gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright (C) 2006-2024 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 <cerrno>
  26 #include <cstdlib>
  27 #include <cstring>
  28 #include <fstream>
  29 #include <vector>
  30 #include <iostream>
  31 #include <sys/stat.h>
  32 #include "filenames.h"
  33 #include "libiberty.h"
  34 #include "demangle.h"
  35 #include "../bfd/bfdver.h"
  36
  37 #include "debug.h"
  38 #include "script.h"
  39 #include "target-select.h"
  40 #include "options.h"
  41 #include "plugin.h"
  42
  43 namespace gold
  44 {
  45
  46 General_options
  47 Position_dependent_options::default_options_;
  48
  49 namespace options
  50 {
  51
  52 // This flag is TRUE if we should register the command-line options as they
  53 // are constructed.  It is set after construction of the options within
  54 // class Position_dependent_options.
  55 static bool ready_to_register = false;
  56
  57 // This global variable is set up as General_options is constructed.
  58 static std::vector<const One_option*> registered_options;
  59
  60 // These are set up at the same time -- the variables that accept one
  61 // dash, two, or require -z.  A single variable may be in more than
  62 // one of these data structures.
  63 typedef Unordered_map<std::string, One_option*> Option_map;
  64 static Option_map* long_options = NULL;
  65 static One_option* short_options[128];
  66
  67 void
  68 One_option::register_option()
  69 {
  70   if (!ready_to_register)
  71     return;
  72
  73   registered_options.push_back(this);
  74
  75   // We can't make long_options a static Option_map because we can't
  76   // guarantee that will be initialized before register_option() is
  77   // first called.
  78   if (long_options == NULL)
  79     long_options = new Option_map;
  80
  81   // TWO_DASHES means that two dashes are preferred, but one is ok too.
  82   if (!this->longname.empty())
  83     (*long_options)[this->longname] = this;
  84
  85   const int shortname_as_int = static_cast<int>(this->shortname);
  86   gold_assert(shortname_as_int >= 0 && shortname_as_int < 128);
  87   if (this->shortname != '\0')
  88     {
  89       gold_assert(short_options[shortname_as_int] == NULL);
  90       short_options[shortname_as_int] = this;
  91     }
  92 }
  93
  94 void
  95 One_option::print() const
  96 {
  97   bool comma = false;
  98   printf("  ");
  99   int len = 2;
 100   if (this->shortname != '\0')
 101     {
 102       len += printf("-%c", this->shortname);
 103       if (this->helparg)
 104         {
 105           // -z takes long-names only.
 106           gold_assert(this->dashes != DASH_Z);
 107           len += printf(" %s", gettext(this->helparg));
 108         }
 109       comma = true;
 110     }
 111   if (!this->longname.empty()
 112       && !(this->longname[0] == this->shortname
 113            && this->longname[1] == '\0'))
 114     {
 115       if (comma)
 116         len += printf(", ");
 117       switch (this->dashes)
 118         {
 119         case options::ONE_DASH: case options::EXACTLY_ONE_DASH:
 120           len += printf("-");
 121           break;
 122         case options::TWO_DASHES: case options::EXACTLY_TWO_DASHES:
 123           len += printf("--");
 124           break;
 125         case options::DASH_Z:
 126           len += printf("-z ");
 127           break;
 128         default:
 129           gold_unreachable();
 130         }
 131       len += printf("%s", this->longname.c_str());
 132       if (this->helparg)
 133         {
 134           // For most options, we print "--frob FOO".  But for -z
 135           // we print "-z frob=FOO".
 136           len += printf("%c%s", this->dashes == options::DASH_Z ? '=' : ' ',
 137                         gettext(this->helparg));
 138         }
 139     }
 140
 141   if (len >= 30)
 142     {
 143       printf("\n");
 144       len = 0;
 145     }
 146   for (; len < 30; ++len)
 147     std::putchar(' ');
 148
 149   printf("%s", gettext(this->helpstring));
 150   if (this->is_default)
 151     printf(" (%s)", _("default"));
 152   printf("\n");
 153 }
 154
 155 void
 156 help()
 157 {
 158   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 159
 160   std::vector<const One_option*>::const_iterator it;
 161   for (it = registered_options.begin(); it != registered_options.end(); ++it)
 162     (*it)->print();
 163
 164   // config.guess and libtool.m4 look in ld --help output for the
 165   // string "supported targets".
 166   printf(_("%s: supported targets:"), gold::program_name);
 167   std::vector<const char*> supported_names;
 168   gold::supported_target_names(&supported_names);
 169   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 170        p != supported_names.end();
 171        ++p)
 172     printf(" %s", *p);
 173   printf("\n");
 174
 175   printf(_("%s: supported emulations:"), gold::program_name);
 176   supported_names.clear();
 177   gold::supported_emulation_names(&supported_names);
 178   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 179        p != supported_names.end();
 180        ++p)
 181     printf(" %s", *p);
 182   printf("\n");
 183
 184   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
 185   const char* report = REPORT_BUGS_TO;
 186   if (*report != '\0')
 187     printf(_("Report bugs to %s\n"), report);
 188 }
 189
 190 // For bool, arg will be NULL (boolean options take no argument);
 191 // we always just set to true.
 192 void
 193 parse_bool(const char*, const char*, bool* retval)
 194 {
 195   *retval = true;
 196 }
 197
 198 void
 199 parse_uint(const char* option_name, const char* arg, int* retval)
 200 {
 201   char* endptr;
 202   *retval = strtol(arg, &endptr, 0);
 203   if (*endptr != '\0' || *retval < 0)
 204     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 205                option_name, arg);
 206 }
 207
 208 void
 209 parse_int(const char* option_name, const char* arg, int* retval)
 210 {
 211   char* endptr;
 212   *retval = strtol(arg, &endptr, 0);
 213   if (*endptr != '\0')
 214     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 215                option_name, arg);
 216 }
 217
 218 void
 219 parse_uint64(const char* option_name, const char* arg, uint64_t* retval)
 220 {
 221   char* endptr;
 222   *retval = strtoull(arg, &endptr, 0);
 223   if (*endptr != '\0')
 224     gold_fatal(_("%s: invalid option value (expected an integer): %s"),
 225                option_name, arg);
 226 }
 227
 228 void
 229 parse_double(const char* option_name, const char* arg, double* retval)
 230 {
 231   char* endptr;
 232   *retval = strtod(arg, &endptr);
 233   if (*endptr != '\0')
 234     gold_fatal(_("%s: invalid option value "
 235                  "(expected a floating point number): %s"),
 236                option_name, arg);
 237 }
 238
 239 void
 240 parse_percent(const char* option_name, const char* arg, double* retval)
 241 {
 242   char* endptr;
 243   *retval = strtod(arg, &endptr) / 100.0;
 244   if (*endptr != '\0')
 245     gold_fatal(_("%s: invalid option value "
 246                  "(expected a floating point number): %s"),
 247                option_name, arg);
 248 }
 249
 250 void
 251 parse_string(const char* option_name, const char* arg, const char** retval)
 252 {
 253   if (*arg == '\0')
 254     gold_fatal(_("%s: must take a non-empty argument"), option_name);
 255   *retval = arg;
 256 }
 257
 258 void
 259 parse_optional_string(const char*, const char* arg, const char** retval)
 260 {
 261   *retval = arg;
 262 }
 263
 264 void
 265 parse_dirlist(const char*, const char* arg, Dir_list* retval)
 266 {
 267   retval->push_back(Search_directory(arg, false));
 268 }
 269
 270 void
 271 parse_set(const char*, const char* arg, String_set* retval)
 272 {
 273   retval->insert(std::string(arg));
 274 }
 275
 276 void
 277 parse_choices(const char* option_name, const char* arg, const char** retval,
 278               const char* choices[], int num_choices)
 279 {
 280   for (int i = 0; i < num_choices; i++)
 281     if (strcmp(choices[i], arg) == 0)
 282       {
 283         *retval = arg;
 284         return;
 285       }
 286
 287   // If we get here, the user did not enter a valid choice, so we die.
