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   GENERAL_NOARG('\0', "allow-shlib-undefined",
 341                 N_("Allow unresolved references in shared libraries"),
 342                 NULL, TWO_DASHES,
 343                 &General_options::set_allow_shlib_undefined),
 344   GENERAL_NOARG('\0', "no-allow-shlib-undefined",
 345                 N_("Do not allow unresolved references in shared libraries"),
 346                 NULL, TWO_DASHES,
 347                 &General_options::set_no_allow_shlib_undefined),
 348   POSDEP_NOARG('\0', "as-needed",
 349                N_("Only set DT_NEEDED for dynamic libs if used"),
 350                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 351   POSDEP_NOARG('\0', "no-as-needed",
 352                N_("Always DT_NEEDED for dynamic libs (default)"),
 353                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 354   POSDEP_NOARG('\0', "Bdynamic",
 355                N_("-l searches for shared libraries"),
 356                NULL, ONE_DASH,
 357                &Position_dependent_options::set_dynamic_search),
 358   POSDEP_NOARG('\0', "Bstatic",
 359                N_("-l does not search for shared libraries"),
 360                NULL, ONE_DASH,
 361                &Position_dependent_options::set_static_search),
 362   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 363                 NULL, ONE_DASH, &General_options::set_symbolic),
 364   GENERAL_NOARG('\0', "detect-odr-violations",
 365                 N_("Try to detect violations of the One Definition Rule"),
 366                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 367   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 368                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 369   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 370                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 371   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 372               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 373               &General_options::set_dynamic_linker),
 374   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 375           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 376           &library),
 377   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 378               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 379               &General_options::add_to_search_path),
 380   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 381               &General_options::ignore),
 382   GENERAL_ARG('o', "output", N_("Set output file name"),
 383               N_("-o FILE, --output FILE"), TWO_DASHES,
 384               &General_options::set_output_file_name),
 385   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 386               N_("-O level"), ONE_DASH,
 387               &General_options::set_optimization_level),
 388   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 389                 ONE_DASH, &General_options::set_relocatable),
 390   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 391               N_("-R DIR, -rpath DIR"), ONE_DASH,
 392               &General_options::add_to_rpath),
 393   GENERAL_ARG('\0', "rpath-link",
 394               N_("Add DIR to link time shared library search path"),
 395               N_("--rpath-link DIR"), TWO_DASHES,
 396               &General_options::add_to_rpath_link),
 397   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 398                 TWO_DASHES, &General_options::set_strip_all),
 399   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 400                 TWO_DASHES, &General_options::set_strip_debug),
 401   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 402                 NULL, ONE_DASH, &General_options::set_shared),
 403   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 404                 NULL, ONE_DASH, &General_options::set_static),
 405   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 406                 NULL, TWO_DASHES, &General_options::set_stats),
 407   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 408               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 409   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 410               N_("-Ttext ADDRESS"), ONE_DASH,
 411               &General_options::set_text_segment_address),
 412   // This must come after -Ttext since it's a prefix of it.
