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_set(const char*, const char* arg, String_set* retval)
 226 {
 227   retval->insert(std::string(arg));
 228 }
 229
 230 void
 231 parse_choices(const char* option_name, const char* arg, const char** retval,
 232               const char* choices[], int num_choices)
 233 {
 234   for (int i = 0; i < num_choices; i++)
 235     if (strcmp(choices[i], arg) == 0)
 236       {
 237         *retval = arg;
 238         return;
 239       }
 240
 241   // If we get here, the user did not enter a valid choice, so we die.
 242   std::string choices_list;
 243   for (int i = 0; i < num_choices; i++)
 244     {
 245       choices_list += choices[i];
 246       if (i != num_choices - 1)
 247         choices_list += ", ";
 248     }
 249   gold_fatal(_("%s: must take one of the following arguments: %s"),
 250              option_name, choices_list.c_str());
 251 }
 252
 253 } // End namespace options.
 254
 255 // Define the handler for "special" options (set via DEFINE_special).
 256
 257 void
 258 General_options::parse_help(const char*, const char*, Command_line*)
 259 {
 260   options::help();
 261   ::exit(EXIT_SUCCESS);
 262 }
 263
 264 void
 265 General_options::parse_version(const char* opt, const char*, Command_line*)
 266 {
 267   gold::print_version(opt[0] == '-' && opt[1] == 'v');
 268   ::exit(EXIT_SUCCESS);
 269 }
 270
 271 void
 272 General_options::parse_V(const char*, const char*, Command_line*)
 273 {
 274   gold::print_version(true);
 275   printf(_("  Supported targets:\n"));
 276   std::vector<const char*> supported_names;
 277   gold::supported_target_names(&supported_names);
 278   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 279        p != supported_names.end();
 280        ++p)
 281     printf("   %s\n", *p);
 282 }
 283
 284 void
 285 General_options::parse_Bstatic(const char*, const char*, Command_line*)
 286 {
 287   this->set_Bdynamic(false);
 288 }
 289
 290 void
 291 General_options::parse_defsym(const char*, const char* arg,
 292                               Command_line* cmdline)
 293 {
 294   cmdline->script_options().define_symbol(arg);
 295 }
 296
 297 void
 298 General_options::parse_library(const char*, const char* arg,
 299                                Command_line* cmdline)
 300 {
 301   Input_file_argument file(arg, true, "", false, *this);
 302   cmdline->inputs().add_file(file);
 303 }
 304
 305 void
 306 General_options::parse_R(const char* option, const char* arg,
 307                          Command_line* cmdline)
 308 {
 309   struct stat s;
 310   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 311     this->add_to_rpath(arg);
 312   else
 313     this->parse_just_symbols(option, arg, cmdline);
 314 }
 315
 316 void
 317 General_options::parse_just_symbols(const char*, const char* arg,
 318                                     Command_line* cmdline)
 319 {
 320   Input_file_argument file(arg, false, "", true, *this);
 321   cmdline->inputs().add_file(file);
 322 }
 323
 324 void
 325 General_options::parse_static(const char*, const char*, Command_line*)
 326 {
 327   this->set_static(true);
 328 }
 329
 330 void
 331 General_options::parse_script(const char*, const char* arg,
 332                               Command_line* cmdline)
 333 {
 334   if (!read_commandline_script(arg, cmdline))
 335     gold::gold_fatal(_("unable to parse script file %s"), arg);
 336 }
 337
 338 void
 339 General_options::parse_version_script(const char*, const char* arg,
 340                                       Command_line* cmdline)
 341 {
 342   if (!read_version_script(arg, cmdline))
 343     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 344 }
 345
 346 void
 347 General_options::parse_start_group(const char*, const char*,
 348                                    Command_line* cmdline)
 349 {
 350   cmdline->inputs().start_group();
 351 }
 352
 353 void
 354 General_options::parse_end_group(const char*, const char*,
 355                                  Command_line* cmdline)
 356 {
 357   cmdline->inputs().end_group();
 358 }
 359
 360 } // End namespace gold.
 361
 362 namespace
 363 {
 364
 365 void
 366 usage()
 367 {
 368   fprintf(stderr,
 369           _("%s: use the --help option for usage information\n"),
 370           gold::program_name);
 371   ::exit(EXIT_FAILURE);
 372 }
 373
 374 void
 375 usage(const char* msg, const char *opt)
 376 {
 377   fprintf(stderr,
 378           _("%s: %s: %s\n"),
 379           gold::program_name, opt, msg);
 380   usage();
 381 }
 382
 383 // Recognize input and output target names.  The GNU linker accepts
 384 // these with --format and --oformat.  This code is intended to be
 385 // minimally compatible.  In practice for an ELF target this would be
 386 // the same target as the input files; that name always start with
 387 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 388 // "binary", "ihex".
