gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright (C) 2006-2017 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 #ifdef ENABLE_PLUGINS
 452 void
 453 General_options::parse_plugin(const char*, const char* arg,
 454                               Command_line*)
 455 {
 456   this->add_plugin(arg);
 457 }
 458
 459 // Parse --plugin-opt.
 460
 461 void
 462 General_options::parse_plugin_opt(const char*, const char* arg,
 463                                   Command_line*)
 464 {
 465   this->add_plugin_option(arg);
 466 }
 467 #endif // ENABLE_PLUGINS
 468
 469 void
 470 General_options::parse_R(const char* option, const char* arg,
 471                          Command_line* cmdline)
 472 {
 473   struct stat s;
 474   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 475     this->add_to_rpath(arg);
 476   else
 477     this->parse_just_symbols(option, arg, cmdline);
 478 }
 479
 480 void
 481 General_options::parse_just_symbols(const char*, const char* arg,
 482                                     Command_line* cmdline)
 483 {
 484   Input_file_argument file(arg, Input_file_argument::INPUT_FILE_TYPE_FILE,
 485                            "", true, *this);
 486   cmdline->inputs().add_file(file);
 487 }
 488
 489 // Handle --section-start.
 490
 491 void
 492 General_options::parse_section_start(const char*, const char* arg,
 493                                      Command_line*)
 494 {
 495   const char* eq = strchr(arg, '=');
 496   if (eq == NULL)
 497     {
 498       gold_error(_("invalid argument to --section-start; "
 499                    "must be SECTION=ADDRESS"));
 500       return;
 501     }
 502
 503   std::string section_name(arg, eq - arg);
 504
 505   ++eq;
 506   const char* val_start = eq;
 507   if (eq[0] == '0' && (eq[1] == 'x' || eq[1] == 'X'))
 508     eq += 2;
 509   if (*eq == '\0')
 510     {
 511       gold_error(_("--section-start address missing"));
 512       return;
 513     }
 514   uint64_t addr = 0;
 515   hex_init();
 516   for (; *eq != '\0'; ++eq)
 517     {
 518       if (!hex_p(*eq))
 519         {
 520           gold_error(_("--section-start argument %s is not a valid hex number"),
 521                      val_start);
 522           return;
 523         }
 524       addr <<= 4;
 525       addr += hex_value(*eq);
 526     }
 527
 528   this->section_starts_[section_name] = addr;
 529 }
 530
 531 // Look up a --section-start value.
 532
 533 bool
 534 General_options::section_start(const char* secname, uint64_t* paddr) const
 535 {
 536   if (this->section_starts_.empty())
 537     return false;
 538   std::map<std::string, uint64_t>::const_iterator p =
 539     this->section_starts_.find(secname);
 540   if (p == this->section_starts_.end())
 541     return false;
 542   *paddr = p->second;
 543   return true;
 544 }
 545
 546 void
 547 General_options::parse_static(const char*, const char*, Command_line*)
 548 {
 549   this->set_static(true);
 550 }
 551
 552 void
 553 General_options::parse_script(const char*, const char* arg,
 554                               Command_line* cmdline)
 555 {
 556   if (!read_commandline_script(arg, cmdline))
 557     gold::gold_fatal(_("unable to parse script file %s"), arg);
 558 }
 559
 560 void
 561 General_options::parse_version_script(const char*, const char* arg,
 562                                       Command_line* cmdline)
 563 {
 564   if (!read_version_script(arg, cmdline))
 565     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 566 }
 567
 568 void
 569 General_options::parse_dynamic_list(const char*, const char* arg,
 570                                     Command_line* cmdline)
 571 {
 572   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 573     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 574   this->have_dynamic_list_ = true;
 575 }
 576
 577 void
 578 General_options::parse_start_group(const char*, const char*,
 579                                    Command_line* cmdline)
 580 {
 581   cmdline->inputs().start_group();
 582 }
 583
 584 void
 585 General_options::parse_end_group(const char*, const char*,
 586                                  Command_line* cmdline)
 587 {
 588   cmdline->inputs().end_group();
 589 }
 590
 591 void
 592 General_options::parse_start_lib(const char*, const char*,
 593                                  Command_line* cmdline)
 594 {
 595   cmdline->inputs().start_lib(cmdline->position_dependent_options());
 596 }
 597
 598 void
 599 General_options::parse_end_lib(const char*, const char*,
 600                                Command_line* cmdline)
 601 {
 602   cmdline->inputs().end_lib();
 603 }
 604
 605 // The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
 606 // of names separated by commas or colons and puts them in a linked list.
 607 // We implement the same parsing of names here but store names in an unordered
 608 // map to speed up searching of names.
