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 <vector>
  27 #include <iostream>
  28 #include <sys/stat.h>
  29 #include "filenames.h"
  30 #include "libiberty.h"
  31 #include "demangle.h"
  32 #include "../bfd/bfdver.h"
  33
  34 #include "debug.h"
  35 #include "script.h"
  36 #include "target-select.h"
  37 #include "options.h"
  38
  39 namespace gold
  40 {
  41
  42 General_options
  43 Position_dependent_options::default_options_;
  44
  45 namespace options
  46 {
  47
  48 // This global variable is set up as General_options is constructed.
  49 static std::vector<const One_option*> registered_options;
  50
  51 // These are set up at the same time -- the variables that accept one
  52 // dash, two, or require -z.  A single variable may be in more than
  53 // one of thes data structures.
  54 typedef Unordered_map<std::string, One_option*> Option_map;
  55 static Option_map* long_options = NULL;
  56 static One_option* short_options[128];
  57
  58 void
  59 One_option::register_option()
  60 {
  61   registered_options.push_back(this);
  62
  63   // We can't make long_options a static Option_map because we can't
  64   // guarantee that will be initialized before register_option() is
  65   // first called.
  66   if (long_options == NULL)
  67     long_options = new Option_map;
  68
  69   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  70   if (!this->longname.empty())
  71     (*long_options)[this->longname] = this;
  72
  73   const int shortname_as_int = static_cast<int>(this->shortname);
  74   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  75   if (this->shortname != '\0')
  76     short_options[shortname_as_int] = this;
  77 }
  78
  79 void
  80 One_option::print() const
  81 {
  82   bool comma = false;
  83   printf("  ");
  84   int len = 2;
  85   if (this->shortname != '\0')
  86     {
  87       len += printf("-%c", this->shortname);
  88       if (this->helparg)
  89         {
  90           // -z takes long-names only.
  91           gold_assert(this->dashes != DASH_Z);
  92           len += printf(" %s", gettext(this->helparg));
  93         }
  94       comma = true;
  95     }
  96   if (!this->longname.empty()
  97       && !(this->longname[0] == this->shortname
  98            && this->longname[1] == '\0'))
  99     {
 100       if (comma)
 101         len += printf(", ");
 102       switch (this->dashes)
 103         {
 104         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 105           len += printf("-");
 106           break;
 107         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 108           len += printf("--");
 109           break;
 110         case options::DASH_Z:
 111           len += printf("-z ");
 112           break;
 113         default:
 114           gold_unreachable();
 115         }
 116       len += printf("%s", this->longname.c_str());
 117       if (this->helparg)
 118         {
 119           // For most options, we print "--frob FOO".  But for -z
 120           // we print "-z frob=FOO".
 121           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 122                         gettext(this->helparg));
 123         }
 124     }
 125
 126   if (len >= 30)
 127     {
 128       printf("\n");
 129       len = 0;
 130     }
 131   for (; len < 30; ++len)
 132     std::putchar(' ');
 133
 134   // TODO: if we're boolean, add " (default)" when appropriate.
 135   printf("%s\n", gettext(this->helpstring));
 136 }
 137
 138 void
 139 help()
 140 {
 141   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 142
 143   std::vector<const One_option*>::const_iterator it;
 144   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 145     (*it)->print();
 146
 147   // config.guess and libtool.m4 look in ld --help output for the
 148   // string "supported targets".
 149   printf(_("%s: supported targets:"), gold::program_name);
 150   std::vector<const char*> supported_names;
 151   gold::supported_target_names(&supported_names);
 152   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 153        p != supported_names.end();
 154        ++p)
 155     printf(" %s", *p);
 156   printf("\n");
 157
 158   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
 159   const char* report = REPORT_BUGS_TO;
 160   if (*report != '\0')
 161     printf(_("Report bugs to %s\n"), report);
 162 }
 163
 164 // For bool, arg will be NULL (boolean options take no argument);
 165 // we always just set to true.
