gold/options.h

   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 // IS_DEFAULT is true for boolean options that are on by default,
 158 //    and thus should have "(default)" printed with the helpstring.
 159 // A One_option struct initializes itself with the global list of options
 160 // at constructor time, so be careful making one of these.
 161 struct One_option
 162 {
 163   std::string longname;
 164   Dashes dashes;
 165   char shortname;
 166   const char* default_value;
 167   const char* helpstring;
 168   const char* helparg;
 169   bool optional_arg;
 170   Struct_var* reader;
 171   bool is_default;
 172
 173   One_option(const char* ln, Dashes d, char sn, const char* dv,
 174              const char* hs, const char* ha, bool oa, Struct_var* r,
 175              bool id)
 176     : longname(ln), dashes(d), shortname(sn), default_value(dv ? dv : ""),
 177       helpstring(hs), helparg(ha), optional_arg(oa), reader(r),
 178       is_default(id)
 179   {
 180     // In longname, we convert all underscores to dashes, since GNU
 181     // style uses dashes in option names.  longname is likely to have
 182     // underscores in it because it's also used to declare a C++
 183     // function.
 184     const char* pos = strchr(this->longname.c_str(), '_');
 185     for (; pos; pos = strchr(pos, '_'))
 186       this->longname[pos - this->longname.c_str()] = '-';
 187
 188     // We only register ourselves if our helpstring is not NULL.  This
 189     // is to support the "no-VAR" boolean variables, which we
 190     // conditionally turn on by defining "no-VAR" help text.
 191     if (this->helpstring)
 192       this->register_option();
 193   }
 194
 195   // This option takes an argument iff helparg is not NULL.
 196   bool
 197   takes_argument() const
 198   { return this->helparg != NULL; }
 199
 200   // Whether the argument is optional.
 201   bool
 202   takes_optional_argument() const
 203   { return this->optional_arg; }
 204
 205   // Register this option with the global list of options.
 206   void
 207   register_option();
 208
 209   // Print this option to stdout (used with --help).
 210   void
 211   print() const;
 212 };
 213
 214 // All options have a Struct_##varname that inherits from this and
 215 // actually implements parse_to_value for that option.
 216 struct Struct_var
 217 {
 218   // OPTION: the name of the option as specified on the commandline,
 219   //    including leading dashes, and any text following the option:
 220   //    "-O", "--defsym=mysym=0x1000", etc.
 221   // ARG: the arg associated with this option, or NULL if the option
 222   //    takes no argument: "2", "mysym=0x1000", etc.
 223   // CMDLINE: the global Command_line object.  Used by DEFINE_special.
 224   // OPTIONS: the global General_options object.  Used by DEFINE_special.
 225   virtual void
 226   parse_to_value(const char* option, const char* arg,
 227                  Command_line* cmdline, General_options* options) = 0;
 228   virtual
 229   ~Struct_var()  // To make gcc happy.
 230   { }
 231 };
 232
 233 // This is for "special" options that aren't of any predefined type.
 234 struct Struct_special : public Struct_var
 235 {
 236   // If you change this, change the parse-fn in DEFINE_special as well.
 237   typedef void (General_options::*Parse_function)(const char*, const char*,
 238                                                   Command_line*);
 239   Struct_special(const char* varname, Dashes dashes, char shortname,
 240                  Parse_function parse_function,
 241                  const char* helpstring, const char* helparg)
 242     : option(varname, dashes, shortname, "", helpstring, helparg, false, this,
 243              false),
 244       parse(parse_function)
 245   { }
 246
 247   void parse_to_value(const char* option, const char* arg,
 248                       Command_line* cmdline, General_options* options)
 249   { (options->*(this->parse))(option, arg, cmdline); }
 250
 251   One_option option;
 252   Parse_function parse;
 253 };
 254
 255 }  // End namespace options.
 256
 257
 258 // These are helper macros use by DEFINE_uint64/etc below.
 259 // This macro is used inside the General_options_ class, so defines
 260 // var() and set_var() as General_options methods.  Arguments as are
 261 // for the constructor for One_option.  param_type__ is the same as
 262 // type__ for built-in types, and "const type__ &" otherwise.
 263 //
 264 // When we define the linker command option "assert", the macro argument
 265 // varname__ of DEFINE_var below will be replaced by "assert".  On Mac OSX
 266 // assert.h is included implicitly by one of the library headers we use.  To
 267 // avoid unintended macro substitution of "assert()", we need to enclose
 268 // varname__ with parenthese.
 269 #define DEFINE_var(varname__, dashes__, shortname__, default_value__,        \
 270                    default_value_as_string__, helpstring__, helparg__,       \
 271                    optional_arg__, type__, param_type__, parse_fn__,         \
 272                    is_default__)                                             \
 273  public:                                                                     \
 274   param_type__                                                               \
 275   (varname__)() const                                                        \
 276   { return this->varname__##_.value; }                                       \
 277                                                                              \
 278   bool                                                                       \
 279   user_set_##varname__() const                                               \
 280   { return this->varname__##_.user_set_via_option; }                         \
 281                                                                              \
 282   void                                                                       \
 283   set_user_set_##varname__()                                                 \
 284   { this->varname__##_.user_set_via_option = true; }                         \
 285                                                                              \
 286   static const bool varname__##is_default = is_default__;                    \
 287                                                                              \
 288  private:                                                                    \
 289   struct Struct_##varname__ : public options::Struct_var                     \
 290   {                                                                          \
 291     Struct_##varname__()                                                     \
 292       : option(#varname__, dashes__, shortname__, default_value_as_string__, \
 293                helpstring__, helparg__, optional_arg__, this, is_default__), \
 294         user_set_via_option(false), value(default_value__)                   \
 295     { }                                                                      \
 296                                                                              \
 297     void                                                                     \
 298     parse_to_value(const char* option_name, const char* arg,                 \
 299                    Command_line*, General_options*)                          \
 300     {                                                                        \
 301       parse_fn__(option_name, arg, &this->value);                            \
 302       this->user_set_via_option = true;                                      \
 303     }                                                                        \
 304                                                                              \
 305     options::One_option option;                                              \
 306     bool user_set_via_option;                                                \
 307     type__ value;                                                            \
 308   };                                                                         \
 309   Struct_##varname__ varname__##_;                                           \
 310   void                                                                       \
 311   set_##varname__(param_type__ value)                                        \
 312   { this->varname__##_.value = value; }
 313
 314 // These macros allow for easy addition of a new commandline option.
 315
 316 // If no_helpstring__ is not NULL, then in addition to creating
 317 // VARNAME, we also create an option called no-VARNAME (or, for a -z
 318 // option, noVARNAME).
 319 #define DEFINE_bool(varname__, dashes__, shortname__, default_value__,   \
 320                     helpstring__, no_helpstring__)                       \
 321   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 322              default_value__ ? "true" : "false", helpstring__, NULL,     \
 323              false, bool, bool, options::parse_bool, default_value__)    \
 324   struct Struct_no_##varname__ : public options::Struct_var              \
 325   {                                                                      \
 326     Struct_no_##varname__() : option((dashes__ == options::DASH_Z        \
 327                                       ? "no" #varname__                  \
 328                                       : "no-" #varname__),               \
 329                                      dashes__, '\0',                     \
 330                                      default_value__ ? "false" : "true", \
 331                                      no_helpstring__, NULL, false, this, \
 332                                      !(default_value__))                 \
 333     { }                                                                  \
 334                                                                          \
 335     void                                                                 \
 336     parse_to_value(const char*, const char*,                             \
 337                    Command_line*, General_options* options)              \
 338     {                                                                    \
 339       options->set_##varname__(false);                                   \
 340       options->set_user_set_##varname__();                               \
 341     }                                                                    \
 342                                                                          \
 343     options::One_option option;                                          \
 344   };                                                                     \
 345   Struct_no_##varname__ no_##varname__##_initializer_
 346
 347 #define DEFINE_bool_ignore(varname__, dashes__, shortname__,             \
 348                     helpstring__, no_helpstring__)                       \
 349   DEFINE_var(varname__, dashes__, shortname__, false,                    \
 350              "false", helpstring__, NULL,                                \
 351              false, bool, bool, options::parse_bool, false)              \
 352   struct Struct_no_##varname__ : public options::Struct_var              \
 353   {                                                                      \
 354     Struct_no_##varname__() : option((dashes__ == options::DASH_Z        \
 355                                       ? "no" #varname__                  \
 356                                       : "no-" #varname__),               \
 357                                      dashes__, '\0',                     \
 358                                      "false",                            \
 359                                      no_helpstring__, NULL, false, this, \
 360                                      false)                              \
 361     { }                                                                  \
 362                                                                          \
 363     void                                                                 \
 364     parse_to_value(const char*, const char*,                             \
 365                    Command_line*, General_options* options)              \
 366     {                                                                    \
 367       options->set_##varname__(false);                                   \
 368       options->set_user_set_##varname__();                               \
 369     }                                                                    \
 370                                                                          \
 371     options::One_option option;                                          \
 372   };                                                                     \
 373   Struct_no_##varname__ no_##varname__##_initializer_
 374
 375 #define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \
 376                       helpstring__, no_helpstring__)                     \
 377   DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \
 378              default_value__ ? "true" : "false", helpstring__, NULL,     \
 379              false, bool, bool, options::parse_bool, default_value__)    \
 380   struct Struct_disable_##varname__ : public options::Struct_var         \
 381   {                                                                      \
 382     Struct_disable_##varname__() : option("disable-" #varname__,         \
 383                                      dashes__, '\0',                     \
 384                                      default_value__ ? "false" : "true", \
 385                                      no_helpstring__, NULL, false, this, \
 386                                      !default_value__)                   \
 387     { }                                                                  \
 388                                                                          \
 389     void                                                                 \
 390     parse_to_value(const char*, const char*,                             \
 391                    Command_line*, General_options* options)              \
 392     { options->set_enable_##varname__(false); }                          \
 393                                                                          \
 394     options::One_option option;                                          \
 395   };                                                                     \
 396   Struct_disable_##varname__ disable_##varname__##_initializer_
 397
 398 #define DEFINE_int(varname__, dashes__, shortname__, default_value__,   \
 399                    helpstring__, helparg__)                             \
 400   DEFINE_var(varname__, dashes__, shortname__, default_value__,         \
 401              #default_value__, helpstring__, helparg__, false,          \
 402              int, int, options::parse_int, false)
 403
 404 #define DEFINE_uint(varname__, dashes__, shortname__, default_value__,  \
 405                    helpstring__, helparg__)                             \
 406   DEFINE_var(varname__, dashes__, shortname__, default_value__,         \
 407              #default_value__, helpstring__, helparg__, false,          \
 408              int, int, options::parse_uint, false)
 409
 410 #define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \
 411                       helpstring__, helparg__)                           \
 412   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 413              #default_value__, helpstring__, helparg__, false,           \
 414              uint64_t, uint64_t, options::parse_uint64, false)
 415
 416 #define DEFINE_double(varname__, dashes__, shortname__, default_value__, \
 417                       helpstring__, helparg__)                           \
 418   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 419              #default_value__, helpstring__, helparg__, false,           \
 420              double, double, options::parse_double, false)
 421
 422 #define DEFINE_percent(varname__, dashes__, shortname__, default_value__, \
 423                        helpstring__, helparg__)                           \
 424   DEFINE_var(varname__, dashes__, shortname__, default_value__ / 100.0,   \
 425              #default_value__, helpstring__, helparg__, false,            \
 426              double, double, options::parse_percent, false)
 427
 428 #define DEFINE_string(varname__, dashes__, shortname__, default_value__, \
 429                       helpstring__, helparg__)                           \
 430   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 431              default_value__, helpstring__, helparg__, false,            \
 432              const char*, const char*, options::parse_string, false)
 433
 434 // This is like DEFINE_string, but we convert each occurrence to a
 435 // Search_directory and store it in a vector.  Thus we also have the
 436 // add_to_VARNAME() method, to append to the vector.
