gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #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 "script.h"
  33 #include "options.h"
  34
  35 namespace gold
  36 {
  37
  38 // The information we keep for a single command line option.
  39
  40 struct options::One_option
  41 {
  42   // The single character option name, or '\0' if this is only a long
  43   // option.
  44   char short_option;
  45
  46   // The long option name, or NULL if this is only a short option.
  47   const char* long_option;
  48
  49   // Description of the option for --help output, or NULL if there is none.
  50   const char* doc;
  51
  52   // How to print the option name in --help output, or NULL to use the
  53   // default.
  54   const char* help_output;
  55
  56   // Long option dash control.  This is ignored if long_option is
  57   // NULL.
  58   enum
  59     {
  60       // Long option normally takes one dash; two dashes are also
  61       // accepted.
  62       ONE_DASH,
  63       // Long option normally takes two dashes; one dash is also
  64       // accepted.
  65       TWO_DASHES,
  66       // Long option always takes two dashes.
  67       EXACTLY_TWO_DASHES
  68     } dash;
  69
  70   // Function for special handling, or NULL.  Returns the number of
  71   // arguments to skip.  This will normally be at least 1, but it may
  72   // be 0 if this function changes *argv.  ARG points to the location
  73   // in *ARGV where the option starts, which may be helpful for a
  74   // short option.
  75   int (*special)(int argc, char** argv, char *arg, bool long_option,
  76                  Command_line*);
  77
  78   // If this is a position independent option which does not take an
  79   // argument, this is the member function to call to record it.
  80   void (General_options::*general_noarg)();
  81
  82   // If this is a position independent function which takes an
  83   // argument, this is the member function to call to record it.
  84   void (General_options::*general_arg)(const char*);
  85
  86   // If this is a position dependent option which does not take an
  87   // argument, this is the member function to call to record it.
  88   void (Position_dependent_options::*dependent_noarg)();
  89
  90   // If this is a position dependent option which takes an argument,
  91   // this is the member function to record it.
  92   void (Position_dependent_options::*dependent_arg)(const char*);
  93
  94   // Return whether this option takes an argument.
  95   bool
  96   takes_argument() const
  97   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  98 };
  99
 100 // We have a separate table for -z options.
 101
 102 struct options::One_z_option
 103 {
 104   // The name of the option.
 105   const char* name;
 106
 107   // The member function in General_options called to record it.
 108   void (General_options::*set)();
 109 };
 110
 111 // We have a separate table for --debug options.
 112
 113 struct options::One_debug_option
 114 {
 115   // The name of the option.
 116   const char* name;
 117
 118   // The flags to turn on.
 119   unsigned int debug_flags;
 120 };
 121
 122 class options::Command_line_options
 123 {
 124  public:
 125   static const One_option options[];
 126   static const int options_size;
 127   static const One_z_option z_options[];
 128   static const int z_options_size;
 129   static const One_debug_option debug_options[];
 130   static const int debug_options_size;
 131 };
 132
 133 } // End namespace gold.
 134
 135 namespace
 136 {
 137
 138 // Handle the special -l option, which adds an input file.
 139
 140 int
 141 library(int argc, char** argv, char* arg, bool long_option,
 142         gold::Command_line* cmdline)
 143 {
 144   return cmdline->process_l_option(argc, argv, arg, long_option);
 145 }
 146
 147 // Handle the special -T/--script option, which reads a linker script.