 288   std::string choices_list;
 289   for (int i = 0; i < num_choices; i++)
 290     {
 291       choices_list += choices[i];
 292       if (i != num_choices - 1)
 293         choices_list += ", ";
 294     }
 295   gold_fatal(_("%s: must take one of the following arguments: %s"),
 296              option_name, choices_list.c_str());
 297 }
 298
 299 } // End namespace options.
 300
 301 // Define the handler for "special" options (set via DEFINE_special).
 302
 303 void
 304 General_options::parse_help(const char*, const char*, Command_line*)
 305 {
 306   options::help();
 307   ::exit(EXIT_SUCCESS);
 308 }
 309
 310 void
 311 General_options::parse_version(const char* opt, const char*, Command_line*)
 312 {
 313   bool print_short = (opt[0] == '-' && opt[1] == 'v');
 314   gold::print_version(print_short);
 315   this->printed_version_ = true;
 316   if (!print_short)
 317     ::exit(EXIT_SUCCESS);
 318 }
 319
 320 void
 321 General_options::parse_V(const char*, const char*, Command_line*)
 322 {
 323   gold::print_version(true);
 324   this->printed_version_ = true;
 325
 326   printf(_("  Supported targets:\n"));
 327   std::vector<const char*> supported_names;
 328   gold::supported_target_names(&supported_names);
 329   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 330        p != supported_names.end();
 331        ++p)
 332     printf("   %s\n", *p);
 333
 334   printf(_("  Supported emulations:\n"));
 335   supported_names.clear();
 336   gold::supported_emulation_names(&supported_names);
 337   for (std::vector<const char*>::const_iterator p = supported_names.begin();
 338        p != supported_names.end();
 339        ++p)
 340     printf("   %s\n", *p);
 341 }
 342
 343 void
 344 General_options::parse_Bno_symbolic(const char*, const char*,
 345                                     Command_line*)
 346 {
 347   this->bsymbolic_ = BSYMBOLIC_NONE;
 348 }
 349
 350 void
 351 General_options::parse_Bsymbolic_functions(const char*, const char*,
 352                                            Command_line*)
 353 {
 354   this->bsymbolic_ = BSYMBOLIC_FUNCTIONS;
 355 }
 356
 357 void
 358 General_options::parse_Bsymbolic(const char*, const char*,
 359                                  Command_line*)
 360 {
 361   this->bsymbolic_ = BSYMBOLIC_ALL;
 362 }
 363
 364 void
 365 General_options::parse_defsym(const char*, const char* arg,
 366                               Command_line* cmdline)
 367 {
 368   cmdline->script_options().define_symbol(arg);
 369 }
 370
 371 void
 372 General_options::parse_discard_all(const char*, const char*,
 373                                    Command_line*)
 374 {
 375   this->discard_locals_ = DISCARD_ALL;
 376 }
 377
 378 void
 379 General_options::parse_discard_locals(const char*, const char*,
 380                                       Command_line*)
 381 {
 382   this->discard_locals_ = DISCARD_LOCALS;
 383 }
 384
 385 void
 386 General_options::parse_discard_none(const char*, const char*,
 387                                     Command_line*)
 388 {
 389   this->discard_locals_ = DISCARD_NONE;
 390 }
 391
 392 void
 393 General_options::parse_incremental(const char*, const char*,
 394                                    Command_line*)
 395 {
 396   this->incremental_mode_ = INCREMENTAL_AUTO;
 397 }
 398
 399 void
 400 General_options::parse_no_incremental(const char*, const char*,
 401                                       Command_line*)
 402 {
 403   this->incremental_mode_ = INCREMENTAL_OFF;
 404 }
 405
 406 void
 407 General_options::parse_incremental_full(const char*, const char*,
 408                                         Command_line*)
 409 {
 410   this->incremental_mode_ = INCREMENTAL_FULL;
 411 }
 412
 413 void
 414 General_options::parse_incremental_update(const char*, const char*,
 415                                           Command_line*)
 416 {
 417   this->incremental_mode_ = INCREMENTAL_UPDATE;
 418 }
 419
 420 void
 421 General_options::parse_incremental_changed(const char*, const char*,
 422                                            Command_line*)
 423 {
 424   this->implicit_incremental_ = true;
 425   this->incremental_disposition_ = INCREMENTAL_CHANGED;
 426 }
 427
 428 void
 429 General_options::parse_incremental_unchanged(const char*, const char*,
 430                                              Command_line*)
 431 {
 432   this->implicit_incremental_ = true;
 433   this->incremental_disposition_ = INCREMENTAL_UNCHANGED;
 434 }
 435
 436 void
 437 General_options::parse_incremental_unknown(const char*, const char*,
 438                                            Command_line*)
 439 {
 440   this->implicit_incremental_ = true;
 441   this->incremental_disposition_ = INCREMENTAL_CHECK;
 442 }
 443
 444 void
 445 General_options::parse_incremental_startup_unchanged(const char*, const char*,
 446                                                      Command_line*)
 447 {
 448   this->implicit_incremental_ = true;
 449   this->incremental_startup_disposition_ = INCREMENTAL_UNCHANGED;
 450 }
 451
 452 void
 453 General_options::parse_library(const char*, const char* arg,
 454                                Command_line* cmdline)
 455 {
 456   Input_file_argument::Input_file_type type;
 457   const char* name;
 458   if (arg[0] == ':')
 459     {
 460       type = Input_file_argument::INPUT_FILE_TYPE_SEARCHED_FILE;
 461       name = arg + 1;
 462     }
 463   else
 464     {
 465       type = Input_file_argument::INPUT_FILE_TYPE_LIBRARY;
 466       name = arg;
 467     }
 468   Input_file_argument file(name, type, "", false, *this);
 469   cmdline->inputs().add_file(file);
 470 }
 471
 472 void
 473 General_options::parse_plugin(const char*, const char* arg,
 474                               Command_line*)
 475 {
 476   this->add_plugin(arg);
 477 }
 478
 479 // Parse --plugin-opt.
