1 // options.h -- handle command line options for gold -*- C++ -*- 2 3 // Copyright (C) 2006-2022 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 // General_options (from Command_line::options()) 24 // All the options (a.k.a. command-line flags) 25 // Input_argument (from Command_line::inputs()) 26 // The list of input files, including -l options. 27 // Command_line 28 // Everything we get from the command line -- the General_options 29 // plus the Input_arguments. 30 // 31 // There are also some smaller classes, such as 32 // Position_dependent_options which hold a subset of General_options 33 // that change as options are parsed (as opposed to the usual behavior 34 // of the last instance of that option specified on the commandline wins). 35 36 #ifndef GOLD_OPTIONS_H 37 #define GOLD_OPTIONS_H 38 39 #include <cstdlib> 40 #include <cstring> 41 #include <list> 42 #include <map> 43 #include <string> 44 #include <vector> 45 46 #include "elfcpp.h" 47 #include "script.h" 48 49 namespace gold 50 { 51 52 class Command_line; 53 class General_options; 54 class Search_directory; 55 class Input_file_group; 56 class Input_file_lib; 57 class Position_dependent_options; 58 class Target; 59 class Plugin_manager; 60 class Script_info; 61 62 // Incremental build action for a specific file, as selected by the user. 63 64 enum Incremental_disposition 65 { 66 // Startup files that appear before the first disposition option. 67 // These will default to INCREMENTAL_CHECK unless the 68 // --incremental-startup-unchanged option is given. 69 // (For files added implicitly by gcc before any user options.) 70 INCREMENTAL_STARTUP, 71 // Determine the status from the timestamp (default). 72 INCREMENTAL_CHECK, 73 // Assume the file changed from the previous build. 74 INCREMENTAL_CHANGED, 75 // Assume the file didn't change from the previous build. 76 INCREMENTAL_UNCHANGED 77 }; 78 79 // The nested namespace is to contain all the global variables and 80 // structs that need to be defined in the .h file, but do not need to 81 // be used outside this class. 82 namespace options 83 { 84 typedef std::vector<Search_directory> Dir_list; 85 typedef Unordered_set<std::string> String_set; 86 87 // These routines convert from a string option to various types. 88 // Each gives a fatal error if it cannot parse the argument. 89 90 extern void 91 parse_bool(const char* option_name, const char* arg, bool* retval); 92 93 extern void 94 parse_int(const char* option_name, const char* arg, int* retval); 95 96 extern void 97 parse_uint(const char* option_name, const char* arg, int* retval); 98 99 extern void 100 parse_uint64(const char* option_name, const char* arg, uint64_t* retval); 101 102 extern void 103 parse_double(const char* option_name, const char* arg, double* retval); 104 105 extern void 106 parse_percent(const char* option_name, const char* arg, double* retval); 107 108 extern void 109 parse_string(const char* option_name, const char* arg, const char** retval); 110 111 extern void 112 parse_optional_string(const char* option_name, const char* arg, 113 const char** retval); 114 115 extern void 116 parse_dirlist(const char* option_name, const char* arg, Dir_list* retval); 117 118 extern void 119 parse_set(const char* option_name, const char* arg, String_set* retval); 120 121 extern void 122 parse_choices(const char* option_name, const char* arg, const char** retval, 123 const char* choices[], int num_choices); 124 125 struct Struct_var; 126 127 // Most options have both a shortname (one letter) and a longname. 128 // This enum controls how many dashes are expected for longname access 129 // -- shortnames always use one dash. Most longnames will accept 130 // either one dash or two; the only difference between ONE_DASH and 131 // TWO_DASHES is how we print the option in --help. However, some 132 // longnames require two dashes, and some require only one. The 133 // special value DASH_Z means that the option is preceded by "-z". 134 enum Dashes 135 { 136 ONE_DASH, TWO_DASHES, EXACTLY_ONE_DASH, EXACTLY_TWO_DASHES, DASH_Z 137 }; 138 139 // LONGNAME is the long-name of the option with dashes converted to 140 // underscores, or else the short-name if the option has no long-name. 141 // It is never the empty string. 142 // DASHES is an instance of the Dashes enum: ONE_DASH, TWO_DASHES, etc. 143 // SHORTNAME is the short-name of the option, as a char, or '\0' if the 144 // option has no short-name. If the option has no long-name, you 145 // should specify the short-name in *both* VARNAME and here. 146 // DEFAULT_VALUE is the value of the option if not specified on the 147 // commandline, as a string. 148 // HELPSTRING is the descriptive text used with the option via --help 149 // HELPARG is how you define the argument to the option. 150 // --help output is "-shortname HELPARG, --longname HELPARG: HELPSTRING" 151 // HELPARG should be NULL iff the option is a bool and takes no arg. 152 // OPTIONAL_ARG is true if this option takes an optional argument. An 153 // optional argument must be specifid as --OPTION=VALUE, not 154 // --OPTION VALUE. 155 // READER provides parse_to_value, which is a function that will convert 156 // a char* argument into the proper type and store it in some variable. 157 // IS_DEFAULT is true for boolean options that are on by default, 158 // and thus should have "(default)" printed with the helpstring. 159 // A One_option struct initializes itself with the global list of options 160 // at constructor time, so be careful making one of these. 161 struct One_option 162 { 163 std::string longname; 164 Dashes dashes; 165 char shortname; 166 const char* default_value; 167 const char* helpstring; 168 const char* helparg; 169 bool optional_arg; 170 Struct_var* reader; 171 bool is_default; 172 One_optionOne_option173 One_option(const char* ln, Dashes d, char sn, const char* dv, 174 const char* hs, const char* ha, bool oa, Struct_var* r, 175 bool id) 176 : longname(ln), dashes(d), shortname(sn), default_value(dv ? dv : ""), 177 helpstring(hs), helparg(ha), optional_arg(oa), reader(r), 178 is_default(id) 179 { 180 // In longname, we convert all underscores to dashes, since GNU 181 // style uses dashes in option names. longname is likely to have 182 // underscores in it because it's also used to declare a C++ 183 // function. 184 const char* pos = strchr(this->longname.c_str(), '_'); 185 for (; pos; pos = strchr(pos, '_')) 186 this->longname[pos - this->longname.c_str()] = '-'; 187 188 // We only register ourselves if our helpstring is not NULL. This 189 // is to support the "no-VAR" boolean variables, which we 190 // conditionally turn on by defining "no-VAR" help text. 191 if (this->helpstring) 192 this->register_option(); 193 } 194 195 // This option takes an argument iff helparg is not NULL. 196 bool takes_argumentOne_option197 takes_argument() const 198 { return this->helparg != NULL; } 199 200 // Whether the argument is optional. 201 bool takes_optional_argumentOne_option202 takes_optional_argument() const 203 { return this->optional_arg; } 204 205 // Register this option with the global list of options. 206 void 207 register_option(); 208 209 // Print this option to stdout (used with --help). 210 void 211 print() const; 212 }; 213 214 // All options have a Struct_##varname that inherits from this and 215 // actually implements parse_to_value for that option. 216 struct Struct_var 217 { 218 // OPTION: the name of the option as specified on the commandline, 219 // including leading dashes, and any text following the option: 220 // "-O", "--defsym=mysym=0x1000", etc. 221 // ARG: the arg associated with this option, or NULL if the option 222 // takes no argument: "2", "mysym=0x1000", etc. 223 // CMDLINE: the global Command_line object. Used by DEFINE_special. 224 // OPTIONS: the global General_options object. Used by DEFINE_special. 225 virtual void 226 parse_to_value(const char* option, const char* arg, 227 Command_line* cmdline, General_options* options) = 0; 228 virtual ~Struct_varStruct_var229 ~Struct_var() // To make gcc happy. 230 { } 231 }; 232 233 // This is for "special" options that aren't of any predefined type. 234 struct Struct_special : public Struct_var 235 { 236 // If you change this, change the parse-fn in DEFINE_special as well. 237 typedef void (General_options::*Parse_function)(const char*, const char*, 238 Command_line*); Struct_specialStruct_special239 Struct_special(const char* varname, Dashes dashes, char shortname, 240 Parse_function parse_function, 241 const char* helpstring, const char* helparg) 242 : option(varname, dashes, shortname, "", helpstring, helparg, false, this, 243 false), 244 parse(parse_function) 245 { } 246 parse_to_valueStruct_special247 void parse_to_value(const char* option, const char* arg, 248 Command_line* cmdline, General_options* options) 249 { (options->*(this->parse))(option, arg, cmdline); } 250 251 One_option option; 252 Parse_function parse; 253 }; 254 255 } // End namespace options. 256 257 258 // These are helper macros use by DEFINE_uint64/etc below. 259 // This macro is used inside the General_options_ class, so defines 260 // var() and set_var() as General_options methods. Arguments as are 261 // for the constructor for One_option. param_type__ is the same as 262 // type__ for built-in types, and "const type__ &" otherwise. 263 // 264 // When we define the linker command option "assert", the macro argument 265 // varname__ of DEFINE_var below will be replaced by "assert". On Mac OSX 266 // assert.h is included implicitly by one of the library headers we use. To 267 // avoid unintended macro substitution of "assert()", we need to enclose 268 // varname__ with parenthese. 269 #define DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 270 default_value_as_string__, helpstring__, helparg__, \ 271 optional_arg__, type__, param_type__, parse_fn__, \ 272 is_default__) \ 273 public: \ 274 param_type__ \ 275 (varname__)() const \ 276 { return this->varname__##_.value; } \ 277 \ 278 bool \ 279 user_set_##varname__() const \ 280 { return this->varname__##_.user_set_via_option; } \ 281 \ 282 void \ 283 set_user_set_##varname__() \ 284 { this->varname__##_.user_set_via_option = true; } \ 285 \ 286 static const bool varname__##is_default = is_default__; \ 287 \ 288 private: \ 289 struct Struct_##varname__ : public options::Struct_var \ 290 { \ 291 Struct_##varname__() \ 292 : option(#varname__, dashes__, shortname__, default_value_as_string__, \ 293 helpstring__, helparg__, optional_arg__, this, is_default__), \ 294 user_set_via_option(false), value(default_value__) \ 295 { } \ 296 \ 297 void \ 298 parse_to_value(const char* option_name, const char* arg, \ 299 Command_line*, General_options*) \ 300 { \ 301 parse_fn__(option_name, arg, &this->value); \ 302 this->user_set_via_option = true; \ 303 } \ 304 \ 305 options::One_option option; \ 306 bool user_set_via_option; \ 307 type__ value; \ 308 }; \ 309 Struct_##varname__ varname__##_; \ 310 void \ 311 set_##varname__(param_type__ value) \ 312 { this->varname__##_.value = value; } 313 314 // These macros allow for easy addition of a new commandline option. 