gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright (C) 2006-2020 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_no_power10_stubs(const char*, const char*,
 469                                         Command_line*)
 470 {
 471   this->set_power10_stubs("no");
 472   this->set_user_set_power10_stubs();
 473 }
 474
 475 void
 476 General_options::parse_R(const char* option, const char* arg,
 477                          Command_line* cmdline)
 478 {
 479   struct stat s;
 480   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 481     this->add_to_rpath(arg);
 482   else
 483     this->parse_just_symbols(option, arg, cmdline);
 484 }
 485
 486 void
 487 General_options::parse_just_symbols(const char*, const char* arg,
 488                                     Command_line* cmdline)
 489 {
 490   Input_file_argument file(arg, Input_file_argument::INPUT_FILE_TYPE_FILE,
 491                            "", true, *this);
 492   cmdline->inputs().add_file(file);
 493 }
 494
 495 // Handle --section-start.
 496
 497 void
 498 General_options::parse_section_start(const char*, const char* arg,
 499                                      Command_line*)
 500 {
 501   const char* eq = strchr(arg, '=');
 502   if (eq == NULL)
 503     {
 504       gold_error(_("invalid argument to --section-start; "
 505                    "must be SECTION=ADDRESS"));
 506       return;
 507     }
 508
 509   std::string section_name(arg, eq - arg);
 510
 511   ++eq;
 512   const char* val_start = eq;
 513   if (eq[0] == '0' && (eq[1] == 'x' || eq[1] == 'X'))
 514     eq += 2;
 515   if (*eq == '\0')
 516     {
 517       gold_error(_("--section-start address missing"));
 518       return;
 519     }
 520   uint64_t addr = 0;
 521   hex_init();
 522   for (; *eq != '\0'; ++eq)
 523     {
 524       if (!hex_p(*eq))
 525         {
 526           gold_error(_("--section-start argument %s is not a valid hex number"),
 527                      val_start);
 528           return;
 529         }
 530       addr <<= 4;
 531       addr += hex_value(*eq);
 532     }
 533
 534   this->section_starts_[section_name] = addr;
 535 }
 536
 537 // Look up a --section-start value.
 538
 539 bool
 540 General_options::section_start(const char* secname, uint64_t* paddr) const
 541 {
 542   if (this->section_starts_.empty())
 543     return false;
 544   std::map<std::string, uint64_t>::const_iterator p =
 545     this->section_starts_.find(secname);
 546   if (p == this->section_starts_.end())
 547     return false;
 548   *paddr = p->second;
 549   return true;
 550 }
 551
 552 void
 553 General_options::parse_static(const char*, const char*, Command_line*)
 554 {
 555   this->set_static(true);
 556 }
 557
 558 void
 559 General_options::parse_script(const char*, const char* arg,
 560                               Command_line* cmdline)
 561 {
 562   if (!read_commandline_script(arg, cmdline))
 563     gold::gold_fatal(_("unable to parse script file %s"), arg);
 564 }
 565
 566 void
 567 General_options::parse_version_script(const char*, const char* arg,
 568                                       Command_line* cmdline)
 569 {
 570   if (!read_version_script(arg, cmdline))
 571     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 572 }
 573
 574 void
 575 General_options::parse_dynamic_list(const char*, const char* arg,
 576                                     Command_line* cmdline)
 577 {
 578   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 579     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 580   this->have_dynamic_list_ = true;
 581 }
 582
 583 void
 584 General_options::parse_start_group(const char*, const char*,
 585                                    Command_line* cmdline)
 586 {
 587   cmdline->inputs().start_group();
 588 }
 589
 590 void
 591 General_options::parse_end_group(const char*, const char*,
 592                                  Command_line* cmdline)
 593 {
 594   cmdline->inputs().end_group();
 595 }
 596
 597 void
 598 General_options::parse_start_lib(const char*, const char*,
 599                                  Command_line* cmdline)
 600 {
 601   cmdline->inputs().start_lib(cmdline->position_dependent_options());
 602 }
 603
 604 void
 605 General_options::parse_end_lib(const char*, const char*,
 606                                Command_line* cmdline)
 607 {
 608   cmdline->inputs().end_lib();
 609 }
 610
 611 // The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
 612 // of names separated by commas or colons and puts them in a linked list.
 613 // We implement the same parsing of names here but store names in an unordered
 614 // map to speed up searching of names.
 615
 616 void
 617 General_options::parse_exclude_libs(const char*, const char* arg,
 618                                     Command_line*)
 619 {
 620   const char* p = arg;
 621
 622   while (*p != '\0')
 623     {
 624       size_t length = strcspn(p, ",:");
 625       this->excluded_libs_.insert(std::string(p, length));
 626       p += (p[length] ? length + 1 : length);
 627     }
 628 }
 629
 630 // The checking logic is based on the function check_excluded_libs() in
 631 // ld/ldlang.c of GNU ld but our implementation is different because we use
 632 // an unordered map instead of a linked list, which is what GNU ld uses.  GNU
 633 // ld searches sequentially in the excluded libs list.  For a given archive,
 634 // a match is found if the archive's name matches exactly one of the list
 635 // entry or if the archive's name is of the form FOO.a and FOO matches exactly
 636 // one of the list entry.  An entry "ALL" in the list is considered as a
 637 // wild-card and matches any given name.
