1 // options.h -- handle command line options for gold -*- C++ -*- 2 3 // Copyright (C) 2006-2016 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 // A One_option struct initializes itself with the global list of options 158 // at constructor time, so be careful making one of these. 159 struct One_option 160 { 161 std::string longname; 162 Dashes dashes; 163 char shortname; 164 const char* default_value; 165 const char* helpstring; 166 const char* helparg; 167 bool optional_arg; 168 Struct_var* reader; 169 170 One_option(const char* ln, Dashes d, char sn, const char* dv, 171 const char* hs, const char* ha, bool oa, Struct_var* r) 172 : longname(ln), dashes(d), shortname(sn), default_value(dv ? dv : ""), 173 helpstring(hs), helparg(ha), optional_arg(oa), reader(r) 174 { 175 // In longname, we convert all underscores to dashes, since GNU 176 // style uses dashes in option names. longname is likely to have 177 // underscores in it because it's also used to declare a C++ 178 // function. 179 const char* pos = strchr(this->longname.c_str(), '_'); 180 for (; pos; pos = strchr(pos, '_')) 181 this->longname[pos - this->longname.c_str()] = '-'; 182 183 // We only register ourselves if our helpstring is not NULL. This 184 // is to support the "no-VAR" boolean variables, which we 185 // conditionally turn on by defining "no-VAR" help text. 186 if (this->helpstring) 187 this->register_option(); 188 } 189 190 // This option takes an argument iff helparg is not NULL. 191 bool 192 takes_argument() const 193 { return this->helparg != NULL; } 194 195 // Whether the argument is optional. 196 bool 197 takes_optional_argument() const 198 { return this->optional_arg; } 199 200 // Register this option with the global list of options. 201 void 202 register_option(); 203 204 // Print this option to stdout (used with --help). 205 void 206 print() const; 207 }; 208 209 // All options have a Struct_##varname that inherits from this and 210 // actually implements parse_to_value for that option. 211 struct Struct_var 212 { 213 // OPTION: the name of the option as specified on the commandline, 214 // including leading dashes, and any text following the option: 215 // "-O", "--defsym=mysym=0x1000", etc. 216 // ARG: the arg associated with this option, or NULL if the option 217 // takes no argument: "2", "mysym=0x1000", etc. 218 // CMDLINE: the global Command_line object. Used by DEFINE_special. 219 // OPTIONS: the global General_options object. Used by DEFINE_special. 220 virtual void 221 parse_to_value(const char* option, const char* arg, 222 Command_line* cmdline, General_options* options) = 0; 223 virtual 224 ~Struct_var() // To make gcc happy. 225 { } 226 }; 227 228 // This is for "special" options that aren't of any predefined type. 229 struct Struct_special : public Struct_var 230 { 231 // If you change this, change the parse-fn in DEFINE_special as well. 232 typedef void (General_options::*Parse_function)(const char*, const char*, 233 Command_line*); 234 Struct_special(const char* varname, Dashes dashes, char shortname, 235 Parse_function parse_function, 236 const char* helpstring, const char* helparg) 237 : option(varname, dashes, shortname, "", helpstring, helparg, false, this), 238 parse(parse_function) 239 { } 240 241 void parse_to_value(const char* option, const char* arg, 242 Command_line* cmdline, General_options* options) 243 { (options->*(this->parse))(option, arg, cmdline); } 244 245 One_option option; 246 Parse_function parse; 247 }; 248 249 } // End namespace options. 250 251 252 // These are helper macros use by DEFINE_uint64/etc below. 253 // This macro is used inside the General_options_ class, so defines 254 // var() and set_var() as General_options methods. Arguments as are 255 // for the constructor for One_option. param_type__ is the same as 256 // type__ for built-in types, and "const type__ &" otherwise. 257 // 258 // When we define the linker command option "assert", the macro argument 259 // varname__ of DEFINE_var below will be replaced by "assert". On Mac OSX 260 // assert.h is included implicitly by one of the library headers we use. To 261 // avoid unintended macro substitution of "assert()", we need to enclose 262 // varname__ with parenthese. 263 #define DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 264 default_value_as_string__, helpstring__, helparg__, \ 265 optional_arg__, type__, param_type__, parse_fn__) \ 266 public: \ 267 param_type__ \ 268 (varname__)() const \ 269 { return this->varname__##_.value; } \ 270 \ 271 bool \ 272 user_set_##varname__() const \ 273 { return this->varname__##_.user_set_via_option; } \ 274 \ 275 void \ 276 set_user_set_##varname__() \ 277 { this->varname__##_.user_set_via_option = true; } \ 278 \ 279 private: \ 280 struct Struct_##varname__ : public options::Struct_var \ 281 { \ 282 Struct_##varname__() \ 283 : option(#varname__, dashes__, shortname__, default_value_as_string__, \ 284 helpstring__, helparg__, optional_arg__, this), \ 285 user_set_via_option(false), value(default_value__) \ 286 { } \ 287 \ 288 void \ 289 parse_to_value(const char* option_name, const char* arg, \ 290 Command_line*, General_options*) \ 291 { \ 292 parse_fn__(option_name, arg, &this->value); \ 293 this->user_set_via_option = true; \ 294 } \ 295 \ 296 options::One_option option; \ 297 bool user_set_via_option; \ 298 type__ value; \ 299 }; \ 300 Struct_##varname__ varname__##_; \ 301 void \ 302 set_##varname__(param_type__ value) \ 303 { this->varname__##_.value = value; } 304 305 // These macros allow for easy addition of a new commandline option. 306 307 // If no_helpstring__ is not NULL, then in addition to creating 308 // VARNAME, we also create an option called no-VARNAME (or, for a -z 309 // option, noVARNAME). 310 #define DEFINE_bool(varname__, dashes__, shortname__, default_value__, \ 311 helpstring__, no_helpstring__) \ 312 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 313 default_value__ ? "true" : "false", helpstring__, NULL, \ 314 false, bool, bool, options::parse_bool) \ 315 struct Struct_no_##varname__ : public options::Struct_var \ 316 { \ 317 Struct_no_##varname__() : option((dashes__ == options::DASH_Z \ 318 ? "no" #varname__ \ 319 : "no-" #varname__), \ 320 dashes__, '\0', \ 321 default_value__ ? "false" : "true", \ 322 no_helpstring__, NULL, false, this) \ 323 { } \ 324 \ 325 void \ 326 parse_to_value(const char*, const char*, \ 327 Command_line*, General_options* options) \ 328 { \ 329 options->set_##varname__(false); \ 330 options->set_user_set_##varname__(); \ 331 } \ 332 \ 333 options::One_option option; \ 334 }; \ 335 Struct_no_##varname__ no_##varname__##_initializer_ 336 337 #define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \ 338 helpstring__, no_helpstring__) \ 339 DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \ 340 default_value__ ? "true" : "false", helpstring__, NULL, \ 341 false, bool, bool, options::parse_bool) \ 342 struct Struct_disable_##varname__ : public options::Struct_var \ 343 { \ 344 Struct_disable_##varname__() : option("disable-" #varname__, \ 345 dashes__, '\0', \ 346 default_value__ ? "false" : "true", \ 347 no_helpstring__, NULL, false, this) \ 348 { } \ 349 \ 350 void \ 351 parse_to_value(const char*, const char*, \ 352 Command_line*, General_options* options) \ 353 { options->set_enable_##varname__(false); } \ 354 \ 355 options::One_option option; \ 356 }; \ 357 Struct_disable_##varname__ disable_##varname__##_initializer_ 358 359 #define DEFINE_int(varname__, dashes__, shortname__, default_value__, \ 360 helpstring__, helparg__) \ 361 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 362 #default_value__, helpstring__, helparg__, false, \ 363 int, int, options::parse_int) 364 365 #define DEFINE_uint(varname__, dashes__, shortname__, default_value__, \ 366 helpstring__, helparg__) \ 367 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 368 #default_value__, helpstring__, helparg__, false, \ 369 int, int, options::parse_uint) 370 371 #define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \ 372 helpstring__, helparg__) \ 373 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 374 #default_value__, helpstring__, helparg__, false, \ 375 uint64_t, uint64_t, options::parse_uint64) 376 377 #define DEFINE_double(varname__, dashes__, shortname__, default_value__, \ 378 helpstring__, helparg__) \ 379 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 380 #default_value__, helpstring__, helparg__, false, \ 381 double, double, options::parse_double) 382 383 #define DEFINE_percent(varname__, dashes__, shortname__, default_value__, \ 384 helpstring__, helparg__) \ 385 DEFINE_var(varname__, dashes__, shortname__, default_value__ / 100.0, \ 386 #default_value__, helpstring__, helparg__, false, \ 387 double, double, options::parse_percent) 388 389 #define DEFINE_string(varname__, dashes__, shortname__, default_value__, \ 390 helpstring__, helparg__) \ 391 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 392 default_value__, helpstring__, helparg__, false, \ 393 const char*, const char*, options::parse_string) 394 395 // This is like DEFINE_string, but we convert each occurrence to a 396 // Search_directory and store it in a vector. Thus we also have the 397 // add_to_VARNAME() method, to append to the vector. 