 480
 481 void
 482 General_options::parse_plugin_opt(const char*, const char* arg,
 483                                   Command_line*)
 484 {
 485   this->add_plugin_option(arg);
 486 }
 487
 488 void
 489 General_options::parse_no_power10_stubs(const char*, const char*,
 490                                         Command_line*)
 491 {
 492   this->set_power10_stubs("no");
 493   this->set_user_set_power10_stubs();
 494 }
 495
 496 void
 497 General_options::parse_R(const char* option, const char* arg,
 498                          Command_line* cmdline)
 499 {
 500   struct stat s;
 501   if (::stat(arg, &s) != 0 || S_ISDIR(s.st_mode))
 502     this->add_to_rpath(arg);
 503   else
 504     this->parse_just_symbols(option, arg, cmdline);
 505 }
 506
 507 void
 508 General_options::parse_just_symbols(const char*, const char* arg,
 509                                     Command_line* cmdline)
 510 {
 511   Input_file_argument file(arg, Input_file_argument::INPUT_FILE_TYPE_FILE,
 512                            "", true, *this);
 513   cmdline->inputs().add_file(file);
 514 }
 515
 516 // Handle --section-start.
 517
 518 void
 519 General_options::parse_section_start(const char*, const char* arg,
 520                                      Command_line*)
 521 {
 522   const char* eq = strchr(arg, '=');
 523   if (eq == NULL)
 524     {
 525       gold_error(_("invalid argument to --section-start; "
 526                    "must be SECTION=ADDRESS"));
 527       return;
 528     }
 529
 530   std::string section_name(arg, eq - arg);
 531
 532   ++eq;
 533   const char* val_start = eq;
 534   if (eq[0] == '0' && (eq[1] == 'x' || eq[1] == 'X'))
 535     eq += 2;
 536   if (*eq == '\0')
 537     {
 538       gold_error(_("--section-start address missing"));
 539       return;
 540     }
 541   uint64_t addr = 0;
 542   hex_init();
 543   for (; *eq != '\0'; ++eq)
 544     {
 545       if (!hex_p(*eq))
 546         {
 547           gold_error(_("--section-start argument %s is not a valid hex number"),
 548                      val_start);
 549           return;
 550         }
 551       addr <<= 4;
 552       addr += hex_value(*eq);
 553     }
 554
 555   this->section_starts_[section_name] = addr;
 556 }
 557
 558 // Look up a --section-start value.
 559
 560 bool
 561 General_options::section_start(const char* secname, uint64_t* paddr) const
 562 {
 563   if (this->section_starts_.empty())
 564     return false;
 565   std::map<std::string, uint64_t>::const_iterator p =
 566     this->section_starts_.find(secname);
 567   if (p == this->section_starts_.end())
 568     return false;
 569   *paddr = p->second;
 570   return true;
 571 }
 572
 573 void
 574 General_options::parse_static(const char*, const char*, Command_line*)
 575 {
 576   this->set_static(true);
 577 }
 578
 579 void
 580 General_options::parse_script(const char*, const char* arg,
 581                               Command_line* cmdline)
 582 {
 583   if (!read_commandline_script(arg, cmdline))
 584     gold::gold_fatal(_("unable to parse script file %s"), arg);
 585 }
 586
 587 void
 588 General_options::parse_version_script(const char*, const char* arg,
 589                                       Command_line* cmdline)
 590 {
 591   if (!read_version_script(arg, cmdline))
 592     gold::gold_fatal(_("unable to parse version script file %s"), arg);
 593 }
 594
 595 void
 596 General_options::parse_dynamic_list(const char*, const char* arg,
 597                                     Command_line* cmdline)
 598 {
 599   if (!read_dynamic_list(arg, cmdline, &this->dynamic_list_))
 600     gold::gold_fatal(_("unable to parse dynamic-list script file %s"), arg);
 601   this->have_dynamic_list_ = true;
 602 }
 603
 604 void
 605 General_options::parse_start_group(const char*, const char*,
 606                                    Command_line* cmdline)
 607 {
 608   cmdline->inputs().start_group();
 609 }
 610
 611 void
 612 General_options::parse_end_group(const char*, const char*,
 613                                  Command_line* cmdline)
 614 {
 615   cmdline->inputs().end_group();
 616 }
 617
 618 void
 619 General_options::parse_start_lib(const char*, const char*,
 620                                  Command_line* cmdline)
 621 {
 622   cmdline->inputs().start_lib(cmdline->position_dependent_options());
 623 }
 624
 625 void
 626 General_options::parse_end_lib(const char*, const char*,
 627                                Command_line* cmdline)
 628 {
 629   cmdline->inputs().end_lib();
 630 }
 631
 632 // The function add_excluded_libs() in ld/ldlang.c of GNU ld breaks up a list
 633 // of names separated by commas or colons and puts them in a linked list.
 634 // We implement the same parsing of names here but store names in an unordered
 635 // map to speed up searching of names.
 636
 637 void
 638 General_options::parse_exclude_libs(const char*, const char* arg,
 639                                     Command_line*)
 640 {
 641   const char* p = arg;
 642
 643   while (*p != '\0')
 644     {
 645       size_t length = strcspn(p, ",:");
 646       this->excluded_libs_.insert(std::string(p, length));
 647       p += (p[length] ? length + 1 : length);
 648     }
 649 }
 650
 651 // The checking logic is based on the function check_excluded_libs() in
 652 // ld/ldlang.c of GNU ld but our implementation is different because we use
 653 // an unordered map instead of a linked list, which is what GNU ld uses.  GNU
 654 // ld searches sequentially in the excluded libs list.  For a given archive,
 655 // a match is found if the archive's name matches exactly one of the list
 656 // entry or if the archive's name is of the form FOO.a and FOO matches exactly
 657 // one of the list entry.  An entry "ALL" in the list is considered as a
 658 // wild-card and matches any given name.
 659
 660 bool
 661 General_options::check_excluded_libs(const std::string &name) const
 662 {
 663   Unordered_set<std::string>::const_iterator p;
 664
 665   // Exit early for the most common case.
 666   if (excluded_libs_.empty())
 667     return false;
 668
 669   // If we see "ALL", all archives are excluded from automatic export.
 670   p = excluded_libs_.find(std::string("ALL"));
 671   if (p != excluded_libs_.end())
 672     return true;
 673
 674   // First strip off any directories in name.
 675   const char* basename = lbasename(name.c_str());
 676
 677   // Try finding an exact match.
 678   p = excluded_libs_.find(std::string(basename));
 679   if (p != excluded_libs_.end())
 680     return true;
 681
 682   // Try matching NAME without ".a" at the end.
 683   size_t length = strlen(basename);
 684   if ((length >= 2)
 685       && (basename[length - 2] == '.')
 686       && (basename[length - 1] == 'a'))
 687     {
 688       p = excluded_libs_.find(std::string(basename, length - 2));
 689       if (p != excluded_libs_.end())
 690         return true;
 691     }
 692
 693   return false;
 694 }
 695
 696 // Recognize input and output target names.  The GNU linker accepts
 697 // these with --format and --oformat.  This code is intended to be
 698 // minimally compatible.  In practice for an ELF target this would be
 699 // the same target as the input files; that name always start with
 700 // "elf".  Non-ELF targets would be "srec", "symbolsrec", "tekhex",
 701 // "binary", "ihex".
