gold/options.h

   1 // options.h -- handle command line options for gold  -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008 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 // Command_line
  24 //   Holds everything we get from the command line.
  25 // General_options (from Command_line::options())
  26 //   Options which are not position dependent.
  27 // Input_argument (from Command_line::inputs())
  28 //   The list of input files, including -l options.
  29 // Position_dependent_options (from Input_argument::options())
  30 //   Position dependent options which apply to this argument.
  31
  32 #ifndef GOLD_OPTIONS_H
  33 #define GOLD_OPTIONS_H
  34
  35 #include <cstdlib>
  36 #include <list>
  37 #include <string>
  38 #include <vector>
  39
  40 #include "script.h"
  41
  42 namespace gold
  43 {
  44
  45 class Command_line;
  46 class Input_file_group;
  47 class Position_dependent_options;
  48
  49 namespace options
  50 {
  51
  52 class Command_line_options;
  53 struct One_option;
  54 struct One_z_option;
  55 struct One_debug_option;
  56
  57 } // End namespace gold::options.
  58
  59 // A directory to search.  For each directory we record whether it is
  60 // in the sysroot.  We need to know this so that, if a linker script
  61 // is found within the sysroot, we will apply the sysroot to any files
  62 // named by that script.
  63
  64 class Search_directory
  65 {
  66  public:
  67   // We need a default constructor because we put this in a
  68   // std::vector.
  69   Search_directory()
  70     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
  71   { }
  72
  73   // This is the usual constructor.
  74   Search_directory(const char* name, bool put_in_sysroot)
  75     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
  76   { gold_assert(!this->name_.empty()); }
  77
  78   // This is called if we have a sysroot.  The sysroot is prefixed to
  79   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
  80   // set to true for any enries which are in the sysroot (this will
  81   // naturally include any entries for which put_in_sysroot_ is true).
  82   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
  83   // passing SYSROOT to lrealpath.
  84   void
  85   add_sysroot(const char* sysroot, const char* canonical_sysroot);
  86
  87   // Get the directory name.
  88   const std::string&
  89   name() const
  90   { return this->name_; }
  91
  92   // Return whether this directory is in the sysroot.
  93   bool
  94   is_in_sysroot() const
  95   { return this->is_in_sysroot_; }
  96
  97  private:
  98   std::string name_;
  99   bool put_in_sysroot_;
 100   bool is_in_sysroot_;
 101 };
 102
 103 // The position independent options which apply to the whole link.
 104 // There are a lot of them.
 105
 106 class General_options
 107 {
 108  public:
 109   General_options(Script_options*);
 110
 111   // -e: set entry address.
 112   const char*
 113   entry() const
 114   { return this->script_options_->entry(); }
 115
 116   // -E: export dynamic symbols.
 117   bool
 118   export_dynamic() const
 119   { return this->export_dynamic_; }
 120
 121   // -h: shared library name.
 122   const char*
 123   soname() const
 124   { return this->soname_; }
 125
 126   // -I: dynamic linker name.
 127   const char*
 128   dynamic_linker() const
 129   { return this->dynamic_linker_; }
 130
 131   // -L: Library search path.
 132   typedef std::vector<Search_directory> Dir_list;
 133
 134   const Dir_list&
 135   search_path() const
 136   { return this->search_path_; }
 137
 138   // -O: optimization level (0: don't try to optimize output size).
 139   int
 140   optimization_level() const
 141   { return this->optimization_level_; }
 142
 143   // -o: Output file name.
 144   const char*
 145   output_file_name() const
 146   { return this->output_file_name_; }
 147
 148   // -r: Whether we are doing a relocatable link.
 149   bool
 150   is_relocatable() const
 151   { return this->is_relocatable_; }
 152
 153   // -s: Strip all symbols.
 154   bool
 155   strip_all() const
 156   { return this->strip_ == STRIP_ALL; }
 157
 158   // -S: Strip debugging information.
 159   bool
 160   strip_debug() const
 161   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 162
 163   // --strip-debug-gdb: strip only debugging information that's not
 164   // used by gdb (at least, for gdb versions <= 6.7).
 165   bool
 166   strip_debug_gdb() const
 167   { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
 168
 169   // --allow-shlib-undefined: do not warn about unresolved symbols in
 170   // --shared libraries.
