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, bool long_option,
  73                  Command_line*);
  74
  75   // If this is a position independent option which does not take an
  76   // argument, this is the member function to call to record it.
  77   void (General_options::*general_noarg)();
  78
  79   // If this is a position independent function which takes an
  80   // argument, this is the member function to call to record it.
  81   void (General_options::*general_arg)(const char*);
  82
  83   // If this is a position dependent option which does not take an
  84   // argument, this is the member function to call to record it.
  85   void (Position_dependent_options::*dependent_noarg)();
  86
  87   // If this is a position dependent option which takes an argument,
  88   // this is the member function to record it.
  89   void (Position_dependent_options::*dependent_arg)(const char*);
  90
  91   // Return whether this option takes an argument.
  92   bool
  93   takes_argument() const
  94   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  95 };
  96
  97 // We have a separate table for -z options.
  98
  99 struct options::One_z_option
 100 {
 101   // The name of the option.
 102   const char* name;
 103
 104   // The member function in General_options called to record it.
 105   void (General_options::*set)();
 106 };
 107
 108 class options::Command_line_options
 109 {
 110  public:
 111   static const One_option options[];
 112   static const int options_size;
 113   static const One_z_option z_options[];
 114   static const int z_options_size;
 115 };
 116
 117 } // End namespace gold.
 118
 119 namespace
 120 {
 121
 122 // Handle the special -l option, which adds an input file.
 123
 124 int
 125 library(int argc, char** argv, char* arg, bool long_option,
 126         gold::Command_line* cmdline)
 127 {
 128   return cmdline->process_l_option(argc, argv, arg, long_option);
 129 }
 130
 131 // Handle the special -T/--script option, which reads a linker script.
 132
 133 int
 134 invoke_script(int argc, char** argv, char* arg, bool long_option,
 135               gold::Command_line* cmdline)
 136 {
 137   int ret;
 138   const char* script_name = cmdline->get_special_argument("script", argc, argv,
 139                                                           arg, long_option,
 140                                                           &ret);
 141   if (!read_commandline_script(script_name, cmdline))
 142     gold::gold_error(_("%s: unable to parse script file %s\n"),
 143                      gold::program_name, arg);
 144   return ret;
 145 }
 146
 147 // Handle the special --start-group option.
 148
 149 int
 150 start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 151 {
 152   cmdline->start_group(arg);
 153   return 1;
 154 }
 155
 156 // Handle the special --end-group option.
 157
 158 int
 159 end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 160 {
 161   cmdline->end_group(arg);
 162   return 1;
 163 }
 164
 165 // Report usage information for ld --help, and exit.
 166
 167 int
 168 help(int, char**, char*, bool, gold::Command_line*)
 169 {
 170   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 171
 172   const int options_size = gold::options::Command_line_options::options_size;
 173   const gold::options::One_option* options =
 174     gold::options::Command_line_options::options;
 175   for (int i = 0; i < options_size; ++i)
 176     {
 177       if (options[i].doc == NULL)
 178         continue;
 179
 180       printf("  ");
 181       int len = 2;
 182       bool comma = false;
 183
 184       int j = i;
 185       do
 186         {
 187           if (options[j].help_output != NULL)
 188             {
 189               if (comma)
 190                 {
 191                   printf(", ");
 192                   len += 2;
 193                 }
 194               printf(options[j].help_output);
 195               len += std::strlen(options[i].help_output);
 196               comma = true;
 197             }
 198           else
 199             {
 200               if (options[j].short_option != '\0')
 201                 {
 202                   if (comma)
 203                     {
 204                       printf(", ");
 205                       len += 2;
 206                     }
 207                   printf("-%c", options[j].short_option);
 208                   len += 2;
 209                   comma = true;
 210                 }
 211
 212               if (options[j].long_option != NULL)
 213                 {
 214                   if (comma)
 215                     {
 216                       printf(", ");
 217                       len += 2;
 218                     }
 219                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 220                     {
 221                       printf("-");
 222                       ++len;
 223                     }
 224                   else
 225                     {
 226                       printf("--");
 227                       len += 2;
 228                     }
 229                   printf("%s", options[j].long_option);
 230                   len += std::strlen(options[j].long_option);
 231                   comma = true;
 232                 }
 233             }
 234           ++j;
 235         }
 236       while (j < options_size && options[j].doc == NULL);
 237
 238       if (len >= 30)
 239         {
 240           printf("\n");
 241           len = 0;
 242         }
 243       for (; len < 30; ++len)
 244         std::putchar(' ');
 245
 246       std::puts(options[i].doc);
 247     }
 248
 249   ::exit(0);
 250
 251   return 0;
 252 }
 253
 254 // Report version information.