 638
 639 bool
 640 General_options::check_excluded_libs(const std::string &name) const
 641 {
 642   Unordered_set<std::string>::const_iterator p;
 643
 644   // Exit early for the most common case.
 645   if (excluded_libs_.empty())
 646     return false;
 647
 648   // If we see "ALL", all archives are excluded from automatic export.
 649   p = excluded_libs_.find(std::string("ALL"));
 650   if (p != excluded_libs_.end())
 651     return true;
 652
 653   // First strip off any directories in name.
 654   const char* basename = lbasename(name.c_str());
 655
 656   // Try finding an exact match.
 657   p = excluded_libs_.find(std::string(basename));
 658   if (p != excluded_libs_.end())
 659     return true;
 660
 661   // Try matching NAME without ".a" at the end.
 662   size_t length = strlen(basename);
 663   if ((length >= 2)
 664       && (basename[length - 2] == '.')
 665       && (basename[length - 1] == 'a'))
 666     {
 667       p = excluded_libs_.find(std::string(basename, length - 2));
 668       if (p != excluded_libs_.end())
 669         return true;
 670     }
 671
 672   return false;
 673 }
 674
 675 // Recognize input and output target names.  The GNU linker accepts
 676 // these with --format and --oformat.  This code is intended to be
 677 // minimally compatible.  In practice for an ELF target this would be
 678 // the same target as the input files; that name always start with
 679 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 680 // "binary", "ihex".
 681
 682 General_options::Object_format
 683 General_options::string_to_object_format(const char* arg)
 684 {
 685   if (strncmp(arg, "elf", 3) == 0 || strcmp(arg, "default") == 0)
 686     return gold::General_options::OBJECT_FORMAT_ELF;
 687   else if (strcmp(arg, "binary") == 0)
 688     return gold::General_options::OBJECT_FORMAT_BINARY;
 689   else
 690     {
 691       gold::gold_error(_("format '%s' not supported; treating as elf "
 692                          "(supported formats: elf, binary)"),
 693                        arg);
 694       return gold::General_options::OBJECT_FORMAT_ELF;
 695     }
 696 }
 697
 698 const char*
 699 General_options::object_format_to_string(General_options::Object_format fmt)
 700 {
 701   switch (fmt)
 702     {
 703     case General_options::OBJECT_FORMAT_ELF:
 704       return "elf";
 705     case General_options::OBJECT_FORMAT_BINARY:
 706       return "binary";
 707     default:
 708       gold_unreachable();
 709     }
 710 }
 711
 712 void
 713 General_options::parse_fix_v4bx(const char*, const char*,
 714                                 Command_line*)
 715 {
 716   this->fix_v4bx_ = FIX_V4BX_REPLACE;
 717 }
 718
 719 void
 720 General_options::parse_fix_v4bx_interworking(const char*, const char*,
 721                                              Command_line*)
 722 {
 723   this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
 724 }
 725
 726 void
 727 General_options::parse_EB(const char*, const char*, Command_line*)
 728 {
 729   this->endianness_ = ENDIANNESS_BIG;
 730 }
 731
 732 void
 733 General_options::parse_EL(const char*, const char*, Command_line*)
 734 {
 735   this->endianness_ = ENDIANNESS_LITTLE;
 736 }
 737
 738 void
 739 General_options::copy_from_posdep_options(
 740     const Position_dependent_options& posdep)
 741 {
 742   this->set_as_needed(posdep.as_needed());
 743   this->set_Bdynamic(posdep.Bdynamic());
 744   this->set_format(
 745       General_options::object_format_to_string(posdep.format_enum()));
 746   this->set_whole_archive(posdep.whole_archive());
 747   this->set_incremental_disposition(posdep.incremental_disposition());
 748 }
 749
 750 void
 751 General_options::parse_push_state(const char*, const char*, Command_line*)
 752 {
 753   Position_dependent_options* posdep = new Position_dependent_options(*this);
 754   this->options_stack_.push_back(posdep);
 755 }
 756
 757 void
 758 General_options::parse_pop_state(const char*, const char*, Command_line*)
 759 {
 760   if (this->options_stack_.empty())
 761     {
 762       gold::gold_error(_("unbalanced --push-state/--pop-state"));
 763       return;
 764     }
 765   Position_dependent_options* posdep = this->options_stack_.back();
 766   this->options_stack_.pop_back();
 767   this->copy_from_posdep_options(*posdep);
 768   delete posdep;
 769 }
 770
 771 } // End namespace gold.