 609
 610 void
 611 General_options::parse_exclude_libs(const char*, const char* arg,
 612                                     Command_line*)
 613 {
 614   const char* p = arg;
 615
 616   while (*p != '\0')
 617     {
 618       size_t length = strcspn(p, ",:");
 619       this->excluded_libs_.insert(std::string(p, length));
 620       p += (p[length] ? length + 1 : length);
 621     }
 622 }
 623
 624 // The checking logic is based on the function check_excluded_libs() in
 625 // ld/ldlang.c of GNU ld but our implementation is different because we use
 626 // an unordered map instead of a linked list, which is what GNU ld uses.  GNU
 627 // ld searches sequentially in the excluded libs list.  For a given archive,
 628 // a match is found if the archive's name matches exactly one of the list
 629 // entry or if the archive's name is of the form FOO.a and FOO matches exactly
 630 // one of the list entry.  An entry "ALL" in the list is considered as a
 631 // wild-card and matches any given name.
 632
 633 bool
 634 General_options::check_excluded_libs(const std::string &name) const
 635 {
 636   Unordered_set<std::string>::const_iterator p;
 637
 638   // Exit early for the most common case.
 639   if (excluded_libs_.empty())
 640     return false;
 641
 642   // If we see "ALL", all archives are excluded from automatic export.
 643   p = excluded_libs_.find(std::string("ALL"));
 644   if (p != excluded_libs_.end())
 645     return true;
 646
 647   // First strip off any directories in name.
 648   const char* basename = lbasename(name.c_str());
 649
 650   // Try finding an exact match.
 651   p = excluded_libs_.find(std::string(basename));
 652   if (p != excluded_libs_.end())
 653     return true;
 654
 655   // Try matching NAME without ".a" at the end.
 656   size_t length = strlen(basename);
 657   if ((length >= 2)
 658       && (basename[length - 2] == '.')
 659       && (basename[length - 1] == 'a'))
 660     {
 661       p = excluded_libs_.find(std::string(basename, length - 2));
 662       if (p != excluded_libs_.end())
 663         return true;
 664     }
 665
 666   return false;
 667 }
 668
 669 // Recognize input and output target names.  The GNU linker accepts
 670 // these with --format and --oformat.  This code is intended to be
 671 // minimally compatible.  In practice for an ELF target this would be
 672 // the same target as the input files; that name always start with
 673 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 674 // "binary", "ihex".
 675
 676 General_options::Object_format
 677 General_options::string_to_object_format(const char* arg)
 678 {
 679   if (strncmp(arg, "elf", 3) == 0 || strcmp(arg, "default") == 0)
 680     return gold::General_options::OBJECT_FORMAT_ELF;
 681   else if (strcmp(arg, "binary") == 0)
 682     return gold::General_options::OBJECT_FORMAT_BINARY;
 683   else
 684     {
 685       gold::gold_error(_("format '%s' not supported; treating as elf "
 686                          "(supported formats: elf, binary)"),
 687                        arg);
 688       return gold::General_options::OBJECT_FORMAT_ELF;
 689     }
 690 }
 691
 692 const char*
 693 General_options::object_format_to_string(General_options::Object_format fmt)
 694 {
 695   switch (fmt)
 696     {
 697     case General_options::OBJECT_FORMAT_ELF:
 698       return "elf";
 699     case General_options::OBJECT_FORMAT_BINARY:
 700       return "binary";
 701     default:
 702       gold_unreachable();
 703     }
 704 }
 705
 706 void
 707 General_options::parse_fix_v4bx(const char*, const char*,
 708                                 Command_line*)
 709 {
 710   this->fix_v4bx_ = FIX_V4BX_REPLACE;
 711 }
 712
 713 void
 714 General_options::parse_fix_v4bx_interworking(const char*, const char*,
 715                                              Command_line*)
 716 {
 717   this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
 718 }
 719
 720 void
 721 General_options::parse_EB(const char*, const char*, Command_line*)
 722 {
 723   this->endianness_ = ENDIANNESS_BIG;
 724 }
 725
 726 void
 727 General_options::parse_EL(const char*, const char*, Command_line*)
 728 {
 729   this->endianness_ = ENDIANNESS_LITTLE;
 730 }
 731
 732 void
 733 General_options::copy_from_posdep_options(
 734     const Position_dependent_options& posdep)
 735 {
 736   this->set_as_needed(posdep.as_needed());
 737   this->set_Bdynamic(posdep.Bdynamic());
 738   this->set_format(
 739       General_options::object_format_to_string(posdep.format_enum()));
 740   this->set_whole_archive(posdep.whole_archive());
 741   this->set_incremental_disposition(posdep.incremental_disposition());
 742 }
 743
 744 void
 745 General_options::parse_push_state(const char*, const char*, Command_line*)
 746 {
 747   Position_dependent_options* posdep = new Position_dependent_options(*this);
 748   this->options_stack_.push_back(posdep);
 749 }
 750
 751 void
 752 General_options::parse_pop_state(const char*, const char*, Command_line*)
 753 {
 754   if (this->options_stack_.empty())
 755     {
 756       gold::gold_error(_("unbalanced --push-state/--pop-state"));
 757       return;
 758     }
 759   Position_dependent_options* posdep = this->options_stack_.back();
 760   this->options_stack_.pop_back();
 761   this->copy_from_posdep_options(*posdep);
 762   delete posdep;
 763 }
 764
 765 } // End namespace gold.
