gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007, 2008, 2009 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 <cstring>
  27 #include <vector>
  28 #include <iostream>
  29 #include <sys/stat.h>
  30 #include "filenames.h"
  31 #include "libiberty.h"
  32 #include "demangle.h"
  33 #include "../bfd/bfdver.h"
  34
  35 #include "debug.h"
  36 #include "script.h"
  37 #include "target-select.h"
  38 #include "options.h"
  39 #include "plugin.h"
  40
  41 namespace gold
  42 {
  43
  44 General_options
  45 Position_dependent_options::default_options_;
  46
  47 namespace options
  48 {
  49
  50 // This global variable is set up as General_options is constructed.
  51 static std::vector<const One_option*> registered_options;
  52
  53 // These are set up at the same time -- the variables that accept one
  54 // dash, two, or require -z.  A single variable may be in more than
  55 // one of thes data structures.
  56 typedef Unordered_map<std::string, One_option*> Option_map;
  57 static Option_map* long_options = NULL;
  58 static One_option* short_options[128];
  59
  60 void
  61 One_option::register_option()
  62 {
  63   registered_options.push_back(this);
  64
  65   // We can't make long_options a static Option_map because we can't
  66   // guarantee that will be initialized before register_option() is
  67   // first called.
  68   if (long_options == NULL)
  69     long_options = new Option_map;
  70
  71   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  72   if (!this->longname.empty())
  73     (*long_options)[this->longname] = this;
  74
  75   const int shortname_as_int = static_cast<int>(this->shortname);
  76   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  77   if (this->shortname != '\0')
  78     short_options[shortname_as_int] = this;
  79 }
  80
  81 void
  82 One_option::print() const
  83 {
  84   bool comma = false;
  85   printf("  ");
  86   int len = 2;
  87   if (this->shortname != '\0')
  88     {
  89       len += printf("-%c", this->shortname);
  90       if (this->helparg)
  91         {
  92           // -z takes long-names only.
  93           gold_assert(this->dashes != DASH_Z);
  94           len += printf(" %s", gettext(this->helparg));
  95         }
  96       comma = true;
  97     }
  98   if (!this->longname.empty()
  99       && !(this->longname[0] == this->shortname
 100            && this->longname[1] == '\0'))
 101     {
 102       if (comma)
 103         len += printf(", ");
 104       switch (this->dashes)
 105         {
 106         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 107           len += printf("-");
 108           break;
 109         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 110           len += printf("--");
 111           break;
 112         case options::DASH_Z:
 113           len += printf("-z ");
 114           break;
 115         default:
 116           gold_unreachable();
 117         }
 118       len += printf("%s", this->longname.c_str());
 119       if (this->helparg)
 120         {
 121           // For most options, we print "--frob FOO".  But for -z
 122           // we print "-z frob=FOO".
 123           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 124                         gettext(this->helparg));
 125         }
 126     }
 127
 128   if (len >= 30)
 129     {
 130       printf("\n");
 131       len = 0;
 132     }
 133   for (; len < 30; ++len)
 134     std::putchar(' ');
 135
 136   // TODO: if we're boolean, add " (default)" when appropriate.
 137   printf("%s\n", gettext(this->helpstring));
 138 }
 139
 140 void
 141 help()
 142 {
 143   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 144
 145   std::vector<const One_option*>::const_iterator it;
 146   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 147     (*it)->print();
 148
 149   // config.guess and libtool.m4 look in ld --help output for the
 150   // string "supported targets".
 151   printf(_("%s: supported targets:"), gold::program_name);
 152   std::vector<const char*> supported_names;
 153   gold::supported_target_names(&supported_names);
 154   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 155        p != supported_names.end();
 156        ++p)
 157     printf(" %s", *p);
 158   printf("\n");
 159
 160   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
 161   const char* report = REPORT_BUGS_TO;
 162   if (*report != '\0')
 163     printf(_("Report bugs to %s\n"), report);
 164 }
 165
 166 // For bool, arg will be NULL (boolean options take no argument);
 167 // we always just set to true.
