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(_("unable to parse script file %s\n"), script_name);
 158   return ret;
 159 }
 160
 161 // Handle the special --start-group option.
 162
 163 int
 164 start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 165 {
 166   cmdline->start_group(arg);
 167   return 1;
 168 }
 169
 170 // Handle the special --end-group option.
 171
 172 int
 173 end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 174 {
 175   cmdline->end_group(arg);
 176   return 1;
 177 }
 178
 179 // Report usage information for ld --help, and exit.
 180
 181 int
 182 help(int, char**, char*, bool, gold::Command_line*)
 183 {
 184   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 185
 186   const int options_size = gold::options::Command_line_options::options_size;
 187   const gold::options::One_option* options =
 188     gold::options::Command_line_options::options;
 189   for (int i = 0; i < options_size; ++i)
 190     {
 191       if (options[i].doc == NULL)
 192         continue;
 193
 194       printf("  ");
 195       int len = 2;
 196       bool comma = false;
 197
 198       int j = i;
 199       do
 200         {
 201           if (options[j].help_output != NULL)
 202             {
 203               if (comma)
 204                 {
 205                   printf(", ");
 206                   len += 2;
 207                 }
 208               printf(options[j].help_output);
 209               len += std::strlen(options[i].help_output);
 210               comma = true;
 211             }
 212           else
 213             {
 214               if (options[j].short_option != '\0')
 215                 {
 216                   if (comma)
 217                     {
 218                       printf(", ");
 219                       len += 2;
 220                     }
 221                   printf("-%c", options[j].short_option);
 222                   len += 2;
 223                   comma = true;
 224                 }
 225
 226               if (options[j].long_option != NULL)
 227                 {
 228                   if (comma)
 229                     {
 230                       printf(", ");
 231                       len += 2;
 232                     }
 233                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 234                     {
 235                       printf("-");
 236                       ++len;
 237                     }
 238                   else
 239                     {
 240                       printf("--");
 241                       len += 2;
 242                     }
 243                   printf("%s", options[j].long_option);
 244                   len += std::strlen(options[j].long_option);
 245                   comma = true;
 246                 }
 247             }
 248           ++j;
 249         }
 250       while (j < options_size && options[j].doc == NULL);
 251
 252       if (len >= 30)
 253         {
 254           printf("\n");
 255           len = 0;
 256         }
 257       for (; len < 30; ++len)
 258         std::putchar(' ');
 259
 260       std::puts(options[i].doc);
 261     }
 262
 263   ::exit(EXIT_SUCCESS);
 264
 265   return 0;
 266 }
 267
 268 // Report version information.
 269
 270 int
 271 version(int, char**, char* opt, bool, gold::Command_line*)
 272 {
 273   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 274   ::exit(EXIT_SUCCESS);
 275   return 0;
 276 }
 277
 278 // If the default sysroot is relocatable, try relocating it based on
 279 // the prefix FROM.
 280
 281 char*
 282 get_relative_sysroot(const char* from)
 283 {
 284   char* path = make_relative_prefix(gold::program_name, from,
 285                                     TARGET_SYSTEM_ROOT);
 286   if (path != NULL)
 287     {
 288       struct stat s;
 289       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 290         return path;
 291       free(path);
 292     }
 293
 294   return NULL;
 295 }
 296
 297 // Return the default sysroot.  This is set by the --with-sysroot
 298 // option to configure.
 299
 300 std::string
 301 get_default_sysroot()
 302 {
 303   const char* sysroot = TARGET_SYSTEM_ROOT;
 304   if (*sysroot == '\0')
 305     return "";
 306
 307   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 308     {
 309       char* path = get_relative_sysroot (BINDIR);
 310       if (path == NULL)
 311         path = get_relative_sysroot (TOOLBINDIR);
 312       if (path != NULL)
 313         {
 314           std::string ret = path;
 315           free(path);
 316           return ret;
 317         }
 318     }
 319
 320   return sysroot;
 321 }
 322
 323 } // End anonymous namespace.
