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 One_optionOne_option170 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 takes_argumentOne_option192 takes_argument() const 193 { return this->helparg != NULL; } 194 195 // Whether the argument is optional. 196 bool takes_optional_argumentOne_option197 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 ~Struct_varStruct_var224 ~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*); Struct_specialStruct_special234 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 parse_to_valueStruct_special241 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. Search_directory()567 Search_directory() 568 : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false) 569 { } 570 571 // This is the usual constructor. Search_directory(const std::string & name,bool put_in_sysroot)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& name()590 name() const 591 { return this->name_; } 592 593 // Return whether this directory is in the sysroot. 594 bool is_in_sysroot()595 is_in_sysroot() const 596 { return this->is_in_sysroot_; } 597 598 // Return whether this is considered a system directory. 599 bool is_system_directory()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', false, 648 N_("Apply link-time values for dynamic relocations"), 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(experimental_use_relr, options::TWO_DASHES, '\0', false, 774 N_("Generate RELR dynamic relocations"), 775 N_("Do not generate RELR dynamic relocations")); 776 777 DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false, 778 N_("Export all dynamic symbols"), 779 N_("Do not export all dynamic symbols (default)")); 780 781 DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0', 782 N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL")); 783 784 DEFINE_special(EB, options::ONE_DASH, '\0', 785 N_("Link big-endian objects."), NULL); 786 787 DEFINE_special(EL, options::ONE_DASH, '\0', 788 N_("Link little-endian objects."), NULL); 789 790 DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false, 791 N_("Create exception frame header"), NULL); 792 793 DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL, 794 N_("(ARM only) Do not warn about objects with incompatible " 795 "enum sizes")); 796 797 DEFINE_set(auxiliary, options::TWO_DASHES, 'f', 798 N_("Auxiliary filter for shared object symbol table"), 799 N_("SHLIB")); 800 801 DEFINE_string(filter, options::TWO_DASHES, 'F', NULL, 802 N_("Filter for shared object symbol table"), 803 N_("SHLIB")); 804 805 DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false, 806 N_("Treat warnings as errors"), 807 N_("Do not treat warnings as errors")); 808 809 DEFINE_string(fini, options::ONE_DASH, '\0', "_fini", 810 N_("Call SYMBOL at unload-time"), N_("SYMBOL")); 811 812 DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false, 813 N_("(ARM only) Fix binaries for Cortex-A8 erratum."), 814 N_("(ARM only) Do not fix binaries for Cortex-A8 erratum.")); 815 816 DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false, 817 N_("(AArch64 only) Fix Cortex-A53 erratum 843419."), 818 N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419.")); 819 820 DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false, 821 N_("(AArch64 only) Fix Cortex-A53 erratum 835769."), 822 N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769.")); 823 824 DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true, 825 N_("(ARM only) Fix binaries for ARM1176 erratum."), 826 N_("(ARM only) Do not fix binaries for ARM1176 erratum.")); 827 828 DEFINE_bool(merge_exidx_entries, options::TWO_DASHES, '\0', true, 829 N_("(ARM only) Merge exidx entries in debuginfo."), 830 N_("(ARM only) Do not merge exidx entries in debuginfo.")); 831 832 DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0', 833 N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"), 834 NULL); 835 836 DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0', 837 N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking " 838 "veneer"), 839 NULL); 840 841 DEFINE_bool(long_plt, options::TWO_DASHES, '\0', false, 842 N_("(ARM only) Generate long PLT entries"), 843 N_("(ARM only) Do not generate long PLT entries")); 844 845 DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false, 846 N_("Ignored"), NULL); 847 848 DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false, 849 N_("Generate .gdb_index section"), 850 N_("Do not generate .gdb_index section")); 851 852 DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true, 853 N_("Enable STB_GNU_UNIQUE symbol binding (default)"), 854 N_("Disable STB_GNU_UNIQUE symbol binding")); 855 856 DEFINE_string(soname, options::ONE_DASH, 'h', NULL, 857 N_("Set shared library name"), N_("FILENAME")); 858 859 DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0, 860 N_("Min fraction of empty buckets in dynamic hash"), 861 N_("FRACTION")); 862 863 DEFINE_enum(hash_style, options::TWO_DASHES, '\0', "sysv", 864 N_("Dynamic hash style"), N_("[sysv,gnu,both]"), 865 {"sysv", "gnu", "both"}); 866 867 DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL, 868 N_("Set dynamic linker path"), N_("PROGRAM")); 869 870 DEFINE_special(incremental, options::TWO_DASHES, '\0', 871 N_("Do an incremental link if possible; " 872 "otherwise, do a full link and prepare output " 873 "for incremental linking"), NULL); 874 875 DEFINE_special(no_incremental, options::TWO_DASHES, '\0', 876 N_("Do a full link (default)"), NULL); 877 878 DEFINE_special(incremental_full, options::TWO_DASHES, '\0', 879 N_("Do a full link and " 880 "prepare output for incremental linking"), NULL); 881 882 DEFINE_special(incremental_update, options::TWO_DASHES, '\0', 883 N_("Do an incremental link; exit if not possible"), NULL); 884 885 DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL, 886 N_("Set base file for incremental linking" 887 " (default is output file)"), 888 N_("FILE")); 889 890 DEFINE_special(incremental_changed, options::TWO_DASHES, '\0', 891 N_("Assume files changed"), NULL); 892 893 DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0', 894 N_("Assume files didn't change"), NULL); 895 896 DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0', 897 N_("Use timestamps to check files (default)"), NULL); 898 899 DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0', 900 N_("Assume startup files unchanged " 901 "(files preceding this option)"), NULL); 902 903 DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10, 904 N_("Amount of extra space to allocate for patches"), 905 N_("PERCENT")); 906 907 DEFINE_string(init, options::ONE_DASH, '\0', "_init", 908 N_("Call SYMBOL at load-time"), N_("SYMBOL")); 909 910 DEFINE_special(just_symbols, options::TWO_DASHES, '\0', 911 N_("Read only symbol