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 <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_library(const char*, const char* arg,
 294                                Command_line* cmdline)
 295 {
 296   Input_file_argument file(arg, true, "", false, *this);
 297   cmdline->inputs().add_file(file);
 298 }
 299
 300 #ifdef ENABLE_PLUGINS
 301 void
 302 General_options::parse_plugin(const char*, const char* arg,
 303                               Command_line*)
 304 {
 305   this->add_plugin(arg);
 306 }
 307 #endif // ENABLE_PLUGINS
 308
 309 void
 310 General_options::parse_R(const char* option, const char* arg,
 311                          Command_line* cmdline)
 312 {
 313   struct stat s;
 314   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 315     this->add_to_rpath(arg);
 316   else
 317     this->parse_just_symbols(option, arg, cmdline);
 318 }
 319
 320 void
 321 General_options::parse_just_symbols(const char*, const char* arg,
 322                                     Command_line* cmdline)
 323 {
 324   Input_file_argument file(arg, false, "", true, *this);
 325   cmdline->inputs().add_file(file);
 326 }
 327
 328 void
 329 General_options::parse_static(const char*, const char*, Command_line*)
 330 {
 331   this->set_static(true);
 332 }
 333
 334 void
 335 General_options::parse_script(const char*, const char* arg,
 336                               Command_line* cmdline)
 337 {
 338   if (!read_commandline_script(arg, cmdline))
 339     gold::gold_fatal(_("unable to parse script file %s"), arg);
 340 }
 341
 342 void
 343 General_options::parse_version_script(const char*, const char* arg,
 344                                       Command_line* cmdline)
 345 {
 346   if (!read_version_script(arg, cmdline))
 347     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 348 }
 349
 350 void
 351 General_options::parse_dynamic_list(const char*, const char* arg,
 352                                     Command_line* cmdline)
 353 {
 354   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 355     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 356 }
 357
 358 void
 359 General_options::parse_start_group(const char*, const char*,
 360                                    Command_line* cmdline)
 361 {
 362   cmdline->inputs().start_group();
 363 }
 364
 365 void
 366 General_options::parse_end_group(const char*, const char*,
 367                                  Command_line* cmdline)
 368 {
 369   cmdline->inputs().end_group();
 370 }
 371
 372 } // End namespace gold.
 373
 374 namespace
 375 {
 376
 377 void
 378 usage()
 379 {
 380   fprintf(stderr,
 381           _("%s: use the --help option for usage information\n"),
 382           gold::program_name);
 383   ::exit(EXIT_FAILURE);
 384 }
 385
 386 void
 387 usage(const char* msg, const char *opt)
 388 {
 389   fprintf(stderr,
 390           _("%s: %s: %s\n"),
 391           gold::program_name, opt, msg);
 392   usage();
 393 }
 394
 395 // Recognize input and output target names.  The GNU linker accepts
 396 // these with --format and --oformat.  This code is intended to be
 397 // minimally compatible.  In practice for an ELF target this would be
 398 // the same target as the input files; that name always start with
 399 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 400 // "binary", "ihex".
 401
 402 gold::General_options::Object_format
 403 string_to_object_format(const char* arg)
 404 {
 405   if (strncmp(arg, "elf", 3) == 0)
 406     return gold::General_options::OBJECT_FORMAT_ELF;
 407   else if (strcmp(arg, "binary") == 0)
 408     return gold::General_options::OBJECT_FORMAT_BINARY;
 409   else
 410     {
 411       gold::gold_error(_("format '%s' not supported; treating as elf "
 412                          "(supported formats: elf, binary)"),
 413                        arg);
 414       return gold::General_options::OBJECT_FORMAT_ELF;
 415     }
 416 }
 417
 418 // If the default sysroot is relocatable, try relocating it based on
 419 // the prefix FROM.
 420
 421 char*
 422 get_relative_sysroot(const char* from)
 423 {
 424   char* path = make_relative_prefix(gold::program_name, from,
 425                                     TARGET_SYSTEM_ROOT);
 426   if (path != NULL)
 427     {
 428       struct stat s;
 429       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 430         return path;
 431       free(path);
 432     }
 433
 434   return NULL;
 435 }
 436
 437 // Return the default sysroot.  This is set by the --with-sysroot
 438 // option to configure.  Note we do not free the return value of
 439 // get_relative_sysroot, which is a small memory leak, but is
 440 // necessary since we store this pointer directly in General_options.