 766
 767 namespace
 768 {
 769
 770 void
 771 usage()
 772 {
 773   fprintf(stderr,
 774           _("%s: use the --help option for usage information\n"),
 775           gold::program_name);
 776   ::exit(EXIT_FAILURE);
 777 }
 778
 779 void
 780 usage(const char* msg, const char* opt)
 781 {
 782   fprintf(stderr,
 783           _("%s: %s: %s\n"),
 784           gold::program_name, opt, msg);
 785   usage();
 786 }
 787
 788 // If the default sysroot is relocatable, try relocating it based on
 789 // the prefix FROM.
 790
 791 static char*
 792 get_relative_sysroot(const char* from)
 793 {
 794   char* path = make_relative_prefix(gold::program_name, from,
 795                                     TARGET_SYSTEM_ROOT);
 796   if (path != NULL)
 797     {
 798       struct stat s;
 799       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 800         return path;
 801       free(path);
 802     }
 803
 804   return NULL;
 805 }
 806
 807 // Return the default sysroot.  This is set by the --with-sysroot
 808 // option to configure.  Note we do not free the return value of
 809 // get_relative_sysroot, which is a small memory leak, but is
 810 // necessary since we store this pointer directly in General_options.
 811
 812 static const char*
 813 get_default_sysroot()
 814 {
 815   const char* sysroot = TARGET_SYSTEM_ROOT;
 816   if (*sysroot == '\0')
 817     return NULL;
 818
 819   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 820     {
 821       char* path = get_relative_sysroot(BINDIR);
 822       if (path == NULL)
 823         path = get_relative_sysroot(TOOLBINDIR);
 824       if (path != NULL)
 825         return path;
 826     }
 827
 828   return sysroot;
 829 }
 830
 831 // Parse a long option.  Such options have the form
 832 // <-|--><option>[=arg].  If "=arg" is not present but the option
 833 // takes an argument, the next word is taken to the be the argument.
 834 // If equals_only is set, then only the <option>=<arg> form is
 835 // accepted, not the <option><space><arg> form.  Returns a One_option
 836 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 837 // the not-NULL case, *arg is set to the option's argument (NULL if
 838 // the option takes no argument), and *i is advanced past this option.
 839 // NOTE: it is safe for argv and arg to point to the same place.
 840 gold::options::One_option*
 841 parse_long_option(int argc, const char** argv, bool equals_only,
 842                   const char** arg, int* i)
 843 {
 844   const char* const this_argv = argv[*i];
 845
 846   const char* equals = strchr(this_argv, '=');
 847   const char* option_start = this_argv + strspn(this_argv, "-");
 848   std::string option(option_start,
 849                      equals ? equals - option_start : strlen(option_start));
 850
 851   gold::options::Option_map::iterator it
 852       = gold::options::long_options->find(option);
 853   if (it == gold::options::long_options->end())
 854     return NULL;
 855
 856   gold::options::One_option* retval = it->second;
 857
 858   // If the dash-count doesn't match, we fail.
 859   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 860     {
 861       if (retval->dashes != gold::options::DASH_Z)
 862         return NULL;
 863     }
 864   else if (this_argv[1] != '-')   // one dash
 865     {
 866       if (retval->dashes != gold::options::ONE_DASH
 867           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 868           && retval->dashes != gold::options::TWO_DASHES)
 869         return NULL;
 870     }
 871   else                            // two dashes (or more!)
 872     {
 873       if (retval->dashes != gold::options::TWO_DASHES
 874           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 875           && retval->dashes != gold::options::ONE_DASH)
 876         return NULL;
 877     }
 878
 879   // Now that we know the option is good (or else bad in a way that
 880   // will cause us to die), increment i to point past this argv.
 881   ++(*i);
 882
 883   // Figure out the option's argument, if any.
 884   if (!retval->takes_argument())
 885     {
 886       if (equals)
 887         usage(_("unexpected argument"), this_argv);
 888       else
 889         *arg = NULL;
 890     }
 891   else
 892     {
 893       if (equals)
 894         *arg = equals + 1;
 895       else if (retval->takes_optional_argument())
 896         *arg = retval->default_value;
 897       else if (*i < argc && !equals_only)
 898         *arg = argv[(*i)++];
 899       else
 900         usage(_("missing argument"), this_argv);
 901     }
 902
 903   return retval;
 904 }
 905
 906 // Parse a short option.  Such options have the form -<option>[arg].
