parse_version(const char* opt, const char*, Command_line*)
 312 {
 313   bool print_short = (opt[0] == '-' && opt[1] == 'v');
 314   gold::print_version(print_short);
 315   this->printed_version_ = true;
 316   if (!print_short)
 317     ::exit(EXIT_SUCCESS);
 318 }
 319
 320 void
 321 General_options::parse_V(const char*, const char*, Command_line*)
 322 {
 323   gold::print_version(true);
 324   this->printed_version_ = true;
 325
 326   printf(_("  Supported targets:\n"));
 327   std::vector<const char*> supported_names;
 328   gold::supported_target_names(&supported_names);
 329   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 330        p != supported_names.end();
 331        ++p)
 332     printf("   %s\n", *p);
 333
 334   printf(_("  Supported emulations:\n"));
 335   supported_names.clear();
 336   gold::supported_emulation_names(&supported_names);
 337   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 338        p != supported_names.end();
 339        ++p)
 340     printf("   %s\n", *p);
 341 }
 342
 343 void
 344 General_options::parse_defsym(const char*, const char* arg,
 345                               Command_line* cmdline)
 346 {
 347   cmdline->script_options().define_symbol(arg);
 348 }
 349
 350 void
 351 General_options::parse_discard_all(const char*, const char*,
 352                                    Command_line*)
 353 {
 354   this->discard_locals_ = DISCARD_ALL;
 355 }
 356
 357 void
 358 General_options::parse_discard_locals(const char*, const char*,
 359                                       Command_line*)
 360 {
 361   this->discard_locals_ = DISCARD_LOCALS;
 362 }
 363
 364 void
 365 General_options::parse_discard_none(const char*, const char*,
 366                                     Command_line*)
 367 {
 368   this->discard_locals_ = DISCARD_NONE;
 369 }
 370
 371 void
 372 General_options::parse_incremental(const char*, const char*,
 373                                    Command_line*)
 374 {
 375   this->incremental_mode_ = INCREMENTAL_AUTO;
 376 }
 377
 378 void
 379 General_options::parse_no_incremental(const char*, const char*,
 380                                       Command_line*)
 381 {
 382   this->incremental_mode_ = INCREMENTAL_OFF;
 383 }
 384
 385 void
 386 General_options::parse_incremental_full(const char*, const char*,
 387                                         Command_line*)
 388 {
 389   this->incremental_mode_ = INCREMENTAL_FULL;
 390 }
 391
 392 void
 393 General_options::parse_incremental_update(const char*, const char*,
 394                                           Command_line*)
 395 {
 396   this->incremental_mode_ = INCREMENTAL_UPDATE;
 397 }
 398
 399 void
 400 General_options::parse_incremental_changed(const char*, const char*,
 401                                            Command_line*)
 402 {
 403   this->implicit_incremental_ = true;
 404   this->incremental_disposition_ = INCREMENTAL_CHANGED;
 405 }
 406
 407 void
 408 General_options::parse_incremental_unchanged(const char*, const char*,
 409                                              Command_line*)
 410 {
 411   this->implicit_incremental_ = true;
 412   this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
 413 }
 414
 415 void
 416 General_options::parse_incremental_unknown(const char*, const char*,
 417                                            Command_line*)
 418 {
 419   this->implicit_incremental_ = true;
 420   this->incremental_disposition_ = INCREMENTAL_CHECK;
 421 }
 422
 423 void
 424 General_options::parse_incremental_startup_unchanged(const char*, const char*,
 425                                                      Command_line*)
 426 {
 427   this->implicit_incremental_ = true;
 428   this->incremental_startup_disposition_ = INCREMENTAL_UNCHANGED;
 429 }
 430
 431 void
 432 General_options::parse_library(const char*, const char* arg,
 433                                Command_line* cmdline)
 434 {
 435   Input_file_argument::Input_file_type type;
 436   const char* name;
 437   if (arg[0] == ':')
 438     {
 439       type = Input_file_argument::INPUT_FILE_TYPE_SEARCHED_FILE;
 440       name = arg + 1;
 441     }
 442   else
 443     {
 444       type = Input_file_argument::INPUT_FILE_TYPE_LIBRARY;
 445       name = arg;
 446     }
 447   Input_file_argument file(name, type, "", false, *this);
 448   cmdline->inputs().add_file(file);
 449 }
 450
 451 void
 452 General_options::parse_plugin(const char*, const char* arg,
 453                               Command_line*)
 454 {
 455   this->add_plugin(arg);
 456 }
 457
 458 // Parse --plugin-opt.