 255
 256 int
 257 version(int, char**, char* opt, bool, gold::Command_line*)
 258 {
 259   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 260   ::exit(0);
 261   return 0;
 262 }
 263
 264 // If the default sysroot is relocatable, try relocating it based on
 265 // the prefix FROM.
 266
 267 char*
 268 get_relative_sysroot(const char* from)
 269 {
 270   char* path = make_relative_prefix(gold::program_name, from,
 271                                     TARGET_SYSTEM_ROOT);
 272   if (path != NULL)
 273     {
 274       struct stat s;
 275       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 276         return path;
 277       free(path);
 278     }
 279
 280   return NULL;
 281 }
 282
 283 // Return the default sysroot.  This is set by the --with-sysroot
 284 // option to configure.
 285
 286 std::string
 287 get_default_sysroot()
 288 {
 289   const char* sysroot = TARGET_SYSTEM_ROOT;
 290   if (*sysroot == '\0')
 291     return "";
 292
 293   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 294     {
 295       char* path = get_relative_sysroot (BINDIR);
 296       if (path == NULL)
 297         path = get_relative_sysroot (TOOLBINDIR);
 298       if (path != NULL)
 299         {
 300           std::string ret = path;
 301           free(path);
 302           return ret;
 303         }
 304     }
 305
 306   return sysroot;
 307 }
 308
 309 } // End anonymous namespace.
 310
 311 namespace gold
 312 {
 313
 314 // Helper macros used to specify the options.  We could also do this
 315 // using constructors, but then g++ would generate code to initialize
 316 // the array.  We want the array to be initialized statically so that
 317 // we get better startup time.
 318
 319 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 320   { short_option, long_option, doc, help, options::One_option::dash, \
 321       NULL, func, NULL, NULL, NULL }
 322 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 323   { short_option, long_option, doc, help, options::One_option::dash, \
 324       NULL, NULL, func, NULL, NULL }
 325 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 326   { short_option, long_option, doc, help, options::One_option::dash, \
 327       NULL,  NULL, NULL, func, NULL }
 328 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 329   { short_option, long_option, doc, help, options::One_option::dash, \
 330       NULL, NULL, NULL, NULL, func }
 331 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 332   { short_option, long_option, doc, help, options::One_option::dash, \
 333       func, NULL, NULL, NULL, NULL }
 334
 335 // Here is the actual list of options which we accept.
 336
 337 const options::One_option
 338 options::Command_line_options::options[] =
 339 {
 340   POSDEP_NOARG('\0', "as-needed",
 341                N_("Only set DT_NEEDED for dynamic libs if used"),
 342                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 343   POSDEP_NOARG('\0', "no-as-needed",
 344                N_("Always DT_NEEDED for dynamic libs (default)"),
 345                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 346   POSDEP_NOARG('\0', "Bdynamic",
 347                N_("-l searches for shared libraries"),
 348                NULL, ONE_DASH,
 349                &Position_dependent_options::set_dynamic_search),
 350   POSDEP_NOARG('\0', "Bstatic",
 351                N_("-l does not search for shared libraries"),
 352                NULL, ONE_DASH,
 353                &Position_dependent_options::set_static_search),
 354   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 355                 NULL, ONE_DASH, &General_options::set_symbolic),
 356   GENERAL_NOARG('\0', "detect-odr-violations",
 357                 N_("Try to detect violations of the One Definition Rule"),
 358                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 359   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 360                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 361   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 362                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 363   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 364               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 365               &General_options::set_dynamic_linker),
 366   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 367           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 368           &library),
 369   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 370               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 371               &General_options::add_to_search_path),
 372   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 373               &General_options::ignore),
 374   GENERAL_ARG('o', "output", N_("Set output file name"),
 375               N_("-o FILE, --output FILE"), TWO_DASHES,
 376               &General_options::set_output_file_name),
 377   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 378               N_("-O level"), ONE_DASH,
 379               &General_options::set_optimization_level),
 380   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 381                 ONE_DASH, &General_options::set_relocatable),
 382   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 383               N_("-R DIR, -rpath DIR"), ONE_DASH,
 384               &General_options::add_to_rpath),
 385   GENERAL_ARG('\0', "rpath-link",
 386               N_("Add DIR to link time shared library search path"),
 387               N_("--rpath-link DIR"), TWO_DASHES,
 388               &General_options::add_to_rpath_link),
 389   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 390                 TWO_DASHES, &General_options::set_strip_all),
 391   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 392                 TWO_DASHES, &General_options::set_strip_debug),
 393   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 394                 NULL, ONE_DASH, &General_options::set_shared),
 395   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 396                 NULL, ONE_DASH, &General_options::set_static),
 397   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 398                 NULL, TWO_DASHES, &General_options::set_stats),
 399   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 400               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 401   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 402               N_("-Ttext ADDRESS"), ONE_DASH,
 403               &General_options::set_text_segment_address),
 404   // This must come after -Ttext since it's a prefix of it.
