gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007 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 <iostream>
  26 #include <sys/stat.h>
  27 #include "filenames.h"
  28 #include "libiberty.h"
  29
  30 #include "options.h"
  31
  32 namespace gold
  33 {
  34
  35 // The information we keep for a single command line option.
  36
  37 struct options::One_option
  38 {
  39   // The single character option name, or '\0' if this is only a long
  40   // option.
  41   char short_option;
  42
  43   // The long option name, or NULL if this is only a short option.
  44   const char* long_option;
  45
  46   // Description of the option for --help output, or NULL if there is none.
  47   const char* doc;
  48
  49   // How to print the option name in --help output, or NULL to use the
  50   // default.
  51   const char* help_output;
  52
  53   // Long option dash control.  This is ignored if long_option is
  54   // NULL.
  55   enum
  56     {
  57       // Long option normally takes one dash; two dashes are also
  58       // accepted.
  59       ONE_DASH,
  60       // Long option normally takes two dashes; one dash is also
  61       // accepted.
  62       TWO_DASHES,
  63       // Long option always takes two dashes.
  64       EXACTLY_TWO_DASHES
  65     } dash;
  66
  67   // Function for special handling, or NULL.  Returns the number of
  68   // arguments to skip.  This will normally be at least 1, but it may
  69   // be 0 if this function changes *argv.  ARG points to the location
  70   // in *ARGV where the option starts, which may be helpful for a
  71   // short option.
  72   int (*special)(int argc, char** argv, char *arg, Command_line*);
  73
  74   // If this is a position independent option which does not take an
  75   // argument, this is the member function to call to record it.
  76   void (General_options::*general_noarg)();
  77
  78   // If this is a position independent function which takes an
  79   // argument, this is the member function to call to record it.
  80   void (General_options::*general_arg)(const char*);
  81
  82   // If this is a position dependent option which does not take an
  83   // argument, this is the member function to call to record it.
  84   void (Position_dependent_options::*dependent_noarg)();
  85
  86   // If this is a position dependent option which takes an argument,
  87   // this is the member function to record it.
  88   void (Position_dependent_options::*dependent_arg)(const char*);
  89
  90   // Return whether this option takes an argument.
  91   bool
  92   takes_argument() const
  93   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  94 };
  95
  96 class options::Command_line_options
  97 {
  98  public:
  99   static const One_option options[];
 100   static const int options_size;
 101 };
 102
 103 } // End namespace gold.
 104
 105 namespace
 106 {
 107
 108 // Handle the special -l option, which adds an input file.
 109
 110 int
 111 library(int argc, char** argv, char* arg, gold::Command_line* cmdline)
 112 {
 113   return cmdline->process_l_option(argc, argv, arg);
 114 }
 115
 116 // Handle the special --start-group option.
 117
 118 int
 119 start_group(int, char**, char* arg, gold::Command_line* cmdline)
 120 {
 121   cmdline->start_group(arg);
 122   return 1;
 123 }
 124
 125 // Handle the special --end-group option.
 126
 127 int
 128 end_group(int, char**, char* arg, gold::Command_line* cmdline)
 129 {
 130   cmdline->end_group(arg);
 131   return 1;
 132 }
 133
 134 // Report usage information for ld --help, and exit.