 389
 390 gold::General_options::Object_format
 391 string_to_object_format(const char* arg)
 392 {
 393   if (strncmp(arg, "elf", 3) == 0)
 394     return gold::General_options::OBJECT_FORMAT_ELF;
 395   else if (strcmp(arg, "binary") == 0)
 396     return gold::General_options::OBJECT_FORMAT_BINARY;
 397   else
 398     {
 399       gold::gold_error(_("format '%s' not supported; treating as elf "
 400                          "(supported formats: elf, binary)"),
 401                        arg);
 402       return gold::General_options::OBJECT_FORMAT_ELF;
 403     }
 404 }
 405
 406 // If the default sysroot is relocatable, try relocating it based on
 407 // the prefix FROM.
 408
 409 char*
 410 get_relative_sysroot(const char* from)
 411 {
 412   char* path = make_relative_prefix(gold::program_name, from,
 413                                     TARGET_SYSTEM_ROOT);
 414   if (path != NULL)
 415     {
 416       struct stat s;
 417       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 418         return path;
 419       free(path);
 420     }
 421
 422   return NULL;
 423 }
 424
 425 // Return the default sysroot.  This is set by the --with-sysroot
 426 // option to configure.  Note we do not free the return value of
 427 // get_relative_sysroot, which is a small memory leak, but is
 428 // necessary since we store this pointer directly in General_options.
 429
 430 const char*
 431 get_default_sysroot()
 432 {
 433   const char* sysroot = TARGET_SYSTEM_ROOT;
 434   if (*sysroot == '\0')
 435     return NULL;
 436
 437   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 438     {
 439       char* path = get_relative_sysroot(BINDIR);
 440       if (path == NULL)
 441         path = get_relative_sysroot(TOOLBINDIR);
 442       if (path != NULL)
 443         return path;
 444     }
 445
 446   return sysroot;
 447 }
 448
 449 // Parse a long option.  Such options have the form
 450 // <-|--><option>[=arg].  If "=arg" is not present but the option
 451 // takes an argument, the next word is taken to the be the argument.
 452 // If equals_only is set, then only the <option>=<arg> form is
 453 // accepted, not the <option><space><arg> form.  Returns a One_option
 454 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 455 // the not-NULL case, *arg is set to the option's argument (NULL if
 456 // the option takes no argument), and *i is advanced past this option.
 457 // NOTE: it is safe for argv and arg to point to the same place.
 458 gold::options::One_option*
 459 parse_long_option(int argc, const char** argv, bool equals_only,
 460                   const char** arg, int* i)
 461 {
 462   const char* const this_argv = argv[*i];
 463
 464   const char* equals = strchr(this_argv, '=');
 465   const char* option_start = this_argv + strspn(this_argv, "-");
 466   std::string option(option_start,
 467                      equals ? equals - option_start : strlen(option_start));
 468
 469   gold::options::Option_map::iterator it
 470       = gold::options::long_options->find(option);
 471   if (it == gold::options::long_options->end())
 472     return NULL;
 473
 474   gold::options::One_option* retval = it->second;
 475
 476   // If the dash-count doesn't match, we fail.
 477   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 478     {
 479       if (retval->dashes != gold::options::DASH_Z)
 480         return NULL;
 481     }
 482   else if (this_argv[1] != '-')   // one dash
 483     {
 484       if (retval->dashes != gold::options::ONE_DASH
 485           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 486           && retval->dashes != gold::options::TWO_DASHES)
 487         return NULL;
 488     }
 489   else                            // two dashes (or more!)
 490     {
 491       if (retval->dashes != gold::options::TWO_DASHES
 492           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 493           && retval->dashes != gold::options::ONE_DASH)
 494         return NULL;
 495     }
 496
 497   // Now that we know the option is good (or else bad in a way that
 498   // will cause us to die), increment i to point past this argv.
 499   ++(*i);
 500
 501   // Figure out the option's argument, if any.
 502   if (!retval->takes_argument())
 503     {
 504       if (equals)
 505         usage(_("unexpected argument"), this_argv);
 506       else
 507         *arg = NULL;
 508     }
 509   else
 510     {
 511       if (equals)
 512         *arg = equals + 1;
 513       else if (retval->takes_optional_argument())
 514         *arg = retval->default_value;
 515       else if (*i < argc && !equals_only)
 516         *arg = argv[(*i)++];
 517       else
 518         usage(_("missing argument"), this_argv);
 519     }
 520
 521   return retval;
 522 }
 523
 524 // Parse a short option.  Such options have the form -<option>[arg].