 171   bool
 172   allow_shlib_undefined() const
 173   { return this->allow_shlib_undefined_; }
 174
 175   // -Bsymbolic: bind defined symbols locally.
 176   bool
 177   symbolic() const
 178   { return this->symbolic_; }
 179
 180   // --compress-debug-sections: compress .debug_* sections in the
 181   // output file using the given compression method.  This is useful
 182   // when the tools (such as gdb) support compressed sections.
 183   bool
 184   compress_debug_sections() const
 185   { return this->compress_debug_sections_ != NO_COMPRESSION; }
 186
 187   bool
 188   zlib_compress_debug_sections() const
 189   { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
 190
 191   // --demangle: demangle C++ symbols in our log messages.
 192   bool
 193   demangle() const
 194   { return this->demangle_; }
 195
 196   // --detect-odr-violations: Whether to search for One Defn Rule violations.
 197   bool
 198   detect_odr_violations() const
 199   { return this->detect_odr_violations_; }
 200
 201   // --eh-frame-hdr: Whether to generate an exception frame header.
 202   bool
 203   create_eh_frame_hdr() const
 204   { return this->create_eh_frame_hdr_; }
 205
 206   // --rpath: The runtime search path.
 207   const Dir_list&
 208   rpath() const
 209   { return this->rpath_; }
 210
 211   // --rpath-link: The link time search patch for shared libraries.
 212   const Dir_list&
 213   rpath_link() const
 214   { return this->rpath_link_; }
 215
 216   // --shared: Whether generating a shared object.
 217   bool
 218   is_shared() const
 219   { return this->is_shared_; }
 220
 221   // --static: Whether doing a static link.
 222   bool
 223   is_static() const
 224   { return this->is_static_; }
 225
 226   // --stats: Print resource usage statistics.
 227   bool
 228   print_stats() const
 229   { return this->print_stats_; }
 230
 231   // --sysroot: The system root of a cross-linker.
 232   const std::string&
 233   sysroot() const
 234   { return this->sysroot_; }
 235
 236   // -Ttext: The address of the .text section
 237   uint64_t
 238   text_segment_address() const
 239   { return this->text_segment_address_; }
 240
 241   // Whether -Ttext was used.
 242   bool
 243   user_set_text_segment_address() const
 244   { return this->text_segment_address_ != -1U; }
 245
 246   // --threads: Whether to use threads.
 247   bool
 248   threads() const
 249   { return this->threads_; }
 250
 251   // --thread-count-initial: Threads to use in initial pass.
 252   int
 253   thread_count_initial() const
 254   { return this->thread_count_initial_; }
 255
 256   // --thread-count-middle: Threads to use in middle pass.
 257   int
 258   thread_count_middle() const
 259   { return this->thread_count_middle_; }
 260
 261   // --thread-count-final: Threads to use in final pass.
 262   int
 263   thread_count_final() const
 264   { return this->thread_count_final_; }
 265
 266   // -z execstack, -z noexecstack
 267   bool
 268   is_execstack_set() const
 269   { return this->execstack_ != EXECSTACK_FROM_INPUT; }
 270
 271   bool
 272   is_stack_executable() const
 273   { return this->execstack_ == EXECSTACK_YES; }
 274
 275   // --debug
 276   unsigned int
 277   debug() const
 278   { return this->debug_; }
 279
 280   // Return the options which may be set from a linker script.
 281   Script_options*
 282   script_options()
 283   { return this->script_options_; }
 284
 285   const Script_options*
 286   script_options() const
 287   { return this->script_options_; }
 288
 289  private:
 290   // Don't copy this structure.
 291   General_options(const General_options&);
 292   General_options& operator=(const General_options&);
 293
 294   friend class Command_line;
 295   friend class options::Command_line_options;
 296
 297   // Which symbols to strip.
 298   enum Strip
 299   {
 300     // Don't strip any symbols.
 301     STRIP_NONE,
 302     // Strip all symbols.
 303     STRIP_ALL,
 304     // Strip debugging information.
 305     STRIP_DEBUG,
 306     // Strip debugging information that's not used by gdb (at least <= 6.7)
 307     STRIP_DEBUG_UNUSED_BY_GDB
 308   };
 309
 310   // Whether to mark the stack as executable.