315 316 // If no_helpstring__ is not NULL, then in addition to creating 317 // VARNAME, we also create an option called no-VARNAME (or, for a -z 318 // option, noVARNAME). 319 #define DEFINE_bool(varname__, dashes__, shortname__, default_value__, \ 320 helpstring__, no_helpstring__) \ 321 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 322 default_value__ ? "true" : "false", helpstring__, NULL, \ 323 false, bool, bool, options::parse_bool, default_value__) \ 324 struct Struct_no_##varname__ : public options::Struct_var \ 325 { \ 326 Struct_no_##varname__() : option((dashes__ == options::DASH_Z \ 327 ? "no" #varname__ \ 328 : "no-" #varname__), \ 329 dashes__, '\0', \ 330 default_value__ ? "false" : "true", \ 331 no_helpstring__, NULL, false, this, \ 332 !(default_value__)) \ 333 { } \ 334 \ 335 void \ 336 parse_to_value(const char*, const char*, \ 337 Command_line*, General_options* options) \ 338 { \ 339 options->set_##varname__(false); \ 340 options->set_user_set_##varname__(); \ 341 } \ 342 \ 343 options::One_option option; \ 344 }; \ 345 Struct_no_##varname__ no_##varname__##_initializer_ 346 347 #define DEFINE_bool_ignore(varname__, dashes__, shortname__, \ 348 helpstring__, no_helpstring__) \ 349 DEFINE_var(varname__, dashes__, shortname__, false, \ 350 "false", helpstring__, NULL, \ 351 false, bool, bool, options::parse_bool, false) \ 352 struct Struct_no_##varname__ : public options::Struct_var \ 353 { \ 354 Struct_no_##varname__() : option((dashes__ == options::DASH_Z \ 355 ? "no" #varname__ \ 356 : "no-" #varname__), \ 357 dashes__, '\0', \ 358 "false", \ 359 no_helpstring__, NULL, false, this, \ 360 false) \ 361 { } \ 362 \ 363 void \ 364 parse_to_value(const char*, const char*, \ 365 Command_line*, General_options* options) \ 366 { \ 367 options->set_##varname__(false); \ 368 options->set_user_set_##varname__(); \ 369 } \ 370 \ 371 options::One_option option; \ 372 }; \ 373 Struct_no_##varname__ no_##varname__##_initializer_ 374 375 #define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \ 376 helpstring__, no_helpstring__) \ 377 DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \ 378 default_value__ ? "true" : "false", helpstring__, NULL, \ 379 false, bool, bool, options::parse_bool, default_value__) \ 380 struct Struct_disable_##varname__ : public options::Struct_var \ 381 { \ 382 Struct_disable_##varname__() : option("disable-" #varname__, \ 383 dashes__, '\0', \ 384 default_value__ ? "false" : "true", \ 385 no_helpstring__, NULL, false, this, \ 386 !default_value__) \ 387 { } \ 388 \ 389 void \ 390 parse_to_value(const char*, const char*, \ 391 Command_line*, General_options* options) \ 392 { options->set_enable_##varname__(false); } \ 393 \ 394 options::One_option option; \ 395 }; \ 396 Struct_disable_##varname__ disable_##varname__##_initializer_ 397 398 #define DEFINE_int(varname__, dashes__, shortname__, default_value__, \ 399 helpstring__, helparg__) \ 400 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 401 #default_value__, helpstring__, helparg__, false, \ 402 int, int, options::parse_int, false) 403 404 #define DEFINE_uint(varname__, dashes__, shortname__, default_value__, \ 405 helpstring__, helparg__) \ 406 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 407 #default_value__, helpstring__, helparg__, false, \ 408 int, int, options::parse_uint, false) 409 410 #define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \ 411 helpstring__, helparg__) \ 412 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 413 #default_value__, helpstring__, helparg__, false, \ 414 uint64_t, uint64_t, options::parse_uint64, false) 415 416 #define DEFINE_double(varname__, dashes__, shortname__, default_value__, \ 417 helpstring__, helparg__) \ 418 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 419 #default_value__, helpstring__, helparg__, false, \ 420 double, double, options::parse_double, false) 421 422 #define DEFINE_percent(varname__, dashes__, shortname__, default_value__, \ 423 helpstring__, helparg__) \ 424 DEFINE_var(varname__, dashes__, shortname__, default_value__ / 100.0, \ 425 #default_value__, helpstring__, helparg__, false, \ 426 double, double, options::parse_percent, false) 427 428 #define DEFINE_string(varname__, dashes__, shortname__, default_value__, \ 429 helpstring__, helparg__) \ 430 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 431 default_value__, helpstring__, helparg__, false, \ 432 const char*, const char*, options::parse_string, false) 433 434 // This is like DEFINE_string, but we convert each occurrence to a 435 // Search_directory and store it in a vector. Thus we also have the 436 // add_to_VARNAME() method, to append to the vector. 437 #define DEFINE_dirlist(varname__, dashes__, shortname__, \ 438 helpstring__, helparg__) \ 439 DEFINE_var(varname__, dashes__, shortname__, , \ 440 "", helpstring__, helparg__, false, options::Dir_list, \ 441 const options::Dir_list&, options::parse_dirlist, false) \ 442 void \ 443 add_to_##varname__(const char* new_value) \ 444 { options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \ 445 void \ 446 add_search_directory_to_##varname__(const Search_directory& dir) \ 447 { this->varname__##_.value.push_back(dir); } 448 449 // This is like DEFINE_string, but we store a set of strings. 450 #define DEFINE_set(varname__, dashes__, shortname__, \ 451 helpstring__, helparg__) \ 452 DEFINE_var(varname__, dashes__, shortname__, , \ 453 "", helpstring__, helparg__, false, options::String_set, \ 454 const options::String_set&, options::parse_set, false) \ 455 public: \ 456 bool \ 457 any_##varname__() const \ 458 { return !this->varname__##_.value.empty(); } \ 459 \ 460 bool \ 461 is_##varname__(const char* symbol) const \ 462 { \ 463 return (!this->varname__##_.value.empty() \ 464 && (this->varname__##_.value.find(std::string(symbol)) \ 465 != this->varname__##_.value.end())); \ 466 } \ 467 \ 468 options::String_set::const_iterator \ 469 varname__##_begin() const \ 470 { return this->varname__##_.value.begin(); } \ 471 \ 472 options::String_set::const_iterator \ 473 varname__##_end() const \ 474 { return this->varname__##_.value.end(); } \ 475 \ 476 options::String_set::size_type \ 477 varname__##_size() const \ 478 { return this->varname__##_.value.size(); } \ 479 480 // When you have a list of possible values (expressed as string) 481 // After helparg__ should come an initializer list, like 482 // {"foo", "bar", "baz"} 483 #define DEFINE_enum(varname__, dashes__, shortname__, default_value__, \ 484 helpstring__, helparg__, optional_arg__, ...) \ 485 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 486 default_value__, helpstring__, helparg__, optional_arg__, \ 487 const char*, const char*, parse_choices_##varname__, false) \ 488 private: \ 489 static void parse_choices_##varname__(const char* option_name, \ 490 const char* arg, \ 491 const char** retval) { \ 492 const char* choices[] = __VA_ARGS__; \ 493 options::parse_choices(option_name, arg, retval, \ 494 choices, sizeof(choices) / sizeof(*choices)); \ 495 } 496 497 // This is like DEFINE_bool, but VARNAME is the name of a different 498 // option. This option becomes an alias for that one. INVERT is true 499 // if this option is an inversion of the other one. 500 #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__, \ 501 helpstring__, no_helpstring__, invert__) \ 502 private: \ 503 struct Struct_##option__ : public options::Struct_var \ 504 { \ 505 Struct_##option__() \ 506 : option(#option__, dashes__, shortname__, "", helpstring__, \ 507 NULL, false, this, \ 508 General_options::varname__##is_default ^ invert__) \ 509 { } \ 510 \ 511 void \ 512 parse_to_value(const char*, const char*, \ 513 Command_line*, General_options* options) \ 514 { \ 515 options->set_##varname__(!invert__); \ 516 options->set_user_set_##varname__(); \ 517 } \ 518 \ 519 options::One_option option; \ 520 }; \ 521 Struct_##option__ option__##_; \ 522 \ 523 struct Struct_no_##option__ : public options::Struct_var \ 524 { \ 525 Struct_no_##option__() \ 526 : option((dashes__ == options::DASH_Z \ 527 ? "no" #option__ \ 528 : "no-" #option__), \ 529 dashes__, '\0', "", no_helpstring__, \ 530 NULL, false, this, \ 531 !General_options::varname__##is_default ^ invert__) \ 532 { } \ 533 \ 534 void \ 535 parse_to_value(const char*, const char*, \ 536 Command_line*, General_options* options) \ 537 { \ 538 options->set_##varname__(invert__); \ 539 options->set_user_set_##varname__(); \ 540 } \ 541 \ 542 options::One_option option; \ 543 }; \ 544 Struct_no_##option__ no_##option__##_initializer_ 545 546 // This is like DEFINE_uint64, but VARNAME is the name of a different 547 // option. This option becomes an alias for that one. 548 #define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \ 549 helpstring__, helparg__) \ 550 private: \ 551 struct Struct_##option__ : public options::Struct_var \ 552 { \ 553 Struct_##option__() \ 554 : option(#option__, dashes__, shortname__, "", helpstring__, \ 555 helparg__, false, this, false) \ 556 { } \ 557 \ 558 void \ 559 parse_to_value(const char* option_name, const char* arg, \ 560 Command_line*, General_options* options) \ 561 { \ 562 uint64_t value; \ 563 options::parse_uint64(option_name, arg, &value); \ 564 options->set_##varname__(value); \ 565 options->set_user_set_##varname__(); \ 566 } \ 567 \ 568 options::One_option option; \ 569 }; \ 570 Struct_##option__ option__##_; 571 572 // This is used for non-standard flags. It defines no functions; it 573 // just calls General_options::parse_VARNAME whenever the flag is 574 // seen. We declare parse_VARNAME as a static member of 575 // General_options; you are responsible for defining it there. 576 // helparg__ should be NULL iff this special-option is a boolean. 577 #define DEFINE_special(varname__, dashes__, shortname__, \ 578 helpstring__, helparg__) \ 579 private: \ 580 void parse_##varname__(const char* option, const char* arg, \ 581 Command_line* inputs); \ 582 struct Struct_##varname__ : public options::Struct_special \ 583 { \ 584 Struct_##varname__() \ 585 : options::Struct_special(#varname__, dashes__, shortname__, \ 586 &General_options::parse_##varname__, \ 587 helpstring__, helparg__) \ 588 { } \ 589 }; \ 590 Struct_##varname__ varname__##_initializer_ 591 592 // An option that takes an optional string argument. If the option is 593 // used with no argument, the value will be the default, and 594 // user_set_via_option will be true. 595 #define DEFINE_optional_string(varname__, dashes__, shortname__, \ 596 default_value__, \ 597 helpstring__, helparg__) \ 598 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 599 default_value__, helpstring__, helparg__, true, \ 600 const char*, const char*, options::parse_optional_string, \ 601 false) 602 603 // A directory to search. For each directory we record whether it is 604 // in the sysroot. We need to know this so that, if a linker script 605 // is found within the sysroot, we will apply the sysroot to any files 606 // named by that script. 