 907 // If "arg" is not present but the option takes an argument, the next
 908 // word is taken to the be the argument.  If the option does not take
 909 // an argument, it may be followed by another short option.  Returns a
 910 // One_option struct or NULL if argv[i] cannot be parsed as a short
 911 // option.  In the not-NULL case, *arg is set to the option's argument
 912 // (NULL if the option takes no argument), and *i is advanced past
 913 // this option.  This function keeps *i the same if we parsed a short
 914 // option that does not take an argument, that looks to be followed by
 915 // another short option in the same word.
 916 gold::options::One_option*
 917 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 918                    const char** arg, int* i)
 919 {
 920   const char* const this_argv = argv[*i];
 921
 922   if (this_argv[0] != '-')
 923     return NULL;
 924
 925   // We handle -z as a special case.
 926   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 927                                           'z', "", NULL, "Z-OPTION", false,
 928                                           NULL, false);
 929   gold::options::One_option* retval = NULL;
 930   if (this_argv[pos_in_argv_i] == 'z')
 931     retval = &dash_z;
 932   else
 933     {
 934       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 935       if (char_as_int > 0 && char_as_int < 128)
 936         retval = gold::options::short_options[char_as_int];
 937     }
 938
 939   if (retval == NULL)
 940     return NULL;
 941
 942   // Figure out the option's argument, if any.
 943   if (!retval->takes_argument())
 944     {
 945       *arg = NULL;
 946       // We only advance past this argument if it's the only one in argv.
 947       if (this_argv[pos_in_argv_i + 1] == '\0')
 948         ++(*i);
 949     }
 950   else
 951     {
 952       // If we take an argument, we'll eat up this entire argv entry.
 953       ++(*i);
 954       if (this_argv[pos_in_argv_i + 1] != '\0')
 955         *arg = this_argv + pos_in_argv_i + 1;
 956       else if (retval->takes_optional_argument())
 957         *arg = retval->default_value;
 958       else if (*i < argc)
 959         *arg = argv[(*i)++];
 960       else
 961         usage(_("missing argument"), this_argv);
 962     }
 963
 964   // If we're a -z option, we need to parse our argument as a
 965   // long-option, e.g. "-z stacksize=8192".
 966   if (retval == &dash_z)
 967     {
 968       int dummy_i = 0;
 969       const char* dash_z_arg = *arg;
 970       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 971       if (retval == NULL)
 972         usage(_("unknown -z option"), dash_z_arg);
 973     }
 974
 975   return retval;
 976 }
 977
 978 } // End anonymous namespace.
 979
 980 namespace gold
 981 {
 982
 983 General_options::General_options()
 984   : printed_version_(false),
 985     execstack_status_(EXECSTACK_FROM_INPUT),
 986     icf_status_(ICF_NONE),
 987     static_(false),
 988     do_demangle_(false),
 989     plugins_(NULL),
 990     dynamic_list_(),
 991     have_dynamic_list_(false),
 992     incremental_mode_(INCREMENTAL_OFF),
 993     incremental_disposition_(INCREMENTAL_STARTUP),
 994     incremental_startup_disposition_(INCREMENTAL_CHECK),
 995     implicit_incremental_(false),
 996     excluded_libs_(),
 997     symbols_to_retain_(),
 998     section_starts_(),
 999     fix_v4bx_(FIX_V4BX_NONE),
1000     endianness_(ENDIANNESS_NOT_SET),
1001     discard_locals_(DISCARD_SEC_MERGE),
1002     orphan_handling_enum_(ORPHAN_PLACE)
1003 {
1004   // Turn off option registration once construction is complete.
1005   gold::options::ready_to_register = false;
1006 }
1007
1008 General_options::Object_format
1009 General_options::format_enum() const
1010 {
1011   return General_options::string_to_object_format(this->format());
1012 }
1013
1014 General_options::Object_format
1015 General_options::oformat_enum() const
1016 {
1017   return General_options::string_to_object_format(this->oformat());
1018 }
1019
1020 // Add the sysroot, if any, to the search paths.
1021
1022 void
1023 General_options::add_sysroot()
1024 {
1025   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1026     {
1027       this->set_sysroot(get_default_sysroot());
1028       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1029         return;
1030     }
1031
1032   char* canonical_sysroot = lrealpath(this->sysroot());
1033
1034   for (Dir_list::iterator p = this->library_path_.value.begin();
1035        p != this->library_path_.value.end();
1036        ++p)
1037     p->add_sysroot(this->sysroot(), canonical_sysroot);
1038
1039   free(canonical_sysroot);
1040 }
1041
1042 // Return whether FILENAME is in a system directory.