 437 #define DEFINE_dirlist(varname__, dashes__, shortname__,                  \
 438                            helpstring__, helparg__)                       \
 439   DEFINE_var(varname__, dashes__, shortname__, ,                          \
 440              "", helpstring__, helparg__, false, options::Dir_list,       \
 441              const options::Dir_list&, options::parse_dirlist, false)     \
 442   void                                                                    \
 443   add_to_##varname__(const char* new_value)                               \
 444   { options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \
 445   void                                                                    \
 446   add_search_directory_to_##varname__(const Search_directory& dir)        \
 447   { this->varname__##_.value.push_back(dir); }
 448
 449 // This is like DEFINE_string, but we store a set of strings.
 450 #define DEFINE_set(varname__, dashes__, shortname__,                      \
 451                    helpstring__, helparg__)                               \
 452   DEFINE_var(varname__, dashes__, shortname__, ,                          \
 453              "", helpstring__, helparg__, false, options::String_set,     \
 454              const options::String_set&, options::parse_set, false)       \
 455  public:                                                                  \
 456   bool                                                                    \
 457   any_##varname__() const                                                 \
 458   { return !this->varname__##_.value.empty(); }                           \
 459                                                                           \
 460   bool                                                                    \
 461   is_##varname__(const char* symbol) const                                \
 462   {                                                                       \
 463     return (!this->varname__##_.value.empty()                             \
 464             && (this->varname__##_.value.find(std::string(symbol))        \
 465                 != this->varname__##_.value.end()));                      \
 466   }                                                                       \
 467                                                                           \
 468   options::String_set::const_iterator                                     \
 469   varname__##_begin() const                                               \
 470   { return this->varname__##_.value.begin(); }                            \
 471                                                                           \
 472   options::String_set::const_iterator                                     \
 473   varname__##_end() const                                                 \
 474   { return this->varname__##_.value.end(); }
 475
 476 // When you have a list of possible values (expressed as string)
 477 // After helparg__ should come an initializer list, like
 478 //   {"foo", "bar", "baz"}
 479 #define DEFINE_enum(varname__, dashes__, shortname__, default_value__,   \
 480                     helpstring__, helparg__, ...)                        \
 481   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 482              default_value__, helpstring__, helparg__, false,            \
 483              const char*, const char*, parse_choices_##varname__, false) \
 484  private:                                                                \
 485   static void parse_choices_##varname__(const char* option_name,         \
 486                                         const char* arg,                 \
 487                                         const char** retval) {           \
 488     const char* choices[] = __VA_ARGS__;                                 \
 489     options::parse_choices(option_name, arg, retval,                     \
 490                            choices, sizeof(choices) / sizeof(*choices)); \
 491   }
 492
 493 // This is like DEFINE_bool, but VARNAME is the name of a different
 494 // option.  This option becomes an alias for that one.  INVERT is true
 495 // if this option is an inversion of the other one.
 496 #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__,   \
 497                           helpstring__, no_helpstring__, invert__)      \
 498  private:                                                               \
 499   struct Struct_##option__ : public options::Struct_var                 \
 500   {                                                                     \
 501     Struct_##option__()                                                 \
 502       : option(#option__, dashes__, shortname__, "", helpstring__,      \
 503                NULL, false, this,                                       \
 504                General_options::varname__##is_default ^ invert__)       \
 505     { }                                                                 \
 506                                                                         \
 507     void                                                                \
 508     parse_to_value(const char*, const char*,                            \
 509                    Command_line*, General_options* options)             \
 510     {                                                                   \
 511       options->set_##varname__(!invert__);                              \
 512       options->set_user_set_##varname__();                              \
 513     }                                                                   \
 514                                                                         \
 515     options::One_option option;                                         \
 516   };                                                                    \
 517   Struct_##option__ option__##_;                                        \
 518                                                                         \
 519   struct Struct_no_##option__ : public options::Struct_var              \
 520   {                                                                     \
 521     Struct_no_##option__()                                              \
 522       : option((dashes__ == options::DASH_Z                             \
 523                 ? "no" #option__                                        \
 524                 : "no-" #option__),                                     \
 525                dashes__, '\0', "", no_helpstring__,                     \
 526                NULL, false, this,                                       \
 527                !General_options::varname__##is_default ^ invert__)      \
 528     { }                                                                 \
 529                                                                         \
 530     void                                                                \
 531     parse_to_value(const char*, const char*,                            \
 532                    Command_line*, General_options* options)             \
 533     {                                                                   \
 534       options->set_##varname__(invert__);                               \
 535       options->set_user_set_##varname__();                              \
 536     }                                                                   \
 537                                                                         \
 538     options::One_option option;                                         \
 539   };                                                                    \
 540   Struct_no_##option__ no_##option__##_initializer_
 541
 542 // This is like DEFINE_uint64, but VARNAME is the name of a different
 543 // option.  This option becomes an alias for that one.
 544 #define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \
 545                             helpstring__, helparg__)                    \
 546  private:                                                               \
 547   struct Struct_##option__ : public options::Struct_var                 \
 548   {                                                                     \
 549     Struct_##option__()                                                 \
 550       : option(#option__, dashes__, shortname__, "", helpstring__,      \
 551                helparg__, false, this, false)                           \
 552     { }                                                                 \
 553                                                                         \
 554     void                                                                \
 555     parse_to_value(const char* option_name, const char* arg,            \
 556                    Command_line*, General_options* options)             \
 557     {                                                                   \
 558       uint64_t value;                                                   \
 559       options::parse_uint64(option_name, arg, &value);                  \
 560       options->set_##varname__(value);                                  \
 561       options->set_user_set_##varname__();                              \
 562     }                                                                   \
 563                                                                         \
 564     options::One_option option;                                         \
 565   };                                                                    \
 566   Struct_##option__ option__##_;
 567
 568 // This is used for non-standard flags.  It defines no functions; it
 569 // just calls General_options::parse_VARNAME whenever the flag is
 570 // seen.  We declare parse_VARNAME as a static member of
 571 // General_options; you are responsible for defining it there.
 572 // helparg__ should be NULL iff this special-option is a boolean.
 573 #define DEFINE_special(varname__, dashes__, shortname__,                \
 574                        helpstring__, helparg__)                         \
 575  private:                                                               \
 576   void parse_##varname__(const char* option, const char* arg,           \
 577                          Command_line* inputs);                         \
 578   struct Struct_##varname__ : public options::Struct_special            \
 579   {                                                                     \
 580     Struct_##varname__()                                                \
 581       : options::Struct_special(#varname__, dashes__, shortname__,      \
 582                                 &General_options::parse_##varname__,    \
 583                                 helpstring__, helparg__)                \
 584     { }                                                                 \
 585   };                                                                    \
 586   Struct_##varname__ varname__##_initializer_
 587
 588 // An option that takes an optional string argument.  If the option is
 589 // used with no argument, the value will be the default, and
 590 // user_set_via_option will be true.
 591 #define DEFINE_optional_string(varname__, dashes__, shortname__,        \
 592                                default_value__,                         \
 593                                helpstring__, helparg__)                 \
 594   DEFINE_var(varname__, dashes__, shortname__, default_value__,         \
 595              default_value__, helpstring__, helparg__, true,            \
 596              const char*, const char*, options::parse_optional_string,  \
 597              false)
 598
 599 // A directory to search.  For each directory we record whether it is
 600 // in the sysroot.  We need to know this so that, if a linker script
 601 // is found within the sysroot, we will apply the sysroot to any files
 602 // named by that script.
 603
 604 class Search_directory
 605 {
 606  public:
 607   // We need a default constructor because we put this in a
 608   // std::vector.
 609   Search_directory()
 610     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
 611   { }
 612
 613   // This is the usual constructor.
 614   Search_directory(const std::string& name, bool put_in_sysroot)
 615     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
 616   {
 617     if (this->name_.empty())
 618       this->name_ = ".";
 619   }
 620
 621   // This is called if we have a sysroot.  The sysroot is prefixed to
 622   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
 623   // set to true for any enries which are in the sysroot (this will
 624   // naturally include any entries for which put_in_sysroot_ is true).
 625   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
 626   // passing SYSROOT to lrealpath.
 627   void
 628   add_sysroot(const char* sysroot, const char* canonical_sysroot);
 629
 630   // Get the directory name.
 631   const std::string&
 632   name() const
 633   { return this->name_; }
 634
 635   // Return whether this directory is in the sysroot.
