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   this->printed_version_ = true;
 277   printf(_("  Supported targets:\n"));
 278   std::vector<const char*> supported_names;
 279   gold::supported_target_names(&supported_names);
 280   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 281        p != supported_names.end();
 282        ++p)
 283     printf("   %s\n", *p);
 284 }
 285
 286 void
 287 General_options::parse_defsym(const char*, const char* arg,
 288                               Command_line* cmdline)
 289 {
 290   cmdline->script_options().define_symbol(arg);
 291 }
 292
 293 void
 294 General_options::parse_incremental_changed(const char*, const char*,
 295                                            Command_line*)
 296 {
 297   this->implicit_incremental_ = true;
 298   this->incremental_disposition_ = INCREMENTAL_CHANGED;
 299 }
 300
 301 void
 302 General_options::parse_incremental_unchanged(const char*, const char*,
 303                                              Command_line*)
 304 {
 305   this->implicit_incremental_ = true;
 306   this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
 307 }
 308
 309 void
 310 General_options::parse_incremental_unknown(const char*, const char*,
 311                                            Command_line*)
 312 {
 313   this->implicit_incremental_ = true;
 314   this->incremental_disposition_ = INCREMENTAL_CHECK;
 315 }
 316
 317 void
 318 General_options::parse_library(const char*, const char* arg,
 319                                Command_line* cmdline)
 320 {
 321   Input_file_argument file(arg, true, "", false, *this);
 322   cmdline->inputs().add_file(file);
 323 }
 324
 325 #ifdef ENABLE_PLUGINS
 326 void
 327 General_options::parse_plugin(const char*, const char* arg,
 328                               Command_line*)
 329 {
 330   this->add_plugin(arg);
 331 }
 332
 333 // Parse --plugin-opt.
 334
 335 void
 336 General_options::parse_plugin_opt(const char*, const char* arg,
 337                                   Command_line*)
 338 {
 339   this->add_plugin_option(arg);
 340 }
 341 #endif // ENABLE_PLUGINS
 342
 343 void
 344 General_options::parse_R(const char* option, const char* arg,
 345                          Command_line* cmdline)
 346 {
 347   struct stat s;
 348   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 349     this->add_to_rpath(arg);
 350   else
 351     this->parse_just_symbols(option, arg, cmdline);
 352 }
 353
 354 void
 355 General_options::parse_just_symbols(const char*, const char* arg,
 356                                     Command_line* cmdline)
 357 {
 358   Input_file_argument file(arg, false, "", true, *this);
 359   cmdline->inputs().add_file(file);
 360 }
 361
 362 void
 363 General_options::parse_static(const char*, const char*, Command_line*)
 364 {
 365   this->set_static(true);
 366 }
 367
 368 void
 369 General_options::parse_script(const char*, const char* arg,
 370                               Command_line* cmdline)
 371 {
 372   if (!read_commandline_script(arg, cmdline))
 373     gold::gold_fatal(_("unable to parse script file %s"), arg);
 374 }
 375
 376 void
 377 General_options::parse_version_script(const char*, const char* arg,
 378                                       Command_line* cmdline)
 379 {
 380   if (!read_version_script(arg, cmdline))
 381     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 382 }
 383
 384 void
 385 General_options::parse_dynamic_list(const char*, const char* arg,
 386                                     Command_line* cmdline)
 387 {
 388   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 389     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 390 }
 391
 392 void
 393 General_options::parse_start_group(const char*, const char*,
 394                                    Command_line* cmdline)
 395 {
 396   cmdline->inputs().start_group();
 397 }
 398
 399 void
 400 General_options::parse_end_group(const char*, const char*,
 401                                  Command_line* cmdline)
 402 {
 403   cmdline->inputs().end_group();
 404 }
 405
 406 // The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
 407 // of names seperated by commas or colons and puts them in a linked list.
 408 // We implement the same parsing of names here but store names in an unordered
 409 // map to speed up searching of names.