607 608 class Search_directory 609 { 610 public: 611 // We need a default constructor because we put this in a 612 // std::vector. Search_directory()613 Search_directory() 614 : name_(), put_in_sysroot_(false), is_in_sysroot_(false) 615 { } 616 617 // This is the usual constructor. Search_directory(const std::string & name,bool put_in_sysroot)618 Search_directory(const std::string& name, bool put_in_sysroot) 619 : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false) 620 { 621 if (this->name_.empty()) 622 this->name_ = "."; 623 } 624 625 // This is called if we have a sysroot. The sysroot is prefixed to 626 // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is 627 // set to true for any enries which are in the sysroot (this will 628 // naturally include any entries for which put_in_sysroot_ is true). 629 // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of 630 // passing SYSROOT to lrealpath. 631 void 632 add_sysroot(const char* sysroot, const char* canonical_sysroot); 633 634 // Get the directory name. 635 const std::string& name()636 name() const 637 { return this->name_; } 638 639 // Return whether this directory is in the sysroot. 640 bool is_in_sysroot()641 is_in_sysroot() const 642 { return this->is_in_sysroot_; } 643 644 // Return whether this is considered a system directory. 645 bool is_system_directory()646 is_system_directory() const 647 { return this->put_in_sysroot_ || this->is_in_sysroot_; } 648 649 private: 650 // The directory name. 651 std::string name_; 652 // True if the sysroot should be added as a prefix for this 653 // directory (if there is a sysroot). This is true for system 654 // directories that we search by default. 655 bool put_in_sysroot_; 656 // True if this directory is in the sysroot (if there is a sysroot). 657 // This is true if there is a sysroot and either 1) put_in_sysroot_ 658 // is true, or 2) the directory happens to be in the sysroot based 659 // on a pathname comparison. 660 bool is_in_sysroot_; 661 }; 662 663 class General_options 664 { 665 private: 666 // NOTE: For every option that you add here, also consider if you 667 // should add it to Position_dependent_options. 668 DEFINE_special(help, options::TWO_DASHES, '\0', 669 N_("Report usage information"), NULL); 670 DEFINE_special(version, options::TWO_DASHES, 'v', 671 N_("Report version information"), NULL); 672 DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0', 673 N_("Report version and target information"), NULL); 674 675 // These options are sorted approximately so that for each letter in 676 // the alphabet, we show the option whose shortname is that letter 677 // (if any) and then every longname that starts with that letter (in 678 // alphabetical order). For both, lowercase sorts before uppercase. 679 // The -z options come last. 680 681 // a 682 683 DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false, 684 N_("Not supported"), 685 N_("Do not copy DT_NEEDED tags from shared libraries")); 686 687 DEFINE_bool_alias(allow_multiple_definition, muldefs, options::TWO_DASHES, 688 '\0', 689 N_("Allow multiple definitions of symbols"), 690 N_("Do not allow multiple definitions"), false); 691 692 DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false, 693 N_("Allow unresolved references in shared libraries"), 694 N_("Do not allow unresolved references in shared libraries")); 695 696 DEFINE_bool(apply_dynamic_relocs, options::TWO_DASHES, '\0', true, 697 N_("Apply link-time values for dynamic relocations"), 698 N_("(aarch64 only) Do not apply link-time values " 699 "for dynamic relocations")); 700 701 DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false, 702 N_("Use DT_NEEDED only for shared libraries that are used"), 703 N_("Use DT_NEEDED for all shared libraries")); 704 705 DEFINE_enum(assert, options::ONE_DASH, '\0', NULL, 706 N_("Ignored"), N_("[ignored]"), false, 707 {"definitions", "nodefinitions", "nosymbolic", "pure-text"}); 708 709 // b 710 711 // This should really be an "enum", but it's too easy for folks to 712 // forget to update the list as they add new targets. So we just 713 // accept any string. We'll fail later (when the string is parsed), 714 // if the target isn't actually supported. 715 DEFINE_string(format, options::TWO_DASHES, 'b', "elf", 716 N_("Set input format"), ("[elf,binary]")); 717 718 DEFINE_bool(be8, options::TWO_DASHES, '\0', false, 719 N_("Output BE8 format image"), NULL); 720 721 DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "tree", 722 N_("Generate build ID note"), 723 N_("[=STYLE]")); 724 725 DEFINE_uint64(build_id_chunk_size_for_treehash, 726 options::TWO_DASHES, '\0', 2 << 20, 727 N_("Chunk size for '--build-id=tree'"), N_("SIZE")); 728 729 DEFINE_uint64(build_id_min_file_size_for_treehash, options::TWO_DASHES, 730 '\0', 40 << 20, 731 N_("Minimum output file size for '--build-id=tree' to work" 732 " differently than '--build-id=sha1'"), N_("SIZE")); 733 734 DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true, 735 N_("-l searches for shared libraries"), NULL); 736 DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0', 737 N_("-l does not search for shared libraries"), NULL, 738 true); 739 DEFINE_bool_alias(dy, Bdynamic, options::ONE_DASH, '\0', 740 N_("alias for -Bdynamic"), NULL, false); 741 DEFINE_bool_alias(dn, Bdynamic, options::ONE_DASH, '\0', 742 N_("alias for -Bstatic"), NULL, true); 743 744 DEFINE_bool(Bgroup, options::ONE_DASH, '\0', false, 745 N_("Use group name lookup rules for shared library"), NULL); 746 747 DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false, 748 N_("Generate shared library (alias for -G/-shared)"), NULL); 749 750 DEFINE_special (Bno_symbolic, options::ONE_DASH, '\0', 751 N_ ("Don't bind default visibility defined symbols locally " 752 "for -shared (default)"), 753 NULL); 754 755 DEFINE_special (Bsymbolic_functions, options::ONE_DASH, '\0', 756 N_ ("Bind default visibility defined function symbols " 757 "locally for -shared"), 758 NULL); 759 760 DEFINE_special ( 761 Bsymbolic, options::ONE_DASH, '\0', 762 N_ ("Bind default visibility defined symbols locally for -shared"), 763 NULL); 764 765 // c 766 767 DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true, 768 N_("Check segment addresses for overlaps"), 769 N_("Do not check segment addresses for overlaps")); 770 771 DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none", 772 N_("Compress .debug_* sections in the output file"), 773 ("[none,zlib,zlib-gnu,zlib-gabi]"), false, 774 {"none", "zlib", "zlib-gnu", "zlib-gabi"}); 775 776 DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false, 777 N_("Not supported"), 778 N_("Do not copy DT_NEEDED tags from shared libraries")); 779 780 DEFINE_bool(cref, options::TWO_DASHES, '\0', false, 781 N_("Output cross reference table"), 782 N_("Do not output cross reference table")); 783 784 DEFINE_bool(ctors_in_init_array, options::TWO_DASHES, '\0', true, 785 N_("Use DT_INIT_ARRAY for all constructors"), 786 N_("Handle constructors as directed by compiler")); 787 788 // d 789 790 DEFINE_bool(define_common, options::TWO_DASHES, 'd', false, 791 N_("Define common symbols"), 792 N_("Do not define common symbols in relocatable output")); 793 DEFINE_bool(dc, options::ONE_DASH, '\0', false, 794 N_("Alias for -d"), NULL); 795 DEFINE_bool(dp, options::ONE_DASH, '\0', false, 796 N_("Alias for -d"), NULL); 797 798 DEFINE_string(debug, options::TWO_DASHES, '\0', "", 799 N_("Turn on debugging"), 800 N_("[all,files,script,task][,...]")); 801 802 DEFINE_special(defsym, options::TWO_DASHES, '\0', 803 N_("Define a symbol"), N_("SYMBOL=EXPRESSION")); 804 805 DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL, 806 N_("Demangle C++ symbols in log messages"), 807 N_("[=STYLE]")); 808 DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false, 809 N_("Do not demangle C++ symbols in log messages"), 810 NULL); 811 812 DEFINE_string(dependency_file, options::TWO_DASHES, '\0', NULL, 813 N_("Write a dependency file listing all files read"), 814 N_("FILE")); 815 816 DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false, 817 N_("Look for violations of the C++ One Definition Rule"), 818 N_("Do not look for violations of the C++ One Definition Rule")); 819 820 DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false, 821 N_("Add data symbols to dynamic symbols"), NULL); 822 823 DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false, 824 N_("Add C++ operator new/delete to dynamic symbols"), NULL); 825 826 DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false, 827 N_("Add C++ typeinfo to dynamic symbols"), NULL); 828 829 DEFINE_special(dynamic_list, options::TWO_DASHES, '\0', 830 N_("Read a list of dynamic symbols"), N_("FILE")); 831 832 // e 833 834 DEFINE_bool(emit_stub_syms, options::TWO_DASHES, '\0', true, 835 N_("(PowerPC only) Label linker stubs with a symbol"), 836 N_("(PowerPC only) Do not label linker stubs with a symbol")); 837 838 DEFINE_string(entry, options::TWO_DASHES, 'e', NULL, 839 N_("Set program start address"), N_("ADDRESS")); 840 841 DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false, 842 N_("Create exception frame header"), 843 N_("Do not create exception frame header")); 844 845 // Alphabetized under 'e' because the option is spelled --enable-new-dtags. 846 DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true, 847 N_("Enable use of DT_RUNPATH"), 848 N_("Disable use of DT_RUNPATH")); 849 850 DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL, 851 N_("(ARM only) Do not warn about objects with incompatible " 852 "enum sizes")); 853 854 DEFINE_special(exclude_libs, options::TWO_DASHES, '\0', 855 N_("Exclude libraries from automatic export"), 856 N_(("lib,lib ..."))); 857 858 DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false, 859 N_("Export all dynamic symbols"), 860 N_("Do not export all dynamic symbols")); 861 862 DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0', 863 N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL")); 864 865 DEFINE_special(EB, options::ONE_DASH, '\0', 866 N_("Link big-endian objects."), NULL); 867 DEFINE_special(EL, options::ONE_DASH, '\0', 868 N_("Link little-endian objects."), NULL); 869 870 // f 871 872 DEFINE_set(auxiliary, options::TWO_DASHES, 'f', 873 N_("Auxiliary filter for shared object symbol table"), 874 N_("SHLIB")); 875 876 DEFINE_string(filter, options::TWO_DASHES, 'F', NULL, 877 N_("Filter for shared object symbol table"), 878 N_("SHLIB")); 879 880 DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false, 881 N_("Treat warnings as errors"), 882 N_("Do not treat warnings as errors")); 883 884 DEFINE_string(fini, options::ONE_DASH, '\0', "_fini", 885 N_("Call SYMBOL at unload-time"), N_("SYMBOL")); 886 887 DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true, 888 N_("(ARM only) Fix binaries for ARM1176 erratum"), 889 N_("(ARM only) Do not fix binaries for ARM1176 erratum")); 890 891 DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false, 892 N_("(ARM only) Fix binaries for Cortex-A8 erratum"), 893 N_("(ARM only) Do not fix binaries for Cortex-A8 erratum")); 894 895 DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false, 896 N_("(AArch64 only) Fix Cortex-A53 erratum 843419"), 897 N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419")); 898 899 DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false, 900 