1043
1044 bool
1045 General_options::is_in_system_directory(const std::string& filename) const
1046 {
1047   for (Dir_list::const_iterator p = this->library_path_.value.begin();
1048        p != this->library_path_.value.end();
1049        ++p)
1050     {
1051       // We use a straight string comparison rather than calling
1052       // FILENAME_CMP because we are only interested in the cases
1053       // where we found the file in a system directory, which means
1054       // that we used the directory name as a prefix for a -L search.
1055       if (p->is_system_directory()
1056           && filename.compare(0, p->name().size(), p->name()) == 0)
1057         return true;
1058     }
1059   return false;
1060 }
1061
1062 // Add a plugin to the list of plugins.
1063
1064 void
1065 General_options::add_plugin(const char* filename)
1066 {
1067   if (this->plugins_ == NULL)
1068     this->plugins_ = new Plugin_manager(*this);
1069   this->plugins_->add_plugin(filename);
1070 }
1071
1072 // Add a plugin option to a plugin.
1073
1074 void
1075 General_options::add_plugin_option(const char* arg)
1076 {
1077   if (this->plugins_ == NULL)
1078     gold_fatal("--plugin-opt requires --plugin.");
1079   this->plugins_->add_plugin_option(arg);
1080 }
1081
1082 // Set up variables and other state that isn't set up automatically by
1083 // the parse routine, and ensure options don't contradict each other
1084 // and are otherwise kosher.
1085
1086 void
1087 General_options::finalize()
1088 {
1089   // Normalize the strip modifiers.  They have a total order:
1090   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
1091   // If one is true, set all beneath it to true as well.
1092   if (this->strip_all())
1093     this->set_strip_debug(true);
1094   if (this->strip_debug())
1095     this->set_strip_debug_non_line(true);
1096   if (this->strip_debug_non_line())
1097     this->set_strip_debug_gdb(true);
1098
1099   if (this->Bshareable())
1100     this->set_shared(true);
1101
1102   // If the user specifies both -s and -r, convert the -s to -S.
1103   // -r requires us to keep externally visible symbols!
1104   if (this->strip_all() && this->relocatable())
1105     {
1106       this->set_strip_all(false);
1107       gold_assert(this->strip_debug());
1108     }
1109
1110   // For us, -dc and -dp are synonyms for --define-common.
1111   if (this->dc())
1112     this->set_define_common(true);
1113   if (this->dp())
1114     this->set_define_common(true);
1115
1116   // We also set --define-common if we're not relocatable, as long as
1117   // the user didn't explicitly ask for something different.
1118   if (!this->user_set_define_common())
1119     this->set_define_common(!this->relocatable());
1120
1121   // execstack_status_ is a three-state variable; update it based on
1122   // -z [no]execstack.
1123   if (this->execstack())
1124     this->set_execstack_status(EXECSTACK_YES);
1125   else if (this->noexecstack())
1126     this->set_execstack_status(EXECSTACK_NO);
1127
1128   // icf_status_ is a three-state variable; update it based on the
1129   // value of this->icf().
1130   if (strcmp(this->icf(), "none") == 0)
1131     this->set_icf_status(ICF_NONE);
1132   else if (strcmp(this->icf(), "safe") == 0)
1133     this->set_icf_status(ICF_SAFE);
1134   else
1135     this->set_icf_status(ICF_ALL);
1136
1137   // Handle the optional argument for --demangle.
1138   if (this->user_set_demangle())
1139     {
1140       this->set_do_demangle(true);
1141       const char* style = this->demangle();
1142       if (*style != '\0')
1143         {
1144           enum demangling_styles style_code;
1145
1146           style_code = cplus_demangle_name_to_style(style);
1147           if (style_code == unknown_demangling)
1148             gold_fatal("unknown demangling style '%s'", style);
1149           cplus_demangle_set_style(style_code);
1150         }
1151     }
1152   else if (this->user_set_no_demangle())
1153     this->set_do_demangle(false);
1154   else
1155     {
1156       // Testing COLLECT_NO_DEMANGLE makes our default demangling
1157       // behaviour identical to that of gcc's linker wrapper.
1158       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1159     }
1160
1161   // Parse the --orphan-handling argument.
1162   if (this->user_set_orphan_handling())
1163     {
1164       if (strcmp(this->orphan_handling(), "place") == 0)
1165         this->set_orphan_handling_enum(ORPHAN_PLACE);
1166       else if (strcmp(this->orphan_handling(), "discard") == 0)
1167         this->set_orphan_handling_enum(ORPHAN_DISCARD);
1168       else if (strcmp(this->orphan_handling(), "warn") == 0)
1169         this->set_orphan_handling_enum(ORPHAN_WARN);
1170       else if (strcmp(this->orphan_handling(), "error") == 0)
1171         this->set_orphan_handling_enum(ORPHAN_ERROR);
1172     }
1173
1174   // -M is equivalent to "-Map -".