 636   bool
 637   is_in_sysroot() const
 638   { return this->is_in_sysroot_; }
 639
 640   // Return whether this is considered a system directory.
 641   bool
 642   is_system_directory() const
 643   { return this->put_in_sysroot_ || this->is_in_sysroot_; }
 644
 645  private:
 646   // The directory name.
 647   std::string name_;
 648   // True if the sysroot should be added as a prefix for this
 649   // directory (if there is a sysroot).  This is true for system
 650   // directories that we search by default.
 651   bool put_in_sysroot_;
 652   // True if this directory is in the sysroot (if there is a sysroot).
 653   // This is true if there is a sysroot and either 1) put_in_sysroot_
 654   // is true, or 2) the directory happens to be in the sysroot based
 655   // on a pathname comparison.
 656   bool is_in_sysroot_;
 657 };
 658
 659 class General_options
 660 {
 661  private:
 662   // NOTE: For every option that you add here, also consider if you
 663   // should add it to Position_dependent_options.
 664   DEFINE_special(help, options::TWO_DASHES, '\0',
 665                  N_("Report usage information"), NULL);
 666   DEFINE_special(version, options::TWO_DASHES, 'v',
 667                  N_("Report version information"), NULL);
 668   DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0',
 669                  N_("Report version and target information"), NULL);
 670
 671   // These options are sorted approximately so that for each letter in
 672   // the alphabet, we show the option whose shortname is that letter
 673   // (if any) and then every longname that starts with that letter (in
 674   // alphabetical order).  For both, lowercase sorts before uppercase.
 675   // The -z options come last.
 676
 677   // a
 678
 679   DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false,
 680               N_("Not supported"),
 681               N_("Do not copy DT_NEEDED tags from shared libraries"));
 682
 683   DEFINE_bool_alias(allow_multiple_definition, muldefs, options::TWO_DASHES,
 684                     '\0',
 685                     N_("Allow multiple definitions of symbols"),
 686                     N_("Do not allow multiple definitions"), false);
 687
 688   DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false,
 689               N_("Allow unresolved references in shared libraries"),
 690               N_("Do not allow unresolved references in shared libraries"));
 691
 692   DEFINE_bool(apply_dynamic_relocs, options::TWO_DASHES, '\0', true,
 693               N_("Apply link-time values for dynamic relocations"),
 694               N_("(aarch64 only) Do not apply link-time values "
 695                  "for dynamic relocations"));
 696
 697   DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false,
 698               N_("Use DT_NEEDED only for shared libraries that are used"),
 699               N_("Use DT_NEEDED for all shared libraries"));
 700
 701   DEFINE_enum(assert, options::ONE_DASH, '\0', NULL,
 702               N_("Ignored"), N_("[ignored]"),
 703               {"definitions", "nodefinitions", "nosymbolic", "pure-text"});
 704
 705   // b
 706
 707   // This should really be an "enum", but it's too easy for folks to
 708   // forget to update the list as they add new targets.  So we just
 709   // accept any string.  We'll fail later (when the string is parsed),
 710   // if the target isn't actually supported.
 711   DEFINE_string(format, options::TWO_DASHES, 'b', "elf",
 712                 N_("Set input format"), ("[elf,binary]"));
 713
 714   DEFINE_bool(be8,options::TWO_DASHES, '\0', false,
 715               N_("Output BE8 format image"), NULL);
 716
 717   DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "tree",
 718                          N_("Generate build ID note"),
 719                          N_("[=STYLE]"));
 720
 721   DEFINE_uint64(build_id_chunk_size_for_treehash,
 722                 options::TWO_DASHES, '\0', 2 << 20,
 723                 N_("Chunk size for '--build-id=tree'"), N_("SIZE"));
 724
 725   DEFINE_uint64(build_id_min_file_size_for_treehash, options::TWO_DASHES,
 726                 '\0', 40 << 20,
 727                 N_("Minimum output file size for '--build-id=tree' to work"
 728                    " differently than '--build-id=sha1'"), N_("SIZE"));
 729
 730   DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true,
 731               N_("-l searches for shared libraries"), NULL);
 732   DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0',
 733                     N_("-l does not search for shared libraries"), NULL,
 734                     true);
 735   DEFINE_bool_alias(dy, Bdynamic, options::ONE_DASH, '\0',
 736                     N_("alias for -Bdynamic"), NULL, false);
 737   DEFINE_bool_alias(dn, Bdynamic, options::ONE_DASH, '\0',
 738                     N_("alias for -Bstatic"), NULL, true);
 739
 740   DEFINE_bool(Bgroup, options::ONE_DASH, '\0', false,
 741               N_("Use group name lookup rules for shared library"), NULL);
 742
 743   DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false,
 744               N_("Generate shared library (alias for -G/-shared)"), NULL);
 745
 746   DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false,
 747               N_("Bind defined symbols locally"), NULL);
 748
 749   DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false,
 750               N_("Bind defined function symbols locally"), NULL);
 751
 752   // c
 753
 754   DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true,
 755               N_("Check segment addresses for overlaps"),
 756               N_("Do not check segment addresses for overlaps"));
 757
 758   DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none",
 759               N_("Compress .debug_* sections in the output file"),
 760               ("[none,zlib,zlib-gnu,zlib-gabi]"),
 761               {"none", "zlib", "zlib-gnu", "zlib-gabi"});
 762
 763   DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false,
 764               N_("Not supported"),
 765               N_("Do not copy DT_NEEDED tags from shared libraries"));
 766
 767   DEFINE_bool(cref, options::TWO_DASHES, '\0', false,
 768               N_("Output cross reference table"),
 769               N_("Do not output cross reference table"));
 770
 771   DEFINE_bool(ctors_in_init_array, options::TWO_DASHES, '\0', true,
 772               N_("Use DT_INIT_ARRAY for all constructors"),
 773               N_("Handle constructors as directed by compiler"));
 774
 775   // d
 776
 777   DEFINE_bool(define_common, options::TWO_DASHES, 'd', false,
 778               N_("Define common symbols"),
 779               N_("Do not define common symbols in relocatable output"));
 780   DEFINE_bool(dc, options::ONE_DASH, '\0', false,
 781               N_("Alias for -d"), NULL);
 782   DEFINE_bool(dp, options::ONE_DASH, '\0', false,
 783               N_("Alias for -d"), NULL);
 784
 785   DEFINE_string(debug, options::TWO_DASHES, '\0', "",
 786                 N_("Turn on debugging"),
 787                 N_("[all,files,script,task][,...]"));
 788
 789   DEFINE_special(defsym, options::TWO_DASHES, '\0',
 790                  N_("Define a symbol"), N_("SYMBOL=EXPRESSION"));
 791
 792   DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL,
 793                          N_("Demangle C++ symbols in log messages"),
 794                          N_("[=STYLE]"));
 795   DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false,
 796               N_("Do not demangle C++ symbols in log messages"),
 797               NULL);
 798
 799   DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false,
 800               N_("Look for violations of the C++ One Definition Rule"),
 801               N_("Do not look for violations of the C++ One Definition Rule"));
 802
 803   DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false,
 804               N_("Add data symbols to dynamic symbols"), NULL);
 805
 806   DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false,
 807               N_("Add C++ operator new/delete to dynamic symbols"), NULL);
 808
 809   DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false,
 810               N_("Add C++ typeinfo to dynamic symbols"), NULL);
 811
 812   DEFINE_special(dynamic_list, options::TWO_DASHES, '\0',
 813                  N_("Read a list of dynamic symbols"), N_("FILE"));
 814
 815   // e
 816
 817   DEFINE_string(entry, options::TWO_DASHES, 'e', NULL,
 818                 N_("Set program start address"), N_("ADDRESS"));
 819
 820   DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false,
 821               N_("Create exception frame header"),
 822               N_("Do not create exception frame header"));
 823
 824   // Alphabetized under 'e' because the option is spelled --enable-new-dtags.
