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   {
  77     if (this->name_.empty())
  78       this->name_ = ".";
  79   }
  80
  81   // This is called if we have a sysroot.  The sysroot is prefixed to
  82   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
  83   // set to true for any enries which are in the sysroot (this will
  84   // naturally include any entries for which put_in_sysroot_ is true).
  85   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
  86   // passing SYSROOT to lrealpath.
  87   void
  88   add_sysroot(const char* sysroot, const char* canonical_sysroot);
  89
  90   // Get the directory name.
  91   const std::string&
  92   name() const
  93   { return this->name_; }
  94
  95   // Return whether this directory is in the sysroot.
  96   bool
  97   is_in_sysroot() const
  98   { return this->is_in_sysroot_; }
  99
 100  private:
 101   std::string name_;
 102   bool put_in_sysroot_;
 103   bool is_in_sysroot_;
 104 };
 105
 106 // The position independent options which apply to the whole link.
 107 // There are a lot of them.
 108
 109 class General_options
 110 {
 111  public:
 112   General_options(Script_options*);
 113
 114   // -e: set entry address.
 115   const char*
 116   entry() const
 117   { return this->script_options_->entry(); }
 118
 119   // -E: export dynamic symbols.
 120   bool
 121   export_dynamic() const
 122   { return this->export_dynamic_; }
 123
 124   // -h: shared library name.
 125   const char*
 126   soname() const
 127   { return this->soname_; }
 128
 129   // -I: dynamic linker name.
 130   const char*
 131   dynamic_linker() const
 132   { return this->dynamic_linker_; }
 133
 134   // -L: Library search path.
 135   typedef std::vector<Search_directory> Dir_list;
 136
 137   const Dir_list&
 138   search_path() const
 139   { return this->search_path_; }
 140
 141   // -O: optimization level (0: don't try to optimize output size).
 142   int
 143   optimization_level() const
 144   { return this->optimization_level_; }
 145
 146   // -o: Output file name.
 147   const char*
 148   output_file_name() const
 149   { return this->output_file_name_; }
 150
 151   // --oformat: Output format.
 152
 153   enum Output_format
 154   {
 155     // Ordinary ELF.
 156     OUTPUT_FORMAT_ELF,
 157     // Straight binary format.
 158     OUTPUT_FORMAT_BINARY
 159   };
 160
 161   Output_format
 162   output_format() const
 163   { return this->output_format_; }
 164
 165   // -r: Whether we are doing a relocatable link.
 166   bool
 167   is_relocatable() const
 168   { return this->is_relocatable_; }
 169
 170   // -s: Strip all symbols.
 171   bool
 172   strip_all() const
 173   { return this->strip_ == STRIP_ALL; }
 174
 175   // -S: Strip debugging information.
 176   bool
 177   strip_debug() const
 178   { return this->strip_ == STRIP_ALL || this->strip_ == STRIP_DEBUG; }
 179
 180   // --strip-debug-gdb: strip only debugging information that's not
 181   // used by gdb (at least, for gdb versions <= 6.7).
 182   bool
 183   strip_debug_gdb() const
 184   { return this->strip_debug() || this->strip_ == STRIP_DEBUG_UNUSED_BY_GDB; }
 185
 186   // --allow-shlib-undefined: do not warn about unresolved symbols in
 187   // --shared libraries.
 188   bool
 189   allow_shlib_undefined() const
 190   { return this->allow_shlib_undefined_; }
 191
 192   // -Bsymbolic: bind defined symbols locally.
 193   bool
 194   symbolic() const
 195   { return this->symbolic_; }
 196
 197   // --compress-debug-sections: compress .debug_* sections in the
 198   // output file using the given compression method.  This is useful
 199   // when the tools (such as gdb) support compressed sections.
 200   bool
 201   compress_debug_sections() const
 202   { return this->compress_debug_sections_ != NO_COMPRESSION; }
 203
 204   bool
 205   zlib_compress_debug_sections() const
 206   { return this->compress_debug_sections_ == ZLIB_COMPRESSION; }
 207
 208   // --demangle: demangle C++ symbols in our log messages.
 209   bool
 210   demangle() const
 211   { return this->demangle_; }
 212
 213   // --detect-odr-violations: Whether to search for One Defn Rule violations.
 214   bool
 215   detect_odr_violations() const
 216   { return this->detect_odr_violations_; }
 217
 218   // --eh-frame-hdr: Whether to generate an exception frame header.
