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