 413   SPECIAL('T', "script", N_("Read linker script"),
 414           N_("-T FILE, --script FILE"), TWO_DASHES,
 415           &invoke_script),
 416   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 417                 NULL, TWO_DASHES, &General_options::set_threads),
 418   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 419                 NULL, TWO_DASHES, &General_options::clear_threads),
 420   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 421               N_("--thread-count COUNT"), TWO_DASHES,
 422               &General_options::set_thread_count),
 423   GENERAL_ARG('\0', "thread-count-initial",
 424               N_("Number of threads to use in initial pass"),
 425               N_("--thread-count-initial COUNT"), TWO_DASHES,
 426               &General_options::set_thread_count_initial),
 427   GENERAL_ARG('\0', "thread-count-middle",
 428               N_("Number of threads to use in middle pass"),
 429               N_("--thread-count-middle COUNT"), TWO_DASHES,
 430               &General_options::set_thread_count_middle),
 431   GENERAL_ARG('\0', "thread-count-final",
 432               N_("Number of threads to use in final pass"),
 433               N_("--thread-count-final COUNT"), TWO_DASHES,
 434               &General_options::set_thread_count_final),
 435   POSDEP_NOARG('\0', "whole-archive",
 436                N_("Include all archive contents"),
 437                NULL, TWO_DASHES,
 438                &Position_dependent_options::set_whole_archive),
 439   POSDEP_NOARG('\0', "no-whole-archive",
 440                N_("Include only needed archive contents"),
 441                NULL, TWO_DASHES,
 442                &Position_dependent_options::clear_whole_archive),
 443
 444   GENERAL_ARG('z', NULL,
 445               N_("Subcommands as follows:\n\
 446     -z execstack              Mark output as requiring executable stack\n\
 447     -z noexecstack            Mark output as not requiring executable stack"),
 448               N_("-z SUBCOMMAND"), ONE_DASH,
 449               &General_options::handle_z_option),
 450
 451   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 452           TWO_DASHES, &start_group),
 453   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 454           TWO_DASHES, &end_group),
 455   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 456           TWO_DASHES, &help),
 457   SPECIAL('v', "version", N_("Report version information"), NULL,
 458           TWO_DASHES, &version)
 459 };
 460
 461 const int options::Command_line_options::options_size =
 462   sizeof (options) / sizeof (options[0]);
 463
 464 // The -z options.
 465
 466 const options::One_z_option
 467 options::Command_line_options::z_options[] =
 468 {
 469   { "execstack", &General_options::set_execstack },
 470   { "noexecstack", &General_options::set_noexecstack },
 471 };
 472
 473 const int options::Command_line_options::z_options_size =
 474   sizeof(z_options) / sizeof(z_options[0]);
 475
 476 // The default values for the general options.
 477
 478 General_options::General_options()
 479   : export_dynamic_(false),
 480     dynamic_linker_(NULL),
 481     search_path_(),
 482     optimization_level_(0),
 483     output_file_name_("a.out"),
 484     is_relocatable_(false),
 485     strip_(STRIP_NONE),
 486     allow_shlib_undefined_(false),
 487     symbolic_(false),
 488     detect_odr_violations_(false),
 489     create_eh_frame_hdr_(false),
 490     rpath_(),
 491     rpath_link_(),
 492     is_shared_(false),
 493     is_static_(false),
 494     print_stats_(false),
 495     sysroot_(),
 496     text_segment_address_(-1U),   // -1 indicates value not set by user
 497     threads_(false),
 498     thread_count_initial_(0),
 499     thread_count_middle_(0),
 500     thread_count_final_(0),
 501     execstack_(EXECSTACK_FROM_INPUT)
 502 {
 503 }
 504
 505 // The default values for the position dependent options.
 506
 507 Position_dependent_options::Position_dependent_options()
 508   : do_static_search_(false),
 509     as_needed_(false),
 510     include_whole_archive_(false)
 511 {
 512 }
 513
 514 // Handle the -z option.
 515
 516 void
 517 General_options::handle_z_option(const char* arg)
 518 {
 519   const int z_options_size = options::Command_line_options::z_options_size;
 520   const gold::options::One_z_option* z_options =
 521     gold::options::Command_line_options::z_options;
 522   for (int i = 0; i < z_options_size; ++i)
 523     {
 524       if (strcmp(arg, z_options[i].name) == 0)
 525         {
 526           (this->*(z_options[i].set))();
 527           return;
 528         }
 529     }
 530
 531   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 532           program_name, arg);
 533   ::exit(1);
 534 }
 535
 536 // Add the sysroot, if any, to the search paths.
 537
 538 void
 539 General_options::add_sysroot()
 540 {
 541   if (this->sysroot_.empty())
 542     {
 543       this->sysroot_ = get_default_sysroot();
 544       if (this->sysroot_.empty())
 545         return;
 546     }
 547
 548   const char* sysroot = this->sysroot_.c_str();
 549   char* canonical_sysroot = lrealpath(sysroot);
 550
 551   for (Dir_list::iterator p = this->search_path_.begin();
 552        p != this->search_path_.end();
 553        ++p)
 554     p->add_sysroot(sysroot, canonical_sysroot);
 555
 556   free(canonical_sysroot);
 557 }
 558
 559 // Search_directory methods.