 219   bool
 220   create_eh_frame_hdr() const
 221   { return this->create_eh_frame_hdr_; }
 222
 223   // --rpath: The runtime search path.
 224   const Dir_list&
 225   rpath() const
 226   { return this->rpath_; }
 227
 228   // --rpath-link: The link time search patch for shared libraries.
 229   const Dir_list&
 230   rpath_link() const
 231   { return this->rpath_link_; }
 232
 233   // --shared: Whether generating a shared object.
 234   bool
 235   is_shared() const
 236   { return this->is_shared_; }
 237
 238   // --static: Whether doing a static link.
 239   bool
 240   is_static() const
 241   { return this->is_static_; }
 242
 243   // --stats: Print resource usage statistics.
 244   bool
 245   print_stats() const
 246   { return this->print_stats_; }
 247
 248   // --sysroot: The system root of a cross-linker.
 249   const std::string&
 250   sysroot() const
 251   { return this->sysroot_; }
 252
 253   // --version-script: The version script to apply if --shared is true.
 254   const Version_script_info&
 255   version_script() const
 256   { return *this->script_options_->version_script_info(); }
 257
 258   // -Ttext: The address of the .text section
 259   uint64_t
 260   text_segment_address() const
 261   { return this->text_segment_address_; }
 262
 263   // Whether -Ttext was used.
 264   bool
 265   user_set_text_segment_address() const
 266   { return this->text_segment_address_ != -1U; }
 267
 268   // --threads: Whether to use threads.
 269   bool
 270   threads() const
 271   { return this->threads_; }
 272
 273   // --thread-count-initial: Threads to use in initial pass.
 274   int
 275   thread_count_initial() const
 276   { return this->thread_count_initial_; }
 277
 278   // --thread-count-middle: Threads to use in middle pass.
 279   int
 280   thread_count_middle() const
 281   { return this->thread_count_middle_; }
 282
 283   // --thread-count-final: Threads to use in final pass.
 284   int
 285   thread_count_final() const
 286   { return this->thread_count_final_; }
 287
 288   // -z execstack, -z noexecstack
 289   bool
 290   is_execstack_set() const
 291   { return this->execstack_ != EXECSTACK_FROM_INPUT; }
 292
 293   bool
 294   is_stack_executable() const
 295   { return this->execstack_ == EXECSTACK_YES; }
 296
 297   // --debug
 298   unsigned int
 299   debug() const
 300   { return this->debug_; }
 301
 302   // Return the options which may be set from a linker script.
 303   Script_options*
 304   script_options()
 305   { return this->script_options_; }
 306
 307   const Script_options*
 308   script_options() const
 309   { return this->script_options_; }
 310
 311  private:
 312   // Don't copy this structure.
 313   General_options(const General_options&);
 314   General_options& operator=(const General_options&);
 315
 316   friend class Command_line;
 317   friend class options::Command_line_options;
 318
 319   // Which symbols to strip.
 320   enum Strip
 321   {
 322     // Don't strip any symbols.
 323     STRIP_NONE,
 324     // Strip all symbols.
 325     STRIP_ALL,
 326     // Strip debugging information.
 327     STRIP_DEBUG,
 328     // Strip debugging information that's not used by gdb (at least <= 6.7)
 329     STRIP_DEBUG_UNUSED_BY_GDB
 330   };
 331
 332   // Whether to mark the stack as executable.
 333   enum Execstack
 334   {
 335     // Not set on command line.
 336     EXECSTACK_FROM_INPUT,
 337     // Mark the stack as executable.
 338     EXECSTACK_YES,
 339     // Mark the stack as not executable.