 168 void
 169 parse_bool(const char*, const char*, bool* retval)
 170 {
 171   *retval = true;
 172 }
 173
 174 void
 175 parse_uint(const char* option_name, const char* arg, int* retval)
 176 {
 177   char* endptr;
 178   *retval = strtol(arg, &endptr, 0);
 179   if (*endptr != '\0' || retval < 0)
 180     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 181                option_name, arg);
 182 }
 183
 184 void
 185 parse_uint64(const char* option_name, const char* arg, uint64_t *retval)
 186 {
 187   char* endptr;
 188   *retval = strtoull(arg, &endptr, 0);
 189   if (*endptr != '\0')
 190     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 191                option_name, arg);
 192 }
 193
 194 void
 195 parse_double(const char* option_name, const char* arg, double* retval)
 196 {
 197   char* endptr;
 198   *retval = strtod(arg, &endptr);
 199   if (*endptr != '\0')
 200     gold_fatal(_("%s: invalid option value "
 201                  "(expected a floating point number): %s"),
 202                option_name, arg);
 203 }
 204
 205 void
 206 parse_string(const char* option_name, const char* arg, const char** retval)
 207 {
 208   if (*arg == '\0')
 209     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 210   *retval = arg;
 211 }
 212
 213 void
 214 parse_optional_string(const char*, const char* arg, const char** retval)
 215 {
 216   *retval = arg;
 217 }
 218
 219 void
 220 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 221 {
 222   retval->push_back(Search_directory(arg, false));
 223 }
 224
 225 void
 226 parse_set(const char*, const char* arg, String_set* retval)
 227 {
 228   retval->insert(std::string(arg));
 229 }
 230
 231 void
 232 parse_choices(const char* option_name, const char* arg, const char** retval,
 233               const char* choices[], int num_choices)
 234 {
 235   for (int i = 0; i < num_choices; i++)
 236     if (strcmp(choices[i], arg) == 0)
 237       {
 238         *retval = arg;
 239         return;
 240       }
 241
 242   // If we get here, the user did not enter a valid choice, so we die.
 243   std::string choices_list;
 244   for (int i = 0; i < num_choices; i++)
 245     {
 246       choices_list += choices[i];
 247       if (i != num_choices - 1)
 248         choices_list += ", ";
 249     }
 250   gold_fatal(_("%s: must take one of the following arguments: %s"),
 251              option_name, choices_list.c_str());
 252 }
 253
 254 } // End namespace options.
 255
 256 // Define the handler for "special" options (set via DEFINE_special).
 257
 258 void
 259 General_options::parse_help(const char*, const char*, Command_line*)
 260 {
 261   options::help();
 262   ::exit(EXIT_SUCCESS);
 263 }
 264
 265 void
 266 General_options::parse_version(const char* opt, const char*, Command_line*)
 267 {
 268   gold::print_version(opt[0] == '-' && opt[1] == 'v');
 269   ::exit(EXIT_SUCCESS);
 270 }
 271
 272 void
 273 General_options::parse_V(const char*, const char*, Command_line*)
 274 {
 275   gold::print_version(true);
 276   printf(_("  Supported targets:\n"));
 277   std::vector<const char*> supported_names;
 278   gold::supported_target_names(&supported_names);
 279   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 280        p != supported_names.end();
 281        ++p)
 282     printf("   %s\n", *p);
 283 }
 284
 285 void
 286 General_options::parse_defsym(const char*, const char* arg,
 287                               Command_line* cmdline)
 288 {
 289   cmdline->script_options().define_symbol(arg);
 290 }
 291
 292 void
 293 General_options::parse_incremental_changed(const char*, const char*,
 294                                            Command_line*)
 295 {
 296   this->implicit_incremental_ = true;
 297   this->incremental_disposition_ = INCREMENTAL_CHANGED;
 298 }
 299
 300 void
 301 General_options::parse_incremental_unchanged(const char*, const char*,
 302                                              Command_line*)
 303 {
 304   this->implicit_incremental_ = true;
 305   this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
 306 }
 307
 308 void
 309 General_options::parse_incremental_unknown(const char*, const char*,
 310                                            Command_line*)
 311 {
 312   this->implicit_incremental_ = true;
 313   this->incremental_disposition_ = INCREMENTAL_CHECK;
 314 }
 315
 316 void
 317 General_options::parse_library(const char*, const char* arg,
 318                                Command_line* cmdline)
 319 {
 320   Input_file_argument file(arg, true, "", false, *this);
 321   cmdline->inputs().add_file(file);
 322 }
 323
 324 #ifdef ENABLE_PLUGINS
 325 void
 326 General_options::parse_plugin(const char*, const char* arg,
 327                               Command_line*)
 328 {
 329   this->add_plugin(arg);
 330 }
 331
 332 // Parse --plugin-opt.