 148
 149 int
 150 invoke_script(int argc, char** argv, char* arg, bool long_option,
 151               gold::Command_line* cmdline)
 152 {
 153   int ret;
 154   const char* script_name = cmdline->get_special_argument("script", argc, argv,
 155                                                           arg, long_option,
 156                                                           &ret);
 157   if (!read_commandline_script(script_name, cmdline))
 158     gold::gold_error(_("unable to parse script file %s"), script_name);
 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_ARG('\0', "defsym", N_("Define a symbol"),
 391               N_("--defsym SYMBOL=EXPRESSION"), TWO_DASHES,
 392               &General_options::define_symbol),
 393   GENERAL_NOARG('\0', "demangle", N_("Demangle C++ symbols in log messages"),
 394                 NULL, TWO_DASHES, &General_options::set_demangle),
 395   GENERAL_NOARG('\0', "no-demangle",
 396                 N_("Do not demangle C++ symbols in log messages"),
 397                 NULL, TWO_DASHES, &General_options::clear_demangle),
 398   GENERAL_NOARG('\0', "detect-odr-violations",
 399                 N_("Try to detect violations of the One Definition Rule"),
 400                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 401   GENERAL_ARG('e', "entry", N_("Set program start address"),
 402               N_("-e ADDRESS, --entry ADDRESS"), TWO_DASHES,
 403               &General_options::set_entry),
 404   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 405                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 406   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 407                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 408   GENERAL_ARG('h', "soname", N_("Set shared library name"),
 409               N_("-h FILENAME, -soname FILENAME"), ONE_DASH,
 410               &General_options::set_soname),
 411   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 412               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 413               &General_options::set_dynamic_linker),
 414   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 415           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 416           &library),
 417   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 418               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 419               &General_options::add_to_search_path),
 420   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 421               &General_options::ignore),
 422   GENERAL_ARG('o', "output", N_("Set output file name"),
 423               N_("-o FILE, --output FILE"), TWO_DASHES,
 424               &General_options::set_output_file_name),
 425   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 426               N_("-O level"), ONE_DASH,
 427               &General_options::set_optimization_level),
 428   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 429                 ONE_DASH, &General_options::set_relocatable),
 430   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 431               N_("-R DIR, -rpath DIR"), ONE_DASH,
 432               &General_options::add_to_rpath),
 433   GENERAL_ARG('\0', "rpath-link",
 434               N_("Add DIR to link time shared library search path"),
 435               N_("--rpath-link DIR"), TWO_DASHES,
 436               &General_options::add_to_rpath_link),
 437   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 438                 TWO_DASHES, &General_options::set_strip_all),
 439   GENERAL_NOARG('\0', "strip-debug-gdb",
 440                 N_("Strip debug symbols that are unused by gdb "
 441                    "(at least versions <= 6.7)"),
 442                 NULL, TWO_DASHES, &General_options::set_strip_debug_gdb),
 443   // This must come after -Sdebug since it's a prefix of it.
 444   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 445                 TWO_DASHES, &General_options::set_strip_debug),
 446   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 447                 NULL, ONE_DASH, &General_options::set_shared),
 448   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 449                 NULL, ONE_DASH, &General_options::set_static),
 450   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 451                 NULL, TWO_DASHES, &General_options::set_stats),
 452   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 453               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 454   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 455               N_("-Ttext ADDRESS"), ONE_DASH,
 456               &General_options::set_text_segment_address),
 457   // This must come after -Ttext since it's a prefix of it.
 458   SPECIAL('T', "script", N_("Read linker script"),
 459           N_("-T FILE, --script FILE"), TWO_DASHES,
 460           &invoke_script),
 461   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 462                 NULL, TWO_DASHES, &General_options::set_threads),
 463   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 464                 NULL, TWO_DASHES, &General_options::clear_threads),
 465   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 466               N_("--thread-count COUNT"), TWO_DASHES,
 467               &General_options::set_thread_count),
 468   GENERAL_ARG('\0', "thread-count-initial",
 469               N_("Number of threads to use in initial pass"),
 470               N_("--thread-count-initial COUNT"), TWO_DASHES,
 471               &General_options::set_thread_count_initial),
 472   GENERAL_ARG('\0', "thread-count-middle",
 473               N_("Number of threads to use in middle pass"),
 474               N_("--thread-count-middle COUNT"), TWO_DASHES,
 475               &General_options::set_thread_count_middle),
 476   GENERAL_ARG('\0', "thread-count-final",
 477               N_("Number of threads to use in final pass"),
 478               N_("--thread-count-final COUNT"), TWO_DASHES,
 479               &General_options::set_thread_count_final),
 480   POSDEP_NOARG('\0', "whole-archive",
 481                N_("Include all archive contents"),
 482                NULL, TWO_DASHES,
 483                &Position_dependent_options::set_whole_archive),
 484   POSDEP_NOARG('\0', "no-whole-archive",
 485                N_("Include only needed archive contents"),
 486                NULL, TWO_DASHES,
 487                &Position_dependent_options::clear_whole_archive),
 488
 489   GENERAL_ARG('z', NULL,
 490               N_("Subcommands as follows:\n\
 491     -z execstack              Mark output as requiring executable stack\n\
 492     -z noexecstack            Mark output as not requiring executable stack"),
 493               N_("-z SUBCOMMAND"), ONE_DASH,
 494               &General_options::handle_z_option),
 495
 496   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 497           TWO_DASHES, &start_group),
 498   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 499           TWO_DASHES, &end_group),
 500   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 501           TWO_DASHES, &help),
 502   SPECIAL('v', "version", N_("Report version information"), NULL,
 503           TWO_DASHES, &version),
 504   GENERAL_ARG('\0', "debug", N_("Turn on debugging (all,task)"),
 505               N_("--debug=TYPE"), TWO_DASHES,
 506               &General_options::handle_debug_option)
 507 };
 508
 509 const int options::Command_line_options::options_size =
 510   sizeof (options) / sizeof (options[0]);
 511
 512 // The -z options.
