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('E', "export-dynamic", N_("Export all dynamic symbols"),
 357                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 358   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 359                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 360   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 361               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 362               &General_options::set_dynamic_linker),
 363   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 364           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 365           &library),
 366   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 367               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 368               &General_options::add_to_search_path),
 369   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 370               &General_options::ignore),
 371   GENERAL_ARG('o', "output", N_("Set output file name"),
 372               N_("-o FILE, --output FILE"), TWO_DASHES,
 373               &General_options::set_output_file_name),
 374   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 375               N_("-O level"), ONE_DASH,
 376               &General_options::set_optimization_level),
 377   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 378                 ONE_DASH, &General_options::set_relocatable),
 379   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 380               N_("-R DIR, -rpath DIR"), ONE_DASH,
 381               &General_options::add_to_rpath),
 382   GENERAL_ARG('\0', "rpath-link",
 383               N_("Add DIR to link time shared library search path"),
 384               N_("--rpath-link DIR"), TWO_DASHES,
 385               &General_options::add_to_rpath_link),
 386   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 387                 TWO_DASHES, &General_options::set_strip_all),
 388   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 389                 TWO_DASHES, &General_options::set_strip_debug),
 390   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 391                 NULL, ONE_DASH, &General_options::set_shared),
 392   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 393                 NULL, ONE_DASH, &General_options::set_static),
 394   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 395                 NULL, TWO_DASHES, &General_options::set_stats),
 396   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 397               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 398   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 399               N_("-Ttext ADDRESS"), ONE_DASH,
 400               &General_options::set_text_segment_address),
 401   // This must come after -Ttext since it's a prefix of it.
 402   SPECIAL('T', "script", N_("Read linker script"),
 403           N_("-T FILE, --script FILE"), TWO_DASHES,
 404           &invoke_script),
 405   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 406                 NULL, TWO_DASHES, &General_options::set_threads),
 407   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 408                 NULL, TWO_DASHES, &General_options::clear_threads),
 409   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 410               N_("--thread-count COUNT"), TWO_DASHES,
 411               &General_options::set_thread_count),
 412   GENERAL_ARG('\0', "thread-count-initial",
 413               N_("Number of threads to use in initial pass"),
 414               N_("--thread-count-initial COUNT"), TWO_DASHES,
 415               &General_options::set_thread_count_initial),
 416   GENERAL_ARG('\0', "thread-count-middle",
 417               N_("Number of threads to use in middle pass"),
 418               N_("--thread-count-middle COUNT"), TWO_DASHES,
 419               &General_options::set_thread_count_middle),
 420   GENERAL_ARG('\0', "thread-count-final",
 421               N_("Number of threads to use in final pass"),
 422               N_("--thread-count-final COUNT"), TWO_DASHES,
 423               &General_options::set_thread_count_final),
 424   POSDEP_NOARG('\0', "whole-archive",
 425                N_("Include all archive contents"),
 426                NULL, TWO_DASHES,
 427                &Position_dependent_options::set_whole_archive),
 428   POSDEP_NOARG('\0', "no-whole-archive",
 429                N_("Include only needed archive contents"),
 430                NULL, TWO_DASHES,
 431                &Position_dependent_options::clear_whole_archive),
 432
 433   GENERAL_ARG('z', NULL,
 434               N_("Subcommands as follows:\n\
 435     -z execstack              Mark output as requiring executable stack\n\
 436     -z noexecstack            Mark output as not requiring executable stack"),
 437               N_("-z SUBCOMMAND"), ONE_DASH,
 438               &General_options::handle_z_option),
 439
 440   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 441           TWO_DASHES, &start_group),
 442   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 443           TWO_DASHES, &end_group),
 444   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 445           TWO_DASHES, &help),
 446   SPECIAL('v', "version", N_("Report version information"), NULL,
 447           TWO_DASHES, &version)
 448 };
 449
 450 const int options::Command_line_options::options_size =
 451   sizeof (options) / sizeof (options[0]);
 452
 453 // The -z options.
 454
 455 const options::One_z_option
 456 options::Command_line_options::z_options[] =
 457 {
 458   { "execstack", &General_options::set_execstack },
 459   { "noexecstack", &General_options::set_noexecstack },
 460 };
 461
 462 const int options::Command_line_options::z_options_size =
 463   sizeof(z_options) / sizeof(z_options[0]);
 464
 465 // The default values for the general options.