 825   DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true,
 826                 N_("Enable use of DT_RUNPATH"),
 827                 N_("Disable use of DT_RUNPATH"));
 828
 829   DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL,
 830               N_("(ARM only) Do not warn about objects with incompatible "
 831                  "enum sizes"));
 832
 833   DEFINE_special(exclude_libs, options::TWO_DASHES, '\0',
 834                  N_("Exclude libraries from automatic export"),
 835                  N_(("lib,lib ...")));
 836
 837   DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false,
 838               N_("Export all dynamic symbols"),
 839               N_("Do not export all dynamic symbols"));
 840
 841   DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0',
 842              N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL"));
 843
 844   DEFINE_special(EB, options::ONE_DASH, '\0',
 845                  N_("Link big-endian objects."), NULL);
 846   DEFINE_special(EL, options::ONE_DASH, '\0',
 847                  N_("Link little-endian objects."), NULL);
 848
 849   // f
 850
 851   DEFINE_set(auxiliary, options::TWO_DASHES, 'f',
 852              N_("Auxiliary filter for shared object symbol table"),
 853              N_("SHLIB"));
 854
 855   DEFINE_string(filter, options::TWO_DASHES, 'F', NULL,
 856                 N_("Filter for shared object symbol table"),
 857                 N_("SHLIB"));
 858
 859   DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false,
 860               N_("Treat warnings as errors"),
 861               N_("Do not treat warnings as errors"));
 862
 863   DEFINE_string(fini, options::ONE_DASH, '\0', "_fini",
 864                 N_("Call SYMBOL at unload-time"), N_("SYMBOL"));
 865
 866   DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true,
 867               N_("(ARM only) Fix binaries for ARM1176 erratum"),
 868               N_("(ARM only) Do not fix binaries for ARM1176 erratum"));
 869
 870   DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false,
 871               N_("(ARM only) Fix binaries for Cortex-A8 erratum"),
 872               N_("(ARM only) Do not fix binaries for Cortex-A8 erratum"));
 873
 874   DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false,
 875               N_("(AArch64 only) Fix Cortex-A53 erratum 843419"),
 876               N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419"));
 877
 878   DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false,
 879               N_("(AArch64 only) Fix Cortex-A53 erratum 835769"),
 880               N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769"));
 881
 882   DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0',
 883                  N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"),
 884                  NULL);
 885
 886   DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0',
 887                  N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking "
 888                     "veneer"),
 889                  NULL);
 890
 891   DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "",
 892                 N_("Ignored for GCC linker option compatibility"),
 893                 "");
 894
 895   // g
 896
 897   DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false,
 898               N_("Ignored"), NULL);
 899
 900   DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false,
 901               N_("Remove unused sections"),
 902               N_("Don't remove unused sections"));
 903
 904   DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false,
 905               N_("Generate .gdb_index section"),
 906               N_("Do not generate .gdb_index section"));
 907
 908   DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true,
 909               N_("Enable STB_GNU_UNIQUE symbol binding"),
 910               N_("Disable STB_GNU_UNIQUE symbol binding"));
 911
 912   DEFINE_bool(shared, options::ONE_DASH, 'G', false,
 913               N_("Generate shared library"), NULL);
 914
 915   // h
 916
 917   DEFINE_string(soname, options::ONE_DASH, 'h', NULL,
 918                 N_("Set shared library name"), N_("FILENAME"));
 919
 920   DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0,
 921                 N_("Min fraction of empty buckets in dynamic hash"),
 922                 N_("FRACTION"));
 923
 924   DEFINE_enum(hash_style, options::TWO_DASHES, '\0', "sysv",
 925               N_("Dynamic hash style"), N_("[sysv,gnu,both]"),
 926               {"sysv", "gnu", "both"});
 927
 928   // i
 929
 930   DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0',
 931                     N_("Alias for -r"), NULL, false);
 932
 933   DEFINE_enum(icf, options::TWO_DASHES, '\0', "none",
 934               N_("Identical Code Folding. "
 935                  "\'--icf=safe\' Folds ctors, dtors and functions whose"
 936                  " pointers are definitely not taken"),
 937               ("[none,all,safe]"),
 938               {"none", "all", "safe"});
 939
 940   DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0,
 941               N_("Number of iterations of ICF (default 2)"), N_("COUNT"));
 942
 943   DEFINE_special(incremental, options::TWO_DASHES, '\0',
 944                  N_("Do an incremental link if possible; "
 945                     "otherwise, do a full link and prepare output "
 946                     "for incremental linking"), NULL);
 947
 948   DEFINE_special(no_incremental, options::TWO_DASHES, '\0',
 949                  N_("Do a full link (default)"), NULL);
 950
 951   DEFINE_special(incremental_full, options::TWO_DASHES, '\0',
 952                  N_("Do a full link and "
 953                     "prepare output for incremental linking"), NULL);
 954
 955   DEFINE_special(incremental_update, options::TWO_DASHES, '\0',
 956                  N_("Do an incremental link; exit if not possible"), NULL);
 957
 958   DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL,
 959                 N_("Set base file for incremental linking"
 960                    " (default is output file)"),
 961                 N_("FILE"));
 962
 963   DEFINE_special(incremental_changed, options::TWO_DASHES, '\0',
 964                  N_("Assume files changed"), NULL);
 965
 966   DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0',
 967                  N_("Assume files didn't change"), NULL);
 968
 969   DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0',
 970                  N_("Use timestamps to check files (default)"), NULL);
 971
 972   DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0',
 973                  N_("Assume startup files unchanged "
 974                     "(files preceding this option)"), NULL);
 975
 976   DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10,
 977                  N_("Amount of extra space to allocate for patches "
 978                     "(default 10)"),
 979                  N_("PERCENT"));
 980
 981   DEFINE_string(init, options::ONE_DASH, '\0', "_init",
 982                 N_("Call SYMBOL at load-time"), N_("SYMBOL"));
 983
 984   DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL,
 985                 N_("Set dynamic linker path"), N_("PROGRAM"));
 986
 987   // j
 988
 989   DEFINE_special(just_symbols, options::TWO_DASHES, '\0',
 990                  N_("Read only symbol values from FILE"), N_("FILE"));
 991
 992   // k
 993
 994   DEFINE_bool(keep_files_mapped, options::TWO_DASHES, '\0', true,
 995               N_("Keep files mapped across passes"),
 996               N_("Release mapped files after each pass"));
 997
 998   DEFINE_set(keep_unique, options::TWO_DASHES, '\0',
 999              N_("Do not fold this symbol during ICF"), N_("SYMBOL"));
1000
1001   // l
1002
1003   DEFINE_special(library, options::TWO_DASHES, 'l',
1004                  N_("Search for library LIBNAME"), N_("LIBNAME"));
1005
1006   DEFINE_bool(ld_generated_unwind_info, options::TWO_DASHES, '\0', true,
1007               N_("Generate unwind information for PLT"),
1008               N_("Do not generate unwind information for PLT"));
1009
1010   DEFINE_dirlist(library_path, options::TWO_DASHES, 'L',
1011                  N_("Add directory to search path"), N_("DIR"));
1012
1013   DEFINE_bool(long_plt, options::TWO_DASHES, '\0', false,
1014               N_("(ARM only) Generate long PLT entries"),
1015               N_("(ARM only) Do not generate long PLT entries"));
1016
1017   // m
1018
1019   DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "",
1020                 N_("Set GNU linker emulation; obsolete"), N_("EMULATION"));
1021
1022   DEFINE_bool(map_whole_files, options::TWO_DASHES, '\0',
1023               sizeof(void*) >= 8,
1024               N_("Map whole files to memory"),
1025               N_("Map relevant file parts to memory"));
1026
1027   DEFINE_bool(merge_exidx_entries, options::TWO_DASHES, '\0', true,
1028               N_("(ARM only) Merge exidx entries in debuginfo"),
1029               N_("(ARM only) Do not merge exidx entries in debuginfo"));
1030
1031   DEFINE_bool(mmap_output_file, options::TWO_DASHES, '\0', true,
1032               N_("Map the output file for writing"),
1033               N_("Do not map the output file for writing"));
1034
1035   DEFINE_bool(print_map, options::TWO_DASHES, 'M', false,
1036               N_("Write map file on standard output"), NULL);
1037
1038   DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"),
1039                 N_("MAPFILENAME"));
1040
1041   // n
1042
1043   DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false,
1044               N_("Do not page align data"), NULL);
1045   DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false,
1046               N_("Do not page align data, do not make text readonly"),
1047               N_("Page align data, make text readonly"));
1048
1049   DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false,
1050               N_("Use less memory and more disk I/O "
1051                  "(included only for compatibility with GNU ld)"), NULL);
1052
1053   DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0',
1054                     N_("Report undefined symbols (even with --shared)"),
1055                     NULL, false);
1056
1057   DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false,
1058               N_("Create an output file even if errors occur"), NULL);
1059
1060   DEFINE_bool(nostdlib, options::ONE_DASH, '\0', false,
1061               N_("Only search directories specified on the command line"),
1062               NULL);
1063
1064   // o
1065
1066   DEFINE_string(output, options::TWO_DASHES, 'o', "a.out",
1067                 N_("Set output file name"), N_("FILE"));
1068
1069   DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf",
1070                 N_("Set output format"), N_("[binary]"));
1071
1072   DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0,
1073               N_("Optimize output file size"), N_("LEVEL"));
1074
1075   // p
1076
1077   DEFINE_bool(p, options::ONE_DASH, 'p', false,
1078               N_("Ignored for ARM compatibility"), NULL);
1079
1080   DEFINE_bool(pie, options::ONE_DASH, '\0', false,
1081               N_("Create a position independent executable"),
1082               N_("Do not create a position independent executable"));
1083   DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0',
1084                     N_("Create a position independent executable"),
1085                     N_("Do not create a position independent executable"),
1086                     false);
1087
1088   DEFINE_bool(pic_veneer, options::TWO_DASHES, '\0', false,
1089               N_("Force PIC sequences for ARM/Thumb interworking veneers"),
1090               NULL);
1091
1092   DEFINE_bool(pipeline_knowledge, options::ONE_DASH, '\0', false,
1093               NULL, N_("(ARM only) Ignore for backward compatibility"));
1094
1095   DEFINE_var(plt_align, options::TWO_DASHES, '\0', 0, "5",
1096              N_("(PowerPC64 only) Align PLT call stubs to fit cache lines"),
1097              N_("[=P2ALIGN]"), true, int, int, options::parse_uint, false);
1098
1099   DEFINE_bool(plt_static_chain, options::TWO_DASHES, '\0', false,
1100               N_("(PowerPC64 only) PLT call stubs should load r11"),
1101               N_("(PowerPC64 only) PLT call stubs should not load r11"));
1102
1103   DEFINE_bool(plt_thread_safe, options::TWO_DASHES, '\0', false,
1104               N_("(PowerPC64 only) PLT call stubs with load-load barrier"),
1105               N_("(PowerPC64 only) PLT call stubs without barrier"));
1106
1107 #ifdef ENABLE_PLUGINS
1108   DEFINE_special(plugin, options::TWO_DASHES, '\0',
1109                  N_("Load a plugin library"), N_("PLUGIN"));
1110   DEFINE_special(plugin_opt, options::TWO_DASHES, '\0',
1111                  N_("Pass an option to the plugin"), N_("OPTION"));
1112 #endif
1113
1114   DEFINE_bool(posix_fallocate, options::TWO_DASHES, '\0', true,
1115               N_("Use posix_fallocate to reserve space in the output file"),
1116               N_("Use fallocate or ftruncate to reserve space"));
1117
1118   DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false,
1119               N_("Preread archive symbols when multi-threaded"), NULL);
1120
1121   DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false,
1122               N_("List removed unused sections on stderr"),
1123               N_("Do not list removed unused sections"));
1124
1125   DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false,
1126               N_("List folded identical sections on stderr"),
1127               N_("Do not list folded identical sections"));
1128
1129   DEFINE_bool(print_output_format, options::TWO_DASHES, '\0', false,
1130               N_("Print default output format"), NULL);
1131
1132   DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL,
1133                 N_("Print symbols defined and used for each input"),
1134                 N_("FILENAME"));
1135
1136   DEFINE_special(push_state, options::TWO_DASHES, '\0',
1137                  N_("Save the state of flags related to input files"), NULL);
1138   DEFINE_special(pop_state, options::TWO_DASHES, '\0',
1139                  N_("Restore the state of flags related to input files"), NULL);
1140
1141   // q
1142
1143   DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false,
1144               N_("Generate relocations in output"), NULL);
1145
1146   DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false,
1147               N_("Ignored for SVR4 compatibility"), NULL);
1148
1149   // r
1150
1151   DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false,
1152               N_("Generate relocatable output"), NULL);
1153
1154   DEFINE_bool(relax, options::TWO_DASHES, '\0', false,
1155               N_("Relax branches on certain targets"), NULL);
1156
1157   DEFINE_string(retain_symbols_file, options::TWO_DASHES, '\0', NULL,
1158                 N_("keep only symbols listed in this file"), N_("FILE"));
1159
1160   DEFINE_bool(rosegment, options::TWO_DASHES, '\0', false,
1161               N_("Put read-only non-executable sections in their own segment"),
1162               NULL);
1163
1164   DEFINE_uint64(rosegment_gap, options::TWO_DASHES, '\0', -1U,
1165                 N_("Set offset between executable and read-only segments"),
1166                 N_("OFFSET"));
1167
1168   // -R really means -rpath, but can mean --just-symbols for
1169   // compatibility with GNU ld.  -rpath is always -rpath, so we list
1170   // it separately.