N_("(AArch64 only) Fix Cortex-A53 erratum 835769"), 901 N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769")); 902 903 DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0', 904 N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"), 905 NULL); 906 907 DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0', 908 N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking " 909 "veneer"), 910 NULL); 911 912 DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "", 913 N_("Ignored for GCC linker option compatibility"), 914 N_("[gold,bfd]")); 915 916 // g 917 918 DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false, 919 N_("Ignored"), NULL); 920 921 DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false, 922 N_("Remove unused sections"), 923 N_("Don't remove unused sections")); 924 925 DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false, 926 N_("Generate .gdb_index section"), 927 N_("Do not generate .gdb_index section")); 928 929 DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true, 930 N_("Enable STB_GNU_UNIQUE symbol binding"), 931 N_("Disable STB_GNU_UNIQUE symbol binding")); 932 933 DEFINE_bool(shared, options::ONE_DASH, 'G', false, 934 N_("Generate shared library"), NULL); 935 936 // h 937 938 DEFINE_string(soname, options::ONE_DASH, 'h', NULL, 939 N_("Set shared library name"), N_("FILENAME")); 940 941 DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0, 942 N_("Min fraction of empty buckets in dynamic hash"), 943 N_("FRACTION")); 944 945 DEFINE_enum(hash_style, options::TWO_DASHES, '\0', DEFAULT_HASH_STYLE, 946 N_("Dynamic hash style"), N_("[sysv,gnu,both]"), false, 947 {"sysv", "gnu", "both"}); 948 949 // i 950 951 DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0', 952 N_("Alias for -r"), NULL, false); 953 954 DEFINE_enum(icf, options::TWO_DASHES, '\0', "none", 955 N_("Identical Code Folding. " 956 "\'--icf=safe\' Folds ctors, dtors and functions whose" 957 " pointers are definitely not taken"), 958 ("[none,all,safe]"), false, 959 {"none", "all", "safe"}); 960 961 DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0, 962 N_("Number of iterations of ICF (default 3)"), N_("COUNT")); 963 964 DEFINE_special(incremental, options::TWO_DASHES, '\0', 965 N_("Do an incremental link if possible; " 966 "otherwise, do a full link and prepare output " 967 "for incremental linking"), NULL); 968 969 DEFINE_special(no_incremental, options::TWO_DASHES, '\0', 970 N_("Do a full link (default)"), NULL); 971 972 DEFINE_special(incremental_full, options::TWO_DASHES, '\0', 973 N_("Do a full link and " 974 "prepare output for incremental linking"), NULL); 975 976 DEFINE_special(incremental_update, options::TWO_DASHES, '\0', 977 N_("Do an incremental link; exit if not possible"), NULL); 978 979 DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL, 980 N_("Set base file for incremental linking" 981 " (default is output file)"), 982 N_("FILE")); 983 984 DEFINE_special(incremental_changed, options::TWO_DASHES, '\0', 985 N_("Assume files changed"), NULL); 986 987 DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0', 988 N_("Assume files didn't change"), NULL); 989 990 DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0', 991 N_("Use timestamps to check files (default)"), NULL); 992 993 DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0', 994 N_("Assume startup files unchanged " 995 "(files preceding this option)"), NULL); 996 997 DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10, 998 N_("Amount of extra space to allocate for patches " 999 "(default 10)"), 1000 N_("PERCENT")); 1001 1002 DEFINE_string(init, options::ONE_DASH, '\0', "_init", 1003 N_("Call SYMBOL at load-time"), N_("SYMBOL")); 1004 1005 DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL, 1006 N_("Set dynamic linker path"), N_("PROGRAM")); 1007 1008 // j 1009 1010 DEFINE_special(just_symbols, options::TWO_DASHES, '\0', 1011 N_("Read only symbol values from FILE"), N_("FILE")); 1012 1013 // k 1014 1015 DEFINE_bool(keep_files_mapped, options::TWO_DASHES, '\0', true, 1016 N_("Keep files mapped across passes"), 1017 N_("Release mapped files after each pass")); 1018 1019 DEFINE_set(keep_unique, options::TWO_DASHES, '\0', 1020 N_("Do not fold this symbol during ICF"), N_("SYMBOL")); 1021 1022 // l 1023 1024 DEFINE_special(library, options::TWO_DASHES, 'l', 1025 N_("Search for library LIBNAME"), N_("LIBNAME")); 1026 1027 DEFINE_bool(ld_generated_unwind_info, options::TWO_DASHES, '\0', true, 1028 N_("Generate unwind information for PLT"), 1029 N_("Do not generate unwind information for PLT")); 1030 1031 DEFINE_dirlist(library_path, options::TWO_DASHES, 'L', 1032 N_("Add directory to search path"), N_("DIR")); 1033 1034 DEFINE_bool(long_plt, options::TWO_DASHES, '\0', false, 1035 N_("(ARM only) Generate long PLT entries"), 1036 N_("(ARM only) Do not generate long PLT entries")); 1037 1038 // m 1039 1040 DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "", 1041 N_("Set GNU linker emulation; obsolete"), N_("EMULATION")); 1042 1043 DEFINE_bool(map_whole_files, options::TWO_DASHES, '\0', 1044 sizeof(void*) >= 8, 1045 N_("Map whole files to memory"), 1046 N_("Map relevant file parts to memory")); 1047 1048 DEFINE_bool(merge_exidx_entries, options::TWO_DASHES, '\0', true, 1049 N_("(ARM only) Merge exidx entries in debuginfo"), 1050 N_("(ARM only) Do not merge exidx entries in debuginfo")); 1051 1052 DEFINE_bool(mmap_output_file, options::TWO_DASHES, '\0', true, 1053 N_("Map the output file for writing"), 1054 N_("Do not map the output file for writing")); 1055 1056 DEFINE_bool(print_map, options::TWO_DASHES, 'M', false, 1057 N_("Write map file on standard output"), NULL); 1058 1059 DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"), 1060 N_("MAPFILENAME")); 1061 1062 // n 1063 1064 DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false, 1065 N_("Do not page align data"), NULL); 1066 DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false, 1067 N_("Do not page align data, do not make text readonly"), 1068 N_("Page align data, make text readonly")); 1069 1070 DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false, 1071 N_("Use less memory and more disk I/O " 1072 "(included only for compatibility with GNU ld)"), NULL); 1073 1074 DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0', 1075 N_("Report undefined symbols (even with --shared)"), 1076 NULL, false); 1077 1078 DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false, 1079 N_("Create an output file even if errors occur"), NULL); 1080 1081 DEFINE_bool(nostdlib, options::ONE_DASH, '\0', false, 1082 N_("Only search directories specified on the command line"), 1083 NULL); 1084 1085 // o 1086 1087 DEFINE_string(output, options::TWO_DASHES, 'o', "a.out", 1088 N_("Set output file name"), N_("FILE")); 1089 1090 DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf", 1091 N_("Set output format"), N_("[binary]")); 1092 1093 DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0, 1094 N_("Optimize output file size"), N_("LEVEL")); 1095 1096 DEFINE_enum(orphan_handling, options::TWO_DASHES, '\0', "place", 1097 N_("Orphan section handling"), N_("[place,discard,warn,error]"), 1098 false, {"place", "discard", "warn", "error"}); 1099 1100 // p 1101 1102 DEFINE_bool(p, options::ONE_DASH, 'p', false, 1103 N_("Ignored for ARM compatibility"), NULL); 1104 1105 DEFINE_bool(pie, options::ONE_DASH, '\0', false, 1106 N_("Create a position independent executable"), 1107 N_("Do not create a position independent executable")); 1108 DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0', 1109 N_("Create a position independent executable"), 1110 N_("Do not create a position independent executable"), 1111 false); 1112 1113 DEFINE_bool(pic_veneer, options::TWO_DASHES, '\0', false, 1114 N_("Force PIC sequences for ARM/Thumb interworking veneers"), 1115 NULL); 1116 1117 DEFINE_bool(pipeline_knowledge, options::ONE_DASH, '\0', false, 1118 NULL, N_("(ARM only) Ignore for backward compatibility")); 1119 1120 DEFINE_var(plt_align, options::TWO_DASHES, '\0', 0, "5", 1121 N_("(PowerPC only) Align PLT call stubs to fit cache lines"), 1122 N_("[=P2ALIGN]"), true, int, int, options::parse_uint, false); 1123 1124 DEFINE_bool(plt_localentry, options::TWO_DASHES, '\0', false, 1125 N_("(PowerPC64 only) Optimize calls to ELFv2 localentry:0 functions"), 1126 N_("(PowerPC64 only) Don't optimize ELFv2 calls")); 1127 1128 DEFINE_bool(plt_static_chain, options::TWO_DASHES, '\0', false, 1129 N_("(PowerPC64 only) PLT call stubs should load r11"), 1130 N_("(PowerPC64 only) PLT call stubs should not load r11")); 1131 1132 DEFINE_bool(plt_thread_safe, options::TWO_DASHES, '\0', false, 1133 N_("(PowerPC64 only) PLT call stubs with load-load barrier"), 1134 N_("(PowerPC64 only) PLT call stubs without barrier")); 1135 1136 #ifdef ENABLE_PLUGINS 1137 DEFINE_special(plugin, options::TWO_DASHES, '\0', 1138 N_("Load a plugin library"), N_("PLUGIN")); 1139 DEFINE_special(plugin_opt, options::TWO_DASHES, '\0', 1140 N_("Pass an option to the plugin"), N_("OPTION")); 1141 #else 1142 DEFINE_special(plugin, options::TWO_DASHES, '\0', 1143 N_("Load a plugin library (not supported)"), N_("PLUGIN")); 1144 DEFINE_special(plugin_opt, options::TWO_DASHES, '\0', 1145 N_("Pass an option to the plugin (not supported)"), 1146 N_("OPTION")); 1147 #endif 1148 1149 DEFINE_bool(posix_fallocate, options::TWO_DASHES, '\0', true, 1150 N_("Use posix_fallocate to reserve space in the output file"), 1151 N_("Use fallocate or ftruncate to reserve space")); 1152 1153 DEFINE_enum(power10_stubs, options::TWO_DASHES, '\0', "yes", 1154 N_("(PowerPC64 only) stubs use power10 insns"), 1155 N_("[=auto,no,yes]"), true, {"auto", "no", "yes"}); 1156 DEFINE_special(no_power10_stubs, options::TWO_DASHES, '\0', 1157 N_("(PowerPC64 only) stubs do not use power10 insns"), NULL); 1158 1159 DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false, 1160 N_("Preread archive symbols when multi-threaded"), NULL); 1161 1162 DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false, 1163 N_("List removed unused sections on stderr"), 1164 N_("Do not list removed unused sections")); 1165 1166 DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false, 1167 N_("List folded identical sections on stderr"), 1168 N_("Do not list folded identical sections")); 1169 1170 DEFINE_bool(print_output_format, options::TWO_DASHES, '\0', false, 1171 N_("Print default output format"), NULL); 1172 1173 DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL, 1174 N_("Print symbols defined and used for each input"), 1175 N_("FILENAME")); 1176 1177 DEFINE_special(push_state, options::TWO_DASHES, '\0', 1178 N_("Save the state of flags related to input files"), NULL); 1179 DEFINE_special(pop_state, options::TWO_DASHES, '\0', 1180 N_("Restore the state of flags related to input files"), NULL); 1181 1182 // q 1183 1184 DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false, 1185 N_("Generate relocations in output"), NULL); 1186 1187 DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false, 1188 N_("Ignored for SVR4 compatibility"), NULL); 1189 1190 // r 1191 1192 DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false, 1193 N_("Generate relocatable output"), NULL); 1194 1195 DEFINE_bool(relax, options::TWO_DASHES, '\0', false, 1196 N_("Relax branches on certain targets"), 1197 N_("Do not relax branches")); 1198 1199 DEFINE_string(retain_symbols_file, options::TWO_DASHES, '\0', NULL, 1200 N_("keep only symbols listed in this file"), N_("FILE")); 1201 1202 DEFINE_bool(rosegment, options::TWO_DASHES, '\0', false, 1203 N_("Put read-only non-executable sections in their own segment"), 1204 N_("Do not put read-only non-executable sections in their own segment")); 1205 1206 DEFINE_uint64(rosegment_gap, options::TWO_DASHES, '\0', -1U, 1207 N_("Set offset between executable and read-only segments"), 1208 N_("OFFSET")); 1209 1210 // -R really means -rpath, but can mean --just-symbols for 1211 // compatibility with GNU ld. -rpath is always -rpath, so we list 1212 // it separately. 