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 // We have a separate table for -z options.
  97
  98 struct options::One_z_option
  99 {
 100   // The name of the option.
 101   const char* name;
 102
 103   // The member function in General_options called to record it.
 104   void (General_options::*set)();
 105 };
 106
 107 class options::Command_line_options
 108 {
 109  public:
 110   static const One_option options[];
 111   static const int options_size;
 112   static const One_z_option z_options[];
 113   static const int z_options_size;
 114 };
 115
 116 } // End namespace gold.
 117
 118 namespace
 119 {
 120
 121 // Handle the special -l option, which adds an input file.
 122
 123 int
 124 library(int argc, char** argv, char* arg, gold::Command_line* cmdline)
 125 {
 126   return cmdline->process_l_option(argc, argv, arg);
 127 }
 128
 129 // Handle the special --start-group option.
 130
 131 int
 132 start_group(int, char**, char* arg, gold::Command_line* cmdline)
 133 {
 134   cmdline->start_group(arg);
 135   return 1;
 136 }
 137
 138 // Handle the special --end-group option.
 139
 140 int
 141 end_group(int, char**, char* arg, gold::Command_line* cmdline)
 142 {
 143   cmdline->end_group(arg);
 144   return 1;
 145 }
 146
 147 // Report usage information for ld --help, and exit.
 148
 149 int
 150 help(int, char**, char*, gold::Command_line*)
 151 {
 152   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 153
 154   const int options_size = gold::options::Command_line_options::options_size;
 155   const gold::options::One_option* options =
 156     gold::options::Command_line_options::options;
 157   for (int i = 0; i < options_size; ++i)
 158     {
 159       if (options[i].doc == NULL)
 160         continue;
 161
 162       printf("  ");
 163       int len = 2;
 164       bool comma = false;
 165
 166       int j = i;
 167       do
 168         {
 169           if (options[j].help_output != NULL)
 170             {
 171               if (comma)
 172                 {
 173                   printf(", ");
 174                   len += 2;
 175                 }
 176               printf(options[j].help_output);
 177               len += std::strlen(options[i].help_output);
 178               comma = true;
 179             }
 180           else
 181             {
 182               if (options[j].short_option != '\0')
 183                 {
 184                   if (comma)
 185                     {
 186                       printf(", ");
 187                       len += 2;
 188                     }
 189                   printf("-%c", options[j].short_option);
 190                   len += 2;
 191                   comma = true;
 192                 }
 193
 194               if (options[j].long_option != NULL)
 195                 {
 196                   if (comma)
 197                     {
 198                       printf(", ");
 199                       len += 2;
 200                     }
 201                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 202                     {
 203                       printf("-");
 204                       ++len;
 205                     }
 206                   else
 207                     {
 208                       printf("--");
 209                       len += 2;
 210                     }
 211                   printf("%s", options[j].long_option);
 212                   len += std::strlen(options[j].long_option);
 213                   comma = true;
 214                 }
 215             }
 216           ++j;
 217         }
 218       while (j < options_size && options[j].doc == NULL);
 219
 220       if (len >= 30)
 221         {
 222           printf("\n");
 223           len = 0;
 224         }
 225       for (; len < 30; ++len)
 226         std::putchar(' ');
 227
 228       std::puts(options[i].doc);
 229     }
 230
 231   ::exit(0);
 232
 233   return 0;
 234 }
 235
 236 // Report version information.
 237
 238 int
 239 version(int, char**, char* opt, gold::Command_line*)
 240 {
 241   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 242   ::exit(0);
 243   return 0;
 244 }
 245
 246 // If the default sysroot is relocatable, try relocating it based on
 247 // the prefix FROM.
 248
 249 char*
 250 get_relative_sysroot(const char* from)
 251 {
 252   char* path = make_relative_prefix(gold::program_name, from,
 253                                     TARGET_SYSTEM_ROOT);
 254   if (path != NULL)
 255     {
 256       struct stat s;
 257       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 258         return path;
 259       free(path);
 260     }
 261
 262   return NULL;
 263 }
 264
 265 // Return the default sysroot.  This is set by the --with-sysroot
 266 // option to configure.