 525 // If "arg" is not present but the option takes an argument, the next
 526 // word is taken to the be the argument.  If the option does not take
 527 // an argument, it may be followed by another short option.  Returns a
 528 // One_option struct or NULL if argv[i] cannot be parsed as a short
 529 // option.  In the not-NULL case, *arg is set to the option's argument
 530 // (NULL if the option takes no argument), and *i is advanced past
 531 // this option.  This function keeps *i the same if we parsed a short
 532 // option that does not take an argument, that looks to be followed by
 533 // another short option in the same word.
 534 gold::options::One_option*
 535 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 536                    const char** arg, int* i)
 537 {
 538   const char* const this_argv = argv[*i];
 539
 540   if (this_argv[0] != '-')
 541     return NULL;
 542
 543   // We handle -z as a special case.
 544   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 545                                           'z', "", "-z", "Z-OPTION", false,
 546                                           NULL);
 547   gold::options::One_option* retval = NULL;
 548   if (this_argv[pos_in_argv_i] == 'z')
 549     retval = &dash_z;
 550   else
 551     {
 552       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 553       if (char_as_int > 0 && char_as_int < 128)
 554         retval = gold::options::short_options[char_as_int];
 555     }
 556
 557   if (retval == NULL)
 558     return NULL;
 559
 560   // Figure out the option's argument, if any.
 561   if (!retval->takes_argument())
 562     {
 563       *arg = NULL;
 564       // We only advance past this argument if it's the only one in argv.
 565       if (this_argv[pos_in_argv_i + 1] == '\0')
 566         ++(*i);
 567     }
 568   else
 569     {
 570       // If we take an argument, we'll eat up this entire argv entry.
 571       ++(*i);
 572       if (this_argv[pos_in_argv_i + 1] != '\0')
 573         *arg = this_argv + pos_in_argv_i + 1;
 574       else if (retval->takes_optional_argument())
 575         *arg = retval->default_value;
 576       else if (*i < argc)
 577         *arg = argv[(*i)++];
 578       else
 579         usage(_("missing argument"), this_argv);
 580     }
 581
 582   // If we're a -z option, we need to parse our argument as a
 583   // long-option, e.g. "-z stacksize=8192".
 584   if (retval == &dash_z)
 585     {
 586       int dummy_i = 0;
 587       const char* dash_z_arg = *arg;
 588       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 589       if (retval == NULL)
 590         usage(_("unknown -z option"), dash_z_arg);
 591     }
 592
 593   return retval;
 594 }
 595
 596 } // End anonymous namespace.
 597
 598 namespace gold
 599 {
 600
 601 General_options::General_options()
 602   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 603     do_demangle_(false)
 604 {
 605 }
 606
 607 General_options::Object_format
 608 General_options::format_enum() const
 609 {
 610   return string_to_object_format(this->format());
 611 }
 612
 613 General_options::Object_format
 614 General_options::oformat_enum() const
 615 {
 616   return string_to_object_format(this->oformat());
 617 }
 618
 619 // Add the sysroot, if any, to the search paths.
 620
 621 void
 622 General_options::add_sysroot()
 623 {
 624   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 625     {
 626       this->set_sysroot(get_default_sysroot());
 627       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 628         return;
 629     }
 630
 631   char* canonical_sysroot = lrealpath(this->sysroot());
 632
 633   for (Dir_list::iterator p = this->library_path_.value.begin();
 634        p != this->library_path_.value.end();
 635        ++p)
 636     p->add_sysroot(this->sysroot(), canonical_sysroot);
 637
 638   free(canonical_sysroot);
 639 }
 640
 641 // Set up variables and other state that isn't set up automatically by
 642 // the parse routine, and ensure options don't contradict each other
 643 // and are otherwise kosher.
 644
 645 void
 646 General_options::finalize()
 647 {
 648   // Normalize the strip modifiers.  They have a total order:
 649   // strip_all > strip_debug > strip_debug_gdb.  If one is true, set
 650   // all beneath it to true as well.
 651   if (this->strip_all())
 652     this->set_strip_debug(true);
 653   if (this->strip_debug())
 654     this->set_strip_debug_gdb(true);
 655
 656   // If the user specifies both -s and -r, convert the -s to -S.
 657   // -r requires us to keep externally visible symbols!
