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