 333
 334 void
 335 General_options::parse_plugin_opt(const char*, const char* arg,
 336                                   Command_line*)
 337 {
 338   this->add_plugin_option(arg);
 339 }
 340 #endif // ENABLE_PLUGINS
 341
 342 void
 343 General_options::parse_R(const char* option, const char* arg,
 344                          Command_line* cmdline)
 345 {
 346   struct stat s;
 347   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 348     this->add_to_rpath(arg);
 349   else
 350     this->parse_just_symbols(option, arg, cmdline);
 351 }
 352
 353 void
 354 General_options::parse_just_symbols(const char*, const char* arg,
 355                                     Command_line* cmdline)
 356 {
 357   Input_file_argument file(arg, false, "", true, *this);
 358   cmdline->inputs().add_file(file);
 359 }
 360
 361 void
 362 General_options::parse_static(const char*, const char*, Command_line*)
 363 {
 364   this->set_static(true);
 365 }
 366
 367 void
 368 General_options::parse_script(const char*, const char* arg,
 369                               Command_line* cmdline)
 370 {
 371   if (!read_commandline_script(arg, cmdline))
 372     gold::gold_fatal(_("unable to parse script file %s"), arg);
 373 }
 374
 375 void
 376 General_options::parse_version_script(const char*, const char* arg,
 377                                       Command_line* cmdline)
 378 {
 379   if (!read_version_script(arg, cmdline))
 380     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 381 }
 382
 383 void
 384 General_options::parse_dynamic_list(const char*, const char* arg,
 385                                     Command_line* cmdline)
 386 {
 387   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 388     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 389 }
 390
 391 void
 392 General_options::parse_start_group(const char*, const char*,
 393                                    Command_line* cmdline)
 394 {
 395   cmdline->inputs().start_group();
 396 }
 397
 398 void
 399 General_options::parse_end_group(const char*, const char*,
 400                                  Command_line* cmdline)
 401 {
 402   cmdline->inputs().end_group();
 403 }
 404
 405 } // End namespace gold.
 406
 407 namespace
 408 {
 409
 410 void
 411 usage()
 412 {
 413   fprintf(stderr,
 414           _("%s: use the --help option for usage information\n"),
 415           gold::program_name);
 416   ::exit(EXIT_FAILURE);
 417 }
 418
 419 void
 420 usage(const char* msg, const char *opt)
 421 {
 422   fprintf(stderr,
 423           _("%s: %s: %s\n"),
 424           gold::program_name, opt, msg);
 425   usage();
 426 }
 427
 428 // Recognize input and output target names.  The GNU linker accepts
 429 // these with --format and --oformat.  This code is intended to be
 430 // minimally compatible.  In practice for an ELF target this would be
 431 // the same target as the input files; that name always start with
 432 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 433 // "binary", "ihex".