 513
 514 const options::One_z_option
 515 options::Command_line_options::z_options[] =
 516 {
 517   { "execstack", &General_options::set_execstack },
 518   { "noexecstack", &General_options::set_noexecstack },
 519 };
 520
 521 const int options::Command_line_options::z_options_size =
 522   sizeof(z_options) / sizeof(z_options[0]);
 523
 524 // The --debug options.
 525
 526 const options::One_debug_option
 527 options::Command_line_options::debug_options[] =
 528 {
 529   { "all", DEBUG_ALL },
 530   { "task", DEBUG_TASK },
 531 };
 532
 533 const int options::Command_line_options::debug_options_size =
 534   sizeof(debug_options) / sizeof(debug_options[0]);
 535
 536 // The default values for the general options.
 537
 538 General_options::General_options(Script_options* script_options)
 539   : export_dynamic_(false),
 540     soname_(NULL),
 541     dynamic_linker_(NULL),
 542     search_path_(),
 543     optimization_level_(0),
 544     output_file_name_("a.out"),
 545     is_relocatable_(false),
 546     strip_(STRIP_NONE),
 547     allow_shlib_undefined_(false),
 548     symbolic_(false),
 549     compress_debug_sections_(NO_COMPRESSION),
 550     detect_odr_violations_(false),
 551     create_eh_frame_hdr_(false),
 552     rpath_(),
 553     rpath_link_(),
 554     is_shared_(false),
 555     is_static_(false),
 556     print_stats_(false),
 557     sysroot_(),
 558     text_segment_address_(-1U),   // -1 indicates value not set by user
 559     threads_(false),
 560     thread_count_initial_(0),
 561     thread_count_middle_(0),
 562     thread_count_final_(0),
 563     execstack_(EXECSTACK_FROM_INPUT),
 564     debug_(0),
 565     script_options_(script_options)
 566 {
 567   // We initialize demangle_ based on the environment variable
 568   // COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
 569   // output of the linker, unless COLLECT_NO_DEMANGLE is set in the
 570   // environment.  Acting the same way here lets us provide the same
 571   // interface by default.
 572   this->demangle_ = getenv("COLLECT_NO_DEMANGLE") == NULL;
 573 }
 574
 575 // Handle the --defsym option.
 576
 577 void
 578 General_options::define_symbol(const char* arg)
 579 {
 580   this->script_options_->define_symbol(arg);
 581 }
 582
 583 // Handle the -z option.
 584
 585 void
 586 General_options::handle_z_option(const char* arg)
 587 {
 588   const int z_options_size = options::Command_line_options::z_options_size;
 589   const gold::options::One_z_option* z_options =
 590     gold::options::Command_line_options::z_options;
 591   for (int i = 0; i < z_options_size; ++i)
 592     {
 593       if (strcmp(arg, z_options[i].name) == 0)
 594         {
 595           (this->*(z_options[i].set))();
 596           return;
 597         }
 598     }
 599
 600   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 601           program_name, arg);
 602   ::exit(EXIT_FAILURE);
 603 }
 604
 605 // Handle the --debug option.
 606
 607 void
 608 General_options::handle_debug_option(const char* arg)
 609 {
 610   const int debug_options_size =
 611     options::Command_line_options::debug_options_size;
 612   const gold::options::One_debug_option* debug_options =
 613     options::Command_line_options::debug_options;
 614   for (int i = 0; i < debug_options_size; ++i)
 615     {
 616       if (strcmp(arg, debug_options[i].name) == 0)
 617         {
 618           this->set_debug(debug_options[i].debug_flags);
 619           return;
 620         }
 621     }
 622
 623   fprintf(stderr, _("%s: unrecognized --debug subcommand: %s\n"),
 624           program_name, arg);
 625   ::exit(EXIT_FAILURE);
 626 }
 627
 628 // Add the sysroot, if any, to the search paths.