 560
 561 // This is called if we have a sysroot.  Apply the sysroot if
 562 // appropriate.  Record whether the directory is in the sysroot.
 563
 564 void
 565 Search_directory::add_sysroot(const char* sysroot,
 566                               const char* canonical_sysroot)
 567 {
 568   gold_assert(*sysroot != '\0');
 569   if (this->put_in_sysroot_)
 570     {
 571       if (!IS_DIR_SEPARATOR(this->name_[0])
 572           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 573         this->name_ = '/' + this->name_;
 574       this->name_ = sysroot + this->name_;
 575       this->is_in_sysroot_ = true;
 576     }
 577   else
 578     {
 579       // Check whether this entry is in the sysroot.  To do this
 580       // correctly, we need to use canonical names.  Otherwise we will
 581       // get confused by the ../../.. paths that gcc tends to use.
 582       char* canonical_name = lrealpath(this->name_.c_str());
 583       int canonical_name_len = strlen(canonical_name);
 584       int canonical_sysroot_len = strlen(canonical_sysroot);
 585       if (canonical_name_len > canonical_sysroot_len
 586           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 587         {
 588           canonical_name[canonical_sysroot_len] = '\0';
 589           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 590             this->is_in_sysroot_ = true;
 591         }
 592       free(canonical_name);
 593     }
 594 }
 595
 596 // Input_arguments methods.
 597
 598 // Add a file to the list.
 599
 600 void
 601 Input_arguments::add_file(const Input_file_argument& file)
 602 {
 603   if (!this->in_group_)
 604     this->input_argument_list_.push_back(Input_argument(file));
 605   else
 606     {
 607       gold_assert(!this->input_argument_list_.empty());
 608       gold_assert(this->input_argument_list_.back().is_group());
 609       this->input_argument_list_.back().group()->add_file(file);
 610     }
 611 }
 612
 613 // Start a group.
 614
 615 void
 616 Input_arguments::start_group()
 617 {
 618   gold_assert(!this->in_group_);
 619   Input_file_group* group = new Input_file_group();
 620   this->input_argument_list_.push_back(Input_argument(group));
 621   this->in_group_ = true;
 622 }
 623
 624 // End a group.
 625
 626 void
 627 Input_arguments::end_group()
 628 {
 629   gold_assert(this->in_group_);
 630   this->in_group_ = false;
 631 }
 632
 633 // Command_line options.
 634
 635 Command_line::Command_line()
 636   : options_(), position_options_(), inputs_()
 637 {
 638 }
 639
 640 // Process the command line options.  For process_one_option,
 641 // i is the index of argv to process next, and the return value
 642 // is the index of the next option to process (i+1 or i+2, or argc
 643 // to indicate processing is done).  no_more_options is set to true
 644 // if (and when) "--" is seen as an option.
 645
 646 int
 647 Command_line::process_one_option(int argc, char** argv, int i,
 648                                  bool* no_more_options)
 649 {
 650   const int options_size = options::Command_line_options::options_size;
 651   const options::One_option* options = options::Command_line_options::options;
 652   gold_assert(i < argc);
 653
 654   if (argv[i][0] != '-' || *no_more_options)
 655     {
 656       this->add_file(argv[i], false);
 657       return i + 1;
 658     }
 659
 660   // Option starting with '-'.
 661   int dashes = 1;
 662   if (argv[i][1] == '-')
 663     {
 664       dashes = 2;
 665       if (argv[i][2] == '\0')
 666         {
 667           *no_more_options = true;
 668           return i + 1;
 669         }
 670     }
 671
 672   // Look for a long option match.