 459
 460 void
 461 General_options::parse_plugin_opt(const char*, const char* arg,
 462                                   Command_line*)
 463 {
 464   this->add_plugin_option(arg);
 465 }
 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 const char*
 691 General_options::object_format_to_string(General_options::Object_format fmt)
 692 {
 693   switch (fmt)
 694     {
 695     case General_options::OBJECT_FORMAT_ELF:
 696       return "elf";
 697     case General_options::OBJECT_FORMAT_BINARY:
 698       return "binary";
 699     default:
 700       gold_unreachable();
 701     }
 702 }
 703
 704 void
 705 General_options::parse_fix_v4bx(const char*, const char*,
 706                                 Command_line*)
 707 {
 708   this->fix_v4bx_ = FIX_V4BX_REPLACE;
 709 }
 710
 711 void
 712 General_options::parse_fix_v4bx_interworking(const char*, const char*,
 713                                              Command_line*)
 714 {
 715   this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
 716 }
 717
 718 void
 719 General_options::parse_EB(const char*, const char*, Command_line*)
 720 {
 721   this->endianness_ = ENDIANNESS_BIG;
 722 }
 723
 724 void
 725 General_options::parse_EL(const char*, const char*, Command_line*)
 726 {
 727   this->endianness_ = ENDIANNESS_LITTLE;
 728 }
 729
 730 void
 731 General_options::copy_from_posdep_options(
 732     const Position_dependent_options& posdep)
 733 {
 734   this->set_as_needed(posdep.as_needed());
 735   this->set_Bdynamic(posdep.Bdynamic());
 736   this->set_format(
 737       General_options::object_format_to_string(posdep.format_enum()));
 738   this->set_whole_archive(posdep.whole_archive());
 739   this->set_incremental_disposition(posdep.incremental_disposition());
 740 }
 741
 742 void
 743 General_options::parse_push_state(const char*, const char*, Command_line*)
 744 {
 745   Position_dependent_options* posdep = new Position_dependent_options(*this);
 746   this->options_stack_.push_back(posdep);
 747 }
 748
 749 void
 750 General_options::parse_pop_state(const char*, const char*, Command_line*)
 751 {
 752   if (this->options_stack_.empty())
 753     {
 754       gold::gold_error(_("unbalanced --push-state/--pop-state"));
 755       return;
 756     }
 757   Position_dependent_options* posdep = this->options_stack_.back();
 758   this->options_stack_.pop_back();
 759   this->copy_from_posdep_options(*posdep);
 760   delete posdep;
 761 }
 762
 763 } // End namespace gold.
 764
 765 namespace
 766 {
 767
 768 void
 769 usage()
 770 {
 771   fprintf(stderr,
 772           _("%s: use the --help option for usage information\n"),
 773           gold::program_name);
 774   ::exit(EXIT_FAILURE);
 775 }
 776
 777 void
 778 usage(const char* msg, const char* opt)
 779 {
 780   fprintf(stderr,
 781           _("%s: %s: %s\n"),
 782           gold::program_name, opt, msg);
 783   usage();
 784 }
 785
 786 // If the default sysroot is relocatable, try relocating it based on
 787 // the prefix FROM.
 788
 789 static char*
 790 get_relative_sysroot(const char* from)
 791 {
 792   char* path = make_relative_prefix(gold::program_name, from,
 793                                     TARGET_SYSTEM_ROOT);
 794   if (path != NULL)
 795     {
 796       struct stat s;
 797       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 798         return path;
 799       free(path);
 800     }
 801
 802   return NULL;
 803 }
 804
 805 // Return the default sysroot.  This is set by the --with-sysroot
 806 // option to configure.  Note we do not free the return value of
 807 // get_relative_sysroot, which is a small memory leak, but is
 808 // necessary since we store this pointer directly in General_options.
 809
 810 static const char*
 811 get_default_sysroot()
 812 {
 813   const char* sysroot = TARGET_SYSTEM_ROOT;
 814   if (*sysroot == '\0')
 815     return NULL;
 816
 817   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 818     {
 819       char* path = get_relative_sysroot(BINDIR);
 820       if (path == NULL)
 821         path = get_relative_sysroot(TOOLBINDIR);
 822       if (path != NULL)
 823         return path;
 824     }
 825
 826   return sysroot;
 827 }
 828
 829 // Parse a long option.  Such options have the form
 830 // <-|--><option>[=arg].  If "=arg" is not present but the option
 831 // takes an argument, the next word is taken to the be the argument.