 466
 467 General_options::General_options()
 468   : export_dynamic_(false),
 469     dynamic_linker_(NULL),
 470     search_path_(),
 471     optimization_level_(0),
 472     output_file_name_("a.out"),
 473     is_relocatable_(false),
 474     strip_(STRIP_NONE),
 475     symbolic_(false),
 476     create_eh_frame_hdr_(false),
 477     rpath_(),
 478     rpath_link_(),
 479     is_shared_(false),
 480     is_static_(false),
 481     print_stats_(false),
 482     sysroot_(),
 483     text_segment_address_(-1U),   // -1 indicates value not set by user
 484     threads_(false),
 485     thread_count_initial_(0),
 486     thread_count_middle_(0),
 487     thread_count_final_(0),
 488     execstack_(EXECSTACK_FROM_INPUT)
 489 {
 490 }
 491
 492 // The default values for the position dependent options.
 493
 494 Position_dependent_options::Position_dependent_options()
 495   : do_static_search_(false),
 496     as_needed_(false),
 497     include_whole_archive_(false)
 498 {
 499 }
 500
 501 // Handle the -z option.
 502
 503 void
 504 General_options::handle_z_option(const char* arg)
 505 {
 506   const int z_options_size = options::Command_line_options::z_options_size;
 507   const gold::options::One_z_option* z_options =
 508     gold::options::Command_line_options::z_options;
 509   for (int i = 0; i < z_options_size; ++i)
 510     {
 511       if (strcmp(arg, z_options[i].name) == 0)
 512         {
 513           (this->*(z_options[i].set))();
 514           return;
 515         }
 516     }
 517
 518   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 519           program_name, arg);
 520   ::exit(1);
 521 }
 522
 523 // Add the sysroot, if any, to the search paths.
 524
 525 void
 526 General_options::add_sysroot()
 527 {
 528   if (this->sysroot_.empty())
 529     {
 530       this->sysroot_ = get_default_sysroot();
 531       if (this->sysroot_.empty())
 532         return;
 533     }
 534
 535   const char* sysroot = this->sysroot_.c_str();
 536   char* canonical_sysroot = lrealpath(sysroot);
 537
 538   for (Dir_list::iterator p = this->search_path_.begin();
 539        p != this->search_path_.end();
 540        ++p)
 541     p->add_sysroot(sysroot, canonical_sysroot);
 542
 543   free(canonical_sysroot);
 544 }
 545
 546 // Search_directory methods.
 547
 548 // This is called if we have a sysroot.  Apply the sysroot if
 549 // appropriate.  Record whether the directory is in the sysroot.
 550
 551 void
 552 Search_directory::add_sysroot(const char* sysroot,
 553                               const char* canonical_sysroot)
 554 {
 555   gold_assert(*sysroot != '\0');
 556   if (this->put_in_sysroot_)
 557     {
 558       if (!IS_DIR_SEPARATOR(this->name_[0])
 559           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 560         this->name_ = '/' + this->name_;
 561       this->name_ = sysroot + this->name_;
 562       this->is_in_sysroot_ = true;
 563     }
 564   else
 565     {
 566       // Check whether this entry is in the sysroot.  To do this
 567       // correctly, we need to use canonical names.  Otherwise we will
 568       // get confused by the ../../.. paths that gcc tends to use.
 569       char* canonical_name = lrealpath(this->name_.c_str());
 570       int canonical_name_len = strlen(canonical_name);
 571       int canonical_sysroot_len = strlen(canonical_sysroot);
 572       if (canonical_name_len > canonical_sysroot_len
 573           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 574         {
 575           canonical_name[canonical_sysroot_len] = '\0';
 576           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 577             this->is_in_sysroot_ = true;
 578         }
 579       free(canonical_name);
 580     }
 581 }
 582
 583 // Input_arguments methods.
 584
 585 // Add a file to the list.
 586
 587 void
 588 Input_arguments::add_file(const Input_file_argument& file)
 589 {
 590   if (!this->in_group_)
 591     this->input_argument_list_.push_back(Input_argument(file));
 592   else
 593     {
 594       gold_assert(!this->input_argument_list_.empty());
 595       gold_assert(this->input_argument_list_.back().is_group());
 596       this->input_argument_list_.back().group()->add_file(file);
 597     }
 598 }
 599
 600 // Start a group.
 601
 602 void
 603 Input_arguments::start_group()
 604 {
 605   gold_assert(!this->in_group_);
 606   Input_file_group* group = new Input_file_group();
 607   this->input_argument_list_.push_back(Input_argument(group));
 608   this->in_group_ = true;
 609 }
 610
 611 // End a group.
 612
 613 void
 614 Input_arguments::end_group()
 615 {
 616   gold_assert(this->in_group_);
 617   this->in_group_ = false;
 618 }
 619
 620 // Command_line options.