 340     EXECSTACK_NO
 341   };
 342
 343   // What compression method to use
 344   enum CompressionMethod
 345   {
 346     NO_COMPRESSION,
 347     ZLIB_COMPRESSION,
 348   };
 349
 350   void
 351   set_entry(const char* arg)
 352   { this->script_options_->set_entry(arg, strlen(arg)); }
 353
 354   void
 355   set_export_dynamic()
 356   { this->export_dynamic_ = true; }
 357
 358   void
 359   set_soname(const char* arg)
 360   { this->soname_ = arg; }
 361
 362   void
 363   set_dynamic_linker(const char* arg)
 364   { this->dynamic_linker_ = arg; }
 365
 366   void
 367   add_to_search_path(const char* arg)
 368   { this->search_path_.push_back(Search_directory(arg, false)); }
 369
 370   void
 371   add_to_search_path_with_sysroot(const char* arg)
 372   { this->search_path_.push_back(Search_directory(arg, true)); }
 373
 374   void
 375   set_optimization_level(const char* arg)
 376   {
 377     char* endptr;
 378     this->optimization_level_ = strtol(arg, &endptr, 0);
 379     if (*endptr != '\0' || this->optimization_level_ < 0)
 380       gold_fatal(_("invalid optimization level: %s"), arg);
 381   }
 382
 383   void
 384   set_output_file_name(const char* arg)
 385   { this->output_file_name_ = arg; }
 386
 387   void
 388   set_output_format(const char*);
 389
 390   void
 391   set_relocatable()
 392   { this->is_relocatable_ = true; }
 393
 394   void
 395   set_strip_all()
 396   { this->strip_ = STRIP_ALL; }
 397
 398   // Note: normalize_options() depends on the fact that this turns off
 399   // STRIP_ALL if it were already set.
 400   void
 401   set_strip_debug()
 402   { this->strip_ = STRIP_DEBUG; }
 403
 404   void
 405   set_strip_debug_gdb()
 406   { this->strip_ = STRIP_DEBUG_UNUSED_BY_GDB; }
 407
 408   void
 409   set_allow_shlib_undefined()
 410   { this->allow_shlib_undefined_ = true; }
 411
 412   void
 413   set_no_allow_shlib_undefined()
 414   { this->allow_shlib_undefined_ = false; }
 415
 416   void
 417   set_symbolic()
 418   { this->symbolic_ = true; }
 419
 420   void set_compress_debug_sections(const char* arg)
 421   {
 422     if (strcmp(arg, "none") == 0)
 423       this->compress_debug_sections_ = NO_COMPRESSION;
 424 #ifdef HAVE_ZLIB_H
 425     else if (strcmp(arg, "zlib") == 0)
 426       this->compress_debug_sections_ = ZLIB_COMPRESSION;
 427 #endif
 428     else
 429       gold_fatal(_("unsupported argument to --compress-debug-sections: %s"),
 430                  arg);
 431   }
 432
 433   void
 434   define_symbol(const char* arg);
 435
 436   void
 437   set_demangle()
 438   { this->demangle_ = true; }
 439
 440   void
 441   clear_demangle()
 442   { this->demangle_ = false; }
 443
 444   void
 445   set_detect_odr_violations()
 446   { this->detect_odr_violations_ = true; }
 447
 448   void
 449   set_create_eh_frame_hdr()
 450   { this->create_eh_frame_hdr_ = true; }
 451
 452   void
 453   add_to_rpath(const char* arg)
 454   { this->rpath_.push_back(Search_directory(arg, false)); }
 455
 456   void
 457   add_to_rpath_link(const char* arg)
 458   { this->rpath_link_.push_back(Search_directory(arg, false)); }
 459
 460   void
 461   set_shared()
 462   { this->is_shared_ = true; }
 463
 464   void
 465   set_static()
 466   { this->is_static_ = true; }
 467
 468   void
 469   set_stats()
 470   { this->print_stats_ = true; }
 471
 472   void
 473   set_sysroot(const char* arg)
 474   { this->sysroot_ = arg; }
 475
 476   void
 477   set_text_segment_address(const char* arg)
 478   {
 479     char* endptr;
 480     this->text_segment_address_ = strtoull(arg, &endptr, 0);
 481     if (*endptr != '\0'
 482         || this->text_segment_address_ == -1U)
 483       gold_fatal(_("invalid argument to -Ttext: %s"), arg);
 484   }
 485
 486   int
 487   parse_thread_count(const char* arg)
 488   {
 489     char* endptr;
 490     const int count = strtol(arg, &endptr, 0);
 491     if (*endptr != '\0' || count < 0)
 492       gold_fatal(_("invalid thread count: %s"), arg);
 493     return count;
 494   }
 495
 496   void
 497   set_threads()
 498   {
 499 #ifndef ENABLE_THREADS
 500     gold_fatal(_("--threads not supported"));
 501 #endif
 502     this->threads_ = true;
 503   }
 504
 505   void
 506   clear_threads()
 507   { this->threads_ = false; }
 508
 509   void
 510   set_thread_count(const char* arg)
 511   {
 512     int count = this->parse_thread_count(arg);
 513     this->thread_count_initial_ = count;
 514     this->thread_count_middle_ = count;
 515     this->thread_count_final_ = count;
 516   }
 517
 518   void
 519   set_thread_count_initial(const char* arg)
 520   { this->thread_count_initial_ = this->parse_thread_count(arg); }
 521
 522   void
 523   set_thread_count_middle(const char* arg)
 524   { this->thread_count_middle_ = this->parse_thread_count(arg); }
 525
 526   void
 527   set_thread_count_final(const char* arg)
 528   { this->thread_count_final_ = this->parse_thread_count(arg); }
 529
 530   void
 531   ignore(const char*)
 532   { }
 533
 534   void
 535   set_execstack()
 536   { this->execstack_ = EXECSTACK_YES; }
 537
 538   void
 539   set_noexecstack()
 540   { this->execstack_ = EXECSTACK_NO; }
 541
 542   void
 543   set_debug(unsigned int flags)
 544   { this->debug_ = flags; }
 545
 546   // Handle the -z option.