 267
 268 std::string
 269 get_default_sysroot()
 270 {
 271   const char* sysroot = TARGET_SYSTEM_ROOT;
 272   if (*sysroot == '\0')
 273     return "";
 274
 275   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 276     {
 277       char* path = get_relative_sysroot (BINDIR);
 278       if (path == NULL)
 279         path = get_relative_sysroot (TOOLBINDIR);
 280       if (path != NULL)
 281         {
 282           std::string ret = path;
 283           free(path);
 284           return ret;
 285         }
 286     }
 287
 288   return sysroot;
 289 }
 290
 291 } // End anonymous namespace.
 292
 293 namespace gold
 294 {
 295
 296 // Helper macros used to specify the options.  We could also do this
 297 // using constructors, but then g++ would generate code to initialize
 298 // the array.  We want the array to be initialized statically so that
 299 // we get better startup time.
 300
 301 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 302   { short_option, long_option, doc, help, options::One_option::dash, \
 303       NULL, func, NULL, NULL, NULL }
 304 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 305   { short_option, long_option, doc, help, options::One_option::dash, \
 306       NULL, NULL, func, NULL, NULL }
 307 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 308   { short_option, long_option, doc, help, options::One_option::dash, \
 309       NULL,  NULL, NULL, func, NULL }
 310 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 311   { short_option, long_option, doc, help, options::One_option::dash, \
 312       NULL, NULL, NULL, NULL, func }
 313 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 314   { short_option, long_option, doc, help, options::One_option::dash, \
 315       func, NULL, NULL, NULL, NULL }
 316
 317 // Here is the actual list of options which we accept.
 318
 319 const options::One_option
 320 options::Command_line_options::options[] =
 321 {
 322   POSDEP_NOARG('\0', "as-needed",
 323                N_("Only set DT_NEEDED for dynamic libs if used"),
 324                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 325   POSDEP_NOARG('\0', "no-as-needed",
 326                N_("Always DT_NEEDED for dynamic libs (default)"),
 327                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 328   POSDEP_NOARG('\0', "Bdynamic",
 329                N_("-l searches for shared libraries"),
 330                NULL, ONE_DASH,
 331                &Position_dependent_options::set_dynamic_search),
 332   POSDEP_NOARG('\0', "Bstatic",
 333                N_("-l does not search for shared libraries"),
 334                NULL, ONE_DASH,
 335                &Position_dependent_options::set_static_search),
 336   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 337                 NULL, ONE_DASH, &General_options::set_symbolic),
 338   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 339                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 340   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 341                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 342   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 343               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 344               &General_options::set_dynamic_linker),
 345   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 346           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 347           &library),
 348   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 349               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 350               &General_options::add_to_search_path),
 351   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 352               &General_options::ignore),
 353   GENERAL_ARG('o', "output", N_("Set output file name"),
 354               N_("-o FILE, --output FILE"), TWO_DASHES,
 355               &General_options::set_output_file_name),
 356   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 357               N_("-O level"), ONE_DASH,
 358               &General_options::set_optimization_level),
 359   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 360                 ONE_DASH, &General_options::set_relocatable),
 361   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 362               N_("-R DIR, -rpath DIR"), ONE_DASH,
 363               &General_options::add_to_rpath),
 364   GENERAL_ARG('\0', "rpath-link",
 365               N_("Add DIR to link time shared library search path"),
 366               N_("--rpath-link DIR"), TWO_DASHES,
 367               &General_options::add_to_rpath_link),
 368   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 369                 TWO_DASHES, &General_options::set_strip_all),