398 #define DEFINE_dirlist(varname__, dashes__, shortname__, \ 399 helpstring__, helparg__) \ 400 DEFINE_var(varname__, dashes__, shortname__, , \ 401 "", helpstring__, helparg__, false, options::Dir_list, \ 402 const options::Dir_list&, options::parse_dirlist) \ 403 void \ 404 add_to_##varname__(const char* new_value) \ 405 { options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \ 406 void \ 407 add_search_directory_to_##varname__(const Search_directory& dir) \ 408 { this->varname__##_.value.push_back(dir); } 409 410 // This is like DEFINE_string, but we store a set of strings. 411 #define DEFINE_set(varname__, dashes__, shortname__, \ 412 helpstring__, helparg__) \ 413 DEFINE_var(varname__, dashes__, shortname__, , \ 414 "", helpstring__, helparg__, false, options::String_set, \ 415 const options::String_set&, options::parse_set) \ 416 public: \ 417 bool \ 418 any_##varname__() const \ 419 { return !this->varname__##_.value.empty(); } \ 420 \ 421 bool \ 422 is_##varname__(const char* symbol) const \ 423 { \ 424 return (!this->varname__##_.value.empty() \ 425 && (this->varname__##_.value.find(std::string(symbol)) \ 426 != this->varname__##_.value.end())); \ 427 } \ 428 \ 429 options::String_set::const_iterator \ 430 varname__##_begin() const \ 431 { return this->varname__##_.value.begin(); } \ 432 \ 433 options::String_set::const_iterator \ 434 varname__##_end() const \ 435 { return this->varname__##_.value.end(); } 436 437 // When you have a list of possible values (expressed as string) 438 // After helparg__ should come an initializer list, like 439 // {"foo", "bar", "baz"} 440 #define DEFINE_enum(varname__, dashes__, shortname__, default_value__, \ 441 helpstring__, helparg__, ...) \ 442 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 443 default_value__, helpstring__, helparg__, false, \ 444 const char*, const char*, parse_choices_##varname__) \ 445 private: \ 446 static void parse_choices_##varname__(const char* option_name, \ 447 const char* arg, \ 448 const char** retval) { \ 449 const char* choices[] = __VA_ARGS__; \ 450 options::parse_choices(option_name, arg, retval, \ 451 choices, sizeof(choices) / sizeof(*choices)); \ 452 } 453 454 // This is like DEFINE_bool, but VARNAME is the name of a different 455 // option. This option becomes an alias for that one. INVERT is true 456 // if this option is an inversion of the other one. 457 #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__, \ 458 helpstring__, no_helpstring__, invert__) \ 459 private: \ 460 struct Struct_##option__ : public options::Struct_var \ 461 { \ 462 Struct_##option__() \ 463 : option(#option__, dashes__, shortname__, "", helpstring__, \ 464 NULL, false, this) \ 465 { } \ 466 \ 467 void \ 468 parse_to_value(const char*, const char*, \ 469 Command_line*, General_options* options) \ 470 { \ 471 options->set_##varname__(!invert__); \ 472 options->set_user_set_##varname__(); \ 473 } \ 474 \ 475 options::One_option option; \ 476 }; \ 477 Struct_##option__ option__##_; \ 478 \ 479 struct Struct_no_##option__ : public options::Struct_var \ 480 { \ 481 Struct_no_##option__() \ 482 : option((dashes__ == options::DASH_Z \ 483 ? "no" #option__ \ 484 : "no-" #option__), \ 485 dashes__, '\0', "", no_helpstring__, \ 486 NULL, false, this) \ 487 { } \ 488 \ 489 void \ 490 parse_to_value(const char*, const char*, \ 491 Command_line*, General_options* options) \ 492 { \ 493 options->set_##varname__(invert__); \ 494 options->set_user_set_##varname__(); \ 495 } \ 496 \ 497 options::One_option option; \ 498 }; \ 499 Struct_no_##option__ no_##option__##_initializer_ 500 501 // This is like DEFINE_uint64, but VARNAME is the name of a different 502 // option. This option becomes an alias for that one. 503 #define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \ 504 helpstring__, helparg__) \ 505 private: \ 506 struct Struct_##option__ : public options::Struct_var \ 507 { \ 508 Struct_##option__() \ 509 : option(#option__, dashes__, shortname__, "", helpstring__, \ 510 helparg__, false, this) \ 511 { } \ 512 \ 513 void \ 514 parse_to_value(const char* option_name, const char* arg, \ 515 Command_line*, General_options* options) \ 516 { \ 517 uint64_t value; \ 518 options::parse_uint64(option_name, arg, &value); \ 519 options->set_##varname__(value); \ 520 options->set_user_set_##varname__(); \ 521 } \ 522 \ 523 options::One_option option; \ 524 }; \ 525 Struct_##option__ option__##_; 526 527 // This is used for non-standard flags. It defines no functions; it 528 // just calls General_options::parse_VARNAME whenever the flag is 529 // seen. We declare parse_VARNAME as a static member of 530 // General_options; you are responsible for defining it there. 531 // helparg__ should be NULL iff this special-option is a boolean. 532 #define DEFINE_special(varname__, dashes__, shortname__, \ 533 helpstring__, helparg__) \ 534 private: \ 535 void parse_##varname__(const char* option, const char* arg, \ 536 Command_line* inputs); \ 537 struct Struct_##varname__ : public options::Struct_special \ 538 { \ 539 Struct_##varname__() \ 540 : options::Struct_special(#varname__, dashes__, shortname__, \ 541 &General_options::parse_##varname__, \ 542 helpstring__, helparg__) \ 543 { } \ 544 }; \ 545 Struct_##varname__ varname__##_initializer_ 546 547 // An option that takes an optional string argument. If the option is 548 // used with no argument, the value will be the default, and 549 // user_set_via_option will be true. 550 #define DEFINE_optional_string(varname__, dashes__, shortname__, \ 551 default_value__, \ 552 helpstring__, helparg__) \ 553 DEFINE_var(varname__, dashes__, shortname__, default_value__, \ 554 default_value__, helpstring__, helparg__, true, \ 555 const char*, const char*, options::parse_optional_string) 556 557 // A directory to search. For each directory we record whether it is 558 // in the sysroot. We need to know this so that, if a linker script 559 // is found within the sysroot, we will apply the sysroot to any files 560 // named by that script. 561 562 class Search_directory 563 { 564 public: 565 // We need a default constructor because we put this in a 566 // std::vector. 567 Search_directory() 568 : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false) 569 { } 570 571 // This is the usual constructor. 572 Search_directory(const std::string& name, bool put_in_sysroot) 573 : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false) 574 { 575 if (this->name_.empty()) 576 this->name_ = "."; 577 } 578 579 // This is called if we have a sysroot. The sysroot is prefixed to 580 // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is 581 // set to true for any enries which are in the sysroot (this will 582 // naturally include any entries for which put_in_sysroot_ is true). 583 // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of 584 // passing SYSROOT to lrealpath. 585 void 586 add_sysroot(const char* sysroot, const char* canonical_sysroot); 587 588 // Get the directory name. 589 const std::string& 590 name() const 591 { return this->name_; } 592 593 // Return whether this directory is in the sysroot. 594 bool 595 is_in_sysroot() const 596 { return this->is_in_sysroot_; } 597 598 // Return whether this is considered a system directory. 599 bool 600 is_system_directory() const 601 { return this->put_in_sysroot_ || this->is_in_sysroot_; } 602 603 private: 604 // The directory name. 605 std::string name_; 606 // True if the sysroot should be added as a prefix for this 607 // directory (if there is a sysroot). This is true for system 608 // directories that we search by default. 609 bool put_in_sysroot_; 610 // True if this directory is in the sysroot (if there is a sysroot). 611 // This is true if there is a sysroot and either 1) put_in_sysroot_ 612 // is true, or 2) the directory happens to be in the sysroot based 613 // on a pathname comparison. 614 bool is_in_sysroot_; 615 }; 616 617 class General_options 618 { 619 private: 620 // NOTE: For every option that you add here, also consider if you 621 // should add it to Position_dependent_options. 622 DEFINE_special(help, options::TWO_DASHES, '\0', 623 N_("Report usage information"), NULL); 624 DEFINE_special(version, options::TWO_DASHES, 'v', 625 N_("Report version information"), NULL); 626 DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0', 627 N_("Report version and target information"), NULL); 628 629 // These options are sorted approximately so that for each letter in 630 // the alphabet, we show the option whose shortname is that letter 631 // (if any) and then every longname that starts with that letter (in 632 // alphabetical order). For both, lowercase sorts before uppercase. 