 673   char* opt = argv[i] + dashes;
 674   char first = opt[0];
 675   int skiparg = 0;
 676   char* arg = strchr(opt, '=');
 677   bool argument_with_equals = arg != NULL;
 678   if (arg != NULL)
 679     {
 680       *arg = '\0';
 681       ++arg;
 682     }
 683   else if (i + 1 < argc)
 684     {
 685       arg = argv[i + 1];
 686       skiparg = 1;
 687     }
 688
 689   int j;
 690   for (j = 0; j < options_size; ++j)
 691     {
 692       if (options[j].long_option != NULL
 693           && (dashes == 2
 694           || (options[j].dash
 695               != options::One_option::EXACTLY_TWO_DASHES))
 696           && first == options[j].long_option[0]
 697           && strcmp(opt, options[j].long_option) == 0)
 698         {
 699           if (options[j].special)
 700             {
 701               // Restore the '=' we clobbered above.
 702               if (arg != NULL && skiparg == 0)
 703                 arg[-1] = '=';
 704               i += options[j].special(argc - i, argv + i, opt, true, this);
 705             }
 706           else
 707             {
 708               if (!options[j].takes_argument())
 709                 {
 710                   if (argument_with_equals)
 711                     this->usage(_("unexpected argument"), argv[i]);
 712                   arg = NULL;
 713                   skiparg = 0;
 714                 }
 715               else
 716                 {
 717                   if (arg == NULL)
 718                     this->usage(_("missing argument"), argv[i]);
 719                 }
 720               this->apply_option(options[j], arg);
 721               i += skiparg + 1;
 722             }
 723           break;
 724         }
 725     }
 726   if (j < options_size)
 727     return i;
 728
 729   // If we saw two dashes, we needed to have seen a long option.
 730   if (dashes == 2)
 731     this->usage(_("unknown option"), argv[i]);
 732
 733   // Look for a short option match.  There may be more than one
 734   // short option in a given argument.
 735   bool done = false;
 736   char* s = argv[i] + 1;
 737   ++i;
 738   while (*s != '\0' && !done)
 739     {
 740       char opt = *s;
 741       int j;
 742       for (j = 0; j < options_size; ++j)
 743         {
 744           if (options[j].short_option == opt)
 745             {
 746               if (options[j].special)
 747                 {
 748                   // Undo the argument skip done above.
 749                   --i;
 750                   i += options[j].special(argc - i, argv + i, s, false,
 751                                           this);
 752                   done = true;
 753                 }
 754               else
 755                 {
 756                   arg = NULL;
 757                   if (options[j].takes_argument())
 758                     {
 759                       if (s[1] != '\0')
 760                         {
 761                           arg = s + 1;
 762                           done = true;
 763                         }
 764                       else if (i < argc)
 765                         {
 766                           arg = argv[i];
 767                           ++i;
 768                         }
 769                       else
 770                         this->usage(_("missing argument"), opt);
 771                     }
 772                   this->apply_option(options[j], arg);
 773                 }
 774               break;
 775             }
 776         }
 777
 778       if (j >= options_size)
 779         this->usage(_("unknown option"), *s);
 780
 781       ++s;
 782     }
 783   return i;
 784 }
 785
 786
 787 void
 788 Command_line::process(int argc, char** argv)
 789 {
 790   bool no_more_options = false;
 791   int i = 0;
 792   while (i < argc)
 793     i = process_one_option(argc, argv, i, &no_more_options);
 794
 795   if (this->inputs_.in_group())
 796     {
 797       fprintf(stderr, _("%s: missing group end\n"), program_name);
 798       this->usage();
 799     }
 800
 801   // FIXME: We should only do this when configured in native mode.
 802   this->options_.add_to_search_path_with_sysroot("/lib");
 803   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 804
 805   this->options_.add_sysroot();
 806
 807   // Ensure options don't contradict each other and are otherwise kosher.
 808   this->normalize_options();
 809 }
 810
 811 // Extract an option argument for a special option.  LONGNAME is the
 812 // long name of the option.  This sets *PRET to the return value for
 813 // the special function handler to skip to the next option.