values from FILE"), N_("FILE")); 912 913 DEFINE_bool(map_whole_files, options::TWO_DASHES, '\0', 914 sizeof(void*) >= 8, 915 N_("Map whole files to memory (default on 64-bit hosts)"), 916 N_("Map relevant file parts to memory (default on 32-bit " 917 "hosts)")); 918 DEFINE_bool(keep_files_mapped, options::TWO_DASHES, '\0', true, 919 N_("Keep files mapped across passes (default)"), 920 N_("Release mapped files after each pass")); 921 922 DEFINE_bool(ld_generated_unwind_info, options::TWO_DASHES, '\0', true, 923 N_("Generate unwind information for PLT (default)"), 924 N_("Do not generate unwind information for PLT")); 925 926 DEFINE_special(library, options::TWO_DASHES, 'l', 927 N_("Search for library LIBNAME"), N_("LIBNAME")); 928 929 DEFINE_dirlist(library_path, options::TWO_DASHES, 'L', 930 N_("Add directory to search path"), N_("DIR")); 931 932 DEFINE_bool(text_reorder, options::TWO_DASHES, '\0', true, 933 N_("Enable text section reordering for GCC section names " 934 "(default)"), 935 N_("Disable text section reordering for GCC section names")); 936 937 DEFINE_bool(nostdlib, options::ONE_DASH, '\0', false, 938 N_("Only search directories specified on the command line."), 939 NULL); 940 941 DEFINE_bool(rosegment, options::TWO_DASHES, '\0', false, 942 N_("Put read-only non-executable sections in their own segment"), 943 NULL); 944 945 DEFINE_uint64(rosegment_gap, options::TWO_DASHES, '\0', -1U, 946 N_("Set offset between executable and read-only segments"), 947 N_("OFFSET")); 948 949 DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "", 950 N_("Set GNU linker emulation; obsolete"), N_("EMULATION")); 951 952 DEFINE_bool(mmap_output_file, options::TWO_DASHES, '\0', true, 953 N_("Map the output file for writing (default)."), 954 N_("Do not map the output file for writing.")); 955 956 DEFINE_bool(print_map, options::TWO_DASHES, 'M', false, 957 N_("Write map file on standard output"), NULL); 958 DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"), 959 N_("MAPFILENAME")); 960 961 DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false, 962 N_("Do not page align data"), NULL); 963 DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false, 964 N_("Do not page align data, do not make text readonly"), 965 N_("Page align data, make text readonly")); 966 967 DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true, 968 N_("Enable use of DT_RUNPATH and DT_FLAGS"), 969 N_("Disable use of DT_RUNPATH and DT_FLAGS")); 970 971 DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false, 972 N_("Create an output file even if errors occur"), NULL); 973 974 DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0', 975 N_("Report undefined symbols (even with --shared)"), 976 NULL, false); 977 978 DEFINE_string(output, options::TWO_DASHES, 'o', "a.out", 979 N_("Set output file name"), N_("FILE")); 980 981 DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0, 982 N_("Optimize output file size"), N_("LEVEL")); 983 984 DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf", 985 N_("Set output format"), N_("[binary]")); 986 987 DEFINE_bool(p, options::ONE_DASH, '\0', false, 988 N_("(ARM only) Ignore for backward compatibility"), NULL); 989 990 DEFINE_bool(pie, options::ONE_DASH, '\0', false, 991 N_("Create a position independent executable"), 992 N_("Do not create a position independent executable")); 993 DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0', 994 N_("Create a position independent executable"), 995 N_("Do not create a position independent executable"), 996 false); 997 998 DEFINE_bool(pic_veneer, options::TWO_DASHES, '\0', false, 999 N_("Force PIC sequences for ARM/Thumb interworking veneers"), 1000 NULL); 1001 1002 DEFINE_bool(disable_pie_when_unsafe_data_size, 1003 options::TWO_DASHES, '\0', true, 1004 N_("Disable creation of position independent executable" 1005 " when data segment size is larger than the safe value"), 1006 N_("Do not disable creation of position independent executable" 1007 " when data segment size is larger than the safe value")); 1008 1009 DEFINE_bool(pipeline_knowledge, options::ONE_DASH, '\0', false, 1010 NULL, N_("(ARM only) Ignore for backward compatibility")); 1011 1012 DEFINE_var(plt_align, options::TWO_DASHES, '\0', 0, "5", 1013 N_("(PowerPC64 only) Align PLT call stubs to fit cache lines"), 1014 N_("[=P2ALIGN]"), true, int, int, options::parse_uint); 1015 1016 DEFINE_bool(plt_static_chain, options::TWO_DASHES, '\0', false, 1017 N_("(PowerPC64 only) PLT call stubs should load r11"), 1018 N_("(PowerPC64 only) PLT call stubs should not load r11")); 1019 1020 DEFINE_bool(plt_thread_safe, options::TWO_DASHES, '\0', false, 1021 N_("(PowerPC64 only) PLT call stubs with load-load barrier"), 1022 N_("(PowerPC64 only) PLT call stubs without barrier")); 1023 1024 #ifdef ENABLE_PLUGINS 1025 DEFINE_special(plugin, options::TWO_DASHES, '\0', 1026 N_("Load a plugin library"), N_("PLUGIN")); 1027 DEFINE_special(plugin_opt, options::TWO_DASHES, '\0', 1028 N_("Pass an option to the plugin"), N_("OPTION")); 1029 #endif 1030 1031 DEFINE_bool(posix_fallocate, options::TWO_DASHES, '\0', true, 1032 N_("Use posix_fallocate to reserve space in the output file" 1033 " (default)."), 1034 N_("Use fallocate or ftruncate to reserve space.")); 1035 1036 DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false, 1037 N_("Preread archive symbols when multi-threaded"), NULL); 1038 1039 DEFINE_bool(print_output_format, options::TWO_DASHES, '\0', false, 1040 N_("Print default output format"), NULL); 1041 1042 DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL, 1043 N_("Print symbols defined and used for each input"), 1044 N_("FILENAME")); 1045 1046 DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false, 1047 N_("Ignored for SVR4 compatibility"), NULL); 1048 1049 DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false, 1050 N_("Generate relocations in output"), NULL); 1051 1052 DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false, 1053 N_("Generate relocatable output"), NULL); 1054 DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0', 1055 N_("Synonym for -r"), NULL, false); 1056 1057 DEFINE_bool(relax, options::TWO_DASHES, '\0', false, 1058 N_("Relax branches on certain targets"), NULL); 1059 1060 DEFINE_string(retain_symbols_file, options::TWO_DASHES, '\0', NULL, 1061 N_("keep only symbols listed in this file"), N_("FILE")); 1062 1063 // -R really means -rpath, but can mean --just-symbols for 1064 // compatibility with GNU ld. -rpath is always -rpath, so we list 1065 // it separately. 