633 // The -z options come last. 634 635 DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false, 636 N_("Not supported"), 637 N_("Do not copy DT_NEEDED tags from shared libraries")); 638 639 DEFINE_bool_alias(allow_multiple_definition, muldefs, options::TWO_DASHES, 640 '\0', N_("Allow multiple definitions of symbols"), 641 N_("Do not allow multiple definitions"), false); 642 643 DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false, 644 N_("Allow unresolved references in shared libraries"), 645 N_("Do not allow unresolved references in shared libraries")); 646 647 DEFINE_bool(apply_dynamic_relocs, options::TWO_DASHES, '\0', true, 648 N_("Apply link-time values for dynamic relocations (default)"), 649 N_("(aarch64 only) Do not apply link-time values " 650 "for dynamic relocations")); 651 652 DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false, 653 N_("Only set DT_NEEDED for shared libraries if used"), 654 N_("Always DT_NEEDED for shared libraries")); 655 656 DEFINE_enum(assert, options::ONE_DASH, '\0', NULL, 657 N_("Ignored"), N_("[ignored]"), 658 {"definitions", "nodefinitions", "nosymbolic", "pure-text"}); 659 660 // This should really be an "enum", but it's too easy for folks to 661 // forget to update the list as they add new targets. So we just 662 // accept any string. We'll fail later (when the string is parsed), 663 // if the target isn't actually supported. 664 DEFINE_string(format, options::TWO_DASHES, 'b', "elf", 665 N_("Set input format"), ("[elf,binary]")); 666 667 DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true, 668 N_("-l searches for shared libraries"), NULL); 669 DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0', 670 N_("-l does not search for shared libraries"), NULL, 671 true); 672 DEFINE_bool_alias(dy, Bdynamic, options::ONE_DASH, '\0', 673 N_("alias for -Bdynamic"), NULL, false); 674 DEFINE_bool_alias(dn, Bdynamic, options::ONE_DASH, '\0', 675 N_("alias for -Bstatic"), NULL, true); 676 677 DEFINE_bool(Bgroup, options::ONE_DASH, '\0', false, 678 N_("Use group name lookup rules for shared library"), NULL); 679 680 DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false, 681 N_("Bind defined symbols locally"), NULL); 682 683 DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false, 684 N_("Bind defined function symbols locally"), NULL); 685 686 DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "tree", 687 N_("Generate build ID note"), 688 N_("[=STYLE]")); 689 690 DEFINE_uint64(build_id_chunk_size_for_treehash, 691 options::TWO_DASHES, '\0', 2 << 20, 692 N_("Chunk size for '--build-id=tree'"), N_("SIZE")); 693 694 DEFINE_uint64(build_id_min_file_size_for_treehash, options::TWO_DASHES, 695 '\0', 40 << 20, 696 N_("Minimum output file size for '--build-id=tree' to work" 697 " differently than '--build-id=sha1'"), N_("SIZE")); 698 699 DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true, 700 N_("Check segment addresses for overlaps (default)"), 701 N_("Do not check segment addresses for overlaps")); 702 703 DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none", 704 N_("Compress .debug_* sections in the output file"), 705 ("[none,zlib,zlib-gnu,zlib-gabi]"), 706 {"none", "zlib", "zlib-gnu", "zlib-gabi"}); 707 708 DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false, 709 N_("Not supported"), 710 N_("Do not copy DT_NEEDED tags from shared libraries")); 711 712 DEFINE_bool(cref, options::TWO_DASHES, '\0', false, 713 N_("Output cross reference table"), 714 N_("Do not output cross reference table")); 715 716 DEFINE_bool(ctors_in_init_array, options::TWO_DASHES, '\0', true, 717 N_("Use DT_INIT_ARRAY for all constructors (default)"), 718 N_("Handle constructors as directed by compiler")); 719 720 DEFINE_bool(define_common, options::TWO_DASHES, 'd', false, 721 N_("Define common symbols"), 722 N_("Do not define common symbols")); 723 DEFINE_bool(dc, options::ONE_DASH, '\0', false, 724 N_("Alias for -d"), NULL); 725 DEFINE_bool(dp, options::ONE_DASH, '\0', false, 726 N_("Alias for -d"), NULL); 727 728 DEFINE_string(debug, options::TWO_DASHES, '\0', "", 729 N_("Turn on debugging"), 730 N_("[all,files,script,task][,...]")); 731 732 DEFINE_special(defsym, options::TWO_DASHES, '\0', 733 N_("Define a symbol"), N_("SYMBOL=EXPRESSION")); 734 735 DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL, 736 N_("Demangle C++ symbols in log messages"), 737 N_("[=STYLE]")); 738 739 DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false, 740 N_("Do not demangle C++ symbols in log messages"), 741 NULL); 742 743 DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false, 744 N_("Look for violations of the C++ One Definition Rule"), 745 N_("Do not look for violations of the C++ One Definition Rule")); 746 747 DEFINE_special(discard_all, options::TWO_DASHES, 'x', 748 N_("Delete all local symbols"), NULL); 749 DEFINE_special(discard_locals, options::TWO_DASHES, 'X', 750 N_("Delete all temporary local symbols"), NULL); 751 DEFINE_special(discard_none, options::TWO_DASHES, '\0', 752 N_("Keep all local symbols"), NULL); 753 754 DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false, 755 N_("Add data symbols to dynamic symbols"), NULL); 756 757 DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false, 758 N_("Add C++ operator new/delete to dynamic symbols"), NULL); 759 760 DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false, 761 N_("Add C++ typeinfo to dynamic symbols"), NULL); 762 763 DEFINE_special(dynamic_list, options::TWO_DASHES, '\0', 764 N_("Read a list of dynamic symbols"), N_("FILE")); 765 766 DEFINE_string(entry, options::TWO_DASHES, 'e', NULL, 767 N_("Set program start address"), N_("ADDRESS")); 768 769 DEFINE_special(exclude_libs, options::TWO_DASHES, '\0', 770 N_("Exclude libraries from automatic export"), 771 N_(("lib,lib ..."))); 772 773 DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false, 774 N_("Export all dynamic symbols"), 775 N_("Do not export all dynamic symbols (default)")); 776 777 DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0', 778 N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL")); 779 780 DEFINE_special(EB, options::ONE_DASH, '\0', 781 N_("Link big-endian objects."), NULL); 782 783 DEFINE_special(EL, options::ONE_DASH, '\0', 784 N_("Link little-endian objects."), NULL); 785 786 DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false, 787 N_("Create exception frame header"), NULL); 788 789 DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL, 790 N_("(ARM only) Do not warn about objects with incompatible " 791 "enum sizes")); 792 793 DEFINE_set(auxiliary, options::TWO_DASHES, 'f', 794 N_("Auxiliary filter for shared object symbol table"), 795 N_("SHLIB")); 796 797 DEFINE_string(filter, options::TWO_DASHES, 'F', NULL, 798 N_("Filter for shared object symbol table"), 799 N_("SHLIB")); 800 801 DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false, 802 N_("Treat warnings as errors"), 803 N_("Do not treat warnings as errors")); 804 805 DEFINE_string(fini, options::ONE_DASH, '\0', "_fini", 806 N_("Call SYMBOL at unload-time"), N_("SYMBOL")); 807 808 DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false, 809 N_("(ARM only) Fix binaries for Cortex-A8 erratum."), 810 N_("(ARM only) Do not fix binaries for Cortex-A8 erratum.")); 811 812 DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false, 813 N_("(AArch64 only) Fix Cortex-A53 erratum 843419."), 814 N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419.")); 815 816 DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false, 817 N_("(AArch64 only) Fix Cortex-A53 erratum 835769."), 818 N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769.")); 819 820 DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true, 821 N_("(ARM only) Fix binaries for ARM1176 erratum."), 822 N_("(ARM only) Do not fix binaries for ARM1176 erratum.")); 823 824 DEFINE_bool(merge_exidx_entries, options::TWO_DASHES, '\0', true, 825 N_("(ARM only) Merge exidx entries in debuginfo."), 826 N_("(ARM only) Do not merge exidx entries in debuginfo.")); 827 828 DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0', 829 N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"), 830 NULL); 831 832 DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0', 833 N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking " 834 "veneer"), 835 NULL); 836 837 DEFINE_bool(long_plt, options::TWO_DASHES, '\0', false, 838 N_("(ARM only) Generate long PLT entries"), 839 N_("(ARM only) Do not generate long PLT entries")); 840 841 DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false, 842 N_("Ignored"), NULL); 843 844 DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false, 845 N_("Generate .gdb_index section"), 846 N_("Do not generate .gdb_index section")); 847 848 DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true, 849 N_("Enable STB_GNU_UNIQUE symbol binding (default)"), 850 N_("Disable STB_GNU_UNIQUE symbol binding")); 851 852 DEFINE_string(soname, options::ONE_DASH, 'h', NULL, 853 N_("Set shared library name"), N_("FILENAME")); 854 855 DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0, 856 N_("Min fraction of empty buckets in dynamic hash"), 857 N_("FRACTION")); 858 859 DEFINE_enum(hash_style, options::TWO_DASHES, '\0', "sysv", 860 N_("Dynamic hash style"), N_("[sysv,gnu,both]"), 861 {"sysv", "gnu", "both"}); 862 863 DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL, 864 N_("Set dynamic linker path"), N_("PROGRAM")); 865 866 DEFINE_special(incremental, options::TWO_DASHES, '\0', 867 N_("Do an incremental link if possible; " 868 "otherwise, do a full link and prepare output " 869 "for incremental linking"), NULL); 870 871 DEFINE_special(no_incremental, options::TWO_DASHES, '\0', 872 N_("Do a full link (default)"), NULL); 873 874 DEFINE_special(incremental_full, options::TWO_DASHES, '\0', 875 N_("Do a full link and " 876 "prepare output for incremental linking"), NULL); 877 878 DEFINE_special(incremental_update, options::TWO_DASHES, '\0', 879 N_("Do an incremental link; exit if not possible"), NULL); 880 881 DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL, 882 N_("Set base file for incremental linking" 883 " (default is output file)"), 884 N_("FILE")); 885 886 DEFINE_special(incremental_changed, options::TWO_DASHES, '\0', 887 N_("Assume files changed"), NULL); 888 889 DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0', 890 N_("Assume files didn't change"), NULL); 891 892 DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0', 893 N_("Use timestamps to check files (default)"), NULL); 894 895 DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0', 896 N_("Assume startup files unchanged " 897 "(files preceding this option)"), NULL); 898 899 DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10, 900 N_("Amount of extra space to allocate for patches"), 901 N_("PERCENT")); 902 903 DEFINE_string(init, options::ONE_DASH, '\0', "_init", 904 N_("Call SYMBOL at load-time"), N_("SYMBOL")); 905 906 DEFINE_special(just_symbols, options::TWO_DASHES, '\0', 907 N_("Read only symbol values from FILE"), N_("FILE")); 908 909 DEFINE_bool(map_whole_files, options::TWO_DASHES, '\0', 910 sizeof(void*) >= 8, 911 N_("Map whole files to memory (default on 64-bit hosts)"), 912 N_("Map relevant file parts to memory (default on 32-bit " 913 "hosts)")); 914 DEFINE_bool(keep_files_mapped, options::TWO_DASHES, '\0', true, 915 N_("Keep files mapped across passes (default)"), 916 N_("Release mapped files after each pass")); 917 918 DEFINE_bool(ld_generated_unwind_info, options::TWO_DASHES, '\0', true, 919 N_("Generate unwind information for PLT (default)"), 920 N_("Do not generate unwind information for PLT")); 921 922 DEFINE_special(library, options::TWO_DASHES, 'l', 923 N_("Search for library LIBNAME"), N_("LIBNAME")); 924 925 DEFINE_dirlist(library_path, options::TWO_DASHES, 'L', 926 N_("Add directory to search path"), N_("DIR")); 927 928 DEFINE_bool(text_reorder, options::TWO_DASHES, '\0', true, 929 N_("Enable text section reordering for GCC section names " 930 "(default)"), 931 N_("Disable text section reordering for GCC section names")); 932 933 DEFINE_bool(nostdlib, options::ONE_DASH, '\0', false, 934 N_("Only search directories specified on the command line."), 935 NULL); 936 937 DEFINE_bool(rosegment, options::TWO_DASHES, '\0', false, 938 N_("Put read-only non-executable sections in their own segment"), 939 NULL); 940 941 DEFINE_uint64(rosegment_gap, options::TWO_DASHES, '\0', -1U, 942 N_("Set offset between executable and read-only segments"), 943 N_("OFFSET")); 944 945 DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "", 946 N_("Set GNU linker emulation; obsolete"), N_("EMULATION")); 947 948 DEFINE_bool(mmap_output_file, options::TWO_DASHES, '\0', true, 949 N_("Map the output file for writing (default)."), 950 N_("Do not map the output file for writing.")); 951 952 DEFINE_bool(print_map, options::TWO_DASHES, 'M', false, 953 N_("Write map file on standard output"), NULL); 954 DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"), 955 N_("MAPFILENAME")); 956 957 DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false, 958 N_("Do not page align data"), NULL); 959 DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false, 960 N_("Do not page align data, do not make text readonly"), 961 N_("Page align data, make text readonly")); 962 963 DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true, 964 N_("Enable use of DT_RUNPATH and DT_FLAGS"), 965 N_("Disable use of DT_RUNPATH and DT_FLAGS")); 966 967 DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false, 968 N_("Create an output file even if errors occur"), NULL); 969 970 DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0', 971 N_("Report undefined symbols (even with --shared)"), 972 NULL, false); 973 974 DEFINE_string(output, options::TWO_DASHES, 'o', "a.out", 975 N_("Set output file name"), N_("FILE")); 976 977 DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0, 978 N_("Optimize output file size"), N_("LEVEL")); 979 980 DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf", 981 N_("Set output format"), N_("[binary]")); 982 983 DEFINE_bool(p, options::ONE_DASH, '\0', false, 984 N_("(ARM only) Ignore for backward compatibility"), NULL); 985 986 DEFINE_bool(pie, options::ONE_DASH, '\0', false, 987 N_("Create a position independent executable"), 988 N_("Do not create a position independent executable")); 989 DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0', 990 N_("Create a position independent executable"), 991 N_("Do not create a position independent executable"), 992 false); 993 994 DEFINE_bool(pic_veneer, options::TWO_DASHES, '\0', false, 995 N_("Force PIC sequences for ARM/Thumb interworking veneers"), 996 NULL); 997 998 DEFINE_bool(pipeline_knowledge, options::ONE_DASH, '\0', false, 999 NULL, N_("(ARM only) Ignore for backward compatibility")); 1000 1001 DEFINE_var(plt_align, options::TWO_DASHES, '\0', 0, "5", 1002 N_("(PowerPC64 only) Align PLT call stubs to fit cache lines"), 1003 N_("[=P2ALIGN]"), true, int, int, options::parse_uint); 1004 1005 DEFINE_bool(plt_static_chain, options::TWO_DASHES, '\0', false, 1006 N_("(PowerPC64 only) PLT call stubs should load r11"), 1007 N_("(PowerPC64 only) PLT call stubs should not load r11")); 1008 1009 DEFINE_bool(plt_thread_safe, options::TWO_DASHES, '\0', false, 1010 N_("(PowerPC64 only) PLT call stubs with load-load barrier"), 1011 N_("(PowerPC64 only) PLT call stubs without barrier")); 1012 1013 #ifdef ENABLE_PLUGINS 1014 DEFINE_special(plugin, options::TWO_DASHES, '\0', 1015 N_("Load a plugin library"), N_("PLUGIN")); 1016 DEFINE_special(plugin_opt, options::TWO_DASHES, '\0', 1017 N_("Pass an option to the plugin"), N_("OPTION")); 1018 #endif 1019 1020 DEFINE_bool(posix_fallocate, options::TWO_DASHES, '\0', true, 1021 N_("Use posix_fallocate to reserve space in the output file" 1022 " (default)."), 1023 N_("Use fallocate or ftruncate to reserve space.")); 1024 1025 DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false, 1026 N_("Preread archive symbols when multi-threaded"), NULL); 1027 1028 DEFINE_bool(print_output_format, options::TWO_DASHES, '\0', false, 1029 N_("Print default output format"), NULL); 1030 1031 DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL, 1032 N_("Print symbols defined and used for each input"), 1033 N_("FILENAME")); 1034 1035 DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false, 1036 N_("Ignored for SVR4 compatibility"), NULL); 1037 1038 DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false, 1039 N_("Generate relocations in output"), NULL); 1040 1041 DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false, 1042 N_("Generate relocatable output"), NULL); 1043 DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0', 1044 N_("Synonym for -r"), NULL, false); 1045 1046 DEFINE_bool(relax, options::TWO_DASHES, '\0', false, 1047 N_("Relax branches on certain targets"), NULL); 1048 1049 DEFINE_string(retain_symbols_file, options::TWO_DASHES, '\0', NULL, 1050 N_("keep only symbols listed in this file"), N_("FILE")); 1051 1052 // -R really means -rpath, but can mean --just-symbols for 1053 // compatibility with GNU ld. -rpath is always -rpath, so we list 1054 // it separately. 1055 DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R', 1056 N_("Add DIR to runtime search path"), N_("DIR")); 1057 1058 DEFINE_dirlist(rpath, options::ONE_DASH, '\0', 1059 N_("Add DIR to runtime search path"), N_("DIR")); 1060 1061 DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0', 1062 N_("Add DIR to link time shared library search path"), 1063 N_("DIR")); 1064 1065 DEFINE_string(section_ordering_file, options::TWO_DASHES, '\0', NULL, 1066 N_("Layout sections in the order specified."), 1067 N_("FILENAME")); 1068 1069 DEFINE_special(section_start, options::TWO_DASHES, '\0', 1070 N_("Set address of section"), N_("SECTION=ADDRESS")); 1071 1072 DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL, 1073 N_("Sort common symbols by alignment"), 1074 N_("[={ascending,descending}]")); 1075 1076 DEFINE_enum(sort_section, options::TWO_DASHES, '\0', "none", 1077 N_("Sort sections by name. \'--no-text-reorder\'" 1078 " will override \'--sort-section=name\' for .text"), 1079 N_("[none,name]"), 1080 {"none", "name"}); 1081 1082 DEFINE_uint(spare_dynamic_tags, options::TWO_DASHES, '\0', 5, 1083 N_("Dynamic tag slots to reserve (default 5)"), 1084 N_("COUNT")); 1085 1086 DEFINE_bool(strip_all, options::TWO_DASHES, 's', false, 1087 N_("Strip all symbols"), NULL); 1088 DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false, 1089 N_("Strip debugging information"), NULL); 1090 DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false, 1091 N_("Emit only debug line number information"), NULL); 1092 DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false, 1093 N_("Strip debug symbols that are unused by gdb " 1094 "(at least versions <= 7.4)"), NULL); 1095 DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true, 1096 N_("Strip LTO intermediate code sections"), NULL); 1097 1098 DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1, 1099 N_("(ARM, PowerPC only) The maximum distance from instructions " 1100 "in a group of sections to their stubs. Negative values mean " 1101 "stubs are always after (PowerPC before) the group. 