 814
 815 const char*
 816 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 817                                    const char* arg, bool long_option,
 818                                    int *pret)
 819 {
 820   if (long_option)
 821     {
 822       size_t longlen = strlen(longname);
 823       gold_assert(strncmp(arg, longname, longlen) == 0);
 824       arg += longlen;
 825       if (*arg == '=')
 826         {
 827           *pret = 1;
 828           return arg + 1;
 829         }
 830       else if (argc > 1)
 831         {
 832           gold_assert(*arg == '\0');
 833           *pret = 2;
 834           return argv[1];
 835         }
 836     }
 837   else
 838     {
 839       if (arg[1] != '\0')
 840         {
 841           *pret = 1;
 842           return arg + 1;
 843         }
 844       else if (argc > 1)
 845         {
 846           *pret = 2;
 847           return argv[1];
 848         }
 849     }
 850
 851   this->usage(_("missing argument"), arg);
 852 }
 853
 854 // Ensure options don't contradict each other and are otherwise kosher.
 855
 856 void
 857 Command_line::normalize_options()
 858 {
 859   // If the user specifies both -s and -r, convert the -s as -S.
 860   // -r requires us to keep externally visible symbols!
 861   if (this->options_.strip_all() && this->options_.is_relocatable())
 862     {
 863       // Clears the strip_all() status, replacing it with strip_debug().
 864       this->options_.set_strip_debug();
 865     }
 866
 867   // FIXME: we can/should be doing a lot more sanity checking here.
 868 }
 869
 870
 871 // Apply a command line option.
 872
 873 void
 874 Command_line::apply_option(const options::One_option& opt,
 875                            const char* arg)
 876 {
 877   if (arg == NULL)
 878     {
 879       if (opt.general_noarg)
 880         (this->options_.*(opt.general_noarg))();
 881       else if (opt.dependent_noarg)
 882         (this->position_options_.*(opt.dependent_noarg))();
 883       else
 884         gold_unreachable();
 885     }
 886   else
 887     {
 888       if (opt.general_arg)
 889         (this->options_.*(opt.general_arg))(arg);
 890       else if (opt.dependent_arg)
 891         (this->position_options_.*(opt.dependent_arg))(arg);
 892       else
 893         gold_unreachable();
 894     }
 895 }
 896
 897 // Add an input file or library.
 898
 899 void
 900 Command_line::add_file(const char* name, bool is_lib)
 901 {
 902   Input_file_argument file(name, is_lib, "", this->position_options_);
 903   this->inputs_.add_file(file);
 904 }
 905
 906 // Handle the -l option, which requires special treatment.
 907
 908 int
 909 Command_line::process_l_option(int argc, char** argv, char* arg,
 910                                bool long_option)
 911 {
 912   int ret;
 913   const char* libname = this->get_special_argument("library", argc, argv, arg,
 914                                                    long_option, &ret);
 915   this->add_file(libname, true);
 916   return ret;
 917 }
 918
 919 // Handle the --start-group option.
 920
 921 void
 922 Command_line::start_group(const char* arg)
 923 {
 924   if (this->inputs_.in_group())
 925     this->usage(_("may not nest groups"), arg);
 926   this->inputs_.start_group();
 927 }
 928
 929 // Handle the --end-group option.
 930
 931 void
 932 Command_line::end_group(const char* arg)
 933 {
 934   if (!this->inputs_.in_group())
 935     this->usage(_("group end without group start"), arg);
 936   this->inputs_.end_group();
 937 }
 938
 939 // Report a usage error.  */
 940
 941 void
 942 Command_line::usage()
 943 {
 944   fprintf(stderr,
 945           _("%s: use the --help option for usage information\n"),
 946           program_name);
 947   ::exit(1);
 948 }
 949
 950 void
 951 Command_line::usage(const char* msg, const char *opt)
 952 {
 953   fprintf(stderr,
 954           _("%s: %s: %s\n"),
 955           program_name, opt, msg);
 956   this->usage();
 957 }
 958
 959 void
 960 Command_line::usage(const char* msg, char opt)
 961 {
 962   fprintf(stderr,
 963           _("%s: -%c: %s\n"),
 964           program_name, opt, msg);
 965   this->usage();
 966 }
 967
 968 } // End namespace gold.