 410
 411 void
 412 General_options::parse_exclude_libs(const char*, const char* arg,
 413                                     Command_line*)
 414 {
 415   const char *p = arg;
 416
 417   while (*p != '\0')
 418     {
 419       size_t length = strcspn(p, ",:");
 420       this->excluded_libs_.insert(std::string(p, length));
 421       p += (p[length] ? length + 1 : length);
 422     }
 423 }
 424
 425 // The checking logic is based on the function check_excluded_libs() in
 426 // ld/ldlang.c of GNU ld but our implementation is different because we use
 427 // an unordered map instead of a linked list, which is what GNU ld uses.  GNU
 428 // ld searches sequentially in the excluded libs list.  For a given archive,
 429 // a match is found if the archive's name matches exactly one of the list
 430 // entry or if the archive's name is of the form FOO.a and FOO matches exactly
 431 // one of the list entry.  An entry "ALL" in the list is considered as a
 432 // wild-card and matches any given name.
 433
 434 bool
 435 General_options::check_excluded_libs (const std::string &name) const
 436 {
 437   Unordered_set<std::string>::const_iterator p;
 438
 439   // Exit early for the most common case.
 440   if (excluded_libs_.empty())
 441     return false;
 442
 443   // If we see "ALL", all archives are excluded from automatic export.
 444   p = excluded_libs_.find(std::string("ALL"));
 445   if (p != excluded_libs_.end())
 446     return true;
 447
 448   // First strip off any directories in name.
 449   const char *basename = lbasename(name.c_str());
 450
 451   // Try finding an exact match.
 452   p = excluded_libs_.find(std::string(basename));
 453   if (p != excluded_libs_.end())
 454     return true;
 455
 456   // Try matching NAME without ".a" at the end.
 457   size_t length = strlen(basename);
 458   if ((length >= 2)
 459       && (basename[length - 2] == '.')
 460       && (basename[length - 1] == 'a'))
 461     {
 462       p = excluded_libs_.find(std::string(basename, length - 2));
 463       if (p != excluded_libs_.end())
 464         return true;
 465     }
 466
 467   return false;
 468 }
 469
 470 // Recognize input and output target names.  The GNU linker accepts
 471 // these with --format and --oformat.  This code is intended to be
 472 // minimally compatible.  In practice for an ELF target this would be
 473 // the same target as the input files; that name always start with
 474 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 475 // "binary", "ihex".
 476
 477 General_options::Object_format
 478 General_options::string_to_object_format(const char* arg)
 479 {
 480   if (strncmp(arg, "elf", 3) == 0)
 481     return gold::General_options::OBJECT_FORMAT_ELF;
 482   else if (strcmp(arg, "binary") == 0)
 483     return gold::General_options::OBJECT_FORMAT_BINARY;
 484   else
 485     {
 486       gold::gold_error(_("format '%s' not supported; treating as elf "
 487                          "(supported formats: elf, binary)"),
 488                        arg);
 489       return gold::General_options::OBJECT_FORMAT_ELF;
 490     }
 491 }
 492
 493 } // End namespace gold.
 494
 495 namespace
 496 {
 497
 498 void
 499 usage()
 500 {
 501   fprintf(stderr,
 502           _("%s: use the --help option for usage information\n"),
 503           gold::program_name);
 504   ::exit(EXIT_FAILURE);
 505 }
 506
 507 void
 508 usage(const char* msg, const char *opt)
 509 {
 510   fprintf(stderr,
 511           _("%s: %s: %s\n"),
 512           gold::program_name, opt, msg);
 513   usage();
 514 }
 515
 516 // If the default sysroot is relocatable, try relocating it based on
 517 // the prefix FROM.