 832 // If equals_only is set, then only the <option>=<arg> form is
 833 // accepted, not the <option><space><arg> form.  Returns a One_option
 834 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 835 // the not-NULL case, *arg is set to the option's argument (NULL if
 836 // the option takes no argument), and *i is advanced past this option.
 837 // NOTE: it is safe for argv and arg to point to the same place.
 838 gold::options::One_option*
 839 parse_long_option(int argc, const char** argv, bool equals_only,
 840                   const char** arg, int* i)
 841 {
 842   const char* const this_argv = argv[*i];
 843
 844   const char* equals = strchr(this_argv, '=');
 845   const char* option_start = this_argv + strspn(this_argv, "-");
 846   std::string option(option_start,
 847                      equals ? equals - option_start : strlen(option_start));
 848
 849   gold::options::Option_map::iterator it
 850       = gold::options::long_options->find(option);
 851   if (it == gold::options::long_options->end())
 852     return NULL;
 853
 854   gold::options::One_option* retval = it->second;
 855
 856   // If the dash-count doesn't match, we fail.
 857   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 858     {
 859       if (retval->dashes != gold::options::DASH_Z)
 860         return NULL;
 861     }
 862   else if (this_argv[1] != '-')   // one dash
 863     {
 864       if (retval->dashes != gold::options::ONE_DASH
 865           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 866           && retval->dashes != gold::options::TWO_DASHES)
 867         return NULL;
 868     }
 869   else                            // two dashes (or more!)
 870     {
 871       if (retval->dashes != gold::options::TWO_DASHES
 872           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 873           && retval->dashes != gold::options::ONE_DASH)
 874         return NULL;
 875     }
 876
 877   // Now that we know the option is good (or else bad in a way that
 878   // will cause us to die), increment i to point past this argv.
 879   ++(*i);
 880
 881   // Figure out the option's argument, if any.
 882   if (!retval->takes_argument())
 883     {
 884       if (equals)
 885         usage(_("unexpected argument"), this_argv);
 886       else
 887         *arg = NULL;
 888     }
 889   else
 890     {
 891       if (equals)
 892         *arg = equals + 1;
 893       else if (retval->takes_optional_argument())
 894         *arg = retval->default_value;
 895       else if (*i < argc && !equals_only)
 896         *arg = argv[(*i)++];
 897       else
 898         usage(_("missing argument"), this_argv);
 899     }
 900
 901   return retval;
 902 }
 903
 904 // Parse a short option.  Such options have the form -<option>[arg].
 905 // If "arg" is not present but the option takes an argument, the next
 906 // word is taken to the be the argument.  If the option does not take
 907 // an argument, it may be followed by another short option.  Returns a
 908 // One_option struct or NULL if argv[i] cannot be parsed as a short
 909 // option.  In the not-NULL case, *arg is set to the option's argument
 910 // (NULL if the option takes no argument), and *i is advanced past
 911 // this option.  This function keeps *i the same if we parsed a short
 912 // option that does not take an argument, that looks to be followed by
 913 // another short option in the same word.
 914 gold::options::One_option*
 915 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 916                    const char** arg, int* i)
 917 {
 918   const char* const this_argv = argv[*i];
 919
 920   if (this_argv[0] != '-')
 921     return NULL;
 922
 923   // We handle -z as a special case.
 924   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 925                                           'z', "", NULL, "Z-OPTION", false,
 926                                           NULL, false);
 927   gold::options::One_option* retval = NULL;
 928   if (this_argv[pos_in_argv_i] == 'z')
 929     retval = &dash_z;
 930   else
 931     {
 932       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 933       if (char_as_int > 0 && char_as_int < 128)
 934         retval = gold::options::short_options[char_as_int];
 935     }
 936
 937   if (retval == NULL)
 938     return NULL;
 939
 940   // Figure out the option's argument, if any.
 941   if (!retval->takes_argument())
 942     {
 943       *arg = NULL;
 944       // We only advance past this argument if it's the only one in argv.
 945       if (this_argv[pos_in_argv_i + 1] == '\0')
 946         ++(*i);
 947     }
 948   else
 949     {
 950       // If we take an argument, we'll eat up this entire argv entry.