1171   DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R',
1172                  N_("Add DIR to runtime search path"), N_("DIR"));
1173
1174   DEFINE_dirlist(rpath, options::ONE_DASH, '\0',
1175                  N_("Add DIR to runtime search path"), N_("DIR"));
1176
1177   DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0',
1178                  N_("Add DIR to link time shared library search path"),
1179                  N_("DIR"));
1180
1181   // s
1182
1183   DEFINE_bool(strip_all, options::TWO_DASHES, 's', false,
1184               N_("Strip all symbols"), NULL);
1185   DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false,
1186               N_("Strip debugging information"), NULL);
1187   DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false,
1188               N_("Emit only debug line number information"), NULL);
1189   DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false,
1190               N_("Strip debug symbols that are unused by gdb "
1191                  "(at least versions <= 7.4)"), NULL);
1192   DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true,
1193               N_("Strip LTO intermediate code sections"), NULL);
1194
1195   DEFINE_string(section_ordering_file, options::TWO_DASHES, '\0', NULL,
1196                 N_("Layout sections in the order specified"),
1197                 N_("FILENAME"));
1198
1199   DEFINE_special(section_start, options::TWO_DASHES, '\0',
1200                  N_("Set address of section"), N_("SECTION=ADDRESS"));
1201
1202   DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL,
1203                          N_("Sort common symbols by alignment"),
1204                          N_("[={ascending,descending}]"));
1205
1206   DEFINE_enum(sort_section, options::TWO_DASHES, '\0', "none",
1207               N_("Sort sections by name.  \'--no-text-reorder\'"
1208                  " will override \'--sort-section=name\' for .text"),
1209               N_("[none,name]"),
1210               {"none", "name"});
1211
1212   DEFINE_uint(spare_dynamic_tags, options::TWO_DASHES, '\0', 5,
1213               N_("Dynamic tag slots to reserve (default 5)"),
1214               N_("COUNT"));
1215
1216   DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1,
1217              N_("(ARM, PowerPC only) The maximum distance from instructions "
1218                 "in a group of sections to their stubs. Negative values mean "
1219                 "stubs are always after the group. 1 means use default size"),
1220              N_("SIZE"));
1221
1222   DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x4000,
1223               N_("Stack size when -fsplit-stack function calls non-split"),
1224               N_("SIZE"));
1225
1226   // This is not actually special in any way, but I need to give it
1227   // a non-standard accessor-function name because 'static' is a keyword.
1228   DEFINE_special(static, options::ONE_DASH, '\0',
1229                  N_("Do not link against shared libraries"), NULL);
1230
1231   DEFINE_special(start_lib, options::TWO_DASHES, '\0',
1232                  N_("Start a library"), NULL);
1233   DEFINE_special(end_lib, options::TWO_DASHES, '\0',
1234                  N_("End a library "), NULL);
1235
1236   DEFINE_bool(stats, options::TWO_DASHES, '\0', false,
1237               N_("Print resource usage statistics"), NULL);
1238
1239   DEFINE_string(sysroot, options::TWO_DASHES, '\0', "",
1240                 N_("Set target system root directory"), N_("DIR"));
1241
1242   // t
1243
1244   DEFINE_bool(trace, options::TWO_DASHES, 't', false,
1245               N_("Print the name of each input file"), NULL);
1246
1247   DEFINE_bool(target1_abs, options::TWO_DASHES, '\0', false,
1248               N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_ABS32"),
1249               NULL);
1250   DEFINE_bool(target1_rel, options::TWO_DASHES, '\0', false,
1251               N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_REL32"),
1252               NULL);
1253   DEFINE_enum(target2, options::TWO_DASHES, '\0', NULL,
1254               N_("(ARM only) Set R_ARM_TARGET2 relocation type"),
1255               N_("[rel, abs, got-rel"),
1256               {"rel", "abs", "got-rel"});
1257
1258   DEFINE_bool(text_reorder, options::TWO_DASHES, '\0', true,
1259               N_("Enable text section reordering for GCC section names"),
1260               N_("Disable text section reordering for GCC section names"));
1261
1262   DEFINE_bool(threads, options::TWO_DASHES, '\0', false,
1263               N_("Run the linker multi-threaded"),
1264               N_("Do not run the linker multi-threaded"));
1265   DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0,
1266               N_("Number of threads to use"), N_("COUNT"));
1267   DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0,
1268               N_("Number of threads to use in initial pass"), N_("COUNT"));
1269   DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0,
1270               N_("Number of threads to use in middle pass"), N_("COUNT"));
1271   DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0,
1272               N_("Number of threads to use in final pass"), N_("COUNT"));
1273
1274   DEFINE_bool(toc_optimize, options::TWO_DASHES, '\0', true,
1275               N_("(PowerPC64 only) Optimize TOC code sequences"),
1276               N_("(PowerPC64 only) Don't optimize TOC code sequences"));
1277
1278   DEFINE_bool(toc_sort, options::TWO_DASHES, '\0', true,
1279               N_("(PowerPC64 only) Sort TOC and GOT sections"),
1280               N_("(PowerPC64 only) Don't sort TOC and GOT sections"));
1281
1282   DEFINE_special(script, options::TWO_DASHES, 'T',
1283                  N_("Read linker script"), N_("FILE"));
1284
1285   DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U,
1286                 N_("Set the address of the bss segment"), N_("ADDRESS"));
1287   DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U,
1288                 N_("Set the address of the data segment"), N_("ADDRESS"));
1289   DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U,
1290                 N_("Set the address of the text segment"), N_("ADDRESS"));
1291   DEFINE_uint64_alias(Ttext_segment, Ttext, options::ONE_DASH, '\0',
1292                       N_("Set the address of the text segment"),
1293                       N_("ADDRESS"));
1294   DEFINE_uint64(Trodata_segment, options::ONE_DASH, '\0', -1U,
1295                 N_("Set the address of the rodata segment"), N_("ADDRESS"));
1296
1297   // u
1298
1299   DEFINE_set(undefined, options::TWO_DASHES, 'u',
1300              N_("Create undefined reference to SYMBOL"), N_("SYMBOL"));
1301
1302   DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL,
1303               N_("How to handle unresolved symbols"),
1304               ("ignore-all,report-all,ignore-in-object-files,"
1305                "ignore-in-shared-libs"),
1306               {"ignore-all", "report-all", "ignore-in-object-files",
1307                   "ignore-in-shared-libs"});
1308
1309   // v
1310
1311   DEFINE_bool(verbose, options::TWO_DASHES, '\0', false,
1312               N_("Alias for --debug=files"), NULL);
1313
1314   DEFINE_special(version_script, options::TWO_DASHES, '\0',
1315                  N_("Read version script"), N_("FILE"));
1316
1317   // w
1318
1319   DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false,
1320               N_("Warn about duplicate common symbols"),
1321               N_("Do not warn about duplicate common symbols"));
1322
1323   DEFINE_bool_ignore(warn_constructors, options::TWO_DASHES, '\0',
1324                      N_("Ignored"), N_("Ignored"));
1325
1326   DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false,
1327               N_("Warn if the stack is executable"),
1328               N_("Do not warn if the stack is executable"));
1329
1330   DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true,
1331               NULL, N_("Don't warn about mismatched input files"));
1332
1333   DEFINE_bool(warn_multiple_gp, options::TWO_DASHES, '\0', false,
1334               N_("Ignored"), NULL);
1335
1336   DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true,
1337               N_("Warn when skipping an incompatible library"),
1338               N_("Don't warn when skipping an incompatible library"));
1339
1340   DEFINE_bool(warn_shared_textrel, options::TWO_DASHES, '\0', false,
1341               N_("Warn if text segment is not shareable"),
1342               N_("Do not warn if text segment is not shareable"));
1343
1344   DEFINE_bool(warn_unresolved_symbols, options::TWO_DASHES, '\0', false,
1345               N_("Report unresolved symbols as warnings"),
1346               NULL);
1347   DEFINE_bool_alias(error_unresolved_symbols, warn_unresolved_symbols,
1348                     options::TWO_DASHES, '\0',
1349                     N_("Report unresolved symbols as errors"),
1350                     NULL, true);
1351
1352   DEFINE_bool(wchar_size_warning, options::TWO_DASHES, '\0', true, NULL,
1353               N_("(ARM only) Do not warn about objects with incompatible "
1354                  "wchar_t sizes"));
1355
1356   DEFINE_bool(weak_unresolved_symbols, options::TWO_DASHES, '\0', false,
1357               N_("Convert unresolved symbols to weak references"),
1358               NULL);
1359
1360   DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false,
1361               N_("Include all archive contents"),
1362               N_("Include only needed archive contents"));
1363
1364   DEFINE_set(wrap, options::TWO_DASHES, '\0',
1365              N_("Use wrapper functions for SYMBOL"), N_("SYMBOL"));
1366
1367   // x
1368
1369   DEFINE_special(discard_all, options::TWO_DASHES, 'x',
1370                  N_("Delete all local symbols"), NULL);
1371   DEFINE_special(discard_locals, options::TWO_DASHES, 'X',
1372                  N_("Delete all temporary local symbols"), NULL);
1373   DEFINE_special(discard_none, options::TWO_DASHES, '\0',
1374                  N_("Keep all local symbols"), NULL);
1375
1376   // y
1377
1378   DEFINE_set(trace_symbol, options::TWO_DASHES, 'y',
1379              N_("Trace references to symbol"), N_("SYMBOL"));
1380
1381   DEFINE_bool(undefined_version, options::TWO_DASHES, '\0', true,
1382               N_("Allow unused version in script"),
1383               N_("Do not allow unused version in script"));
1384
1385   DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "",
1386                 N_("Default search path for Solaris compatibility"),
1387                 N_("PATH"));
1388
1389   // special characters
1390
1391   DEFINE_special(start_group, options::TWO_DASHES, '(',
1392                  N_("Start a library search group"), NULL);
1393   DEFINE_special(end_group, options::TWO_DASHES, ')',
1394                  N_("End a library search group"), NULL);
1395
1396   // The -z options.
