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 <cstdlib>
  26 #include <iostream>
  27 #include <sys/stat.h>
  28 #include "filenames.h"
  29 #include "libiberty.h"
  30
  31 #include "debug.h"
  32 #include "options.h"
  33
  34 namespace gold
  35 {
  36
  37 // The information we keep for a single command line option.
  38
  39 struct options::One_option
  40 {
  41   // The single character option name, or '\0' if this is only a long
  42   // option.
  43   char short_option;
  44
  45   // The long option name, or NULL if this is only a short option.
  46   const char* long_option;
  47
  48   // Description of the option for --help output, or NULL if there is none.
  49   const char* doc;
  50
  51   // How to print the option name in --help output, or NULL to use the
  52   // default.
  53   const char* help_output;
  54
  55   // Long option dash control.  This is ignored if long_option is
  56   // NULL.
  57   enum
  58     {
  59       // Long option normally takes one dash; two dashes are also
  60       // accepted.
  61       ONE_DASH,
  62       // Long option normally takes two dashes; one dash is also
  63       // accepted.
  64       TWO_DASHES,
  65       // Long option always takes two dashes.
  66       EXACTLY_TWO_DASHES
  67     } dash;
  68
  69   // Function for special handling, or NULL.  Returns the number of
  70   // arguments to skip.  This will normally be at least 1, but it may
  71   // be 0 if this function changes *argv.  ARG points to the location
  72   // in *ARGV where the option starts, which may be helpful for a
  73   // short option.
  74   int (*special)(int argc, char** argv, char *arg, bool long_option,
  75                  Command_line*);
  76
  77   // If this is a position independent option which does not take an
  78   // argument, this is the member function to call to record it.
  79   void (General_options::*general_noarg)();
  80
  81   // If this is a position independent function which takes an
  82   // argument, this is the member function to call to record it.
  83   void (General_options::*general_arg)(const char*);
  84
  85   // If this is a position dependent option which does not take an
  86   // argument, this is the member function to call to record it.
  87   void (Position_dependent_options::*dependent_noarg)();
  88
  89   // If this is a position dependent option which takes an argument,
  90   // this is the member function to record it.
  91   void (Position_dependent_options::*dependent_arg)(const char*);
  92
  93   // Return whether this option takes an argument.
  94   bool
  95   takes_argument() const
  96   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  97 };
  98
  99 // We have a separate table for -z options.
 100
 101 struct options::One_z_option
 102 {
 103   // The name of the option.
 104   const char* name;
 105
 106   // The member function in General_options called to record it.
 107   void (General_options::*set)();
 108 };
 109
 110 // We have a separate table for --debug options.
 111
 112 struct options::One_debug_option
 113 {
 114   // The name of the option.
 115   const char* name;
 116
 117   // The flags to turn on.
 118   unsigned int debug_flags;
 119 };
 120
 121 class options::Command_line_options
 122 {
 123  public:
 124   static const One_option options[];
 125   static const int options_size;
 126   static const One_z_option z_options[];
 127   static const int z_options_size;
 128   static const One_debug_option debug_options[];
 129   static const int debug_options_size;
 130 };
 131
 132 } // End namespace gold.
 133
 134 namespace
 135 {
 136
 137 // Handle the special -l option, which adds an input file.
 138
 139 int
 140 library(int argc, char** argv, char* arg, bool long_option,
 141         gold::Command_line* cmdline)
 142 {
 143   return cmdline->process_l_option(argc, argv, arg, long_option);
 144 }
 145
 146 // Handle the special -T/--script option, which reads a linker script.
 147
 148 int
 149 invoke_script(int argc, char** argv, char* arg, bool long_option,
 150               gold::Command_line* cmdline)
 151 {
 152   int ret;
 153   const char* script_name = cmdline->get_special_argument("script", argc, argv,
 154                                                           arg, long_option,
 155                                                           &ret);
 156   if (!read_commandline_script(script_name, cmdline))
 157     gold::gold_error(_("%s: unable to parse script file %s\n"),
 158                      gold::program_name, arg);
 159   return ret;
 160 }
 161
 162 // Handle the special --start-group option.