 772
 773 namespace
 774 {
 775
 776 void
 777 usage()
 778 {
 779   fprintf(stderr,
 780           _("%s: use the --help option for usage information\n"),
 781           gold::program_name);
 782   ::exit(EXIT_FAILURE);
 783 }
 784
 785 void
 786 usage(const char* msg, const char* opt)
 787 {
 788   fprintf(stderr,
 789           _("%s: %s: %s\n"),
 790           gold::program_name, opt, msg);
 791   usage();
 792 }
 793
 794 // If the default sysroot is relocatable, try relocating it based on
 795 // the prefix FROM.
 796
 797 static char*
 798 get_relative_sysroot(const char* from)
 799 {
 800   char* path = make_relative_prefix(gold::program_name, from,
 801                                     TARGET_SYSTEM_ROOT);
 802   if (path != NULL)
 803     {
 804       struct stat s;
 805       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 806         return path;
 807       free(path);
 808     }
 809
 810   return NULL;
 811 }
 812
 813 // Return the default sysroot.  This is set by the --with-sysroot
 814 // option to configure.  Note we do not free the return value of
 815 // get_relative_sysroot, which is a small memory leak, but is
 816 // necessary since we store this pointer directly in General_options.
 817
 818 static const char*
 819 get_default_sysroot()
 820 {
 821   const char* sysroot = TARGET_SYSTEM_ROOT;
 822   if (*sysroot == '\0')
 823     return NULL;
 824
 825   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 826     {
 827       char* path = get_relative_sysroot(BINDIR);
 828       if (path == NULL)
 829         path = get_relative_sysroot(TOOLBINDIR);
 830       if (path != NULL)
 831         return path;
 832     }
 833
 834   return sysroot;
 835 }
 836
 837 // Parse a long option.  Such options have the form
 838 // <-|--><option>[=arg].  If "=arg" is not present but the option
 839 // takes an argument, the next word is taken to the be the argument.
 840 // If equals_only is set, then only the <option>=<arg> form is
 841 // accepted, not the <option><space><arg> form.  Returns a One_option
 842 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 843 // the not-NULL case, *arg is set to the option's argument (NULL if
 844 // the option takes no argument), and *i is advanced past this option.
 845 // NOTE: it is safe for argv and arg to point to the same place.
 846 gold::options::One_option*
 847 parse_long_option(int argc, const char** argv, bool equals_only,
 848                   const char** arg, int* i)
 849 {
 850   const char* const this_argv = argv[*i];
 851
 852   const char* equals = strchr(this_argv, '=');
 853   const char* option_start = this_argv + strspn(this_argv, "-");
 854   std::string option(option_start,
 855                      equals ? equals - option_start : strlen(option_start));
 856
 857   gold::options::Option_map::iterator it
 858       = gold::options::long_options->find(option);
 859   if (it == gold::options::long_options->end())
 860     return NULL;
 861
 862   gold::options::One_option* retval = it->second;
 863
 864   // If the dash-count doesn't match, we fail.
 865   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 866     {
 867       if (retval->dashes != gold::options::DASH_Z)
 868         return NULL;
 869     }
 870   else if (this_argv[1] != '-')   // one dash
 871     {
 872       if (retval->dashes != gold::options::ONE_DASH
 873           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 874           && retval->dashes != gold::options::TWO_DASHES)
 875         return NULL;
 876     }
 877   else                            // two dashes (or more!)
 878     {
 879       if (retval->dashes != gold::options::TWO_DASHES
 880           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 881           && retval->dashes != gold::options::ONE_DASH)
 882         return NULL;
 883     }
 884
 885   // Now that we know the option is good (or else bad in a way that
 886   // will cause us to die), increment i to point past this argv.
 887   ++(*i);
 888
 889   // Figure out the option's argument, if any.
 890   if (!retval->takes_argument())
 891     {
 892       if (equals)
 893         usage(_("unexpected argument"), this_argv);
 894       else
 895         *arg = NULL;
 896     }
 897   else
 898     {
 899       if (equals)
 900         *arg = equals + 1;
 901       else if (retval->takes_optional_argument())
 902         *arg = retval->default_value;
 903       else if (*i < argc && !equals_only)
 904         *arg = argv[(*i)++];
 905       else
 906         usage(_("missing argument"), this_argv);
 907     }
 908
 909   return retval;
 910 }
 911
 912 // Parse a short option.  Such options have the form -<option>[arg].
 913 // If "arg" is not present but the option takes an argument, the next
 914 // word is taken to the be the argument.  If the option does not take
 915 // an argument, it may be followed by another short option.  Returns a
 916 // One_option struct or NULL if argv[i] cannot be parsed as a short
 917 // option.  In the not-NULL case, *arg is set to the option's argument
 918 // (NULL if the option takes no argument), and *i is advanced past
 919 // this option.  This function keeps *i the same if we parsed a short
 920 // option that does not take an argument, that looks to be followed by
 921 // another short option in the same word.
 922 gold::options::One_option*
 923 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 924                    const char** arg, int* i)
 925 {
 926   const char* const this_argv = argv[*i];
 927
 928   if (this_argv[0] != '-')
 929     return NULL;
 930
 931   // We handle -z as a special case.