 434
 435 gold::General_options::Object_format
 436 string_to_object_format(const char* arg)
 437 {
 438   if (strncmp(arg, "elf", 3) == 0)
 439     return gold::General_options::OBJECT_FORMAT_ELF;
 440   else if (strcmp(arg, "binary") == 0)
 441     return gold::General_options::OBJECT_FORMAT_BINARY;
 442   else
 443     {
 444       gold::gold_error(_("format '%s' not supported; treating as elf "
 445                          "(supported formats: elf, binary)"),
 446                        arg);
 447       return gold::General_options::OBJECT_FORMAT_ELF;
 448     }
 449 }
 450
 451 // If the default sysroot is relocatable, try relocating it based on
 452 // the prefix FROM.
 453
 454 static char*
 455 get_relative_sysroot(const char* from)
 456 {
 457   char* path = make_relative_prefix(gold::program_name, from,
 458                                     TARGET_SYSTEM_ROOT);
 459   if (path != NULL)
 460     {
 461       struct stat s;
 462       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 463         return path;
 464       free(path);
 465     }
 466
 467   return NULL;
 468 }
 469
 470 // Return the default sysroot.  This is set by the --with-sysroot
 471 // option to configure.  Note we do not free the return value of
 472 // get_relative_sysroot, which is a small memory leak, but is
 473 // necessary since we store this pointer directly in General_options.
 474
 475 static const char*
 476 get_default_sysroot()
 477 {
 478   const char* sysroot = TARGET_SYSTEM_ROOT;
 479   if (*sysroot == '\0')
 480     return NULL;
 481
 482   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 483     {
 484       char* path = get_relative_sysroot(BINDIR);
 485       if (path == NULL)
 486         path = get_relative_sysroot(TOOLBINDIR);
 487       if (path != NULL)
 488         return path;
 489     }
 490
 491   return sysroot;
 492 }
 493
 494 // Parse a long option.  Such options have the form
 495 // <-|--><option>[=arg].  If "=arg" is not present but the option
 496 // takes an argument, the next word is taken to the be the argument.
 497 // If equals_only is set, then only the <option>=<arg> form is
 498 // accepted, not the <option><space><arg> form.  Returns a One_option
 499 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 500 // the not-NULL case, *arg is set to the option's argument (NULL if
 501 // the option takes no argument), and *i is advanced past this option.
 502 // NOTE: it is safe for argv and arg to point to the same place.
 503 gold::options::One_option*
 504 parse_long_option(int argc, const char** argv, bool equals_only,
 505                   const char** arg, int* i)
 506 {
 507   const char* const this_argv = argv[*i];
 508
 509   const char* equals = strchr(this_argv, '=');
 510   const char* option_start = this_argv + strspn(this_argv, "-");
 511   std::string option(option_start,
 512                      equals ? equals - option_start : strlen(option_start));
 513
 514   gold::options::Option_map::iterator it
 515       = gold::options::long_options->find(option);
 516   if (it == gold::options::long_options->end())
 517     return NULL;
 518
 519   gold::options::One_option* retval = it->second;
 520
 521   // If the dash-count doesn't match, we fail.
 522   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 523     {
 524       if (retval->dashes != gold::options::DASH_Z)
 525         return NULL;
 526     }
 527   else if (this_argv[1] != '-')   // one dash
 528     {
 529       if (retval->dashes != gold::options::ONE_DASH
 530           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 531           && retval->dashes != gold::options::TWO_DASHES)
 532         return NULL;
 533     }
 534   else                            // two dashes (or more!)
 535     {
 536       if (retval->dashes != gold::options::TWO_DASHES
 537           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 538           && retval->dashes != gold::options::ONE_DASH)
 539         return NULL;
 540     }
 541
 542   // Now that we know the option is good (or else bad in a way that
 543   // will cause us to die), increment i to point past this argv.
 544   ++(*i);
 545
 546   // Figure out the option's argument, if any.
 547   if (!retval->takes_argument())
 548     {
 549       if (equals)
 550         usage(_("unexpected argument"), this_argv);
 551       else
 552         *arg = NULL;
 553     }
 554   else
 555     {
 556       if (equals)
 557         *arg = equals + 1;
 558       else if (retval->takes_optional_argument())
 559         *arg = retval->default_value;
 560       else if (*i < argc && !equals_only)
 561         *arg = argv[(*i)++];
 562       else
 563         usage(_("missing argument"), this_argv);
 564     }
 565
 566   return retval;
 567 }
 568
 569 // Parse a short option.  Such options have the form -<option>[arg].