 166 void
 167 parse_bool(const char*, const char*, bool* retval)
 168 {
 169   *retval = true;
 170 }
 171
 172 void
 173 parse_uint(const char* option_name, const char* arg, int* retval)
 174 {
 175   char* endptr;
 176   *retval = strtol(arg, &endptr, 0);
 177   if (*endptr != '\0' || retval < 0)
 178     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 179                option_name, arg);
 180 }
 181
 182 void
 183 parse_uint64(const char* option_name, const char* arg, uint64_t *retval)
 184 {
 185   char* endptr;
 186   *retval = strtoull(arg, &endptr, 0);
 187   if (*endptr != '\0')
 188     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 189                option_name, arg);
 190 }
 191
 192 void
 193 parse_double(const char* option_name, const char* arg, double* retval)
 194 {
 195   char* endptr;
 196   *retval = strtod(arg, &endptr);
 197   if (*endptr != '\0')
 198     gold_fatal(_("%s: invalid option value "
 199                  "(expected a floating point number): %s"),
 200                option_name, arg);
 201 }
 202
 203 void
 204 parse_string(const char* option_name, const char* arg, const char** retval)
 205 {
 206   if (*arg == '\0')
 207     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 208   *retval = arg;
 209 }
 210
 211 void
 212 parse_optional_string(const char*, const char* arg, const char** retval)
 213 {
 214   *retval = arg;
 215 }
 216
 217 void
 218 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 219 {
 220   retval->push_back(Search_directory(arg, false));
 221 }
 222
 223 void
 224 parse_choices(const char* option_name, const char* arg, const char** retval,
 225               const char* choices[], int num_choices)
 226 {
 227   for (int i = 0; i < num_choices; i++)
 228     if (strcmp(choices[i], arg) == 0)
 229       {
 230         *retval = arg;
 231         return;
 232       }
 233
 234   // If we get here, the user did not enter a valid choice, so we die.
 235   std::string choices_list;
 236   for (int i = 0; i < num_choices; i++)
 237     {
 238       choices_list += choices[i];
 239       if (i != num_choices - 1)
 240         choices_list += ", ";
 241     }
 242   gold_fatal(_("%s: must take one of the following arguments: %s"),
 243              option_name, choices_list.c_str());
 244 }
 245
 246 } // End namespace options.
 247
 248 // Define the handler for "special" options (set via DEFINE_special).
 249
 250 void
 251 General_options::parse_help(const char*, const char*, Command_line*)
 252 {
 253   options::help();
 254   ::exit(EXIT_SUCCESS);
 255 }
 256
 257 void
 258 General_options::parse_version(const char* opt, const char*, Command_line*)
 259 {
 260   gold::print_version(opt[0] == '-' && opt[1] == 'v');
 261   ::exit(EXIT_SUCCESS);
 262 }
 263
 264 void
 265 General_options::parse_Bstatic(const char*, const char*, Command_line*)
 266 {
 267   this->set_Bdynamic(false);
 268 }
 269
 270 void
 271 General_options::parse_defsym(const char*, const char* arg,
 272                               Command_line* cmdline)
 273 {
 274   cmdline->script_options().define_symbol(arg);
 275 }
 276
 277 void
 278 General_options::parse_library(const char*, const char* arg,
 279                                Command_line* cmdline)
 280 {
 281   Input_file_argument file(arg, true, "", false, *this);
 282   cmdline->inputs().add_file(file);
 283 }
 284
 285 void
 286 General_options::parse_R(const char* option, const char* arg,
 287                          Command_line* cmdline)
 288 {
 289   struct stat s;
 290   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 291     this->add_to_rpath(arg);
 292   else
 293     this->parse_just_symbols(option, arg, cmdline);
 294 }
 295
 296 void
 297 General_options::parse_just_symbols(const char*, const char* arg,
 298                                     Command_line* cmdline)
 299 {
 300   Input_file_argument file(arg, false, "", true, *this);
 301   cmdline->inputs().add_file(file);
 302 }