 621
 622 Command_line::Command_line()
 623   : options_(), position_options_(), inputs_()
 624 {
 625 }
 626
 627 // Process the command line options.  For process_one_option,
 628 // i is the index of argv to process next, and the return value
 629 // is the index of the next option to process (i+1 or i+2, or argc
 630 // to indicate processing is done).  no_more_options is set to true
 631 // if (and when) "--" is seen as an option.
 632
 633 int
 634 Command_line::process_one_option(int argc, char** argv, int i,
 635                                  bool* no_more_options)
 636 {
 637   const int options_size = options::Command_line_options::options_size;
 638   const options::One_option* options = options::Command_line_options::options;
 639   gold_assert(i < argc);
 640
 641   if (argv[i][0] != '-' || *no_more_options)
 642     {
 643       this->add_file(argv[i], false);
 644       return i + 1;
 645     }
 646
 647   // Option starting with '-'.
 648   int dashes = 1;
 649   if (argv[i][1] == '-')
 650     {
 651       dashes = 2;
 652       if (argv[i][2] == '\0')
 653         {
 654           *no_more_options = true;
 655           return i + 1;
 656         }
 657     }
 658
 659   // Look for a long option match.
 660   char* opt = argv[i] + dashes;
 661   char first = opt[0];
 662   int skiparg = 0;
 663   char* arg = strchr(opt, '=');
 664   bool argument_with_equals = arg != NULL;
 665   if (arg != NULL)
 666     {
 667       *arg = '\0';
 668       ++arg;
 669     }
 670   else if (i + 1 < argc)
 671     {
 672       arg = argv[i + 1];
 673       skiparg = 1;
 674     }
 675
 676   int j;
 677   for (j = 0; j < options_size; ++j)
 678     {
 679       if (options[j].long_option != NULL
 680           && (dashes == 2
 681           || (options[j].dash
 682               != options::One_option::EXACTLY_TWO_DASHES))
 683           && first == options[j].long_option[0]
 684           && strcmp(opt, options[j].long_option) == 0)
 685         {
 686           if (options[j].special)
 687             {
 688               // Restore the '=' we clobbered above.
 689               if (arg != NULL && skiparg == 0)
 690                 arg[-1] = '=';
 691               i += options[j].special(argc - i, argv + i, opt, true, this);
 692             }
 693           else
 694             {
 695               if (!options[j].takes_argument())
 696                 {
 697                   if (argument_with_equals)
 698                     this->usage(_("unexpected argument"), argv[i]);
 699                   arg = NULL;
 700                   skiparg = 0;
 701                 }
 702               else
 703                 {
 704                   if (arg == NULL)
 705                     this->usage(_("missing argument"), argv[i]);
 706                 }
 707               this->apply_option(options[j], arg);
 708               i += skiparg + 1;
 709             }
 710           break;
 711         }
 712     }
 713   if (j < options_size)
 714     return i;
 715
 716   // If we saw two dashes, we needed to have seen a long option.
 717   if (dashes == 2)
 718     this->usage(_("unknown option"), argv[i]);
 719
 720   // Look for a short option match.  There may be more than one
 721   // short option in a given argument.
 722   bool done = false;
 723   char* s = argv[i] + 1;
 724   ++i;
 725   while (*s != '\0' && !done)
 726     {
 727       char opt = *s;
 728       int j;
 729       for (j = 0; j < options_size; ++j)
 730         {
 731           if (options[j].short_option == opt)
 732             {
 733               if (options[j].special)
 734                 {
 735                   // Undo the argument skip done above.
 736                   --i;
 737                   i += options[j].special(argc - i, argv + i, s, false,
 738                                           this);
 739                   done = true;
 740                 }
 741               else
 742                 {
 743                   arg = NULL;
 744                   if (options[j].takes_argument())
 745                     {
 746                       if (s[1] != '\0')
 747                         {
 748                           arg = s + 1;
 749                           done = true;
 750                         }
 751                       else if (i < argc)
 752                         {
 753                           arg = argv[i];
 754                           ++i;
 755                         }
 756                       else
 757                         this->usage(_("missing argument"), opt);
 758                     }
 759                   this->apply_option(options[j], arg);
 760                 }
 761               break;
 762             }
 763         }
 764
 765       if (j >= options_size)
 766         this->usage(_("unknown option"), *s);
 767
 768       ++s;
 769     }
 770   return i;
 771 }
 772
 773
 774 void
 775 Command_line::process(int argc, char** argv)
 776 {
 777   bool no_more_options = false;
 778   int i = 0;
 779   while (i < argc)
 780     i = process_one_option(argc, argv, i, &no_more_options);
 781
 782   if (this->inputs_.in_group())
 783     {
 784       fprintf(stderr, _("%s: missing group end\n"), program_name);
 785       this->usage();
 786     }
 787
 788   // FIXME: We should only do this when configured in native mode.