 658   if (this->strip_all() && this->relocatable())
 659     {
 660       this->set_strip_all(false);
 661       gold_assert(this->strip_debug());
 662     }
 663
 664   // For us, -dc and -dp are synonyms for --define-common.
 665   if (this->dc())
 666     this->set_define_common(true);
 667   if (this->dp())
 668     this->set_define_common(true);
 669
 670   // We also set --define-common if we're not relocatable, as long as
 671   // the user didn't explicitly ask for something different.
 672   if (!this->user_set_define_common())
 673     this->set_define_common(!this->relocatable());
 674
 675   // execstack_status_ is a three-state variable; update it based on
 676   // -z [no]execstack.
 677   if (this->execstack())
 678     this->set_execstack_status(EXECSTACK_YES);
 679   else if (this->noexecstack())
 680     this->set_execstack_status(EXECSTACK_NO);
 681
 682   // Handle the optional argument for --demangle.
 683   if (this->user_set_demangle())
 684     {
 685       this->set_do_demangle(true);
 686       const char* style = this->demangle();
 687       if (*style != '\0')
 688         {
 689           enum demangling_styles style_code;
 690
 691           style_code = cplus_demangle_name_to_style(style);
 692           if (style_code == unknown_demangling)
 693             gold_fatal("unknown demangling style '%s'", style);
 694           cplus_demangle_set_style(style_code);
 695         }
 696     }
 697   else if (this->user_set_no_demangle())
 698     this->set_do_demangle(false);
 699   else
 700     {
 701       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 702       // behaviour identical to that of gcc's linker wrapper.
 703       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 704     }
 705
 706   // If --thread_count is specified, it applies to
 707   // --thread-count-{initial,middle,final}, though it doesn't override
 708   // them.
 709   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 710     this->set_thread_count_initial(this->thread_count());
 711   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 712     this->set_thread_count_middle(this->thread_count());
 713   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 714     this->set_thread_count_final(this->thread_count());
 715
 716   // Let's warn if you set the thread-count but we're going to ignore it.
 717 #ifndef ENABLE_THREADS
 718   if (this->threads())
 719     {
 720       gold_warning(_("ignoring --threads: "
 721                      "%s was compiled without thread support"),
 722                    program_name);
 723       this->set_threads(false);
 724     }
 725   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 726       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 727     gold_warning(_("ignoring --thread-count: "
 728                    "%s was compiled without thread support"),
 729                  program_name);
 730 #endif
 731
 732   if (this->user_set_Y())
 733     {
 734       std::string s = this->Y();
 735       if (s.compare(0, 2, "P,") == 0)
 736         s.erase(0, 2);
 737
 738       size_t pos = 0;
 739       size_t next_pos;
 740       do
 741         {
 742           next_pos = s.find(':', pos);
 743           size_t len = (next_pos == std::string::npos
 744                         ? next_pos
 745                         : next_pos - pos);
 746           if (len != 0)
 747             this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
 748           pos = next_pos + 1;
 749         }
 750       while (next_pos != std::string::npos);
 751     }
 752   else
 753     {
 754       // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 755       // FIXME: We should only do this when configured in native mode.
 756       this->add_to_library_path_with_sysroot("/lib");
 757       this->add_to_library_path_with_sysroot("/usr/lib");
 758     }
 759
 760   // Normalize library_path() by adding the sysroot to all directories
 761   // in the path, as appropriate.
 762   this->add_sysroot();
 763
 764   // Now that we've normalized the options, check for contradictory ones.
 765   if (this->shared() && this->relocatable())
 766     gold_fatal(_("-shared and -r are incompatible"));
 767
 768   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 769       && (this->shared() || this->relocatable()))
 770     gold_fatal(_("binary output format not compatible with -shared or -r"));
 771
 772   if (this->user_set_hash_bucket_empty_fraction()
 773       && (this->hash_bucket_empty_fraction() < 0.0
 774           || this->hash_bucket_empty_fraction() >= 1.0))
 775     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 776                  "[0.0, 1.0)"),
 777                this->hash_bucket_empty_fraction());
 778
 779   // FIXME: we can/should be doing a lot more sanity checking here.
 780 }
 781
 782 // Search_directory methods.
 783
 784 // This is called if we have a sysroot.  Apply the sysroot if
 785 // appropriate.  Record whether the directory is in the sysroot.
