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_defsym(const char*, const char* arg,
 286                               Command_line* cmdline)
 287 {
 288   cmdline->script_options().define_symbol(arg);
 289 }
 290
 291 void
 292 General_options::parse_library(const char*, const char* arg,
 293                                Command_line* cmdline)
 294 {
 295   Input_file_argument file(arg, true, "", false, *this);
 296   cmdline->inputs().add_file(file);
 297 }
 298
 299 void
 300 General_options::parse_R(const char* option, const char* arg,
 301                          Command_line* cmdline)
 302 {
 303   struct stat s;
 304   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 305     this->add_to_rpath(arg);
 306   else
 307     this->parse_just_symbols(option, arg, cmdline);
 308 }
 309
 310 void
 311 General_options::parse_just_symbols(const char*, const char* arg,
 312                                     Command_line* cmdline)
 313 {
 314   Input_file_argument file(arg, false, "", true, *this);
 315   cmdline->inputs().add_file(file);
 316 }
 317
 318 void
 319 General_options::parse_static(const char*, const char*, Command_line*)
 320 {
 321   this->set_static(true);
 322 }
 323
 324 void
 325 General_options::parse_script(const char*, const char* arg,
 326                               Command_line* cmdline)
 327 {
 328   if (!read_commandline_script(arg, cmdline))
 329     gold::gold_fatal(_("unable to parse script file %s"), arg);
 330 }
 331
 332 void
 333 General_options::parse_version_script(const char*, const char* arg,
 334                                       Command_line* cmdline)
 335 {
 336   if (!read_version_script(arg, cmdline))
 337     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 338 }
 339
 340 void
 341 General_options::parse_start_group(const char*, const char*,
 342                                    Command_line* cmdline)
 343 {
 344   cmdline->inputs().start_group();
 345 }
 346
 347 void
 348 General_options::parse_end_group(const char*, const char*,
 349                                  Command_line* cmdline)
 350 {
 351   cmdline->inputs().end_group();
 352 }
 353
 354 } // End namespace gold.
 355
 356 namespace
 357 {
 358
 359 void
 360 usage()
 361 {
 362   fprintf(stderr,
 363           _("%s: use the --help option for usage information\n"),
 364           gold::program_name);
 365   ::exit(EXIT_FAILURE);
 366 }
 367
 368 void
 369 usage(const char* msg, const char *opt)
 370 {
 371   fprintf(stderr,
 372           _("%s: %s: %s\n"),
 373           gold::program_name, opt, msg);
 374   usage();
 375 }
 376
 377 // Recognize input and output target names.  The GNU linker accepts
 378 // these with --format and --oformat.  This code is intended to be
 379 // minimally compatible.  In practice for an ELF target this would be
 380 // the same target as the input files; that name always start with
 381 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 382 // "binary", "ihex".
 383
 384 gold::General_options::Object_format
 385 string_to_object_format(const char* arg)
 386 {
 387   if (strncmp(arg, "elf", 3) == 0)
 388     return gold::General_options::OBJECT_FORMAT_ELF;
 389   else if (strcmp(arg, "binary") == 0)
 390     return gold::General_options::OBJECT_FORMAT_BINARY;
 391   else
 392     {
 393       gold::gold_error(_("format '%s' not supported; treating as elf "
 394                          "(supported formats: elf, binary)"),
 395                        arg);
 396       return gold::General_options::OBJECT_FORMAT_ELF;
 397     }
 398 }
 399
 400 // If the default sysroot is relocatable, try relocating it based on
 401 // the prefix FROM.
 402
 403 char*
 404 get_relative_sysroot(const char* from)
 405 {
 406   char* path = make_relative_prefix(gold::program_name, from,
 407                                     TARGET_SYSTEM_ROOT);
 408   if (path != NULL)
 409     {
 410       struct stat s;
 411       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 412         return path;
 413       free(path);
 414     }
 415
 416   return NULL;
 417 }
 418
 419 // Return the default sysroot.  This is set by the --with-sysroot
 420 // option to configure.  Note we do not free the return value of
 421 // get_relative_sysroot, which is a small memory leak, but is
 422 // necessary since we store this pointer directly in General_options.