 405   SPECIAL('T', "script", N_("Read linker script"),
 406           N_("-T FILE, --script FILE"), TWO_DASHES,
 407           &invoke_script),
 408   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 409                 NULL, TWO_DASHES, &General_options::set_threads),
 410   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 411                 NULL, TWO_DASHES, &General_options::clear_threads),
 412   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 413               N_("--thread-count COUNT"), TWO_DASHES,
 414               &General_options::set_thread_count),
 415   GENERAL_ARG('\0', "thread-count-initial",
 416               N_("Number of threads to use in initial pass"),
 417               N_("--thread-count-initial COUNT"), TWO_DASHES,
 418               &General_options::set_thread_count_initial),
 419   GENERAL_ARG('\0', "thread-count-middle",
 420               N_("Number of threads to use in middle pass"),
 421               N_("--thread-count-middle COUNT"), TWO_DASHES,
 422               &General_options::set_thread_count_middle),
 423   GENERAL_ARG('\0', "thread-count-final",
 424               N_("Number of threads to use in final pass"),
 425               N_("--thread-count-final COUNT"), TWO_DASHES,
 426               &General_options::set_thread_count_final),
 427   POSDEP_NOARG('\0', "whole-archive",
 428                N_("Include all archive contents"),
 429                NULL, TWO_DASHES,
 430                &Position_dependent_options::set_whole_archive),
 431   POSDEP_NOARG('\0', "no-whole-archive",
 432                N_("Include only needed archive contents"),
 433                NULL, TWO_DASHES,
 434                &Position_dependent_options::clear_whole_archive),
 435
 436   GENERAL_ARG('z', NULL,
 437               N_("Subcommands as follows:\n\
 438     -z execstack              Mark output as requiring executable stack\n\
 439     -z noexecstack            Mark output as not requiring executable stack"),
 440               N_("-z SUBCOMMAND"), ONE_DASH,
 441               &General_options::handle_z_option),
 442
 443   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 444           TWO_DASHES, &start_group),
 445   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 446           TWO_DASHES, &end_group),
 447   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 448           TWO_DASHES, &help),
 449   SPECIAL('v', "version", N_("Report version information"), NULL,
 450           TWO_DASHES, &version)
 451 };
 452
 453 const int options::Command_line_options::options_size =
 454   sizeof (options) / sizeof (options[0]);
 455
 456 // The -z options.
 457
 458 const options::One_z_option
 459 options::Command_line_options::z_options[] =
 460 {
 461   { "execstack", &General_options::set_execstack },
 462   { "noexecstack", &General_options::set_noexecstack },
 463 };
 464
 465 const int options::Command_line_options::z_options_size =
 466   sizeof(z_options) / sizeof(z_options[0]);
 467
 468 // The default values for the general options.
 469
 470 General_options::General_options()
 471   : export_dynamic_(false),
 472     dynamic_linker_(NULL),
 473     search_path_(),
 474     optimization_level_(0),
 475     output_file_name_("a.out"),
 476     is_relocatable_(false),
 477     strip_(STRIP_NONE),
 478     symbolic_(false),
 479     detect_odr_violations_(false),
 480     create_eh_frame_hdr_(false),
 481     rpath_(),
 482     rpath_link_(),
 483     is_shared_(false),
 484     is_static_(false),
 485     print_stats_(false),
 486     sysroot_(),
 487     text_segment_address_(-1U),   // -1 indicates value not set by user
 488     threads_(false),
 489     thread_count_initial_(0),
 490     thread_count_middle_(0),
 491     thread_count_final_(0),
 492     execstack_(EXECSTACK_FROM_INPUT)
 493 {
 494 }
 495
 496 // The default values for the position dependent options.