 163
 164 int
 165 start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 166 {
 167   cmdline->start_group(arg);
 168   return 1;
 169 }
 170
 171 // Handle the special --end-group option.
 172
 173 int
 174 end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 175 {
 176   cmdline->end_group(arg);
 177   return 1;
 178 }
 179
 180 // Report usage information for ld --help, and exit.
 181
 182 int
 183 help(int, char**, char*, bool, gold::Command_line*)
 184 {
 185   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 186
 187   const int options_size = gold::options::Command_line_options::options_size;
 188   const gold::options::One_option* options =
 189     gold::options::Command_line_options::options;
 190   for (int i = 0; i < options_size; ++i)
 191     {
 192       if (options[i].doc == NULL)
 193         continue;
 194
 195       printf("  ");
 196       int len = 2;
 197       bool comma = false;
 198
 199       int j = i;
 200       do
 201         {
 202           if (options[j].help_output != NULL)
 203             {
 204               if (comma)
 205                 {
 206                   printf(", ");
 207                   len += 2;
 208                 }
 209               printf(options[j].help_output);
 210               len += std::strlen(options[i].help_output);
 211               comma = true;
 212             }
 213           else
 214             {
 215               if (options[j].short_option != '\0')
 216                 {
 217                   if (comma)
 218                     {
 219                       printf(", ");
 220                       len += 2;
 221                     }
 222                   printf("-%c", options[j].short_option);
 223                   len += 2;
 224                   comma = true;
 225                 }
 226
 227               if (options[j].long_option != NULL)
 228                 {
 229                   if (comma)
 230                     {
 231                       printf(", ");
 232                       len += 2;
 233                     }
 234                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 235                     {
 236                       printf("-");
 237                       ++len;
 238                     }
 239                   else
 240                     {
 241                       printf("--");
 242                       len += 2;
 243                     }
 244                   printf("%s", options[j].long_option);
 245                   len += std::strlen(options[j].long_option);
 246                   comma = true;
 247                 }
 248             }
 249           ++j;
 250         }
 251       while (j < options_size && options[j].doc == NULL);
 252
 253       if (len >= 30)
 254         {
 255           printf("\n");
 256           len = 0;
 257         }
 258       for (; len < 30; ++len)
 259         std::putchar(' ');
 260
 261       std::puts(options[i].doc);
 262     }
 263
 264   ::exit(EXIT_SUCCESS);
 265
 266   return 0;
 267 }
 268
 269 // Report version information.
 270
 271 int
 272 version(int, char**, char* opt, bool, gold::Command_line*)
 273 {
 274   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 275   ::exit(EXIT_SUCCESS);
 276   return 0;
 277 }
 278
 279 // If the default sysroot is relocatable, try relocating it based on
 280 // the prefix FROM.
 281
 282 char*
 283 get_relative_sysroot(const char* from)
 284 {
 285   char* path = make_relative_prefix(gold::program_name, from,
 286                                     TARGET_SYSTEM_ROOT);
 287   if (path != NULL)
 288     {
 289       struct stat s;
 290       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 291         return path;
 292       free(path);
 293     }
 294
 295   return NULL;
 296 }
 297
 298 // Return the default sysroot.  This is set by the --with-sysroot
 299 // option to configure.
 300
 301 std::string
 302 get_default_sysroot()
 303 {
 304   const char* sysroot = TARGET_SYSTEM_ROOT;
 305   if (*sysroot == '\0')
 306     return "";
 307
 308   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 309     {
 310       char* path = get_relative_sysroot (BINDIR);
 311       if (path == NULL)
 312         path = get_relative_sysroot (TOOLBINDIR);
 313       if (path != NULL)
 314         {
 315           std::string ret = path;
 316           free(path);
 317           return ret;
 318         }
 319     }
 320
 321   return sysroot;
 322 }
 323
 324 } // End anonymous namespace.
 325
 326 namespace gold
 327 {
 328
 329 // Helper macros used to specify the options.  We could also do this
 330 // using constructors, but then g++ would generate code to initialize
 331 // the array.  We want the array to be initialized statically so that
 332 // we get better startup time.