 951       ++(*i);
 952       if (this_argv[pos_in_argv_i + 1] != '\0')
 953         *arg = this_argv + pos_in_argv_i + 1;
 954       else if (retval->takes_optional_argument())
 955         *arg = retval->default_value;
 956       else if (*i < argc)
 957         *arg = argv[(*i)++];
 958       else
 959         usage(_("missing argument"), this_argv);
 960     }
 961
 962   // If we're a -z option, we need to parse our argument as a
 963   // long-option, e.g. "-z stacksize=8192".
 964   if (retval == &dash_z)
 965     {
 966       int dummy_i = 0;
 967       const char* dash_z_arg = *arg;
 968       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 969       if (retval == NULL)
 970         usage(_("unknown -z option"), dash_z_arg);
 971     }
 972
 973   return retval;
 974 }
 975
 976 } // End anonymous namespace.
 977
 978 namespace gold
 979 {
 980
 981 General_options::General_options()
 982   : printed_version_(false),
 983     execstack_status_(EXECSTACK_FROM_INPUT),
 984     icf_status_(ICF_NONE),
 985     static_(false),
 986     do_demangle_(false),
 987     plugins_(NULL),
 988     dynamic_list_(),
 989     have_dynamic_list_(false),
 990     incremental_mode_(INCREMENTAL_OFF),
 991     incremental_disposition_(INCREMENTAL_STARTUP),
 992     incremental_startup_disposition_(INCREMENTAL_CHECK),
 993     implicit_incremental_(false),
 994     excluded_libs_(),
 995     symbols_to_retain_(),
 996     section_starts_(),
 997     fix_v4bx_(FIX_V4BX_NONE),
 998     endianness_(ENDIANNESS_NOT_SET),
 999     discard_locals_(DISCARD_SEC_MERGE),
1000     orphan_handling_enum_(ORPHAN_PLACE)
1001 {
1002   // Turn off option registration once construction is complete.
1003   gold::options::ready_to_register = false;
1004 }
1005
1006 General_options::Object_format
1007 General_options::format_enum() const
1008 {
1009   return General_options::string_to_object_format(this->format());
1010 }
1011
1012 General_options::Object_format
1013 General_options::oformat_enum() const
1014 {
1015   return General_options::string_to_object_format(this->oformat());
1016 }
1017
1018 // Add the sysroot, if any, to the search paths.
1019
1020 void
1021 General_options::add_sysroot()
1022 {
1023   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1024     {
1025       this->set_sysroot(get_default_sysroot());
1026       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1027         return;
1028     }
1029
1030   char* canonical_sysroot = lrealpath(this->sysroot());
1031
1032   for (Dir_list::iterator p = this->library_path_.value.begin();
1033        p != this->library_path_.value.end();
1034        ++p)
1035     p->add_sysroot(this->sysroot(), canonical_sysroot);
1036
1037   free(canonical_sysroot);
1038 }
1039
1040 // Return whether FILENAME is in a system directory.
1041
1042 bool
1043 General_options::is_in_system_directory(const std::string& filename) const
1044 {
1045   for (Dir_list::const_iterator p = this->library_path_.value.begin();
1046        p != this->library_path_.value.end();
1047        ++p)
1048     {
1049       // We use a straight string comparison rather than calling
1050       // FILENAME_CMP because we are only interested in the cases
1051       // where we found the file in a system directory, which means
1052       // that we used the directory name as a prefix for a -L search.
1053       if (p->is_system_directory()
1054           && filename.compare(0, p->name().size(), p->name()) == 0)
1055         return true;
1056     }
1057   return false;
1058 }
1059
1060 // Add a plugin to the list of plugins.
1061
1062 void
1063 General_options::add_plugin(const char* filename)
1064 {
1065   if (this->plugins_ == NULL)
1066     this->plugins_ = new Plugin_manager(*this);
1067   this->plugins_->add_plugin(filename);
1068 }
1069
1070 // Add a plugin option to a plugin.
1071
1072 void
1073 General_options::add_plugin_option(const char* arg)
1074 {
1075   if (this->plugins_ == NULL)
1076     gold_fatal("--plugin-opt requires --plugin.");
1077   this->plugins_->add_plugin_option(arg);
1078 }
1079
1080 // Set up variables and other state that isn't set up automatically by
1081 // the parse routine, and ensure options don't contradict each other
1082 // and are otherwise kosher.
1083
1084 void
1085 General_options::finalize()
1086 {
1087   // Normalize the strip modifiers.  They have a total order:
1088   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
1089   // If one is true, set all beneath it to true as well.