1397
1398   DEFINE_bool(combreloc, options::DASH_Z, '\0', true,
1399               N_("Sort dynamic relocs"),
1400               N_("Do not sort dynamic relocs"));
1401   DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0,
1402                 N_("Set common page size to SIZE"), N_("SIZE"));
1403   DEFINE_bool(defs, options::DASH_Z, '\0', false,
1404               N_("Report undefined symbols (even with --shared)"),
1405               NULL);
1406   DEFINE_bool(execstack, options::DASH_Z, '\0', false,
1407               N_("Mark output as requiring executable stack"), NULL);
1408   DEFINE_bool(global, options::DASH_Z, '\0', false,
1409               N_("Make symbols in DSO available for subsequently loaded "
1410                  "objects"), NULL);
1411   DEFINE_bool(initfirst, options::DASH_Z, '\0', false,
1412               N_("Mark DSO to be initialized first at runtime"),
1413               NULL);
1414   DEFINE_bool(interpose, options::DASH_Z, '\0', false,
1415               N_("Mark object to interpose all DSOs but executable"),
1416               NULL);
1417   DEFINE_bool_alias(lazy, now, options::DASH_Z, '\0',
1418                     N_("Mark object for lazy runtime binding"),
1419                     NULL, true);
1420   DEFINE_bool(loadfltr, options::DASH_Z, '\0', false,
1421               N_("Mark object requiring immediate process"),
1422               NULL);
1423   DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0,
1424                 N_("Set maximum page size to SIZE"), N_("SIZE"));
1425   DEFINE_bool(muldefs, options::DASH_Z, '\0', false,
1426               N_("Allow multiple definitions of symbols"),
1427               NULL);
1428   // copyreloc is here in the list because there is only -z
1429   // nocopyreloc, not -z copyreloc.
1430   DEFINE_bool(copyreloc, options::DASH_Z, '\0', true,
1431               NULL,
1432               N_("Do not create copy relocs"));
1433   DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false,
1434               N_("Mark object not to use default search paths"),
1435               NULL);
1436   DEFINE_bool(nodelete, options::DASH_Z, '\0', false,
1437               N_("Mark DSO non-deletable at runtime"),
1438               NULL);
1439   DEFINE_bool(nodlopen, options::DASH_Z, '\0', false,
1440               N_("Mark DSO not available to dlopen"),
1441               NULL);
1442   DEFINE_bool(nodump, options::DASH_Z, '\0', false,
1443               N_("Mark DSO not available to dldump"),
1444               NULL);
1445   DEFINE_bool(noexecstack, options::DASH_Z, '\0', false,
1446               N_("Mark output as not requiring executable stack"), NULL);
1447   DEFINE_bool(now, options::DASH_Z, '\0', false,
1448               N_("Mark object for immediate function binding"),
1449               NULL);
1450   DEFINE_bool(origin, options::DASH_Z, '\0', false,
1451               N_("Mark DSO to indicate that needs immediate $ORIGIN "
1452                  "processing at runtime"), NULL);
1453   DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO,
1454               N_("Where possible mark variables read-only after relocation"),
1455               N_("Don't mark variables read-only after relocation"));
1456   DEFINE_uint64(stack_size, options::DASH_Z, '\0', 0,
1457                 N_("Set PT_GNU_STACK segment p_memsz to SIZE"), N_("SIZE"));
1458   DEFINE_bool(text, options::DASH_Z, '\0', false,
1459               N_("Do not permit relocations in read-only segments"),
1460               N_("Permit relocations in read-only segments"));
1461   DEFINE_bool_alias(textoff, text, options::DASH_Z, '\0',
1462                     N_("Permit relocations in read-only segments"),
1463                     NULL, true);
1464
1465  public:
1466   typedef options::Dir_list Dir_list;
1467
1468   General_options();
1469
1470   // Does post-processing on flags, making sure they all have
1471   // non-conflicting values.  Also converts some flags from their
1472   // "standard" types (string, etc), to another type (enum, DirList),
1473   // which can be accessed via a separate method.  Dies if it notices
1474   // any problems.
1475   void finalize();
1476
1477   // True if we printed the version information.
1478   bool
1479   printed_version() const
1480   { return this->printed_version_; }
1481
1482   // The macro defines output() (based on --output), but that's a
1483   // generic name.  Provide this alternative name, which is clearer.
1484   const char*
1485   output_file_name() const
1486   { return this->output(); }
1487
1488   // This is not defined via a flag, but combines flags to say whether
1489   // the output is position-independent or not.
1490   bool
1491   output_is_position_independent() const
1492   { return this->shared() || this->pie(); }
1493
1494   // Return true if the output is something that can be exec()ed, such
1495   // as a static executable, or a position-dependent or
1496   // position-independent executable, but not a dynamic library or an
1497   // object file.
1498   bool
1499   output_is_executable() const
1500   { return !this->shared() && !this->relocatable(); }
1501
1502   // This would normally be static(), and defined automatically, but
1503   // since static is a keyword, we need to come up with our own name.
1504   bool
1505   is_static() const
1506   { return static_; }
1507
1508   // In addition to getting the input and output formats as a string
1509   // (via format() and oformat()), we also give access as an enum.
1510   enum Object_format
1511   {
1512     // Ordinary ELF.
1513     OBJECT_FORMAT_ELF,
1514     // Straight binary format.
1515     OBJECT_FORMAT_BINARY
1516   };
1517
1518   // Convert a string to an Object_format.  Gives an error if the
1519   // string is not recognized.
1520   static Object_format
1521   string_to_object_format(const char* arg);
1522
1523   // Convert an Object_format to string.
1524   static const char*
1525   object_format_to_string(Object_format);
1526
1527   // Note: these functions are not very fast.
1528   Object_format format_enum() const;
1529   Object_format oformat_enum() const;
1530
1531   // Return whether FILENAME is in a system directory.
1532   bool
1533   is_in_system_directory(const std::string& name) const;
1534
1535   // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_.
1536   bool
1537   should_retain_symbol(const char* symbol_name) const
1538     {
1539       if (symbols_to_retain_.empty())    // means flag wasn't specified
1540         return true;
1541       return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end();
1542     }
1543
1544   // These are the best way to get access to the execstack state,
1545   // not execstack() and noexecstack() which are hard to use properly.
1546   bool
1547   is_execstack_set() const
1548   { return this->execstack_status_ != EXECSTACK_FROM_INPUT; }
1549
1550   bool
1551   is_stack_executable() const
1552   { return this->execstack_status_ == EXECSTACK_YES; }
1553
1554   bool
1555   icf_enabled() const
1556   { return this->icf_status_ != ICF_NONE; }
1557
1558   bool
1559   icf_safe_folding() const
1560   { return this->icf_status_ == ICF_SAFE; }
1561
1562   // The --demangle option takes an optional string, and there is also
1563   // a --no-demangle option.  This is the best way to decide whether
1564   // to demangle or not.
1565   bool
1566   do_demangle() const
1567   { return this->do_demangle_; }
1568
1569   // Returns TRUE if any plugin libraries have been loaded.
1570   bool
1571   has_plugins() const
1572   { return this->plugins_ != NULL; }
1573
1574   // Return a pointer to the plugin manager.
1575   Plugin_manager*
1576   plugins() const
1577   { return this->plugins_; }
1578
1579   // True iff SYMBOL was found in the file specified by dynamic-list.
1580   bool
1581   in_dynamic_list(const char* symbol) const
1582   { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); }
1583
1584   // True if a --dynamic-list script was provided.
1585   bool
1586   have_dynamic_list() const
1587   { return this->have_dynamic_list_; }
1588
1589   // Finalize the dynamic list.
1590   void
1591   finalize_dynamic_list()
1592   { this->dynamic_list_.version_script_info()->finalize(); }
1593
1594   // The mode selected by the --incremental options.
1595   enum Incremental_mode
1596   {
1597     // No incremental linking (--no-incremental).
1598     INCREMENTAL_OFF,
1599     // Incremental update only (--incremental-update).
1600     INCREMENTAL_UPDATE,
1601     // Force a full link, but prepare for subsequent incremental link
1602     // (--incremental-full).
1603     INCREMENTAL_FULL,
1604     // Incremental update if possible, fallback to full link  (--incremental).
1605     INCREMENTAL_AUTO
1606   };
1607
1608   // The incremental linking mode.
1609   Incremental_mode
1610   incremental_mode() const
1611   { return this->incremental_mode_; }
1612
1613   // The disposition given by the --incremental-changed,
1614   // --incremental-unchanged or --incremental-unknown option.  The
1615   // value may change as we proceed parsing the command line flags.
1616   Incremental_disposition
1617   incremental_disposition() const
1618   { return this->incremental_disposition_; }
1619
1620   void
1621   set_incremental_disposition(Incremental_disposition disp)
1622   { this->incremental_disposition_ = disp; }
1623
1624   // The disposition to use for startup files (those that precede the
1625   // first --incremental-changed, etc. option).
1626   Incremental_disposition
1627   incremental_startup_disposition() const
1628   { return this->incremental_startup_disposition_; }
1629
1630   // Return true if S is the name of a library excluded from automatic
1631   // symbol export.