 303
 304 void
 305 General_options::parse_static(const char*, const char*, Command_line*)
 306 {
 307   this->set_static(true);
 308 }
 309
 310 void
 311 General_options::parse_script(const char*, const char* arg,
 312                               Command_line* cmdline)
 313 {
 314   if (!read_commandline_script(arg, cmdline))
 315     gold::gold_fatal(_("unable to parse script file %s"), arg);
 316 }
 317
 318 void
 319 General_options::parse_version_script(const char*, const char* arg,
 320                                       Command_line* cmdline)
 321 {
 322   if (!read_version_script(arg, cmdline))
 323     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 324 }
 325
 326 void
 327 General_options::parse_start_group(const char*, const char*,
 328                                    Command_line* cmdline)
 329 {
 330   cmdline->inputs().start_group();
 331 }
 332
 333 void
 334 General_options::parse_end_group(const char*, const char*,
 335                                  Command_line* cmdline)
 336 {
 337   cmdline->inputs().end_group();
 338 }
 339
 340 } // End namespace gold.
 341
 342 namespace
 343 {
 344
 345 void
 346 usage()
 347 {
 348   fprintf(stderr,
 349           _("%s: use the --help option for usage information\n"),
 350           gold::program_name);
 351   ::exit(EXIT_FAILURE);
 352 }
 353
 354 void
 355 usage(const char* msg, const char *opt)
 356 {
 357   fprintf(stderr,
 358           _("%s: %s: %s\n"),
 359           gold::program_name, opt, msg);
 360   usage();
 361 }
 362
 363 // Recognize input and output target names.  The GNU linker accepts
 364 // these with --format and --oformat.  This code is intended to be
 365 // minimally compatible.  In practice for an ELF target this would be
 366 // the same target as the input files; that name always start with
 367 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 368 // "binary", "ihex".
 369
 370 gold::General_options::Object_format
 371 string_to_object_format(const char* arg)
 372 {
 373   if (strncmp(arg, "elf", 3) == 0)
 374     return gold::General_options::OBJECT_FORMAT_ELF;
 375   else if (strcmp(arg, "binary") == 0)
 376     return gold::General_options::OBJECT_FORMAT_BINARY;
 377   else
 378     {
 379       gold::gold_error(_("format '%s' not supported; treating as elf "
 380                          "(supported formats: elf, binary)"),
 381                        arg);
 382       return gold::General_options::OBJECT_FORMAT_ELF;
 383     }
 384 }
 385
 386 // If the default sysroot is relocatable, try relocating it based on
 387 // the prefix FROM.
 388
 389 char*
 390 get_relative_sysroot(const char* from)
 391 {
 392   char* path = make_relative_prefix(gold::program_name, from,
 393                                     TARGET_SYSTEM_ROOT);
 394   if (path != NULL)
 395     {
 396       struct stat s;
 397       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 398         return path;
 399       free(path);
 400     }
 401
 402   return NULL;
 403 }
 404
 405 // Return the default sysroot.  This is set by the --with-sysroot
 406 // option to configure.  Note we do not free the return value of
 407 // get_relative_sysroot, which is a small memory leak, but is
 408 // necessary since we store this pointer directly in General_options.
 409
 410 const char*
 411 get_default_sysroot()
 412 {
 413   const char* sysroot = TARGET_SYSTEM_ROOT;
 414   if (*sysroot == '\0')
 415     return NULL;
 416
 417   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 418     {
 419       char* path = get_relative_sysroot(BINDIR);
 420       if (path == NULL)
 421         path = get_relative_sysroot(TOOLBINDIR);
 422       if (path != NULL)
 423         return path;
 424     }
 425
 426   return sysroot;
 427 }
 428
 429 // Parse a long option.  Such options have the form
 430 // <-|--><option>[=arg].  If "=arg" is not present but the option
 431 // takes an argument, the next word is taken to the be the argument.