 547   void
 548   handle_z_option(const char*);
 549
 550   // Handle the --debug option.
 551   void
 552   handle_debug_option(const char*);
 553
 554   // Apply any sysroot to the directory lists.
 555   void
 556   add_sysroot();
 557
 558   bool export_dynamic_;
 559   const char* soname_;
 560   const char* dynamic_linker_;
 561   Dir_list search_path_;
 562   int optimization_level_;
 563   const char* output_file_name_;
 564   Output_format output_format_;
 565   bool is_relocatable_;
 566   Strip strip_;
 567   bool allow_shlib_undefined_;
 568   bool symbolic_;
 569   CompressionMethod compress_debug_sections_;
 570   bool demangle_;
 571   bool detect_odr_violations_;
 572   bool create_eh_frame_hdr_;
 573   Dir_list rpath_;
 574   Dir_list rpath_link_;
 575   bool is_shared_;
 576   bool is_static_;
 577   bool print_stats_;
 578   std::string sysroot_;
 579   uint64_t text_segment_address_;
 580   bool threads_;
 581   int thread_count_initial_;
 582   int thread_count_middle_;
 583   int thread_count_final_;
 584   Execstack execstack_;
 585   unsigned int debug_;
 586   // Some options can also be set from linker scripts.  Those are
 587   // stored here.
 588   Script_options* script_options_;
 589 };
 590
 591 // The current state of the position dependent options.
 592
 593 class Position_dependent_options
 594 {
 595  public:
 596   Position_dependent_options();
 597
 598   // -Bdynamic/-Bstatic: Whether we are searching for a static archive
 599   // -rather than a shared object.
 600   bool
 601   do_static_search() const
 602   { return this->do_static_search_; }
 603
 604   // --as-needed: Whether to add a DT_NEEDED argument only if the
 605   // dynamic object is used.
 606   bool
 607   as_needed() const
 608   { return this->as_needed_; }
 609
 610   // --whole-archive: Whether to include the entire contents of an
 611   // --archive.
 612   bool
 613   include_whole_archive() const
 614   { return this->include_whole_archive_; }
 615
 616   void
 617   set_static_search()
 618   { this->do_static_search_ = true; }
 619
 620   void
 621   set_dynamic_search()
 622   { this->do_static_search_ = false; }
 623
 624   void
 625   set_as_needed()
 626   { this->as_needed_ = true; }
 627
 628   void
 629   clear_as_needed()
 630   { this->as_needed_ = false; }
 631
 632   void
 633   set_whole_archive()
 634   { this->include_whole_archive_ = true; }
 635
 636   void
 637   clear_whole_archive()
 638   { this->include_whole_archive_ = false; }
 639
 640  private:
 641   bool do_static_search_;
 642   bool as_needed_;
 643   bool include_whole_archive_;
 644 };
 645
 646 // A single file or library argument from the command line.
 647
 648 class Input_file_argument
 649 {
 650  public:
 651   // name: file name or library name
 652   // is_lib: true if name is a library name: that is, emits the leading
 653   //         "lib" and trailing ".so"/".a" from the name
 654   // extra_search_path: an extra directory to look for the file, prior
 655   //         to checking the normal library search path.  If this is "",
 656   //         then no extra directory is added.