 441
 442 const char*
 443 get_default_sysroot()
 444 {
 445   const char* sysroot = TARGET_SYSTEM_ROOT;
 446   if (*sysroot == '\0')
 447     return NULL;
 448
 449   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 450     {
 451       char* path = get_relative_sysroot(BINDIR);
 452       if (path == NULL)
 453         path = get_relative_sysroot(TOOLBINDIR);
 454       if (path != NULL)
 455         return path;
 456     }
 457
 458   return sysroot;
 459 }
 460
 461 // Parse a long option.  Such options have the form
 462 // <-|--><option>[=arg].  If "=arg" is not present but the option
 463 // takes an argument, the next word is taken to the be the argument.
 464 // If equals_only is set, then only the <option>=<arg> form is
 465 // accepted, not the <option><space><arg> form.  Returns a One_option
 466 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 467 // the not-NULL case, *arg is set to the option's argument (NULL if
 468 // the option takes no argument), and *i is advanced past this option.
 469 // NOTE: it is safe for argv and arg to point to the same place.
 470 gold::options::One_option*
 471 parse_long_option(int argc, const char** argv, bool equals_only,
 472                   const char** arg, int* i)
 473 {
 474   const char* const this_argv = argv[*i];
 475
 476   const char* equals = strchr(this_argv, '=');
 477   const char* option_start = this_argv + strspn(this_argv, "-");
 478   std::string option(option_start,
 479                      equals ? equals - option_start : strlen(option_start));
 480
 481   gold::options::Option_map::iterator it
 482       = gold::options::long_options->find(option);
 483   if (it == gold::options::long_options->end())
 484     return NULL;
 485
 486   gold::options::One_option* retval = it->second;
 487
 488   // If the dash-count doesn't match, we fail.
 489   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 490     {
 491       if (retval->dashes != gold::options::DASH_Z)
 492         return NULL;
 493     }
 494   else if (this_argv[1] != '-')   // one dash
 495     {
 496       if (retval->dashes != gold::options::ONE_DASH
 497           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 498           && retval->dashes != gold::options::TWO_DASHES)
 499         return NULL;
 500     }
 501   else                            // two dashes (or more!)
 502     {
 503       if (retval->dashes != gold::options::TWO_DASHES
 504           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 505           && retval->dashes != gold::options::ONE_DASH)
 506         return NULL;
 507     }
 508
 509   // Now that we know the option is good (or else bad in a way that
 510   // will cause us to die), increment i to point past this argv.
 511   ++(*i);
 512
 513   // Figure out the option's argument, if any.
 514   if (!retval->takes_argument())
 515     {
 516       if (equals)
 517         usage(_("unexpected argument"), this_argv);
 518       else
 519         *arg = NULL;
 520     }
 521   else
 522     {
 523       if (equals)
 524         *arg = equals + 1;
 525       else if (retval->takes_optional_argument())
 526         *arg = retval->default_value;
 527       else if (*i < argc && !equals_only)
 528         *arg = argv[(*i)++];
 529       else
 530         usage(_("missing argument"), this_argv);
 531     }
 532
 533   return retval;
 534 }
 535
 536 // Parse a short option.  Such options have the form -<option>[arg].
 537 // If "arg" is not present but the option takes an argument, the next
 538 // word is taken to the be the argument.  If the option does not take
 539 // an argument, it may be followed by another short option.  Returns a
 540 // One_option struct or NULL if argv[i] cannot be parsed as a short
 541 // option.  In the not-NULL case, *arg is set to the option's argument
 542 // (NULL if the option takes no argument), and *i is advanced past
 543 // this option.  This function keeps *i the same if we parsed a short
 544 // option that does not take an argument, that looks to be followed by
 545 // another short option in the same word.
 546 gold::options::One_option*
 547 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 548                    const char** arg, int* i)
 549 {
 550   const char* const this_argv = argv[*i];
 551
 552   if (this_argv[0] != '-')
 553     return NULL;
 554
 555   // We handle -z as a special case.
 556   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 557                                           'z', "", "-z", "Z-OPTION", false,
 558                                           NULL);
 559   gold::options::One_option* retval = NULL;
 560   if (this_argv[pos_in_argv_i] == 'z')
 561     retval = &dash_z;
 562   else
 563     {
 564       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 565       if (char_as_int > 0 && char_as_int < 128)
 566         retval = gold::options::short_options[char_as_int];
 567     }
 568
 569   if (retval == NULL)
 570     return NULL;
 571
 572   // Figure out the option's argument, if any.