 570 // If "arg" is not present but the option takes an argument, the next
 571 // word is taken to the be the argument.  If the option does not take
 572 // an argument, it may be followed by another short option.  Returns a
 573 // One_option struct or NULL if argv[i] cannot be parsed as a short
 574 // option.  In the not-NULL case, *arg is set to the option's argument
 575 // (NULL if the option takes no argument), and *i is advanced past
 576 // this option.  This function keeps *i the same if we parsed a short
 577 // option that does not take an argument, that looks to be followed by
 578 // another short option in the same word.
 579 gold::options::One_option*
 580 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 581                    const char** arg, int* i)
 582 {
 583   const char* const this_argv = argv[*i];
 584
 585   if (this_argv[0] != '-')
 586     return NULL;
 587
 588   // We handle -z as a special case.
 589   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 590                                           'z', "", "-z", "Z-OPTION", false,
 591                                           NULL);
 592   gold::options::One_option* retval = NULL;
 593   if (this_argv[pos_in_argv_i] == 'z')
 594     retval = &dash_z;
 595   else
 596     {
 597       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 598       if (char_as_int > 0 && char_as_int < 128)
 599         retval = gold::options::short_options[char_as_int];
 600     }
 601
 602   if (retval == NULL)
 603     return NULL;
 604
 605   // Figure out the option's argument, if any.
 606   if (!retval->takes_argument())
 607     {
 608       *arg = NULL;
 609       // We only advance past this argument if it's the only one in argv.
 610       if (this_argv[pos_in_argv_i + 1] == '\0')
 611         ++(*i);
 612     }
 613   else
 614     {
 615       // If we take an argument, we'll eat up this entire argv entry.
 616       ++(*i);
 617       if (this_argv[pos_in_argv_i + 1] != '\0')
 618         *arg = this_argv + pos_in_argv_i + 1;
 619       else if (retval->takes_optional_argument())
 620         *arg = retval->default_value;
 621       else if (*i < argc)
 622         *arg = argv[(*i)++];
 623       else
 624         usage(_("missing argument"), this_argv);
 625     }
 626
 627   // If we're a -z option, we need to parse our argument as a
 628   // long-option, e.g. "-z stacksize=8192".
 629   if (retval == &dash_z)
 630     {
 631       int dummy_i = 0;
 632       const char* dash_z_arg = *arg;
 633       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 634       if (retval == NULL)
 635         usage(_("unknown -z option"), dash_z_arg);
 636     }
 637
 638   return retval;
 639 }
 640
 641 } // End anonymous namespace.
 642
 643 namespace gold
 644 {
 645
 646 General_options::General_options()
 647   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 648     do_demangle_(false), plugins_(),
 649     incremental_disposition_(INCREMENTAL_CHECK), implicit_incremental_(false)
 650 {
 651 }
 652
 653 General_options::Object_format
 654 General_options::format_enum() const
 655 {
 656   return string_to_object_format(this->format());
 657 }
 658
 659 General_options::Object_format
 660 General_options::oformat_enum() const
 661 {
 662   return string_to_object_format(this->oformat());
 663 }
 664
 665 // Add the sysroot, if any, to the search paths.
 666
 667 void
 668 General_options::add_sysroot()
 669 {
 670   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 671     {
 672       this->set_sysroot(get_default_sysroot());
 673       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 674         return;
 675     }
 676
 677   char* canonical_sysroot = lrealpath(this->sysroot());
 678
 679   for (Dir_list::iterator p = this->library_path_.value.begin();
 680        p != this->library_path_.value.end();
 681        ++p)
 682     p->add_sysroot(this->sysroot(), canonical_sysroot);
 683
 684   free(canonical_sysroot);
 685 }
 686
 687 // Return whether FILENAME is in a system directory.
