gold/options.h

   1 // options.h -- handle command line options for gold  -*- C++ -*-
   2
   3 // Copyright (C) 2006-2018 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   options::String_set::size_type                                          \
 477   varname__##_size() const                                                \
 478   { return this->varname__##_.value.size(); }                             \
 479
 480 // When you have a list of possible values (expressed as string)
 481 // After helparg__ should come an initializer list, like
 482 //   {"foo", "bar", "baz"}
 483 #define DEFINE_enum(varname__, dashes__, shortname__, default_value__,   \
 484                     helpstring__, helparg__, ...)                        \
 485   DEFINE_var(varname__, dashes__, shortname__, default_value__,          \
 486              default_value__, helpstring__, helparg__, false,            \
 487              const char*, const char*, parse_choices_##varname__, false) \
 488  private:                                                                \
 489   static void parse_choices_##varname__(const char* option_name,         \
 490                                         const char* arg,                 \
 491                                         const char** retval) {           \
 492     const char* choices[] = __VA_ARGS__;                                 \
 493     options::parse_choices(option_name, arg, retval,                     \
 494                            choices, sizeof(choices) / sizeof(*choices)); \
 495   }
 496
 497 // This is like DEFINE_bool, but VARNAME is the name of a different
 498 // option.  This option becomes an alias for that one.  INVERT is true
 499 // if this option is an inversion of the other one.
 500 #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__,   \
 501                           helpstring__, no_helpstring__, invert__)      \
 502  private:                                                               \
 503   struct Struct_##option__ : public options::Struct_var                 \
 504   {                                                                     \
 505     Struct_##option__()                                                 \
 506       : option(#option__, dashes__, shortname__, "", helpstring__,      \
 507                NULL, false, this,                                       \
 508                General_options::varname__##is_default ^ invert__)       \
 509     { }                                                                 \
 510                                                                         \
 511     void                                                                \
 512     parse_to_value(const char*, const char*,                            \
 513                    Command_line*, General_options* options)             \
 514     {                                                                   \
 515       options->set_##varname__(!invert__);                              \
 516       options->set_user_set_##varname__();                              \
 517     }                                                                   \
 518                                                                         \
 519     options::One_option option;                                         \
 520   };                                                                    \
 521   Struct_##option__ option__##_;                                        \
 522                                                                         \
 523   struct Struct_no_##option__ : public options::Struct_var              \
 524   {                                                                     \
 525     Struct_no_##option__()                                              \
 526       : option((dashes__ == options::DASH_Z                             \
 527                 ? "no" #option__                                        \
 528                 : "no-" #option__),                                     \
 529                dashes__, '\0', "", no_helpstring__,                     \
 530                NULL, false, this,                                       \
 531                !General_options::varname__##is_default ^ invert__)      \
 532     { }                                                                 \
 533                                                                         \
 534     void                                                                \
 535     parse_to_value(const char*, const char*,                            \
 536                    Command_line*, General_options* options)             \
 537     {                                                                   \
 538       options->set_##varname__(invert__);                               \
 539       options->set_user_set_##varname__();                              \
 540     }                                                                   \
 541                                                                         \
 542     options::One_option option;                                         \
 543   };                                                                    \
 544   Struct_no_##option__ no_##option__##_initializer_
 545
 546 // This is like DEFINE_uint64, but VARNAME is the name of a different
 547 // option.  This option becomes an alias for that one.