 932   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 933                                           'z', "", NULL, "Z-OPTION", false,
 934                                           NULL, false);
 935   gold::options::One_option* retval = NULL;
 936   if (this_argv[pos_in_argv_i] == 'z')
 937     retval = &dash_z;
 938   else
 939     {
 940       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 941       if (char_as_int > 0 && char_as_int < 128)
 942         retval = gold::options::short_options[char_as_int];
 943     }
 944
 945   if (retval == NULL)
 946     return NULL;
 947
 948   // Figure out the option's argument, if any.
 949   if (!retval->takes_argument())
 950     {
 951       *arg = NULL;
 952       // We only advance past this argument if it's the only one in argv.
 953       if (this_argv[pos_in_argv_i + 1] == '\0')
 954         ++(*i);
 955     }
 956   else
 957     {
 958       // If we take an argument, we'll eat up this entire argv entry.
 959       ++(*i);
 960       if (this_argv[pos_in_argv_i + 1] != '\0')
 961         *arg = this_argv + pos_in_argv_i + 1;
 962       else if (retval->takes_optional_argument())
 963         *arg = retval->default_value;
 964       else if (*i < argc)
 965         *arg = argv[(*i)++];
 966       else
 967         usage(_("missing argument"), this_argv);
 968     }
 969
 970   // If we're a -z option, we need to parse our argument as a
 971   // long-option, e.g. "-z stacksize=8192".
 972   if (retval == &dash_z)
 973     {
 974       int dummy_i = 0;
 975       const char* dash_z_arg = *arg;
 976       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 977       if (retval == NULL)
 978         usage(_("unknown -z option"), dash_z_arg);
 979     }
 980
 981   return retval;
 982 }
 983
 984 } // End anonymous namespace.
 985
 986 namespace gold
 987 {
 988
 989 General_options::General_options()
 990   : printed_version_(false),
 991     execstack_status_(EXECSTACK_FROM_INPUT),
 992     icf_status_(ICF_NONE),
 993     static_(false),
 994     do_demangle_(false),
 995     plugins_(NULL),
 996     dynamic_list_(),
 997     have_dynamic_list_(false),
 998     incremental_mode_(INCREMENTAL_OFF),
 999     incremental_disposition_(INCREMENTAL_STARTUP),
1000     incremental_startup_disposition_(INCREMENTAL_CHECK),
1001     implicit_incremental_(false),
1002     excluded_libs_(),
1003     symbols_to_retain_(),
1004     section_starts_(),
1005     fix_v4bx_(FIX_V4BX_NONE),
1006     endianness_(ENDIANNESS_NOT_SET),
1007     discard_locals_(DISCARD_SEC_MERGE),
1008     orphan_handling_enum_(ORPHAN_PLACE),
1009     start_stop_visibility_enum_(elfcpp::STV_PROTECTED)
1010 {
1011   // Turn off option registration once construction is complete.
1012   gold::options::ready_to_register = false;
1013 }
1014
1015 General_options::Object_format
1016 General_options::format_enum() const
1017 {
1018   return General_options::string_to_object_format(this->format());
1019 }
1020
1021 General_options::Object_format
1022 General_options::oformat_enum() const
1023 {
1024   return General_options::string_to_object_format(this->oformat());
1025 }
1026
1027 // Add the sysroot, if any, to the search paths.
1028
1029 void
1030 General_options::add_sysroot()
1031 {
1032   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1033     {
1034       this->set_sysroot(get_default_sysroot());
1035       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1036         return;
1037     }
1038
1039   char* canonical_sysroot = lrealpath(this->sysroot());
1040
1041   for (Dir_list::iterator p = this->library_path_.value.begin();
1042        p != this->library_path_.value.end();
1043        ++p)
1044     p->add_sysroot(this->sysroot(), canonical_sysroot);
1045
1046   free(canonical_sysroot);
1047 }
1048
1049 // Return whether FILENAME is in a system directory.
1050
1051 bool
1052 General_options::is_in_system_directory(const std::string& filename) const
1053 {
1054   for (Dir_list::const_iterator p = this->library_path_.value.begin();
1055        p != this->library_path_.value.end();
1056        ++p)
1057     {
1058       // We use a straight string comparison rather than calling
1059       // FILENAME_CMP because we are only interested in the cases
1060       // where we found the file in a system directory, which means
1061       // that we used the directory name as a prefix for a -L search.
1062       if (p->is_system_directory()
1063           && filename.compare(0, p->name().size(), p->name()) == 0)
1064         return true;
1065     }
1066   return false;
1067 }
1068
1069 // Add a plugin to the list of plugins.
1070
1071 void
1072 General_options::add_plugin(const char* filename)
1073 {
1074   if (this->plugins_ == NULL)
1075     this->plugins_ = new Plugin_manager(*this);
1076   this->plugins_->add_plugin(filename);
1077 }
1078
1079 // Add a plugin option to a plugin.
1080
1081 void
1082 General_options::add_plugin_option(const char* arg)
1083 {
1084   if (this->plugins_ == NULL)
1085     gold_fatal("--plugin-opt requires --plugin.");
1086   this->plugins_->add_plugin_option(arg);
1087 }
1088
1089 // Set up variables and other state that isn't set up automatically by
1090 // the parse routine, and ensure options don't contradict each other
1091 // and are otherwise kosher.