 657   // just_symbols: whether this file only defines symbols.
 658   // options: The position dependent options at this point in the
 659   //         command line, such as --whole-archive.
 660   Input_file_argument()
 661     : name_(), is_lib_(false), extra_search_path_(""), just_symbols_(false),
 662       options_()
 663   { }
 664
 665   Input_file_argument(const char* name, bool is_lib,
 666                       const char* extra_search_path,
 667                       bool just_symbols,
 668                       const Position_dependent_options& options)
 669     : name_(name), is_lib_(is_lib), extra_search_path_(extra_search_path),
 670       just_symbols_(just_symbols), options_(options)
 671   { }
 672
 673   const char*
 674   name() const
 675   { return this->name_.c_str(); }
 676
 677   const Position_dependent_options&
 678   options() const
 679   { return this->options_; }
 680
 681   bool
 682   is_lib() const
 683   { return this->is_lib_; }
 684
 685   const char*
 686   extra_search_path() const
 687   {
 688     return (this->extra_search_path_.empty()
 689             ? NULL
 690             : this->extra_search_path_.c_str());
 691   }
 692
 693   // Return whether we should only read symbols from this file.
 694   bool
 695   just_symbols() const
 696   { return this->just_symbols_; }
 697
 698   // Return whether this file may require a search using the -L
 699   // options.
 700   bool
 701   may_need_search() const
 702   { return this->is_lib_ || !this->extra_search_path_.empty(); }
 703
 704  private:
 705   // We use std::string, not const char*, here for convenience when
 706   // using script files, so that we do not have to preserve the string
 707   // in that case.
 708   std::string name_;
 709   bool is_lib_;
 710   std::string extra_search_path_;
 711   bool just_symbols_;
 712   Position_dependent_options options_;
 713 };
 714
 715 // A file or library, or a group, from the command line.
 716
 717 class Input_argument
 718 {
 719  public:
 720   // Create a file or library argument.
 721   explicit Input_argument(Input_file_argument file)
 722     : is_file_(true), file_(file), group_(NULL)
 723   { }
 724
 725   // Create a group argument.
 726   explicit Input_argument(Input_file_group* group)
 727     : is_file_(false), group_(group)
 728   { }
 729
 730   // Return whether this is a file.
 731   bool
 732   is_file() const
 733   { return this->is_file_; }
 734
 735   // Return whether this is a group.
 736   bool
 737   is_group() const
 738   { return !this->is_file_; }
 739
 740   // Return the information about the file.
 741   const Input_file_argument&
 742   file() const
 743   {
 744     gold_assert(this->is_file_);
 745     return this->file_;
 746   }
 747
 748   // Return the information about the group.
 749   const Input_file_group*
 750   group() const
 751   {
 752     gold_assert(!this->is_file_);
 753     return this->group_;
 754   }
 755
 756   Input_file_group*
 757   group()
 758   {
 759     gold_assert(!this->is_file_);
 760     return this->group_;
 761   }
 762
 763  private:
 764   bool is_file_;
 765   Input_file_argument file_;
 766   Input_file_group* group_;
 767 };
 768
 769 // A group from the command line.  This is a set of arguments within
 770 // --start-group ... --end-group.
 771
 772 class Input_file_group
 773 {
 774  public:
 775   typedef std::vector<Input_argument> Files;
 776   typedef Files::const_iterator const_iterator;
 777
 778   Input_file_group()
 779     : files_()
 780   { }
 781
 782   // Add a file to the end of the group.
 783   void
 784   add_file(const Input_file_argument& arg)
 785   { this->files_.push_back(Input_argument(arg)); }
 786
 787   // Iterators to iterate over the group contents.
 788
 789   const_iterator
 790   begin() const
 791   { return this->files_.begin(); }
 792
 793   const_iterator
 794   end() const
 795   { return this->files_.end(); }
 796
 797  private:
 798   Files files_;
 799 };
 800
 801 // A list of files from the command line or a script.
 802
 803 class Input_arguments
 804 {
 805  public:
 806   typedef std::vector<Input_argument> Input_argument_list;
 807   typedef Input_argument_list::const_iterator const_iterator;
 808
 809   Input_arguments()
 810     : input_argument_list_(), in_group_(false)
 811   { }
 812
 813   // Add a file.