 311   enum Execstack
 312   {
 313     // Not set on command line.
 314     EXECSTACK_FROM_INPUT,
 315     // Mark the stack as executable.
 316     EXECSTACK_YES,
 317     // Mark the stack as not executable.
 318     EXECSTACK_NO
 319   };
 320
 321   // What compression method to use
 322   enum CompressionMethod
 323   {
 324     NO_COMPRESSION,
 325     ZLIB_COMPRESSION,
 326   };
 327
 328   void
 329   set_entry(const char* arg)
 330   { this->script_options_->set_entry(arg, strlen(arg)); }
 331
 332   void
 333   set_export_dynamic()
 334   { this->export_dynamic_ = true; }
 335
 336   void
 337   set_soname(const char* arg)
 338   { this->soname_ = arg; }
 339
 340   void
 341   set_dynamic_linker(const char* arg)
 342   { this->dynamic_linker_ = arg; }
 343
 344   void
 345   add_to_search_path(const char* arg)
 346   { this->search_path_.push_back(Search_directory(arg, false)); }
 347
 348   void
 349   add_to_search_path_with_sysroot(const char* arg)
 350   { this->search_path_.push_back(Search_directory(arg, true)); }
 351
 352   void
 353   set_optimization_level(const char* arg)
 354   {
 355     char* endptr;
 356     this->optimization_level_ = strtol(arg, &endptr, 0);
 357     if (*endptr != '\0' || this->optimization_level_ < 0)
 358       gold_fatal(_("invalid optimization level: %s"), arg);
 359   }
 360
 361   void
 362   set_output_file_name(const char* arg)
 363   { this->output_file_name_ = arg; }
 364
 365   void
 366   set_relocatable()
 367   { this->is_relocatable_ = true; }
 368
 369   void
 370   set_strip_all()
 371   { this->strip_ = STRIP_ALL; }
 372
 373   // Note: normalize_options() depends on the fact that this turns off
 374   // STRIP_ALL if it were already set.
 375   void
 376   set_strip_debug()
 377   { this->strip_ = STRIP_DEBUG; }
 378
 379   void
 380   set_strip_debug_gdb()
 381   { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
 382
 383   void
 384   set_allow_shlib_undefined()
 385   { this->allow_shlib_undefined_ = true; }
 386
 387   void
 388   set_no_allow_shlib_undefined()
 389   { this->allow_shlib_undefined_ = false; }
 390
 391   void
 392   set_symbolic()
 393   { this->symbolic_ = true; }
 394
 395   void set_compress_debug_sections(const char* arg)
 396   {
 397     if (strcmp(arg, "none") == 0)
 398       this->compress_debug_sections_ = NO_COMPRESSION;
 399 #ifdef HAVE_ZLIB_H
 400     else if (strcmp(arg, "zlib") == 0)
 401       this->compress_debug_sections_ = ZLIB_COMPRESSION;
 402 #endif
 403     else
 404       gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
 405                  arg);
 406   }
 407
 408   void
 409   define_symbol(const char* arg);
 410
 411   void
 412   set_demangle()
 413   { this->demangle_ = true; }
 414
 415   void
 416   clear_demangle()
 417   { this->demangle_ = false; }
 418
 419   void
 420   set_detect_odr_violations()
 421   { this->detect_odr_violations_ = true; }
 422
 423   void
 424   set_create_eh_frame_hdr()
 425   { this->create_eh_frame_hdr_ = true; }
 426
 427   void
 428   add_to_rpath(const char* arg)
 429   { this->rpath_.push_back(Search_directory(arg, false)); }
 430
 431   void
 432   add_to_rpath_link(const char* arg)
 433   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 434
 435   void
 436   set_shared()
 437   { this->is_shared_ = true; }
 438
 439   void
 440   set_static()
 441   { this->is_static_ = true; }
 442
 443   void
 444   set_stats()
 445   { this->print_stats_ = true; }
 446
 447   void
 448   set_sysroot(const char* arg)
 449   { this->sysroot_ = arg; }
 450
 451   void
 452   set_text_segment_address(const char* arg)