1066 DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R', 1067 N_("Add DIR to runtime search path"), N_("DIR")); 1068 1069 DEFINE_dirlist(rpath, options::ONE_DASH, '\0', 1070 N_("Add DIR to runtime search path"), N_("DIR")); 1071 1072 DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0', 1073 N_("Add DIR to link time shared library search path"), 1074 N_("DIR")); 1075 1076 DEFINE_string(section_ordering_file, options::TWO_DASHES, '\0', NULL, 1077 N_("Layout sections in the order specified."), 1078 N_("FILENAME")); 1079 1080 DEFINE_special(section_start, options::TWO_DASHES, '\0', 1081 N_("Set address of section"), N_("SECTION=ADDRESS")); 1082 1083 DEFINE_bool(secure_plt, options::TWO_DASHES , '\0', true, 1084 N_("(PowerPC only) Use new-style PLT"), NULL); 1085 1086 DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL, 1087 N_("Sort common symbols by alignment"), 1088 N_("[={ascending,descending}]")); 1089 1090 DEFINE_enum(sort_section, options::TWO_DASHES, '\0', "none", 1091 N_("Sort sections by name. \'--no-text-reorder\'" 1092 " will override \'--sort-section=name\' for .text"), 1093 N_("[none,name]"), 1094 {"none", "name"}); 1095 1096 DEFINE_uint(spare_dynamic_tags, options::TWO_DASHES, '\0', 5, 1097 N_("Dynamic tag slots to reserve (default 5)"), 1098 N_("COUNT")); 1099 1100 DEFINE_bool(strip_all, options::TWO_DASHES, 's', false, 1101 N_("Strip all symbols"), NULL); 1102 DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false, 1103 N_("Strip debugging information"), NULL); 1104 DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false, 1105 N_("Emit only debug line number information"), NULL); 1106 DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false, 1107 N_("Strip debug symbols that are unused by gdb " 1108 "(at least versions <= 7.4)"), NULL); 1109 DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true, 1110 N_("Strip LTO intermediate code sections"), NULL); 1111 1112 DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1, 1113 N_("(ARM, PowerPC only) The maximum distance from instructions " 1114 "in a group of sections to their stubs. Negative values mean " 1115 "stubs are always after the group. 1 means use default size"), 1116 N_("SIZE")); 1117 1118 DEFINE_bool(stub_group_multi, options::TWO_DASHES, '\0', false, 1119 N_("(PowerPC only) Allow a group of stubs to serve multiple " 1120 "output sections"), NULL); 1121 1122 DEFINE_bool(stub_group_auto_padding, options::TWO_DASHES , '\0', true, 1123 N_("(ARM) For very large binaries, relaxation iterations " 1124 "take long. This option turns on 'smart padding' for stub " 1125 "table, which reduces up to 50% of relaxation time on large " 1126 "objects."), NULL); 1127 1128 DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false, 1129 N_("Use less memory and more disk I/O " 1130 "(included only for compatibility with GNU ld)"), NULL); 1131 1132 DEFINE_bool(shared, options::ONE_DASH, 'G', false, 1133 N_("Generate shared library"), NULL); 1134 1135 DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false, 1136 N_("Generate shared library"), NULL); 1137 1138 DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x4000, 1139 N_("Stack size when -fsplit-stack function calls non-split"), 1140 N_("SIZE")); 1141 1142 // This is not actually special in any way, but I need to give it 1143 // a non-standard accessor-function name because 'static' is a keyword. 1144 DEFINE_special(static, options::ONE_DASH, '\0', 1145 N_("Do not link against shared libraries"), NULL); 1146 1147 DEFINE_enum(icf, options::TWO_DASHES, '\0', "none", 1148 N_("Identical Code Folding. " 1149 "\'--icf=safe\' Folds ctors, dtors and functions whose" 1150 " pointers are definitely not taken."), 1151 ("[none,all,safe]"), 1152 {"none", "all", "safe"}); 1153 1154 DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0, 1155 N_("Number of iterations of ICF (default 2)"), N_("COUNT")); 1156 1157 DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false, 1158 N_("List folded identical sections on stderr"), 1159 N_("Do not list folded identical sections")); 1160 1161 DEFINE_set(keep_unique, options::TWO_DASHES, '\0', 1162 N_("Do not fold this symbol during ICF"), N_("SYMBOL")); 1163 1164 DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false, 1165 N_("Remove unused sections"), 1166 N_("Don't remove unused sections (default)")); 1167 1168 DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false, 1169 N_("List removed unused sections on stderr"), 1170 N_("Do not list removed unused sections")); 1171 1172 DEFINE_bool(stats, options::TWO_DASHES, '\0', false, 1173 N_("Print resource usage statistics"), NULL); 1174 1175 DEFINE_string(sysroot, options::TWO_DASHES, '\0', "", 1176 N_("Set target system root directory"), N_("DIR")); 1177 1178 DEFINE_bool(trace, options::TWO_DASHES, 't', false, 1179 N_("Print the name of each input file"), NULL); 1180 1181 DEFINE_special(script, options::TWO_DASHES, 'T', 1182 N_("Read linker script"), N_("FILE")); 1183 1184 DEFINE_bool(threads, options::TWO_DASHES, '\0', false, 1185 N_("Run the linker multi-threaded"), 1186 N_("Do not run the linker multi-threaded")); 1187 DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0, 1188 N_("Number of threads to use"), N_("COUNT")); 1189 DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0, 1190 N_("Number of threads to use in initial pass"), N_("COUNT")); 1191 DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0, 1192 N_("Number of threads to use in middle pass"), N_("COUNT")); 1193 DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0, 1194 N_("Number of threads to use in final pass"), N_("COUNT")); 1195 1196 DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U, 1197 N_("Set the address of the bss segment"), N_("ADDRESS")); 1198 DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U, 1199 N_("Set the address of the data segment"), N_("ADDRESS")); 1200 DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U, 1201 N_("Set the address of the text segment"), N_("ADDRESS")); 1202 DEFINE_uint64_alias(Ttext_segment, Ttext, options::ONE_DASH, '\0', 1203 N_("Set the address of the text segment"), 1204 N_("ADDRESS")); 1205 DEFINE_uint64(Trodata_segment, options::ONE_DASH, '\0', -1U, 1206 N_("Set the address of the rodata segment"), N_("ADDRESS")); 1207 1208 DEFINE_bool(toc_optimize, options::TWO_DASHES, '\0', true, 1209 N_("(PowerPC64 only) Optimize TOC code sequences"), 1210 N_("(PowerPC64 only) Don't optimize TOC code sequences")); 1211 1212 DEFINE_bool(toc_sort, options::TWO_DASHES, '\0', true, 1213 N_("(PowerPC64 only) Sort TOC and GOT sections"), 1214 N_("(PowerPC64 only) Don't sort TOC and GOT sections")); 1215 1216 DEFINE_set(undefined, options::TWO_DASHES, 'u', 1217 N_("Create undefined reference to SYMBOL"), N_("SYMBOL")); 1218 1219 DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL, 1220 N_("How to handle unresolved symbols"), 1221 ("ignore-all,report-all,ignore-in-object-files," 1222 "ignore-in-shared-libs"), 1223 {"ignore-all", "report-all", "ignore-in-object-files", 1224 "ignore-in-shared-libs"}); 1225 1226 DEFINE_bool(verbose, options::TWO_DASHES, '\0', false, 1227 N_("Synonym for --debug=files"), NULL); 1228 1229 DEFINE_special(version_script, options::TWO_DASHES, '\0', 1230 N_("Read version script"), N_("FILE")); 1231 1232 DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false, 1233 N_("Warn about duplicate common symbols"), 1234 N_("Do not warn about duplicate common symbols (default)")); 1235 1236 DEFINE_bool(warn_constructors, options::TWO_DASHES, '\0', false, 1237 N_("Ignored"), N_("Ignored")); 1238 1239 DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false, 1240 N_("Warn if the stack is executable"), 1241 N_("Do not warn if the stack is executable (default)")); 1242 1243 DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true, 1244 NULL, N_("Don't warn about mismatched input files")); 1245 1246 DEFINE_bool(warn_multiple_gp, options::TWO_DASHES, '\0', false, 1247 N_("Ignored"), NULL); 1248 1249 DEFINE_bool(warn_poison_system_directories, options::TWO_DASHES, '\0', false, 1250 N_("Warn for -L options using system directories"), 1251 N_("Do not warn for -L options using system directories")); 1252 DEFINE_bool(error_poison_system_directories, options::TWO_DASHES, '\0', false, 1253 N_("Give an error for -L options using system directories"), 1254 NULL); 1255 1256 DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true, 1257 N_("Warn when skipping an incompatible library"), 1258 N_("Don't warn when skipping an incompatible library")); 1259 1260 DEFINE_bool(warn_shared_textrel, options::TWO_DASHES, '\0', false, 1261 N_("Warn if text segment is not shareable"), 1262 N_("Do not warn if text segment is not shareable (default)")); 1263 1264 DEFINE_bool(warn_unresolved_symbols, options::TWO_DASHES, '\0', false, 1265 N_("Report unresolved symbols as warnings"), 1266 NULL); 1267 DEFINE_bool_alias(error_unresolved_symbols, warn_unresolved_symbols, 1268 options::TWO_DASHES, '\0', 1269 N_("Report unresolved symbols as errors"), 1270 NULL, true); 1271 DEFINE_bool(weak_unresolved_symbols, options::TWO_DASHES, '\0', false, 1272 N_("Convert unresolved symbols to weak references"), 1273 NULL); 1274 1275 DEFINE_bool(wchar_size_warning, options::TWO_DASHES, '\0', true, NULL, 1276 N_("(ARM only) Do not warn about objects with incompatible " 1277 "wchar_t sizes")); 1278 1279 DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false, 1280 N_("Include all archive contents"), 1281 N_("Include only needed archive contents")); 1282 1283 DEFINE_set(wrap, options::TWO_DASHES, '\0', 1284 N_("Use wrapper functions for SYMBOL"), N_("SYMBOL")); 1285 1286 DEFINE_set(trace_symbol, options::TWO_DASHES, 'y', 1287 N_("Trace references to symbol"), N_("SYMBOL")); 1288 1289 DEFINE_bool(undefined_version, options::TWO_DASHES, '\0', true, 1290 N_("Allow unused version in script (default)"), 1291 N_("Do not allow unused version in script")); 1292 1293 DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "", 1294 N_("Default search path for Solaris compatibility"), 1295 N_("PATH")); 1296 1297 DEFINE_special(start_group, options::TWO_DASHES, '(', 1298 N_("Start a library search group"), NULL); 1299 DEFINE_special(end_group, options::TWO_DASHES, ')', 1300 N_("End a library search group"), NULL); 1301 1302 1303 DEFINE_special(start_lib, options::TWO_DASHES, '\0', 1304 N_("Start a library"), NULL); 1305 DEFINE_special(end_lib, options::TWO_DASHES, '\0', 1306 N_("End a library "), NULL); 1307 1308 DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "", 1309 N_("Ignored for GCC linker option compatibility"), 1310 ""); 1311 1312 // The -z options. 1313 1314 DEFINE_bool(combreloc, options::DASH_Z, '\0', true, 1315 N_("Sort dynamic relocs"), 1316 N_("Do not sort dynamic relocs")); 1317 DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0, 1318 N_("Set common page size to SIZE"), N_("SIZE")); 1319 DEFINE_bool(defs, options::DASH_Z, '\0', false, 1320 N_("Report undefined symbols (even with --shared)"), 1321 NULL); 1322 DEFINE_bool(execstack, options::DASH_Z, '\0', false, 1323 N_("Mark output as requiring executable stack"), NULL); 1324 DEFINE_bool(global, options::DASH_Z, '\0', false, 1325 N_("Make symbols in DSO available for subsequently loaded " 1326 "objects"), NULL); 1327 DEFINE_bool(initfirst, options::DASH_Z, '\0', false, 1328 N_("Mark DSO to be initialized first at runtime"), 1329 NULL); 1330 DEFINE_bool(interpose, options::DASH_Z, '\0', false, 1331 N_("Mark object to interpose all DSOs but executable"), 1332 NULL); 1333 DEFINE_bool_alias(lazy, now, options::DASH_Z, '\0', 1334 N_("Mark object for lazy runtime binding (default)"), 1335 NULL, true); 1336 DEFINE_bool(loadfltr, options::DASH_Z, '\0', false, 1337 N_("Mark object requiring immediate process"), 1338 NULL); 1339 DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0, 1340 N_("Set maximum page size to SIZE"), N_("SIZE")); 1341 DEFINE_bool(muldefs, options::DASH_Z, '\0', false, 1342 N_("Allow multiple definitions of symbols"), 1343 NULL); 1344 // copyreloc is here in the list because there is only -z 1345 // nocopyreloc, not -z copyreloc. 1346 DEFINE_bool(copyreloc, options::DASH_Z, '\0', true, 1347 NULL, 1348 N_("Do not create copy relocs")); 1349 DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false, 1350 N_("Mark object not to use default search paths"), 1351 NULL); 1352 DEFINE_bool(nodelete, options::DASH_Z, '\0', false, 1353 N_("Mark DSO non-deletable at runtime"), 1354 NULL); 1355 DEFINE_bool(nodlopen, options::DASH_Z, '\0', false, 1356 N_("Mark DSO not available to dlopen"), 1357 NULL); 1358 DEFINE_bool(nodump, options::DASH_Z, '\0', false, 1359 N_("Mark DSO not available to dldump"), 1360 NULL); 1361 DEFINE_bool(noexecstack, options::DASH_Z, '\0', false, 1362 N_("Mark output as not requiring executable stack"), NULL); 1363 DEFINE_bool(now, options::DASH_Z, '\0', false, 1364 N_("Mark object for immediate function binding"), 1365 NULL); 1366 DEFINE_bool(origin, options::DASH_Z, '\0', false, 1367 N_("Mark DSO to indicate that needs immediate $ORIGIN " 1368 "processing at runtime"), NULL); 1369 DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO, 1370 N_("Where possible mark variables read-only after relocation"), 1371 N_("Don't mark variables read-only after relocation")); 1372 DEFINE_uint64(stack_size, options::DASH_Z, '\0', 0, 1373 N_("Set PT_GNU_STACK segment p_memsz to SIZE"), N_("SIZE")); 1374 DEFINE_bool(text, options::DASH_Z, '\0', false, 1375 N_("Do not permit relocations in read-only segments"), 1376 N_("Permit relocations in read-only segments (default)")); 1377 DEFINE_bool_alias(textoff, text, options::DASH_Z, '\0', 1378 N_("Permit relocations in read-only segments (default)"), 1379 NULL, true); 1380 1381 public: 1382 typedef options::Dir_list Dir_list; 1383 1384 General_options(); 1385 1386 // Does post-processing on flags, making sure they all have 1387 // non-conflicting values. Also converts some flags from their 1388 // "standard" types (string, etc), to another type (enum, DirList), 1389 // which can be accessed via a separate method. Dies if it notices 1390 // any problems. 