1632   bool
1633   check_excluded_libs(const std::string &s) const;
1634
1635   // If an explicit start address was given for section SECNAME with
1636   // the --section-start option, return true and set *PADDR to the
1637   // address.  Otherwise return false.
1638   bool
1639   section_start(const char* secname, uint64_t* paddr) const;
1640
1641   // Return whether any --section-start option was used.
1642   bool
1643   any_section_start() const
1644   { return !this->section_starts_.empty(); }
1645
1646   enum Fix_v4bx
1647   {
1648     // Leave original instruction.
1649     FIX_V4BX_NONE,
1650     // Replace instruction.
1651     FIX_V4BX_REPLACE,
1652     // Generate an interworking veneer.
1653     FIX_V4BX_INTERWORKING
1654   };
1655
1656   Fix_v4bx
1657   fix_v4bx() const
1658   { return (this->fix_v4bx_); }
1659
1660   enum Endianness
1661   {
1662     ENDIANNESS_NOT_SET,
1663     ENDIANNESS_BIG,
1664     ENDIANNESS_LITTLE
1665   };
1666
1667   Endianness
1668   endianness() const
1669   { return this->endianness_; }
1670
1671   bool
1672   discard_all() const
1673   { return this->discard_locals_ == DISCARD_ALL; }
1674
1675   bool
1676   discard_locals() const
1677   { return this->discard_locals_ == DISCARD_LOCALS; }
1678
1679   bool
1680   discard_sec_merge() const
1681   { return this->discard_locals_ == DISCARD_SEC_MERGE; }
1682
1683  private:
1684   // Don't copy this structure.
1685   General_options(const General_options&);
1686   General_options& operator=(const General_options&);
1687
1688   // What local symbols to discard.
1689   enum Discard_locals
1690   {
1691     // Locals in merge sections (default).
1692     DISCARD_SEC_MERGE,
1693     // None (--discard-none).
1694     DISCARD_NONE,
1695     // Temporary locals (--discard-locals/-X).
1696     DISCARD_LOCALS,
1697     // All locals (--discard-all/-x).
1698     DISCARD_ALL
1699   };
1700
1701   // Whether to mark the stack as executable.
1702   enum Execstack
1703   {
1704     // Not set on command line.
1705     EXECSTACK_FROM_INPUT,
1706     // Mark the stack as executable (-z execstack).
1707     EXECSTACK_YES,
1708     // Mark the stack as not executable (-z noexecstack).
1709     EXECSTACK_NO
1710   };
1711
1712   enum Icf_status
1713   {
1714     // Do not fold any functions (Default or --icf=none).
1715     ICF_NONE,
1716     // All functions are candidates for folding. (--icf=all).
1717     ICF_ALL,
1718     // Only ctors and dtors are candidates for folding. (--icf=safe).
1719     ICF_SAFE
1720   };
1721
1722   void
1723   set_icf_status(Icf_status value)
1724   { this->icf_status_ = value; }
1725
1726   void
1727   set_execstack_status(Execstack value)
1728   { this->execstack_status_ = value; }
1729
1730   void
1731   set_do_demangle(bool value)
1732   { this->do_demangle_ = value; }
1733
1734   void
1735   set_static(bool value)
1736   { static_ = value; }
1737
1738   // These are called by finalize() to set up the search-path correctly.
1739   void
1740   add_to_library_path_with_sysroot(const std::string& arg)
1741   { this->add_search_directory_to_library_path(Search_directory(arg, true)); }
1742
1743   // Apply any sysroot to the directory lists.
1744   void
1745   add_sysroot();
1746
1747   // Add a plugin and its arguments to the list of plugins.
1748   void
1749   add_plugin(const char* filename);
1750
1751   // Add a plugin option.
1752   void
1753   add_plugin_option(const char* opt);
1754
1755   void
1756   copy_from_posdep_options(const Position_dependent_options&);
1757
1758   // Whether we printed version information.
1759   bool printed_version_;
1760   // Whether to mark the stack as executable.
1761   Execstack execstack_status_;
1762   // Whether to do code folding.
1763   Icf_status icf_status_;
1764   // Whether to do a static link.
1765   bool static_;
1766   // Whether to do demangling.
1767   bool do_demangle_;
1768   // List of plugin libraries.
1769   Plugin_manager* plugins_;
1770   // The parsed output of --dynamic-list files.  For convenience in
1771   // script.cc, we store this as a Script_options object, even though
1772   // we only use a single Version_tree from it.
1773   Script_options dynamic_list_;
1774   // Whether a --dynamic-list file was provided.
1775   bool have_dynamic_list_;
1776   // The incremental linking mode.
1777   Incremental_mode incremental_mode_;
1778   // The disposition given by the --incremental-changed,
1779   // --incremental-unchanged or --incremental-unknown option.  The
1780   // value may change as we proceed parsing the command line flags.
1781   Incremental_disposition incremental_disposition_;
1782   // The disposition to use for startup files (those marked
1783   // INCREMENTAL_STARTUP).
1784   Incremental_disposition incremental_startup_disposition_;
1785   // Whether we have seen one of the options that require incremental
1786   // build (--incremental-changed, --incremental-unchanged,
1787   // --incremental-unknown, or --incremental-startup-unchanged).
1788   bool implicit_incremental_;
1789   // Libraries excluded from automatic export, via --exclude-libs.
1790   Unordered_set<std::string> excluded_libs_;
1791   // List of symbol-names to keep, via -retain-symbol-info.
1792   Unordered_set<std::string> symbols_to_retain_;
1793   // Map from section name to address from --section-start.
1794   std::map<std::string, uint64_t> section_starts_;
1795   // Whether to process armv4 bx instruction relocation.
1796   Fix_v4bx fix_v4bx_;
1797   // Endianness.
1798   Endianness endianness_;
1799   // What local symbols to discard.
1800   Discard_locals discard_locals_;
1801   // Stack of saved options for --push-state/--pop-state.
1802   std::vector<Position_dependent_options*> options_stack_;
1803 };
1804
1805 // The position-dependent options.  We use this to store the state of
1806 // the commandline at a particular point in parsing for later
1807 // reference.  For instance, if we see "ld --whole-archive foo.a
1808 // --no-whole-archive," we want to store the whole-archive option with
1809 // foo.a, so when the time comes to parse foo.a we know we should do
1810 // it in whole-archive mode.  We could store all of General_options,
1811 // but that's big, so we just pick the subset of flags that actually
1812 // change in a position-dependent way.
1813
1814 #define DEFINE_posdep(varname__, type__)        \
1815  public:                                        \
1816   type__                                        \
1817   varname__() const                             \
1818   { return this->varname__##_; }                \
1819                                                 \
1820   void                                          \
1821   set_##varname__(type__ value)                 \
1822   { this->varname__##_ = value; }               \
1823  private:                                       \
1824   type__ varname__##_
1825
1826 class Position_dependent_options
1827 {
1828  public:
1829   Position_dependent_options(const General_options& options
1830                              = Position_dependent_options::default_options_)
1831   { copy_from_options(options); }
1832
1833   void
1834   copy_from_options(const General_options& options)
1835   {
1836     this->set_as_needed(options.as_needed());
1837     this->set_Bdynamic(options.Bdynamic());
1838     this->set_format_enum(options.format_enum());
1839     this->set_whole_archive(options.whole_archive());
1840     this->set_incremental_disposition(options.incremental_disposition());
1841   }
1842
1843   DEFINE_posdep(as_needed, bool);
1844   DEFINE_posdep(Bdynamic, bool);
1845   DEFINE_posdep(format_enum, General_options::Object_format);
1846   DEFINE_posdep(whole_archive, bool);
1847   DEFINE_posdep(incremental_disposition, Incremental_disposition);
1848
1849  private:
1850   // This is a General_options with everything set to its default
1851   // value.  A Position_dependent_options created with no argument
1852   // will take its values from here.
1853   static General_options default_options_;
1854 };
1855
1856
1857 // A single file or library argument from the command line.
1858
1859 class Input_file_argument
1860 {
1861  public:
1862   enum Input_file_type
1863   {
1864     // A regular file, name used as-is, not searched.
1865     INPUT_FILE_TYPE_FILE,
1866     // A library name.  When used, "lib" will be prepended and ".so" or
1867     // ".a" appended to make a filename, and that filename will be searched
1868     // for using the -L paths.
1869     INPUT_FILE_TYPE_LIBRARY,
1870     // A regular file, name used as-is, but searched using the -L paths.
1871     INPUT_FILE_TYPE_SEARCHED_FILE
1872   };
1873
1874   // name: file name or library name
1875   // type: the type of this input file.
1876   // extra_search_path: an extra directory to look for the file, prior
1877   //         to checking the normal library search path.  If this is "",
1878   //         then no extra directory is added.
1879   // just_symbols: whether this file only defines symbols.
1880   // options: The position dependent options at this point in the
1881   //         command line, such as --whole-archive.
1882   Input_file_argument()
1883     : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""),
1884       just_symbols_(false), options_(), arg_serial_(0)
1885   { }
1886
1887   Input_file_argument(const char* name, Input_file_type type,
1888                       const char* extra_search_path,
1889                       bool just_symbols,
1890                       const Position_dependent_options& options)
1891     : name_(name), type_(type), extra_search_path_(extra_search_path),
1892       just_symbols_(just_symbols), options_(options), arg_serial_(0)
1893   { }
1894
1895   // You can also pass in a General_options instance instead of a
1896   // Position_dependent_options.  In that case, we extract the
1897   // position-independent vars from the General_options and only store
1898   // those.
1899   Input_file_argument(const char* name, Input_file_type type,
1900                       const char* extra_search_path,
1901                       bool just_symbols,
1902                       const General_options& options)
1903     : name_(name), type_(type), extra_search_path_(extra_search_path),
1904       just_symbols_(just_symbols), options_(options), arg_serial_(0)
1905   { }
1906
1907   const char*
1908   name() const
1909   { return this->name_.c_str(); }
1910
1911   const Position_dependent_options&
1912   options() const
1913   { return this->options_; }
1914
1915   bool
1916   is_lib() const
1917   { return type_ == INPUT_FILE_TYPE_LIBRARY; }
1918
1919   bool
1920   is_searched_file() const
1921   { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; }
1922
1923   const char*
1924   extra_search_path() const
1925   {
1926     return (this->extra_search_path_.empty()
1927             ? NULL
1928             : this->extra_search_path_.c_str());
1929   }
1930
1931   // Return whether we should only read symbols from this file.