 453   {
 454     char* endptr;
 455     this->text_segment_address_ = strtoull(arg, &endptr, 0);
 456     if (*endptr != '\0'
 457         || this->text_segment_address_ == -1U)
 458       gold_fatal(_("invalid argument to -Ttext: %s"), arg);
 459   }
 460
 461   int
 462   parse_thread_count(const char* arg)
 463   {
 464     char* endptr;
 465     const int count = strtol(arg, &endptr, 0);
 466     if (*endptr != '\0' || count < 0)
 467       gold_fatal(_("invalid thread count: %s"), arg);
 468     return count;
 469   }
 470
 471   void
 472   set_threads()
 473   {
 474 #ifndef ENABLE_THREADS
 475     gold_fatal(_("--threads not supported"));
 476 #endif
 477     this->threads_ = true;
 478   }
 479
 480   void
 481   clear_threads()
 482   { this->threads_ = false; }
 483
 484   void
 485   set_thread_count(const char* arg)
 486   {
 487     int count = this->parse_thread_count(arg);
 488     this->thread_count_initial_ = count;
 489     this->thread_count_middle_ = count;
 490     this->thread_count_final_ = count;
 491   }
 492
 493   void
 494   set_thread_count_initial(const char* arg)
 495   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 496
 497   void
 498   set_thread_count_middle(const char* arg)
 499   { this->thread_count_middle_ = this->parse_thread_count(arg); }
 500
 501   void
 502   set_thread_count_final(const char* arg)
 503   { this->thread_count_final_ = this->parse_thread_count(arg); }
 504
 505   void
 506   ignore(const char*)
 507   { }
 508
 509   void
 510   set_execstack()
 511   { this->execstack_ = EXECSTACK_YES; }
 512
 513   void
 514   set_noexecstack()
 515   { this->execstack_ = EXECSTACK_NO; }
 516
 517   void
 518   set_debug(unsigned int flags)
 519   { this->debug_ = flags; }
 520
 521   // Handle the -z option.
 522   void
 523   handle_z_option(const char*);
 524
 525   // Handle the --debug option.
 526   void
 527   handle_debug_option(const char*);
 528
 529   // Apply any sysroot to the directory lists.
 530   void
 531   add_sysroot();
 532
 533   bool export_dynamic_;
 534   const char* soname_;
 535   const char* dynamic_linker_;
 536   Dir_list search_path_;
 537   int optimization_level_;
 538   const char* output_file_name_;
 539   bool is_relocatable_;
 540   Strip strip_;
 541   bool allow_shlib_undefined_;
 542   bool symbolic_;
 543   CompressionMethod compress_debug_sections_;
 544   bool demangle_;
 545   bool detect_odr_violations_;
 546   bool create_eh_frame_hdr_;
 547   Dir_list rpath_;
 548   Dir_list rpath_link_;
 549   bool is_shared_;
 550   bool is_static_;
 551   bool print_stats_;
 552   std::string sysroot_;
 553   uint64_t text_segment_address_;
 554   bool threads_;
 555   int thread_count_initial_;
 556   int thread_count_middle_;
 557   int thread_count_final_;
 558   Execstack execstack_;
 559   unsigned int debug_;
 560   // Some options can also be set from linker scripts.  Those are
 561   // stored here.
 562   Script_options* script_options_;
 563 };
 564
 565 // The current state of the position dependent options.
 566
 567 class Position_dependent_options
 568 {
 569  public:
 570   Position_dependent_options();
 571
 572   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 573   // -rather than a shared object.
 574   bool
 575   do_static_search() const
 576   { return this->do_static_search_; }
 577
 578   // --as-needed: Whether to add a DT_NEEDED argument only if the
 579   // dynamic object is used.
 580   bool
 581   as_needed() const
 582   { return this->as_needed_; }
 583
 584   // --whole-archive: Whether to include the entire contents of an
 585   // --archive.