1090   if (this->strip_all())
1091     this->set_strip_debug(true);
1092   if (this->strip_debug())
1093     this->set_strip_debug_non_line(true);
1094   if (this->strip_debug_non_line())
1095     this->set_strip_debug_gdb(true);
1096
1097   if (this->Bshareable())
1098     this->set_shared(true);
1099
1100   // If the user specifies both -s and -r, convert the -s to -S.
1101   // -r requires us to keep externally visible symbols!
1102   if (this->strip_all() && this->relocatable())
1103     {
1104       this->set_strip_all(false);
1105       gold_assert(this->strip_debug());
1106     }
1107
1108   // For us, -dc and -dp are synonyms for --define-common.
1109   if (this->dc())
1110     this->set_define_common(true);
1111   if (this->dp())
1112     this->set_define_common(true);
1113
1114   // We also set --define-common if we're not relocatable, as long as
1115   // the user didn't explicitly ask for something different.
1116   if (!this->user_set_define_common())
1117     this->set_define_common(!this->relocatable());
1118
1119   // execstack_status_ is a three-state variable; update it based on
1120   // -z [no]execstack.
1121   if (this->execstack())
1122     this->set_execstack_status(EXECSTACK_YES);
1123   else if (this->noexecstack())
1124     this->set_execstack_status(EXECSTACK_NO);
1125
1126   // icf_status_ is a three-state variable; update it based on the
1127   // value of this->icf().
1128   if (strcmp(this->icf(), "none") == 0)
1129     this->set_icf_status(ICF_NONE);
1130   else if (strcmp(this->icf(), "safe") == 0)
1131     this->set_icf_status(ICF_SAFE);
1132   else
1133     this->set_icf_status(ICF_ALL);
1134
1135   // Handle the optional argument for --demangle.
1136   if (this->user_set_demangle())
1137     {
1138       this->set_do_demangle(true);
1139       const char* style = this->demangle();
1140       if (*style != '\0')
1141         {
1142           enum demangling_styles style_code;
1143
1144           style_code = cplus_demangle_name_to_style(style);
1145           if (style_code == unknown_demangling)
1146             gold_fatal("unknown demangling style '%s'", style);
1147           cplus_demangle_set_style(style_code);
1148         }
1149     }
1150   else if (this->user_set_no_demangle())
1151     this->set_do_demangle(false);
1152   else
1153     {
1154       // Testing COLLECT_NO_DEMANGLE makes our default demangling
1155       // behaviour identical to that of gcc's linker wrapper.
1156       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1157     }
1158
1159   // Parse the --orphan-handling argument.
1160   if (this->user_set_orphan_handling())
1161     {
1162       if (strcmp(this->orphan_handling(), "place") == 0)
1163         this->set_orphan_handling_enum(ORPHAN_PLACE);
1164       else if (strcmp(this->orphan_handling(), "discard") == 0)
1165         this->set_orphan_handling_enum(ORPHAN_DISCARD);
1166       else if (strcmp(this->orphan_handling(), "warn") == 0)
1167         this->set_orphan_handling_enum(ORPHAN_WARN);
1168       else if (strcmp(this->orphan_handling(), "error") == 0)
1169         this->set_orphan_handling_enum(ORPHAN_ERROR);
1170     }
1171
1172   // -M is equivalent to "-Map -".
1173   if (this->print_map() && !this->user_set_Map())
1174     {
1175       this->set_Map("-");
1176       this->set_user_set_Map();
1177     }
1178
1179   // Using -n or -N implies -static.
1180   if (this->nmagic() || this->omagic())
1181     this->set_static(true);
1182
1183   // If --thread_count is specified, it applies to
1184   // --thread-count-{initial,middle,final}, though it doesn't override
1185   // them.
1186   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1187     this->set_thread_count_initial(this->thread_count());
1188   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1189     this->set_thread_count_middle(this->thread_count());
1190   if (this->thread_count() > 0 && this->thread_count_final() == 0)
1191     this->set_thread_count_final(this->thread_count());
1192
1193   // Let's warn if you set the thread-count but we're going to ignore it.