 497
 498 Position_dependent_options::Position_dependent_options()
 499   : do_static_search_(false),
 500     as_needed_(false),
 501     include_whole_archive_(false)
 502 {
 503 }
 504
 505 // Handle the -z option.
 506
 507 void
 508 General_options::handle_z_option(const char* arg)
 509 {
 510   const int z_options_size = options::Command_line_options::z_options_size;
 511   const gold::options::One_z_option* z_options =
 512     gold::options::Command_line_options::z_options;
 513   for (int i = 0; i < z_options_size; ++i)
 514     {
 515       if (strcmp(arg, z_options[i].name) == 0)
 516         {
 517           (this->*(z_options[i].set))();
 518           return;
 519         }
 520     }
 521
 522   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 523           program_name, arg);
 524   ::exit(1);
 525 }
 526
 527 // Add the sysroot, if any, to the search paths.
 528
 529 void
 530 General_options::add_sysroot()
 531 {
 532   if (this->sysroot_.empty())
 533     {
 534       this->sysroot_ = get_default_sysroot();
 535       if (this->sysroot_.empty())
 536         return;
 537     }
 538
 539   const char* sysroot = this->sysroot_.c_str();
 540   char* canonical_sysroot = lrealpath(sysroot);
 541
 542   for (Dir_list::iterator p = this->search_path_.begin();
 543        p != this->search_path_.end();
 544        ++p)
 545     p->add_sysroot(sysroot, canonical_sysroot);
 546
 547   free(canonical_sysroot);
 548 }
 549
 550 // Search_directory methods.
 551
 552 // This is called if we have a sysroot.  Apply the sysroot if
 553 // appropriate.  Record whether the directory is in the sysroot.
 554
 555 void
 556 Search_directory::add_sysroot(const char* sysroot,
 557                               const char* canonical_sysroot)
 558 {
 559   gold_assert(*sysroot != '\0');
 560   if (this->put_in_sysroot_)
 561     {
 562       if (!IS_DIR_SEPARATOR(this->name_[0])
 563           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 564         this->name_ = '/' + this->name_;
 565       this->name_ = sysroot + this->name_;
 566       this->is_in_sysroot_ = true;
 567     }
 568   else
 569     {
 570       // Check whether this entry is in the sysroot.  To do this
 571       // correctly, we need to use canonical names.  Otherwise we will
 572       // get confused by the ../../.. paths that gcc tends to use.
 573       char* canonical_name = lrealpath(this->name_.c_str());
 574       int canonical_name_len = strlen(canonical_name);
 575       int canonical_sysroot_len = strlen(canonical_sysroot);
 576       if (canonical_name_len > canonical_sysroot_len
 577           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 578         {
 579           canonical_name[canonical_sysroot_len] = '\0';
 580           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 581             this->is_in_sysroot_ = true;
 582         }
 583       free(canonical_name);
 584     }
 585 }
 586
 587 // Input_arguments methods.
 588
 589 // Add a file to the list.
 590
 591 void
 592 Input_arguments::add_file(const Input_file_argument& file)
 593 {
 594   if (!this->in_group_)
 595     this->input_argument_list_.push_back(Input_argument(file));
 596   else
 597     {
 598       gold_assert(!this->input_argument_list_.empty());
 599       gold_assert(this->input_argument_list_.back().is_group());
 600       this->input_argument_list_.back().group()->add_file(file);
 601     }
 602 }
 603
 604 // Start a group.
 605
 606 void
 607 Input_arguments::start_group()
 608 {
 609   gold_assert(!this->in_group_);
 610   Input_file_group* group = new Input_file_group();
 611   this->input_argument_list_.push_back(Input_argument(group));
 612   this->in_group_ = true;
 613 }
 614
 615 // End a group.
 616
 617 void
 618 Input_arguments::end_group()
 619 {
 620   gold_assert(this->in_group_);
 621   this->in_group_ = false;
 622 }
 623
 624 // Command_line options.
 625
 626 Command_line::Command_line()
 627   : options_(), position_options_(), inputs_()
 628 {
 629 }
 630
 631 // Process the command line options.  For process_one_option,
 632 // i is the index of argv to process next, and the return value
 633 // is the index of the next option to process (i+1 or i+2, or argc
 634 // to indicate processing is done).  no_more_options is set to true
 635 // if (and when) "--" is seen as an option.