1 means " 1102 "use default size.\n"), 1103 N_("SIZE")); 1104 1105 DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false, 1106 N_("Use less memory and more disk I/O " 1107 "(included only for compatibility with GNU ld)"), NULL); 1108 1109 DEFINE_bool(shared, options::ONE_DASH, 'G', false, 1110 N_("Generate shared library"), NULL); 1111 1112 DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false, 1113 N_("Generate shared library"), NULL); 1114 1115 DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x4000, 1116 N_("Stack size when -fsplit-stack function calls non-split"), 1117 N_("SIZE")); 1118 1119 // This is not actually special in any way, but I need to give it 1120 // a non-standard accessor-function name because 'static' is a keyword. 1121 DEFINE_special(static, options::ONE_DASH, '\0', 1122 N_("Do not link against shared libraries"), NULL); 1123 1124 DEFINE_enum(icf, options::TWO_DASHES, '\0', "none", 1125 N_("Identical Code Folding. " 1126 "\'--icf=safe\' Folds ctors, dtors and functions whose" 1127 " pointers are definitely not taken."), 1128 ("[none,all,safe]"), 1129 {"none", "all", "safe"}); 1130 1131 DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0, 1132 N_("Number of iterations of ICF (default 2)"), N_("COUNT")); 1133 1134 DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false, 1135 N_("List folded identical sections on stderr"), 1136 N_("Do not list folded identical sections")); 1137 1138 DEFINE_set(keep_unique, options::TWO_DASHES, '\0', 1139 N_("Do not fold this symbol during ICF"), N_("SYMBOL")); 1140 1141 DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false, 1142 N_("Remove unused sections"), 1143 N_("Don't remove unused sections (default)")); 1144 1145 DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false, 1146 N_("List removed unused sections on stderr"), 1147 N_("Do not list removed unused sections")); 1148 1149 DEFINE_bool(stats, options::TWO_DASHES, '\0', false, 1150 N_("Print resource usage statistics"), NULL); 1151 1152 DEFINE_string(sysroot, options::TWO_DASHES, '\0', "", 1153 N_("Set target system root directory"), N_("DIR")); 1154 1155 DEFINE_bool(trace, options::TWO_DASHES, 't', false, 1156 N_("Print the name of each input file"), NULL); 1157 1158 DEFINE_special(script, options::TWO_DASHES, 'T', 1159 N_("Read linker script"), N_("FILE")); 1160 1161 DEFINE_bool(threads, options::TWO_DASHES, '\0', false, 1162 N_("Run the linker multi-threaded"), 1163 N_("Do not run the linker multi-threaded")); 1164 DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0, 1165 N_("Number of threads to use"), N_("COUNT")); 1166 DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0, 1167 N_("Number of threads to use in initial pass"), N_("COUNT")); 1168 DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0, 1169 N_("Number of threads to use in middle pass"), N_("COUNT")); 1170 DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0, 1171 N_("Number of threads to use in final pass"), N_("COUNT")); 1172 1173 DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U, 1174 N_("Set the address of the bss segment"), N_("ADDRESS")); 1175 DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U, 1176 N_("Set the address of the data segment"), N_("ADDRESS")); 1177 DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U, 1178 N_("Set the address of the text segment"), N_("ADDRESS")); 1179 DEFINE_uint64_alias(Ttext_segment, Ttext, options::ONE_DASH, '\0', 1180 N_("Set the address of the text segment"), 1181 N_("ADDRESS")); 1182 DEFINE_uint64(Trodata_segment, options::ONE_DASH, '\0', -1U, 1183 N_("Set the address of the rodata segment"), N_("ADDRESS")); 1184 1185 DEFINE_bool(toc_optimize, options::TWO_DASHES, '\0', true, 1186 N_("(PowerPC64 only) Optimize TOC code sequences"), 1187 N_("(PowerPC64 only) Don't optimize TOC code sequences")); 1188 1189 DEFINE_bool(toc_sort, options::TWO_DASHES, '\0', true, 1190 N_("(PowerPC64 only) Sort TOC and GOT sections"), 1191 N_("(PowerPC64 only) Don't sort TOC and GOT sections")); 1192 1193 DEFINE_set(undefined, options::TWO_DASHES, 'u', 1194 N_("Create undefined reference to SYMBOL"), N_("SYMBOL")); 1195 1196 DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL, 1197 N_("How to handle unresolved symbols"), 1198 ("ignore-all,report-all,ignore-in-object-files," 1199 "ignore-in-shared-libs"), 1200 {"ignore-all", "report-all", "ignore-in-object-files", 1201 "ignore-in-shared-libs"}); 1202 1203 DEFINE_bool(verbose, options::TWO_DASHES, '\0', false, 1204 N_("Synonym for --debug=files"), NULL); 1205 1206 DEFINE_special(version_script, options::TWO_DASHES, '\0', 1207 N_("Read version script"), N_("FILE")); 1208 1209 DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false, 1210 N_("Warn about duplicate common symbols"), 1211 N_("Do not warn about duplicate common symbols (default)")); 1212 1213 DEFINE_bool(warn_constructors, options::TWO_DASHES, '\0', false, 1214 N_("Ignored"), N_("Ignored")); 1215 1216 DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false, 1217 N_("Warn if the stack is executable"), 1218 N_("Do not warn if the stack is executable (default)")); 1219 1220 DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true, 1221 NULL, N_("Don't warn about mismatched input files")); 1222 1223 DEFINE_bool(warn_multiple_gp, options::TWO_DASHES, '\0', false, 1224 N_("Ignored"), NULL); 1225 1226 DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true, 1227 N_("Warn when skipping an incompatible library"), 1228 N_("Don't warn when skipping an incompatible library")); 1229 1230 DEFINE_bool(warn_shared_textrel, options::TWO_DASHES, '\0', false, 1231 N_("Warn if text segment is not shareable"), 1232 N_("Do not warn if text segment is not shareable (default)")); 1233 1234 DEFINE_bool(warn_unresolved_symbols, options::TWO_DASHES, '\0', false, 1235 N_("Report unresolved symbols as warnings"), 1236 NULL); 1237 DEFINE_bool_alias(error_unresolved_symbols, warn_unresolved_symbols, 1238 options::TWO_DASHES, '\0', 1239 N_("Report unresolved symbols as errors"), 1240 NULL, true); 1241 DEFINE_bool(weak_unresolved_symbols, options::TWO_DASHES, '\0', false, 1242 N_("Convert unresolved symbols to weak references"), 1243 NULL); 1244 1245 DEFINE_bool(wchar_size_warning, options::TWO_DASHES, '\0', true, NULL, 1246 N_("(ARM only) Do not warn about objects with incompatible " 1247 "wchar_t sizes")); 1248 1249 DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false, 1250 N_("Include all archive contents"), 1251 N_("Include only needed archive contents")); 1252 1253 DEFINE_set(wrap, options::TWO_DASHES, '\0', 1254 N_("Use wrapper functions for SYMBOL"), N_("SYMBOL")); 1255 1256 DEFINE_set(trace_symbol, options::TWO_DASHES, 'y', 1257 N_("Trace references to symbol"), N_("SYMBOL")); 1258 1259 DEFINE_bool(undefined_version, options::TWO_DASHES, '\0', true, 1260 N_("Allow unused version in script (default)"), 1261 N_("Do not allow unused version in script")); 1262 1263 DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "", 1264 N_("Default search path for Solaris compatibility"), 1265 N_("PATH")); 1266 1267 DEFINE_special(start_group, options::TWO_DASHES, '(', 1268 N_("Start a library search group"), NULL); 1269 DEFINE_special(end_group, options::TWO_DASHES, ')', 1270 N_("End a library search group"), NULL); 1271 1272 1273 DEFINE_special(start_lib, options::TWO_DASHES, '\0', 1274 N_("Start a library"), NULL); 1275 DEFINE_special(end_lib, options::TWO_DASHES, '\0', 1276 N_("End a library "), NULL); 1277 1278 DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "", 1279 N_("Ignored for GCC linker option compatibility"), 1280 ""); 1281 1282 // The -z options. 