1194 #ifndef ENABLE_THREADS
1195   if (this->threads())
1196     {
1197       gold_warning(_("ignoring --threads: "
1198                      "%s was compiled without thread support"),
1199                    program_name);
1200       this->set_threads(false);
1201     }
1202   if (this->thread_count() > 0 || this->thread_count_initial() > 0
1203       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1204     gold_warning(_("ignoring --thread-count: "
1205                    "%s was compiled without thread support"),
1206                  program_name);
1207 #endif
1208
1209 #ifndef ENABLE_PLUGINS
1210   if (this->has_plugins())
1211     gold_fatal(_("cannot use --plugin: "
1212                  "%s was compiled without plugin support"),
1213                program_name);
1214 #endif
1215
1216   std::string libpath;
1217   if (this->user_set_Y())
1218     {
1219       libpath = this->Y();
1220       if (libpath.compare(0, 2, "P,") == 0)
1221         libpath.erase(0, 2);
1222     }
1223   else if (!this->nostdlib())
1224     {
1225 #ifndef NATIVE_LINKER
1226 #define NATIVE_LINKER 0
1227 #endif
1228       const char* p = LIB_PATH;
1229       if (strcmp(p, "::DEFAULT::") != 0)
1230         libpath = p;
1231       else if (NATIVE_LINKER
1232                || this->user_set_sysroot()
1233                || *TARGET_SYSTEM_ROOT != '\0')
1234         {
1235           this->add_to_library_path_with_sysroot("/lib");
1236           this->add_to_library_path_with_sysroot("/usr/lib");
1237         }
1238       else
1239         this->add_to_library_path_with_sysroot(TOOLLIBDIR);
1240     }
1241
1242   if (!libpath.empty())
1243     {
1244       size_t pos = 0;
1245       size_t next_pos;
1246       do
1247         {
1248           next_pos = libpath.find(':', pos);
1249           size_t len = (next_pos == std::string::npos
1250                         ? next_pos
1251                         : next_pos - pos);
1252           if (len != 0)
1253             this->add_to_library_path_with_sysroot(libpath.substr(pos, len));
1254           pos = next_pos + 1;
1255         }
1256       while (next_pos != std::string::npos);
1257     }
1258
1259   // Parse the contents of -retain-symbols-file into a set.
1260   if (this->retain_symbols_file())
1261     {
1262       std::ifstream in;
1263       in.open(this->retain_symbols_file());
1264       if (!in)
1265         gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1266                    this->retain_symbols_file(), strerror(errno));
1267       std::string line;
1268       std::getline(in, line);   // this chops off the trailing \n, if any
1269       while (in)
1270         {
1271           if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1272             line.resize(line.length() - 1);
1273           this->symbols_to_retain_.insert(line);
1274           std::getline(in, line);
1275         }
1276     }
1277
1278   // -Bgroup implies --unresolved-symbols=report-all.
1279   if (this->Bgroup() && !this->user_set_unresolved_symbols())
1280     this->set_unresolved_symbols("report-all");
1281
1282   // -shared implies --allow-shlib-undefined.  Currently
1283   // ---allow-shlib-undefined controls warnings issued based on the
1284   // -symbol table.  --unresolved-symbols controls warnings issued
1285   // -based on relocations.
1286   if (this->shared() && !this->user_set_allow_shlib_undefined())
1287     this->set_allow_shlib_undefined(true);
1288
1289   // Normalize library_path() by adding the sysroot to all directories
1290   // in the path, as appropriate.
1291   this->add_sysroot();
1292
1293   // Now that we've normalized the options, check for contradictory ones.
1294   if (this->shared() && this->is_static())
1295     gold_fatal(_("-shared and -static are incompatible"));
1296   if (this->shared() && this->pie())
1297     gold_fatal(_("-shared and -pie are incompatible"));
1298   if (this->pie() && this->is_static())
1299     gold_fatal(_("-pie and -static are incompatible"));
1300
1301   if (this->shared() && this->relocatable())
1302     gold_fatal(_("-shared and -r are incompatible"));
1303   if (this->pie() && this->relocatable())
1304     gold_fatal(_("-pie and -r are incompatible"));
1305
1306   if (!this->shared())
1307     {
1308       if (this->filter() != NULL)
1309         gold_fatal(_("-F/--filter may not used without -shared"));
1310       if (this->any_auxiliary())
1311         gold_fatal(_("-f/--auxiliary may not be used without -shared"));
1312     }
1313
1314   // TODO: implement support for -retain-symbols-file with -r, if needed.
1315   if (this->relocatable() && this->retain_symbols_file())
1316     gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1317
1318   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1319       && (this->shared()
1320           || this->pie()
1321           || this->relocatable()))
1322     gold_fatal(_("binary output format not compatible "
1323                  "with -shared or -pie or -r"));
1324
1325   if (this->user_set_hash_bucket_empty_fraction()
1326       && (this->hash_bucket_empty_fraction() < 0.0
1327           || this->hash_bucket_empty_fraction() >= 1.0))
1328     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1329                  "[0.0, 1.0)"),
1330                this->hash_bucket_empty_fraction());
1331
1332   if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1333     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1334                  "--incremental-unknown require the use of --incremental"));
1335
1336   // Check for options that are not compatible with incremental linking.