 423
 424 const char*
 425 get_default_sysroot()
 426 {
 427   const char* sysroot = TARGET_SYSTEM_ROOT;
 428   if (*sysroot == '\0')
 429     return NULL;
 430
 431   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 432     {
 433       char* path = get_relative_sysroot(BINDIR);
 434       if (path == NULL)
 435         path = get_relative_sysroot(TOOLBINDIR);
 436       if (path != NULL)
 437         return path;
 438     }
 439
 440   return sysroot;
 441 }
 442
 443 // Parse a long option.  Such options have the form
 444 // <-|--><option>[=arg].  If "=arg" is not present but the option
 445 // takes an argument, the next word is taken to the be the argument.
 446 // If equals_only is set, then only the <option>=<arg> form is
 447 // accepted, not the <option><space><arg> form.  Returns a One_option
 448 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 449 // the not-NULL case, *arg is set to the option's argument (NULL if
 450 // the option takes no argument), and *i is advanced past this option.
 451 // NOTE: it is safe for argv and arg to point to the same place.
 452 gold::options::One_option*
 453 parse_long_option(int argc, const char** argv, bool equals_only,
 454                   const char** arg, int* i)
 455 {
 456   const char* const this_argv = argv[*i];
 457
 458   const char* equals = strchr(this_argv, '=');
 459   const char* option_start = this_argv + strspn(this_argv, "-");
 460   std::string option(option_start,
 461                      equals ? equals - option_start : strlen(option_start));
 462
 463   gold::options::Option_map::iterator it
 464       = gold::options::long_options->find(option);
 465   if (it == gold::options::long_options->end())
 466     return NULL;
 467
 468   gold::options::One_option* retval = it->second;
 469
 470   // If the dash-count doesn't match, we fail.
 471   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 472     {
 473       if (retval->dashes != gold::options::DASH_Z)
 474         return NULL;
 475     }
 476   else if (this_argv[1] != '-')   // one dash
 477     {
 478       if (retval->dashes != gold::options::ONE_DASH
 479           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 480           && retval->dashes != gold::options::TWO_DASHES)
 481         return NULL;
 482     }
 483   else                            // two dashes (or more!)
 484     {
 485       if (retval->dashes != gold::options::TWO_DASHES
 486           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 487           && retval->dashes != gold::options::ONE_DASH)
 488         return NULL;
 489     }
 490
 491   // Now that we know the option is good (or else bad in a way that
 492   // will cause us to die), increment i to point past this argv.
 493   ++(*i);
 494
 495   // Figure out the option's argument, if any.
 496   if (!retval->takes_argument())
 497     {
 498       if (equals)
 499         usage(_("unexpected argument"), this_argv);
 500       else
 501         *arg = NULL;
 502     }
 503   else
 504     {
 505       if (equals)
 506         *arg = equals + 1;
 507       else if (retval->takes_optional_argument())
 508         *arg = retval->default_value;
 509       else if (*i < argc && !equals_only)
 510         *arg = argv[(*i)++];
 511       else
 512         usage(_("missing argument"), this_argv);
 513     }
 514
 515   return retval;
 516 }
 517
 518 // Parse a short option.  Such options have the form -<option>[arg].
 519 // If "arg" is not present but the option takes an argument, the next
 520 // word is taken to the be the argument.  If the option does not take
 521 // an argument, it may be followed by another short option.  Returns a
 522 // One_option struct or NULL if argv[i] cannot be parsed as a short
 523 // option.  In the not-NULL case, *arg is set to the option's argument
 524 // (NULL if the option takes no argument), and *i is advanced past
 525 // this option.  This function keeps *i the same if we parsed a short
 526 // option that does not take an argument, that looks to be followed by
 527 // another short option in the same word.
 528 gold::options::One_option*
 529 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 530                    const char** arg, int* i)
 531 {
 532   const char* const this_argv = argv[*i];
 533
 534   if (this_argv[0] != '-')
 535     return NULL;
 536
 537   // We handle -z as a special case.
 538   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 539                                           'z', "", "-z", "Z-OPTION", false,
 540                                           NULL);
 541   gold::options::One_option* retval = NULL;
 542   if (this_argv[pos_in_argv_i] == 'z')
 543     retval = &dash_z;
 544   else
 545     {
 546       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 547       if (char_as_int > 0 && char_as_int < 128)
 548         retval = gold::options::short_options[char_as_int];
 549     }
 550
 551   if (retval == NULL)
 552     return NULL;
 553
 554   // Figure out the option's argument, if any.