1092
1093 void
1094 General_options::finalize()
1095 {
1096   // Normalize the strip modifiers.  They have a total order:
1097   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
1098   // If one is true, set all beneath it to true as well.
1099   if (this->strip_all())
1100     this->set_strip_debug(true);
1101   if (this->strip_debug())
1102     this->set_strip_debug_non_line(true);
1103   if (this->strip_debug_non_line())
1104     this->set_strip_debug_gdb(true);
1105
1106   if (this->Bshareable())
1107     this->set_shared(true);
1108
1109   // If the user specifies both -s and -r, convert the -s to -S.
1110   // -r requires us to keep externally visible symbols!
1111   if (this->strip_all() && this->relocatable())
1112     {
1113       this->set_strip_all(false);
1114       gold_assert(this->strip_debug());
1115     }
1116
1117   // For us, -dc and -dp are synonyms for --define-common.
1118   if (this->dc())
1119     this->set_define_common(true);
1120   if (this->dp())
1121     this->set_define_common(true);
1122
1123   // We also set --define-common if we're not relocatable, as long as
1124   // the user didn't explicitly ask for something different.
1125   if (!this->user_set_define_common())
1126     this->set_define_common(!this->relocatable());
1127
1128   // execstack_status_ is a three-state variable; update it based on
1129   // -z [no]execstack.
1130   if (this->execstack())
1131     this->set_execstack_status(EXECSTACK_YES);
1132   else if (this->noexecstack())
1133     this->set_execstack_status(EXECSTACK_NO);
1134
1135   // icf_status_ is a three-state variable; update it based on the
1136   // value of this->icf().
1137   if (strcmp(this->icf(), "none") == 0)
1138     this->set_icf_status(ICF_NONE);
1139   else if (strcmp(this->icf(), "safe") == 0)
1140     this->set_icf_status(ICF_SAFE);
1141   else
1142     this->set_icf_status(ICF_ALL);
1143
1144   // Handle the optional argument for --demangle.
1145   if (this->user_set_demangle())
1146     {
1147       this->set_do_demangle(true);
1148       const char* style = this->demangle();
1149       if (*style != '\0')
1150         {
1151           enum demangling_styles style_code;
1152
1153           style_code = cplus_demangle_name_to_style(style);
1154           if (style_code == unknown_demangling)
1155             gold_fatal("unknown demangling style '%s'", style);
1156           cplus_demangle_set_style(style_code);
1157         }
1158     }
1159   else if (this->user_set_no_demangle())
1160     this->set_do_demangle(false);
1161   else
1162     {
1163       // Testing COLLECT_NO_DEMANGLE makes our default demangling
1164       // behaviour identical to that of gcc's linker wrapper.
1165       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1166     }
1167
1168   // Parse the --orphan-handling argument.
1169   if (this->user_set_orphan_handling())
1170     {
1171       if (strcmp(this->orphan_handling(), "place") == 0)
1172         this->set_orphan_handling_enum(ORPHAN_PLACE);
1173       else if (strcmp(this->orphan_handling(), "discard") == 0)
1174         this->set_orphan_handling_enum(ORPHAN_DISCARD);
1175       else if (strcmp(this->orphan_handling(), "warn") == 0)
1176         this->set_orphan_handling_enum(ORPHAN_WARN);
1177       else if (strcmp(this->orphan_handling(), "error") == 0)
1178         this->set_orphan_handling_enum(ORPHAN_ERROR);
1179     }
1180
1181   // Parse the -z start-stop-visibility argument.
1182   if (this->user_set_start_stop_visibility())
1183     {
1184       if (strcmp(this->start_stop_visibility(), "default") == 0)
1185         this->set_start_stop_visibility_enum(elfcpp::STV_DEFAULT);
1186       else if (strcmp(this->start_stop_visibility(), "internal") == 0)
1187         this->set_start_stop_visibility_enum(elfcpp::STV_INTERNAL);
1188       else if (strcmp(this->start_stop_visibility(), "hidden") == 0)
1189         this->set_start_stop_visibility_enum(elfcpp::STV_HIDDEN);
1190       else if (strcmp(this->start_stop_visibility(), "protected") == 0)
1191         this->set_start_stop_visibility_enum(elfcpp::STV_PROTECTED);
1192     }
1193
1194   // Parse the --power10-stubs argument.
1195   if (!this->user_set_power10_stubs())
1196     {
1197       // --power10-stubs without an arg is equivalent to --power10-stubs=yes
1198       // but not specifying --power10-stubs at all should be equivalent to
1199       // --power10-stubs=auto.  This doesn't fit into the notion of
1200       // "default_value", used both as a static initializer and to provide
1201       // a missing optional arg.  Fix it here.