 324
 325 namespace gold
 326 {
 327
 328 // Helper macros used to specify the options.  We could also do this
 329 // using constructors, but then g++ would generate code to initialize
 330 // the array.  We want the array to be initialized statically so that
 331 // we get better startup time.
 332
 333 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 334   { short_option, long_option, doc, help, options::One_option::dash, \
 335       NULL, func, NULL, NULL, NULL }
 336 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 337   { short_option, long_option, doc, help, options::One_option::dash, \
 338       NULL, NULL, func, NULL, NULL }
 339 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 340   { short_option, long_option, doc, help, options::One_option::dash, \
 341       NULL,  NULL, NULL, func, NULL }
 342 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 343   { short_option, long_option, doc, help, options::One_option::dash, \
 344       NULL, NULL, NULL, NULL, func }
 345 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 346   { short_option, long_option, doc, help, options::One_option::dash, \
 347       func, NULL, NULL, NULL, NULL }
 348
 349 // Here is the actual list of options which we accept.
 350
 351 const options::One_option
 352 options::Command_line_options::options[] =
 353 {
 354   GENERAL_NOARG('\0', "allow-shlib-undefined",
 355                 N_("Allow unresolved references in shared libraries"),
 356                 NULL, TWO_DASHES,
 357                 &General_options::set_allow_shlib_undefined),
 358   GENERAL_NOARG('\0', "no-allow-shlib-undefined",
 359                 N_("Do not allow unresolved references in shared libraries"),
 360                 NULL, TWO_DASHES,
 361                 &General_options::set_no_allow_shlib_undefined),
 362   POSDEP_NOARG('\0', "as-needed",
 363                N_("Only set DT_NEEDED for dynamic libs if used"),
 364                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 365   POSDEP_NOARG('\0', "no-as-needed",
 366                N_("Always DT_NEEDED for dynamic libs (default)"),
 367                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 368   POSDEP_NOARG('\0', "Bdynamic",
 369                N_("-l searches for shared libraries"),
 370                NULL, ONE_DASH,
 371                &Position_dependent_options::set_dynamic_search),
 372   POSDEP_NOARG('\0', "Bstatic",
 373                N_("-l does not search for shared libraries"),
 374                NULL, ONE_DASH,
 375                &Position_dependent_options::set_static_search),
 376   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 377                 NULL, ONE_DASH, &General_options::set_symbolic),
 378 #ifdef HAVE_ZLIB_H
 379 # define ZLIB_STR  ",zlib"
 380 #else
 381 # define ZLIB_STR  ""
 382 #endif
 383   GENERAL_ARG('\0', "compress-debug-sections",
 384               N_("Compress .debug_* sections in the output file "
 385                  "(default is none)"),
 386               N_("--compress-debug-sections=[none" ZLIB_STR "]"),
 387               TWO_DASHES,
 388               &General_options::set_compress_debug_sections),
 389   GENERAL_NOARG('\0', "demangle", N_("Demangle C++ symbols in log messages"),
 390                 NULL, TWO_DASHES, &General_options::set_demangle),
 391   GENERAL_NOARG('\0', "no-demangle",
 392                 N_("Do not demangle C++ symbols in log messages"),
 393                 NULL, TWO_DASHES, &General_options::clear_demangle),
 394   GENERAL_NOARG('\0', "detect-odr-violations",
 395                 N_("Try to detect violations of the One Definition Rule"),
 396                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 397   GENERAL_ARG('e', "entry", N_("Set program start address"),
 398               N_("-e ADDRESS, --entry ADDRESS"), TWO_DASHES,
 399               &General_options::set_entry),
 400   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 401                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 402   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 403                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 404   GENERAL_ARG('h', "soname", N_("Set shared library name"),
 405               N_("-h FILENAME, -soname FILENAME"), ONE_DASH,
 406               &General_options::set_soname),
 407   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 408               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 409               &General_options::set_dynamic_linker),
 410   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 411           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 412           &library),
 413   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 414               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 415               &General_options::add_to_search_path),
 416   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 417               &General_options::ignore),
 418   GENERAL_ARG('o', "output", N_("Set output file name"),
 419               N_("-o FILE, --output FILE"), TWO_DASHES,
 420               &General_options::set_output_file_name),
 421   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 422               N_("-O level"), ONE_DASH,
 423               &General_options::set_optimization_level),
 424   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 425                 ONE_DASH, &General_options::set_relocatable),
 426   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 427               N_("-R DIR, -rpath DIR"), ONE_DASH,
 428               &General_options::add_to_rpath),
 429   GENERAL_ARG('\0', "rpath-link",
 430               N_("Add DIR to link time shared library search path"),
 431               N_("--rpath-link DIR"), TWO_DASHES,
 432               &General_options::add_to_rpath_link),
 433   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 434                 TWO_DASHES, &General_options::set_strip_all),
 435   GENERAL_NOARG('\0', "strip-debug-gdb",
 436                 N_("Strip debug symbols that are unused by gdb "
 437                    "(at least versions <= 6.7)"),
 438                 NULL, TWO_DASHES, &General_options::set_strip_debug_gdb),
 439   // This must come after -Sdebug since it's a prefix of it.