 518
 519 static char*
 520 get_relative_sysroot(const char* from)
 521 {
 522   char* path = make_relative_prefix(gold::program_name, from,
 523                                     TARGET_SYSTEM_ROOT);
 524   if (path != NULL)
 525     {
 526       struct stat s;
 527       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 528         return path;
 529       free(path);
 530     }
 531
 532   return NULL;
 533 }
 534
 535 // Return the default sysroot.  This is set by the --with-sysroot
 536 // option to configure.  Note we do not free the return value of
 537 // get_relative_sysroot, which is a small memory leak, but is
 538 // necessary since we store this pointer directly in General_options.
 539
 540 static const char*
 541 get_default_sysroot()
 542 {
 543   const char* sysroot = TARGET_SYSTEM_ROOT;
 544   if (*sysroot == '\0')
 545     return NULL;
 546
 547   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 548     {
 549       char* path = get_relative_sysroot(BINDIR);
 550       if (path == NULL)
 551         path = get_relative_sysroot(TOOLBINDIR);
 552       if (path != NULL)
 553         return path;
 554     }
 555
 556   return sysroot;
 557 }
 558
 559 // Parse a long option.  Such options have the form
 560 // <-|--><option>[=arg].  If "=arg" is not present but the option
 561 // takes an argument, the next word is taken to the be the argument.
 562 // If equals_only is set, then only the <option>=<arg> form is
 563 // accepted, not the <option><space><arg> form.  Returns a One_option
 564 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 565 // the not-NULL case, *arg is set to the option's argument (NULL if
 566 // the option takes no argument), and *i is advanced past this option.
 567 // NOTE: it is safe for argv and arg to point to the same place.
 568 gold::options::One_option*
 569 parse_long_option(int argc, const char** argv, bool equals_only,
 570                   const char** arg, int* i)
 571 {
 572   const char* const this_argv = argv[*i];
 573
 574   const char* equals = strchr(this_argv, '=');
 575   const char* option_start = this_argv + strspn(this_argv, "-");
 576   std::string option(option_start,
 577                      equals ? equals - option_start : strlen(option_start));
 578
 579   gold::options::Option_map::iterator it
 580       = gold::options::long_options->find(option);
 581   if (it == gold::options::long_options->end())
 582     return NULL;
 583
 584   gold::options::One_option* retval = it->second;
 585
 586   // If the dash-count doesn't match, we fail.
 587   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 588     {
 589       if (retval->dashes != gold::options::DASH_Z)
 590         return NULL;
 591     }
 592   else if (this_argv[1] != '-')   // one dash
 593     {
 594       if (retval->dashes != gold::options::ONE_DASH
 595           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 596           && retval->dashes != gold::options::TWO_DASHES)
 597         return NULL;
 598     }
 599   else                            // two dashes (or more!)
 600     {
 601       if (retval->dashes != gold::options::TWO_DASHES
 602           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 603           && retval->dashes != gold::options::ONE_DASH)
 604         return NULL;
 605     }
 606
 607   // Now that we know the option is good (or else bad in a way that
 608   // will cause us to die), increment i to point past this argv.
 609   ++(*i);
 610
 611   // Figure out the option's argument, if any.
 612   if (!retval->takes_argument())
 613     {
 614       if (equals)
 615         usage(_("unexpected argument"), this_argv);
 616       else
 617         *arg = NULL;
 618     }
 619   else
 620     {
 621       if (equals)
 622         *arg = equals + 1;
 623       else if (retval->takes_optional_argument())
 624         *arg = retval->default_value;
 625       else if (*i < argc && !equals_only)
 626         *arg = argv[(*i)++];
 627       else
 628         usage(_("missing argument"), this_argv);
 629     }
 630
 631   return retval;
 632 }
 633
 634 // Parse a short option.  Such options have the form -<option>[arg].