1213 DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R', 1214 N_("Add DIR to runtime search path"), N_("DIR")); 1215 1216 DEFINE_dirlist(rpath, options::ONE_DASH, '\0', 1217 N_("Add DIR to runtime search path"), N_("DIR")); 1218 1219 DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0', 1220 N_("Add DIR to link time shared library search path"), 1221 N_("DIR")); 1222 1223 // s 1224 1225 DEFINE_bool(strip_all, options::TWO_DASHES, 's', false, 1226 N_("Strip all symbols"), NULL); 1227 DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false, 1228 N_("Strip debugging information"), NULL); 1229 DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false, 1230 N_("Emit only debug line number information"), NULL); 1231 DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false, 1232 N_("Strip debug symbols that are unused by gdb " 1233 "(at least versions <= 7.4)"), NULL); 1234 DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true, 1235 N_("Strip LTO intermediate code sections"), NULL); 1236 1237 DEFINE_string(section_ordering_file, options::TWO_DASHES, '\0', NULL, 1238 N_("Layout sections in the order specified"), 1239 N_("FILENAME")); 1240 1241 DEFINE_special(section_start, options::TWO_DASHES, '\0', 1242 N_("Set address of section"), N_("SECTION=ADDRESS")); 1243 1244 DEFINE_bool(secure_plt, options::TWO_DASHES , '\0', true, 1245 N_("(PowerPC only) Use new-style PLT"), NULL); 1246 1247 DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL, 1248 N_("Sort common symbols by alignment"), 1249 N_("[={ascending,descending}]")); 1250 1251 DEFINE_enum(sort_section, options::TWO_DASHES, '\0', "none", 1252 N_("Sort sections by name. \'--no-text-reorder\'" 1253 " will override \'--sort-section=name\' for .text"), 1254 N_("[none,name]"), false, 1255 {"none", "name"}); 1256 1257 DEFINE_uint(spare_dynamic_tags, options::TWO_DASHES, '\0', 5, 1258 N_("Dynamic tag slots to reserve (default 5)"), 1259 N_("COUNT")); 1260 1261 DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1, 1262 N_("(ARM, PowerPC only) The maximum distance from instructions " 1263 "in a group of sections to their stubs. Negative values mean " 1264 "stubs are always after the group. 1 means use default size"), 1265 N_("SIZE")); 1266 1267 DEFINE_bool(stub_group_multi, options::TWO_DASHES, '\0', true, 1268 N_("(PowerPC only) Allow a group of stubs to serve multiple " 1269 "output sections"), 1270 N_("(PowerPC only) Each output section has its own stubs")); 1271 1272 DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x100000, 1273 N_("Stack size when -fsplit-stack function calls non-split"), 1274 N_("SIZE")); 1275 1276 // This is not actually special in any way, but I need to give it 1277 // a non-standard accessor-function name because 'static' is a keyword. 1278 DEFINE_special(static, options::ONE_DASH, '\0', 1279 N_("Do not link against shared libraries"), NULL); 1280 1281 DEFINE_special(start_lib, options::TWO_DASHES, '\0', 1282 N_("Start a library"), NULL); 1283 DEFINE_special(end_lib, options::TWO_DASHES, '\0', 1284 N_("End a library "), NULL); 1285 1286 DEFINE_bool(stats, options::TWO_DASHES, '\0', false, 1287 N_("Print resource usage statistics"), NULL); 1288 1289 DEFINE_string(sysroot, options::TWO_DASHES, '\0', "", 1290 N_("Set target system root directory"), N_("DIR")); 1291 1292 // t 1293 1294 DEFINE_bool(trace, options::TWO_DASHES, 't', false, 1295 N_("Print the name of each input file"), NULL); 1296 1297 DEFINE_bool(target1_abs, options::TWO_DASHES, '\0', false, 1298 N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_ABS32"), 1299 NULL); 1300 DEFINE_bool(target1_rel, options::TWO_DASHES, '\0', false, 1301 N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_REL32"), 1302 NULL); 1303 DEFINE_enum(target2, options::TWO_DASHES, '\0', NULL, 1304 N_("(ARM only) Set R_ARM_TARGET2 relocation type"), 1305 N_("[rel, abs, got-rel"), false, 1306 {"rel", "abs", "got-rel"}); 1307 1308 DEFINE_bool(text_reorder, options::TWO_DASHES, '\0', true, 1309 N_("Enable text section reordering for GCC section names"), 1310 N_("Disable text section reordering for GCC section names")); 1311 1312 DEFINE_bool(threads, options::TWO_DASHES, '\0', false, 1313 N_("Run the linker multi-threaded"), 1314 N_("Do not run the linker multi-threaded")); 1315 DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0, 1316 N_("Number of threads to use"), N_("COUNT")); 1317 DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0, 1318 N_("Number of threads to use in initial pass"), N_("COUNT")); 1319 DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0, 1320 N_("Number of threads to use in middle pass"), N_("COUNT")); 1321 DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0, 1322 N_("Number of threads to use in final pass"), N_("COUNT")); 1323 1324 DEFINE_bool(tls_optimize, options::TWO_DASHES, '\0', true, 1325 N_("(PowerPC/64 only) Optimize GD/LD/IE code to IE/LE"), 1326 N_("(PowerPC/64 only) Don'\''t try to optimize TLS accesses")); 1327 DEFINE_bool(tls_get_addr_optimize, options::TWO_DASHES, '\0', true, 1328 N_("(PowerPC/64 only) Use a special __tls_get_addr call"), 1329 N_("(PowerPC/64 only) Don't use a special __tls_get_addr call")); 1330 1331 DEFINE_bool(toc_optimize, options::TWO_DASHES, '\0', true, 1332 N_("(PowerPC64 only) Optimize TOC code sequences"), 1333 N_("(PowerPC64 only) Don't optimize TOC code sequences")); 1334 1335 DEFINE_bool(toc_sort, options::TWO_DASHES, '\0', true, 1336 N_("(PowerPC64 only) Sort TOC and GOT sections"), 1337 N_("(PowerPC64 only) Don't sort TOC and GOT sections")); 1338 1339 DEFINE_special(script, options::TWO_DASHES, 'T', 1340 N_("Read linker script"), N_("FILE")); 1341 1342 DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U, 1343 N_("Set the address of the bss segment"), N_("ADDRESS")); 1344 DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U, 1345 N_("Set the address of the data segment"), N_("ADDRESS")); 1346 DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U, 1347 N_("Set the address of the text segment"), N_("ADDRESS")); 1348 DEFINE_uint64_alias(Ttext_segment, Ttext, options::ONE_DASH, '\0', 1349 N_("Set the address of the text segment"), 1350 N_("ADDRESS")); 1351 DEFINE_uint64(Trodata_segment, options::ONE_DASH, '\0', -1U, 1352 N_("Set the address of the rodata segment"), N_("ADDRESS")); 1353 1354 // u 1355 1356 DEFINE_set(undefined, options::TWO_DASHES, 'u', 1357 N_("Create undefined reference to SYMBOL"), N_("SYMBOL")); 1358 1359 DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL, 1360 N_("How to handle unresolved symbols"), 1361 ("ignore-all,report-all,ignore-in-object-files," 1362 "ignore-in-shared-libs"), false, 1363 {"ignore-all", "report-all", "ignore-in-object-files", 1364 "ignore-in-shared-libs"}); 1365 1366 // v 1367 1368 DEFINE_bool(verbose, options::TWO_DASHES, '\0', false, 1369 N_("Alias for --debug=files"), NULL); 1370 1371 DEFINE_special(version_script, options::TWO_DASHES, '\0', 1372 N_("Read version script"), N_("FILE")); 1373 1374 // w 1375 1376 DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false, 1377 N_("Warn about duplicate common symbols"), 1378 N_("Do not warn about duplicate common symbols")); 1379 1380 DEFINE_bool_ignore(warn_constructors, options::TWO_DASHES, '\0', 1381 N_("Ignored"), N_("Ignored")); 1382 1383 DEFINE_bool(warn_drop_version, options::TWO_DASHES, '\0', false, 1384 N_("Warn when discarding version information"), 1385 N_("Do not warn when discarding version information")); 1386 1387 DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false, 1388 N_("Warn if the stack is executable"), 1389 N_("Do not warn if the stack is executable")); 1390 1391 DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true, 1392 NULL, N_("Don't warn about mismatched input files")); 1393 1394 DEFINE_bool(warn_multiple_gp, options::TWO_DASHES, '\0', false, 1395 N_("Ignored"), NULL); 1396 1397 DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true, 1398 N_("Warn when skipping an incompatible library"), 1399 N_("Don't warn when skipping an incompatible library")); 1400 1401 DEFINE_bool(warn_shared_textrel, options::TWO_DASHES, '\0', false, 1402 N_("Warn if text segment is not shareable"), 1403 N_("Do not warn if text segment is not shareable")); 1404 1405 DEFINE_bool(warn_unresolved_symbols, options::TWO_DASHES, '\0', false, 1406 N_("Report unresolved symbols as warnings"), 1407 NULL); 1408 DEFINE_bool_alias(error_unresolved_symbols, warn_unresolved_symbols, 1409 options::TWO_DASHES, '\0', 1410 N_("Report unresolved symbols as errors"), 1411 NULL, true); 1412 1413 DEFINE_bool(wchar_size_warning, options::TWO_DASHES, '\0', true, NULL, 1414 N_("(ARM only) Do not warn about objects with incompatible " 1415 "wchar_t sizes")); 1416 1417 DEFINE_bool(weak_unresolved_symbols, options::TWO_DASHES, '\0', false, 1418 N_("Convert unresolved symbols to weak references"), 1419 NULL); 1420 1421 DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false, 1422 N_("Include all archive contents"), 1423 N_("Include only needed archive contents")); 1424 1425 DEFINE_set(wrap, options::TWO_DASHES, '\0', 1426 N_("Use wrapper functions for SYMBOL"), N_("SYMBOL")); 1427 1428 // x 1429 1430 DEFINE_special(discard_all, options::TWO_DASHES, 'x', 1431 N_("Delete all local symbols"), NULL); 1432 DEFINE_special(discard_locals, options::TWO_DASHES, 'X', 1433 N_("Delete all temporary local symbols"), NULL); 1434 DEFINE_special(discard_none, options::TWO_DASHES, '\0', 1435 N_("Keep all local symbols"), NULL); 1436 1437 // y 1438 1439 DEFINE_set(trace_symbol, options::TWO_DASHES, 'y', 1440 N_("Trace references to symbol"), N_("SYMBOL")); 1441 1442 DEFINE_bool(undefined_version, options::TWO_DASHES, '\0', true, 1443 N_("Allow unused version in script"), 1444 N_("Do not allow unused version in script")); 1445 1446 DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "", 1447 N_("Default search path for Solaris compatibility"), 1448 N_("PATH")); 1449 1450 // special characters 1451 1452 DEFINE_special(start_group, options::TWO_DASHES, '(', 1453 N_("Start a library search group"), NULL); 1454 DEFINE_special(end_group, options::TWO_DASHES, ')', 1455 N_("End a library search group"), NULL); 1456 1457 // The -z options. 