 135
 136 int
 137 help(int, char**, char*, gold::Command_line*)
 138 {
 139   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 140
 141   const int options_size = gold::options::Command_line_options::options_size;
 142   const gold::options::One_option* options =
 143     gold::options::Command_line_options::options;
 144   for (int i = 0; i < options_size; ++i)
 145     {
 146       if (options[i].doc == NULL)
 147         continue;
 148
 149       printf("  ");
 150       int len = 2;
 151       bool comma = false;
 152
 153       int j = i;
 154       do
 155         {
 156           if (options[j].help_output != NULL)
 157             {
 158               if (comma)
 159                 {
 160                   printf(", ");
 161                   len += 2;
 162                 }
 163               printf(options[j].help_output);
 164               len += std::strlen(options[i].help_output);
 165               comma = true;
 166             }
 167           else
 168             {
 169               if (options[j].short_option != '\0')
 170                 {
 171                   if (comma)
 172                     {
 173                       printf(", ");
 174                       len += 2;
 175                     }
 176                   printf("-%c", options[j].short_option);
 177                   len += 2;
 178                   comma = true;
 179                 }
 180
 181               if (options[j].long_option != NULL)
 182                 {
 183                   if (comma)
 184                     {
 185                       printf(", ");
 186                       len += 2;
 187                     }
 188                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 189                     {
 190                       printf("-");
 191                       ++len;
 192                     }
 193                   else
 194                     {
 195                       printf("--");
 196                       len += 2;
 197                     }
 198                   printf("%s", options[j].long_option);
 199                   len += std::strlen(options[j].long_option);
 200                   comma = true;
 201                 }
 202             }
 203           ++j;
 204         }
 205       while (j < options_size && options[j].doc == NULL);
 206
 207       if (len >= 30)
 208         {
 209           printf("\n");
 210           len = 0;
 211         }
 212       for (; len < 30; ++len)
 213         std::putchar(' ');
 214
 215       std::puts(options[i].doc);
 216     }
 217
 218   ::exit(0);
 219
 220   return 0;
 221 }
 222
 223 // Report version information.
 224
 225 int
 226 version(int, char**, char* opt, gold::Command_line*)
 227 {
 228   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 229   ::exit(0);
 230   return 0;
 231 }
 232
 233 // If the default sysroot is relocatable, try relocating it based on
 234 // the prefix FROM.
 235
 236 char*
 237 get_relative_sysroot(const char* from)
 238 {
 239   char* path = make_relative_prefix(gold::program_name, from,
 240                                     TARGET_SYSTEM_ROOT);
 241   if (path != NULL)
 242     {
 243       struct stat s;
 244       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 245         return path;
 246       free(path);
 247     }
 248
 249   return NULL;
 250 }
 251
 252 // Return the default sysroot.  This is set by the --with-sysroot
 253 // option to configure.
 254
 255 std::string
 256 get_default_sysroot()
 257 {
 258   const char* sysroot = TARGET_SYSTEM_ROOT;
 259   if (*sysroot == '\0')
 260     return "";
 261
 262   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 263     {
 264       char* path = get_relative_sysroot (BINDIR);
 265       if (path == NULL)
 266         path = get_relative_sysroot (TOOLBINDIR);
 267       if (path != NULL)
 268         {
 269           std::string ret = path;
 270           free(path);
 271           return ret;
 272         }
 273     }
 274
 275   return sysroot;
 276 }
 277
 278 } // End anonymous namespace.
 279
 280 namespace gold
 281 {
 282
 283 // Helper macros used to specify the options.  We could also do this
 284 // using constructors, but then g++ would generate code to initialize
 285 // the array.  We want the array to be initialized statically so that
 286 // we get better startup time.
 287
 288 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 289   { short_option, long_option, doc, help, options::One_option::dash, \
 290       NULL, func, NULL, NULL, NULL }
 291 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 292   { short_option, long_option, doc, help, options::One_option::dash, \
 293       NULL, NULL, func, NULL, NULL }
 294 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 295   { short_option, long_option, doc, help, options::One_option::dash, \
 296       NULL,  NULL, NULL, func, NULL }
 297 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 298   { short_option, long_option, doc, help, options::One_option::dash, \
 299       NULL, NULL, NULL, NULL, func }
 300 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 301   { short_option, long_option, doc, help, options::One_option::dash, \
 302       func, NULL, NULL, NULL, NULL }
 303
 304 // Here is the actual list of options which we accept.