 370   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 371                 TWO_DASHES, &General_options::set_strip_debug),
 372   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 373                 NULL, ONE_DASH, &General_options::set_shared),
 374   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 375                 NULL, ONE_DASH, &General_options::set_static),
 376   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 377                 NULL, TWO_DASHES, &General_options::set_stats),
 378   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 379               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 380   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 381               N_("-Ttext ADDRESS"), ONE_DASH,
 382               &General_options::set_text_segment_address),
 383   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 384                 NULL, TWO_DASHES, &General_options::set_threads),
 385   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 386                 NULL, TWO_DASHES, &General_options::clear_threads),
 387   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 388               N_("--thread-count COUNT"), TWO_DASHES,
 389               &General_options::set_thread_count),
 390   GENERAL_ARG('\0', "thread-count-initial",
 391               N_("Number of threads to use in initial pass"),
 392               N_("--thread-count-initial COUNT"), TWO_DASHES,
 393               &General_options::set_thread_count_initial),
 394   GENERAL_ARG('\0', "thread-count-middle",
 395               N_("Number of threads to use in middle pass"),
 396               N_("--thread-count-middle COUNT"), TWO_DASHES,
 397               &General_options::set_thread_count_middle),
 398   GENERAL_ARG('\0', "thread-count-final",
 399               N_("Number of threads to use in final pass"),
 400               N_("--thread-count-final COUNT"), TWO_DASHES,
 401               &General_options::set_thread_count_final),
 402   POSDEP_NOARG('\0', "whole-archive",
 403                N_("Include all archive contents"),
 404                NULL, TWO_DASHES,
 405                &Position_dependent_options::set_whole_archive),
 406   POSDEP_NOARG('\0', "no-whole-archive",
 407                N_("Include only needed archive contents"),
 408                NULL, TWO_DASHES,
 409                &Position_dependent_options::clear_whole_archive),
 410
 411   GENERAL_ARG('z', NULL,
 412               N_("Subcommands as follows:\n\
 413     -z execstack              Mark output as requiring executable stack\n\
 414     -z noexecstack            Mark output as not requiring executable stack"),
 415               N_("-z SUBCOMMAND"), ONE_DASH,
 416               &General_options::handle_z_option),
 417
 418   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 419           TWO_DASHES, &start_group),
 420   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 421           TWO_DASHES, &end_group),
 422   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 423           TWO_DASHES, &help),
 424   SPECIAL('v', "version", N_("Report version information"), NULL,
 425           TWO_DASHES, &version)
 426 };
 427
 428 const int options::Command_line_options::options_size =
 429   sizeof (options) / sizeof (options[0]);
 430
 431 // The -z options.
 432
 433 const options::One_z_option
 434 options::Command_line_options::z_options[] =
 435 {
 436   { "execstack", &General_options::set_execstack },
 437   { "noexecstack", &General_options::set_noexecstack },
 438 };
 439
 440 const int options::Command_line_options::z_options_size =
 441   sizeof(z_options) / sizeof(z_options[0]);
 442
 443 // The default values for the general options.
 444
 445 General_options::General_options()
 446   : export_dynamic_(false),
 447     dynamic_linker_(NULL),
 448     search_path_(),
 449     optimization_level_(0),
 450     output_file_name_("a.out"),
 451     is_relocatable_(false),
 452     strip_(STRIP_NONE),
 453     symbolic_(false),
 454     create_eh_frame_hdr_(false),
 455     rpath_(),
 456     rpath_link_(),
 457     is_shared_(false),
 458     is_static_(false),
 459     print_stats_(false),
 460     sysroot_(),
 461     text_segment_address_(-1U),   // -1 indicates value not set by user
 462     threads_(false),
 463     thread_count_initial_(0),
 464     thread_count_middle_(0),
 465     thread_count_final_(0),
 466     execstack_(EXECSTACK_FROM_INPUT)
 467 {
 468 }
 469
 470 // The default values for the position dependent options.
 471
 472 Position_dependent_options::Position_dependent_options()
 473   : do_static_search_(false),
 474     as_needed_(false),
 475     include_whole_archive_(false)
 476 {
 477 }
 478
 479 // Handle the -z option.