 432 // If equals_only is set, then only the <option>=<arg> form is
 433 // accepted, not the <option><space><arg> form.  Returns a One_option
 434 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 435 // the not-NULL case, *arg is set to the option's argument (NULL if
 436 // the option takes no argument), and *i is advanced past this option.
 437 // NOTE: it is safe for argv and arg to point to the same place.
 438 gold::options::One_option*
 439 parse_long_option(int argc, const char** argv, bool equals_only,
 440                   const char** arg, int* i)
 441 {
 442   const char* const this_argv = argv[*i];
 443
 444   const char* equals = strchr(this_argv, '=');
 445   const char* option_start = this_argv + strspn(this_argv, "-");
 446   std::string option(option_start,
 447                      equals ? equals - option_start : strlen(option_start));
 448
 449   gold::options::Option_map::iterator it
 450       = gold::options::long_options->find(option);
 451   if (it == gold::options::long_options->end())
 452     return NULL;
 453
 454   gold::options::One_option* retval = it->second;
 455
 456   // If the dash-count doesn't match, we fail.
 457   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 458     {
 459       if (retval->dashes != gold::options::DASH_Z)
 460         return NULL;
 461     }
 462   else if (this_argv[1] != '-')   // one dash
 463     {
 464       if (retval->dashes != gold::options::ONE_DASH
 465           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 466           && retval->dashes != gold::options::TWO_DASHES)
 467         return NULL;
 468     }
 469   else                            // two dashes (or more!)
 470     {
 471       if (retval->dashes != gold::options::TWO_DASHES
 472           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 473           && retval->dashes != gold::options::ONE_DASH)
 474         return NULL;
 475     }
 476
 477   // Now that we know the option is good (or else bad in a way that
 478   // will cause us to die), increment i to point past this argv.
 479   ++(*i);
 480
 481   // Figure out the option's argument, if any.
 482   if (!retval->takes_argument())
 483     {
 484       if (equals)
 485         usage(_("unexpected argument"), this_argv);
 486       else
 487         *arg = NULL;
 488     }
 489   else
 490     {
 491       if (equals)
 492         *arg = equals + 1;
 493       else if (retval->takes_optional_argument())
 494         *arg = retval->default_value;
 495       else if (*i < argc && !equals_only)
 496         *arg = argv[(*i)++];
 497       else
 498         usage(_("missing argument"), this_argv);
 499     }
 500
 501   return retval;
 502 }
 503
 504 // Parse a short option.  Such options have the form -<option>[arg].
 505 // If "arg" is not present but the option takes an argument, the next
 506 // word is taken to the be the argument.  If the option does not take
 507 // an argument, it may be followed by another short option.  Returns a
 508 // One_option struct or NULL if argv[i] cannot be parsed as a short
 509 // option.  In the not-NULL case, *arg is set to the option's argument
 510 // (NULL if the option takes no argument), and *i is advanced past
 511 // this option.  This function keeps *i the same if we parsed a short
 512 // option that does not take an argument, that looks to be followed by
 513 // another short option in the same word.
 514 gold::options::One_option*
 515 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 516                    const char** arg, int* i)
 517 {
 518   const char* const this_argv = argv[*i];
 519
 520   if (this_argv[0] != '-')
 521     return NULL;
 522
 523   // We handle -z as a special case.
 524   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 525                                           'z', "", "-z", "Z-OPTION", false,
 526                                           NULL);
 527   gold::options::One_option* retval = NULL;
 528   if (this_argv[pos_in_argv_i] == 'z')
 529     retval = &dash_z;
 530   else
 531     {
 532       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 533       if (char_as_int > 0 && char_as_int < 128)
 534         retval = gold::options::short_options[char_as_int];
 535     }
 536
 537   if (retval == NULL)
 538     return NULL;
 539
 540   // Figure out the option's argument, if any.