 440   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 441                 TWO_DASHES, &General_options::set_strip_debug),
 442   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 443                 NULL, ONE_DASH, &General_options::set_shared),
 444   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 445                 NULL, ONE_DASH, &General_options::set_static),
 446   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 447                 NULL, TWO_DASHES, &General_options::set_stats),
 448   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 449               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 450   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 451               N_("-Ttext ADDRESS"), ONE_DASH,
 452               &General_options::set_text_segment_address),
 453   // This must come after -Ttext since it's a prefix of it.
 454   SPECIAL('T', "script", N_("Read linker script"),
 455           N_("-T FILE, --script FILE"), TWO_DASHES,
 456           &invoke_script),
 457   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 458                 NULL, TWO_DASHES, &General_options::set_threads),
 459   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 460                 NULL, TWO_DASHES, &General_options::clear_threads),
 461   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 462               N_("--thread-count COUNT"), TWO_DASHES,
 463               &General_options::set_thread_count),
 464   GENERAL_ARG('\0', "thread-count-initial",
 465               N_("Number of threads to use in initial pass"),
 466               N_("--thread-count-initial COUNT"), TWO_DASHES,
 467               &General_options::set_thread_count_initial),
 468   GENERAL_ARG('\0', "thread-count-middle",
 469               N_("Number of threads to use in middle pass"),
 470               N_("--thread-count-middle COUNT"), TWO_DASHES,
 471               &General_options::set_thread_count_middle),
 472   GENERAL_ARG('\0', "thread-count-final",
 473               N_("Number of threads to use in final pass"),
 474               N_("--thread-count-final COUNT"), TWO_DASHES,
 475               &General_options::set_thread_count_final),
 476   POSDEP_NOARG('\0', "whole-archive",
 477                N_("Include all archive contents"),
 478                NULL, TWO_DASHES,
 479                &Position_dependent_options::set_whole_archive),
 480   POSDEP_NOARG('\0', "no-whole-archive",
 481                N_("Include only needed archive contents"),
 482                NULL, TWO_DASHES,
 483                &Position_dependent_options::clear_whole_archive),
 484
 485   GENERAL_ARG('z', NULL,
 486               N_("Subcommands as follows:\n\
 487     -z execstack              Mark output as requiring executable stack\n\
 488     -z noexecstack            Mark output as not requiring executable stack"),
 489               N_("-z SUBCOMMAND"), ONE_DASH,
 490               &General_options::handle_z_option),
 491
 492   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 493           TWO_DASHES, &start_group),
 494   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 495           TWO_DASHES, &end_group),
 496   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 497           TWO_DASHES, &help),
 498   SPECIAL('v', "version", N_("Report version information"), NULL,
 499           TWO_DASHES, &version),
 500   GENERAL_ARG('\0', "debug", N_("Turn on debugging (all,task)"),
 501               N_("--debug=TYPE"), TWO_DASHES,
 502               &General_options::handle_debug_option)
 503 };
 504
 505 const int options::Command_line_options::options_size =
 506   sizeof (options) / sizeof (options[0]);
 507
 508 // The -z options.