1391 void finalize(); 1392 1393 // True if we printed the version information. 1394 bool printed_version()1395 printed_version() const 1396 { return this->printed_version_; } 1397 1398 // The macro defines output() (based on --output), but that's a 1399 // generic name. Provide this alternative name, which is clearer. 1400 const char* output_file_name()1401 output_file_name() const 1402 { return this->output(); } 1403 1404 // This method sets/unsets the value of option -pie. This is used to 1405 // disable -pie when the size of the data segment becomes larger than 1406 // a safe value. 1407 void set_pie_value(bool value)1408 set_pie_value(bool value) 1409 { this->set_pie(value); } 1410 1411 // This is not defined via a flag, but combines flags to say whether 1412 // the output is position-independent or not. 1413 bool output_is_position_independent()1414 output_is_position_independent() const 1415 { return this->shared() || this->pie(); } 1416 1417 // Return true if the output is something that can be exec()ed, such 1418 // as a static executable, or a position-dependent or 1419 // position-independent executable, but not a dynamic library or an 1420 // object file. 1421 bool output_is_executable()1422 output_is_executable() const 1423 { return !this->shared() && !this->relocatable(); } 1424 1425 // This would normally be static(), and defined automatically, but 1426 // since static is a keyword, we need to come up with our own name. 1427 bool is_static()1428 is_static() const 1429 { return static_; } 1430 1431 // In addition to getting the input and output formats as a string 1432 // (via format() and oformat()), we also give access as an enum. 1433 enum Object_format 1434 { 1435 // Ordinary ELF. 1436 OBJECT_FORMAT_ELF, 1437 // Straight binary format. 1438 OBJECT_FORMAT_BINARY 1439 }; 1440 1441 // Convert a string to an Object_format. Gives an error if the 1442 // string is not recognized. 1443 static Object_format 1444 string_to_object_format(const char* arg); 1445 1446 // Note: these functions are not very fast. 1447 Object_format format_enum() const; 1448 Object_format oformat_enum() const; 1449 1450 // Return whether FILENAME is in a system directory. 1451 bool 1452 is_in_system_directory(const std::string& name) const; 1453 1454 // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_. 1455 bool should_retain_symbol(const char * symbol_name)1456 should_retain_symbol(const char* symbol_name) const 1457 { 1458 if (symbols_to_retain_.empty()) // means flag wasn't specified 1459 return true; 1460 return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end(); 1461 } 1462 1463 // These are the best way to get access to the execstack state, 1464 // not execstack() and noexecstack() which are hard to use properly. 1465 bool is_execstack_set()1466 is_execstack_set() const 1467 { return this->execstack_status_ != EXECSTACK_FROM_INPUT; } 1468 1469 bool is_stack_executable()1470 is_stack_executable() const 1471 { return this->execstack_status_ == EXECSTACK_YES; } 1472 1473 bool icf_enabled()1474 icf_enabled() const 1475 { return this->icf_status_ != ICF_NONE; } 1476 1477 bool icf_safe_folding()1478 icf_safe_folding() const 1479 { return this->icf_status_ == ICF_SAFE; } 1480 1481 // The --demangle option takes an optional string, and there is also 1482 // a --no-demangle option. This is the best way to decide whether 1483 // to demangle or not. 1484 bool do_demangle()1485 do_demangle() const 1486 { return this->do_demangle_; } 1487 1488 // Returns TRUE if any plugin libraries have been loaded. 1489 bool has_plugins()1490 has_plugins() const 1491 { return this->plugins_ != NULL; } 1492 1493 // Return a pointer to the plugin manager. 1494 Plugin_manager* plugins()1495 plugins() const 1496 { return this->plugins_; } 1497 1498 // True iff SYMBOL was found in the file specified by dynamic-list. 1499 bool in_dynamic_list(const char * symbol)1500 in_dynamic_list(const char* symbol) const 1501 { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); } 1502 1503 // True if a --dynamic-list script was provided. 1504 bool have_dynamic_list()1505 have_dynamic_list() const 1506 { return this->have_dynamic_list_; } 1507 1508 // Finalize the dynamic list. 1509 void finalize_dynamic_list()1510 finalize_dynamic_list() 1511 { this->dynamic_list_.version_script_info()->finalize(); } 1512 1513 // The mode selected by the --incremental options. 1514 enum Incremental_mode 1515 { 1516 // No incremental linking (--no-incremental). 1517 INCREMENTAL_OFF, 1518 // Incremental update only (--incremental-update). 1519 INCREMENTAL_UPDATE, 1520 // Force a full link, but prepare for subsequent incremental link 1521 // (--incremental-full). 1522 INCREMENTAL_FULL, 1523 // Incremental update if possible, fallback to full link (--incremental). 1524 INCREMENTAL_AUTO 1525 }; 1526 1527 // The incremental linking mode. 1528 Incremental_mode incremental_mode()1529 incremental_mode() const 1530 { return this->incremental_mode_; } 1531 1532 // The disposition given by the --incremental-changed, 1533 // --incremental-unchanged or --incremental-unknown option. The 1534 // value may change as we proceed parsing the command line flags. 1535 Incremental_disposition incremental_disposition()1536 incremental_disposition() const 1537 { return this->incremental_disposition_; } 1538 1539 // The disposition to use for startup files (those that precede the 1540 // first --incremental-changed, etc. option). 1541 Incremental_disposition incremental_startup_disposition()1542 incremental_startup_disposition() const 1543 { return this->incremental_startup_disposition_; } 1544 1545 // Return true if S is the name of a library excluded from automatic 1546 // symbol export. 1547 bool 1548 check_excluded_libs(const std::string &s) const; 1549 1550 // If an explicit start address was given for section SECNAME with 1551 // the --section-start option, return true and set *PADDR to the 1552 // address. Otherwise return false. 1553 bool 1554 section_start(const char* secname, uint64_t* paddr) const; 1555 1556 // Return whether any --section-start option was used. 1557 bool any_section_start()1558 any_section_start() const 1559 { return !this->section_starts_.empty(); } 1560 1561 enum Fix_v4bx 1562 { 1563 // Leave original instruction. 1564 FIX_V4BX_NONE, 1565 // Replace instruction. 