 702
 703 General_options::Object_format
 704 General_options::string_to_object_format(const char* arg)
 705 {
 706   if (strncmp(arg, "elf", 3) == 0 || strcmp(arg, "default") == 0)
 707     return gold::General_options::OBJECT_FORMAT_ELF;
 708   else if (strcmp(arg, "binary") == 0)
 709     return gold::General_options::OBJECT_FORMAT_BINARY;
 710   else
 711     {
 712       gold::gold_error(_("format '%s' not supported; treating as elf "
 713                          "(supported formats: elf, binary)"),
 714                        arg);
 715       return gold::General_options::OBJECT_FORMAT_ELF;
 716     }
 717 }
 718
 719 const char*
 720 General_options::object_format_to_string(General_options::Object_format fmt)
 721 {
 722   switch (fmt)
 723     {
 724     case General_options::OBJECT_FORMAT_ELF:
 725       return "elf";
 726     case General_options::OBJECT_FORMAT_BINARY:
 727       return "binary";
 728     default:
 729       gold_unreachable();
 730     }
 731 }
 732
 733 void
 734 General_options::parse_fix_v4bx(const char*, const char*,
 735                                 Command_line*)
 736 {
 737   this->fix_v4bx_ = FIX_V4BX_REPLACE;
 738 }
 739
 740 void
 741 General_options::parse_fix_v4bx_interworking(const char*, const char*,
 742                                              Command_line*)
 743 {
 744   this->fix_v4bx_ = FIX_V4BX_INTERWORKING;
 745 }
 746
 747 void
 748 General_options::parse_EB(const char*, const char*, Command_line*)
 749 {
 750   this->endianness_ = ENDIANNESS_BIG;
 751 }
 752
 753 void
 754 General_options::parse_EL(const char*, const char*, Command_line*)
 755 {
 756   this->endianness_ = ENDIANNESS_LITTLE;
 757 }
 758
 759 void
 760 General_options::copy_from_posdep_options(
 761     const Position_dependent_options& posdep)
 762 {
 763   this->set_as_needed(posdep.as_needed());
 764   this->set_Bdynamic(posdep.Bdynamic());
 765   this->set_format(
 766       General_options::object_format_to_string(posdep.format_enum()));
 767   this->set_whole_archive(posdep.whole_archive());
 768   this->set_incremental_disposition(posdep.incremental_disposition());
 769 }
 770
 771 void
 772 General_options::parse_push_state(const char*, const char*, Command_line*)
 773 {
 774   Position_dependent_options* posdep = new Position_dependent_options(*this);
 775   this->options_stack_.push_back(posdep);
 776 }
 777
 778 void
 779 General_options::parse_pop_state(const char*, const char*, Command_line*)
 780 {
 781   if (this->options_stack_.empty())
 782     {
 783       gold::gold_error(_("unbalanced --push-state/--pop-state"));
 784       return;
 785     }
 786   Position_dependent_options* posdep = this->options_stack_.back();
 787   this->options_stack_.pop_back();
 788   this->copy_from_posdep_options(*posdep);
 789   delete posdep;
 790 }
 791
 792 } // End namespace gold.
 793
 794 namespace
 795 {
 796
 797 void
 798 usage()
 799 {
 800   fprintf(stderr,
 801           _("%s: use the --help option for usage information\n"),
 802           gold::program_name);
 803   ::exit(EXIT_FAILURE);
 804 }
 805
 806 void
 807 usage(const char* msg, const char* opt)
 808 {
 809   fprintf(stderr,
 810           _("%s: %s: %s\n"),
 811           gold::program_name, opt, msg);
 812   usage();
 813 }
 814
 815 // If the default sysroot is relocatable, try relocating it based on
 816 // the prefix FROM.
 817
 818 static char*
 819 get_relative_sysroot(const char* from)
 820 {
 821   char* path = make_relative_prefix(gold::program_name, from,
 822                                     TARGET_SYSTEM_ROOT);
 823   if (path != NULL)
 824     {
 825       struct stat s;
 826       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 827         return path;
 828       free(path);
 829     }
 830
 831   return NULL;
 832 }
 833
 834 // Return the default sysroot.  This is set by the --with-sysroot
 835 // option to configure.  Note we do not free the return value of
 836 // get_relative_sysroot, which is a small memory leak, but is
 837 // necessary since we store this pointer directly in General_options.
 838
 839 static const char*
 840 get_default_sysroot()
 841 {
 842   const char* sysroot = TARGET_SYSTEM_ROOT;
 843   if (*sysroot == '\0')
 844     return NULL;
 845
 846   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 847     {
 848       char* path = get_relative_sysroot(BINDIR);
 849       if (path == NULL)
 850         path = get_relative_sysroot(TOOLBINDIR);
 851       if (path != NULL)
 852         return path;
 853     }
 854
 855   return sysroot;
 856 }
 857
 858 // Parse a long option.  Such options have the form
 859 // <-|--><option>[=arg].  If "=arg" is not present but the option
 860 // takes an argument, the next word is taken to the be the argument.
 861 // If equals_only is set, then only the <option>=<arg> form is
 862 // accepted, not the <option><space><arg> form.  Returns a One_option
 863 // struct or NULL if argv[i] cannot be parsed as a long option.  In
 864 // the not-NULL case, *arg is set to the option's argument (NULL if
 865 // the option takes no argument), and *i is advanced past this option.
 866 // NOTE: it is safe for argv and arg to point to the same place.
 867 gold::options::One_option*
 868 parse_long_option(int argc, const char** argv, bool equals_only,
 869                   const char** arg, int* i)
 870 {
 871   const char* const this_argv = argv[*i];
 872
 873   const char* equals = strchr(this_argv, '=');
 874   const char* option_start = this_argv + strspn(this_argv, "-");
 875   std::string option(option_start,
 876                      equals ? equals - option_start : strlen(option_start));
 877
 878   gold::options::Option_map::iterator it
 879       = gold::options::long_options->find(option);
 880   if (it == gold::options::long_options->end())
 881     return NULL;
 882
 883   gold::options::One_option* retval = it->second;
 884
 885   // If the dash-count doesn't match, we fail.
 886   if (this_argv[0] != '-')  // no dashes at all: had better be "-z <longopt>"
 887     {
 888       if (retval->dashes != gold::options::DASH_Z)
 889         return NULL;
 890     }
 891   else if (this_argv[1] != '-')   // one dash
 892     {
 893       if (retval->dashes != gold::options::ONE_DASH
 894           && retval->dashes != gold::options::EXACTLY_ONE_DASH
 895           && retval->dashes != gold::options::TWO_DASHES)
 896         return NULL;
 897     }
 898   else                            // two dashes (or more!)
 899     {
 900       if (retval->dashes != gold::options::TWO_DASHES
 901           && retval->dashes != gold::options::EXACTLY_TWO_DASHES
 902           && retval->dashes != gold::options::ONE_DASH)
 903         return NULL;
 904     }
 905
 906   // Now that we know the option is good (or else bad in a way that
 907   // will cause us to die), increment i to point past this argv.
 908   ++(*i);
 909
 910   // Figure out the option's argument, if any.