 333
 334 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 335   { short_option, long_option, doc, help, options::One_option::dash, \
 336       NULL, func, NULL, NULL, NULL }
 337 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 338   { short_option, long_option, doc, help, options::One_option::dash, \
 339       NULL, NULL, func, NULL, NULL }
 340 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 341   { short_option, long_option, doc, help, options::One_option::dash, \
 342       NULL,  NULL, NULL, func, NULL }
 343 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 344   { short_option, long_option, doc, help, options::One_option::dash, \
 345       NULL, NULL, NULL, NULL, func }
 346 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 347   { short_option, long_option, doc, help, options::One_option::dash, \
 348       func, NULL, NULL, NULL, NULL }
 349
 350 // Here is the actual list of options which we accept.
 351
 352 const options::One_option
 353 options::Command_line_options::options[] =
 354 {
 355   GENERAL_NOARG('\0', "allow-shlib-undefined",
 356                 N_("Allow unresolved references in shared libraries"),
 357                 NULL, TWO_DASHES,
 358                 &General_options::set_allow_shlib_undefined),
 359   GENERAL_NOARG('\0', "no-allow-shlib-undefined",
 360                 N_("Do not allow unresolved references in shared libraries"),
 361                 NULL, TWO_DASHES,
 362                 &General_options::set_no_allow_shlib_undefined),
 363   POSDEP_NOARG('\0', "as-needed",
 364                N_("Only set DT_NEEDED for dynamic libs if used"),
 365                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 366   POSDEP_NOARG('\0', "no-as-needed",
 367                N_("Always DT_NEEDED for dynamic libs (default)"),
 368                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 369   POSDEP_NOARG('\0', "Bdynamic",
 370                N_("-l searches for shared libraries"),
 371                NULL, ONE_DASH,
 372                &Position_dependent_options::set_dynamic_search),
 373   POSDEP_NOARG('\0', "Bstatic",
 374                N_("-l does not search for shared libraries"),
 375                NULL, ONE_DASH,
 376                &Position_dependent_options::set_static_search),
 377   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 378                 NULL, ONE_DASH, &General_options::set_symbolic),
 379 #ifdef HAVE_ZLIB_H
 380 # define ZLIB_STR  ",zlib"
 381 #else
 382 # define ZLIB_STR  ""
 383 #endif
 384   GENERAL_ARG('\0', "compress-debug-sections",
 385               N_("Compress .debug_* sections in the output file "
 386                  "(default is none)"),
 387               N_("--compress-debug-sections=[none" ZLIB_STR "]"),
 388               TWO_DASHES,
 389               &General_options::set_compress_debug_sections),
 390   GENERAL_NOARG('\0', "demangle", N_("Demangle C++ symbols in log messages"),
 391                 NULL, TWO_DASHES, &General_options::set_demangle),
 392   GENERAL_NOARG('\0', "no-demangle",
 393                 N_("Do not demangle C++ symbols in log messages"),
 394                 NULL, TWO_DASHES, &General_options::clear_demangle),
 395   GENERAL_NOARG('\0', "detect-odr-violations",
 396                 N_("Try to detect violations of the One Definition Rule"),
 397                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 398   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 399                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 400   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 401                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 402   GENERAL_ARG('h', "soname", N_("Set shared library name"),
 403               N_("-h FILENAME, --soname FILENAME"), ONE_DASH,
 404               &General_options::set_soname),
 405   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 406               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 407               &General_options::set_dynamic_linker),
 408   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 409           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 410           &library),
 411   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 412               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 413               &General_options::add_to_search_path),
 414   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 415               &General_options::ignore),
 416   GENERAL_ARG('o', "output", N_("Set output file name"),
 417               N_("-o FILE, --output FILE"), TWO_DASHES,
 418               &General_options::set_output_file_name),
 419   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 420               N_("-O level"), ONE_DASH,
 421               &General_options::set_optimization_level),
 422   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 423                 ONE_DASH, &General_options::set_relocatable),
 424   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 425               N_("-R DIR, -rpath DIR"), ONE_DASH,
 426               &General_options::add_to_rpath),
 427   GENERAL_ARG('\0', "rpath-link",
 428               N_("Add DIR to link time shared library search path"),
 429               N_("--rpath-link DIR"), TWO_DASHES,
 430               &General_options::add_to_rpath_link),
 431   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 432                 TWO_DASHES, &General_options::set_strip_all),
 433   GENERAL_NOARG('\0', "strip-debug-gdb",
 434                 N_("Strip debug symbols that are unused by gdb "
 435                    "(at least versions <= 6.7)"),
 436                 NULL, TWO_DASHES, &General_options::set_strip_debug_gdb),
 437   // This must come after -Sdebug since it's a prefix of it.