 480
 481 void
 482 General_options::handle_z_option(const char* arg)
 483 {
 484   const int z_options_size = options::Command_line_options::z_options_size;
 485   const gold::options::One_z_option* z_options =
 486     gold::options::Command_line_options::z_options;
 487   for (int i = 0; i < z_options_size; ++i)
 488     {
 489       if (strcmp(arg, z_options[i].name) == 0)
 490         {
 491           (this->*(z_options[i].set))();
 492           return;
 493         }
 494     }
 495
 496   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 497           program_name, arg);
 498   ::exit(1);
 499 }
 500
 501 // Add the sysroot, if any, to the search paths.
 502
 503 void
 504 General_options::add_sysroot()
 505 {
 506   if (this->sysroot_.empty())
 507     {
 508       this->sysroot_ = get_default_sysroot();
 509       if (this->sysroot_.empty())
 510         return;
 511     }
 512
 513   const char* sysroot = this->sysroot_.c_str();
 514   char* canonical_sysroot = lrealpath(sysroot);
 515
 516   for (Dir_list::iterator p = this->search_path_.begin();
 517        p != this->search_path_.end();
 518        ++p)
 519     p->add_sysroot(sysroot, canonical_sysroot);
 520
 521   free(canonical_sysroot);
 522 }
 523
 524 // Search_directory methods.
 525
 526 // This is called if we have a sysroot.  Apply the sysroot if
 527 // appropriate.  Record whether the directory is in the sysroot.
 528
 529 void
 530 Search_directory::add_sysroot(const char* sysroot,
 531                               const char* canonical_sysroot)
 532 {
 533   gold_assert(*sysroot != '\0');
 534   if (this->put_in_sysroot_)
 535     {
 536       if (!IS_DIR_SEPARATOR(this->name_[0])
 537           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 538         this->name_ = '/' + this->name_;
 539       this->name_ = sysroot + this->name_;
 540       this->is_in_sysroot_ = true;
 541     }
 542   else
 543     {
 544       // Check whether this entry is in the sysroot.  To do this
 545       // correctly, we need to use canonical names.  Otherwise we will
 546       // get confused by the ../../.. paths that gcc tends to use.
 547       char* canonical_name = lrealpath(this->name_.c_str());
 548       int canonical_name_len = strlen(canonical_name);
 549       int canonical_sysroot_len = strlen(canonical_sysroot);
 550       if (canonical_name_len > canonical_sysroot_len
 551           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 552         {
 553           canonical_name[canonical_sysroot_len] = '\0';
 554           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 555             this->is_in_sysroot_ = true;
 556         }
 557       free(canonical_name);
 558     }
 559 }
 560
 561 // Input_arguments methods.
 562
 563 // Add a file to the list.
 564
 565 void
 566 Input_arguments::add_file(const Input_file_argument& file)
 567 {
 568   if (!this->in_group_)
 569     this->input_argument_list_.push_back(Input_argument(file));
 570   else
 571     {
 572       gold_assert(!this->input_argument_list_.empty());
 573       gold_assert(this->input_argument_list_.back().is_group());
 574       this->input_argument_list_.back().group()->add_file(file);
 575     }
 576 }
 577
 578 // Start a group.
 579
 580 void
 581 Input_arguments::start_group()
 582 {
 583   gold_assert(!this->in_group_);
 584   Input_file_group* group = new Input_file_group();
 585   this->input_argument_list_.push_back(Input_argument(group));
 586   this->in_group_ = true;
 587 }
 588
 589 // End a group.
 590
 591 void
 592 Input_arguments::end_group()
 593 {
 594   gold_assert(this->in_group_);
 595   this->in_group_ = false;
 596 }
 597
 598 // Command_line options.
 599
 600 Command_line::Command_line()
 601   : options_(), position_options_(), inputs_()
 602 {
 603 }
 604
 605 // Process the command line options.