 509
 510 const options::One_z_option
 511 options::Command_line_options::z_options[] =
 512 {
 513   { "execstack", &General_options::set_execstack },
 514   { "noexecstack", &General_options::set_noexecstack },
 515 };
 516
 517 const int options::Command_line_options::z_options_size =
 518   sizeof(z_options) / sizeof(z_options[0]);
 519
 520 // The --debug options.
 521
 522 const options::One_debug_option
 523 options::Command_line_options::debug_options[] =
 524 {
 525   { "all", DEBUG_ALL },
 526   { "task", DEBUG_TASK },
 527 };
 528
 529 const int options::Command_line_options::debug_options_size =
 530   sizeof(debug_options) / sizeof(debug_options[0]);
 531
 532 // The default values for the general options.
 533
 534 General_options::General_options()
 535   : entry_(NULL),
 536     export_dynamic_(false),
 537     soname_(NULL),
 538     dynamic_linker_(NULL),
 539     search_path_(),
 540     optimization_level_(0),
 541     output_file_name_("a.out"),
 542     is_relocatable_(false),
 543     strip_(STRIP_NONE),
 544     allow_shlib_undefined_(false),
 545     symbolic_(false),
 546     compress_debug_sections_(NO_COMPRESSION),
 547     detect_odr_violations_(false),
 548     create_eh_frame_hdr_(false),
 549     rpath_(),
 550     rpath_link_(),
 551     is_shared_(false),
 552     is_static_(false),
 553     print_stats_(false),
 554     sysroot_(),
 555     text_segment_address_(-1U),   // -1 indicates value not set by user
 556     threads_(false),
 557     thread_count_initial_(0),
 558     thread_count_middle_(0),
 559     thread_count_final_(0),
 560     execstack_(EXECSTACK_FROM_INPUT),
 561     debug_(0)
 562 {
 563   // We initialize demangle_ based on the environment variable
 564   // COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
 565   // output of the linker, unless COLLECT_NO_DEMANGLE is set in the
 566   // environment.  Acting the same way here lets us provide the same
 567   // interface by default.
 568   this->demangle_ = getenv("COLLECT_NO_DEMANGLE") == NULL;
 569 }
 570
 571 // The default values for the position dependent options.
 572
 573 Position_dependent_options::Position_dependent_options()
 574   : do_static_search_(false),
 575     as_needed_(false),
 576     include_whole_archive_(false)
 577 {
 578 }
 579
 580 // Handle the -z option.
 581
 582 void
 583 General_options::handle_z_option(const char* arg)
 584 {
 585   const int z_options_size = options::Command_line_options::z_options_size;
 586   const gold::options::One_z_option* z_options =
 587     gold::options::Command_line_options::z_options;
 588   for (int i = 0; i < z_options_size; ++i)
 589     {
 590       if (strcmp(arg, z_options[i].name) == 0)
 591         {
 592           (this->*(z_options[i].set))();
 593           return;
 594         }
 595     }
 596
 597   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 598           program_name, arg);
 599   ::exit(EXIT_FAILURE);
 600 }
 601
 602 // Handle the --debug option.
 603
 604 void
 605 General_options::handle_debug_option(const char* arg)
 606 {
 607   const int debug_options_size =
 608     options::Command_line_options::debug_options_size;
 609   const gold::options::One_debug_option* debug_options =
 610     options::Command_line_options::debug_options;
 611   for (int i = 0; i < debug_options_size; ++i)
 612     {
 613       if (strcmp(arg, debug_options[i].name) == 0)
 614         {
 615           this->set_debug(debug_options[i].debug_flags);
 616           return;
 617         }
 618     }
 619
 620   fprintf(stderr, _("%s: unrecognized --debug subcommand: %s\n"),
 621           program_name, arg);
 622   ::exit(EXIT_FAILURE);
 623 }
 624
 625 // Add the sysroot, if any, to the search paths.