 586   bool
 587   include_whole_archive() const
 588   { return this->include_whole_archive_; }
 589
 590   void
 591   set_static_search()
 592   { this->do_static_search_ = true; }
 593
 594   void
 595   set_dynamic_search()
 596   { this->do_static_search_ = false; }
 597
 598   void
 599   set_as_needed()
 600   { this->as_needed_ = true; }
 601
 602   void
 603   clear_as_needed()
 604   { this->as_needed_ = false; }
 605
 606   void
 607   set_whole_archive()
 608   { this->include_whole_archive_ = true; }
 609
 610   void
 611   clear_whole_archive()
 612   { this->include_whole_archive_ = false; }
 613
 614  private:
 615   bool do_static_search_;
 616   bool as_needed_;
 617   bool include_whole_archive_;
 618 };
 619
 620 // A single file or library argument from the command line.
 621
 622 class Input_file_argument
 623 {
 624  public:
 625   // name: file name or library name
 626   // is_lib: true if name is a library name: that is, emits the leading
 627   //         "lib" and trailing ".so"/".a" from the name
 628   // extra_search_path: an extra directory to look for the file, prior
 629   //         to checking the normal library search path.  If this is "",
 630   //         then no extra directory is added.
 631   // options: The position dependent options at this point in the
 632   //         command line, such as --whole-archive.
 633   Input_file_argument()
 634     : name_(), is_lib_(false), extra_search_path_(""), options_()
 635   { }
 636
 637   Input_file_argument(const char* name, bool is_lib,
 638                       const char* extra_search_path,
 639                       const Position_dependent_options& options)
 640     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 641       options_(options)
 642   { }
 643
 644   const char*
 645   name() const
 646   { return this->name_.c_str(); }
 647
 648   const Position_dependent_options&
 649   options() const
 650   { return this->options_; }
 651
 652   bool
 653   is_lib() const
 654   { return this->is_lib_; }
 655
 656   const char*
 657   extra_search_path() const
 658   {
 659     return (this->extra_search_path_.empty()
 660             ? NULL
 661             : this->extra_search_path_.c_str());
 662   }
 663
 664   // Return whether this file may require a search using the -L
 665   // options.
 666   bool
 667   may_need_search() const
 668   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 669
 670  private:
 671   // We use std::string, not const char*, here for convenience when
 672   // using script files, so that we do not have to preserve the string
 673   // in that case.
 674   std::string name_;
 675   bool is_lib_;
 676   std::string extra_search_path_;
 677   Position_dependent_options options_;
 678 };
 679
 680 // A file or library, or a group, from the command line.
 681
 682 class Input_argument
 683 {
 684  public:
 685   // Create a file or library argument.
 686   explicit Input_argument(Input_file_argument file)
 687     : is_file_(true), file_(file), group_(NULL)
 688   { }
 689
 690   // Create a group argument.
 691   explicit Input_argument(Input_file_group* group)
 692     : is_file_(false), group_(group)
 693   { }
 694
 695   // Return whether this is a file.
 696   bool
 697   is_file() const
 698   { return this->is_file_; }
 699
 700   // Return whether this is a group.
 701   bool
 702   is_group() const
 703   { return !this->is_file_; }
 704
 705   // Return the information about the file.
 706   const Input_file_argument&
 707   file() const
 708   {
 709     gold_assert(this->is_file_);
 710     return this->file_;
 711   }
 712
 713   // Return the information about the group.
 714   const Input_file_group*
 715   group() const
 716   {
 717     gold_assert(!this->is_file_);
 718     return this->group_;
 719   }
 720
 721   Input_file_group*
 722   group()
 723   {
 724     gold_assert(!this->is_file_);
 725     return this->group_;
 726   }
 727
 728  private:
 729   bool is_file_;
 730   Input_file_argument file_;
 731   Input_file_group* group_;
 732 };
 733
 734 // A group from the command line.  This is a set of arguments within
 735 // --start-group ... --end-group.
 736
 737 class Input_file_group
 738 {
 739  public:
 740   typedef std::vector<Input_argument> Files;
 741   typedef Files::const_iterator const_iterator;
 742
 743   Input_file_group()
 744     : files_()
 745   { }
 746
 747   // Add a file to the end of the group.
 748   void
 749   add_file(const Input_file_argument& arg)
 750   { this->files_.push_back(Input_argument(arg)); }
 751
 752   // Iterators to iterate over the group contents.
 753
 754   const_iterator
 755   begin() const
 756   { return this->files_.begin(); }
 757
 758   const_iterator
 759   end() const
 760   { return this->files_.end(); }
 761
 762  private:
 763   Files files_;
 764 };
 765
 766 // A list of files from the command line or a script.