 635 // If "arg" is not present but the option takes an argument, the next
 636 // word is taken to the be the argument.  If the option does not take
 637 // an argument, it may be followed by another short option.  Returns a
 638 // One_option struct or NULL if argv[i] cannot be parsed as a short
 639 // option.  In the not-NULL case, *arg is set to the option's argument
 640 // (NULL if the option takes no argument), and *i is advanced past
 641 // this option.  This function keeps *i the same if we parsed a short
 642 // option that does not take an argument, that looks to be followed by
 643 // another short option in the same word.
 644 gold::options::One_option*
 645 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 646                    const char** arg, int* i)
 647 {
 648   const char* const this_argv = argv[*i];
 649
 650   if (this_argv[0] != '-')
 651     return NULL;
 652
 653   // We handle -z as a special case.
 654   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 655                                           'z', "", NULL, "Z-OPTION", false,
 656                                           NULL);
 657   gold::options::One_option* retval = NULL;
 658   if (this_argv[pos_in_argv_i] == 'z')
 659     retval = &dash_z;
 660   else
 661     {
 662       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 663       if (char_as_int > 0 && char_as_int < 128)
 664         retval = gold::options::short_options[char_as_int];
 665     }
 666
 667   if (retval == NULL)
 668     return NULL;
 669
 670   // Figure out the option's argument, if any.
 671   if (!retval->takes_argument())
 672     {
 673       *arg = NULL;
 674       // We only advance past this argument if it's the only one in argv.
 675       if (this_argv[pos_in_argv_i + 1] == '\0')
 676         ++(*i);
 677     }
 678   else
 679     {
 680       // If we take an argument, we'll eat up this entire argv entry.
 681       ++(*i);
 682       if (this_argv[pos_in_argv_i + 1] != '\0')
 683         *arg = this_argv + pos_in_argv_i + 1;
 684       else if (retval->takes_optional_argument())
 685         *arg = retval->default_value;
 686       else if (*i < argc)
 687         *arg = argv[(*i)++];
 688       else
 689         usage(_("missing argument"), this_argv);
 690     }
 691
 692   // If we're a -z option, we need to parse our argument as a
 693   // long-option, e.g. "-z stacksize=8192".
 694   if (retval == &dash_z)
 695     {
 696       int dummy_i = 0;
 697       const char* dash_z_arg = *arg;
 698       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 699       if (retval == NULL)
 700         usage(_("unknown -z option"), dash_z_arg);
 701     }
 702
 703   return retval;
 704 }
 705
 706 } // End anonymous namespace.
 707
 708 namespace gold
 709 {
 710
 711 General_options::General_options()
 712   : printed_version_(false),
 713     execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 714     do_demangle_(false), plugins_(),
 715     incremental_disposition_(INCREMENTAL_CHECK), implicit_incremental_(false)
 716 {
 717 }
 718
 719 General_options::Object_format
 720 General_options::format_enum() const
 721 {
 722   return General_options::string_to_object_format(this->format());
 723 }
 724
 725 General_options::Object_format
 726 General_options::oformat_enum() const
 727 {
 728   return General_options::string_to_object_format(this->oformat());
 729 }
 730
 731 // Add the sysroot, if any, to the search paths.
 732
 733 void
 734 General_options::add_sysroot()
 735 {
 736   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 737     {
 738       this->set_sysroot(get_default_sysroot());
 739       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 740         return;
 741     }
 742
 743   char* canonical_sysroot = lrealpath(this->sysroot());
 744
 745   for (Dir_list::iterator p = this->library_path_.value.begin();
 746        p != this->library_path_.value.end();
 747        ++p)
 748     p->add_sysroot(this->sysroot(), canonical_sysroot);
 749
 750   free(canonical_sysroot);
 751 }
 752
 753 // Return whether FILENAME is in a system directory.
 754
 755 bool
 756 General_options::is_in_system_directory(const std::string& filename) const
 757 {
 758   for (Dir_list::const_iterator p = this->library_path_.value.begin();
 759        p != this->library_path_.value.end();
 760        ++p)
 761     {
 762       // We use a straight string comparison rather than calling
 763       // FILENAME_CMP because we are only interested in the cases
 764       // where we found the file in a system directory, which means
 765       // that we used the directory name as a prefix for a -L search.