 573   if (!retval->takes_argument())
 574     {
 575       *arg = NULL;
 576       // We only advance past this argument if it's the only one in argv.
 577       if (this_argv[pos_in_argv_i + 1] == '\0')
 578         ++(*i);
 579     }
 580   else
 581     {
 582       // If we take an argument, we'll eat up this entire argv entry.
 583       ++(*i);
 584       if (this_argv[pos_in_argv_i + 1] != '\0')
 585         *arg = this_argv + pos_in_argv_i + 1;
 586       else if (retval->takes_optional_argument())
 587         *arg = retval->default_value;
 588       else if (*i < argc)
 589         *arg = argv[(*i)++];
 590       else
 591         usage(_("missing argument"), this_argv);
 592     }
 593
 594   // If we're a -z option, we need to parse our argument as a
 595   // long-option, e.g. "-z stacksize=8192".
 596   if (retval == &dash_z)
 597     {
 598       int dummy_i = 0;
 599       const char* dash_z_arg = *arg;
 600       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 601       if (retval == NULL)
 602         usage(_("unknown -z option"), dash_z_arg);
 603     }
 604
 605   return retval;
 606 }
 607
 608 } // End anonymous namespace.
 609
 610 namespace gold
 611 {
 612
 613 General_options::General_options()
 614   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 615     do_demangle_(false), plugins_()
 616 {
 617 }
 618
 619 General_options::Object_format
 620 General_options::format_enum() const
 621 {
 622   return string_to_object_format(this->format());
 623 }
 624
 625 General_options::Object_format
 626 General_options::oformat_enum() const
 627 {
 628   return string_to_object_format(this->oformat());
 629 }
 630
 631 // Add the sysroot, if any, to the search paths.
 632
 633 void
 634 General_options::add_sysroot()
 635 {
 636   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 637     {
 638       this->set_sysroot(get_default_sysroot());
 639       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 640         return;
 641     }
 642
 643   char* canonical_sysroot = lrealpath(this->sysroot());
 644
 645   for (Dir_list::iterator p = this->library_path_.value.begin();
 646        p != this->library_path_.value.end();
 647        ++p)
 648     p->add_sysroot(this->sysroot(), canonical_sysroot);
 649
 650   free(canonical_sysroot);
 651 }
 652
 653 // Add a plugin and its arguments to the list of plugins.
 654
 655 void
 656 General_options::add_plugin(const char* arg)
 657 {
 658   if (this->plugins_ == NULL)
 659     this->plugins_ = new Plugin_manager(*this);
 660   this->plugins_->add_plugin(arg);
 661 }
 662
 663 // Set up variables and other state that isn't set up automatically by
 664 // the parse routine, and ensure options don't contradict each other
 665 // and are otherwise kosher.
 666
 667 void
 668 General_options::finalize()
 669 {
 670   // Normalize the strip modifiers.  They have a total order:
 671   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
 672   // If one is true, set all beneath it to true as well.
 673   if (this->strip_all())
 674     this->set_strip_debug(true);
 675   if (this->strip_debug())
 676     this->set_strip_debug_non_line(true);
 677   if (this->strip_debug_non_line())
 678     this->set_strip_debug_gdb(true);
 679
 680   // If the user specifies both -s and -r, convert the -s to -S.
 681   // -r requires us to keep externally visible symbols!
 682   if (this->strip_all() && this->relocatable())
 683     {
 684       this->set_strip_all(false);
 685       gold_assert(this->strip_debug());
 686     }
 687
 688   // For us, -dc and -dp are synonyms for --define-common.
 689   if (this->dc())
 690     this->set_define_common(true);
 691   if (this->dp())
 692     this->set_define_common(true);
 693
 694   // We also set --define-common if we're not relocatable, as long as
 695   // the user didn't explicitly ask for something different.
 696   if (!this->user_set_define_common())
 697     this->set_define_common(!this->relocatable());
 698
 699   // execstack_status_ is a three-state variable; update it based on
 700   // -z [no]execstack.
 701   if (this->execstack())
 702     this->set_execstack_status(EXECSTACK_YES);
 703   else if (this->noexecstack())
 704     this->set_execstack_status(EXECSTACK_NO);
 705
 706   // Handle the optional argument for --demangle.