 305
 306 const options::One_option
 307 options::Command_line_options::options[] =
 308 {
 309   POSDEP_NOARG('\0', "as-needed",
 310                N_("Only set DT_NEEDED for dynamic libs if used"),
 311                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 312   POSDEP_NOARG('\0', "no-as-needed",
 313                N_("Always DT_NEEDED for dynamic libs (default)"),
 314                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 315   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 316                 NULL, ONE_DASH, &General_options::set_symbolic),
 317   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 318                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 319   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 320                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 321   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 322               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 323               &General_options::set_dynamic_linker),
 324   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 325           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 326           &library),
 327   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 328               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 329               &General_options::add_to_search_path),
 330   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 331               &General_options::ignore),
 332   GENERAL_ARG('o', "output", N_("Set output file name"),
 333               N_("-o FILE, --output FILE"), TWO_DASHES,
 334               &General_options::set_output_file_name),
 335   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 336               N_("-O level"), ONE_DASH,
 337               &General_options::set_optimization_level),
 338   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 339                 ONE_DASH, &General_options::set_relocatable),
 340   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 341               N_("-R DIR, -rpath DIR"), ONE_DASH,
 342               &General_options::add_to_rpath),
 343   GENERAL_ARG('\0', "rpath-link",
 344               N_("Add DIR to link time shared library search path"),
 345               N_("--rpath-link DIR"), TWO_DASHES,
 346               &General_options::add_to_rpath_link),
 347   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 348                 TWO_DASHES, &General_options::set_strip_all),
 349   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 350                 TWO_DASHES, &General_options::set_strip_debug),
 351   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 352                 NULL, ONE_DASH, &General_options::set_shared),
 353   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 354                 NULL, ONE_DASH, &General_options::set_static),
 355   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 356                 NULL, TWO_DASHES, &General_options::set_stats),
 357   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 358               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 359   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 360               N_("-Ttext ADDRESS"), ONE_DASH,
 361               &General_options::set_text_segment_address),
 362   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 363                 NULL, TWO_DASHES, &General_options::set_threads),
 364   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 365                 NULL, TWO_DASHES, &General_options::clear_threads),
 366   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 367               N_("--thread-count COUNT"), TWO_DASHES,
 368               &General_options::set_thread_count),
 369   GENERAL_ARG('\0', "thread-count-initial",
 370               N_("Number of threads to use in initial pass"),
 371               N_("--thread-count-initial COUNT"), TWO_DASHES,
 372               &General_options::set_thread_count_initial),
 373   GENERAL_ARG('\0', "thread-count-middle",
 374               N_("Number of threads to use in middle pass"),
 375               N_("--thread-count-middle COUNT"), TWO_DASHES,
 376               &General_options::set_thread_count_middle),
 377   GENERAL_ARG('\0', "thread-count-final",
 378               N_("Number of threads to use in final pass"),
 379               N_("--thread-count-final COUNT"), TWO_DASHES,
 380               &General_options::set_thread_count_final),
 381   POSDEP_NOARG('\0', "whole-archive",
 382                N_("Include all archive contents"),
 383                NULL, TWO_DASHES,
 384                &Position_dependent_options::set_whole_archive),
 385   POSDEP_NOARG('\0', "no-whole-archive",
 386                N_("Include only needed archive contents"),
 387                NULL, TWO_DASHES,
 388                &Position_dependent_options::clear_whole_archive),
 389   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 390           TWO_DASHES, &start_group),
 391   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 392           TWO_DASHES, &end_group),
 393   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 394           TWO_DASHES, &help),
 395   SPECIAL('v', "version", N_("Report version information"), NULL,
 396           TWO_DASHES, &version)
 397 };
 398
 399 const int options::Command_line_options::options_size =
 400   sizeof (options) / sizeof (options[0]);
 401
 402 // The default values for the general options.