1458 1459 DEFINE_bool(bndplt, options::DASH_Z, '\0', false, 1460 N_("(x86-64 only) Generate a BND PLT for Intel MPX"), 1461 N_("Generate a regular PLT")); 1462 DEFINE_bool(combreloc, options::DASH_Z, '\0', true, 1463 N_("Sort dynamic relocs"), 1464 N_("Do not sort dynamic relocs")); 1465 DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0, 1466 N_("Set common page size to SIZE"), N_("SIZE")); 1467 DEFINE_bool(defs, options::DASH_Z, '\0', false, 1468 N_("Report undefined symbols (even with --shared)"), 1469 NULL); 1470 DEFINE_bool(execstack, options::DASH_Z, '\0', false, 1471 N_("Mark output as requiring executable stack"), NULL); 1472 DEFINE_bool(global, options::DASH_Z, '\0', false, 1473 N_("Make symbols in DSO available for subsequently loaded " 1474 "objects"), NULL); 1475 DEFINE_bool(initfirst, options::DASH_Z, '\0', false, 1476 N_("Mark DSO to be initialized first at runtime"), 1477 NULL); 1478 DEFINE_bool(interpose, options::DASH_Z, '\0', false, 1479 N_("Mark object to interpose all DSOs but executable"), 1480 NULL); 1481 DEFINE_bool(unique, options::DASH_Z, '\0', false, 1482 N_("Mark DSO to be loaded at most once, and only in the main namespace"), 1483 N_("Do not mark the DSO as one to be loaded only in the main namespace")); 1484 DEFINE_bool_alias(lazy, now, options::DASH_Z, '\0', 1485 N_("Mark object for lazy runtime binding"), 1486 NULL, true); 1487 DEFINE_bool(loadfltr, options::DASH_Z, '\0', false, 1488 N_("Mark object requiring immediate process"), 1489 NULL); 1490 DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0, 1491 N_("Set maximum page size to SIZE"), N_("SIZE")); 1492 DEFINE_bool(muldefs, options::DASH_Z, '\0', false, 1493 N_("Allow multiple definitions of symbols"), 1494 NULL); 1495 // copyreloc is here in the list because there is only -z 1496 // nocopyreloc, not -z copyreloc. 1497 DEFINE_bool(copyreloc, options::DASH_Z, '\0', true, 1498 NULL, 1499 N_("Do not create copy relocs")); 1500 DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false, 1501 N_("Mark object not to use default search paths"), 1502 NULL); 1503 DEFINE_bool(nodelete, options::DASH_Z, '\0', false, 1504 N_("Mark DSO non-deletable at runtime"), 1505 NULL); 1506 DEFINE_bool(nodlopen, options::DASH_Z, '\0', false, 1507 N_("Mark DSO not available to dlopen"), 1508 NULL); 1509 DEFINE_bool(nodump, options::DASH_Z, '\0', false, 1510 N_("Mark DSO not available to dldump"), 1511 NULL); 1512 DEFINE_bool(noexecstack, options::DASH_Z, '\0', false, 1513 N_("Mark output as not requiring executable stack"), NULL); 1514 DEFINE_bool(now, options::DASH_Z, '\0', false, 1515 N_("Mark object for immediate function binding"), 1516 NULL); 1517 DEFINE_bool(origin, options::DASH_Z, '\0', false, 1518 N_("Mark DSO to indicate that needs immediate $ORIGIN " 1519 "processing at runtime"), NULL); 1520 DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO, 1521 N_("Where possible mark variables read-only after relocation"), 1522 N_("Don't mark variables read-only after relocation")); 1523 DEFINE_uint64(stack_size, options::DASH_Z, '\0', 0, 1524 N_("Set PT_GNU_STACK segment p_memsz to SIZE"), N_("SIZE")); 1525 DEFINE_enum(start_stop_visibility, options::DASH_Z, '\0', "protected", 1526 N_("ELF symbol visibility for synthesized " 1527 "__start_* and __stop_* symbols"), 1528 ("[default,internal,hidden,protected]"), false, 1529 {"default", "internal", "hidden", "protected"}); 1530 DEFINE_bool(text, options::DASH_Z, '\0', false, 1531 N_("Do not permit relocations in read-only segments"), 1532 N_("Permit relocations in read-only segments")); 1533 DEFINE_bool_alias(textoff, text, options::DASH_Z, '\0', 1534 N_("Permit relocations in read-only segments"), 1535 NULL, true); 1536 DEFINE_bool(text_unlikely_segment, options::DASH_Z, '\0', false, 1537 N_("Move .text.unlikely sections to a separate segment."), 1538 N_("Do not move .text.unlikely sections to a separate " 1539 "segment.")); 1540 DEFINE_bool(keep_text_section_prefix, options::DASH_Z, '\0', false, 1541 N_("Keep .text.hot, .text.startup, .text.exit and .text.unlikely " 1542 "as separate sections in the final binary."), 1543 N_("Merge all .text.* prefix sections.")); 1544 1545 1546 public: 1547 typedef options::Dir_list Dir_list; 1548 1549 General_options(); 1550 1551 // Does post-processing on flags, making sure they all have 1552 // non-conflicting values. Also converts some flags from their 1553 // "standard" types (string, etc), to another type (enum, DirList), 1554 // which can be accessed via a separate method. Dies if it notices 1555 // any problems. 1556 void finalize(); 1557 1558 // True if we printed the version information. 1559 bool printed_version()1560 printed_version() const 1561 { return this->printed_version_; } 1562 1563 // The macro defines output() (based on --output), but that's a 1564 // generic name. Provide this alternative name, which is clearer. 1565 const char* output_file_name()1566 output_file_name() const 1567 { return this->output(); } 1568 1569 // This is not defined via a flag, but combines flags to say whether 1570 // the output is position-independent or not. 1571 bool output_is_position_independent()1572 output_is_position_independent() const 1573 { return this->shared() || this->pie(); } 1574 1575 // Return true if the output is something that can be exec()ed, such 1576 // as a static executable, or a position-dependent or 1577 // position-independent executable, but not a dynamic library or an 1578 // object file. 1579 bool output_is_executable()1580 output_is_executable() const 1581 { return !this->shared() && !this->relocatable(); } 1582 1583 // This would normally be static(), and defined automatically, but 1584 // since static is a keyword, we need to come up with our own name. 1585 bool is_static()1586 is_static() const 1587 { return static_; } 1588 1589 // In addition to getting the input and output formats as a string 1590 // (via format() and oformat()), we also give access as an enum. 1591 enum Object_format 1592 { 1593 // Ordinary ELF. 1594 OBJECT_FORMAT_ELF, 1595 // Straight binary format. 1596 OBJECT_FORMAT_BINARY 1597 }; 1598 1599 // Convert a string to an Object_format. Gives an error if the 1600 // string is not recognized. 1601 static Object_format 1602 string_to_object_format(const char* arg); 1603 1604 // Convert an Object_format to string. 1605 static const char* 1606 object_format_to_string(Object_format); 1607 1608 // Note: these functions are not very fast. 1609 Object_format format_enum() const; 1610 Object_format oformat_enum() const; 1611 1612 // Return whether FILENAME is in a system directory. 1613 bool 1614 is_in_system_directory(const std::string& name) const; 1615 1616 // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_. 1617 bool should_retain_symbol(const char * symbol_name)1618 should_retain_symbol(const char* symbol_name) const 1619 { 1620 if (symbols_to_retain_.empty()) // means flag wasn't specified 1621 return true; 1622 return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end(); 1623 } 1624 1625 // These are the best way to get access to the execstack state, 1626 // not execstack() and noexecstack() which are hard to use properly. 1627 bool is_execstack_set()1628 is_execstack_set() const 1629 { return this->execstack_status_ != EXECSTACK_FROM_INPUT; } 1630 1631 bool is_stack_executable()1632 is_stack_executable() const 1633 { return this->execstack_status_ == EXECSTACK_YES; } 1634 1635 bool icf_enabled()1636 icf_enabled() const 1637 { return this->icf_status_ != ICF_NONE; } 1638 1639 bool icf_safe_folding()1640 icf_safe_folding() const 1641 { return this->icf_status_ == ICF_SAFE; } 1642 1643 // The --demangle option takes an optional string, and there is also 1644 // a --no-demangle option. This is the best way to decide whether 1645 // to demangle or not. 1646 bool do_demangle()1647 do_demangle() const 1648 { return this->do_demangle_; } 1649 1650 // Returns TRUE if any plugin libraries have been loaded. 1651 bool has_plugins()1652 has_plugins() const 1653 { return this->plugins_ != NULL; } 1654 1655 // Return a pointer to the plugin manager. 1656 Plugin_manager* plugins()1657 plugins() const 1658 { return this->plugins_; } 1659 1660 // True iff SYMBOL was found in the file specified by dynamic-list. 1661 bool in_dynamic_list(const char * symbol)1662 in_dynamic_list(const char* symbol) const 1663 { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); } 1664 1665 // True if a --dynamic-list script was provided. 1666 bool have_dynamic_list()1667 have_dynamic_list() const 1668 { return this->have_dynamic_list_; } 1669 1670 // Finalize the dynamic list. 1671 void finalize_dynamic_list()1672 finalize_dynamic_list() 1673 { this->dynamic_list_.version_script_info()->finalize(); } 1674 1675 // The mode selected by the --incremental options. 1676 enum Incremental_mode 1677 { 1678 // No incremental linking (--no-incremental). 1679 INCREMENTAL_OFF, 1680 // Incremental update only (--incremental-update). 1681 INCREMENTAL_UPDATE, 1682 // Force a full link, but prepare for subsequent incremental link 1683 // (--incremental-full). 1684 INCREMENTAL_FULL, 1685 // Incremental update if possible, fallback to full link (--incremental). 1686 INCREMENTAL_AUTO 1687 }; 1688 1689 // The incremental linking mode. 1690 Incremental_mode incremental_mode()1691 incremental_mode() const 1692 { return this->incremental_mode_; } 1693 1694 // The disposition given by the --incremental-changed, 1695 // --incremental-unchanged or --incremental-unknown option. The 1696 // value may change as we proceed parsing the command line flags. 1697 Incremental_disposition incremental_disposition()1698 incremental_disposition() const 1699 { return this->incremental_disposition_; } 1700 1701 void set_incremental_disposition(Incremental_disposition disp)1702 set_incremental_disposition(Incremental_disposition disp) 1703 { this->incremental_disposition_ = disp; } 1704 1705 // The disposition to use for startup files (those that precede the 1706 // first --incremental-changed, etc. option). 1707 Incremental_disposition incremental_startup_disposition()1708 incremental_startup_disposition() const 1709 { return this->incremental_startup_disposition_; } 1710 1711 // Return true if S is the name of a library excluded from automatic 1712 // symbol export. 1713 bool 1714 check_excluded_libs(const std::string &s) const; 1715 1716 // If an explicit start address was given for section SECNAME with 1717 // the --section-start option, return true and set *PADDR to the 1718 // address. Otherwise return false. 1719 bool 1720 section_start(const char* secname, uint64_t* paddr) const; 1721 1722 // Return whether any --section-start option was used. 1723 bool any_section_start()1724 any_section_start() const 1725 { return !this->section_starts_.empty(); } 1726 1727 enum Fix_v4bx 1728 { 1729 // Leave original instruction. 1730 FIX_V4BX_NONE, 1731 // Replace instruction. 1732 FIX_V4BX_REPLACE, 1733 // Generate an interworking veneer. 