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