1175   if (this->print_map() && !this->user_set_Map())
1176     {
1177       this->set_Map("-");
1178       this->set_user_set_Map();
1179     }
1180
1181   // Using -n or -N implies -static.
1182   if (this->nmagic() || this->omagic())
1183     this->set_static(true);
1184
1185   // If --thread_count is specified, it applies to
1186   // --thread-count-{initial,middle,final}, though it doesn't override
1187   // them.
1188   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1189     this->set_thread_count_initial(this->thread_count());
1190   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1191     this->set_thread_count_middle(this->thread_count());
1192   if (this->thread_count() > 0 && this->thread_count_final() == 0)
1193     this->set_thread_count_final(this->thread_count());
1194
1195   // Let's warn if you set the thread-count but we're going to ignore it.
1196 #ifndef ENABLE_THREADS
1197   if (this->threads())
1198     {
1199       gold_warning(_("ignoring --threads: "
1200                      "%s was compiled without thread support"),
1201                    program_name);
1202       this->set_threads(false);
1203     }
1204   if (this->thread_count() > 0 || this->thread_count_initial() > 0
1205       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1206     gold_warning(_("ignoring --thread-count: "
1207                    "%s was compiled without thread support"),
1208                  program_name);
1209 #endif
1210
1211   std::string libpath;
1212   if (this->user_set_Y())
1213     {
1214       libpath = this->Y();
1215       if (libpath.compare(0, 2, "P,") == 0)
1216         libpath.erase(0, 2);
1217     }
1218   else if (!this->nostdlib())
1219     {
1220 #ifndef NATIVE_LINKER
1221 #define NATIVE_LINKER 0
1222 #endif
1223       const char* p = LIB_PATH;
1224       if (strcmp(p, "::DEFAULT::") != 0)
1225         libpath = p;
1226       else if (NATIVE_LINKER
1227                || this->user_set_sysroot()
1228                || *TARGET_SYSTEM_ROOT != '\0')
1229         {
1230           this->add_to_library_path_with_sysroot("/lib");
1231           this->add_to_library_path_with_sysroot("/usr/lib");
1232         }
1233       else
1234         this->add_to_library_path_with_sysroot(TOOLLIBDIR);
1235     }
1236
1237   if (!libpath.empty())
1238     {
1239       size_t pos = 0;
1240       size_t next_pos;
1241       do
1242         {
1243           next_pos = libpath.find(':', pos);
1244           size_t len = (next_pos == std::string::npos
1245                         ? next_pos
1246                         : next_pos - pos);
1247           if (len != 0)
1248             this->add_to_library_path_with_sysroot(libpath.substr(pos, len));
1249           pos = next_pos + 1;
1250         }
1251       while (next_pos != std::string::npos);
1252     }
1253
1254   // Parse the contents of -retain-symbols-file into a set.
1255   if (this->retain_symbols_file())
1256     {
1257       std::ifstream in;
1258       in.open(this->retain_symbols_file());
1259       if (!in)
1260         gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1261                    this->retain_symbols_file(), strerror(errno));
1262       std::string line;
1263       std::getline(in, line);   // this chops off the trailing \n, if any
1264       while (in)
1265         {
1266           if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1267             line.resize(line.length() - 1);
1268           this->symbols_to_retain_.insert(line);
1269           std::getline(in, line);
1270         }
1271     }
1272
1273   // -Bgroup implies --unresolved-symbols=report-all.
1274   if (this->Bgroup() && !this->user_set_unresolved_symbols())
1275     this->set_unresolved_symbols("report-all");
1276
1277   // -shared implies --allow-shlib-undefined.  Currently
1278   // ---allow-shlib-undefined controls warnings issued based on the
1279   // -symbol table.  --unresolved-symbols controls warnings issued
1280   // -based on relocations.
1281   if (this->shared() && !this->user_set_allow_shlib_undefined())
1282     this->set_allow_shlib_undefined(true);
1283
1284   // Normalize library_path() by adding the sysroot to all directories
1285   // in the path, as appropriate.
1286   this->add_sysroot();
1287
1288   // Now that we've normalized the options, check for contradictory ones.
1289   if (this->shared() && this->is_static())
1290     gold_fatal(_("-shared and -static are incompatible"));
1291   if (this->shared() && this->pie())
1292     gold_fatal(_("-shared and -pie are incompatible"));
1293   if (this->pie() && this->is_static())
1294     gold_fatal(_("-pie and -static are incompatible"));
1295
1296   if (this->shared() && this->relocatable())
1297     gold_fatal(_("-shared and -r are incompatible"));
1298   if (this->pie() && this->relocatable())
1299     gold_fatal(_("-pie and -r are incompatible"));
1300
1301   if (!this->shared())
1302     {
1303       if (this->filter() != NULL)
1304         gold_fatal(_("-F/--filter may not used without -shared"));
1305       if (this->any_auxiliary())
1306         gold_fatal(_("-f/--auxiliary may not be used without -shared"));
1307     }
1308
1309   // TODO: implement support for -retain-symbols-file with -r, if needed.