1566 FIX_V4BX_REPLACE, 1567 // Generate an interworking veneer. 1568 FIX_V4BX_INTERWORKING 1569 }; 1570 1571 Fix_v4bx fix_v4bx()1572 fix_v4bx() const 1573 { return (this->fix_v4bx_); } 1574 1575 enum Endianness 1576 { 1577 ENDIANNESS_NOT_SET, 1578 ENDIANNESS_BIG, 1579 ENDIANNESS_LITTLE 1580 }; 1581 1582 Endianness endianness()1583 endianness() const 1584 { return this->endianness_; } 1585 1586 bool discard_all()1587 discard_all() const 1588 { return this->discard_locals_ == DISCARD_ALL; } 1589 1590 bool discard_locals()1591 discard_locals() const 1592 { return this->discard_locals_ == DISCARD_LOCALS; } 1593 1594 bool discard_sec_merge()1595 discard_sec_merge() const 1596 { return this->discard_locals_ == DISCARD_SEC_MERGE; } 1597 1598 private: 1599 // Don't copy this structure. 1600 General_options(const General_options&); 1601 General_options& operator=(const General_options&); 1602 1603 // What local symbols to discard. 1604 enum Discard_locals 1605 { 1606 // Locals in merge sections (default). 1607 DISCARD_SEC_MERGE, 1608 // None (--discard-none). 1609 DISCARD_NONE, 1610 // Temporary locals (--discard-locals/-X). 1611 DISCARD_LOCALS, 1612 // All locals (--discard-all/-x). 1613 DISCARD_ALL 1614 }; 1615 1616 // Whether to mark the stack as executable. 1617 enum Execstack 1618 { 1619 // Not set on command line. 1620 EXECSTACK_FROM_INPUT, 1621 // Mark the stack as executable (-z execstack). 1622 EXECSTACK_YES, 1623 // Mark the stack as not executable (-z noexecstack). 1624 EXECSTACK_NO 1625 }; 1626 1627 enum Icf_status 1628 { 1629 // Do not fold any functions (Default or --icf=none). 1630 ICF_NONE, 1631 // All functions are candidates for folding. (--icf=all). 1632 ICF_ALL, 1633 // Only ctors and dtors are candidates for folding. (--icf=safe). 1634 ICF_SAFE 1635 }; 1636 1637 void set_icf_status(Icf_status value)1638 set_icf_status(Icf_status value) 1639 { this->icf_status_ = value; } 1640 1641 void set_execstack_status(Execstack value)1642 set_execstack_status(Execstack value) 1643 { this->execstack_status_ = value; } 1644 1645 void set_do_demangle(bool value)1646 set_do_demangle(bool value) 1647 { this->do_demangle_ = value; } 1648 1649 void set_static(bool value)1650 set_static(bool value) 1651 { static_ = value; } 1652 1653 // These are called by finalize() to set up the search-path correctly. 1654 void add_to_library_path_with_sysroot(const std::string & arg)1655 add_to_library_path_with_sysroot(const std::string& arg) 1656 { this->add_search_directory_to_library_path(Search_directory(arg, true)); } 1657 1658 // Apply any sysroot to the directory lists. 1659 void 1660 add_sysroot(); 1661 1662 // Add a plugin and its arguments to the list of plugins. 1663 void 1664 add_plugin(const char* filename); 1665 1666 // Add a plugin option. 1667 void 1668 add_plugin_option(const char* opt); 1669 1670 // Whether we printed version information. 1671 bool printed_version_; 1672 // Whether to mark the stack as executable. 1673 Execstack execstack_status_; 1674 // Whether to do code folding. 1675 Icf_status icf_status_; 1676 // Whether to do a static link. 1677 bool static_; 1678 // Whether to do demangling. 1679 bool do_demangle_; 1680 // List of plugin libraries. 1681 Plugin_manager* plugins_; 1682 // The parsed output of --dynamic-list files. For convenience in 1683 // script.cc, we store this as a Script_options object, even though 1684 // we only use a single Version_tree from it. 1685 Script_options dynamic_list_; 1686 // Whether a --dynamic-list file was provided. 1687 bool have_dynamic_list_; 1688 // The incremental linking mode. 1689 Incremental_mode incremental_mode_; 1690 // The disposition given by the --incremental-changed, 1691 // --incremental-unchanged or --incremental-unknown option. The 1692 // value may change as we proceed parsing the command line flags. 1693 Incremental_disposition incremental_disposition_; 1694 // The disposition to use for startup files (those marked 1695 // INCREMENTAL_STARTUP). 1696 Incremental_disposition incremental_startup_disposition_; 1697 // Whether we have seen one of the options that require incremental 1698 // build (--incremental-changed, --incremental-unchanged, 1699 // --incremental-unknown, or --incremental-startup-unchanged). 1700 bool implicit_incremental_; 1701 // Libraries excluded from automatic export, via --exclude-libs. 1702 Unordered_set<std::string> excluded_libs_; 1703 // List of symbol-names to keep, via -retain-symbol-info. 1704 Unordered_set<std::string> symbols_to_retain_; 1705 // Map from section name to address from --section-start. 1706 std::map<std::string, uint64_t> section_starts_; 1707 // Whether to process armv4 bx instruction relocation. 1708 Fix_v4bx fix_v4bx_; 1709 // Endianness. 1710 Endianness endianness_; 1711 // What local symbols to discard. 1712 Discard_locals discard_locals_; 1713 }; 1714 1715 // The position-dependent options. We use this to store the state of 1716 // the commandline at a particular point in parsing for later 1717 // reference. For instance, if we see "ld --whole-archive foo.a 1718 // --no-whole-archive," we want to store the whole-archive option with 1719 // foo.a, so when the time comes to parse foo.a we know we should do 1720 // it in whole-archive mode. We could store all of General_options, 1721 // but that's big, so we just pick the subset of flags that actually 1722 // change in a position-dependent way. 1723 1724 #define DEFINE_posdep(varname__, type__) \ 1725 public: \ 1726 type__ \ 1727 varname__() const \ 1728 { return this->varname__##_; } \ 1729 \ 1730 void \ 1731 set_##varname__(type__ value) \ 1732 { this->varname__##_ = value; } \ 1733 private: \ 1734 type__ varname__##_ 1735 1736 class Position_dependent_options 1737 { 1738 public: 1739 Position_dependent_options(const General_options& options 1740 = Position_dependent_options::default_options_) 1741 { copy_from_options(options); } 1742 copy_from_options(const General_options & options)1743 void copy_from_options(const General_options& options) 1744 { 1745 this->set_as_needed(options.as_needed()); 1746 this->set_Bdynamic(options.Bdynamic()); 1747 this->set_format_enum(options.format_enum()); 1748 this->set_whole_archive(options.whole_archive()); 1749 this->set_incremental_disposition(options.incremental_disposition()); 1750 } 1751 1752 DEFINE_posdep(as_needed, bool); 1753 DEFINE_posdep(Bdynamic, bool); 1754 DEFINE_posdep(format_enum, General_options::Object_format); 1755 DEFINE_posdep(whole_archive, bool); 1756 DEFINE_posdep(incremental_disposition, Incremental_disposition); 1757 1758 private: 1759 // This is a General_options with everything set to its default 1760 // value. A Position_dependent_options created with no argument 1761 // will take its values from here. 1762 static General_options default_options_; 1763 }; 1764 1765 1766 // A single file or library argument from the command line. 1767 1768 class Input_file_argument 1769 { 1770 public: 1771 enum Input_file_type 1772 { 1773 // A regular file, name used as-is, not searched. 