1202       this->set_power10_stubs("auto");
1203       this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
1204     }
1205   else
1206     {
1207       if (strcmp(this->power10_stubs(), "auto") == 0)
1208         this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
1209       else if (strcmp(this->power10_stubs(), "no") == 0)
1210         this->set_power10_stubs_enum(POWER10_STUBS_NO);
1211       else if (strcmp(this->power10_stubs(), "yes") == 0)
1212         this->set_power10_stubs_enum(POWER10_STUBS_YES);
1213     }
1214
1215   // -M is equivalent to "-Map -".
1216   if (this->print_map() && !this->user_set_Map())
1217     {
1218       this->set_Map("-");
1219       this->set_user_set_Map();
1220     }
1221
1222   // Using -n or -N implies -static.
1223   if (this->nmagic() || this->omagic())
1224     this->set_static(true);
1225
1226   // If --thread_count is specified, it applies to
1227   // --thread-count-{initial,middle,final}, though it doesn't override
1228   // them.
1229   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1230     this->set_thread_count_initial(this->thread_count());
1231   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1232     this->set_thread_count_middle(this->thread_count());
1233   if (this->thread_count() > 0 && this->thread_count_final() == 0)
1234     this->set_thread_count_final(this->thread_count());
1235
1236   // Let's warn if you set the thread-count but we're going to ignore it.
1237 #ifndef ENABLE_THREADS
1238   if (this->threads())
1239     {
1240       gold_warning(_("ignoring --threads: "
1241                      "%s was compiled without thread support"),
1242                    program_name);
1243       this->set_threads(false);
1244     }
1245   if (this->thread_count() > 0 || this->thread_count_initial() > 0
1246       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1247     gold_warning(_("ignoring --thread-count: "
1248                    "%s was compiled without thread support"),
1249                  program_name);
1250 #endif
1251
1252 #ifndef ENABLE_PLUGINS
1253   if (this->has_plugins())
1254     gold_fatal(_("cannot use --plugin: "
1255                  "%s was compiled without plugin support"),
1256                program_name);
1257 #endif
1258
1259   std::string libpath;
1260   if (this->user_set_Y())
1261     {
1262       libpath = this->Y();
1263       if (libpath.compare(0, 2, "P,") == 0)
1264         libpath.erase(0, 2);
1265     }
1266   else if (!this->nostdlib())
1267     {
1268 #ifndef NATIVE_LINKER
1269 #define NATIVE_LINKER 0
1270 #endif
1271       const char* p = LIB_PATH;
1272       if (strcmp(p, "::DEFAULT::") != 0)
1273         libpath = p;
1274       else if (NATIVE_LINKER
1275                || this->user_set_sysroot()
1276                || *TARGET_SYSTEM_ROOT != '\0')
1277         {
1278           this->add_to_library_path_with_sysroot("/lib");
1279           this->add_to_library_path_with_sysroot("/usr/lib");
1280         }
1281       else
1282         this->add_to_library_path_with_sysroot(TOOLLIBDIR);
1283     }
1284
1285   if (!libpath.empty())
1286     {
1287       size_t pos = 0;
1288       size_t next_pos;
1289       do
1290         {
1291           next_pos = libpath.find(':', pos);
1292           size_t len = (next_pos == std::string::npos
1293                         ? next_pos
1294                         : next_pos - pos);
1295           if (len != 0)
1296             this->add_to_library_path_with_sysroot(libpath.substr(pos, len));
1297           pos = next_pos + 1;
1298         }
1299       while (next_pos != std::string::npos);
1300     }
1301
1302   // Parse the contents of -retain-symbols-file into a set.
1303   if (this->retain_symbols_file())
1304     {
1305       std::ifstream in;
1306       in.open(this->retain_symbols_file());
1307       if (!in)
1308         gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1309                    this->retain_symbols_file(), strerror(errno));
1310       std::string line;
1311       std::getline(in, line);   // this chops off the trailing \n, if any
1312       while (in)
1313         {
1314           if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1315             line.resize(line.length() - 1);
1316           this->symbols_to_retain_.insert(line);
1317           std::getline(in, line);
1318         }
1319     }
1320
1321   // -Bgroup implies --unresolved-symbols=report-all.
1322   if (this->Bgroup() && !this->user_set_unresolved_symbols())
1323     this->set_unresolved_symbols("report-all");
1324
1325   // -shared implies --allow-shlib-undefined.  Currently
1326   // ---allow-shlib-undefined controls warnings issued based on the
1327   // -symbol table.  --unresolved-symbols controls warnings issued
1328   // -based on relocations.
1329   if (this->shared() && !this->user_set_allow_shlib_undefined())
1330     this->set_allow_shlib_undefined(true);
1331
1332   // Normalize library_path() by adding the sysroot to all directories
1333   // in the path, as appropriate.
1334   this->add_sysroot();
1335
1336   // Now that we've normalized the options, check for contradictory ones.