 626
 627 void
 628 General_options::add_sysroot()
 629 {
 630   if (this->sysroot_.empty())
 631     {
 632       this->sysroot_ = get_default_sysroot();
 633       if (this->sysroot_.empty())
 634         return;
 635     }
 636
 637   const char* sysroot = this->sysroot_.c_str();
 638   char* canonical_sysroot = lrealpath(sysroot);
 639
 640   for (Dir_list::iterator p = this->search_path_.begin();
 641        p != this->search_path_.end();
 642        ++p)
 643     p->add_sysroot(sysroot, canonical_sysroot);
 644
 645   free(canonical_sysroot);
 646 }
 647
 648 // Search_directory methods.
 649
 650 // This is called if we have a sysroot.  Apply the sysroot if
 651 // appropriate.  Record whether the directory is in the sysroot.
 652
 653 void
 654 Search_directory::add_sysroot(const char* sysroot,
 655                               const char* canonical_sysroot)
 656 {
 657   gold_assert(*sysroot != '\0');
 658   if (this->put_in_sysroot_)
 659     {
 660       if (!IS_DIR_SEPARATOR(this->name_[0])
 661           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 662         this->name_ = '/' + this->name_;
 663       this->name_ = sysroot + this->name_;
 664       this->is_in_sysroot_ = true;
 665     }
 666   else
 667     {
 668       // Check whether this entry is in the sysroot.  To do this
 669       // correctly, we need to use canonical names.  Otherwise we will
 670       // get confused by the ../../.. paths that gcc tends to use.
 671       char* canonical_name = lrealpath(this->name_.c_str());
 672       int canonical_name_len = strlen(canonical_name);
 673       int canonical_sysroot_len = strlen(canonical_sysroot);
 674       if (canonical_name_len > canonical_sysroot_len
 675           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 676         {
 677           canonical_name[canonical_sysroot_len] = '\0';
 678           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 679             this->is_in_sysroot_ = true;
 680         }
 681       free(canonical_name);
 682     }
 683 }
 684
 685 // Input_arguments methods.
 686
 687 // Add a file to the list.
 688
 689 void
 690 Input_arguments::add_file(const Input_file_argument& file)
 691 {
 692   if (!this->in_group_)
 693     this->input_argument_list_.push_back(Input_argument(file));
 694   else
 695     {
 696       gold_assert(!this->input_argument_list_.empty());
 697       gold_assert(this->input_argument_list_.back().is_group());
 698       this->input_argument_list_.back().group()->add_file(file);
 699     }
 700 }
 701
 702 // Start a group.
 703
 704 void
 705 Input_arguments::start_group()
 706 {
 707   gold_assert(!this->in_group_);
 708   Input_file_group* group = new Input_file_group();
 709   this->input_argument_list_.push_back(Input_argument(group));
 710   this->in_group_ = true;
 711 }
 712
 713 // End a group.
 714
 715 void
 716 Input_arguments::end_group()
 717 {
 718   gold_assert(this->in_group_);
 719   this->in_group_ = false;
 720 }
 721
 722 // Command_line options.
 723
 724 Command_line::Command_line()
 725   : options_(), position_options_(), inputs_()
 726 {
 727 }
 728
 729 // Process the command line options.  For process_one_option,
 730 // i is the index of argv to process next, and the return value
 731 // is the index of the next option to process (i+1 or i+2, or argc
 732 // to indicate processing is done).  no_more_options is set to true
 733 // if (and when) "--" is seen as an option.
 734
 735 int
 736 Command_line::process_one_option(int argc, char** argv, int i,
 737                                  bool* no_more_options)
 738 {
 739   const int options_size = options::Command_line_options::options_size;
 740   const options::One_option* options = options::Command_line_options::options;
 741   gold_assert(i < argc);
 742
 743   if (argv[i][0] != '-' || *no_more_options)
 744     {
 745       this->add_file(argv[i], false);
 746       return i + 1;
 747     }
 748
 749   // Option starting with '-'.
 750   int dashes = 1;
 751   if (argv[i][1] == '-')
 752     {
 753       dashes = 2;
 754       if (argv[i][2] == '\0')
 755         {
 756           *no_more_options = true;
 757           return i + 1;
 758         }
 759     }
 760
 761   // Look for a long option match.