 688
 689 bool
 690 General_options::is_in_system_directory(const std::string& filename) const
 691 {
 692   for (Dir_list::const_iterator p = this->library_path_.value.begin();
 693        p != this->library_path_.value.end();
 694        ++p)
 695     {
 696       // We use a straight string comparison rather than calling
 697       // FILENAME_CMP because we are only interested in the cases
 698       // where we found the file in a system directory, which means
 699       // that we used the directory name as a prefix for a -L search.
 700       if (p->is_system_directory()
 701           && filename.compare(0, p->name().size(), p->name()) == 0)
 702         return true;
 703     }
 704   return false;
 705 }
 706
 707 // Add a plugin to the list of plugins.
 708
 709 void
 710 General_options::add_plugin(const char* filename)
 711 {
 712   if (this->plugins_ == NULL)
 713     this->plugins_ = new Plugin_manager(*this);
 714   this->plugins_->add_plugin(filename);
 715 }
 716
 717 // Add a plugin option to a plugin.
 718
 719 void
 720 General_options::add_plugin_option(const char* arg)
 721 {
 722   if (this->plugins_ == NULL)
 723     gold_fatal("--plugin-opt requires --plugin.");
 724   this->plugins_->add_plugin_option(arg);
 725 }
 726
 727 // Set up variables and other state that isn't set up automatically by
 728 // the parse routine, and ensure options don't contradict each other
 729 // and are otherwise kosher.
 730
 731 void
 732 General_options::finalize()
 733 {
 734   // Normalize the strip modifiers.  They have a total order:
 735   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
 736   // If one is true, set all beneath it to true as well.
 737   if (this->strip_all())
 738     this->set_strip_debug(true);
 739   if (this->strip_debug())
 740     this->set_strip_debug_non_line(true);
 741   if (this->strip_debug_non_line())
 742     this->set_strip_debug_gdb(true);
 743
 744   if (this->Bshareable())
 745     this->set_shared(true);
 746
 747   // If the user specifies both -s and -r, convert the -s to -S.
 748   // -r requires us to keep externally visible symbols!
 749   if (this->strip_all() && this->relocatable())
 750     {
 751       this->set_strip_all(false);
 752       gold_assert(this->strip_debug());
 753     }
 754
 755   // For us, -dc and -dp are synonyms for --define-common.
 756   if (this->dc())
 757     this->set_define_common(true);
 758   if (this->dp())
 759     this->set_define_common(true);
 760
 761   // We also set --define-common if we're not relocatable, as long as
 762   // the user didn't explicitly ask for something different.
 763   if (!this->user_set_define_common())
 764     this->set_define_common(!this->relocatable());
 765
 766   // execstack_status_ is a three-state variable; update it based on
 767   // -z [no]execstack.
 768   if (this->execstack())
 769     this->set_execstack_status(EXECSTACK_YES);
 770   else if (this->noexecstack())
 771     this->set_execstack_status(EXECSTACK_NO);
 772
 773   // Handle the optional argument for --demangle.
 774   if (this->user_set_demangle())
 775     {
 776       this->set_do_demangle(true);
 777       const char* style = this->demangle();
 778       if (*style != '\0')
 779         {
 780           enum demangling_styles style_code;
 781
 782           style_code = cplus_demangle_name_to_style(style);
 783           if (style_code == unknown_demangling)
 784             gold_fatal("unknown demangling style '%s'", style);
 785           cplus_demangle_set_style(style_code);
 786         }
 787     }
 788   else if (this->user_set_no_demangle())
 789     this->set_do_demangle(false);
 790   else
 791     {
 792       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 793       // behaviour identical to that of gcc's linker wrapper.
 794       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 795     }
 796
 797   // -M is equivalent to "-Map -".
 798   if (this->print_map() && !this->user_set_Map())
 799     {
 800       this->set_Map("-");
 801       this->set_user_set_Map();
 802     }
 803
 804   // Using -n or -N implies -static.