 541   if (!retval->takes_argument())
 542     {
 543       *arg = NULL;
 544       // We only advance past this argument if it's the only one in argv.
 545       if (this_argv[pos_in_argv_i + 1] == '\0')
 546         ++(*i);
 547     }
 548   else
 549     {
 550       // If we take an argument, we'll eat up this entire argv entry.
 551       ++(*i);
 552       if (this_argv[pos_in_argv_i + 1] != '\0')
 553         *arg = this_argv + pos_in_argv_i + 1;
 554       else if (retval->takes_optional_argument())
 555         *arg = retval->default_value;
 556       else if (*i < argc)
 557         *arg = argv[(*i)++];
 558       else
 559         usage(_("missing argument"), this_argv);
 560     }
 561
 562   // If we're a -z option, we need to parse our argument as a
 563   // long-option, e.g. "-z stacksize=8192".
 564   if (retval == &dash_z)
 565     {
 566       int dummy_i = 0;
 567       const char* dash_z_arg = *arg;
 568       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 569       if (retval == NULL)
 570         usage(_("unknown -z option"), dash_z_arg);
 571     }
 572
 573   return retval;
 574 }
 575
 576 } // End anonymous namespace.
 577
 578 namespace gold
 579 {
 580
 581 General_options::General_options()
 582   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 583     do_demangle_(false)
 584 {
 585 }
 586
 587 General_options::Object_format
 588 General_options::format_enum() const
 589 {
 590   return string_to_object_format(this->format());
 591 }
 592
 593 General_options::Object_format
 594 General_options::oformat_enum() const
 595 {
 596   return string_to_object_format(this->oformat());
 597 }
 598
 599 // Add the sysroot, if any, to the search paths.
 600
 601 void
 602 General_options::add_sysroot()
 603 {
 604   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 605     {
 606       this->set_sysroot(get_default_sysroot());
 607       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 608         return;
 609     }
 610
 611   char* canonical_sysroot = lrealpath(this->sysroot());
 612
 613   for (Dir_list::iterator p = this->library_path_.value.begin();
 614        p != this->library_path_.value.end();
 615        ++p)
 616     p->add_sysroot(this->sysroot(), canonical_sysroot);
 617
 618   free(canonical_sysroot);
 619 }
 620
 621 // Set up variables and other state that isn't set up automatically by
 622 // the parse routine, and ensure options don't contradict each other
 623 // and are otherwise kosher.
 624
 625 void
 626 General_options::finalize()
 627 {
 628   // Normalize the strip modifiers.  They have a total order:
 629   // strip_all > strip_debug > strip_debug_gdb.  If one is true, set
 630   // all beneath it to true as well.
 631   if (this->strip_all())
 632     this->set_strip_debug(true);
 633   if (this->strip_debug())
 634     this->set_strip_debug_gdb(true);
 635
 636   // If the user specifies both -s and -r, convert the -s to -S.
 637   // -r requires us to keep externally visible symbols!
 638   if (this->strip_all() && this->relocatable())
 639     {
 640       this->set_strip_all(false);
 641       gold_assert(this->strip_debug());
 642     }
 643
 644   // For us, -dc and -dp are synonyms for --define-common.
 645   if (this->dc())
 646     this->set_define_common(true);
 647   if (this->dp())
 648     this->set_define_common(true);
 649
 650   // We also set --define-common if we're not relocatable, as long as
 651   // the user didn't explicitly ask for something different.
 652   if (!this->user_set_define_common())
 653     this->set_define_common(!this->relocatable());
 654
 655   // execstack_status_ is a three-state variable; update it based on
 656   // -z [no]execstack.
 657   if (this->execstack())
 658     this->set_execstack_status(EXECSTACK_YES);
 659   else if (this->noexecstack())
 660     this->set_execstack_status(EXECSTACK_NO);
 661
 662   // Handle the optional argument for --demangle.