 762   char* opt = argv[i] + dashes;
 763   char first = opt[0];
 764   int skiparg = 0;
 765   char* arg = strchr(opt, '=');
 766   bool argument_with_equals = arg != NULL;
 767   if (arg != NULL)
 768     {
 769       *arg = '\0';
 770       ++arg;
 771     }
 772   else if (i + 1 < argc)
 773     {
 774       arg = argv[i + 1];
 775       skiparg = 1;
 776     }
 777
 778   int j;
 779   for (j = 0; j < options_size; ++j)
 780     {
 781       if (options[j].long_option != NULL
 782           && (dashes == 2
 783           || (options[j].dash
 784               != options::One_option::EXACTLY_TWO_DASHES))
 785           && first == options[j].long_option[0]
 786           && strcmp(opt, options[j].long_option) == 0)
 787         {
 788           if (options[j].special)
 789             {
 790               // Restore the '=' we clobbered above.
 791               if (arg != NULL && skiparg == 0)
 792                 arg[-1] = '=';
 793               i += options[j].special(argc - i, argv + i, opt, true, this);
 794             }
 795           else
 796             {
 797               if (!options[j].takes_argument())
 798                 {
 799                   if (argument_with_equals)
 800                     this->usage(_("unexpected argument"), argv[i]);
 801                   arg = NULL;
 802                   skiparg = 0;
 803                 }
 804               else
 805                 {
 806                   if (arg == NULL)
 807                     this->usage(_("missing argument"), argv[i]);
 808                 }
 809               this->apply_option(options[j], arg);
 810               i += skiparg + 1;
 811             }
 812           break;
 813         }
 814     }
 815   if (j < options_size)
 816     return i;
 817
 818   // If we saw two dashes, we needed to have seen a long option.
 819   if (dashes == 2)
 820     this->usage(_("unknown option"), argv[i]);
 821
 822   // Look for a short option match.  There may be more than one
 823   // short option in a given argument.
 824   bool done = false;
 825   char* s = argv[i] + 1;
 826   ++i;
 827   while (*s != '\0' && !done)
 828     {
 829       char opt = *s;
 830       int j;
 831       for (j = 0; j < options_size; ++j)
 832         {
 833           if (options[j].short_option == opt)
 834             {
 835               if (options[j].special)
 836                 {
 837                   // Undo the argument skip done above.
 838                   --i;
 839                   i += options[j].special(argc - i, argv + i, s, false,
 840                                           this);
 841                   done = true;
 842                 }
 843               else
 844                 {
 845                   arg = NULL;
 846                   if (options[j].takes_argument())
 847                     {
 848                       if (s[1] != '\0')
 849                         {
 850                           arg = s + 1;
 851                           done = true;
 852                         }
 853                       else if (i < argc)
 854                         {
 855                           arg = argv[i];
 856                           ++i;
 857                         }
 858                       else
 859                         this->usage(_("missing argument"), opt);
 860                     }
 861                   this->apply_option(options[j], arg);
 862                 }
 863               break;
 864             }
 865         }
 866
 867       if (j >= options_size)
 868         this->usage(_("unknown option"), *s);
 869
 870       ++s;
 871     }
 872   return i;
 873 }
 874
 875
 876 void
 877 Command_line::process(int argc, char** argv)
 878 {
 879   bool no_more_options = false;
 880   int i = 0;
 881   while (i < argc)
 882     i = process_one_option(argc, argv, i, &no_more_options);
 883
 884   if (this->inputs_.in_group())
 885     {
 886       fprintf(stderr, _("%s: missing group end\n"), program_name);
 887       this->usage();
 888     }
 889
 890   // FIXME: We should only do this when configured in native mode.
 891   this->options_.add_to_search_path_with_sysroot("/lib");
 892   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 893
 894   this->options_.add_sysroot();
 895
 896   // Ensure options don't contradict each other and are otherwise kosher.
 897   this->normalize_options();
 898 }
 899
 900 // Extract an option argument for a special option.  LONGNAME is the
 901 // long name of the option.  This sets *PRET to the return value for
 902 // the special function handler to skip to the next option.