 606
 607 void
 608 Command_line::process(int argc, char** argv)
 609 {
 610   const int options_size = options::Command_line_options::options_size;
 611   const options::One_option* options =
 612     options::Command_line_options::options;
 613   bool no_more_options = false;
 614   int i = 0;
 615   while (i < argc)
 616     {
 617       if (argv[i][0] != '-' || no_more_options)
 618         {
 619           this->add_file(argv[i], false);
 620           ++i;
 621           continue;
 622         }
 623
 624       // Option starting with '-'.
 625       int dashes = 1;
 626       if (argv[i][1] == '-')
 627         {
 628           dashes = 2;
 629           if (argv[i][2] == '\0')
 630             {
 631               no_more_options = true;
 632               continue;
 633             }
 634         }
 635
 636       // Look for a long option match.
 637       char* opt = argv[i] + dashes;
 638       char first = opt[0];
 639       int skiparg = 0;
 640       char* arg = strchr(opt, '=');
 641       bool argument_with_equals = arg != NULL;
 642       if (arg != NULL)
 643         {
 644           *arg = '\0';
 645           ++arg;
 646         }
 647       else if (i + 1 < argc)
 648         {
 649           arg = argv[i + 1];
 650           skiparg = 1;
 651         }
 652
 653       int j;
 654       for (j = 0; j < options_size; ++j)
 655         {
 656           if (options[j].long_option != NULL
 657               && (dashes == 2
 658                   || (options[j].dash
 659                       != options::One_option::EXACTLY_TWO_DASHES))
 660               && first == options[j].long_option[0]
 661               && strcmp(opt, options[j].long_option) == 0)
 662             {
 663               if (options[j].special)
 664                 i += options[j].special(argc - 1, argv + i, opt, this);
 665               else
 666                 {
 667                   if (!options[j].takes_argument())
 668                     {
 669                       if (argument_with_equals)
 670                         this->usage(_("unexpected argument"), argv[i]);
 671                       arg = NULL;
 672                       skiparg = 0;
 673                     }
 674                   else
 675                     {
 676                       if (arg == NULL)
 677                         this->usage(_("missing argument"), argv[i]);
 678                     }
 679                   this->apply_option(options[j], arg);
 680                   i += skiparg + 1;
 681                 }
 682               break;
 683             }
 684         }
 685       if (j < options_size)
 686         continue;
 687
 688       // If we saw two dashes, we need to see a long option.
 689       if (dashes == 2)
 690         this->usage(_("unknown option"), argv[i]);
 691
 692       // Look for a short option match.  There may be more than one
 693       // short option in a given argument.
 694       bool done = false;
 695       char* s = argv[i] + 1;
 696       ++i;
 697       while (*s != '\0' && !done)
 698         {
 699           char opt = *s;
 700           int j;
 701           for (j = 0; j < options_size; ++j)
 702             {
 703               if (options[j].short_option == opt)
 704                 {
 705                   if (options[j].special)
 706                     {
 707                       // Undo the argument skip done above.
 708                       --i;
 709                       i += options[j].special(argc - i, argv + i, s, this);
 710                       done = true;
 711                     }
 712                   else
 713                     {
 714                       arg = NULL;
 715                       if (options[j].takes_argument())
 716                         {
 717                           if (s[1] != '\0')
 718                             {
 719                               arg = s + 1;
 720                               done = true;
 721                             }
 722                           else if (i < argc)
 723                             {
 724                               arg = argv[i];
 725                               ++i;
 726                             }
 727                           else
 728                             this->usage(_("missing argument"), opt);
 729                         }
 730                       this->apply_option(options[j], arg);
 731                     }
 732                   break;
 733                 }
 734             }
 735
 736           if (j >= options_size)
 737             this->usage(_("unknown option"), *s);
 738
 739           ++s;
 740         }
 741     }
 742
 743   if (this->inputs_.in_group())
 744     {
 745       fprintf(stderr, _("%s: missing group end\n"), program_name);
 746       this->usage();
 747     }
 748
 749   // FIXME: We should only do this when configured in native mode.