 767
 768 class Input_arguments
 769 {
 770  public:
 771   typedef std::vector<Input_argument> Input_argument_list;
 772   typedef Input_argument_list::const_iterator const_iterator;
 773
 774   Input_arguments()
 775     : input_argument_list_(), in_group_(false)
 776   { }
 777
 778   // Add a file.
 779   void
 780   add_file(const Input_file_argument& arg);
 781
 782   // Start a group (the --start-group option).
 783   void
 784   start_group();
 785
 786   // End a group (the --end-group option).
 787   void
 788   end_group();
 789
 790   // Return whether we are currently in a group.
 791   bool
 792   in_group() const
 793   { return this->in_group_; }
 794
 795   // The number of entries in the list.
 796   int
 797   size() const
 798   { return this->input_argument_list_.size(); }
 799
 800   // Iterators to iterate over the list of input files.
 801
 802   const_iterator
 803   begin() const
 804   { return this->input_argument_list_.begin(); }
 805
 806   const_iterator
 807   end() const
 808   { return this->input_argument_list_.end(); }
 809
 810   // Return whether the list is empty.
 811   bool
 812   empty() const
 813   { return this->input_argument_list_.empty(); }
 814
 815  private:
 816   Input_argument_list input_argument_list_;
 817   bool in_group_;
 818 };
 819
 820 // All the information read from the command line.
 821
 822 class Command_line
 823 {
 824  public:
 825   typedef Input_arguments::const_iterator const_iterator;
 826
 827   Command_line(Script_options*);
 828
 829   // Process the command line options.  This will exit with an
 830   // appropriate error message if an unrecognized option is seen.
 831   void
 832   process(int argc, char** argv);
 833
 834   // Process one command-line option.  This takes the index of argv to
 835   // process, and returns the index for the next option.
 836   int
 837   process_one_option(int argc, char** argv, int i, bool* no_more_options);
 838
 839   // Handle a -l option.
 840   int
 841   process_l_option(int, char**, char*, bool);
 842
 843   // Handle a --start-group option.
 844   void
 845   start_group(const char* arg);
 846
 847   // Handle a --end-group option.
 848   void
 849   end_group(const char* arg);
 850
 851   // Get an option argument--a helper function for special processing.
 852   const char*
 853   get_special_argument(const char* longname, int argc, char** argv,
 854                        const char* arg, bool long_option,
 855                        int *pret);
 856
 857   // Get the general options.
 858   const General_options&
 859   options() const
 860   { return this->options_; }
 861
 862   // Get the position dependent options.
 863   const Position_dependent_options&
 864   position_dependent_options() const
 865   { return this->position_options_; }
 866
 867   // Get the options which may be set from a linker script.
 868   Script_options*
 869   script_options()
 870   { return this->options_.script_options(); }
 871
 872   const Script_options*
 873   script_options() const
 874   { return this->options_.script_options(); }
 875
 876   // The number of input files.
 877   int
 878   number_of_input_files() const
 879   { return this->inputs_.size(); }
 880
 881   // Iterators to iterate over the list of input files.
 882
 883   const_iterator
 884   begin() const
 885   { return this->inputs_.begin(); }
 886
 887   const_iterator
 888   end() const
 889   { return this->inputs_.end(); }
 890
 891  private:
 892   Command_line(const Command_line&);
 893   Command_line& operator=(const Command_line&);
 894
 895   // Report usage error.
 896   void
 897   usage() ATTRIBUTE_NORETURN;
 898   void
 899   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 900   void
 901   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
 902
 903   // Apply a command line option.
 904   void
 905   apply_option(const gold::options::One_option&, const char*);
 906
 907   // Add a file.
 908   void
 909   add_file(const char* name, bool is_lib);
 910
 911   // Examine the result of processing the command-line, and verify
 912   // the flags do not contradict each other or are otherwise illegal.
 913   void
 914   normalize_options();
 915
 916   General_options options_;
 917   Position_dependent_options position_options_;
 918   Input_arguments inputs_;
 919 };
 920
 921 } // End namespace gold.
 922
 923 #endif // !defined(GOLD_OPTIONS_H)