 786
 787 void
 788 Search_directory::add_sysroot(const char* sysroot,
 789                               const char* canonical_sysroot)
 790 {
 791   gold_assert(*sysroot != '\0');
 792   if (this->put_in_sysroot_)
 793     {
 794       if (!IS_DIR_SEPARATOR(this->name_[0])
 795           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 796         this->name_ = '/' + this->name_;
 797       this->name_ = sysroot + this->name_;
 798       this->is_in_sysroot_ = true;
 799     }
 800   else
 801     {
 802       // Check whether this entry is in the sysroot.  To do this
 803       // correctly, we need to use canonical names.  Otherwise we will
 804       // get confused by the ../../.. paths that gcc tends to use.
 805       char* canonical_name = lrealpath(this->name_.c_str());
 806       int canonical_name_len = strlen(canonical_name);
 807       int canonical_sysroot_len = strlen(canonical_sysroot);
 808       if (canonical_name_len > canonical_sysroot_len
 809           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 810         {
 811           canonical_name[canonical_sysroot_len] = '\0';
 812           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 813             this->is_in_sysroot_ = true;
 814         }
 815       free(canonical_name);
 816     }
 817 }
 818
 819 // Input_arguments methods.
 820
 821 // Add a file to the list.
 822
 823 void
 824 Input_arguments::add_file(const Input_file_argument& file)
 825 {
 826   if (!this->in_group_)
 827     this->input_argument_list_.push_back(Input_argument(file));
 828   else
 829     {
 830       gold_assert(!this->input_argument_list_.empty());
 831       gold_assert(this->input_argument_list_.back().is_group());
 832       this->input_argument_list_.back().group()->add_file(file);
 833     }
 834 }
 835
 836 // Start a group.
 837
 838 void
 839 Input_arguments::start_group()
 840 {
 841   if (this->in_group_)
 842     gold_fatal(_("May not nest groups"));
 843   Input_file_group* group = new Input_file_group();
 844   this->input_argument_list_.push_back(Input_argument(group));
 845   this->in_group_ = true;
 846 }
 847
 848 // End a group.
 849
 850 void
 851 Input_arguments::end_group()
 852 {
 853   if (!this->in_group_)
 854     gold_fatal(_("Group end without group start"));
 855   this->in_group_ = false;
 856 }
 857
 858 // Command_line options.
 859
 860 Command_line::Command_line()
 861 {
 862 }
 863
 864 // Process the command line options.  For process_one_option, i is the
 865 // index of argv to process next, and must be an option (that is,
 866 // start with a dash).  The return value is the index of the next
 867 // option to process (i+1 or i+2, or argc to indicate processing is
 868 // done).  no_more_options is set to true if (and when) "--" is seen
 869 // as an option.
 870
 871 int
 872 Command_line::process_one_option(int argc, const char** argv, int i,
 873                                  bool* no_more_options)
 874 {
 875   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 876
 877   // If we are reading "--", then just set no_more_options and return.
 878   if (argv[i][1] == '-' && argv[i][2] == '\0')
 879     {
 880       *no_more_options = true;
 881       return i + 1;
 882     }
 883
 884   int new_i = i;
 885   options::One_option* option = NULL;
 886   const char* arg = NULL;
 887
 888   // First, try to process argv as a long option.
 889   option = parse_long_option(argc, argv, false, &arg, &new_i);
 890   if (option)
 891     {
 892       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 893       return new_i;
 894     }
 895
 896   // Now, try to process argv as a short option.  Since several short
 897   // options can be combined in one argv, we may have to parse a lot
 898   // until we're done reading this argv.
 899   int pos_in_argv_i = 1;
 900   while (new_i == i)
 901     {
 902       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 903       if (!option)
 904         break;
 905       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 906       ++pos_in_argv_i;
 907     }
 908   if (option)
 909     return new_i;
 910
 911   // I guess it's neither a long option nor a short option.
 912   usage(_("unknown option"), argv[i]);
 913   return argc;
 914 }
 915
 916
 917 void
 918 Command_line::process(int argc, const char** argv)
 919 {
 920   bool no_more_options = false;
 921   int i = 0;
 922   while (i < argc)
 923     {
 924       this->position_options_.copy_from_options(this->options());
 925       if (no_more_options || argv[i][0] != '-')
 926         {
 927           Input_file_argument file(argv[i], false, "", false,
 928                                    this->position_options_);
 929           this->inputs_.add_file(file);
 930           ++i;
 931         }
 932       else
 933         i = process_one_option(argc, argv, i, &no_more_options);
 934     }
 935
 936   if (this->inputs_.in_group())
 937     {
 938       fprintf(stderr, _("%s: missing group end\n"), program_name);
 939       usage();
 940     }
 941
 942   // Normalize the options and ensure they don't contradict each other.
 943   this->options_.finalize();
 944 }
 945
 946 } // End namespace gold.