 438   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 439                 TWO_DASHES, &General_options::set_strip_debug),
 440   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 441                 NULL, ONE_DASH, &General_options::set_shared),
 442   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 443                 NULL, ONE_DASH, &General_options::set_static),
 444   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 445                 NULL, TWO_DASHES, &General_options::set_stats),
 446   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 447               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 448   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 449               N_("-Ttext ADDRESS"), ONE_DASH,
 450               &General_options::set_text_segment_address),
 451   // This must come after -Ttext since it's a prefix of it.
 452   SPECIAL('T', "script", N_("Read linker script"),
 453           N_("-T FILE, --script FILE"), TWO_DASHES,
 454           &invoke_script),
 455   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 456                 NULL, TWO_DASHES, &General_options::set_threads),
 457   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 458                 NULL, TWO_DASHES, &General_options::clear_threads),
 459   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 460               N_("--thread-count COUNT"), TWO_DASHES,
 461               &General_options::set_thread_count),
 462   GENERAL_ARG('\0', "thread-count-initial",
 463               N_("Number of threads to use in initial pass"),
 464               N_("--thread-count-initial COUNT"), TWO_DASHES,
 465               &General_options::set_thread_count_initial),
 466   GENERAL_ARG('\0', "thread-count-middle",
 467               N_("Number of threads to use in middle pass"),
 468               N_("--thread-count-middle COUNT"), TWO_DASHES,
 469               &General_options::set_thread_count_middle),
 470   GENERAL_ARG('\0', "thread-count-final",
 471               N_("Number of threads to use in final pass"),
 472               N_("--thread-count-final COUNT"), TWO_DASHES,
 473               &General_options::set_thread_count_final),
 474   POSDEP_NOARG('\0', "whole-archive",
 475                N_("Include all archive contents"),
 476                NULL, TWO_DASHES,
 477                &Position_dependent_options::set_whole_archive),
 478   POSDEP_NOARG('\0', "no-whole-archive",
 479                N_("Include only needed archive contents"),
 480                NULL, TWO_DASHES,
 481                &Position_dependent_options::clear_whole_archive),
 482
 483   GENERAL_ARG('z', NULL,
 484               N_("Subcommands as follows:\n\
 485     -z execstack              Mark output as requiring executable stack\n\
 486     -z noexecstack            Mark output as not requiring executable stack"),
 487               N_("-z SUBCOMMAND"), ONE_DASH,
 488               &General_options::handle_z_option),
 489
 490   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 491           TWO_DASHES, &start_group),
 492   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 493           TWO_DASHES, &end_group),
 494   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 495           TWO_DASHES, &help),
 496   SPECIAL('v', "version", N_("Report version information"), NULL,
 497           TWO_DASHES, &version),
 498   GENERAL_ARG('\0', "debug", N_("Turn on debugging (all,task)"),
 499               N_("--debug=TYPE"), TWO_DASHES,
 500               &General_options::handle_debug_option)
 501 };
 502
 503 const int options::Command_line_options::options_size =
 504   sizeof (options) / sizeof (options[0]);
 505
 506 // The -z options.
 507
 508 const options::One_z_option
 509 options::Command_line_options::z_options[] =
 510 {
 511   { "execstack", &General_options::set_execstack },
 512   { "noexecstack", &General_options::set_noexecstack },
 513 };
 514
 515 const int options::Command_line_options::z_options_size =
 516   sizeof(z_options) / sizeof(z_options[0]);
 517
 518 // The --debug options.