1310   if (this->relocatable() && this->retain_symbols_file())
1311     gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1312
1313   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1314       && (this->shared()
1315           || this->pie()
1316           || this->relocatable()))
1317     gold_fatal(_("binary output format not compatible "
1318                  "with -shared or -pie or -r"));
1319
1320   if (this->user_set_hash_bucket_empty_fraction()
1321       && (this->hash_bucket_empty_fraction() < 0.0
1322           || this->hash_bucket_empty_fraction() >= 1.0))
1323     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1324                  "[0.0, 1.0)"),
1325                this->hash_bucket_empty_fraction());
1326
1327   if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1328     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1329                  "--incremental-unknown require the use of --incremental"));
1330
1331   // Check for options that are not compatible with incremental linking.
1332   // Where an option can be disabled without seriously changing the semantics
1333   // of the link, we turn the option off; otherwise, we issue a fatal error.
1334
1335   if (this->incremental_mode_ != INCREMENTAL_OFF)
1336     {
1337       if (this->relocatable())
1338         gold_fatal(_("incremental linking is not compatible with -r"));
1339       if (this->emit_relocs())
1340         gold_fatal(_("incremental linking is not compatible with "
1341                      "--emit-relocs"));
1342       if (this->has_plugins())
1343         gold_fatal(_("incremental linking is not compatible with --plugin"));
1344       if (this->relro())
1345         gold_fatal(_("incremental linking is not compatible with -z relro"));
1346       if (this->pie())
1347         gold_fatal(_("incremental linking is not compatible with -pie"));
1348       if (this->gc_sections())
1349         {
1350           gold_warning(_("ignoring --gc-sections for an incremental link"));
1351           this->set_gc_sections(false);
1352         }
1353       if (this->icf_enabled())
1354         {
1355           gold_warning(_("ignoring --icf for an incremental link"));
1356           this->set_icf_status(ICF_NONE);
1357         }
1358       if (strcmp(this->compress_debug_sections(), "none") != 0)
1359         {
1360           gold_warning(_("ignoring --compress-debug-sections for an "
1361                          "incremental link"));
1362           this->set_compress_debug_sections("none");
1363         }
1364     }
1365
1366   // --rosegment-gap implies --rosegment.
1367   if (this->user_set_rosegment_gap())
1368     this->set_rosegment(true);
1369
1370   // FIXME: we can/should be doing a lot more sanity checking here.
1371 }
1372
1373 // Search_directory methods.
1374
1375 // This is called if we have a sysroot.  Apply the sysroot if
1376 // appropriate.  Record whether the directory is in the sysroot.
1377
1378 void
1379 Search_directory::add_sysroot(const char* sysroot,
1380                               const char* canonical_sysroot)
1381 {
1382   gold_assert(*sysroot != '\0');
1383   if (this->put_in_sysroot_)
1384     {
1385       if (!IS_DIR_SEPARATOR(this->name_[0])
1386           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1387         this->name_ = '/' + this->name_;
1388       this->name_ = sysroot + this->name_;
1389       this->is_in_sysroot_ = true;
1390     }
1391   else
1392     {
1393       // Check whether this entry is in the sysroot.  To do this
1394       // correctly, we need to use canonical names.  Otherwise we will
1395       // get confused by the ../../.. paths that gcc tends to use.
1396       char* canonical_name = lrealpath(this->name_.c_str());
1397       int canonical_name_len = strlen(canonical_name);
1398       int canonical_sysroot_len = strlen(canonical_sysroot);
1399       if (canonical_name_len > canonical_sysroot_len
1400           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1401         {
1402           canonical_name[canonical_sysroot_len] = '\0';
1403           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1404             this->is_in_sysroot_ = true;
1405         }
1406       free(canonical_name);
1407     }
1408 }
1409
1410 // Input_arguments methods.
1411
1412 // Add a file to the list.
1413
1414 Input_argument&
1415 Input_arguments::add_file(Input_file_argument& file)
1416 {
1417   file.set_arg_serial(++this->file_count_);
1418   if (this->in_group_)
1419     {
1420       gold_assert(!this->input_argument_list_.empty());
1421       gold_assert(this->input_argument_list_.back().is_group());
1422       return this->input_argument_list_.back().group()->add_file(file);
1423     }
1424   if (this->in_lib_)
1425     {
1426       gold_assert(!this->input_argument_list_.empty());
1427       gold_assert(this->input_argument_list_.back().is_lib());
1428       return this->input_argument_list_.back().lib()->add_file(file);
1429     }
1430   this->input_argument_list_.push_back(Input_argument(file));
1431   return this->input_argument_list_.back();
1432 }
1433
1434 // Start a group.