1932   bool
1933   just_symbols() const
1934   { return this->just_symbols_; }
1935
1936   // Return whether this file may require a search using the -L
1937   // options.
1938   bool
1939   may_need_search() const
1940   {
1941     return (this->is_lib()
1942             || this->is_searched_file()
1943             || !this->extra_search_path_.empty());
1944   }
1945
1946   // Set the serial number for this argument.
1947   void
1948   set_arg_serial(unsigned int arg_serial)
1949   { this->arg_serial_ = arg_serial; }
1950
1951   // Get the serial number.
1952   unsigned int
1953   arg_serial() const
1954   { return this->arg_serial_; }
1955
1956  private:
1957   // We use std::string, not const char*, here for convenience when
1958   // using script files, so that we do not have to preserve the string
1959   // in that case.
1960   std::string name_;
1961   Input_file_type type_;
1962   std::string extra_search_path_;
1963   bool just_symbols_;
1964   Position_dependent_options options_;
1965   // A unique index for this file argument in the argument list.
1966   unsigned int arg_serial_;
1967 };
1968
1969 // A file or library, or a group, from the command line.
1970
1971 class Input_argument
1972 {
1973  public:
1974   // Create a file or library argument.
1975   explicit Input_argument(Input_file_argument file)
1976     : is_file_(true), file_(file), group_(NULL), lib_(NULL), script_info_(NULL)
1977   { }
1978
1979   // Create a group argument.
1980   explicit Input_argument(Input_file_group* group)
1981     : is_file_(false), group_(group), lib_(NULL), script_info_(NULL)
1982   { }
1983
1984   // Create a lib argument.
1985   explicit Input_argument(Input_file_lib* lib)
1986     : is_file_(false), group_(NULL), lib_(lib), script_info_(NULL)
1987   { }
1988
1989   // Return whether this is a file.
1990   bool
1991   is_file() const
1992   { return this->is_file_; }
1993
1994   // Return whether this is a group.
1995   bool
1996   is_group() const
1997   { return !this->is_file_ && this->lib_ == NULL; }
1998
1999   // Return whether this is a lib.
2000   bool
2001   is_lib() const
2002   { return this->lib_ != NULL; }
2003
2004   // Return the information about the file.
2005   const Input_file_argument&
2006   file() const
2007   {
2008     gold_assert(this->is_file_);
2009     return this->file_;
2010   }
2011
2012   // Return the information about the group.
2013   const Input_file_group*
2014   group() const
2015   {
2016     gold_assert(!this->is_file_);
2017     return this->group_;
2018   }
2019
2020   Input_file_group*
2021   group()
2022   {
2023     gold_assert(!this->is_file_);
2024     return this->group_;
2025   }
2026
2027   // Return the information about the lib.
2028   const Input_file_lib*
2029   lib() const
2030   {
2031     gold_assert(!this->is_file_);
2032     gold_assert(this->lib_);
2033     return this->lib_;
2034   }
2035
2036   Input_file_lib*
2037   lib()
2038   {
2039     gold_assert(!this->is_file_);
2040     gold_assert(this->lib_);
2041     return this->lib_;
2042   }
2043
2044   // If a script generated this argument, store a pointer to the script info.
2045   // Currently used only for recording incremental link information.
2046   void
2047   set_script_info(Script_info* info)
2048   { this->script_info_ = info; }
2049
2050   Script_info*
2051   script_info() const
2052   { return this->script_info_; }
2053
2054  private:
2055   bool is_file_;
2056   Input_file_argument file_;
2057   Input_file_group* group_;
2058   Input_file_lib* lib_;
2059   Script_info* script_info_;
2060 };
2061
2062 typedef std::vector<Input_argument> Input_argument_list;
2063
2064 // A group from the command line.  This is a set of arguments within
2065 // --start-group ... --end-group.
2066
2067 class Input_file_group
2068 {
2069  public:
2070   typedef Input_argument_list::const_iterator const_iterator;
2071
2072   Input_file_group()
2073     : files_()
2074   { }
2075
2076   // Add a file to the end of the group.
2077   Input_argument&
2078   add_file(const Input_file_argument& arg)
2079   {
2080     this->files_.push_back(Input_argument(arg));
2081     return this->files_.back();
2082   }
2083
2084   // Iterators to iterate over the group contents.
2085
2086   const_iterator
2087   begin() const
2088   { return this->files_.begin(); }
2089
2090   const_iterator
2091   end() const
2092   { return this->files_.end(); }
2093
2094  private:
2095   Input_argument_list files_;
2096 };
2097
2098 // A lib from the command line.  This is a set of arguments within
2099 // --start-lib ... --end-lib.
2100
2101 class Input_file_lib
2102 {
2103  public:
2104   typedef Input_argument_list::const_iterator const_iterator;
2105
2106   Input_file_lib(const Position_dependent_options& options)
2107     : files_(), options_(options)
2108   { }
2109
2110   // Add a file to the end of the lib.
2111   Input_argument&
2112   add_file(const Input_file_argument& arg)
2113   {
2114     this->files_.push_back(Input_argument(arg));
2115     return this->files_.back();
2116   }
2117
2118   const Position_dependent_options&
2119   options() const
2120   { return this->options_; }
2121
2122   // Iterators to iterate over the lib contents.
2123
2124   const_iterator
2125   begin() const
2126   { return this->files_.begin(); }
2127
2128   const_iterator
2129   end() const
2130   { return this->files_.end(); }
2131
2132   size_t
2133   size() const
2134   { return this->files_.size(); }
2135
2136  private:
2137   Input_argument_list files_;
2138   Position_dependent_options options_;
2139 };
2140
2141 // A list of files from the command line or a script.
2142
2143 class Input_arguments
2144 {
2145  public:
2146   typedef Input_argument_list::const_iterator const_iterator;
2147
2148   Input_arguments()
2149     : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0)
2150   { }
2151
2152   // Add a file.
2153   Input_argument&
2154   add_file(Input_file_argument& arg);
2155
2156   // Start a group (the --start-group option).
2157   void
2158   start_group();
2159
2160   // End a group (the --end-group option).
2161   void
2162   end_group();
2163
2164   // Start a lib (the --start-lib option).
2165   void
2166   start_lib(const Position_dependent_options&);
2167
2168   // End a lib (the --end-lib option).
2169   void
2170   end_lib();
2171
2172   // Return whether we are currently in a group.
2173   bool
2174   in_group() const
2175   { return this->in_group_; }
2176
2177   // Return whether we are currently in a lib.
2178   bool
2179   in_lib() const
2180   { return this->in_lib_; }
2181
2182   // The number of entries in the list.
2183   int
2184   size() const
2185   { return this->input_argument_list_.size(); }
2186
2187   // Iterators to iterate over the list of input files.
2188
2189   const_iterator
2190   begin() const
2191   { return this->input_argument_list_.begin(); }
2192
2193   const_iterator
2194   end() const
2195   { return this->input_argument_list_.end(); }
2196
2197   // Return whether the list is empty.
2198   bool
2199   empty() const
2200   { return this->input_argument_list_.empty(); }
2201
2202   // Return the number of input files.  This may be larger than
2203   // input_argument_list_.size(), because of files that are part
2204   // of groups or libs.
2205   int
2206   number_of_input_files() const
2207   { return this->file_count_; }
2208
2209  private:
2210   Input_argument_list input_argument_list_;
2211   bool in_group_;
2212   bool in_lib_;
2213   unsigned int file_count_;
2214 };
2215
2216
2217 // All the information read from the command line.  These are held in
2218 // three separate structs: one to hold the options (--foo), one to
2219 // hold the filenames listed on the commandline, and one to hold
2220 // linker script information.  This third is not a subset of the other
2221 // two because linker scripts can be specified either as options (via
2222 // -T) or as a file.
2223
2224 class Command_line
2225 {
2226  public:
2227   typedef Input_arguments::const_iterator const_iterator;
2228
2229   Command_line();
2230
2231   // Process the command line options.  This will exit with an
2232   // appropriate error message if an unrecognized option is seen.
2233   void
2234   process(int argc, const char** argv);
2235
2236   // Process one command-line option.  This takes the index of argv to
2237   // process, and returns the index for the next option.  no_more_options
2238   // is set to true if argv[i] is "--".
2239   int
2240   process_one_option(int argc, const char** argv, int i,
2241                      bool* no_more_options);
2242
2243   // Get the general options.
2244   const General_options&
2245   options() const
2246   { return this->options_; }
2247
2248   // Get the position dependent options.
2249   const Position_dependent_options&
2250   position_dependent_options() const
2251   { return this->position_options_; }
2252
2253   // Get the linker-script options.
2254   Script_options&
2255   script_options()
2256   { return this->script_options_; }
2257
2258   // Finalize the version-script options and return them.
2259   const Version_script_info&
2260   version_script();
2261
2262   // Get the input files.
2263   Input_arguments&
2264   inputs()
2265   { return this->inputs_; }
2266
2267   // The number of input files.
2268   int
2269   number_of_input_files() const
2270   { return this->inputs_.number_of_input_files(); }
2271
2272   // Iterators to iterate over the list of input files.
2273
2274   const_iterator
2275   begin() const
2276   { return this->inputs_.begin(); }
2277
2278   const_iterator
2279   end() const
2280   { return this->inputs_.end(); }
2281
2282  private:
2283   Command_line(const Command_line&);
2284   Command_line& operator=(const Command_line&);
2285
2286   // This is a dummy class to provide a constructor that runs before
2287   // the constructor for the General_options.  The Pre_options constructor
2288   // is used as a hook to set the flag enabling the options to register
2289   // themselves.
2290   struct Pre_options {
2291     Pre_options();
2292   };
2293
2294   // This must come before options_!
2295   Pre_options pre_options_;
2296   General_options options_;
2297   Position_dependent_options position_options_;
2298   Script_options script_options_;
2299   Input_arguments inputs_;
2300 };
2301
2302 } // End namespace gold.
2303
2304 #endif // !defined(GOLD_OPTIONS_H)