 766       if (p->is_system_directory()
 767           && filename.compare(0, p->name().size(), p->name()) == 0)
 768         return true;
 769     }
 770   return false;
 771 }
 772
 773 // Add a plugin to the list of plugins.
 774
 775 void
 776 General_options::add_plugin(const char* filename)
 777 {
 778   if (this->plugins_ == NULL)
 779     this->plugins_ = new Plugin_manager(*this);
 780   this->plugins_->add_plugin(filename);
 781 }
 782
 783 // Add a plugin option to a plugin.
 784
 785 void
 786 General_options::add_plugin_option(const char* arg)
 787 {
 788   if (this->plugins_ == NULL)
 789     gold_fatal("--plugin-opt requires --plugin.");
 790   this->plugins_->add_plugin_option(arg);
 791 }
 792
 793 // Set up variables and other state that isn't set up automatically by
 794 // the parse routine, and ensure options don't contradict each other
 795 // and are otherwise kosher.
 796
 797 void
 798 General_options::finalize()
 799 {
 800   // Normalize the strip modifiers.  They have a total order:
 801   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
 802   // If one is true, set all beneath it to true as well.
 803   if (this->strip_all())
 804     this->set_strip_debug(true);
 805   if (this->strip_debug())
 806     this->set_strip_debug_non_line(true);
 807   if (this->strip_debug_non_line())
 808     this->set_strip_debug_gdb(true);
 809
 810   if (this->Bshareable())
 811     this->set_shared(true);
 812
 813   // If the user specifies both -s and -r, convert the -s to -S.
 814   // -r requires us to keep externally visible symbols!
 815   if (this->strip_all() && this->relocatable())
 816     {
 817       this->set_strip_all(false);
 818       gold_assert(this->strip_debug());
 819     }
 820
 821   // For us, -dc and -dp are synonyms for --define-common.
 822   if (this->dc())
 823     this->set_define_common(true);
 824   if (this->dp())
 825     this->set_define_common(true);
 826
 827   // We also set --define-common if we're not relocatable, as long as
 828   // the user didn't explicitly ask for something different.
 829   if (!this->user_set_define_common())
 830     this->set_define_common(!this->relocatable());
 831
 832   // execstack_status_ is a three-state variable; update it based on
 833   // -z [no]execstack.
 834   if (this->execstack())
 835     this->set_execstack_status(EXECSTACK_YES);
 836   else if (this->noexecstack())
 837     this->set_execstack_status(EXECSTACK_NO);
 838
 839   // Handle the optional argument for --demangle.
 840   if (this->user_set_demangle())
 841     {
 842       this->set_do_demangle(true);
 843       const char* style = this->demangle();
 844       if (*style != '\0')
 845         {
 846           enum demangling_styles style_code;
 847
 848           style_code = cplus_demangle_name_to_style(style);
 849           if (style_code == unknown_demangling)
 850             gold_fatal("unknown demangling style '%s'", style);
 851           cplus_demangle_set_style(style_code);
 852         }
 853     }
 854   else if (this->user_set_no_demangle())
 855     this->set_do_demangle(false);
 856   else
 857     {
 858       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 859       // behaviour identical to that of gcc's linker wrapper.
 860       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 861     }
 862
 863   // -M is equivalent to "-Map -".
 864   if (this->print_map() && !this->user_set_Map())
 865     {
 866       this->set_Map("-");
 867       this->set_user_set_Map();
 868     }
 869
 870   // Using -n or -N implies -static.
 871   if (this->nmagic() || this->omagic())
 872     this->set_static(true);
 873
 874   // If --thread_count is specified, it applies to
 875   // --thread-count-{initial,middle,final}, though it doesn't override
 876   // them.