 707   if (this->user_set_demangle())
 708     {
 709       this->set_do_demangle(true);
 710       const char* style = this->demangle();
 711       if (*style != '\0')
 712         {
 713           enum demangling_styles style_code;
 714
 715           style_code = cplus_demangle_name_to_style(style);
 716           if (style_code == unknown_demangling)
 717             gold_fatal("unknown demangling style '%s'", style);
 718           cplus_demangle_set_style(style_code);
 719         }
 720     }
 721   else if (this->user_set_no_demangle())
 722     this->set_do_demangle(false);
 723   else
 724     {
 725       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 726       // behaviour identical to that of gcc's linker wrapper.
 727       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 728     }
 729
 730   // -M is equivalent to "-Map -".
 731   if (this->print_map() && !this->user_set_Map())
 732     {
 733       this->set_Map("-");
 734       this->set_user_set_Map();
 735     }
 736
 737   // Using -n or -N implies -static.
 738   if (this->nmagic() || this->omagic())
 739     this->set_static(true);
 740
 741   // If --thread_count is specified, it applies to
 742   // --thread-count-{initial,middle,final}, though it doesn't override
 743   // them.
 744   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 745     this->set_thread_count_initial(this->thread_count());
 746   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 747     this->set_thread_count_middle(this->thread_count());
 748   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 749     this->set_thread_count_final(this->thread_count());
 750
 751   // Let's warn if you set the thread-count but we're going to ignore it.
 752 #ifndef ENABLE_THREADS
 753   if (this->threads())
 754     {
 755       gold_warning(_("ignoring --threads: "
 756                      "%s was compiled without thread support"),
 757                    program_name);
 758       this->set_threads(false);
 759     }
 760   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 761       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 762     gold_warning(_("ignoring --thread-count: "
 763                    "%s was compiled without thread support"),
 764                  program_name);
 765 #endif
 766
 767   if (this->user_set_Y())
 768     {
 769       std::string s = this->Y();
 770       if (s.compare(0, 2, "P,") == 0)
 771         s.erase(0, 2);
 772
 773       size_t pos = 0;
 774       size_t next_pos;
 775       do
 776         {
 777           next_pos = s.find(':', pos);
 778           size_t len = (next_pos == std::string::npos
 779                         ? next_pos
 780                         : next_pos - pos);
 781           if (len != 0)
 782             this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
 783           pos = next_pos + 1;
 784         }
 785       while (next_pos != std::string::npos);
 786     }
 787   else
 788     {
 789       // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 790       // FIXME: We should only do this when configured in native mode.
 791       this->add_to_library_path_with_sysroot("/lib");
 792       this->add_to_library_path_with_sysroot("/usr/lib");
 793     }
 794
 795   if (this->shared() && !this->user_set_allow_shlib_undefined())
 796     this->set_allow_shlib_undefined(true);
 797
 798   // Normalize library_path() by adding the sysroot to all directories
 799   // in the path, as appropriate.
 800   this->add_sysroot();
 801
 802   // Now that we've normalized the options, check for contradictory ones.
 803   if (this->shared() && this->is_static())
 804     gold_fatal(_("-shared and -static are incompatible"));
 805
 806   if (this->shared() && this->relocatable())
 807     gold_fatal(_("-shared and -r are incompatible"));
 808
 809   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 810       && (this->shared() || this->relocatable()))
 811     gold_fatal(_("binary output format not compatible with -shared or -r"));
 812
 813   if (this->user_set_hash_bucket_empty_fraction()
 814       && (this->hash_bucket_empty_fraction() < 0.0
 815           || this->hash_bucket_empty_fraction() >= 1.0))
 816     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 817                  "[0.0, 1.0)"),
 818                this->hash_bucket_empty_fraction());
 819
 820   // FIXME: we can/should be doing a lot more sanity checking here.
 821 }
 822
 823 // Search_directory methods.
 824
 825 // This is called if we have a sysroot.  Apply the sysroot if
 826 // appropriate.  Record whether the directory is in the sysroot.
 827
 828 void
 829 Search_directory::add_sysroot(const char* sysroot,
 830                               const char* canonical_sysroot)
 831 {
 832   gold_assert(*sysroot != '\0');
 833   if (this->put_in_sysroot_)
 834     {
 835       if (!IS_DIR_SEPARATOR(this->name_[0])
 836           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 837         this->name_ = '/' + this->name_;
 838       this->name_ = sysroot + this->name_;
 839       this->is_in_sysroot_ = true;
 840     }
 841   else
 842     {
 843       // Check whether this entry is in the sysroot.  To do this
 844       // correctly, we need to use canonical names.  Otherwise we will
 845       // get confused by the ../../.. paths that gcc tends to use.