1435
1436 void
1437 Input_arguments::start_group()
1438 {
1439   if (this->in_group_)
1440     gold_fatal(_("May not nest groups"));
1441   if (this->in_lib_)
1442     gold_fatal(_("may not nest groups in libraries"));
1443   Input_file_group* group = new Input_file_group();
1444   this->input_argument_list_.push_back(Input_argument(group));
1445   this->in_group_ = true;
1446 }
1447
1448 // End a group.
1449
1450 void
1451 Input_arguments::end_group()
1452 {
1453   if (!this->in_group_)
1454     gold_fatal(_("Group end without group start"));
1455   this->in_group_ = false;
1456 }
1457
1458 // Start a lib.
1459
1460 void
1461 Input_arguments::start_lib(const Position_dependent_options& options)
1462 {
1463   if (this->in_lib_)
1464     gold_fatal(_("may not nest libraries"));
1465   if (this->in_group_)
1466     gold_fatal(_("may not nest libraries in groups"));
1467   Input_file_lib* lib = new Input_file_lib(options);
1468   this->input_argument_list_.push_back(Input_argument(lib));
1469   this->in_lib_ = true;
1470 }
1471
1472 // End a lib.
1473
1474 void
1475 Input_arguments::end_lib()
1476 {
1477   if (!this->in_lib_)
1478     gold_fatal(_("lib end without lib start"));
1479   this->in_lib_ = false;
1480 }
1481
1482 // Command_line options.
1483
1484 Command_line::Command_line()
1485 {
1486 }
1487
1488 // Pre_options is the hook that sets the ready_to_register flag.
1489
1490 Command_line::Pre_options::Pre_options()
1491 {
1492   gold::options::ready_to_register = true;
1493 }
1494
1495 // Process the command line options.  For process_one_option, i is the
1496 // index of argv to process next, and must be an option (that is,
1497 // start with a dash).  The return value is the index of the next
1498 // option to process (i+1 or i+2, or argc to indicate processing is
1499 // done).  no_more_options is set to true if (and when) "--" is seen
1500 // as an option.
1501
1502 int
1503 Command_line::process_one_option(int argc, const char** argv, int i,
1504                                  bool* no_more_options)
1505 {
1506   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1507
1508   // If we are reading "--", then just set no_more_options and return.
1509   if (argv[i][1] == '-' && argv[i][2] == '\0')
1510     {
1511       *no_more_options = true;
1512       return i + 1;
1513     }
1514
1515   int new_i = i;
1516   options::One_option* option = NULL;
1517   const char* arg = NULL;
1518
1519   // First, try to process argv as a long option.
1520   option = parse_long_option(argc, argv, false, &arg, &new_i);
1521   if (option)
1522     {
1523       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1524       return new_i;
1525     }
1526
1527   // Now, try to process argv as a short option.  Since several short
1528   // options can be combined in one argv, we may have to parse a lot
1529   // until we're done reading this argv.
1530   int pos_in_argv_i = 1;
1531   while (new_i == i)
1532     {
1533       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1534       if (!option)
1535         break;
1536       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1537       ++pos_in_argv_i;
1538     }
1539   if (option)
1540     return new_i;
1541
1542   // I guess it's neither a long option nor a short option.
1543   usage(_("unknown option"), argv[i]);
1544   return argc;
1545 }
1546
1547
1548 void
1549 Command_line::process(int argc, const char** argv)
1550 {
1551   bool no_more_options = false;
1552   int i = 0;
1553   while (i < argc)
1554     {
1555       this->position_options_.copy_from_options(this->options());
1556       if (no_more_options || argv[i][0] != '-')
1557         {
1558           Input_file_argument file(argv[i],
1559                                    Input_file_argument::INPUT_FILE_TYPE_FILE,
1560                                    "", false, this->position_options_);
1561           this->inputs_.add_file(file);
1562           ++i;
1563         }
1564       else
1565         i = process_one_option(argc, argv, i, &no_more_options);
1566     }
1567
1568   if (this->inputs_.in_group())
1569     {
1570       fprintf(stderr, _("%s: missing group end\n"), program_name);
1571       usage();
1572     }
1573
1574   if (this->inputs_.in_lib())
1575     {
1576       fprintf(stderr, _("%s: missing lib end\n"), program_name);
1577       usage();
1578     }
1579
1580   // Normalize the options and ensure they don't contradict each other.
1581   this->options_.finalize();
1582 }
1583
1584 // Finalize the version script options and return them.
1585
1586 const Version_script_info&
1587 Command_line::version_script()
1588 {
1589   this->options_.finalize_dynamic_list();
1590   Version_script_info* vsi = this->script_options_.version_script_info();
1591   vsi->finalize();
1592   return *vsi;
1593 }
1594
1595 } // End namespace gold.