 629
 630 void
 631 General_options::add_sysroot()
 632 {
 633   if (this->sysroot_.empty())
 634     {
 635       this->sysroot_ = get_default_sysroot();
 636       if (this->sysroot_.empty())
 637         return;
 638     }
 639
 640   const char* sysroot = this->sysroot_.c_str();
 641   char* canonical_sysroot = lrealpath(sysroot);
 642
 643   for (Dir_list::iterator p = this->search_path_.begin();
 644        p != this->search_path_.end();
 645        ++p)
 646     p->add_sysroot(sysroot, canonical_sysroot);
 647
 648   free(canonical_sysroot);
 649 }
 650
 651 // The default values for the position dependent options.
 652
 653 Position_dependent_options::Position_dependent_options()
 654   : do_static_search_(false),
 655     as_needed_(false),
 656     include_whole_archive_(false)
 657 {
 658 }
 659
 660 // Search_directory methods.
 661
 662 // This is called if we have a sysroot.  Apply the sysroot if
 663 // appropriate.  Record whether the directory is in the sysroot.
 664
 665 void
 666 Search_directory::add_sysroot(const char* sysroot,
 667                               const char* canonical_sysroot)
 668 {
 669   gold_assert(*sysroot != '\0');
 670   if (this->put_in_sysroot_)
 671     {
 672       if (!IS_DIR_SEPARATOR(this->name_[0])
 673           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 674         this->name_ = '/' + this->name_;
 675       this->name_ = sysroot + this->name_;
 676       this->is_in_sysroot_ = true;
 677     }
 678   else
 679     {
 680       // Check whether this entry is in the sysroot.  To do this
 681       // correctly, we need to use canonical names.  Otherwise we will
 682       // get confused by the ../../.. paths that gcc tends to use.
 683       char* canonical_name = lrealpath(this->name_.c_str());
 684       int canonical_name_len = strlen(canonical_name);
 685       int canonical_sysroot_len = strlen(canonical_sysroot);
 686       if (canonical_name_len > canonical_sysroot_len
 687           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 688         {
 689           canonical_name[canonical_sysroot_len] = '\0';
 690           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 691             this->is_in_sysroot_ = true;
 692         }
 693       free(canonical_name);
 694     }
 695 }
 696
 697 // Input_arguments methods.
 698
 699 // Add a file to the list.
 700
 701 void
 702 Input_arguments::add_file(const Input_file_argument& file)
 703 {
 704   if (!this->in_group_)
 705     this->input_argument_list_.push_back(Input_argument(file));
 706   else
 707     {
 708       gold_assert(!this->input_argument_list_.empty());
 709       gold_assert(this->input_argument_list_.back().is_group());
 710       this->input_argument_list_.back().group()->add_file(file);
 711     }
 712 }
 713
 714 // Start a group.
 715
 716 void
 717 Input_arguments::start_group()
 718 {
 719   gold_assert(!this->in_group_);
 720   Input_file_group* group = new Input_file_group();
 721   this->input_argument_list_.push_back(Input_argument(group));
 722   this->in_group_ = true;
 723 }
 724
 725 // End a group.
 726
 727 void
 728 Input_arguments::end_group()
 729 {
 730   gold_assert(this->in_group_);
 731   this->in_group_ = false;
 732 }
 733
 734 // Command_line options.
 735
 736 Command_line::Command_line(Script_options* script_options)
 737   : options_(script_options), position_options_(), inputs_()
 738 {
 739 }
 740
 741 // Process the command line options.  For process_one_option,
 742 // i is the index of argv to process next, and the return value
 743 // is the index of the next option to process (i+1 or i+2, or argc
 744 // to indicate processing is done).  no_more_options is set to true
 745 // if (and when) "--" is seen as an option.
 746
 747 int
 748 Command_line::process_one_option(int argc, char** argv, int i,
 749                                  bool* no_more_options)
 750 {
 751   const int options_size = options::Command_line_options::options_size;
 752   const options::One_option* options = options::Command_line_options::options;
 753   gold_assert(i < argc);
 754
 755   if (argv[i][0] != '-' || *no_more_options)
 756     {
 757       this->add_file(argv[i], false);
 758       return i + 1;
 759     }
 760
 761   // Option starting with '-'.