1774 INPUT_FILE_TYPE_FILE, 1775 // A library name. When used, "lib" will be prepended and ".so" or 1776 // ".a" appended to make a filename, and that filename will be searched 1777 // for using the -L paths. 1778 INPUT_FILE_TYPE_LIBRARY, 1779 // A regular file, name used as-is, but searched using the -L paths. 1780 INPUT_FILE_TYPE_SEARCHED_FILE 1781 }; 1782 1783 // name: file name or library name 1784 // type: the type of this input file. 1785 // extra_search_path: an extra directory to look for the file, prior 1786 // to checking the normal library search path. If this is "", 1787 // then no extra directory is added. 1788 // just_symbols: whether this file only defines symbols. 1789 // options: The position dependent options at this point in the 1790 // command line, such as --whole-archive. Input_file_argument()1791 Input_file_argument() 1792 : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""), 1793 just_symbols_(false), options_(), arg_serial_(0) 1794 { } 1795 Input_file_argument(const char * name,Input_file_type type,const char * extra_search_path,bool just_symbols,const Position_dependent_options & options)1796 Input_file_argument(const char* name, Input_file_type type, 1797 const char* extra_search_path, 1798 bool just_symbols, 1799 const Position_dependent_options& options) 1800 : name_(name), type_(type), extra_search_path_(extra_search_path), 1801 just_symbols_(just_symbols), options_(options), arg_serial_(0) 1802 { } 1803 1804 // You can also pass in a General_options instance instead of a 1805 // Position_dependent_options. In that case, we extract the 1806 // position-independent vars from the General_options and only store 1807 // those. Input_file_argument(const char * name,Input_file_type type,const char * extra_search_path,bool just_symbols,const General_options & options)1808 Input_file_argument(const char* name, Input_file_type type, 1809 const char* extra_search_path, 1810 bool just_symbols, 1811 const General_options& options) 1812 : name_(name), type_(type), extra_search_path_(extra_search_path), 1813 just_symbols_(just_symbols), options_(options), arg_serial_(0) 1814 { } 1815 1816 const char* name()1817 name() const 1818 { return this->name_.c_str(); } 1819 1820 const Position_dependent_options& options()1821 options() const 1822 { return this->options_; } 1823 1824 bool is_lib()1825 is_lib() const 1826 { return type_ == INPUT_FILE_TYPE_LIBRARY; } 1827 1828 bool is_searched_file()1829 is_searched_file() const 1830 { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; } 1831 1832 const char* extra_search_path()1833 extra_search_path() const 1834 { 1835 return (this->extra_search_path_.empty() 1836 ? NULL 1837 : this->extra_search_path_.c_str()); 1838 } 1839 1840 // Return whether we should only read symbols from this file. 1841 bool just_symbols()1842 just_symbols() const 1843 { return this->just_symbols_; } 1844 1845 // Return whether this file may require a search using the -L 1846 // options. 1847 bool may_need_search()1848 may_need_search() const 1849 { 1850 return (this->is_lib() 1851 || this->is_searched_file() 1852 || !this->extra_search_path_.empty()); 1853 } 1854 1855 // Set the serial number for this argument. 1856 void set_arg_serial(unsigned int arg_serial)1857 set_arg_serial(unsigned int arg_serial) 1858 { this->arg_serial_ = arg_serial; } 1859 1860 // Get the serial number. 1861 unsigned int arg_serial()1862 arg_serial() const 1863 { return this->arg_serial_; } 1864 1865 private: 1866 // We use std::string, not const char*, here for convenience when 1867 // using script files, so that we do not have to preserve the string 1868 // in that case. 1869 std::string name_; 1870 Input_file_type type_; 1871 std::string extra_search_path_; 1872 bool just_symbols_; 1873 Position_dependent_options options_; 1874 // A unique index for this file argument in the argument list. 1875 unsigned int arg_serial_; 1876 }; 1877 1878 // A file or library, or a group, from the command line. 1879 1880 class Input_argument 1881 { 1882 public: 1883 // Create a file or library argument. Input_argument(Input_file_argument file)1884 explicit Input_argument(Input_file_argument file) 1885 : is_file_(true), file_(file), group_(NULL), lib_(NULL), script_info_(NULL) 1886 { } 1887 1888 // Create a group argument. Input_argument(Input_file_group * group)1889 explicit Input_argument(Input_file_group* group) 1890 : is_file_(false), group_(group), lib_(NULL), script_info_(NULL) 1891 { } 1892 1893 // Create a lib argument. Input_argument(Input_file_lib * lib)1894 explicit Input_argument(Input_file_lib* lib) 1895 : is_file_(false), group_(NULL), lib_(lib), script_info_(NULL) 1896 { } 1897 1898 // Return whether this is a file. 1899 bool is_file()1900 is_file() const 1901 { return this->is_file_; } 1902 1903 // Return whether this is a group. 1904 bool is_group()1905 is_group() const 1906 { return !this->is_file_ && this->lib_ == NULL; } 1907 1908 // Return whether this is a lib. 1909 bool is_lib()1910 is_lib() const 1911 { return this->lib_ != NULL; } 1912 1913 // Return the information about the file. 1914 const Input_file_argument& file()1915 file() const 1916 { 1917 gold_assert(this->is_file_); 1918 return this->file_; 1919 } 1920 1921 // Return the information about the group. 1922 const Input_file_group* group()1923 group() const 1924 { 1925 gold_assert(!this->is_file_); 1926 return this->group_; 1927 } 1928 1929 Input_file_group* group()1930 group() 1931 { 1932 gold_assert(!this->is_file_); 1933 return this->group_; 1934 } 1935 1936 // Return the information about the lib. 1937 const Input_file_lib* lib()1938 lib() const 1939 { 1940 gold_assert(!this->is_file_); 1941 gold_assert(this->lib_); 1942 return this->lib_; 1943 } 1944 1945 Input_file_lib* lib()1946 lib() 1947 { 1948 gold_assert(!this->is_file_); 1949 gold_assert(this->lib_); 1950 return this->lib_; 1951 } 1952 1953 // If a script generated this argument, store a pointer to the script info. 1954 // Currently used only for recording incremental link information. 1955 void set_script_info(Script_info * info)1956 set_script_info(Script_info* info) 1957 { this->script_info_ = info; } 1958 1959 Script_info* script_info()1960 script_info() const 1961 { return this->script_info_; } 1962 1963 private: 1964 bool is_file_; 1965 Input_file_argument file_; 1966 Input_file_group* group_; 1967 Input_file_lib* lib_; 1968 Script_info* script_info_; 1969 }; 1970 1971 typedef std::vector<Input_argument> Input_argument_list; 1972 1973 // A group from the command line. This is a set of arguments within 1974 // --start-group ... --end-group. 