 403
 404 General_options::General_options()
 405   : export_dynamic_(false),
 406     dynamic_linker_(NULL),
 407     search_path_(),
 408     optimization_level_(0),
 409     output_file_name_("a.out"),
 410     is_relocatable_(false),
 411     strip_(STRIP_NONE),
 412     symbolic_(false),
 413     create_eh_frame_hdr_(false),
 414     rpath_(),
 415     rpath_link_(),
 416     is_shared_(false),
 417     is_static_(false),
 418     print_stats_(false),
 419     sysroot_(),
 420     text_segment_address_(-1U),   // -1 indicates value not set by user
 421     threads_(false),
 422     thread_count_initial_(0),
 423     thread_count_middle_(0),
 424     thread_count_final_(0)
 425 {
 426 }
 427
 428 // The default values for the position dependent options.
 429
 430 Position_dependent_options::Position_dependent_options()
 431   : do_static_search_(false),
 432     as_needed_(false),
 433     include_whole_archive_(false)
 434 {
 435 }
 436
 437 // Add the sysroot, if any, to the search paths.
 438
 439 void
 440 General_options::add_sysroot()
 441 {
 442   if (this->sysroot_.empty())
 443     {
 444       this->sysroot_ = get_default_sysroot();
 445       if (this->sysroot_.empty())
 446         return;
 447     }
 448
 449   const char* sysroot = this->sysroot_.c_str();
 450   char* canonical_sysroot = lrealpath(sysroot);
 451
 452   for (Dir_list::iterator p = this->search_path_.begin();
 453        p != this->search_path_.end();
 454        ++p)
 455     p->add_sysroot(sysroot, canonical_sysroot);
 456
 457   free(canonical_sysroot);
 458 }
 459
 460 // Search_directory methods.
 461
 462 // This is called if we have a sysroot.  Apply the sysroot if
 463 // appropriate.  Record whether the directory is in the sysroot.
 464
 465 void
 466 Search_directory::add_sysroot(const char* sysroot,
 467                               const char* canonical_sysroot)
 468 {
 469   gold_assert(*sysroot != '\0');
 470   if (this->put_in_sysroot_)
 471     {
 472       if (!IS_DIR_SEPARATOR(this->name_[0])
 473           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 474         this->name_ = '/' + this->name_;
 475       this->name_ = sysroot + this->name_;
 476       this->is_in_sysroot_ = true;
 477     }
 478   else
 479     {
 480       // Check whether this entry is in the sysroot.  To do this
 481       // correctly, we need to use canonical names.  Otherwise we will
 482       // get confused by the ../../.. paths that gcc tends to use.
 483       char* canonical_name = lrealpath(this->name_.c_str());
 484       int canonical_name_len = strlen(canonical_name);
 485       int canonical_sysroot_len = strlen(canonical_sysroot);
 486       if (canonical_name_len > canonical_sysroot_len
 487           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 488         {
 489           canonical_name[canonical_sysroot_len] = '\0';
 490           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 491             this->is_in_sysroot_ = true;
 492         }
 493       free(canonical_name);
 494     }
 495 }
 496
 497 // Input_arguments methods.
 498
 499 // Add a file to the list.
 500
 501 void
 502 Input_arguments::add_file(const Input_file_argument& file)
 503 {
 504   if (!this->in_group_)
 505     this->input_argument_list_.push_back(Input_argument(file));
 506   else
 507     {
 508       gold_assert(!this->input_argument_list_.empty());
 509       gold_assert(this->input_argument_list_.back().is_group());
 510       this->input_argument_list_.back().group()->add_file(file);
 511     }
 512 }
 513
 514 // Start a group.
 515
 516 void
 517 Input_arguments::start_group()
 518 {
 519   gold_assert(!this->in_group_);
 520   Input_file_group* group = new Input_file_group();
 521   this->input_argument_list_.push_back(Input_argument(group));
 522   this->in_group_ = true;
 523 }
 524
 525 // End a group.
 526
 527 void
 528 Input_arguments::end_group()
 529 {
 530   gold_assert(this->in_group_);
 531   this->in_group_ = false;
 532 }
 533
 534 // Command_line options.
 535
 536 Command_line::Command_line()
 537   : options_(), position_options_(), inputs_()
 538 {
 539 }
 540
 541 // Process the command line options.