1337   // Where an option can be disabled without seriously changing the semantics
1338   // of the link, we turn the option off; otherwise, we issue a fatal error.
1339
1340   if (this->incremental_mode_ != INCREMENTAL_OFF)
1341     {
1342       if (this->relocatable())
1343         gold_fatal(_("incremental linking is not compatible with -r"));
1344       if (this->emit_relocs())
1345         gold_fatal(_("incremental linking is not compatible with "
1346                      "--emit-relocs"));
1347       if (this->has_plugins())
1348         gold_fatal(_("incremental linking is not compatible with --plugin"));
1349       if (this->relro())
1350         gold_fatal(_("incremental linking is not compatible with -z relro"));
1351       if (this->pie())
1352         gold_fatal(_("incremental linking is not compatible with -pie"));
1353       if (this->gc_sections())
1354         {
1355           gold_warning(_("ignoring --gc-sections for an incremental link"));
1356           this->set_gc_sections(false);
1357         }
1358       if (this->icf_enabled())
1359         {
1360           gold_warning(_("ignoring --icf for an incremental link"));
1361           this->set_icf_status(ICF_NONE);
1362         }
1363       if (strcmp(this->compress_debug_sections(), "none") != 0)
1364         {
1365           gold_warning(_("ignoring --compress-debug-sections for an "
1366                          "incremental link"));
1367           this->set_compress_debug_sections("none");
1368         }
1369     }
1370
1371   // --rosegment-gap implies --rosegment.
1372   if (this->user_set_rosegment_gap())
1373     this->set_rosegment(true);
1374
1375   // FIXME: we can/should be doing a lot more sanity checking here.
1376 }
1377
1378 // Search_directory methods.
1379
1380 // This is called if we have a sysroot.  Apply the sysroot if
1381 // appropriate.  Record whether the directory is in the sysroot.
1382
1383 void
1384 Search_directory::add_sysroot(const char* sysroot,
1385                               const char* canonical_sysroot)
1386 {
1387   gold_assert(*sysroot != '\0');
1388   if (this->put_in_sysroot_)
1389     {
1390       if (!IS_DIR_SEPARATOR(this->name_[0])
1391           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1392         this->name_ = '/' + this->name_;
1393       this->name_ = sysroot + this->name_;
1394       this->is_in_sysroot_ = true;
1395     }
1396   else
1397     {
1398       // Check whether this entry is in the sysroot.  To do this
1399       // correctly, we need to use canonical names.  Otherwise we will
1400       // get confused by the ../../.. paths that gcc tends to use.
1401       char* canonical_name = lrealpath(this->name_.c_str());
1402       int canonical_name_len = strlen(canonical_name);
1403       int canonical_sysroot_len = strlen(canonical_sysroot);
1404       if (canonical_name_len > canonical_sysroot_len
1405           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1406         {
1407           canonical_name[canonical_sysroot_len] = '\0';
1408           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1409             this->is_in_sysroot_ = true;
1410         }
1411       free(canonical_name);
1412     }
1413 }
1414
1415 // Input_arguments methods.
1416
1417 // Add a file to the list.
1418
1419 Input_argument&
1420 Input_arguments::add_file(Input_file_argument& file)
1421 {
1422   file.set_arg_serial(++this->file_count_);
1423   if (this->in_group_)
1424     {
1425       gold_assert(!this->input_argument_list_.empty());
1426       gold_assert(this->input_argument_list_.back().is_group());
1427       return this->input_argument_list_.back().group()->add_file(file);
1428     }
1429   if (this->in_lib_)
1430     {
1431       gold_assert(!this->input_argument_list_.empty());
1432       gold_assert(this->input_argument_list_.back().is_lib());
1433       return this->input_argument_list_.back().lib()->add_file(file);
1434     }
1435   this->input_argument_list_.push_back(Input_argument(file));
1436   return this->input_argument_list_.back();
1437 }
1438
1439 // Start a group.
1440
1441 void
1442 Input_arguments::start_group()
1443 {
1444   if (this->in_group_)
1445     gold_fatal(_("May not nest groups"));
1446   if (this->in_lib_)
1447     gold_fatal(_("may not nest groups in libraries"));
1448   Input_file_group* group = new Input_file_group();
1449   this->input_argument_list_.push_back(Input_argument(group));
1450   this->in_group_ = true;
1451 }
1452
1453 // End a group.