 877   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 878     this->set_thread_count_initial(this->thread_count());
 879   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 880     this->set_thread_count_middle(this->thread_count());
 881   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 882     this->set_thread_count_final(this->thread_count());
 883
 884   // Let's warn if you set the thread-count but we're going to ignore it.
 885 #ifndef ENABLE_THREADS
 886   if (this->threads())
 887     {
 888       gold_warning(_("ignoring --threads: "
 889                      "%s was compiled without thread support"),
 890                    program_name);
 891       this->set_threads(false);
 892     }
 893   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 894       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 895     gold_warning(_("ignoring --thread-count: "
 896                    "%s was compiled without thread support"),
 897                  program_name);
 898 #endif
 899
 900   if (this->user_set_Y())
 901     {
 902       std::string s = this->Y();
 903       if (s.compare(0, 2, "P,") == 0)
 904         s.erase(0, 2);
 905
 906       size_t pos = 0;
 907       size_t next_pos;
 908       do
 909         {
 910           next_pos = s.find(':', pos);
 911           size_t len = (next_pos == std::string::npos
 912                         ? next_pos
 913                         : next_pos - pos);
 914           if (len != 0)
 915             this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
 916           pos = next_pos + 1;
 917         }
 918       while (next_pos != std::string::npos);
 919     }
 920   else
 921     {
 922       // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 923       // FIXME: We should only do this when configured in native mode.
 924       this->add_to_library_path_with_sysroot("/lib");
 925       this->add_to_library_path_with_sysroot("/usr/lib");
 926     }
 927
 928   if (this->shared() && !this->user_set_allow_shlib_undefined())
 929     this->set_allow_shlib_undefined(true);
 930
 931   // Normalize library_path() by adding the sysroot to all directories
 932   // in the path, as appropriate.
 933   this->add_sysroot();
 934
 935   // Now that we've normalized the options, check for contradictory ones.
 936   if (this->shared() && this->is_static())
 937     gold_fatal(_("-shared and -static are incompatible"));
 938
 939   if (this->shared() && this->relocatable())
 940     gold_fatal(_("-shared and -r are incompatible"));
 941
 942   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 943       && (this->shared() || this->relocatable()))
 944     gold_fatal(_("binary output format not compatible with -shared or -r"));
 945
 946   if (this->user_set_hash_bucket_empty_fraction()
 947       && (this->hash_bucket_empty_fraction() < 0.0
 948           || this->hash_bucket_empty_fraction() >= 1.0))
 949     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 950                  "[0.0, 1.0)"),
 951                this->hash_bucket_empty_fraction());
 952
 953   if (this->implicit_incremental_ && !this->incremental())
 954     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
 955                  "--incremental-unknown require the use of --incremental"));
 956
 957   // FIXME: we can/should be doing a lot more sanity checking here.
 958 }
 959
 960 // Search_directory methods.
 961
 962 // This is called if we have a sysroot.  Apply the sysroot if
 963 // appropriate.  Record whether the directory is in the sysroot.
 964
 965 void
 966 Search_directory::add_sysroot(const char* sysroot,
 967                               const char* canonical_sysroot)
 968 {
 969   gold_assert(*sysroot != '\0');
 970   if (this->put_in_sysroot_)
 971     {
 972       if (!IS_DIR_SEPARATOR(this->name_[0])
 973           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 974         this->name_ = '/' + this->name_;
 975       this->name_ = sysroot + this->name_;
 976       this->is_in_sysroot_ = true;
 977     }
 978   else
 979     {
 980       // Check whether this entry is in the sysroot.  To do this
 981       // correctly, we need to use canonical names.  Otherwise we will
 982       // get confused by the ../../.. paths that gcc tends to use.
 983       char* canonical_name = lrealpath(this->name_.c_str());
 984       int canonical_name_len = strlen(canonical_name);
 985       int canonical_sysroot_len = strlen(canonical_sysroot);
 986       if (canonical_name_len > canonical_sysroot_len
 987           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 988         {
 989           canonical_name[canonical_sysroot_len] = '\0';
 990           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 991             this->is_in_sysroot_ = true;
 992         }
 993       free(canonical_name);
 994     }
 995 }
 996
 997 // Input_arguments methods.