 636
 637 int
 638 Command_line::process_one_option(int argc, char** argv, int i,
 639                                  bool* no_more_options)
 640 {
 641   const int options_size = options::Command_line_options::options_size;
 642   const options::One_option* options = options::Command_line_options::options;
 643   gold_assert(i < argc);
 644
 645   if (argv[i][0] != '-' || *no_more_options)
 646     {
 647       this->add_file(argv[i], false);
 648       return i + 1;
 649     }
 650
 651   // Option starting with '-'.
 652   int dashes = 1;
 653   if (argv[i][1] == '-')
 654     {
 655       dashes = 2;
 656       if (argv[i][2] == '\0')
 657         {
 658           *no_more_options = true;
 659           return i + 1;
 660         }
 661     }
 662
 663   // Look for a long option match.
 664   char* opt = argv[i] + dashes;
 665   char first = opt[0];
 666   int skiparg = 0;
 667   char* arg = strchr(opt, '=');
 668   bool argument_with_equals = arg != NULL;
 669   if (arg != NULL)
 670     {
 671       *arg = '\0';
 672       ++arg;
 673     }
 674   else if (i + 1 < argc)
 675     {
 676       arg = argv[i + 1];
 677       skiparg = 1;
 678     }
 679
 680   int j;
 681   for (j = 0; j < options_size; ++j)
 682     {
 683       if (options[j].long_option != NULL
 684           && (dashes == 2
 685           || (options[j].dash
 686               != options::One_option::EXACTLY_TWO_DASHES))
 687           && first == options[j].long_option[0]
 688           && strcmp(opt, options[j].long_option) == 0)
 689         {
 690           if (options[j].special)
 691             {
 692               // Restore the '=' we clobbered above.
 693               if (arg != NULL && skiparg == 0)
 694                 arg[-1] = '=';
 695               i += options[j].special(argc - i, argv + i, opt, true, this);
 696             }
 697           else
 698             {
 699               if (!options[j].takes_argument())
 700                 {
 701                   if (argument_with_equals)
 702                     this->usage(_("unexpected argument"), argv[i]);
 703                   arg = NULL;
 704                   skiparg = 0;
 705                 }
 706               else
 707                 {
 708                   if (arg == NULL)
 709                     this->usage(_("missing argument"), argv[i]);
 710                 }
 711               this->apply_option(options[j], arg);
 712               i += skiparg + 1;
 713             }
 714           break;
 715         }
 716     }
 717   if (j < options_size)
 718     return i;
 719
 720   // If we saw two dashes, we needed to have seen a long option.
 721   if (dashes == 2)
 722     this->usage(_("unknown option"), argv[i]);
 723
 724   // Look for a short option match.  There may be more than one
 725   // short option in a given argument.
 726   bool done = false;
 727   char* s = argv[i] + 1;
 728   ++i;
 729   while (*s != '\0' && !done)
 730     {
 731       char opt = *s;
 732       int j;
 733       for (j = 0; j < options_size; ++j)
 734         {
 735           if (options[j].short_option == opt)
 736             {
 737               if (options[j].special)
 738                 {
 739                   // Undo the argument skip done above.
 740                   --i;
 741                   i += options[j].special(argc - i, argv + i, s, false,
 742                                           this);
 743                   done = true;
 744                 }
 745               else
 746                 {
 747                   arg = NULL;
 748                   if (options[j].takes_argument())
 749                     {
 750                       if (s[1] != '\0')
 751                         {
 752                           arg = s + 1;
 753                           done = true;
 754                         }
 755                       else if (i < argc)
 756                         {
 757                           arg = argv[i];
 758                           ++i;
 759                         }
 760                       else
 761                         this->usage(_("missing argument"), opt);
 762                     }
 763                   this->apply_option(options[j], arg);
 764                 }
 765               break;
 766             }
 767         }
 768
 769       if (j >= options_size)
 770         this->usage(_("unknown option"), *s);
 771
 772       ++s;
 773     }
 774   return i;
 775 }
 776
 777
 778 void
 779 Command_line::process(int argc, char** argv)
 780 {
 781   bool no_more_options = false;
 782   int i = 0;
 783   while (i < argc)
 784     i = process_one_option(argc, argv, i, &no_more_options);
 785
 786   if (this->inputs_.in_group())
 787     {
 788       fprintf(stderr, _("%s: missing group end\n"), program_name);
 789       this->usage();
 790     }
 791
 792   // FIXME: We should only do this when configured in native mode.
 793   this->options_.add_to_search_path_with_sysroot("/lib");
 794   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 795
 796   this->options_.add_sysroot();
 797
 798   // Ensure options don't contradict each other and are otherwise kosher.