1283 1284 DEFINE_bool(combreloc, options::DASH_Z, '\0', true, 1285 N_("Sort dynamic relocs"), 1286 N_("Do not sort dynamic relocs")); 1287 DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0, 1288 N_("Set common page size to SIZE"), N_("SIZE")); 1289 DEFINE_bool(defs, options::DASH_Z, '\0', false, 1290 N_("Report undefined symbols (even with --shared)"), 1291 NULL); 1292 DEFINE_bool(execstack, options::DASH_Z, '\0', false, 1293 N_("Mark output as requiring executable stack"), NULL); 1294 DEFINE_bool(global, options::DASH_Z, '\0', false, 1295 N_("Make symbols in DSO available for subsequently loaded " 1296 "objects"), NULL); 1297 DEFINE_bool(initfirst, options::DASH_Z, '\0', false, 1298 N_("Mark DSO to be initialized first at runtime"), 1299 NULL); 1300 DEFINE_bool(interpose, options::DASH_Z, '\0', false, 1301 N_("Mark object to interpose all DSOs but executable"), 1302 NULL); 1303 DEFINE_bool_alias(lazy, now, options::DASH_Z, '\0', 1304 N_("Mark object for lazy runtime binding (default)"), 1305 NULL, true); 1306 DEFINE_bool(loadfltr, options::DASH_Z, '\0', false, 1307 N_("Mark object requiring immediate process"), 1308 NULL); 1309 DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0, 1310 N_("Set maximum page size to SIZE"), N_("SIZE")); 1311 DEFINE_bool(muldefs, options::DASH_Z, '\0', false, 1312 N_("Allow multiple definitions of symbols"), 1313 NULL); 1314 // copyreloc is here in the list because there is only -z 1315 // nocopyreloc, not -z copyreloc. 1316 DEFINE_bool(copyreloc, options::DASH_Z, '\0', true, 1317 NULL, 1318 N_("Do not create copy relocs")); 1319 DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false, 1320 N_("Mark object not to use default search paths"), 1321 NULL); 1322 DEFINE_bool(nodelete, options::DASH_Z, '\0', false, 1323 N_("Mark DSO non-deletable at runtime"), 1324 NULL); 1325 DEFINE_bool(nodlopen, options::DASH_Z, '\0', false, 1326 N_("Mark DSO not available to dlopen"), 1327 NULL); 1328 DEFINE_bool(nodump, options::DASH_Z, '\0', false, 1329 N_("Mark DSO not available to dldump"), 1330 NULL); 1331 DEFINE_bool(noexecstack, options::DASH_Z, '\0', false, 1332 N_("Mark output as not requiring executable stack"), NULL); 1333 DEFINE_bool(now, options::DASH_Z, '\0', false, 1334 N_("Mark object for immediate function binding"), 1335 NULL); 1336 DEFINE_bool(origin, options::DASH_Z, '\0', false, 1337 N_("Mark DSO to indicate that needs immediate $ORIGIN " 1338 "processing at runtime"), NULL); 1339 DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO, 1340 N_("Where possible mark variables read-only after relocation"), 1341 N_("Don't mark variables read-only after relocation")); 1342 DEFINE_bool(text, options::DASH_Z, '\0', false, 1343 N_("Do not permit relocations in read-only segments"), 1344 N_("Permit relocations in read-only segments (default)")); 1345 DEFINE_bool_alias(textoff, text, options::DASH_Z, '\0', 1346 N_("Permit relocations in read-only segments (default)"), 1347 NULL, true); 1348 1349 public: 1350 typedef options::Dir_list Dir_list; 1351 1352 General_options(); 1353 1354 // Does post-processing on flags, making sure they all have 1355 // non-conflicting values. Also converts some flags from their 1356 // "standard" types (string, etc), to another type (enum, DirList), 1357 // which can be accessed via a separate method. Dies if it notices 1358 // any problems. 1359 void finalize(); 1360 1361 // True if we printed the version information. 1362 bool 1363 printed_version() const 1364 { return this->printed_version_; } 1365 1366 // The macro defines output() (based on --output), but that's a 1367 // generic name. Provide this alternative name, which is clearer. 1368 const char* 1369 output_file_name() const 1370 { return this->output(); } 1371 1372 // This is not defined via a flag, but combines flags to say whether 1373 // the output is position-independent or not. 1374 bool 1375 output_is_position_independent() const 1376 { return this->shared() || this->pie(); } 1377 1378 // Return true if the output is something that can be exec()ed, such 1379 // as a static executable, or a position-dependent or 1380 // position-independent executable, but not a dynamic library or an 1381 // object file. 1382 bool 1383 output_is_executable() const 1384 { return !this->shared() && !this->relocatable(); } 1385 1386 // This would normally be static(), and defined automatically, but 1387 // since static is a keyword, we need to come up with our own name. 1388 bool 1389 is_static() const 1390 { return static_; } 1391 1392 // In addition to getting the input and output formats as a string 1393 // (via format() and oformat()), we also give access as an enum. 1394 enum Object_format 1395 { 1396 // Ordinary ELF. 1397 OBJECT_FORMAT_ELF, 1398 // Straight binary format. 1399 OBJECT_FORMAT_BINARY 1400 }; 1401 1402 // Convert a string to an Object_format. Gives an error if the 1403 // string is not recognized. 1404 static Object_format 1405 string_to_object_format(const char* arg); 1406 1407 // Note: these functions are not very fast. 1408 Object_format format_enum() const; 1409 Object_format oformat_enum() const; 1410 1411 // Return whether FILENAME is in a system directory. 1412 bool 1413 is_in_system_directory(const std::string& name) const; 1414 1415 // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_. 1416 bool 1417 should_retain_symbol(const char* symbol_name) const 1418 { 1419 if (symbols_to_retain_.empty()) // means flag wasn't specified 1420 return true; 1421 return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end(); 1422 } 1423 1424 // These are the best way to get access to the execstack state, 1425 // not execstack() and noexecstack() which are hard to use properly. 1426 bool 1427 is_execstack_set() const 1428 { return this->execstack_status_ != EXECSTACK_FROM_INPUT; } 1429 1430 bool 1431 is_stack_executable() const 1432 { return this->execstack_status_ == EXECSTACK_YES; } 1433 1434 bool 1435 icf_enabled() const 1436 { return this->icf_status_ != ICF_NONE; } 1437 1438 bool 1439 icf_safe_folding() const 1440 { return this->icf_status_ == ICF_SAFE; } 1441 1442 // The --demangle option takes an optional string, and there is also 1443 // a --no-demangle option. This is the best way to decide whether 1444 // to demangle or not. 1445 bool 1446 do_demangle() const 1447 { return this->do_demangle_; } 1448 1449 // Returns TRUE if any plugin libraries have been loaded. 1450 bool 1451 has_plugins() const 1452 { return this->plugins_ != NULL; } 1453 1454 // Return a pointer to the plugin manager. 1455 Plugin_manager* 1456 plugins() const 1457 { return this->plugins_; } 1458 1459 // True iff SYMBOL was found in the file specified by dynamic-list. 1460 bool 1461 in_dynamic_list(const char* symbol) const 1462 { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); } 1463 1464 // True if a --dynamic-list script was provided. 1465 bool 1466 have_dynamic_list() const 1467 { return this->have_dynamic_list_; } 1468 1469 // Finalize the dynamic list. 1470 void 1471 finalize_dynamic_list() 1472 { this->dynamic_list_.version_script_info()->finalize(); } 1473 1474 // The mode selected by the --incremental options. 1475 enum Incremental_mode 1476 { 1477 // No incremental linking (--no-incremental). 1478 INCREMENTAL_OFF, 1479 // Incremental update only (--incremental-update). 1480 INCREMENTAL_UPDATE, 1481 // Force a full link, but prepare for subsequent incremental link 1482 // (--incremental-full). 1483 INCREMENTAL_FULL, 1484 // Incremental update if possible, fallback to full link (--incremental). 1485 INCREMENTAL_AUTO 1486 }; 1487 1488 // The incremental linking mode. 1489 Incremental_mode 1490 incremental_mode() const 1491 { return this->incremental_mode_; } 1492 1493 // The disposition given by the --incremental-changed, 1494 // --incremental-unchanged or --incremental-unknown option. The 1495 // value may change as we proceed parsing the command line flags. 1496 Incremental_disposition 1497 incremental_disposition() const 1498 { return this->incremental_disposition_; } 1499 1500 // The disposition to use for startup files (those that precede the 1501 // first --incremental-changed, etc. option). 1502 Incremental_disposition 1503 incremental_startup_disposition() const 1504 { return this->incremental_startup_disposition_; } 1505 1506 // Return true if S is the name of a library excluded from automatic 1507 // symbol export. 1508 bool 1509 check_excluded_libs(const std::string &s) const; 1510 1511 // If an explicit start address was given for section SECNAME with 1512 // the --section-start option, return true and set *PADDR to the 1513 // address. Otherwise return false. 1514 bool 1515 section_start(const char* secname, uint64_t* paddr) const; 1516 1517 // Return whether any --section-start option was used. 1518 bool 1519 any_section_start() const 1520 { return !this->section_starts_.empty(); } 1521 1522 enum Fix_v4bx 1523 { 1524 // Leave original instruction. 1525 FIX_V4BX_NONE, 1526 // Replace instruction. 1527 FIX_V4BX_REPLACE, 1528 // Generate an interworking veneer. 1529 FIX_V4BX_INTERWORKING 1530 }; 1531 1532 Fix_v4bx 1533 fix_v4bx() const 1534 { return (this->fix_v4bx_); } 1535 1536 enum Endianness 1537 { 1538 ENDIANNESS_NOT_SET, 1539 ENDIANNESS_BIG, 1540 ENDIANNESS_LITTLE 1541 }; 1542 1543 Endianness 1544 endianness() const 1545 { return this->endianness_; } 1546 1547 bool 1548 discard_all() const 1549 { return this->discard_locals_ == DISCARD_ALL; } 1550 1551 bool 1552 discard_locals() const 1553 { return this->discard_locals_ == DISCARD_LOCALS; } 1554 1555 bool 1556 discard_sec_merge() const 1557 { return this->discard_locals_ == DISCARD_SEC_MERGE; } 1558 1559 private: 1560 // Don't copy this structure. 