 555   if (!retval->takes_argument())
 556     {
 557       *arg = NULL;
 558       // We only advance past this argument if it's the only one in argv.
 559       if (this_argv[pos_in_argv_i + 1] == '\0')
 560         ++(*i);
 561     }
 562   else
 563     {
 564       // If we take an argument, we'll eat up this entire argv entry.
 565       ++(*i);
 566       if (this_argv[pos_in_argv_i + 1] != '\0')
 567         *arg = this_argv + pos_in_argv_i + 1;
 568       else if (retval->takes_optional_argument())
 569         *arg = retval->default_value;
 570       else if (*i < argc)
 571         *arg = argv[(*i)++];
 572       else
 573         usage(_("missing argument"), this_argv);
 574     }
 575
 576   // If we're a -z option, we need to parse our argument as a
 577   // long-option, e.g. "-z stacksize=8192".
 578   if (retval == &dash_z)
 579     {
 580       int dummy_i = 0;
 581       const char* dash_z_arg = *arg;
 582       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 583       if (retval == NULL)
 584         usage(_("unknown -z option"), dash_z_arg);
 585     }
 586
 587   return retval;
 588 }
 589
 590 } // End anonymous namespace.
 591
 592 namespace gold
 593 {
 594
 595 General_options::General_options()
 596   : execstack_status_(General_options::EXECSTACK_FROM_INPUT), static_(false),
 597     do_demangle_(false)
 598 {
 599 }
 600
 601 General_options::Object_format
 602 General_options::format_enum() const
 603 {
 604   return string_to_object_format(this->format());
 605 }
 606
 607 General_options::Object_format
 608 General_options::oformat_enum() const
 609 {
 610   return string_to_object_format(this->oformat());
 611 }
 612
 613 // Add the sysroot, if any, to the search paths.
 614
 615 void
 616 General_options::add_sysroot()
 617 {
 618   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 619     {
 620       this->set_sysroot(get_default_sysroot());
 621       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
 622         return;
 623     }
 624
 625   char* canonical_sysroot = lrealpath(this->sysroot());
 626
 627   for (Dir_list::iterator p = this->library_path_.value.begin();
 628        p != this->library_path_.value.end();
 629        ++p)
 630     p->add_sysroot(this->sysroot(), canonical_sysroot);
 631
 632   free(canonical_sysroot);
 633 }
 634
 635 // Set up variables and other state that isn't set up automatically by
 636 // the parse routine, and ensure options don't contradict each other
 637 // and are otherwise kosher.
 638
 639 void
 640 General_options::finalize()
 641 {
 642   // Normalize the strip modifiers.  They have a total order:
 643   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
 644   // If one is true, set all beneath it to true as well.
 645   if (this->strip_all())
 646     this->set_strip_debug(true);
 647   if (this->strip_debug())
 648     this->set_strip_debug_non_line(true);
 649   if (this->strip_debug_non_line())
 650     this->set_strip_debug_gdb(true);
 651
 652   // If the user specifies both -s and -r, convert the -s to -S.
 653   // -r requires us to keep externally visible symbols!
 654   if (this->strip_all() && this->relocatable())
 655     {
 656       this->set_strip_all(false);
 657       gold_assert(this->strip_debug());
 658     }
 659
 660   // For us, -dc and -dp are synonyms for --define-common.
 661   if (this->dc())
 662     this->set_define_common(true);
 663   if (this->dp())
 664     this->set_define_common(true);
 665
 666   // We also set --define-common if we're not relocatable, as long as
 667   // the user didn't explicitly ask for something different.
 668   if (!this->user_set_define_common())
 669     this->set_define_common(!this->relocatable());
 670
 671   // execstack_status_ is a three-state variable; update it based on
 672   // -z [no]execstack.
 673   if (this->execstack())
 674     this->set_execstack_status(EXECSTACK_YES);
 675   else if (this->noexecstack())
 676     this->set_execstack_status(EXECSTACK_NO);
 677
 678   // Handle the optional argument for --demangle.