 911   if (!retval->takes_argument())
 912     {
 913       if (equals)
 914         usage(_("unexpected argument"), this_argv);
 915       else
 916         *arg = NULL;
 917     }
 918   else
 919     {
 920       if (equals)
 921         *arg = equals + 1;
 922       else if (retval->takes_optional_argument())
 923         *arg = retval->default_value;
 924       else if (*i < argc && !equals_only)
 925         *arg = argv[(*i)++];
 926       else
 927         usage(_("missing argument"), this_argv);
 928     }
 929
 930   return retval;
 931 }
 932
 933 // Parse a short option.  Such options have the form -<option>[arg].
 934 // If "arg" is not present but the option takes an argument, the next
 935 // word is taken to the be the argument.  If the option does not take
 936 // an argument, it may be followed by another short option.  Returns a
 937 // One_option struct or NULL if argv[i] cannot be parsed as a short
 938 // option.  In the not-NULL case, *arg is set to the option's argument
 939 // (NULL if the option takes no argument), and *i is advanced past
 940 // this option.  This function keeps *i the same if we parsed a short
 941 // option that does not take an argument, that looks to be followed by
 942 // another short option in the same word.
 943 gold::options::One_option*
 944 parse_short_option(int argc, const char** argv, int pos_in_argv_i,
 945                    const char** arg, int* i)
 946 {
 947   const char* const this_argv = argv[*i];
 948
 949   if (this_argv[0] != '-')
 950     return NULL;
 951
 952   // We handle -z as a special case.
 953   static gold::options::One_option dash_z("", gold::options::DASH_Z,
 954                                           'z', "", NULL, "Z-OPTION", false,
 955                                           NULL, false);
 956   gold::options::One_option* retval = NULL;
 957   if (this_argv[pos_in_argv_i] == 'z')
 958     retval = &dash_z;
 959   else
 960     {
 961       const int char_as_int = static_cast<int>(this_argv[pos_in_argv_i]);
 962       if (char_as_int > 0 && char_as_int < 128)
 963         retval = gold::options::short_options[char_as_int];
 964     }
 965
 966   if (retval == NULL)
 967     return NULL;
 968
 969   // Figure out the option's argument, if any.
 970   if (!retval->takes_argument())
 971     {
 972       *arg = NULL;
 973       // We only advance past this argument if it's the only one in argv.
 974       if (this_argv[pos_in_argv_i + 1] == '\0')
 975         ++(*i);
 976     }
 977   else
 978     {
 979       // If we take an argument, we'll eat up this entire argv entry.
 980       ++(*i);
 981       if (this_argv[pos_in_argv_i + 1] != '\0')
 982         *arg = this_argv + pos_in_argv_i + 1;
 983       else if (retval->takes_optional_argument())
 984         *arg = retval->default_value;
 985       else if (*i < argc)
 986         *arg = argv[(*i)++];
 987       else
 988         usage(_("missing argument"), this_argv);
 989     }
 990
 991   // If we're a -z option, we need to parse our argument as a
 992   // long-option, e.g. "-z stacksize=8192".
 993   if (retval == &dash_z)
 994     {
 995       int dummy_i = 0;
 996       const char* dash_z_arg = *arg;
 997       retval = parse_long_option(1, arg, true, arg, &dummy_i);
 998       if (retval == NULL)
 999         usage(_("unknown -z option"), dash_z_arg);
1000     }
1001
1002   return retval;
1003 }
1004
1005 } // End anonymous namespace.
1006
1007 namespace gold
1008 {
1009
1010 General_options::General_options()
1011   : bsymbolic_(BSYMBOLIC_NONE),
1012     printed_version_(false),
1013     execstack_status_(EXECSTACK_FROM_INPUT),
1014     icf_status_(ICF_NONE),
1015     static_(false),
1016     do_demangle_(false),
1017     plugins_(NULL),
1018     dynamic_list_(),
1019     have_dynamic_list_(false),
1020     incremental_mode_(INCREMENTAL_OFF),
1021     incremental_disposition_(INCREMENTAL_STARTUP),
1022     incremental_startup_disposition_(INCREMENTAL_CHECK),
1023     implicit_incremental_(false),
1024     excluded_libs_(),
1025     symbols_to_retain_(),
1026     section_starts_(),
1027     fix_v4bx_(FIX_V4BX_NONE),
1028     endianness_(ENDIANNESS_NOT_SET),
1029     discard_locals_(DISCARD_SEC_MERGE),
1030     orphan_handling_enum_(ORPHAN_PLACE),
1031     start_stop_visibility_enum_(elfcpp::STV_PROTECTED)
1032 {
1033   // Turn off option registration once construction is complete.
1034   gold::options::ready_to_register = false;
1035 }
1036
1037 General_options::Object_format
1038 General_options::format_enum() const
1039 {
1040   return General_options::string_to_object_format(this->format());
1041 }
1042
1043 General_options::Object_format
1044 General_options::oformat_enum() const
1045 {
1046   return General_options::string_to_object_format(this->oformat());
1047 }
1048
1049 // Add the sysroot, if any, to the search paths.
1050
1051 void
1052 General_options::add_sysroot()
1053 {
1054   if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1055     {
1056       this->set_sysroot(get_default_sysroot());
1057       if (this->sysroot() == NULL || this->sysroot()[0] == '\0')
1058         return;
1059     }
1060
1061   char* canonical_sysroot = lrealpath(this->sysroot());
1062
1063   for (Dir_list::iterator p = this->library_path_.value.begin();
1064        p != this->library_path_.value.end();
1065        ++p)
1066     p->add_sysroot(this->sysroot(), canonical_sysroot);
1067
1068   free(canonical_sysroot);
1069 }
1070
1071 // Return whether FILENAME is in a system directory.
1072
1073 bool
1074 General_options::is_in_system_directory(const std::string& filename) const
1075 {
1076   for (Dir_list::const_iterator p = this->library_path_.value.begin();
1077        p != this->library_path_.value.end();
1078        ++p)
1079     {
1080       // We use a straight string comparison rather than calling
1081       // FILENAME_CMP because we are only interested in the cases
1082       // where we found the file in a system directory, which means
1083       // that we used the directory name as a prefix for a -L search.
1084       if (p->is_system_directory()
1085           && filename.compare(0, p->name().size(), p->name()) == 0)
1086         return true;
1087     }
1088   return false;
1089 }
1090
1091 // Add a plugin to the list of plugins.
1092
1093 void
1094 General_options::add_plugin(const char* filename)
1095 {
1096   if (this->plugins_ == NULL)
1097     this->plugins_ = new Plugin_manager(*this);
1098   this->plugins_->add_plugin(filename);
1099 }
1100
1101 // Add a plugin option to a plugin.
1102
1103 void
1104 General_options::add_plugin_option(const char* arg)
1105 {
1106   if (this->plugins_ == NULL)
1107     gold_fatal("--plugin-opt requires --plugin.");
1108   this->plugins_->add_plugin_option(arg);
1109 }
1110
1111 // Set up variables and other state that isn't set up automatically by
1112 // the parse routine, and ensure options don't contradict each other
1113 // and are otherwise kosher.