 663   if (this->user_set_demangle())
 664     {
 665       this->set_do_demangle(true);
 666       const char* style = this->demangle();
 667       if (*style != '\0')
 668         {
 669           enum demangling_styles style_code;
 670
 671           style_code = cplus_demangle_name_to_style(style);
 672           if (style_code == unknown_demangling)
 673             gold_fatal("unknown demangling style '%s'", style);
 674           cplus_demangle_set_style(style_code);
 675         }
 676     }
 677   else if (this->user_set_no_demangle())
 678     this->set_do_demangle(false);
 679   else
 680     {
 681       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 682       // behaviour identical to that of gcc's linker wrapper.
 683       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 684     }
 685
 686   // If --thread_count is specified, it applies to
 687   // --thread-count-{initial,middle,final}, though it doesn't override
 688   // them.
 689   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 690     this->set_thread_count_initial(this->thread_count());
 691   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 692     this->set_thread_count_middle(this->thread_count());
 693   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 694     this->set_thread_count_final(this->thread_count());
 695
 696   // Let's warn if you set the thread-count but we're going to ignore it.
 697 #ifndef ENABLE_THREADS
 698   if (this->threads())
 699     {
 700       gold_warning(_("ignoring --threads: "
 701                      "%s was compiled without thread support"),
 702                    program_name);
 703       this->set_threads(false);
 704     }
 705   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 706       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 707     gold_warning(_("ignoring --thread-count: "
 708                    "%s was compiled without thread support"),
 709                  program_name);
 710 #endif
 711
 712   // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 713   // FIXME: We should only do this when configured in native mode.
 714   this->add_to_library_path_with_sysroot("/lib");
 715   this->add_to_library_path_with_sysroot("/usr/lib");
 716
 717   // Normalize library_path() by adding the sysroot to all directories
 718   // in the path, as appropriate.
 719   this->add_sysroot();
 720
 721   // Now that we've normalized the options, check for contradictory ones.
 722   if (this->shared() && this->relocatable())
 723     gold_fatal(_("-shared and -r are incompatible"));
 724
 725   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 726       && (this->shared() || this->relocatable()))
 727     gold_fatal(_("binary output format not compatible with -shared or -r"));
 728
 729   if (this->user_set_hash_bucket_empty_fraction()
 730       && (this->hash_bucket_empty_fraction() < 0.0
 731           || this->hash_bucket_empty_fraction() >= 1.0))
 732     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 733                  "[0.0, 1.0)"),
 734                this->hash_bucket_empty_fraction());
 735
 736   // FIXME: we can/should be doing a lot more sanity checking here.
 737 }
 738
 739 // Search_directory methods.
 740
 741 // This is called if we have a sysroot.  Apply the sysroot if
 742 // appropriate.  Record whether the directory is in the sysroot.
 743
 744 void
 745 Search_directory::add_sysroot(const char* sysroot,
 746                               const char* canonical_sysroot)
 747 {
 748   gold_assert(*sysroot != '\0');
 749   if (this->put_in_sysroot_)
 750     {
 751       if (!IS_DIR_SEPARATOR(this->name_[0])
 752           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 753         this->name_ = '/' + this->name_;
 754       this->name_ = sysroot + this->name_;
 755       this->is_in_sysroot_ = true;
 756     }
 757   else
 758     {
 759       // Check whether this entry is in the sysroot.  To do this
 760       // correctly, we need to use canonical names.  Otherwise we will
 761       // get confused by the ../../.. paths that gcc tends to use.
 762       char* canonical_name = lrealpath(this->name_.c_str());
 763       int canonical_name_len = strlen(canonical_name);
 764       int canonical_sysroot_len = strlen(canonical_sysroot);
 765       if (canonical_name_len > canonical_sysroot_len
 766           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 767         {
 768           canonical_name[canonical_sysroot_len] = '\0';
 769           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 770             this->is_in_sysroot_ = true;
 771         }
 772       free(canonical_name);
 773     }
 774 }
 775
 776 // Input_arguments methods.
