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