1114
1115 void
1116 General_options::finalize()
1117 {
1118   // Normalize the strip modifiers.  They have a total order:
1119   // strip_all > strip_debug > strip_non_line > strip_debug_gdb.
1120   // If one is true, set all beneath it to true as well.
1121   if (this->strip_all())
1122     this->set_strip_debug(true);
1123   if (this->strip_debug())
1124     this->set_strip_debug_non_line(true);
1125   if (this->strip_debug_non_line())
1126     this->set_strip_debug_gdb(true);
1127
1128   if (this->Bshareable())
1129     this->set_shared(true);
1130
1131   // If the user specifies both -s and -r, convert the -s to -S.
1132   // -r requires us to keep externally visible symbols!
1133   if (this->strip_all() && this->relocatable())
1134     {
1135       this->set_strip_all(false);
1136       gold_assert(this->strip_debug());
1137     }
1138
1139   // For us, -dc and -dp are synonyms for --define-common.
1140   if (this->dc())
1141     this->set_define_common(true);
1142   if (this->dp())
1143     this->set_define_common(true);
1144
1145   // We also set --define-common if we're not relocatable, as long as
1146   // the user didn't explicitly ask for something different.
1147   if (!this->user_set_define_common())
1148     this->set_define_common(!this->relocatable());
1149
1150   // execstack_status_ is a three-state variable; update it based on
1151   // -z [no]execstack.
1152   if (this->execstack())
1153     this->set_execstack_status(EXECSTACK_YES);
1154   else if (this->noexecstack())
1155     this->set_execstack_status(EXECSTACK_NO);
1156
1157   // icf_status_ is a three-state variable; update it based on the
1158   // value of this->icf().
1159   if (strcmp(this->icf(), "none") == 0)
1160     this->set_icf_status(ICF_NONE);
1161   else if (strcmp(this->icf(), "safe") == 0)
1162     this->set_icf_status(ICF_SAFE);
1163   else
1164     this->set_icf_status(ICF_ALL);
1165
1166   // Handle the optional argument for --demangle.
1167   if (this->user_set_demangle())
1168     {
1169       this->set_do_demangle(true);
1170       const char* style = this->demangle();
1171       if (*style != '\0')
1172         {
1173           enum demangling_styles style_code;
1174
1175           style_code = cplus_demangle_name_to_style(style);
1176           if (style_code == unknown_demangling)
1177             gold_fatal("unknown demangling style '%s'", style);
1178           cplus_demangle_set_style(style_code);
1179         }
1180     }
1181   else if (this->user_set_no_demangle())
1182     this->set_do_demangle(false);
1183   else
1184     {
1185       // Testing COLLECT_NO_DEMANGLE makes our default demangling
1186       // behaviour identical to that of gcc's linker wrapper.
1187       this->set_do_demangle(getenv("COLLECT_NO_DEMANGLE") == NULL);
1188     }
1189
1190   // Parse the --orphan-handling argument.
1191   if (this->user_set_orphan_handling())
1192     {
1193       if (strcmp(this->orphan_handling(), "place") == 0)
1194         this->set_orphan_handling_enum(ORPHAN_PLACE);
1195       else if (strcmp(this->orphan_handling(), "discard") == 0)
1196         this->set_orphan_handling_enum(ORPHAN_DISCARD);
1197       else if (strcmp(this->orphan_handling(), "warn") == 0)
1198         this->set_orphan_handling_enum(ORPHAN_WARN);
1199       else if (strcmp(this->orphan_handling(), "error") == 0)
1200         this->set_orphan_handling_enum(ORPHAN_ERROR);
1201     }
1202
1203   // Parse the -z start-stop-visibility argument.
1204   if (this->user_set_start_stop_visibility())
1205     {
1206       if (strcmp(this->start_stop_visibility(), "default") == 0)
1207         this->set_start_stop_visibility_enum(elfcpp::STV_DEFAULT);
1208       else if (strcmp(this->start_stop_visibility(), "internal") == 0)
1209         this->set_start_stop_visibility_enum(elfcpp::STV_INTERNAL);
1210       else if (strcmp(this->start_stop_visibility(), "hidden") == 0)
1211         this->set_start_stop_visibility_enum(elfcpp::STV_HIDDEN);
1212       else if (strcmp(this->start_stop_visibility(), "protected") == 0)
1213         this->set_start_stop_visibility_enum(elfcpp::STV_PROTECTED);
1214     }
1215
1216   // Parse the --power10-stubs argument.
1217   if (!this->user_set_power10_stubs())
1218     {
1219       // --power10-stubs without an arg is equivalent to --power10-stubs=yes
1220       // but not specifying --power10-stubs at all should be equivalent to
1221       // --power10-stubs=auto.  This doesn't fit into the notion of
1222       // "default_value", used both as a static initializer and to provide
1223       // a missing optional arg.  Fix it here.
1224       this->set_power10_stubs("auto");
1225       this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
1226     }
1227   else
1228     {
1229       if (strcmp(this->power10_stubs(), "auto") == 0)
1230         this->set_power10_stubs_enum(POWER10_STUBS_AUTO);
1231       else if (strcmp(this->power10_stubs(), "no") == 0)
1232         this->set_power10_stubs_enum(POWER10_STUBS_NO);
1233       else if (strcmp(this->power10_stubs(), "yes") == 0)
1234         this->set_power10_stubs_enum(POWER10_STUBS_YES);
1235     }
1236
1237   // -M is equivalent to "-Map -".
1238   if (this->print_map() && !this->user_set_Map())
1239     {
1240       this->set_Map("-");
1241       this->set_user_set_Map();
1242     }
1243
1244   // Using -n or -N implies -static.
1245   if (this->nmagic() || this->omagic())
1246     this->set_static(true);
1247
1248   // If --thread_count is specified, it applies to
1249   // --thread-count-{initial,middle,final}, though it doesn't override
1250   // them.
1251   if (this->thread_count() > 0 && this->thread_count_initial() == 0)
1252     this->set_thread_count_initial(this->thread_count());
1253   if (this->thread_count() > 0 && this->thread_count_middle() == 0)
1254     this->set_thread_count_middle(this->thread_count());
1255   if (this->thread_count() > 0 && this->thread_count_final() == 0)
1256     this->set_thread_count_final(this->thread_count());
1257
1258   // Let's warn if you set the thread-count but we're going to ignore it.