 903
 904 const char*
 905 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 906                                    const char* arg, bool long_option,
 907                                    int *pret)
 908 {
 909   if (long_option)
 910     {
 911       size_t longlen = strlen(longname);
 912       gold_assert(strncmp(arg, longname, longlen) == 0);
 913       arg += longlen;
 914       if (*arg == '=')
 915         {
 916           *pret = 1;
 917           return arg + 1;
 918         }
 919       else if (argc > 1)
 920         {
 921           gold_assert(*arg == '\0');
 922           *pret = 2;
 923           return argv[1];
 924         }
 925     }
 926   else
 927     {
 928       if (arg[1] != '\0')
 929         {
 930           *pret = 1;
 931           return arg + 1;
 932         }
 933       else if (argc > 1)
 934         {
 935           *pret = 2;
 936           return argv[1];
 937         }
 938     }
 939
 940   this->usage(_("missing argument"), arg);
 941 }
 942
 943 // Ensure options don't contradict each other and are otherwise kosher.
 944
 945 void
 946 Command_line::normalize_options()
 947 {
 948   // If the user specifies both -s and -r, convert the -s as -S.
 949   // -r requires us to keep externally visible symbols!
 950   if (this->options_.strip_all() && this->options_.is_relocatable())
 951     {
 952       // Clears the strip_all() status, replacing it with strip_debug().
 953       this->options_.set_strip_debug();
 954     }
 955
 956   // FIXME: we can/should be doing a lot more sanity checking here.
 957 }
 958
 959
 960 // Apply a command line option.
 961
 962 void
 963 Command_line::apply_option(const options::One_option& opt,
 964                            const char* arg)
 965 {
 966   if (arg == NULL)
 967     {
 968       if (opt.general_noarg)
 969         (this->options_.*(opt.general_noarg))();
 970       else if (opt.dependent_noarg)
 971         (this->position_options_.*(opt.dependent_noarg))();
 972       else
 973         gold_unreachable();
 974     }
 975   else
 976     {
 977       if (opt.general_arg)
 978         (this->options_.*(opt.general_arg))(arg);
 979       else if (opt.dependent_arg)
 980         (this->position_options_.*(opt.dependent_arg))(arg);
 981       else
 982         gold_unreachable();
 983     }
 984 }
 985
 986 // Add an input file or library.
 987
 988 void
 989 Command_line::add_file(const char* name, bool is_lib)
 990 {
 991   Input_file_argument file(name, is_lib, "", this->position_options_);
 992   this->inputs_.add_file(file);
 993 }
 994
 995 // Handle the -l option, which requires special treatment.
 996
 997 int
 998 Command_line::process_l_option(int argc, char** argv, char* arg,
 999                                bool long_option)
1000 {
1001   int ret;
1002   const char* libname = this->get_special_argument("library", argc, argv, arg,
1003                                                    long_option, &ret);
1004   this->add_file(libname, true);
1005   return ret;
1006 }
1007
1008 // Handle the --start-group option.
1009
1010 void
1011 Command_line::start_group(const char* arg)
1012 {
1013   if (this->inputs_.in_group())
1014     this->usage(_("may not nest groups"), arg);
1015   this->inputs_.start_group();
1016 }
1017
1018 // Handle the --end-group option.
1019
1020 void
1021 Command_line::end_group(const char* arg)
1022 {
1023   if (!this->inputs_.in_group())
1024     this->usage(_("group end without group start"), arg);
1025   this->inputs_.end_group();
1026 }
1027
1028 // Report a usage error.  */
1029
1030 void
1031 Command_line::usage()
1032 {
1033   fprintf(stderr,
1034           _("%s: use the --help option for usage information\n"),
1035           program_name);
1036   ::exit(EXIT_FAILURE);
1037 }
1038
1039 void
1040 Command_line::usage(const char* msg, const char *opt)
1041 {
1042   fprintf(stderr,
1043           _("%s: %s: %s\n"),
1044           program_name, opt, msg);
1045   this->usage();
1046 }
1047
1048 void
1049 Command_line::usage(const char* msg, char opt)
1050 {
1051   fprintf(stderr,
1052           _("%s: -%c: %s\n"),
1053           program_name, opt, msg);
1054   this->usage();
1055 }
1056
1057 } // End namespace gold.