 750   this->options_.add_to_search_path_with_sysroot("/lib");
 751   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 752
 753   this->options_.add_sysroot();
 754
 755   // Ensure options don't contradict each other and are otherwise kosher.
 756   this->normalize_options();
 757 }
 758
 759 // Ensure options don't contradict each other and are otherwise kosher.
 760
 761 void
 762 Command_line::normalize_options()
 763 {
 764   // If the user specifies both -s and -r, convert the -s as -S.
 765   // -r requires us to keep externally visible symbols!
 766   if (this->options_.strip_all() && this->options_.is_relocatable())
 767     {
 768       // Clears the strip_all() status, replacing it with strip_debug().
 769       this->options_.set_strip_debug();
 770     }
 771
 772   // FIXME: we can/should be doing a lot more sanity checking here.
 773 }
 774
 775
 776 // Apply a command line option.
 777
 778 void
 779 Command_line::apply_option(const options::One_option& opt,
 780                            const char* arg)
 781 {
 782   if (arg == NULL)
 783     {
 784       if (opt.general_noarg)
 785         (this->options_.*(opt.general_noarg))();
 786       else if (opt.dependent_noarg)
 787         (this->position_options_.*(opt.dependent_noarg))();
 788       else
 789         gold_unreachable();
 790     }
 791   else
 792     {
 793       if (opt.general_arg)
 794         (this->options_.*(opt.general_arg))(arg);
 795       else if (opt.dependent_arg)
 796         (this->position_options_.*(opt.dependent_arg))(arg);
 797       else
 798         gold_unreachable();
 799     }
 800 }
 801
 802 // Add an input file or library.
 803
 804 void
 805 Command_line::add_file(const char* name, bool is_lib)
 806 {
 807   Input_file_argument file(name, is_lib, "", this->position_options_);
 808   this->inputs_.add_file(file);
 809 }
 810
 811 // Handle the -l option, which requires special treatment.
 812
 813 int
 814 Command_line::process_l_option(int argc, char** argv, char* arg)
 815 {
 816   int ret;
 817   const char* libname;
 818   if (arg[1] != '\0')
 819     {
 820       ret = 1;
 821       libname = arg + 1;
 822     }
 823   else if (argc > 1)
 824     {
 825       ret = 2;
 826       libname = argv[argc + 1];
 827     }
 828   else
 829     this->usage(_("missing argument"), arg);
 830
 831   this->add_file(libname, true);
 832
 833   return ret;
 834 }
 835
 836 // Handle the --start-group option.
 837
 838 void
 839 Command_line::start_group(const char* arg)
 840 {
 841   if (this->inputs_.in_group())
 842     this->usage(_("may not nest groups"), arg);
 843   this->inputs_.start_group();
 844 }
 845
 846 // Handle the --end-group option.
 847
 848 void
 849 Command_line::end_group(const char* arg)
 850 {
 851   if (!this->inputs_.in_group())
 852     this->usage(_("group end without group start"), arg);
 853   this->inputs_.end_group();
 854 }
 855
 856 // Report a usage error.  */
 857
 858 void
 859 Command_line::usage()
 860 {
 861   fprintf(stderr,
 862           _("%s: use the --help option for usage information\n"),
 863           program_name);
 864   ::exit(1);
 865 }
 866
 867 void
 868 Command_line::usage(const char* msg, const char *opt)
 869 {
 870   fprintf(stderr,
 871           _("%s: %s: %s\n"),
 872           program_name, opt, msg);
 873   this->usage();
 874 }
 875
 876 void
 877 Command_line::usage(const char* msg, char opt)
 878 {
 879   fprintf(stderr,
 880           _("%s: -%c: %s\n"),
 881           program_name, opt, msg);
 882   this->usage();
 883 }
 884
 885 } // End namespace gold.