1259 #ifndef ENABLE_THREADS
1260   if (this->threads())
1261     {
1262       gold_warning(_("ignoring --threads: "
1263                      "%s was compiled without thread support"),
1264                    program_name);
1265       this->set_threads(false);
1266     }
1267   if (this->thread_count() > 0 || this->thread_count_initial() > 0
1268       || this->thread_count_middle() > 0 || this->thread_count_final() > 0)
1269     gold_warning(_("ignoring --thread-count: "
1270                    "%s was compiled without thread support"),
1271                  program_name);
1272 #endif
1273
1274 #ifndef ENABLE_PLUGINS
1275   if (this->has_plugins())
1276     gold_fatal(_("cannot use --plugin: "
1277                  "%s was compiled without plugin support"),
1278                program_name);
1279 #endif
1280
1281   std::string libpath;
1282   if (this->user_set_Y())
1283     {
1284       libpath = this->Y();
1285       if (libpath.compare(0, 2, "P,") == 0)
1286         libpath.erase(0, 2);
1287     }
1288   else if (!this->nostdlib())
1289     {
1290 #ifndef NATIVE_LINKER
1291 #define NATIVE_LINKER 0
1292 #endif
1293       const char* p = LIB_PATH;
1294       if (strcmp(p, "::DEFAULT::") != 0)
1295         libpath = p;
1296       else if (NATIVE_LINKER
1297                || this->user_set_sysroot()
1298                || *TARGET_SYSTEM_ROOT != '\0')
1299         {
1300           this->add_to_library_path_with_sysroot("/lib");
1301           this->add_to_library_path_with_sysroot("/usr/lib");
1302         }
1303       else
1304         this->add_to_library_path_with_sysroot(TOOLLIBDIR);
1305     }
1306
1307   if (!libpath.empty())
1308     {
1309       size_t pos = 0;
1310       size_t next_pos;
1311       do
1312         {
1313           next_pos = libpath.find(':', pos);
1314           size_t len = (next_pos == std::string::npos
1315                         ? next_pos
1316                         : next_pos - pos);
1317           if (len != 0)
1318             this->add_to_library_path_with_sysroot(libpath.substr(pos, len));
1319           pos = next_pos + 1;
1320         }
1321       while (next_pos != std::string::npos);
1322     }
1323
1324   // Parse the contents of -retain-symbols-file into a set.
1325   if (this->retain_symbols_file())
1326     {
1327       std::ifstream in;
1328       in.open(this->retain_symbols_file());
1329       if (!in)
1330         gold_fatal(_("unable to open -retain-symbols-file file %s: %s"),
1331                    this->retain_symbols_file(), strerror(errno));
1332       std::string line;
1333       std::getline(in, line);   // this chops off the trailing \n, if any
1334       while (in)
1335         {
1336           if (!line.empty() && line[line.length() - 1] == '\r')   // Windows
1337             line.resize(line.length() - 1);
1338           this->symbols_to_retain_.insert(line);
1339           std::getline(in, line);
1340         }
1341     }
1342
1343   // -Bgroup implies --unresolved-symbols=report-all.
1344   if (this->Bgroup() && !this->user_set_unresolved_symbols())
1345     this->set_unresolved_symbols("report-all");
1346
1347   // -shared implies --allow-shlib-undefined.  Currently
1348   // ---allow-shlib-undefined controls warnings issued based on the
1349   // -symbol table.  --unresolved-symbols controls warnings issued
1350   // -based on relocations.
1351   if (this->shared() && !this->user_set_allow_shlib_undefined())
1352     this->set_allow_shlib_undefined(true);
1353
1354   // Normalize library_path() by adding the sysroot to all directories
1355   // in the path, as appropriate.
1356   this->add_sysroot();
1357
1358   // Now that we've normalized the options, check for contradictory ones.
1359   if (this->shared() && this->is_static())
1360     gold_fatal(_("-shared and -static are incompatible"));
1361   if (this->shared() && this->pie())
1362     gold_fatal(_("-shared and -pie are incompatible"));
1363   if (this->pie() && this->is_static())
1364     gold_fatal(_("-pie and -static are incompatible"));
1365
1366   if (this->shared() && this->relocatable())
1367     gold_fatal(_("-shared and -r are incompatible"));
1368   if (this->pie() && this->relocatable())
1369     gold_fatal(_("-pie and -r are incompatible"));
1370
1371   if (!this->shared())
1372     {
1373       if (this->filter() != NULL)
1374         gold_fatal(_("-F/--filter may not used without -shared"));
1375       if (this->any_auxiliary())
1376         gold_fatal(_("-f/--auxiliary may not be used without -shared"));
1377     }
1378
1379   // TODO: implement support for -retain-symbols-file with -r, if needed.
1380   if (this->relocatable() && this->retain_symbols_file())
1381     gold_fatal(_("-retain-symbols-file does not yet work with -r"));
1382
1383   if (this->oformat_enum() != General_options::OBJECT_FORMAT_ELF
1384       && (this->shared()
1385           || this->pie()
1386           || this->relocatable()))
1387     gold_fatal(_("binary output format not compatible "
1388                  "with -shared or -pie or -r"));
1389
1390   if (this->user_set_hash_bucket_empty_fraction()
1391       && (this->hash_bucket_empty_fraction() < 0.0
1392           || this->hash_bucket_empty_fraction() >= 1.0))
1393     gold_fatal(_("--hash-bucket-empty-fraction value %g out of range "
1394                  "[0.0, 1.0)"),
1395                this->hash_bucket_empty_fraction());
1396
1397   if (this->implicit_incremental_ && this->incremental_mode_ == INCREMENTAL_OFF)
1398     gold_fatal(_("Options --incremental-changed, --incremental-unchanged, "
1399                  "--incremental-unknown require the use of --incremental"));
1400
1401   // Check for options that are not compatible with incremental linking.
1402   // Where an option can be disabled without seriously changing the semantics
1403   // of the link, we turn the option off; otherwise, we issue a fatal error.
1404
1405   if (this->incremental_mode_ != INCREMENTAL_OFF)
1406     {
1407       if (this->relocatable())
1408         gold_fatal(_("incremental linking is not compatible with -r"));
1409       if (this->emit_relocs())
1410         gold_fatal(_("incremental linking is not compatible with "
1411                      "--emit-relocs"));
1412       if (this->has_plugins())
1413         gold_fatal(_("incremental linking is not compatible with --plugin"));
1414       if (this->relro())
1415         gold_fatal(_("incremental linking is not compatible with -z relro"));
1416       if (this->pie())
1417         gold_fatal(_("incremental linking is not compatible with -pie"));
1418       if (this->gc_sections())
1419         {
1420           gold_warning(_("ignoring --gc-sections for an incremental link"));
1421           this->set_gc_sections(false);
1422         }
1423       if (this->icf_enabled())
1424         {
1425           gold_warning(_("ignoring --icf for an incremental link"));
1426           this->set_icf_status(ICF_NONE);
1427         }
1428       if (strcmp(this->compress_debug_sections(), "none") != 0)
1429         {
1430           gold_warning(_("ignoring --compress-debug-sections for an "
1431                          "incremental link"));
1432           this->set_compress_debug_sections("none");
1433         }
1434     }
1435
1436 #ifndef HAVE_ZSTD
1437   if (strcmp(this->compress_debug_sections(), "zstd") == 0)
1438     {
1439       gold_error(_("--compress-debug-sections=zstd: gold is not built with "
1440                    "zstd support"));
1441       this->set_compress_debug_sections("none");
1442     }
1443 #endif
1444
1445   // --rosegment-gap implies --rosegment.
1446   if (this->user_set_rosegment_gap())
1447     this->set_rosegment(true);
1448
1449   // FIXME: we can/should be doing a lot more sanity checking here.
1450 }
1451
1452 // Search_directory methods.