1734 FIX_V4BX_INTERWORKING 1735 }; 1736 1737 Fix_v4bx fix_v4bx()1738 fix_v4bx() const 1739 { return (this->fix_v4bx_); } 1740 1741 enum Endianness 1742 { 1743 ENDIANNESS_NOT_SET, 1744 ENDIANNESS_BIG, 1745 ENDIANNESS_LITTLE 1746 }; 1747 1748 Endianness endianness()1749 endianness() const 1750 { return this->endianness_; } 1751 1752 enum Bsymbolic_kind 1753 { 1754 BSYMBOLIC_NONE, 1755 BSYMBOLIC_FUNCTIONS, 1756 BSYMBOLIC_ALL, 1757 }; 1758 1759 bool Bsymbolic()1760 Bsymbolic() const 1761 { return this->bsymbolic_ == BSYMBOLIC_ALL; } 1762 1763 bool Bsymbolic_functions()1764 Bsymbolic_functions() const 1765 { return this->bsymbolic_ == BSYMBOLIC_FUNCTIONS; } 1766 1767 bool discard_all()1768 discard_all() const 1769 { return this->discard_locals_ == DISCARD_ALL; } 1770 1771 bool discard_locals()1772 discard_locals() const 1773 { return this->discard_locals_ == DISCARD_LOCALS; } 1774 1775 bool discard_sec_merge()1776 discard_sec_merge() const 1777 { return this->discard_locals_ == DISCARD_SEC_MERGE; } 1778 1779 enum Orphan_handling 1780 { 1781 // Place orphan sections normally (default). 1782 ORPHAN_PLACE, 1783 // Discard all orphan sections. 1784 ORPHAN_DISCARD, 1785 // Warn when placing orphan sections. 1786 ORPHAN_WARN, 1787 // Issue error for orphan sections. 1788 ORPHAN_ERROR 1789 }; 1790 1791 Orphan_handling orphan_handling_enum()1792 orphan_handling_enum() const 1793 { return this->orphan_handling_enum_; } 1794 1795 elfcpp::STV start_stop_visibility_enum()1796 start_stop_visibility_enum() const 1797 { return this->start_stop_visibility_enum_; } 1798 1799 enum Power10_stubs 1800 { 1801 // Use Power10 insns on @notoc calls/branches, non-Power10 elsewhere. 1802 POWER10_STUBS_AUTO, 1803 // Don't use Power10 insns 1804 POWER10_STUBS_NO, 1805 // Always use Power10 insns 1806 POWER10_STUBS_YES 1807 }; 1808 1809 Power10_stubs power10_stubs_enum()1810 power10_stubs_enum() const 1811 { return this->power10_stubs_enum_; } 1812 1813 private: 1814 // Don't copy this structure. 1815 General_options(const General_options&); 1816 General_options& operator=(const General_options&); 1817 1818 // What local symbols to discard. 1819 enum Discard_locals 1820 { 1821 // Locals in merge sections (default). 1822 DISCARD_SEC_MERGE, 1823 // None (--discard-none). 1824 DISCARD_NONE, 1825 // Temporary locals (--discard-locals/-X). 1826 DISCARD_LOCALS, 1827 // All locals (--discard-all/-x). 1828 DISCARD_ALL 1829 }; 1830 1831 // Whether to mark the stack as executable. 1832 enum Execstack 1833 { 1834 // Not set on command line. 1835 EXECSTACK_FROM_INPUT, 1836 // Mark the stack as executable (-z execstack). 1837 EXECSTACK_YES, 1838 // Mark the stack as not executable (-z noexecstack). 1839 EXECSTACK_NO 1840 }; 1841 1842 enum Icf_status 1843 { 1844 // Do not fold any functions (Default or --icf=none). 1845 ICF_NONE, 1846 // All functions are candidates for folding. (--icf=all). 1847 ICF_ALL, 1848 // Only ctors and dtors are candidates for folding. (--icf=safe). 1849 ICF_SAFE 1850 }; 1851 1852 void set_icf_status(Icf_status value)1853 set_icf_status(Icf_status value) 1854 { this->icf_status_ = value; } 1855 1856 void set_execstack_status(Execstack value)1857 set_execstack_status(Execstack value) 1858 { this->execstack_status_ = value; } 1859 1860 void set_do_demangle(bool value)1861 set_do_demangle(bool value) 1862 { this->do_demangle_ = value; } 1863 1864 void set_static(bool value)1865 set_static(bool value) 1866 { static_ = value; } 1867 1868 void set_orphan_handling_enum(Orphan_handling value)1869 set_orphan_handling_enum(Orphan_handling value) 1870 { this->orphan_handling_enum_ = value; } 1871 1872 void set_start_stop_visibility_enum(elfcpp::STV value)1873 set_start_stop_visibility_enum(elfcpp::STV value) 1874 { this->start_stop_visibility_enum_ = value; } 1875 1876 void set_power10_stubs_enum(Power10_stubs value)1877 set_power10_stubs_enum(Power10_stubs value) 1878 { this->power10_stubs_enum_ = value; } 1879 1880 // These are called by finalize() to set up the search-path correctly. 1881 void add_to_library_path_with_sysroot(const std::string & arg)1882 add_to_library_path_with_sysroot(const std::string& arg) 1883 { this->add_search_directory_to_library_path(Search_directory(arg, true)); } 1884 1885 // Apply any sysroot to the directory lists. 1886 void 1887 add_sysroot(); 1888 1889 // Add a plugin and its arguments to the list of plugins. 1890 void 1891 add_plugin(const char* filename); 1892 1893 // Add a plugin option. 1894 void 1895 add_plugin_option(const char* opt); 1896 1897 void 1898 copy_from_posdep_options(const Position_dependent_options&); 1899 1900 // Whether we bind default visibility defined symbols locally for -shared. 1901 Bsymbolic_kind bsymbolic_; 1902 // Whether we printed version information. 1903 bool printed_version_; 1904 // Whether to mark the stack as executable. 1905 Execstack execstack_status_; 1906 // Whether to do code folding. 1907 Icf_status icf_status_; 1908 // Whether to do a static link. 1909 bool static_; 1910 // Whether to do demangling. 1911 bool do_demangle_; 1912 // List of plugin libraries. 1913 Plugin_manager* plugins_; 1914 // The parsed output of --dynamic-list files. For convenience in 1915 // script.cc, we store this as a Script_options object, even though 1916 // we only use a single Version_tree from it. 1917 Script_options dynamic_list_; 1918 // Whether a --dynamic-list file was provided. 1919 bool have_dynamic_list_; 1920 // The incremental linking mode. 1921 Incremental_mode incremental_mode_; 1922 // The disposition given by the --incremental-changed, 1923 // --incremental-unchanged or --incremental-unknown option. The 1924 // value may change as we proceed parsing the command line flags. 1925 Incremental_disposition incremental_disposition_; 1926 // The disposition to use for startup files (those marked 1927 // INCREMENTAL_STARTUP). 1928 Incremental_disposition incremental_startup_disposition_; 1929 // Whether we have seen one of the options that require incremental 1930 // build (--incremental-changed, --incremental-unchanged, 1931 // --incremental-unknown, or --incremental-startup-unchanged). 1932 bool implicit_incremental_; 1933 // Libraries excluded from automatic export, via --exclude-libs. 1934 Unordered_set<std::string> excluded_libs_; 1935 // List of symbol-names to keep, via -retain-symbol-info. 1936 Unordered_set<std::string> symbols_to_retain_; 1937 // Map from section name to address from --section-start. 1938 std::map<std::string, uint64_t> section_starts_; 1939 // Whether to process armv4 bx instruction relocation. 1940 Fix_v4bx fix_v4bx_; 1941 // Endianness. 1942 Endianness endianness_; 1943 // What local symbols to discard. 1944 Discard_locals discard_locals_; 1945 // Stack of saved options for --push-state/--pop-state. 1946 std::vector<Position_dependent_options*> options_stack_; 1947 // Orphan handling option, decoded to an enum value. 1948 Orphan_handling orphan_handling_enum_; 1949 // Symbol visibility for __start_* / __stop_* magic symbols. 1950 elfcpp::STV start_stop_visibility_enum_; 1951 // Power10 stubs option 1952 Power10_stubs power10_stubs_enum_; 1953 }; 1954 1955 // The position-dependent options. We use this to store the state of 1956 // the commandline at a particular point in parsing for later 1957 // reference. For instance, if we see "ld --whole-archive foo.a 1958 // --no-whole-archive," we want to store the whole-archive option with 1959 // foo.a, so when the time comes to parse foo.a we know we should do 1960 // it in whole-archive mode. We could store all of General_options, 1961 // but that's big, so we just pick the subset of flags that actually 1962 // change in a position-dependent way. 1963 1964 #define DEFINE_posdep(varname__, type__) \ 1965 public: \ 1966 type__ \ 1967 varname__() const \ 1968 { return this->varname__##_; } \ 1969 \ 1970 void \ 1971 set_##varname__(type__ value) \ 1972 { this->varname__##_ = value; } \ 1973 private: \ 1974 type__ varname__##_ 1975 1976 class Position_dependent_options 1977 { 1978 public: 1979 Position_dependent_options(const General_options& options 1980 = Position_dependent_options::default_options_) 1981 { copy_from_options(options); } 1982 1983 void copy_from_options(const General_options & options)1984 copy_from_options(const General_options& options) 1985 { 1986 this->set_as_needed(options.as_needed()); 1987 this->set_Bdynamic(options.Bdynamic()); 1988 this->set_format_enum(options.format_enum()); 1989 this->set_whole_archive(options.whole_archive()); 1990 this->set_incremental_disposition(options.incremental_disposition()); 1991 } 1992 1993 DEFINE_posdep(as_needed, bool); 1994 DEFINE_posdep(Bdynamic, bool); 1995 DEFINE_posdep(format_enum, General_options::Object_format); 1996 DEFINE_posdep(whole_archive, bool); 1997 DEFINE_posdep(incremental_disposition, Incremental_disposition); 1998 1999 private: 2000 // This is a General_options with everything set to its default 2001 // value. A Position_dependent_options created with no argument 2002 // will take its values from here. 2003 static General_options default_options_; 2004 }; 2005 2006 2007 // A single file or library argument from the command line. 2008 2009 class Input_file_argument 2010 { 2011 public: 2012 enum Input_file_type 2013 { 2014 // A regular file, name used as-is, not searched. 2015 INPUT_FILE_TYPE_FILE, 2016 // A library name. When used, "lib" will be prepended and ".so" or 2017 // ".a" appended to make a filename, and that filename will be searched 2018 // for using the -L paths. 2019 INPUT_FILE_TYPE_LIBRARY, 2020 // A regular file, name used as-is, but searched using the -L paths. 2021 INPUT_FILE_TYPE_SEARCHED_FILE 2022 }; 2023 2024 // name: file name or library name 2025 // type: the type of this input file. 2026 // extra_search_path: an extra directory to look for the file, prior 2027 // to checking the normal library search path. If this is "", 2028 // then no extra directory is added. 2029 // just_symbols: whether this file only defines symbols. 2030 // options: The position dependent options at this point in the 2031 // command line, such as --whole-archive. Input_file_argument()2032 Input_file_argument() 2033 : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""), 2034 just_symbols_(false), options_(), arg_serial_(0) 2035 { } 2036 Input_file_argument(const char * name,Input_file_type type,const char * extra_search_path,bool just_symbols,const Position_dependent_options & options)2037 Input_file_argument(const char* name, Input_file_type type, 2038 const char* extra_search_path, 2039 bool just_symbols, 2040 const Position_dependent_options& options) 2041 : name_(name), type_(type), extra_search_path_(extra_search_path), 2042 just_symbols_(just_symbols), options_(options), arg_serial_(0) 2043 { } 2044 2045 // You can also pass in a General_options instance instead of a 2046 // Position_dependent_options. In that case, we extract the 2047 // position-independent vars from the General_options and only store 2048 // those. Input_file_argument(const char * name,Input_file_type type,const char * extra_search_path,bool just_symbols,const General_options & options)2049 Input_file_argument(const char* name, Input_file_type type, 2050 const char* extra_search_path, 2051 bool just_symbols, 2052 const General_options& options) 2053 : name_(name), type_(type), extra_search_path_(extra_search_path), 2054 just_symbols_(just_symbols), options_(options), arg_serial_(0) 2055 { } 2056 2057 const char* name()2058 name() const 2059 { return this->name_.c_str(); } 2060 2061 const Position_dependent_options& options()2062 options() const 2063 { return this->options_; } 2064 2065 bool is_lib()2066 is_lib() const 2067 { return type_ == INPUT_FILE_TYPE_LIBRARY; } 2068 2069 bool is_searched_file()2070 is_searched_file() const 2071 { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; } 2072 2073 const char* extra_search_path()2074 extra_search_path() const 2075 { 2076 return (this->extra_search_path_.empty() 2077 ? NULL 2078 : this->extra_search_path_.c_str()); 2079 } 2080 2081 // Return whether we should only read symbols from this file. 2082 bool just_symbols()2083 just_symbols() const 2084 { return this->just_symbols_; } 2085 2086 // Return whether this file may require a search using the -L 2087 // options. 