 805   if (this->nmagic() || this->omagic())
 806     this->set_static(true);
 807
 808   // If --thread_count is specified, it applies to
 809   // --thread-count-{initial,middle,final}, though it doesn't override
 810   // them.
 811   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 812     this->set_thread_count_initial(this->thread_count());
 813   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 814     this->set_thread_count_middle(this->thread_count());
 815   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 816     this->set_thread_count_final(this->thread_count());
 817
 818   // Let's warn if you set the thread-count but we're going to ignore it.
 819 #ifndef ENABLE_THREADS
 820   if (this->threads())
 821     {
 822       gold_warning(_("ignoring --threads: "
 823                      "%s was compiled without thread support"),
 824                    program_name);
 825       this->set_threads(false);
 826     }
 827   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 828       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 829     gold_warning(_("ignoring --thread-count: "
 830                    "%s was compiled without thread support"),
 831                  program_name);
 832 #endif
 833
 834   if (this->user_set_Y())
 835     {
 836       std::string s = this->Y();
 837       if (s.compare(0, 2, "P,") == 0)
 838         s.erase(0, 2);
 839
 840       size_t pos = 0;
 841       size_t next_pos;
 842       do
 843         {
 844           next_pos = s.find(':', pos);
 845           size_t len = (next_pos == std::string::npos
 846                         ? next_pos
 847                         : next_pos - pos);
 848           if (len != 0)
 849             this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
 850           pos = next_pos + 1;
 851         }
 852       while (next_pos != std::string::npos);
 853     }
 854   else
 855     {
 856       // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 857       // FIXME: We should only do this when configured in native mode.
 858       this->add_to_library_path_with_sysroot("/lib");
 859       this->add_to_library_path_with_sysroot("/usr/lib");
 860     }
 861
 862   if (this->shared() && !this->user_set_allow_shlib_undefined())
 863     this->set_allow_shlib_undefined(true);
 864
 865   // Normalize library_path() by adding the sysroot to all directories
 866   // in the path, as appropriate.
 867   this->add_sysroot();
 868
 869   // Now that we've normalized the options, check for contradictory ones.
 870   if (this->shared() && this->is_static())
 871     gold_fatal(_("-shared and -static are incompatible"));
 872
 873   if (this->shared() && this->relocatable())
 874     gold_fatal(_("-shared and -r are incompatible"));
 875
 876   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 877       && (this->shared() || this->relocatable()))
 878     gold_fatal(_("binary output format not compatible with -shared or -r"));
 879
 880   if (this->user_set_hash_bucket_empty_fraction()
 881       && (this->hash_bucket_empty_fraction() < 0.0
 882           || this->hash_bucket_empty_fraction() >= 1.0))
 883     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 884                  "[0.0, 1.0)"),
 885                this->hash_bucket_empty_fraction());
 886
 887   if (this->implicit_incremental_ && !this->incremental())
 888     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
 889                  "--incremental-unknown require the use of --incremental"));
 890
 891   // FIXME: we can/should be doing a lot more sanity checking here.
 892 }
 893
 894 // Search_directory methods.
 895
 896 // This is called if we have a sysroot.  Apply the sysroot if
 897 // appropriate.  Record whether the directory is in the sysroot.
 898
 899 void
 900 Search_directory::add_sysroot(const char* sysroot,
 901                               const char* canonical_sysroot)
 902 {
 903   gold_assert(*sysroot != '\0');
 904   if (this->put_in_sysroot_)
 905     {
 906       if (!IS_DIR_SEPARATOR(this->name_[0])
 907           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 908         this->name_ = '/' + this->name_;
 909       this->name_ = sysroot + this->name_;
 910       this->is_in_sysroot_ = true;
 911     }
 912   else
 913     {
 914       // Check whether this entry is in the sysroot.  To do this
 915       // correctly, we need to use canonical names.  Otherwise we will
 916       // get confused by the ../../.. paths that gcc tends to use.