1453
1454 // This is called if we have a sysroot.  Apply the sysroot if
1455 // appropriate.  Record whether the directory is in the sysroot.
1456
1457 void
1458 Search_directory::add_sysroot(const char* sysroot,
1459                               const char* canonical_sysroot)
1460 {
1461   gold_assert(*sysroot != '\0');
1462   if (this->put_in_sysroot_)
1463     {
1464       if (!IS_DIR_SEPARATOR(this->name_[0])
1465           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
1466         this->name_ = '/' + this->name_;
1467       this->name_ = sysroot + this->name_;
1468       this->is_in_sysroot_ = true;
1469     }
1470   else
1471     {
1472       // Check whether this entry is in the sysroot.  To do this
1473       // correctly, we need to use canonical names.  Otherwise we will
1474       // get confused by the ../../.. paths that gcc tends to use.
1475       char* canonical_name = lrealpath(this->name_.c_str());
1476       int canonical_name_len = strlen(canonical_name);
1477       int canonical_sysroot_len = strlen(canonical_sysroot);
1478       if (canonical_name_len > canonical_sysroot_len
1479           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
1480         {
1481           canonical_name[canonical_sysroot_len] = '\0';
1482           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
1483             this->is_in_sysroot_ = true;
1484         }
1485       free(canonical_name);
1486     }
1487 }
1488
1489 // Input_arguments methods.
1490
1491 // Add a file to the list.
1492
1493 Input_argument&
1494 Input_arguments::add_file(Input_file_argument& file)
1495 {
1496   file.set_arg_serial(++this->file_count_);
1497   if (this->in_group_)
1498     {
1499       gold_assert(!this->input_argument_list_.empty());
1500       gold_assert(this->input_argument_list_.back().is_group());
1501       return this->input_argument_list_.back().group()->add_file(file);
1502     }
1503   if (this->in_lib_)
1504     {
1505       gold_assert(!this->input_argument_list_.empty());
1506       gold_assert(this->input_argument_list_.back().is_lib());
1507       return this->input_argument_list_.back().lib()->add_file(file);
1508     }
1509   this->input_argument_list_.push_back(Input_argument(file));
1510   return this->input_argument_list_.back();
1511 }
1512
1513 // Start a group.
1514
1515 void
1516 Input_arguments::start_group()
1517 {
1518   if (this->in_group_)
1519     gold_fatal(_("May not nest groups"));
1520   if (this->in_lib_)
1521     gold_fatal(_("may not nest groups in libraries"));
1522   Input_file_group* group = new Input_file_group();
1523   this->input_argument_list_.push_back(Input_argument(group));
1524   this->in_group_ = true;
1525 }
1526
1527 // End a group.
1528
1529 void
1530 Input_arguments::end_group()
1531 {
1532   if (!this->in_group_)
1533     gold_fatal(_("Group end without group start"));
1534   this->in_group_ = false;
1535 }
1536
1537 // Start a lib.
1538
1539 void
1540 Input_arguments::start_lib(const Position_dependent_options& options)
1541 {
1542   if (this->in_lib_)
1543     gold_fatal(_("may not nest libraries"));
1544   if (this->in_group_)
1545     gold_fatal(_("may not nest libraries in groups"));
1546   Input_file_lib* lib = new Input_file_lib(options);
1547   this->input_argument_list_.push_back(Input_argument(lib));
1548   this->in_lib_ = true;
1549 }
1550
1551 // End a lib.
1552
1553 void
1554 Input_arguments::end_lib()
1555 {
1556   if (!this->in_lib_)
1557     gold_fatal(_("lib end without lib start"));
1558   this->in_lib_ = false;
1559 }
1560
1561 // Command_line options.
1562
1563 Command_line::Command_line()
1564 {
1565 }
1566
1567 // Pre_options is the hook that sets the ready_to_register flag.
1568
1569 Command_line::Pre_options::Pre_options()
1570 {
1571   gold::options::ready_to_register = true;
1572 }
1573
1574 // Process the command line options.  For process_one_option, i is the
1575 // index of argv to process next, and must be an option (that is,
1576 // start with a dash).  The return value is the index of the next
1577 // option to process (i+1 or i+2, or argc to indicate processing is
1578 // done).  no_more_options is set to true if (and when) "--" is seen
1579 // as an option.
1580
1581 int
1582 Command_line::process_one_option(int argc, const char** argv, int i,
1583                                  bool* no_more_options)
1584 {
1585   gold_assert(argv[i][0] == '-' && !(*no_more_options));
1586
1587   // If we are reading "--", then just set no_more_options and return.
1588   if (argv[i][1] == '-' && argv[i][2] == '\0')
1589     {
1590       *no_more_options = true;
1591       return i + 1;
1592     }
1593
1594   int new_i = i;
1595   options::One_option* option = NULL;
1596   const char* arg = NULL;
1597
1598   // First, try to process argv as a long option.
1599   option = parse_long_option(argc, argv, false, &arg, &new_i);
1600   if (option)
1601     {
1602       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1603       return new_i;
1604     }
1605
1606   // Now, try to process argv as a short option.  Since several short
1607   // options can be combined in one argv, we may have to parse a lot
1608   // until we're done reading this argv.
1609   int pos_in_argv_i = 1;
1610   while (new_i == i)
1611     {
1612       option = parse_short_option(argc, argv, pos_in_argv_i, &arg, &new_i);
1613       if (!option)
1614         break;
1615       option->reader->parse_to_value(argv[i], arg, this, &this->options_);
1616       ++pos_in_argv_i;
1617     }
1618   if (option)
1619     return new_i;
1620
1621   // I guess it's neither a long option nor a short option.
1622   usage(_("unknown option"), argv[i]);
1623   return argc;
1624 }
1625
1626
1627 void
1628 Command_line::process(int argc, const char** argv)
1629 {
1630   bool no_more_options = false;
1631   int i = 0;
1632   while (i < argc)
1633     {
1634       this->position_options_.copy_from_options(this->options());
1635       if (no_more_options || argv[i][0] != '-')
1636         {
1637           Input_file_argument file(argv[i],
1638                                    Input_file_argument::INPUT_FILE_TYPE_FILE,
1639                                    "", false, this->position_options_);
1640           this->inputs_.add_file(file);
1641           ++i;
1642         }
1643       else
1644         i = process_one_option(argc, argv, i, &no_more_options);
1645     }
1646
1647   if (this->inputs_.in_group())
1648     {
1649       fprintf(stderr, _("%s: missing group end\n"), program_name);
1650       usage();
1651     }
1652
1653   if (this->inputs_.in_lib())
1654     {
1655       fprintf(stderr, _("%s: missing lib end\n"), program_name);
1656       usage();
1657     }
1658
1659   // Normalize the options and ensure they don't contradict each other.
1660   this->options_.finalize();
1661 }
1662
1663 // Finalize the version script options and return them.
1664
1665 const Version_script_info&
1666 Command_line::version_script()
1667 {
1668   this->options_.finalize_dynamic_list();
1669   Version_script_info* vsi = this->script_options_.version_script_info();
1670   vsi->finalize();
1671   return *vsi;
1672 }
1673
1674 } // End namespace gold.