 679   if (this->user_set_demangle())
 680     {
 681       this->set_do_demangle(true);
 682       const char* style = this->demangle();
 683       if (*style != '\0')
 684         {
 685           enum demangling_styles style_code;
 686
 687           style_code = cplus_demangle_name_to_style(style);
 688           if (style_code == unknown_demangling)
 689             gold_fatal("unknown demangling style '%s'", style);
 690           cplus_demangle_set_style(style_code);
 691         }
 692     }
 693   else if (this->user_set_no_demangle())
 694     this->set_do_demangle(false);
 695   else
 696     {
 697       // Testing COLLECT_NO_DEMANGLE makes our default demangling
 698       // behaviour identical to that of gcc's linker wrapper.
 699       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
 700     }
 701
 702   // -M is equivalent to "-Map -".
 703   if (this->print_map() && !this->user_set_Map())
 704     {
 705       this->set_Map("-");
 706       this->set_user_set_Map();
 707     }
 708
 709   // If --thread_count is specified, it applies to
 710   // --thread-count-{initial,middle,final}, though it doesn't override
 711   // them.
 712   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
 713     this->set_thread_count_initial(this->thread_count());
 714   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
 715     this->set_thread_count_middle(this->thread_count());
 716   if (this->thread_count() > 0 && this->thread_count_final() == 0)
 717     this->set_thread_count_final(this->thread_count());
 718
 719   // Let's warn if you set the thread-count but we're going to ignore it.
 720 #ifndef ENABLE_THREADS
 721   if (this->threads())
 722     {
 723       gold_warning(_("ignoring --threads: "
 724                      "%s was compiled without thread support"),
 725                    program_name);
 726       this->set_threads(false);
 727     }
 728   if (this->thread_count() > 0 || this->thread_count_initial() > 0
 729       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
 730     gold_warning(_("ignoring --thread-count: "
 731                    "%s was compiled without thread support"),
 732                  program_name);
 733 #endif
 734
 735   if (this->user_set_Y())
 736     {
 737       std::string s = this->Y();
 738       if (s.compare(0, 2, "P,") == 0)
 739         s.erase(0, 2);
 740
 741       size_t pos = 0;
 742       size_t next_pos;
 743       do
 744         {
 745           next_pos = s.find(':', pos);
 746           size_t len = (next_pos == std::string::npos
 747                         ? next_pos
 748                         : next_pos - pos);
 749           if (len != 0)
 750             this->add_to_library_path_with_sysroot(s.substr(pos, len).c_str());
 751           pos = next_pos + 1;
 752         }
 753       while (next_pos != std::string::npos);
 754     }
 755   else
 756     {
 757       // Even if they don't specify it, we add -L /lib and -L /usr/lib.
 758       // FIXME: We should only do this when configured in native mode.
 759       this->add_to_library_path_with_sysroot("/lib");
 760       this->add_to_library_path_with_sysroot("/usr/lib");
 761     }
 762
 763   // Normalize library_path() by adding the sysroot to all directories
 764   // in the path, as appropriate.
 765   this->add_sysroot();
 766
 767   // Now that we've normalized the options, check for contradictory ones.
 768   if (this->shared() && this->relocatable())
 769     gold_fatal(_("-shared and -r are incompatible"));
 770
 771   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
 772       && (this->shared() || this->relocatable()))
 773     gold_fatal(_("binary output format not compatible with -shared or -r"));
 774
 775   if (this->user_set_hash_bucket_empty_fraction()
 776       && (this->hash_bucket_empty_fraction() < 0.0
 777           || this->hash_bucket_empty_fraction() >= 1.0))
 778     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
 779                  "[0.0, 1.0)"),
 780                this->hash_bucket_empty_fraction());
 781
 782   // FIXME: we can/should be doing a lot more sanity checking here.
 783 }
 784
 785 // Search_directory methods.
 786
 787 // This is called if we have a sysroot.  Apply the sysroot if
 788 // appropriate.  Record whether the directory is in the sysroot.
 789
 790 void
 791 Search_directory::add_sysroot(const char* sysroot,
 792                               const char* canonical_sysroot)
 793 {
 794   gold_assert(*sysroot != '\0');
 795   if (this->put_in_sysroot_)
 796     {
 797       if (!IS_DIR_SEPARATOR(this->name_[0])
 798           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 799         this->name_ = '/' + this->name_;
 800       this->name_ = sysroot + this->name_;
 801       this->is_in_sysroot_ = true;
 802     }
 803   else
 804     {
 805       // Check whether this entry is in the sysroot.  To do this
 806       // correctly, we need to use canonical names.  Otherwise we will
 807       // get confused by the ../../.. paths that gcc tends to use.