 799   this->normalize_options();
 800 }
 801
 802 // Extract an option argument for a special option.  LONGNAME is the
 803 // long name of the option.  This sets *PRET to the return value for
 804 // the special function handler to skip to the next option.
 805
 806 const char*
 807 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 808                                    const char* arg, bool long_option,
 809                                    int *pret)
 810 {
 811   if (long_option)
 812     {
 813       size_t longlen = strlen(longname);
 814       gold_assert(strncmp(arg, longname, longlen) == 0);
 815       arg += longlen;
 816       if (*arg == '=')
 817         {
 818           *pret = 1;
 819           return arg + 1;
 820         }
 821       else if (argc > 1)
 822         {
 823           gold_assert(*arg == '\0');
 824           *pret = 2;
 825           return argv[1];
 826         }
 827     }
 828   else
 829     {
 830       if (arg[1] != '\0')
 831         {
 832           *pret = 1;
 833           return arg + 1;
 834         }
 835       else if (argc > 1)
 836         {
 837           *pret = 2;
 838           return argv[1];
 839         }
 840     }
 841
 842   this->usage(_("missing argument"), arg);
 843 }
 844
 845 // Ensure options don't contradict each other and are otherwise kosher.
 846
 847 void
 848 Command_line::normalize_options()
 849 {
 850   // If the user specifies both -s and -r, convert the -s as -S.
 851   // -r requires us to keep externally visible symbols!
 852   if (this->options_.strip_all() && this->options_.is_relocatable())
 853     {
 854       // Clears the strip_all() status, replacing it with strip_debug().
 855       this->options_.set_strip_debug();
 856     }
 857
 858   // FIXME: we can/should be doing a lot more sanity checking here.
 859 }
 860
 861
 862 // Apply a command line option.
 863
 864 void
 865 Command_line::apply_option(const options::One_option& opt,
 866                            const char* arg)
 867 {
 868   if (arg == NULL)
 869     {
 870       if (opt.general_noarg)
 871         (this->options_.*(opt.general_noarg))();
 872       else if (opt.dependent_noarg)
 873         (this->position_options_.*(opt.dependent_noarg))();
 874       else
 875         gold_unreachable();
 876     }
 877   else
 878     {
 879       if (opt.general_arg)
 880         (this->options_.*(opt.general_arg))(arg);
 881       else if (opt.dependent_arg)
 882         (this->position_options_.*(opt.dependent_arg))(arg);
 883       else
 884         gold_unreachable();
 885     }
 886 }
 887
 888 // Add an input file or library.
 889
 890 void
 891 Command_line::add_file(const char* name, bool is_lib)
 892 {
 893   Input_file_argument file(name, is_lib, "", this->position_options_);
 894   this->inputs_.add_file(file);
 895 }
 896
 897 // Handle the -l option, which requires special treatment.
 898
 899 int
 900 Command_line::process_l_option(int argc, char** argv, char* arg,
 901                                bool long_option)
 902 {
 903   int ret;
 904   const char* libname = this->get_special_argument("library", argc, argv, arg,
 905                                                    long_option, &ret);
 906   this->add_file(libname, true);
 907   return ret;
 908 }
 909
 910 // Handle the --start-group option.
 911
 912 void
 913 Command_line::start_group(const char* arg)
 914 {
 915   if (this->inputs_.in_group())
 916     this->usage(_("may not nest groups"), arg);
 917   this->inputs_.start_group();
 918 }
 919
 920 // Handle the --end-group option.
 921
 922 void
 923 Command_line::end_group(const char* arg)
 924 {
 925   if (!this->inputs_.in_group())
 926     this->usage(_("group end without group start"), arg);
 927   this->inputs_.end_group();
 928 }
 929
 930 // Report a usage error.  */
 931
 932 void
 933 Command_line::usage()
 934 {
 935   fprintf(stderr,
 936           _("%s: use the --help option for usage information\n"),
 937           program_name);
 938   ::exit(1);
 939 }
 940
 941 void
 942 Command_line::usage(const char* msg, const char *opt)
 943 {
 944   fprintf(stderr,
 945           _("%s: %s: %s\n"),
 946           program_name, opt, msg);
 947   this->usage();
 948 }
 949
 950 void
 951 Command_line::usage(const char* msg, char opt)
 952 {
 953   fprintf(stderr,
 954           _("%s: -%c: %s\n"),
 955           program_name, opt, msg);
 956   this->usage();
 957 }
 958
 959 } // End namespace gold.