1337   if (this->shared() && this->is_static())
1338     gold_fatal(_("-shared and -static are incompatible"));
1339   if (this->shared() && this->pie())
1340     gold_fatal(_("-shared and -pie are incompatible"));
1341   if (this->pie() && this->is_static())
1342     gold_fatal(_("-pie and -static are incompatible"));
1343
1344   if (this->shared() && this->relocatable())
1345     gold_fatal(_("-shared and -r are incompatible"));
1346   if (this->pie() && this->relocatable())
1347     gold_fatal(_("-pie and -r are incompatible"));
1348
1349   if (!this->shared())
1350     {
1351       if (this->filter() != NULL)
1352         gold_fatal(_("-F/--filter may not used without -shared"));
1353       if (this->any_auxiliary())
1354         gold_fatal(_("-f/--auxiliary may not be used without -shared"));
1355     }
1356
1357   // TODO: implement support for -retain-symbols-file with -r, if needed.
1358   if (this->relocatable() && this->retain_symbols_file())
1359     gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1360
1361   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1362       && (this->shared()
1363           || this->pie()
1364           || this->relocatable()))
1365     gold_fatal(_("binary output format not compatible "
1366                  "with -shared or -pie or -r"));
1367
1368   if (this->user_set_hash_bucket_empty_fraction()
1369       && (this->hash_bucket_empty_fraction() < 0.0
1370           || this->hash_bucket_empty_fraction() >= 1.0))
1371     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1372                  "[0.0, 1.0)"),
1373                this->hash_bucket_empty_fraction());
1374
1375   if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1376     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1377                  "--incremental-unknown require the use of --incremental"));
1378
1379   // Check for options that are not compatible with incremental linking.
1380   // Where an option can be disabled without seriously changing the semantics
1381   // of the link, we turn the option off; otherwise, we issue a fatal error.
1382
1383   if (this->incremental_mode_ != INCREMENTAL_OFF)
1384     {
1385       if (this->relocatable())
1386         gold_fatal(_("incremental linking is not compatible with -r"));
1387       if (this->emit_relocs())
1388         gold_fatal(_("incremental linking is not compatible with "
1389                      "--emit-relocs"));
1390       if (this->has_plugins())
1391         gold_fatal(_("incremental linking is not compatible with --plugin"));
1392       if (this->relro())
1393         gold_fatal(_("incremental linking is not compatible with -z relro"));
1394       if (this->pie())
1395         gold_fatal(_("incremental linking is not compatible with -pie"));
1396       if (this->gc_sections())
1397         {
1398           gold_warning(_("ignoring --gc-sections for an incremental link"));
1399           this->set_gc_sections(false);
1400         }
1401       if (this->icf_enabled())
1402         {
1403           gold_warning(_("ignoring --icf for an incremental link"));
1404           this->set_icf_status(ICF_NONE);
1405         }
1406       if (strcmp(this->compress_debug_sections(), "none") != 0)
1407         {
1408           gold_warning(_("ignoring --compress-debug-sections for an "
1409                          "incremental link"));
1410           this->set_compress_debug_sections("none");
1411         }
1412     }
1413
1414   // --rosegment-gap implies --rosegment.
1415   if (this->user_set_rosegment_gap())
1416     this->set_rosegment(true);
1417
1418   // FIXME: we can/should be doing a lot more sanity checking here.
1419 }
1420
1421 // Search_directory methods.
1422
1423 // This is called if we have a sysroot.  Apply the sysroot if
1424 // appropriate.  Record whether the directory is in the sysroot.
1425
1426 void
1427 Search_directory::add_sysroot(const char* sysroot,
1428                               const char* canonical_sysroot)
1429 {
1430   gold_assert(*sysroot != '\0');
1431   if (this->put_in_sysroot_)
1432     {
1433       if (!IS_DIR_SEPARATOR(this->name_[0])
1434           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1435         this->name_ = '/' + this->name_;
1436       this->name_ = sysroot + this->name_;
1437       this->is_in_sysroot_ = true;
1438     }
1439   else
1440     {
1441       // Check whether this entry is in the sysroot.  To do this
1442       // correctly, we need to use canonical names.  Otherwise we will
1443       // get confused by the ../../.. paths that gcc tends to use.
1444       char* canonical_name = lrealpath(this->name_.c_str());
1445       int canonical_name_len = strlen(canonical_name);
1446       int canonical_sysroot_len = strlen(canonical_sysroot);
1447       if (canonical_name_len > canonical_sysroot_len
1448           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1449         {
1450           canonical_name[canonical_sysroot_len] = '\0';
1451           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1452             this->is_in_sysroot_ = true;
1453         }
1454       free(canonical_name);
1455     }
1456 }
1457
1458 // Input_arguments methods.
1459
1460 // Add a file to the list.
1461
1462 Input_argument&
1463 Input_arguments::add_file(Input_file_argument& file)
1464 {
1465   file.set_arg_serial(++this->file_count_);
1466   if (this->in_group_)
1467     {
1468       gold_assert(!this->input_argument_list_.empty());
1469       gold_assert(this->input_argument_list_.back().is_group());
1470       return this->input_argument_list_.back().group()->add_file(file);
1471     }
1472   if (this->in_lib_)
1473     {
1474       gold_assert(!this->input_argument_list_.empty());
1475       gold_assert(this->input_argument_list_.back().is_lib());
1476       return this->input_argument_list_.back().lib()->add_file(file);
1477     }
1478   this->input_argument_list_.push_back(Input_argument(file));
1479   return this->input_argument_list_.back();
1480 }
1481
1482 // Start a group.