 519
 520 const options::One_debug_option
 521 options::Command_line_options::debug_options[] =
 522 {
 523   { "all", DEBUG_ALL },
 524   { "task", DEBUG_TASK },
 525 };
 526
 527 const int options::Command_line_options::debug_options_size =
 528   sizeof(debug_options) / sizeof(debug_options[0]);
 529
 530 // The default values for the general options.
 531
 532 General_options::General_options()
 533   : export_dynamic_(false),
 534     soname_(NULL),
 535     dynamic_linker_(NULL),
 536     search_path_(),
 537     optimization_level_(0),
 538     output_file_name_("a.out"),
 539     is_relocatable_(false),
 540     strip_(STRIP_NONE),
 541     allow_shlib_undefined_(false),
 542     symbolic_(false),
 543     compress_debug_sections_(NO_COMPRESSION),
 544     detect_odr_violations_(false),
 545     create_eh_frame_hdr_(false),
 546     rpath_(),
 547     rpath_link_(),
 548     is_shared_(false),
 549     is_static_(false),
 550     print_stats_(false),
 551     sysroot_(),
 552     text_segment_address_(-1U),   // -1 indicates value not set by user
 553     threads_(false),
 554     thread_count_initial_(0),
 555     thread_count_middle_(0),
 556     thread_count_final_(0),
 557     execstack_(EXECSTACK_FROM_INPUT),
 558     debug_(0)
 559 {
 560   // We initialize demangle_ based on the environment variable
 561   // COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
 562   // output of the linker, unless COLLECT_NO_DEMANGLE is set in the
 563   // environment.  Acting the same way here lets us provide the same
 564   // interface by default.
 565   this->demangle_ = getenv("COLLECT_NO_DEMANGLE") == NULL;
 566 }
 567
 568 // The default values for the position dependent options.
 569
 570 Position_dependent_options::Position_dependent_options()
 571   : do_static_search_(false),
 572     as_needed_(false),
 573     include_whole_archive_(false)
 574 {
 575 }
 576
 577 // Handle the -z option.
 578
 579 void
 580 General_options::handle_z_option(const char* arg)
 581 {
 582   const int z_options_size = options::Command_line_options::z_options_size;
 583   const gold::options::One_z_option* z_options =
 584     gold::options::Command_line_options::z_options;
 585   for (int i = 0; i < z_options_size; ++i)
 586     {
 587       if (strcmp(arg, z_options[i].name) == 0)
 588         {
 589           (this->*(z_options[i].set))();
 590           return;
 591         }
 592     }
 593
 594   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 595           program_name, arg);
 596   ::exit(EXIT_FAILURE);
 597 }
 598
 599 // Handle the --debug option.
 600
 601 void
 602 General_options::handle_debug_option(const char* arg)
 603 {
 604   const int debug_options_size =
 605     options::Command_line_options::debug_options_size;
 606   const gold::options::One_debug_option* debug_options =
 607     options::Command_line_options::debug_options;
 608   for (int i = 0; i < debug_options_size; ++i)
 609     {
 610       if (strcmp(arg, debug_options[i].name) == 0)
 611         {
 612           this->set_debug(debug_options[i].debug_flags);
 613           return;
 614         }
 615     }
 616
 617   fprintf(stderr, _("%s: unrecognized --debug subcommand: %s\n"),
 618           program_name, arg);
 619   ::exit(EXIT_FAILURE);
 620 }
 621
 622 // Add the sysroot, if any, to the search paths.
 623
 624 void
 625 General_options::add_sysroot()
 626 {
 627   if (this->sysroot_.empty())
 628     {
 629       this->sysroot_ = get_default_sysroot();
 630       if (this->sysroot_.empty())
 631         return;
 632     }
 633
 634   const char* sysroot = this->sysroot_.c_str();
 635   char* canonical_sysroot = lrealpath(sysroot);
 636
 637   for (Dir_list::iterator p = this->search_path_.begin();
 638        p != this->search_path_.end();
 639        ++p)
 640     p->add_sysroot(sysroot, canonical_sysroot);
 641
 642   free(canonical_sysroot);
 643 }
 644
 645 // Search_directory methods.