 762   int dashes = 1;
 763   if (argv[i][1] == '-')
 764     {
 765       dashes = 2;
 766       if (argv[i][2] == '\0')
 767         {
 768           *no_more_options = true;
 769           return i + 1;
 770         }
 771     }
 772
 773   // Look for a long option match.
 774   char* opt = argv[i] + dashes;
 775   char first = opt[0];
 776   int skiparg = 0;
 777   char* arg = strchr(opt, '=');
 778   bool argument_with_equals = arg != NULL;
 779   if (arg != NULL)
 780     {
 781       *arg = '\0';
 782       ++arg;
 783     }
 784   else if (i + 1 < argc)
 785     {
 786       arg = argv[i + 1];
 787       skiparg = 1;
 788     }
 789
 790   int j;
 791   for (j = 0; j < options_size; ++j)
 792     {
 793       if (options[j].long_option != NULL
 794           && (dashes == 2
 795           || (options[j].dash
 796               != options::One_option::EXACTLY_TWO_DASHES))
 797           && first == options[j].long_option[0]
 798           && strcmp(opt, options[j].long_option) == 0)
 799         {
 800           if (options[j].special)
 801             {
 802               // Restore the '=' we clobbered above.
 803               if (arg != NULL && skiparg == 0)
 804                 arg[-1] = '=';
 805               i += options[j].special(argc - i, argv + i, opt, true, this);
 806             }
 807           else
 808             {
 809               if (!options[j].takes_argument())
 810                 {
 811                   if (argument_with_equals)
 812                     this->usage(_("unexpected argument"), argv[i]);
 813                   arg = NULL;
 814                   skiparg = 0;
 815                 }
 816               else
 817                 {
 818                   if (arg == NULL)
 819                     this->usage(_("missing argument"), argv[i]);
 820                 }
 821               this->apply_option(options[j], arg);
 822               i += skiparg + 1;
 823             }
 824           break;
 825         }
 826     }
 827   if (j < options_size)
 828     return i;
 829
 830   // If we saw two dashes, we needed to have seen a long option.
 831   if (dashes == 2)
 832     this->usage(_("unknown option"), argv[i]);
 833
 834   // Look for a short option match.  There may be more than one
 835   // short option in a given argument.
 836   bool done = false;
 837   char* s = argv[i] + 1;
 838   ++i;
 839   while (*s != '\0' && !done)
 840     {
 841       char opt = *s;
 842       int j;
 843       for (j = 0; j < options_size; ++j)
 844         {
 845           if (options[j].short_option == opt)
 846             {
 847               if (options[j].special)
 848                 {
 849                   // Undo the argument skip done above.
 850                   --i;
 851                   i += options[j].special(argc - i, argv + i, s, false,
 852                                           this);
 853                   done = true;
 854                 }
 855               else
 856                 {
 857                   arg = NULL;
 858                   if (options[j].takes_argument())
 859                     {
 860                       if (s[1] != '\0')
 861                         {
 862                           arg = s + 1;
 863                           done = true;
 864                         }
 865                       else if (i < argc)
 866                         {
 867                           arg = argv[i];
 868                           ++i;
 869                         }
 870                       else
 871                         this->usage(_("missing argument"), opt);
 872                     }
 873                   this->apply_option(options[j], arg);
 874                 }
 875               break;
 876             }
 877         }
 878
 879       if (j >= options_size)
 880         this->usage(_("unknown option"), *s);
 881
 882       ++s;
 883     }
 884   return i;
 885 }
 886
 887
 888 void
 889 Command_line::process(int argc, char** argv)
 890 {
 891   bool no_more_options = false;
 892   int i = 0;
 893   while (i < argc)
 894     i = process_one_option(argc, argv, i, &no_more_options);
 895
 896   if (this->inputs_.in_group())
 897     {
 898       fprintf(stderr, _("%s: missing group end\n"), program_name);
 899       this->usage();
 900     }
 901
 902   // FIXME: We should only do this when configured in native mode.
 903   this->options_.add_to_search_path_with_sysroot("/lib");
 904   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 905
 906   this->options_.add_sysroot();
 907
 908   // Ensure options don't contradict each other and are otherwise kosher.
 909   this->normalize_options();
 910 }
 911
 912 // Extract an option argument for a special option.  LONGNAME is the
 913 // long name of the option.  This sets *PRET to the return value for
 914 // the special function handler to skip to the next option.