2088 bool may_need_search()2089 may_need_search() const 2090 { 2091 return (this->is_lib() 2092 || this->is_searched_file() 2093 || !this->extra_search_path_.empty()); 2094 } 2095 2096 // Set the serial number for this argument. 2097 void set_arg_serial(unsigned int arg_serial)2098 set_arg_serial(unsigned int arg_serial) 2099 { this->arg_serial_ = arg_serial; } 2100 2101 // Get the serial number. 2102 unsigned int arg_serial()2103 arg_serial() const 2104 { return this->arg_serial_; } 2105 2106 private: 2107 // We use std::string, not const char*, here for convenience when 2108 // using script files, so that we do not have to preserve the string 2109 // in that case. 2110 std::string name_; 2111 Input_file_type type_; 2112 std::string extra_search_path_; 2113 bool just_symbols_; 2114 Position_dependent_options options_; 2115 // A unique index for this file argument in the argument list. 2116 unsigned int arg_serial_; 2117 }; 2118 2119 // A file or library, or a group, from the command line. 2120 2121 class Input_argument 2122 { 2123 public: 2124 // Create a file or library argument. Input_argument(Input_file_argument file)2125 explicit Input_argument(Input_file_argument file) 2126 : is_file_(true), file_(file), group_(NULL), lib_(NULL), script_info_(NULL) 2127 { } 2128 2129 // Create a group argument. Input_argument(Input_file_group * group)2130 explicit Input_argument(Input_file_group* group) 2131 : is_file_(false), group_(group), lib_(NULL), script_info_(NULL) 2132 { } 2133 2134 // Create a lib argument. Input_argument(Input_file_lib * lib)2135 explicit Input_argument(Input_file_lib* lib) 2136 : is_file_(false), group_(NULL), lib_(lib), script_info_(NULL) 2137 { } 2138 2139 // Return whether this is a file. 2140 bool is_file()2141 is_file() const 2142 { return this->is_file_; } 2143 2144 // Return whether this is a group. 2145 bool is_group()2146 is_group() const 2147 { return !this->is_file_ && this->lib_ == NULL; } 2148 2149 // Return whether this is a lib. 2150 bool is_lib()2151 is_lib() const 2152 { return this->lib_ != NULL; } 2153 2154 // Return the information about the file. 2155 const Input_file_argument& file()2156 file() const 2157 { 2158 gold_assert(this->is_file_); 2159 return this->file_; 2160 } 2161 2162 // Return the information about the group. 2163 const Input_file_group* group()2164 group() const 2165 { 2166 gold_assert(!this->is_file_); 2167 return this->group_; 2168 } 2169 2170 Input_file_group* group()2171 group() 2172 { 2173 gold_assert(!this->is_file_); 2174 return this->group_; 2175 } 2176 2177 // Return the information about the lib. 2178 const Input_file_lib* lib()2179 lib() const 2180 { 2181 gold_assert(!this->is_file_); 2182 gold_assert(this->lib_); 2183 return this->lib_; 2184 } 2185 2186 Input_file_lib* lib()2187 lib() 2188 { 2189 gold_assert(!this->is_file_); 2190 gold_assert(this->lib_); 2191 return this->lib_; 2192 } 2193 2194 // If a script generated this argument, store a pointer to the script info. 2195 // Currently used only for recording incremental link information. 2196 void set_script_info(Script_info * info)2197 set_script_info(Script_info* info) 2198 { this->script_info_ = info; } 2199 2200 Script_info* script_info()2201 script_info() const 2202 { return this->script_info_; } 2203 2204 private: 2205 bool is_file_; 2206 Input_file_argument file_; 2207 Input_file_group* group_; 2208 Input_file_lib* lib_; 2209 Script_info* script_info_; 2210 }; 2211 2212 typedef std::vector<Input_argument> Input_argument_list; 2213 2214 // A group from the command line. This is a set of arguments within 2215 // --start-group ... --end-group. 2216 2217 class Input_file_group 2218 { 2219 public: 2220 typedef Input_argument_list::const_iterator const_iterator; 2221 Input_file_group()2222 Input_file_group() 2223 : files_() 2224 { } 2225 2226 // Add a file to the end of the group. 2227 Input_argument& add_file(const Input_file_argument & arg)2228 add_file(const Input_file_argument& arg) 2229 { 2230 this->files_.push_back(Input_argument(arg)); 2231 return this->files_.back(); 2232 } 2233 2234 // Iterators to iterate over the group contents. 2235 2236 const_iterator begin()2237 begin() const 2238 { return this->files_.begin(); } 2239 2240 const_iterator end()2241 end() const 2242 { return this->files_.end(); } 2243 2244 private: 2245 Input_argument_list files_; 2246 }; 2247 2248 // A lib from the command line. This is a set of arguments within 2249 // --start-lib ... --end-lib. 2250 2251 class Input_file_lib 2252 { 2253 public: 2254 typedef Input_argument_list::const_iterator const_iterator; 2255 Input_file_lib(const Position_dependent_options & options)2256 Input_file_lib(const Position_dependent_options& options) 2257 : files_(), options_(options) 2258 { } 2259 2260 // Add a file to the end of the lib. 2261 Input_argument& add_file(const Input_file_argument & arg)2262 add_file(const Input_file_argument& arg) 2263 { 2264 this->files_.push_back(Input_argument(arg)); 2265 return this->files_.back(); 2266 } 2267 2268 const Position_dependent_options& options()2269 options() const 2270 { return this->options_; } 2271 2272 // Iterators to iterate over the lib contents. 2273 2274 const_iterator begin()2275 begin() const 2276 { return this->files_.begin(); } 2277 2278 const_iterator end()2279 end() const 2280 { return this->files_.end(); } 2281 2282 size_t size()2283 size() const 2284 { return this->files_.size(); } 2285 2286 private: 2287 Input_argument_list files_; 2288 Position_dependent_options options_; 2289 }; 2290 2291 // A list of files from the command line or a script. 2292 2293 class Input_arguments 2294 { 2295 public: 2296 typedef Input_argument_list::const_iterator const_iterator; 2297 Input_arguments()2298 Input_arguments() 2299 : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0) 2300 { } 2301 2302 // Add a file. 2303 Input_argument& 2304 add_file(Input_file_argument& arg); 2305 2306 // Start a group (the --start-group option). 2307 void 2308 start_group(); 2309 2310 // End a group (the --end-group option). 2311 void 2312 end_group(); 2313 2314 // Start a lib (the --start-lib option). 2315 void 2316 start_lib(const Position_dependent_options&); 2317 2318 // End a lib (the --end-lib option). 2319 void 2320 end_lib(); 2321 2322 // Return whether we are currently in a group. 2323 bool in_group()2324 in_group() const 2325 { return this->in_group_; } 2326 2327 // Return whether we are currently in a lib. 2328 bool in_lib()2329 in_lib() const 2330 { return this->in_lib_; } 2331 2332 // The number of entries in the list. 2333 int size()2334 size() const 2335 { return this->input_argument_list_.size(); } 2336 2337 // Iterators to iterate over the list of input files. 2338 2339 const_iterator begin()2340 begin() const 2341 { return this->input_argument_list_.begin(); } 2342 2343 const_iterator end()2344 end() const 2345 { return this->input_argument_list_.end(); } 2346 2347 // Return whether the list is empty. 2348 bool empty()2349 empty() const 2350 { return this->input_argument_list_.empty(); } 2351 2352 // Return the number of input files. This may be larger than 2353 // input_argument_list_.size(), because of files that are part 2354 // of groups or libs. 2355 int number_of_input_files()2356 number_of_input_files() const 2357 { return this->file_count_; } 2358 2359 private: 2360 Input_argument_list input_argument_list_; 2361 bool in_group_; 2362 bool in_lib_; 2363 unsigned int file_count_; 2364 }; 2365 2366 2367 // All the information read from the command line. These are held in 2368 // three separate structs: one to hold the options (--foo), one to 2369 // hold the filenames listed on the commandline, and one to hold 2370 // linker script information. This third is not a subset of the other 2371 // two because linker scripts can be specified either as options (via 2372 // -T) or as a file. 2373 2374 class Command_line 2375 { 2376 public: 2377 typedef Input_arguments::const_iterator const_iterator; 2378 2379 Command_line(); 2380 2381 // Process the command line options. This will exit with an 2382 // appropriate error message if an unrecognized option is seen. 2383 void 2384 process(int argc, const char** argv); 2385 2386 // Process one command-line option. This takes the index of argv to 2387 // process, and returns the index for the next option. no_more_options 2388 // is set to true if argv[i] is "--". 2389 int 2390 process_one_option(int argc, const char** argv, int i, 2391 bool* no_more_options); 2392 2393 // Get the general options. 2394 const General_options& options()2395 options() const 2396 { return this->options_; } 2397 2398 // Get the position dependent options. 2399 const Position_dependent_options& position_dependent_options()2400 position_dependent_options() const 2401 { return this->position_options_; } 2402 2403 // Get the linker-script options. 2404 Script_options& script_options()2405 script_options() 2406 { return this->script_options_; } 2407 2408 // Finalize the version-script options and return them. 2409 const Version_script_info& 2410 version_script(); 2411 2412 // Get the input files. 2413 Input_arguments& inputs()2414 inputs() 2415 { return this->inputs_; } 2416 2417 // The number of input files. 2418 int number_of_input_files()2419 number_of_input_files() const 2420 { return this->inputs_.number_of_input_files(); } 2421 2422 // Iterators to iterate over the list of input files. 2423 2424 const_iterator begin()2425 begin() const 2426 { return this->inputs_.begin(); } 2427 2428 const_iterator end()2429 end() const 2430 { return this->inputs_.end(); } 2431 2432 private: 2433 Command_line(const Command_line&); 2434 Command_line& operator=(const Command_line&); 2435 2436 // This is a dummy class to provide a constructor that runs before 2437 // the constructor for the General_options. The Pre_options constructor 2438 // is used as a hook to set the flag enabling the options to register 2439 // themselves. 2440 struct Pre_options { 2441 Pre_options(); 2442 }; 2443 2444 // This must come before options_! 2445 Pre_options pre_options_; 2446 General_options options_; 2447 Position_dependent_options position_options_; 2448 Script_options script_options_; 2449 Input_arguments inputs_; 2450 }; 2451 2452 } // End namespace gold. 2453 2454 #endif // !defined(GOLD_OPTIONS_H) 2455