 777
 778 // Add a file to the list.
 779
 780 void
 781 Input_arguments::add_file(const Input_file_argument& file)
 782 {
 783   if (!this->in_group_)
 784     this->input_argument_list_.push_back(Input_argument(file));
 785   else
 786     {
 787       gold_assert(!this->input_argument_list_.empty());
 788       gold_assert(this->input_argument_list_.back().is_group());
 789       this->input_argument_list_.back().group()->add_file(file);
 790     }
 791 }
 792
 793 // Start a group.
 794
 795 void
 796 Input_arguments::start_group()
 797 {
 798   if (this->in_group_)
 799     gold_fatal(_("May not nest groups"));
 800   Input_file_group* group = new Input_file_group();
 801   this->input_argument_list_.push_back(Input_argument(group));
 802   this->in_group_ = true;
 803 }
 804
 805 // End a group.
 806
 807 void
 808 Input_arguments::end_group()
 809 {
 810   if (!this->in_group_)
 811     gold_fatal(_("Group end without group start"));
 812   this->in_group_ = false;
 813 }
 814
 815 // Command_line options.
 816
 817 Command_line::Command_line()
 818 {
 819 }
 820
 821 // Process the command line options.  For process_one_option, i is the
 822 // index of argv to process next, and must be an option (that is,
 823 // start with a dash).  The return value is the index of the next
 824 // option to process (i+1 or i+2, or argc to indicate processing is
 825 // done).  no_more_options is set to true if (and when) "--" is seen
 826 // as an option.
 827
 828 int
 829 Command_line::process_one_option(int argc, const char** argv, int i,
 830                                  bool* no_more_options)
 831 {
 832   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 833
 834   // If we are reading "--", then just set no_more_options and return.
 835   if (argv[i][1] == '-' && argv[i][2] == '\0')
 836     {
 837       *no_more_options = true;
 838       return i + 1;
 839     }
 840
 841   int new_i = i;
 842   options::One_option* option = NULL;
 843   const char* arg = NULL;
 844
 845   // First, try to process argv as a long option.
 846   option = parse_long_option(argc, argv, false, &arg, &new_i);
 847   if (option)
 848     {
 849       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 850       return new_i;
 851     }
 852
 853   // Now, try to process argv as a short option.  Since several short
 854   // options can be combined in one argv, we may have to parse a lot
 855   // until we're done reading this argv.
 856   int pos_in_argv_i = 1;
 857   while (new_i == i)
 858     {
 859       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 860       if (!option)
 861         break;
 862       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 863       ++pos_in_argv_i;
 864     }
 865   if (option)
 866     return new_i;
 867
 868   // I guess it's neither a long option nor a short option.
 869   usage(_("unknown option"), argv[i]);
 870   return argc;
 871 }
 872
 873
 874 void
 875 Command_line::process(int argc, const char** argv)
 876 {
 877   bool no_more_options = false;
 878   int i = 0;
 879   while (i < argc)
 880     {
 881       this->position_options_.copy_from_options(this->options());
 882       if (no_more_options || argv[i][0] != '-')
 883         {
 884           Input_file_argument file(argv[i], false, "", false,
 885                                    this->position_options_);
 886           this->inputs_.add_file(file);
 887           ++i;
 888         }
 889       else
 890         i = process_one_option(argc, argv, i, &no_more_options);
 891     }
 892
 893   if (this->inputs_.in_group())
 894     {
 895       fprintf(stderr, _("%s: missing group end\n"), program_name);
 896       usage();
 897     }
 898
 899   // Normalize the options and ensure they don't contradict each other.
 900   this->options_.finalize();
 901 }
 902
 903 } // End namespace gold.