 646
 647 // This is called if we have a sysroot.  Apply the sysroot if
 648 // appropriate.  Record whether the directory is in the sysroot.
 649
 650 void
 651 Search_directory::add_sysroot(const char* sysroot,
 652                               const char* canonical_sysroot)
 653 {
 654   gold_assert(*sysroot != '\0');
 655   if (this->put_in_sysroot_)
 656     {
 657       if (!IS_DIR_SEPARATOR(this->name_[0])
 658           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 659         this->name_ = '/' + this->name_;
 660       this->name_ = sysroot + this->name_;
 661       this->is_in_sysroot_ = true;
 662     }
 663   else
 664     {
 665       // Check whether this entry is in the sysroot.  To do this
 666       // correctly, we need to use canonical names.  Otherwise we will
 667       // get confused by the ../../.. paths that gcc tends to use.
 668       char* canonical_name = lrealpath(this->name_.c_str());
 669       int canonical_name_len = strlen(canonical_name);
 670       int canonical_sysroot_len = strlen(canonical_sysroot);
 671       if (canonical_name_len > canonical_sysroot_len
 672           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 673         {
 674           canonical_name[canonical_sysroot_len] = '\0';
 675           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 676             this->is_in_sysroot_ = true;
 677         }
 678       free(canonical_name);
 679     }
 680 }
 681
 682 // Input_arguments methods.
 683
 684 // Add a file to the list.
 685
 686 void
 687 Input_arguments::add_file(const Input_file_argument& file)
 688 {
 689   if (!this->in_group_)
 690     this->input_argument_list_.push_back(Input_argument(file));
 691   else
 692     {
 693       gold_assert(!this->input_argument_list_.empty());
 694       gold_assert(this->input_argument_list_.back().is_group());
 695       this->input_argument_list_.back().group()->add_file(file);
 696     }
 697 }
 698
 699 // Start a group.
 700
 701 void
 702 Input_arguments::start_group()
 703 {
 704   gold_assert(!this->in_group_);
 705   Input_file_group* group = new Input_file_group();
 706   this->input_argument_list_.push_back(Input_argument(group));
 707   this->in_group_ = true;
 708 }
 709
 710 // End a group.
 711
 712 void
 713 Input_arguments::end_group()
 714 {
 715   gold_assert(this->in_group_);
 716   this->in_group_ = false;
 717 }
 718
 719 // Command_line options.
 720
 721 Command_line::Command_line()
 722   : options_(), position_options_(), inputs_()
 723 {
 724 }
 725
 726 // Process the command line options.  For process_one_option,
 727 // i is the index of argv to process next, and the return value
 728 // is the index of the next option to process (i+1 or i+2, or argc
 729 // to indicate processing is done).  no_more_options is set to true
 730 // if (and when) "--" is seen as an option.
 731
 732 int
 733 Command_line::process_one_option(int argc, char** argv, int i,
 734                                  bool* no_more_options)
 735 {
 736   const int options_size = options::Command_line_options::options_size;
 737   const options::One_option* options = options::Command_line_options::options;
 738   gold_assert(i < argc);
 739
 740   if (argv[i][0] != '-' || *no_more_options)
 741     {
 742       this->add_file(argv[i], false);
 743       return i + 1;
 744     }
 745
 746   // Option starting with '-'.
 747   int dashes = 1;
 748   if (argv[i][1] == '-')
 749     {
 750       dashes = 2;
 751       if (argv[i][2] == '\0')
 752         {
 753           *no_more_options = true;
 754           return i + 1;
 755         }
 756     }
 757
 758   // Look for a long option match.