 846       char* canonical_name = lrealpath(this->name_.c_str());
 847       int canonical_name_len = strlen(canonical_name);
 848       int canonical_sysroot_len = strlen(canonical_sysroot);
 849       if (canonical_name_len > canonical_sysroot_len
 850           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 851         {
 852           canonical_name[canonical_sysroot_len] = '\0';
 853           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 854             this->is_in_sysroot_ = true;
 855         }
 856       free(canonical_name);
 857     }
 858 }
 859
 860 // Input_arguments methods.
 861
 862 // Add a file to the list.
 863
 864 void
 865 Input_arguments::add_file(const Input_file_argument& file)
 866 {
 867   if (!this->in_group_)
 868     this->input_argument_list_.push_back(Input_argument(file));
 869   else
 870     {
 871       gold_assert(!this->input_argument_list_.empty());
 872       gold_assert(this->input_argument_list_.back().is_group());
 873       this->input_argument_list_.back().group()->add_file(file);
 874     }
 875 }
 876
 877 // Start a group.
 878
 879 void
 880 Input_arguments::start_group()
 881 {
 882   if (this->in_group_)
 883     gold_fatal(_("May not nest groups"));
 884   Input_file_group* group = new Input_file_group();
 885   this->input_argument_list_.push_back(Input_argument(group));
 886   this->in_group_ = true;
 887 }
 888
 889 // End a group.
 890
 891 void
 892 Input_arguments::end_group()
 893 {
 894   if (!this->in_group_)
 895     gold_fatal(_("Group end without group start"));
 896   this->in_group_ = false;
 897 }
 898
 899 // Command_line options.
 900
 901 Command_line::Command_line()
 902 {
 903 }
 904
 905 // Process the command line options.  For process_one_option, i is the
 906 // index of argv to process next, and must be an option (that is,
 907 // start with a dash).  The return value is the index of the next
 908 // option to process (i+1 or i+2, or argc to indicate processing is
 909 // done).  no_more_options is set to true if (and when) "--" is seen
 910 // as an option.
 911
 912 int
 913 Command_line::process_one_option(int argc, const char** argv, int i,
 914                                  bool* no_more_options)
 915 {
 916   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 917
 918   // If we are reading "--", then just set no_more_options and return.
 919   if (argv[i][1] == '-' && argv[i][2] == '\0')
 920     {
 921       *no_more_options = true;
 922       return i + 1;
 923     }
 924
 925   int new_i = i;
 926   options::One_option* option = NULL;
 927   const char* arg = NULL;
 928
 929   // First, try to process argv as a long option.
 930   option = parse_long_option(argc, argv, false, &arg, &new_i);
 931   if (option)
 932     {
 933       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 934       return new_i;
 935     }
 936
 937   // Now, try to process argv as a short option.  Since several short
 938   // options can be combined in one argv, we may have to parse a lot
 939   // until we're done reading this argv.
 940   int pos_in_argv_i = 1;
 941   while (new_i == i)
 942     {
 943       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 944       if (!option)
 945         break;
 946       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 947       ++pos_in_argv_i;
 948     }
 949   if (option)
 950     return new_i;
 951
 952   // I guess it's neither a long option nor a short option.
 953   usage(_("unknown option"), argv[i]);
 954   return argc;
 955 }
 956
 957
 958 void
 959 Command_line::process(int argc, const char** argv)
 960 {
 961   bool no_more_options = false;
 962   int i = 0;
 963   while (i < argc)
 964     {
 965       this->position_options_.copy_from_options(this->options());
 966       if (no_more_options || argv[i][0] != '-')
 967         {
 968           Input_file_argument file(argv[i], false, "", false,
 969                                    this->position_options_);
 970           this->inputs_.add_file(file);
 971           ++i;
 972         }
 973       else
 974         i = process_one_option(argc, argv, i, &no_more_options);
 975     }
 976
 977   if (this->inputs_.in_group())
 978     {
 979       fprintf(stderr, _("%s: missing group end\n"), program_name);
 980       usage();
 981     }
 982
 983   // Normalize the options and ensure they don't contradict each other.
 984   this->options_.finalize();
 985 }
 986
 987 } // End namespace gold.