1483
1484 void
1485 Input_arguments::start_group()
1486 {
1487   if (this->in_group_)
1488     gold_fatal(_("May not nest groups"));
1489   if (this->in_lib_)
1490     gold_fatal(_("may not nest groups in libraries"));
1491   Input_file_group* group = new Input_file_group();
1492   this->input_argument_list_.push_back(Input_argument(group));
1493   this->in_group_ = true;
1494 }
1495
1496 // End a group.
1497
1498 void
1499 Input_arguments::end_group()
1500 {
1501   if (!this->in_group_)
1502     gold_fatal(_("Group end without group start"));
1503   this->in_group_ = false;
1504 }
1505
1506 // Start a lib.
1507
1508 void
1509 Input_arguments::start_lib(const Position_dependent_options& options)
1510 {
1511   if (this->in_lib_)
1512     gold_fatal(_("may not nest libraries"));
1513   if (this->in_group_)
1514     gold_fatal(_("may not nest libraries in groups"));
1515   Input_file_lib* lib = new Input_file_lib(options);
1516   this->input_argument_list_.push_back(Input_argument(lib));
1517   this->in_lib_ = true;
1518 }
1519
1520 // End a lib.
1521
1522 void
1523 Input_arguments::end_lib()
1524 {
1525   if (!this->in_lib_)
1526     gold_fatal(_("lib end without lib start"));
1527   this->in_lib_ = false;
1528 }
1529
1530 // Command_line options.
1531
1532 Command_line::Command_line()
1533 {
1534 }
1535
1536 // Pre_options is the hook that sets the ready_to_register flag.
1537
1538 Command_line::Pre_options::Pre_options()
1539 {
1540   gold::options::ready_to_register = true;
1541 }
1542
1543 // Process the command line options.  For process_one_option, i is the
1544 // index of argv to process next, and must be an option (that is,
1545 // start with a dash).  The return value is the index of the next
1546 // option to process (i+1 or i+2, or argc to indicate processing is
1547 // done).  no_more_options is set to true if (and when) "--" is seen
1548 // as an option.
1549
1550 int
1551 Command_line::process_one_option(int argc, const char** argv, int i,
1552                                  bool* no_more_options)
1553 {
1554   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1555
1556   // If we are reading "--", then just set no_more_options and return.
1557   if (argv[i][1] == '-' && argv[i][2] == '\0')
1558     {
1559       *no_more_options = true;
1560       return i + 1;
1561     }
1562
1563   int new_i = i;
1564   options::One_option* option = NULL;
1565   const char* arg = NULL;
1566
1567   // First, try to process argv as a long option.
1568   option = parse_long_option(argc, argv, false, &arg, &new_i);
1569   if (option)
1570     {
1571       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1572       return new_i;
1573     }
1574
1575   // Now, try to process argv as a short option.  Since several short
1576   // options can be combined in one argv, we may have to parse a lot
1577   // until we're done reading this argv.
1578   int pos_in_argv_i = 1;
1579   while (new_i == i)
1580     {
1581       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1582       if (!option)
1583         break;
1584       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1585       ++pos_in_argv_i;
1586     }
1587   if (option)
1588     return new_i;
1589
1590   // I guess it's neither a long option nor a short option.
1591   usage(_("unknown option"), argv[i]);
1592   return argc;
1593 }
1594
1595
1596 void
1597 Command_line::process(int argc, const char** argv)
1598 {
1599   bool no_more_options = false;
1600   int i = 0;
1601   while (i < argc)
1602     {
1603       this->position_options_.copy_from_options(this->options());
1604       if (no_more_options || argv[i][0] != '-')
1605         {
1606           Input_file_argument file(argv[i],
1607                                    Input_file_argument::INPUT_FILE_TYPE_FILE,
1608                                    "", false, this->position_options_);
1609           this->inputs_.add_file(file);
1610           ++i;
1611         }
1612       else
1613         i = process_one_option(argc, argv, i, &no_more_options);
1614     }
1615
1616   if (this->inputs_.in_group())
1617     {
1618       fprintf(stderr, _("%s: missing group end\n"), program_name);
1619       usage();
1620     }
1621
1622   if (this->inputs_.in_lib())
1623     {
1624       fprintf(stderr, _("%s: missing lib end\n"), program_name);
1625       usage();
1626     }
1627
1628   // Normalize the options and ensure they don't contradict each other.
1629   this->options_.finalize();
1630 }
1631
1632 // Finalize the version script options and return them.
1633
1634 const Version_script_info&
1635 Command_line::version_script()
1636 {
1637   this->options_.finalize_dynamic_list();
1638   Version_script_info* vsi = this->script_options_.version_script_info();
1639   vsi->finalize();
1640   return *vsi;
1641 }
1642
1643 } // End namespace gold.