 759   char* opt = argv[i] + dashes;
 760   char first = opt[0];
 761   int skiparg = 0;
 762   char* arg = strchr(opt, '=');
 763   bool argument_with_equals = arg != NULL;
 764   if (arg != NULL)
 765     {
 766       *arg = '\0';
 767       ++arg;
 768     }
 769   else if (i + 1 < argc)
 770     {
 771       arg = argv[i + 1];
 772       skiparg = 1;
 773     }
 774
 775   int j;
 776   for (j = 0; j < options_size; ++j)
 777     {
 778       if (options[j].long_option != NULL
 779           && (dashes == 2
 780           || (options[j].dash
 781               != options::One_option::EXACTLY_TWO_DASHES))
 782           && first == options[j].long_option[0]
 783           && strcmp(opt, options[j].long_option) == 0)
 784         {
 785           if (options[j].special)
 786             {
 787               // Restore the '=' we clobbered above.
 788               if (arg != NULL && skiparg == 0)
 789                 arg[-1] = '=';
 790               i += options[j].special(argc - i, argv + i, opt, true, this);
 791             }
 792           else
 793             {
 794               if (!options[j].takes_argument())
 795                 {
 796                   if (argument_with_equals)
 797                     this->usage(_("unexpected argument"), argv[i]);
 798                   arg = NULL;
 799                   skiparg = 0;
 800                 }
 801               else
 802                 {
 803                   if (arg == NULL)
 804                     this->usage(_("missing argument"), argv[i]);
 805                 }
 806               this->apply_option(options[j], arg);
 807               i += skiparg + 1;
 808             }
 809           break;
 810         }
 811     }
 812   if (j < options_size)
 813     return i;
 814
 815   // If we saw two dashes, we needed to have seen a long option.
 816   if (dashes == 2)
 817     this->usage(_("unknown option"), argv[i]);
 818
 819   // Look for a short option match.  There may be more than one
 820   // short option in a given argument.
 821   bool done = false;
 822   char* s = argv[i] + 1;
 823   ++i;
 824   while (*s != '\0' && !done)
 825     {
 826       char opt = *s;
 827       int j;
 828       for (j = 0; j < options_size; ++j)
 829         {
 830           if (options[j].short_option == opt)
 831             {
 832               if (options[j].special)
 833                 {
 834                   // Undo the argument skip done above.
 835                   --i;
 836                   i += options[j].special(argc - i, argv + i, s, false,
 837                                           this);
 838                   done = true;
 839                 }
 840               else
 841                 {
 842                   arg = NULL;
 843                   if (options[j].takes_argument())
 844                     {
 845                       if (s[1] != '\0')
 846                         {
 847                           arg = s + 1;
 848                           done = true;
 849                         }
 850                       else if (i < argc)
 851                         {
 852                           arg = argv[i];
 853                           ++i;
 854                         }
 855                       else
 856                         this->usage(_("missing argument"), opt);
 857                     }
 858                   this->apply_option(options[j], arg);
 859                 }
 860               break;
 861             }
 862         }
 863
 864       if (j >= options_size)
 865         this->usage(_("unknown option"), *s);
 866
 867       ++s;
 868     }
 869   return i;
 870 }
 871
 872
 873 void
 874 Command_line::process(int argc, char** argv)
 875 {
 876   bool no_more_options = false;
 877   int i = 0;
 878   while (i < argc)
 879     i = process_one_option(argc, argv, i, &no_more_options);
 880
 881   if (this->inputs_.in_group())
 882     {
 883       fprintf(stderr, _("%s: missing group end\n"), program_name);
 884       this->usage();
 885     }
 886
 887   // FIXME: We should only do this when configured in native mode.
 888   this->options_.add_to_search_path_with_sysroot("/lib");
 889   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 890
 891   this->options_.add_sysroot();
 892
 893   // Ensure options don't contradict each other and are otherwise kosher.
 894   this->normalize_options();
 895 }
 896
 897 // Extract an option argument for a special option.  LONGNAME is the
 898 // long name of the option.  This sets *PRET to the return value for
 899 // the special function handler to skip to the next option.