 542
 543 void
 544 Command_line::process(int argc, char** argv)
 545 {
 546   const int options_size = options::Command_line_options::options_size;
 547   const options::One_option* options =
 548     options::Command_line_options::options;
 549   bool no_more_options = false;
 550   int i = 0;
 551   while (i < argc)
 552     {
 553       if (argv[i][0] != '-' || no_more_options)
 554         {
 555           this->add_file(argv[i], false);
 556           ++i;
 557           continue;
 558         }
 559
 560       // Option starting with '-'.
 561       int dashes = 1;
 562       if (argv[i][1] == '-')
 563         {
 564           dashes = 2;
 565           if (argv[i][2] == '\0')
 566             {
 567               no_more_options = true;
 568               continue;
 569             }
 570         }
 571
 572       // Look for a long option match.
 573       char* opt = argv[i] + dashes;
 574       char first = opt[0];
 575       int skiparg = 0;
 576       char* arg = strchr(opt, '=');
 577       bool argument_with_equals = arg != NULL;
 578       if (arg != NULL)
 579         {
 580           *arg = '\0';
 581           ++arg;
 582         }
 583       else if (i + 1 < argc)
 584         {
 585           arg = argv[i + 1];
 586           skiparg = 1;
 587         }
 588
 589       int j;
 590       for (j = 0; j < options_size; ++j)
 591         {
 592           if (options[j].long_option != NULL
 593               && (dashes == 2
 594                   || (options[j].dash
 595                       != options::One_option::EXACTLY_TWO_DASHES))
 596               && first == options[j].long_option[0]
 597               && strcmp(opt, options[j].long_option) == 0)
 598             {
 599               if (options[j].special)
 600                 i += options[j].special(argc - 1, argv + i, opt, this);
 601               else
 602                 {
 603                   if (!options[j].takes_argument())
 604                     {
 605                       if (argument_with_equals)
 606                         this->usage(_("unexpected argument"), argv[i]);
 607                       arg = NULL;
 608                       skiparg = 0;
 609                     }
 610                   else
 611                     {
 612                       if (arg == NULL)
 613                         this->usage(_("missing argument"), argv[i]);
 614                     }
 615                   this->apply_option(options[j], arg);
 616                   i += skiparg + 1;
 617                 }
 618               break;
 619             }
 620         }
 621       if (j < options_size)
 622         continue;
 623
 624       // If we saw two dashes, we need to see a long option.
 625       if (dashes == 2)
 626         this->usage(_("unknown option"), argv[i]);
 627
 628       // Look for a short option match.  There may be more than one
 629       // short option in a given argument.
 630       bool done = false;
 631       char* s = argv[i] + 1;
 632       ++i;
 633       while (*s != '\0' && !done)
 634         {
 635           char opt = *s;
 636           int j;
 637           for (j = 0; j < options_size; ++j)
 638             {
 639               if (options[j].short_option == opt)
 640                 {
 641                   if (options[j].special)
 642                     {
 643                       // Undo the argument skip done above.
 644                       --i;
 645                       i += options[j].special(argc - i, argv + i, s, this);
 646                       done = true;
 647                     }
 648                   else
 649                     {
 650                       arg = NULL;
 651                       if (options[j].takes_argument())
 652                         {
 653                           if (s[1] != '\0')
 654                             {
 655                               arg = s + 1;
 656                               done = true;
 657                             }
 658                           else if (i < argc)
 659                             {
 660                               arg = argv[i];
 661                               ++i;
 662                             }
 663                           else
 664                             this->usage(_("missing argument"), opt);
 665                         }
 666                       this->apply_option(options[j], arg);
 667                     }
 668                   break;
 669                 }
 670             }
 671
 672           if (j >= options_size)
 673             this->usage(_("unknown option"), *s);
 674
 675           ++s;
 676         }
 677     }
 678
 679   if (this->inputs_.in_group())
 680     {
 681       fprintf(stderr, _("%s: missing group end"), program_name);
 682       this->usage();
 683     }
 684
 685   // FIXME: We should only do this when configured in native mode.