 917       char* canonical_name = lrealpath(this->name_.c_str());
 918       int canonical_name_len = strlen(canonical_name);
 919       int canonical_sysroot_len = strlen(canonical_sysroot);
 920       if (canonical_name_len > canonical_sysroot_len
 921           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 922         {
 923           canonical_name[canonical_sysroot_len] = '\0';
 924           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 925             this->is_in_sysroot_ = true;
 926         }
 927       free(canonical_name);
 928     }
 929 }
 930
 931 // Input_arguments methods.
 932
 933 // Add a file to the list.
 934
 935 void
 936 Input_arguments::add_file(const Input_file_argument& file)
 937 {
 938   if (!this->in_group_)
 939     this->input_argument_list_.push_back(Input_argument(file));
 940   else
 941     {
 942       gold_assert(!this->input_argument_list_.empty());
 943       gold_assert(this->input_argument_list_.back().is_group());
 944       this->input_argument_list_.back().group()->add_file(file);
 945     }
 946 }
 947
 948 // Start a group.
 949
 950 void
 951 Input_arguments::start_group()
 952 {
 953   if (this->in_group_)
 954     gold_fatal(_("May not nest groups"));
 955   Input_file_group* group = new Input_file_group();
 956   this->input_argument_list_.push_back(Input_argument(group));
 957   this->in_group_ = true;
 958 }
 959
 960 // End a group.
 961
 962 void
 963 Input_arguments::end_group()
 964 {
 965   if (!this->in_group_)
 966     gold_fatal(_("Group end without group start"));
 967   this->in_group_ = false;
 968 }
 969
 970 // Command_line options.
 971
 972 Command_line::Command_line()
 973 {
 974 }
 975
 976 // Process the command line options.  For process_one_option, i is the
 977 // index of argv to process next, and must be an option (that is,
 978 // start with a dash).  The return value is the index of the next
 979 // option to process (i+1 or i+2, or argc to indicate processing is
 980 // done).  no_more_options is set to true if (and when) "--" is seen
 981 // as an option.
 982
 983 int
 984 Command_line::process_one_option(int argc, const char** argv, int i,
 985                                  bool* no_more_options)
 986 {
 987   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 988
 989   // If we are reading "--", then just set no_more_options and return.
 990   if (argv[i][1] == '-' && argv[i][2] == '\0')
 991     {
 992       *no_more_options = true;
 993       return i + 1;
 994     }
 995
 996   int new_i = i;
 997   options::One_option* option = NULL;
 998   const char* arg = NULL;
 999
1000   // First, try to process argv as a long option.
1001   option = parse_long_option(argc, argv, false, &arg, &new_i);
1002   if (option)
1003     {
1004       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1005       return new_i;
1006     }
1007
1008   // Now, try to process argv as a short option.  Since several short
1009   // options can be combined in one argv, we may have to parse a lot
1010   // until we're done reading this argv.
1011   int pos_in_argv_i = 1;
1012   while (new_i == i)
1013     {
1014       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1015       if (!option)
1016         break;
1017       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1018       ++pos_in_argv_i;
1019     }
1020   if (option)
1021     return new_i;
1022
1023   // I guess it's neither a long option nor a short option.
1024   usage(_("unknown option"), argv[i]);
1025   return argc;
1026 }
1027
1028
1029 void
1030 Command_line::process(int argc, const char** argv)
1031 {
1032   bool no_more_options = false;
1033   int i = 0;
1034   while (i < argc)
1035     {
1036       this->position_options_.copy_from_options(this->options());
1037       if (no_more_options || argv[i][0] != '-')
1038         {
1039           Input_file_argument file(argv[i], false, "", false,
1040                                    this->position_options_);
1041           this->inputs_.add_file(file);
1042           ++i;
1043         }
1044       else
1045         i = process_one_option(argc, argv, i, &no_more_options);
1046     }
1047
1048   if (this->inputs_.in_group())
1049     {
1050       fprintf(stderr, _("%s: missing group end\n"), program_name);
1051       usage();
1052     }
1053
1054   // Normalize the options and ensure they don't contradict each other.
1055   this->options_.finalize();
1056 }
1057
1058 } // End namespace gold.