1454
1455 void
1456 Input_arguments::end_group()
1457 {
1458   if (!this->in_group_)
1459     gold_fatal(_("Group end without group start"));
1460   this->in_group_ = false;
1461 }
1462
1463 // Start a lib.
1464
1465 void
1466 Input_arguments::start_lib(const Position_dependent_options& options)
1467 {
1468   if (this->in_lib_)
1469     gold_fatal(_("may not nest libraries"));
1470   if (this->in_group_)
1471     gold_fatal(_("may not nest libraries in groups"));
1472   Input_file_lib* lib = new Input_file_lib(options);
1473   this->input_argument_list_.push_back(Input_argument(lib));
1474   this->in_lib_ = true;
1475 }
1476
1477 // End a lib.
1478
1479 void
1480 Input_arguments::end_lib()
1481 {
1482   if (!this->in_lib_)
1483     gold_fatal(_("lib end without lib start"));
1484   this->in_lib_ = false;
1485 }
1486
1487 // Command_line options.
1488
1489 Command_line::Command_line()
1490 {
1491 }
1492
1493 // Pre_options is the hook that sets the ready_to_register flag.
1494
1495 Command_line::Pre_options::Pre_options()
1496 {
1497   gold::options::ready_to_register = true;
1498 }
1499
1500 // Process the command line options.  For process_one_option, i is the
1501 // index of argv to process next, and must be an option (that is,
1502 // start with a dash).  The return value is the index of the next
1503 // option to process (i+1 or i+2, or argc to indicate processing is
1504 // done).  no_more_options is set to true if (and when) "--" is seen
1505 // as an option.
1506
1507 int
1508 Command_line::process_one_option(int argc, const char** argv, int i,
1509                                  bool* no_more_options)
1510 {
1511   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1512
1513   // If we are reading "--", then just set no_more_options and return.
1514   if (argv[i][1] == '-' && argv[i][2] == '\0')
1515     {
1516       *no_more_options = true;
1517       return i + 1;
1518     }
1519
1520   int new_i = i;
1521   options::One_option* option = NULL;
1522   const char* arg = NULL;
1523
1524   // First, try to process argv as a long option.
1525   option = parse_long_option(argc, argv, false, &arg, &new_i);
1526   if (option)
1527     {
1528       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1529       return new_i;
1530     }
1531
1532   // Now, try to process argv as a short option.  Since several short
1533   // options can be combined in one argv, we may have to parse a lot
1534   // until we're done reading this argv.
1535   int pos_in_argv_i = 1;
1536   while (new_i == i)
1537     {
1538       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1539       if (!option)
1540         break;
1541       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1542       ++pos_in_argv_i;
1543     }
1544   if (option)
1545     return new_i;
1546
1547   // I guess it's neither a long option nor a short option.
1548   usage(_("unknown option"), argv[i]);
1549   return argc;
1550 }
1551
1552
1553 void
1554 Command_line::process(int argc, const char** argv)
1555 {
1556   bool no_more_options = false;
1557   int i = 0;
1558   while (i < argc)
1559     {
1560       this->position_options_.copy_from_options(this->options());
1561       if (no_more_options || argv[i][0] != '-')
1562         {
1563           Input_file_argument file(argv[i],
1564                                    Input_file_argument::INPUT_FILE_TYPE_FILE,
1565                                    "", false, this->position_options_);
1566           this->inputs_.add_file(file);
1567           ++i;
1568         }
1569       else
1570         i = process_one_option(argc, argv, i, &no_more_options);
1571     }
1572
1573   if (this->inputs_.in_group())
1574     {
1575       fprintf(stderr, _("%s: missing group end\n"), program_name);
1576       usage();
1577     }
1578
1579   if (this->inputs_.in_lib())
1580     {
1581       fprintf(stderr, _("%s: missing lib end\n"), program_name);
1582       usage();
1583     }
1584
1585   // Normalize the options and ensure they don't contradict each other.
1586   this->options_.finalize();
1587 }
1588
1589 // Finalize the version script options and return them.
1590
1591 const Version_script_info&
1592 Command_line::version_script()
1593 {
1594   this->options_.finalize_dynamic_list();
1595   Version_script_info* vsi = this->script_options_.version_script_info();
1596   vsi->finalize();
1597   return *vsi;
1598 }
1599
1600 } // End namespace gold.