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