 686   this->options_.add_to_search_path_with_sysroot("/lib");
 687   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 688
 689   this->options_.add_sysroot();
 690
 691   // Ensure options don't contradict each other and are otherwise kosher.
 692   this->normalize_options();
 693 }
 694
 695 // Ensure options don't contradict each other and are otherwise kosher.
 696
 697 void
 698 Command_line::normalize_options()
 699 {
 700   // If the user specifies both -s and -r, convert the -s as -S.
 701   // -r requires us to keep externally visible symbols!
 702   if (this->options_.strip_all() && this->options_.is_relocatable())
 703     {
 704       // Clears the strip_all() status, replacing it with strip_debug().
 705       this->options_.set_strip_debug();
 706     }
 707
 708   // FIXME: we can/should be doing a lot more sanity checking here.
 709 }
 710
 711
 712 // Apply a command line option.
 713
 714 void
 715 Command_line::apply_option(const options::One_option& opt,
 716                            const char* arg)
 717 {
 718   if (arg == NULL)
 719     {
 720       if (opt.general_noarg)
 721         (this->options_.*(opt.general_noarg))();
 722       else if (opt.dependent_noarg)
 723         (this->position_options_.*(opt.dependent_noarg))();
 724       else
 725         gold_unreachable();
 726     }
 727   else
 728     {
 729       if (opt.general_arg)
 730         (this->options_.*(opt.general_arg))(arg);
 731       else if (opt.dependent_arg)
 732         (this->position_options_.*(opt.dependent_arg))(arg);
 733       else
 734         gold_unreachable();
 735     }
 736 }
 737
 738 // Add an input file or library.
 739
 740 void
 741 Command_line::add_file(const char* name, bool is_lib)
 742 {
 743   Input_file_argument file(name, is_lib, "", this->position_options_);
 744   this->inputs_.add_file(file);
 745 }
 746
 747 // Handle the -l option, which requires special treatment.
 748
 749 int
 750 Command_line::process_l_option(int argc, char** argv, char* arg)
 751 {
 752   int ret;
 753   const char* libname;
 754   if (arg[1] != '\0')
 755     {
 756       ret = 1;
 757       libname = arg + 1;
 758     }
 759   else if (argc > 1)
 760     {
 761       ret = 2;
 762       libname = argv[argc + 1];
 763     }
 764   else
 765     this->usage(_("missing argument"), arg);
 766
 767   this->add_file(libname, true);
 768
 769   return ret;
 770 }
 771
 772 // Handle the --start-group option.
 773
 774 void
 775 Command_line::start_group(const char* arg)
 776 {
 777   if (this->inputs_.in_group())
 778     this->usage(_("may not nest groups"), arg);
 779   this->inputs_.start_group();
 780 }
 781
 782 // Handle the --end-group option.
 783
 784 void
 785 Command_line::end_group(const char* arg)
 786 {
 787   if (!this->inputs_.in_group())
 788     this->usage(_("group end without group start"), arg);
 789   this->inputs_.end_group();
 790 }
 791
 792 // Report a usage error.  */
 793
 794 void
 795 Command_line::usage()
 796 {
 797   fprintf(stderr,
 798           _("%s: use the --help option for usage information\n"),
 799           program_name);
 800   ::exit(1);
 801 }
 802
 803 void
 804 Command_line::usage(const char* msg, const char *opt)
 805 {
 806   fprintf(stderr,
 807           _("%s: %s: %s\n"),
 808           program_name, opt, msg);
 809   this->usage();
 810 }
 811
 812 void
 813 Command_line::usage(const char* msg, char opt)
 814 {
 815   fprintf(stderr,
 816           _("%s: -%c: %s\n"),
 817           program_name, opt, msg);
 818   this->usage();
 819 }
 820
 821 } // End namespace gold.