 915
 916 const char*
 917 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 918                                    const char* arg, bool long_option,
 919                                    int *pret)
 920 {
 921   if (long_option)
 922     {
 923       size_t longlen = strlen(longname);
 924       gold_assert(strncmp(arg, longname, longlen) == 0);
 925       arg += longlen;
 926       if (*arg == '=')
 927         {
 928           *pret = 1;
 929           return arg + 1;
 930         }
 931       else if (argc > 1)
 932         {
 933           gold_assert(*arg == '\0');
 934           *pret = 2;
 935           return argv[1];
 936         }
 937     }
 938   else
 939     {
 940       if (arg[1] != '\0')
 941         {
 942           *pret = 1;
 943           return arg + 1;
 944         }
 945       else if (argc > 1)
 946         {
 947           *pret = 2;
 948           return argv[1];
 949         }
 950     }
 951
 952   this->usage(_("missing argument"), arg);
 953 }
 954
 955 // Ensure options don't contradict each other and are otherwise kosher.
 956
 957 void
 958 Command_line::normalize_options()
 959 {
 960   // If the user specifies both -s and -r, convert the -s as -S.
 961   // -r requires us to keep externally visible symbols!
 962   if (this->options_.strip_all() && this->options_.is_relocatable())
 963     {
 964       // Clears the strip_all() status, replacing it with strip_debug().
 965       this->options_.set_strip_debug();
 966     }
 967
 968   // FIXME: we can/should be doing a lot more sanity checking here.
 969 }
 970
 971
 972 // Apply a command line option.
 973
 974 void
 975 Command_line::apply_option(const options::One_option& opt,
 976                            const char* arg)
 977 {
 978   if (arg == NULL)
 979     {
 980       if (opt.general_noarg)
 981         (this->options_.*(opt.general_noarg))();
 982       else if (opt.dependent_noarg)
 983         (this->position_options_.*(opt.dependent_noarg))();
 984       else
 985         gold_unreachable();
 986     }
 987   else
 988     {
 989       if (opt.general_arg)
 990         (this->options_.*(opt.general_arg))(arg);
 991       else if (opt.dependent_arg)
 992         (this->position_options_.*(opt.dependent_arg))(arg);
 993       else
 994         gold_unreachable();
 995     }
 996 }
 997
 998 // Add an input file or library.
 999
1000 void
1001 Command_line::add_file(const char* name, bool is_lib)
1002 {
1003   Input_file_argument file(name, is_lib, "", this->position_options_);
1004   this->inputs_.add_file(file);
1005 }
1006
1007 // Handle the -l option, which requires special treatment.
1008
1009 int
1010 Command_line::process_l_option(int argc, char** argv, char* arg,
1011                                bool long_option)
1012 {
1013   int ret;
1014   const char* libname = this->get_special_argument("library", argc, argv, arg,
1015                                                    long_option, &ret);
1016   this->add_file(libname, true);
1017   return ret;
1018 }
1019
1020 // Handle the --start-group option.
1021
1022 void
1023 Command_line::start_group(const char* arg)
1024 {
1025   if (this->inputs_.in_group())
1026     this->usage(_("may not nest groups"), arg);
1027   this->inputs_.start_group();
1028 }
1029
1030 // Handle the --end-group option.
1031
1032 void
1033 Command_line::end_group(const char* arg)
1034 {
1035   if (!this->inputs_.in_group())
1036     this->usage(_("group end without group start"), arg);
1037   this->inputs_.end_group();
1038 }
1039
1040 // Report a usage error.  */
1041
1042 void
1043 Command_line::usage()
1044 {
1045   fprintf(stderr,
1046           _("%s: use the --help option for usage information\n"),
1047           program_name);
1048   ::exit(EXIT_FAILURE);
1049 }
1050
1051 void
1052 Command_line::usage(const char* msg, const char *opt)
1053 {
1054   fprintf(stderr,
1055           _("%s: %s: %s\n"),
1056           program_name, opt, msg);
1057   this->usage();
1058 }
1059
1060 void
1061 Command_line::usage(const char* msg, char opt)
1062 {
1063   fprintf(stderr,
1064           _("%s: -%c: %s\n"),
1065           program_name, opt, msg);
1066   this->usage();
1067 }
1068
1069 } // End namespace gold.