 789   this->options_.add_to_search_path_with_sysroot("/lib");
 790   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 791
 792   this->options_.add_sysroot();
 793
 794   // Ensure options don't contradict each other and are otherwise kosher.
 795   this->normalize_options();
 796 }
 797
 798 // Extract an option argument for a special option.  LONGNAME is the
 799 // long name of the option.  This sets *PRET to the return value for
 800 // the special function handler to skip to the next option.
 801
 802 const char*
 803 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 804                                    const char* arg, bool long_option,
 805                                    int *pret)
 806 {
 807   if (long_option)
 808     {
 809       size_t longlen = strlen(longname);
 810       gold_assert(strncmp(arg, longname, longlen) == 0);
 811       arg += longlen;
 812       if (*arg == '=')
 813         {
 814           *pret = 1;
 815           return arg + 1;
 816         }
 817       else if (argc > 1)
 818         {
 819           gold_assert(*arg == '\0');
 820           *pret = 2;
 821           return argv[1];
 822         }
 823     }
 824   else
 825     {
 826       if (arg[1] != '\0')
 827         {
 828           *pret = 1;
 829           return arg + 1;
 830         }
 831       else if (argc > 1)
 832         {
 833           *pret = 2;
 834           return argv[1];
 835         }
 836     }
 837
 838   this->usage(_("missing argument"), arg);
 839 }
 840
 841 // Ensure options don't contradict each other and are otherwise kosher.
 842
 843 void
 844 Command_line::normalize_options()
 845 {
 846   // If the user specifies both -s and -r, convert the -s as -S.
 847   // -r requires us to keep externally visible symbols!
 848   if (this->options_.strip_all() && this->options_.is_relocatable())
 849     {
 850       // Clears the strip_all() status, replacing it with strip_debug().
 851       this->options_.set_strip_debug();
 852     }
 853
 854   // FIXME: we can/should be doing a lot more sanity checking here.
 855 }
 856
 857
 858 // Apply a command line option.
 859
 860 void
 861 Command_line::apply_option(const options::One_option& opt,
 862                            const char* arg)
 863 {
 864   if (arg == NULL)
 865     {
 866       if (opt.general_noarg)
 867         (this->options_.*(opt.general_noarg))();
 868       else if (opt.dependent_noarg)
 869         (this->position_options_.*(opt.dependent_noarg))();
 870       else
 871         gold_unreachable();
 872     }
 873   else
 874     {
 875       if (opt.general_arg)
 876         (this->options_.*(opt.general_arg))(arg);
 877       else if (opt.dependent_arg)
 878         (this->position_options_.*(opt.dependent_arg))(arg);
 879       else
 880         gold_unreachable();
 881     }
 882 }
 883
 884 // Add an input file or library.
 885
 886 void
 887 Command_line::add_file(const char* name, bool is_lib)
 888 {
 889   Input_file_argument file(name, is_lib, "", this->position_options_);
 890   this->inputs_.add_file(file);
 891 }
 892
 893 // Handle the -l option, which requires special treatment.
 894
 895 int
 896 Command_line::process_l_option(int argc, char** argv, char* arg,
 897                                bool long_option)
 898 {
 899   int ret;
 900   const char* libname = this->get_special_argument("library", argc, argv, arg,
 901                                                    long_option, &ret);
 902   this->add_file(libname, true);
 903   return ret;
 904 }
 905
 906 // Handle the --start-group option.
 907
 908 void
 909 Command_line::start_group(const char* arg)
 910 {
 911   if (this->inputs_.in_group())
 912     this->usage(_("may not nest groups"), arg);
 913   this->inputs_.start_group();
 914 }
 915
 916 // Handle the --end-group option.
 917
 918 void
 919 Command_line::end_group(const char* arg)
 920 {
 921   if (!this->inputs_.in_group())
 922     this->usage(_("group end without group start"), arg);
 923   this->inputs_.end_group();
 924 }
 925
 926 // Report a usage error.  */
 927
 928 void
 929 Command_line::usage()
 930 {
 931   fprintf(stderr,
 932           _("%s: use the --help option for usage information\n"),
 933           program_name);
 934   ::exit(1);
 935 }
 936
 937 void
 938 Command_line::usage(const char* msg, const char *opt)
 939 {
 940   fprintf(stderr,
 941           _("%s: %s: %s\n"),
 942           program_name, opt, msg);
 943   this->usage();
 944 }
 945
 946 void
 947 Command_line::usage(const char* msg, char opt)
 948 {
 949   fprintf(stderr,
 950           _("%s: -%c: %s\n"),
 951           program_name, opt, msg);
 952   this->usage();
 953 }
 954
 955 } // End namespace gold.