1561 General_options(const General_options&); 1562 General_options& operator=(const General_options&); 1563 1564 // What local symbols to discard. 1565 enum Discard_locals 1566 { 1567 // Locals in merge sections (default). 1568 DISCARD_SEC_MERGE, 1569 // None (--discard-none). 1570 DISCARD_NONE, 1571 // Temporary locals (--discard-locals/-X). 1572 DISCARD_LOCALS, 1573 // All locals (--discard-all/-x). 1574 DISCARD_ALL 1575 }; 1576 1577 // Whether to mark the stack as executable. 1578 enum Execstack 1579 { 1580 // Not set on command line. 1581 EXECSTACK_FROM_INPUT, 1582 // Mark the stack as executable (-z execstack). 1583 EXECSTACK_YES, 1584 // Mark the stack as not executable (-z noexecstack). 1585 EXECSTACK_NO 1586 }; 1587 1588 enum Icf_status 1589 { 1590 // Do not fold any functions (Default or --icf=none). 1591 ICF_NONE, 1592 // All functions are candidates for folding. (--icf=all). 1593 ICF_ALL, 1594 // Only ctors and dtors are candidates for folding. (--icf=safe). 1595 ICF_SAFE 1596 }; 1597 1598 void 1599 set_icf_status(Icf_status value) 1600 { this->icf_status_ = value; } 1601 1602 void 1603 set_execstack_status(Execstack value) 1604 { this->execstack_status_ = value; } 1605 1606 void 1607 set_do_demangle(bool value) 1608 { this->do_demangle_ = value; } 1609 1610 void 1611 set_static(bool value) 1612 { static_ = value; } 1613 1614 // These are called by finalize() to set up the search-path correctly. 1615 void 1616 add_to_library_path_with_sysroot(const std::string& arg) 1617 { this->add_search_directory_to_library_path(Search_directory(arg, true)); } 1618 1619 // Apply any sysroot to the directory lists. 1620 void 1621 add_sysroot(); 1622 1623 // Add a plugin and its arguments to the list of plugins. 1624 void 1625 add_plugin(const char* filename); 1626 1627 // Add a plugin option. 1628 void 1629 add_plugin_option(const char* opt); 1630 1631 // Whether we printed version information. 1632 bool printed_version_; 1633 // Whether to mark the stack as executable. 1634 Execstack execstack_status_; 1635 // Whether to do code folding. 1636 Icf_status icf_status_; 1637 // Whether to do a static link. 1638 bool static_; 1639 // Whether to do demangling. 1640 bool do_demangle_; 1641 // List of plugin libraries. 1642 Plugin_manager* plugins_; 1643 // The parsed output of --dynamic-list files. For convenience in 1644 // script.cc, we store this as a Script_options object, even though 1645 // we only use a single Version_tree from it. 1646 Script_options dynamic_list_; 1647 // Whether a --dynamic-list file was provided. 1648 bool have_dynamic_list_; 1649 // The incremental linking mode. 1650 Incremental_mode incremental_mode_; 1651 // The disposition given by the --incremental-changed, 1652 // --incremental-unchanged or --incremental-unknown option. The 1653 // value may change as we proceed parsing the command line flags. 1654 Incremental_disposition incremental_disposition_; 1655 // The disposition to use for startup files (those marked 1656 // INCREMENTAL_STARTUP). 1657 Incremental_disposition incremental_startup_disposition_; 1658 // Whether we have seen one of the options that require incremental 1659 // build (--incremental-changed, --incremental-unchanged, 1660 // --incremental-unknown, or --incremental-startup-unchanged). 1661 bool implicit_incremental_; 1662 // Libraries excluded from automatic export, via --exclude-libs. 1663 Unordered_set<std::string> excluded_libs_; 1664 // List of symbol-names to keep, via -retain-symbol-info. 1665 Unordered_set<std::string> symbols_to_retain_; 1666 // Map from section name to address from --section-start. 1667 std::map<std::string, uint64_t> section_starts_; 1668 // Whether to process armv4 bx instruction relocation. 1669 Fix_v4bx fix_v4bx_; 1670 // Endianness. 1671 Endianness endianness_; 1672 // What local symbols to discard. 1673 Discard_locals discard_locals_; 1674 }; 1675 1676 // The position-dependent options. We use this to store the state of 1677 // the commandline at a particular point in parsing for later 1678 // reference. For instance, if we see "ld --whole-archive foo.a 1679 // --no-whole-archive," we want to store the whole-archive option with 1680 // foo.a, so when the time comes to parse foo.a we know we should do 1681 // it in whole-archive mode. We could store all of General_options, 1682 // but that's big, so we just pick the subset of flags that actually 1683 // change in a position-dependent way. 1684 1685 #define DEFINE_posdep(varname__, type__) \ 1686 public: \ 1687 type__ \ 1688 varname__() const \ 1689 { return this->varname__##_; } \ 1690 \ 1691 void \ 1692 set_##varname__(type__ value) \ 1693 { this->varname__##_ = value; } \ 1694 private: \ 1695 type__ varname__##_ 1696 1697 class Position_dependent_options 1698 { 1699 public: 1700 Position_dependent_options(const General_options& options 1701 = Position_dependent_options::default_options_) 1702 { copy_from_options(options); } 1703 1704 void copy_from_options(const General_options& options) 1705 { 1706 this->set_as_needed(options.as_needed()); 1707 this->set_Bdynamic(options.Bdynamic()); 1708 this->set_format_enum(options.format_enum()); 1709 this->set_whole_archive(options.whole_archive()); 1710 this->set_incremental_disposition(options.incremental_disposition()); 1711 } 1712 1713 DEFINE_posdep(as_needed, bool); 1714 DEFINE_posdep(Bdynamic, bool); 1715 DEFINE_posdep(format_enum, General_options::Object_format); 1716 DEFINE_posdep(whole_archive, bool); 1717 DEFINE_posdep(incremental_disposition, Incremental_disposition); 1718 1719 private: 1720 // This is a General_options with everything set to its default 1721 // value. A Position_dependent_options created with no argument 1722 // will take its values from here. 1723 static General_options default_options_; 1724 }; 1725 1726 1727 // A single file or library argument from the command line. 1728 1729 class Input_file_argument 1730 { 1731 public: 1732 enum Input_file_type 1733 { 1734 // A regular file, name used as-is, not searched. 1735 INPUT_FILE_TYPE_FILE, 1736 // A library name. When used, "lib" will be prepended and ".so" or 1737 // ".a" appended to make a filename, and that filename will be searched 1738 // for using the -L paths. 1739 INPUT_FILE_TYPE_LIBRARY, 1740 // A regular file, name used as-is, but searched using the -L paths. 1741 INPUT_FILE_TYPE_SEARCHED_FILE 1742 }; 1743 1744 // name: file name or library name 1745 // type: the type of this input file. 1746 // extra_search_path: an extra directory to look for the file, prior 1747 // to checking the normal library search path. If this is "", 1748 // then no extra directory is added. 1749 // just_symbols: whether this file only defines symbols. 1750 // options: The position dependent options at this point in the 1751 // command line, such as --whole-archive. 1752 Input_file_argument() 1753 : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""), 1754 just_symbols_(false), options_(), arg_serial_(0) 1755 { } 1756 1757 Input_file_argument(const char* name, Input_file_type type, 1758 const char* extra_search_path, 1759 bool just_symbols, 1760 const Position_dependent_options& options) 1761 : name_(name), type_(type), extra_search_path_(extra_search_path), 1762 just_symbols_(just_symbols), options_(options), arg_serial_(0) 1763 { } 1764 1765 // You can also pass in a General_options instance instead of a 1766 // Position_dependent_options. In that case, we extract the 1767 // position-independent vars from the General_options and only store 1768 // those. 1769 Input_file_argument(const char* name, Input_file_type type, 1770 const char* extra_search_path, 1771 bool just_symbols, 1772 const General_options& options) 1773 : name_(name), type_(type), extra_search_path_(extra_search_path), 1774 just_symbols_(just_symbols), options_(options), arg_serial_(0) 1775 { } 1776 1777 const char* 1778 name() const 1779 { return this->name_.c_str(); } 1780 1781 const Position_dependent_options& 1782 options() const 1783 { return this->options_; } 1784 1785 bool 1786 is_lib() const 1787 { return type_ == INPUT_FILE_TYPE_LIBRARY; } 1788 1789 bool 1790 is_searched_file() const 1791 { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; } 1792 1793 const char* 1794 extra_search_path() const 1795 { 1796 return (this->extra_search_path_.empty() 1797 ? NULL 1798 : this->extra_search_path_.c_str()); 1799 } 1800 1801 // Return whether we should only read symbols from this file. 1802 bool 1803 just_symbols() const 1804 { return this->just_symbols_; } 1805 1806 // Return whether this file may require a search using the -L 1807 // options. 1808 bool 1809 may_need_search() const 1810 { 1811 return (this->is_lib() 1812 || this->is_searched_file() 1813 || !this->extra_search_path_.empty()); 1814 } 1815 1816 // Set the serial number for this argument. 1817 void 1818 set_arg_serial(unsigned int arg_serial) 1819 { this->arg_serial_ = arg_serial; } 1820 1821 // Get the serial number. 