 900
 901 const char*
 902 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 903                                    const char* arg, bool long_option,
 904                                    int *pret)
 905 {
 906   if (long_option)
 907     {
 908       size_t longlen = strlen(longname);
 909       gold_assert(strncmp(arg, longname, longlen) == 0);
 910       arg += longlen;
 911       if (*arg == '=')
 912         {
 913           *pret = 1;
 914           return arg + 1;
 915         }
 916       else if (argc > 1)
 917         {
 918           gold_assert(*arg == '\0');
 919           *pret = 2;
 920           return argv[1];
 921         }
 922     }
 923   else
 924     {
 925       if (arg[1] != '\0')
 926         {
 927           *pret = 1;
 928           return arg + 1;
 929         }
 930       else if (argc > 1)
 931         {
 932           *pret = 2;
 933           return argv[1];
 934         }
 935     }
 936
 937   this->usage(_("missing argument"), arg);
 938 }
 939
 940 // Ensure options don't contradict each other and are otherwise kosher.
 941
 942 void
 943 Command_line::normalize_options()
 944 {
 945   // If the user specifies both -s and -r, convert the -s as -S.
 946   // -r requires us to keep externally visible symbols!
 947   if (this->options_.strip_all() && this->options_.is_relocatable())
 948     {
 949       // Clears the strip_all() status, replacing it with strip_debug().
 950       this->options_.set_strip_debug();
 951     }
 952
 953   // FIXME: we can/should be doing a lot more sanity checking here.
 954 }
 955
 956
 957 // Apply a command line option.
 958
 959 void
 960 Command_line::apply_option(const options::One_option& opt,
 961                            const char* arg)
 962 {
 963   if (arg == NULL)
 964     {
 965       if (opt.general_noarg)
 966         (this->options_.*(opt.general_noarg))();
 967       else if (opt.dependent_noarg)
 968         (this->position_options_.*(opt.dependent_noarg))();
 969       else
 970         gold_unreachable();
 971     }
 972   else
 973     {
 974       if (opt.general_arg)
 975         (this->options_.*(opt.general_arg))(arg);
 976       else if (opt.dependent_arg)
 977         (this->position_options_.*(opt.dependent_arg))(arg);
 978       else
 979         gold_unreachable();
 980     }
 981 }
 982
 983 // Add an input file or library.
 984
 985 void
 986 Command_line::add_file(const char* name, bool is_lib)
 987 {
 988   Input_file_argument file(name, is_lib, "", this->position_options_);
 989   this->inputs_.add_file(file);
 990 }
 991
 992 // Handle the -l option, which requires special treatment.
 993
 994 int
 995 Command_line::process_l_option(int argc, char** argv, char* arg,
 996                                bool long_option)
 997 {
 998   int ret;
 999   const char* libname = this->get_special_argument("library", argc, argv, arg,
1000                                                    long_option, &ret);
1001   this->add_file(libname, true);
1002   return ret;
1003 }
1004
1005 // Handle the --start-group option.
1006
1007 void
1008 Command_line::start_group(const char* arg)
1009 {
1010   if (this->inputs_.in_group())
1011     this->usage(_("may not nest groups"), arg);
1012   this->inputs_.start_group();
1013 }
1014
1015 // Handle the --end-group option.
1016
1017 void
1018 Command_line::end_group(const char* arg)
1019 {
1020   if (!this->inputs_.in_group())
1021     this->usage(_("group end without group start"), arg);
1022   this->inputs_.end_group();
1023 }
1024
1025 // Report a usage error.  */
1026
1027 void
1028 Command_line::usage()
1029 {
1030   fprintf(stderr,
1031           _("%s: use the --help option for usage information\n"),
1032           program_name);
1033   ::exit(EXIT_FAILURE);
1034 }
1035
1036 void
1037 Command_line::usage(const char* msg, const char *opt)
1038 {
1039   fprintf(stderr,
1040           _("%s: %s: %s\n"),
1041           program_name, opt, msg);
1042   this->usage();
1043 }
1044
1045 void
1046 Command_line::usage(const char* msg, char opt)
1047 {
1048   fprintf(stderr,
1049           _("%s: -%c: %s\n"),
1050           program_name, opt, msg);
1051   this->usage();
1052 }
1053
1054 } // End namespace gold.