 808       char* canonical_name = lrealpath(this->name_.c_str());
 809       int canonical_name_len = strlen(canonical_name);
 810       int canonical_sysroot_len = strlen(canonical_sysroot);
 811       if (canonical_name_len > canonical_sysroot_len
 812           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 813         {
 814           canonical_name[canonical_sysroot_len] = '\0';
 815           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 816             this->is_in_sysroot_ = true;
 817         }
 818       free(canonical_name);
 819     }
 820 }
 821
 822 // Input_arguments methods.
 823
 824 // Add a file to the list.
 825
 826 void
 827 Input_arguments::add_file(const Input_file_argument& file)
 828 {
 829   if (!this->in_group_)
 830     this->input_argument_list_.push_back(Input_argument(file));
 831   else
 832     {
 833       gold_assert(!this->input_argument_list_.empty());
 834       gold_assert(this->input_argument_list_.back().is_group());
 835       this->input_argument_list_.back().group()->add_file(file);
 836     }
 837 }
 838
 839 // Start a group.
 840
 841 void
 842 Input_arguments::start_group()
 843 {
 844   if (this->in_group_)
 845     gold_fatal(_("May not nest groups"));
 846   Input_file_group* group = new Input_file_group();
 847   this->input_argument_list_.push_back(Input_argument(group));
 848   this->in_group_ = true;
 849 }
 850
 851 // End a group.
 852
 853 void
 854 Input_arguments::end_group()
 855 {
 856   if (!this->in_group_)
 857     gold_fatal(_("Group end without group start"));
 858   this->in_group_ = false;
 859 }
 860
 861 // Command_line options.
 862
 863 Command_line::Command_line()
 864 {
 865 }
 866
 867 // Process the command line options.  For process_one_option, i is the
 868 // index of argv to process next, and must be an option (that is,
 869 // start with a dash).  The return value is the index of the next
 870 // option to process (i+1 or i+2, or argc to indicate processing is
 871 // done).  no_more_options is set to true if (and when) "--" is seen
 872 // as an option.
 873
 874 int
 875 Command_line::process_one_option(int argc, const char** argv, int i,
 876                                  bool* no_more_options)
 877 {
 878   gold_assert(argv[i][0] == '-' && !(*no_more_options));
 879
 880   // If we are reading "--", then just set no_more_options and return.
 881   if (argv[i][1] == '-' && argv[i][2] == '\0')
 882     {
 883       *no_more_options = true;
 884       return i + 1;
 885     }
 886
 887   int new_i = i;
 888   options::One_option* option = NULL;
 889   const char* arg = NULL;
 890
 891   // First, try to process argv as a long option.
 892   option = parse_long_option(argc, argv, false, &arg, &new_i);
 893   if (option)
 894     {
 895       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 896       return new_i;
 897     }
 898
 899   // Now, try to process argv as a short option.  Since several short
 900   // options can be combined in one argv, we may have to parse a lot
 901   // until we're done reading this argv.
 902   int pos_in_argv_i = 1;
 903   while (new_i == i)
 904     {
 905       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
 906       if (!option)
 907         break;
 908       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
 909       ++pos_in_argv_i;
 910     }
 911   if (option)
 912     return new_i;
 913
 914   // I guess it's neither a long option nor a short option.
 915   usage(_("unknown option"), argv[i]);
 916   return argc;
 917 }
 918
 919
 920 void
 921 Command_line::process(int argc, const char** argv)
 922 {
 923   bool no_more_options = false;
 924   int i = 0;
 925   while (i < argc)
 926     {
 927       this->position_options_.copy_from_options(this->options());
 928       if (no_more_options || argv[i][0] != '-')
 929         {
 930           Input_file_argument file(argv[i], false, "", false,
 931                                    this->position_options_);
 932           this->inputs_.add_file(file);
 933           ++i;
 934         }
 935       else
 936         i = process_one_option(argc, argv, i, &no_more_options);
 937     }
 938
 939   if (this->inputs_.in_group())
 940     {
 941       fprintf(stderr, _("%s: missing group end\n"), program_name);
 942       usage();
 943     }
 944
 945   // Normalize the options and ensure they don't contradict each other.
 946   this->options_.finalize();
 947 }
 948
 949 } // End namespace gold.