1822 unsigned int 1823 arg_serial() const 1824 { return this->arg_serial_; } 1825 1826 private: 1827 // We use std::string, not const char*, here for convenience when 1828 // using script files, so that we do not have to preserve the string 1829 // in that case. 1830 std::string name_; 1831 Input_file_type type_; 1832 std::string extra_search_path_; 1833 bool just_symbols_; 1834 Position_dependent_options options_; 1835 // A unique index for this file argument in the argument list. 1836 unsigned int arg_serial_; 1837 }; 1838 1839 // A file or library, or a group, from the command line. 1840 1841 class Input_argument 1842 { 1843 public: 1844 // Create a file or library argument. 1845 explicit Input_argument(Input_file_argument file) 1846 : is_file_(true), file_(file), group_(NULL), lib_(NULL), script_info_(NULL) 1847 { } 1848 1849 // Create a group argument. 1850 explicit Input_argument(Input_file_group* group) 1851 : is_file_(false), group_(group), lib_(NULL), script_info_(NULL) 1852 { } 1853 1854 // Create a lib argument. 1855 explicit Input_argument(Input_file_lib* lib) 1856 : is_file_(false), group_(NULL), lib_(lib), script_info_(NULL) 1857 { } 1858 1859 // Return whether this is a file. 1860 bool 1861 is_file() const 1862 { return this->is_file_; } 1863 1864 // Return whether this is a group. 1865 bool 1866 is_group() const 1867 { return !this->is_file_ && this->lib_ == NULL; } 1868 1869 // Return whether this is a lib. 1870 bool 1871 is_lib() const 1872 { return this->lib_ != NULL; } 1873 1874 // Return the information about the file. 1875 const Input_file_argument& 1876 file() const 1877 { 1878 gold_assert(this->is_file_); 1879 return this->file_; 1880 } 1881 1882 // Return the information about the group. 1883 const Input_file_group* 1884 group() const 1885 { 1886 gold_assert(!this->is_file_); 1887 return this->group_; 1888 } 1889 1890 Input_file_group* 1891 group() 1892 { 1893 gold_assert(!this->is_file_); 1894 return this->group_; 1895 } 1896 1897 // Return the information about the lib. 1898 const Input_file_lib* 1899 lib() const 1900 { 1901 gold_assert(!this->is_file_); 1902 gold_assert(this->lib_); 1903 return this->lib_; 1904 } 1905 1906 Input_file_lib* 1907 lib() 1908 { 1909 gold_assert(!this->is_file_); 1910 gold_assert(this->lib_); 1911 return this->lib_; 1912 } 1913 1914 // If a script generated this argument, store a pointer to the script info. 1915 // Currently used only for recording incremental link information. 1916 void 1917 set_script_info(Script_info* info) 1918 { this->script_info_ = info; } 1919 1920 Script_info* 1921 script_info() const 1922 { return this->script_info_; } 1923 1924 private: 1925 bool is_file_; 1926 Input_file_argument file_; 1927 Input_file_group* group_; 1928 Input_file_lib* lib_; 1929 Script_info* script_info_; 1930 }; 1931 1932 typedef std::vector<Input_argument> Input_argument_list; 1933 1934 // A group from the command line. This is a set of arguments within 1935 // --start-group ... --end-group. 1936 1937 class Input_file_group 1938 { 1939 public: 1940 typedef Input_argument_list::const_iterator const_iterator; 1941 1942 Input_file_group() 1943 : files_() 1944 { } 1945 1946 // Add a file to the end of the group. 1947 Input_argument& 1948 add_file(const Input_file_argument& arg) 1949 { 1950 this->files_.push_back(Input_argument(arg)); 1951 return this->files_.back(); 1952 } 1953 1954 // Iterators to iterate over the group contents. 1955 1956 const_iterator 1957 begin() const 1958 { return this->files_.begin(); } 1959 1960 const_iterator 1961 end() const 1962 { return this->files_.end(); } 1963 1964 private: 1965 Input_argument_list files_; 1966 }; 1967 1968 // A lib from the command line. This is a set of arguments within 1969 // --start-lib ... --end-lib. 1970 1971 class Input_file_lib 1972 { 1973 public: 1974 typedef Input_argument_list::const_iterator const_iterator; 1975 1976 Input_file_lib(const Position_dependent_options& options) 1977 : files_(), options_(options) 1978 { } 1979 1980 // Add a file to the end of the lib. 1981 Input_argument& 1982 add_file(const Input_file_argument& arg) 1983 { 1984 this->files_.push_back(Input_argument(arg)); 1985 return this->files_.back(); 1986 } 1987 1988 const Position_dependent_options& 1989 options() const 1990 { return this->options_; } 1991 1992 // Iterators to iterate over the lib contents. 1993 1994 const_iterator 1995 begin() const 1996 { return this->files_.begin(); } 1997 1998 const_iterator 1999 end() const 2000 { return this->files_.end(); } 2001 2002 size_t 2003 size() const 2004 { return this->files_.size(); } 2005 2006 private: 2007 Input_argument_list files_; 2008 Position_dependent_options options_; 2009 }; 2010 2011 // A list of files from the command line or a script. 2012 2013 class Input_arguments 2014 { 2015 public: 2016 typedef Input_argument_list::const_iterator const_iterator; 2017 2018 Input_arguments() 2019 : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0) 2020 { } 2021 2022 // Add a file. 2023 Input_argument& 2024 add_file(Input_file_argument& arg); 2025 2026 // Start a group (the --start-group option). 2027 void 2028 start_group(); 2029 2030 // End a group (the --end-group option). 2031 void 2032 end_group(); 2033 2034 // Start a lib (the --start-lib option). 2035 void 2036 start_lib(const Position_dependent_options&); 2037 2038 // End a lib (the --end-lib option). 2039 void 2040 end_lib(); 2041 2042 // Return whether we are currently in a group. 2043 bool 2044 in_group() const 2045 { return this->in_group_; } 2046 2047 // Return whether we are currently in a lib. 2048 bool 2049 in_lib() const 2050 { return this->in_lib_; } 2051 2052 // The number of entries in the list. 2053 int 2054 size() const 2055 { return this->input_argument_list_.size(); } 2056 2057 // Iterators to iterate over the list of input files. 2058 2059 const_iterator 2060 begin() const 2061 { return this->input_argument_list_.begin(); } 2062 2063 const_iterator 2064 end() const 2065 { return this->input_argument_list_.end(); } 2066 2067 // Return whether the list is empty. 2068 bool 2069 empty() const 2070 { return this->input_argument_list_.empty(); } 2071 2072 // Return the number of input files. This may be larger than 2073 // input_argument_list_.size(), because of files that are part 2074 // of groups or libs. 2075 int 2076 number_of_input_files() const 2077 { return this->file_count_; } 2078 2079 private: 2080 Input_argument_list input_argument_list_; 2081 bool in_group_; 2082 bool in_lib_; 2083 unsigned int file_count_; 2084 }; 2085 2086 2087 // All the information read from the command line. These are held in 2088 // three separate structs: one to hold the options (--foo), one to 2089 // hold the filenames listed on the commandline, and one to hold 2090 // linker script information. This third is not a subset of the other 2091 // two because linker scripts can be specified either as options (via 2092 // -T) or as a file. 2093 2094 class Command_line 2095 { 2096 public: 2097 typedef Input_arguments::const_iterator const_iterator; 2098 2099 Command_line(); 2100 2101 // Process the command line options. This will exit with an 2102 // appropriate error message if an unrecognized option is seen. 2103 void 2104 process(int argc, const char** argv); 2105 2106 // Process one command-line option. This takes the index of argv to 2107 // process, and returns the index for the next option. no_more_options 2108 // is set to true if argv[i] is "--". 2109 int 2110 process_one_option(int argc, const char** argv, int i, 2111 bool* no_more_options); 2112 2113 // Get the general options. 2114 const General_options& 2115 options() const 2116 { return this->options_; } 2117 2118 // Get the position dependent options. 2119 const Position_dependent_options& 2120 position_dependent_options() const 2121 { return this->position_options_; } 2122 2123 // Get the linker-script options. 2124 Script_options& 2125 script_options() 2126 { return this->script_options_; } 2127 2128 // Finalize the version-script options and return them. 2129 const Version_script_info& 2130 version_script(); 2131 2132 // Get the input files. 2133 Input_arguments& 2134 inputs() 2135 { return this->inputs_; } 2136 2137 // The number of input files. 2138 int 2139 number_of_input_files() const 2140 { return this->inputs_.number_of_input_files(); } 2141 2142 // Iterators to iterate over the list of input files. 2143 2144 const_iterator 2145 begin() const 2146 { return this->inputs_.begin(); } 2147 2148 const_iterator 2149 end() const 2150 { return this->inputs_.end(); } 2151 2152 private: 2153 Command_line(const Command_line&); 2154 Command_line& operator=(const Command_line&); 2155 2156 // This is a dummy class to provide a constructor that runs before 2157 // the constructor for the General_options. The Pre_options constructor 2158 // is used as a hook to set the flag enabling the options to register 2159 // themselves. 2160 struct Pre_options { 2161 Pre_options(); 2162 }; 2163 2164 // This must come before options_! 2165 Pre_options pre_options_; 2166 General_options options_; 2167 Position_dependent_options position_options_; 2168 Script_options script_options_; 2169 Input_arguments inputs_; 2170 }; 2171 2172 } // End namespace gold. 2173 2174 #endif // !defined(GOLD_OPTIONS_H) 2175