1975 1976 class Input_file_group 1977 { 1978 public: 1979 typedef Input_argument_list::const_iterator const_iterator; 1980 Input_file_group()1981 Input_file_group() 1982 : files_() 1983 { } 1984 1985 // Add a file to the end of the group. 1986 Input_argument& add_file(const Input_file_argument & arg)1987 add_file(const Input_file_argument& arg) 1988 { 1989 this->files_.push_back(Input_argument(arg)); 1990 return this->files_.back(); 1991 } 1992 1993 // Iterators to iterate over the group contents. 1994 1995 const_iterator begin()1996 begin() const 1997 { return this->files_.begin(); } 1998 1999 const_iterator end()2000 end() const 2001 { return this->files_.end(); } 2002 2003 private: 2004 Input_argument_list files_; 2005 }; 2006 2007 // A lib from the command line. This is a set of arguments within 2008 // --start-lib ... --end-lib. 2009 2010 class Input_file_lib 2011 { 2012 public: 2013 typedef Input_argument_list::const_iterator const_iterator; 2014 Input_file_lib(const Position_dependent_options & options)2015 Input_file_lib(const Position_dependent_options& options) 2016 : files_(), options_(options) 2017 { } 2018 2019 // Add a file to the end of the lib. 2020 Input_argument& add_file(const Input_file_argument & arg)2021 add_file(const Input_file_argument& arg) 2022 { 2023 this->files_.push_back(Input_argument(arg)); 2024 return this->files_.back(); 2025 } 2026 2027 const Position_dependent_options& options()2028 options() const 2029 { return this->options_; } 2030 2031 // Iterators to iterate over the lib contents. 2032 2033 const_iterator begin()2034 begin() const 2035 { return this->files_.begin(); } 2036 2037 const_iterator end()2038 end() const 2039 { return this->files_.end(); } 2040 2041 size_t size()2042 size() const 2043 { return this->files_.size(); } 2044 2045 private: 2046 Input_argument_list files_; 2047 Position_dependent_options options_; 2048 }; 2049 2050 // A list of files from the command line or a script. 2051 2052 class Input_arguments 2053 { 2054 public: 2055 typedef Input_argument_list::const_iterator const_iterator; 2056 Input_arguments()2057 Input_arguments() 2058 : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0) 2059 { } 2060 2061 // Add a file. 2062 Input_argument& 2063 add_file(Input_file_argument& arg); 2064 2065 // Start a group (the --start-group option). 2066 void 2067 start_group(); 2068 2069 // End a group (the --end-group option). 2070 void 2071 end_group(); 2072 2073 // Start a lib (the --start-lib option). 2074 void 2075 start_lib(const Position_dependent_options&); 2076 2077 // End a lib (the --end-lib option). 2078 void 2079 end_lib(); 2080 2081 // Return whether we are currently in a group. 2082 bool in_group()2083 in_group() const 2084 { return this->in_group_; } 2085 2086 // Return whether we are currently in a lib. 2087 bool in_lib()2088 in_lib() const 2089 { return this->in_lib_; } 2090 2091 // The number of entries in the list. 2092 int size()2093 size() const 2094 { return this->input_argument_list_.size(); } 2095 2096 // Iterators to iterate over the list of input files. 2097 2098 const_iterator begin()2099 begin() const 2100 { return this->input_argument_list_.begin(); } 2101 2102 const_iterator end()2103 end() const 2104 { return this->input_argument_list_.end(); } 2105 2106 // Return whether the list is empty. 2107 bool empty()2108 empty() const 2109 { return this->input_argument_list_.empty(); } 2110 2111 // Return the number of input files. This may be larger than 2112 // input_argument_list_.size(), because of files that are part 2113 // of groups or libs. 2114 int number_of_input_files()2115 number_of_input_files() const 2116 { return this->file_count_; } 2117 2118 private: 2119 Input_argument_list input_argument_list_; 2120 bool in_group_; 2121 bool in_lib_; 2122 unsigned int file_count_; 2123 }; 2124 2125 2126 // All the information read from the command line. These are held in 2127 // three separate structs: one to hold the options (--foo), one to 2128 // hold the filenames listed on the commandline, and one to hold 2129 // linker script information. This third is not a subset of the other 2130 // two because linker scripts can be specified either as options (via 2131 // -T) or as a file. 2132 2133 class Command_line 2134 { 2135 public: 2136 typedef Input_arguments::const_iterator const_iterator; 2137 2138 Command_line(); 2139 2140 // Process the command line options. This will exit with an 2141 // appropriate error message if an unrecognized option is seen. 2142 void 2143 process(int argc, const char** argv); 2144 2145 // Process one command-line option. This takes the index of argv to 2146 // process, and returns the index for the next option. no_more_options 2147 // is set to true if argv[i] is "--". 2148 int 2149 process_one_option(int argc, const char** argv, int i, 2150 bool* no_more_options); 2151 2152 // Get the general options. 2153 const General_options& options()2154 options() const 2155 { return this->options_; } 2156 2157 // Get the position dependent options. 2158 const Position_dependent_options& position_dependent_options()2159 position_dependent_options() const 2160 { return this->position_options_; } 2161 2162 // Get the linker-script options. 2163 Script_options& script_options()2164 script_options() 2165 { return this->script_options_; } 2166 2167 // Finalize the version-script options and return them. 2168 const Version_script_info& 2169 version_script(); 2170 2171 // Get the input files. 2172 Input_arguments& inputs()2173 inputs() 2174 { return this->inputs_; } 2175 2176 // The number of input files. 2177 int number_of_input_files()2178 number_of_input_files() const 2179 { return this->inputs_.number_of_input_files(); } 2180 2181 // Iterators to iterate over the list of input files. 2182 2183 const_iterator begin()2184 begin() const 2185 { return this->inputs_.begin(); } 2186 2187 const_iterator end()2188 end() const 2189 { return this->inputs_.end(); } 2190 2191 private: 2192 Command_line(const Command_line&); 2193 Command_line& operator=(const Command_line&); 2194 2195 // This is a dummy class to provide a constructor that runs before 2196 // the constructor for the General_options. The Pre_options constructor 2197 // is used as a hook to set the flag enabling the options to register 2198 // themselves. 2199 struct Pre_options { 2200 Pre_options(); 2201 }; 2202 2203 // This must come before options_! 2204 Pre_options pre_options_; 2205 General_options options_; 2206 Position_dependent_options position_options_; 2207 Script_options script_options_; 2208 Input_arguments inputs_; 2209 }; 2210 2211 } // End namespace gold. 2212 2213 #endif // !defined(GOLD_OPTIONS_H) 2214