 998
 999 // Add a file to the list.
1000
1001 void
1002 Input_arguments::add_file(const Input_file_argument& file)
1003 {
1004   if (!this->in_group_)
1005     this->input_argument_list_.push_back(Input_argument(file));
1006   else
1007     {
1008       gold_assert(!this->input_argument_list_.empty());
1009       gold_assert(this->input_argument_list_.back().is_group());
1010       this->input_argument_list_.back().group()->add_file(file);
1011     }
1012 }
1013
1014 // Start a group.
1015
1016 void
1017 Input_arguments::start_group()
1018 {
1019   if (this->in_group_)
1020     gold_fatal(_("May not nest groups"));
1021   Input_file_group* group = new Input_file_group();
1022   this->input_argument_list_.push_back(Input_argument(group));
1023   this->in_group_ = true;
1024 }
1025
1026 // End a group.
1027
1028 void
1029 Input_arguments::end_group()
1030 {
1031   if (!this->in_group_)
1032     gold_fatal(_("Group end without group start"));
1033   this->in_group_ = false;
1034 }
1035
1036 // Command_line options.
1037
1038 Command_line::Command_line()
1039 {
1040 }
1041
1042 // Process the command line options.  For process_one_option, i is the
1043 // index of argv to process next, and must be an option (that is,
1044 // start with a dash).  The return value is the index of the next
1045 // option to process (i+1 or i+2, or argc to indicate processing is
1046 // done).  no_more_options is set to true if (and when) "--" is seen
1047 // as an option.
1048
1049 int
1050 Command_line::process_one_option(int argc, const char** argv, int i,
1051                                  bool* no_more_options)
1052 {
1053   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1054
1055   // If we are reading "--", then just set no_more_options and return.
1056   if (argv[i][1] == '-' && argv[i][2] == '\0')
1057     {
1058       *no_more_options = true;
1059       return i + 1;
1060     }
1061
1062   int new_i = i;
1063   options::One_option* option = NULL;
1064   const char* arg = NULL;
1065
1066   // First, try to process argv as a long option.
1067   option = parse_long_option(argc, argv, false, &arg, &new_i);
1068   if (option)
1069     {
1070       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1071       return new_i;
1072     }
1073
1074   // Now, try to process argv as a short option.  Since several short
1075   // options can be combined in one argv, we may have to parse a lot
1076   // until we're done reading this argv.
1077   int pos_in_argv_i = 1;
1078   while (new_i == i)
1079     {
1080       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1081       if (!option)
1082         break;
1083       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1084       ++pos_in_argv_i;
1085     }
1086   if (option)
1087     return new_i;
1088
1089   // I guess it's neither a long option nor a short option.
1090   usage(_("unknown option"), argv[i]);
1091   return argc;
1092 }
1093
1094
1095 void
1096 Command_line::process(int argc, const char** argv)
1097 {
1098   bool no_more_options = false;
1099   int i = 0;
1100   while (i < argc)
1101     {
1102       this->position_options_.copy_from_options(this->options());
1103       if (no_more_options || argv[i][0] != '-')
1104         {
1105           Input_file_argument file(argv[i], false, "", false,
1106                                    this->position_options_);
1107           this->inputs_.add_file(file);
1108           ++i;
1109         }
1110       else
1111         i = process_one_option(argc, argv, i, &no_more_options);
1112     }
1113
1114   if (this->inputs_.in_group())
1115     {
1116       fprintf(stderr, _("%s: missing group end\n"), program_name);
1117       usage();
1118     }
1119
1120   // Normalize the options and ensure they don't contradict each other.
1121   this->options_.finalize();
1122 }
1123
1124 } // End namespace gold.