 814   void
 815   add_file(const Input_file_argument& arg);
 816
 817   // Start a group (the --start-group option).
 818   void
 819   start_group();
 820
 821   // End a group (the --end-group option).
 822   void
 823   end_group();
 824
 825   // Return whether we are currently in a group.
 826   bool
 827   in_group() const
 828   { return this->in_group_; }
 829
 830   // The number of entries in the list.
 831   int
 832   size() const
 833   { return this->input_argument_list_.size(); }
 834
 835   // Iterators to iterate over the list of input files.
 836
 837   const_iterator
 838   begin() const
 839   { return this->input_argument_list_.begin(); }
 840
 841   const_iterator
 842   end() const
 843   { return this->input_argument_list_.end(); }
 844
 845   // Return whether the list is empty.
 846   bool
 847   empty() const
 848   { return this->input_argument_list_.empty(); }
 849
 850  private:
 851   Input_argument_list input_argument_list_;
 852   bool in_group_;
 853 };
 854
 855 // All the information read from the command line.
 856
 857 class Command_line
 858 {
 859  public:
 860   typedef Input_arguments::const_iterator const_iterator;
 861
 862   Command_line(Script_options*);
 863
 864   // Process the command line options.  This will exit with an
 865   // appropriate error message if an unrecognized option is seen.
 866   void
 867   process(int argc, char** argv);
 868
 869   // Process one command-line option.  This takes the index of argv to
 870   // process, and returns the index for the next option.
 871   int
 872   process_one_option(int argc, char** argv, int i, bool* no_more_options);
 873
 874   // Handle a -l option.
 875   int
 876   process_l_option(int, char**, char*, bool);
 877
 878   // Handle a -R option when it means --rpath.
 879   void
 880   add_to_rpath(const char* arg)
 881   { this->options_.add_to_rpath(arg); }
 882
 883   // Add a file for which we just read the symbols.
 884   void
 885   add_just_symbols_file(const char* arg)
 886   {
 887     this->inputs_.add_file(Input_file_argument(arg, false, "", true,
 888                                                this->position_options_));
 889   }
 890
 891   // Handle a --start-group option.
 892   void
 893   start_group(const char* arg);
 894
 895   // Handle a --end-group option.
 896   void
 897   end_group(const char* arg);
 898
 899   // Get an option argument--a helper function for special processing.
 900   const char*
 901   get_special_argument(const char* longname, int argc, char** argv,
 902                        const char* arg, bool long_option,
 903                        int *pret);
 904
 905   // Get the general options.
 906   const General_options&
 907   options() const
 908   { return this->options_; }
 909
 910   // Get the position dependent options.
 911   const Position_dependent_options&
 912   position_dependent_options() const
 913   { return this->position_options_; }
 914
 915   // Get the options which may be set from a linker script.
 916   Script_options*
 917   script_options()
 918   { return this->options_.script_options(); }
 919
 920   const Script_options*
 921   script_options() const
 922   { return this->options_.script_options(); }
 923
 924   // The number of input files.
 925   int
 926   number_of_input_files() const
 927   { return this->inputs_.size(); }
 928
 929   // Iterators to iterate over the list of input files.
 930
 931   const_iterator
 932   begin() const
 933   { return this->inputs_.begin(); }
 934
 935   const_iterator
 936   end() const
 937   { return this->inputs_.end(); }
 938
 939  private:
 940   Command_line(const Command_line&);
 941   Command_line& operator=(const Command_line&);
 942
 943   // Report usage error.
 944   void
 945   usage() ATTRIBUTE_NORETURN;
 946   void
 947   usage(const char* msg, const char* opt) ATTRIBUTE_NORETURN;
 948   void
 949   usage(const char* msg, char opt) ATTRIBUTE_NORETURN;
 950
 951   // Apply a command line option.
 952   void
 953   apply_option(const gold::options::One_option&, const char*);
 954
 955   // Add a file.
 956   void
 957   add_file(const char* name, bool is_lib);
 958
 959   // Examine the result of processing the command-line, and verify
 960   // the flags do not contradict each other or are otherwise illegal.
 961   void
 962   normalize_options();
 963
 964   General_options options_;
 965   Position_dependent_options position_options_;
 966   Input_arguments inputs_;
 967 };
 968
 969 } // End namespace gold.
 970
 971 #endif // !defined(GOLD_OPTIONS_H)