 548 #define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \
 549                             helpstring__, helparg__)                    \
 550  private:                                                               \
 551   struct Struct_##option__ : public options::Struct_var                 \
 552   {                                                                     \
 553     Struct_##option__()                                                 \
 554       : option(#option__, dashes__, shortname__, "", helpstring__,      \
 555                helparg__, false, this, false)                           \
 556     { }                                                                 \
 557                                                                         \
 558     void                                                                \
 559     parse_to_value(const char* option_name, const char* arg,            \
 560                    Command_line*, General_options* options)             \
 561     {                                                                   \
 562       uint64_t value;                                                   \
 563       options::parse_uint64(option_name, arg, &value);                  \
 564       options->set_##varname__(value);                                  \
 565       options->set_user_set_##varname__();                              \
 566     }                                                                   \
 567                                                                         \
 568     options::One_option option;                                         \
 569   };                                                                    \
 570   Struct_##option__ option__##_;
 571
 572 // This is used for non-standard flags.  It defines no functions; it
 573 // just calls General_options::parse_VARNAME whenever the flag is
 574 // seen.  We declare parse_VARNAME as a static member of
 575 // General_options; you are responsible for defining it there.
 576 // helparg__ should be NULL iff this special-option is a boolean.
 577 #define DEFINE_special(varname__, dashes__, shortname__,                \
 578                        helpstring__, helparg__)                         \
 579  private:                                                               \
 580   void parse_##varname__(const char* option, const char* arg,           \
 581                          Command_line* inputs);                         \
 582   struct Struct_##varname__ : public options::Struct_special            \
 583   {                                                                     \
 584     Struct_##varname__()                                                \
 585       : options::Struct_special(#varname__, dashes__, shortname__,      \
 586                                 &General_options::parse_##varname__,    \
 587                                 helpstring__, helparg__)                \
 588     { }                                                                 \
 589   };                                                                    \
 590   Struct_##varname__ varname__##_initializer_
 591
 592 // An option that takes an optional string argument.  If the option is
 593 // used with no argument, the value will be the default, and
 594 // user_set_via_option will be true.
 595 #define DEFINE_optional_string(varname__, dashes__, shortname__,        \
 596                                default_value__,                         \
 597                                helpstring__, helparg__)                 \
 598   DEFINE_var(varname__, dashes__, shortname__, default_value__,         \
 599              default_value__, helpstring__, helparg__, true,            \
 600              const char*, const char*, options::parse_optional_string,  \
 601              false)
 602
 603 // A directory to search.  For each directory we record whether it is
 604 // in the sysroot.  We need to know this so that, if a linker script
 605 // is found within the sysroot, we will apply the sysroot to any files
 606 // named by that script.
 607
 608 class Search_directory
 609 {
 610  public:
 611   // We need a default constructor because we put this in a
 612   // std::vector.
 613   Search_directory()
 614     : name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
 615   { }
 616
 617   // This is the usual constructor.
 618   Search_directory(const std::string& name, bool put_in_sysroot)
 619     : name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
 620   {
 621     if (this->name_.empty())
 622       this->name_ = ".";
 623   }
 624
 625   // This is called if we have a sysroot.  The sysroot is prefixed to
 626   // any entries for which put_in_sysroot_ is true.  is_in_sysroot_ is
 627   // set to true for any enries which are in the sysroot (this will
 628   // naturally include any entries for which put_in_sysroot_ is true).
 629   // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
 630   // passing SYSROOT to lrealpath.
 631   void
 632   add_sysroot(const char* sysroot, const char* canonical_sysroot);
 633
 634   // Get the directory name.
 635   const std::string&
 636   name() const
 637   { return this->name_; }
 638
 639   // Return whether this directory is in the sysroot.
 640   bool
 641   is_in_sysroot() const
 642   { return this->is_in_sysroot_; }
 643
 644   // Return whether this is considered a system directory.
 645   bool
 646   is_system_directory() const
 647   { return this->put_in_sysroot_ || this->is_in_sysroot_; }
 648
 649  private:
 650   // The directory name.
 651   std::string name_;
 652   // True if the sysroot should be added as a prefix for this
 653   // directory (if there is a sysroot).  This is true for system
 654   // directories that we search by default.
 655   bool put_in_sysroot_;
 656   // True if this directory is in the sysroot (if there is a sysroot).
 657   // This is true if there is a sysroot and either 1) put_in_sysroot_
 658   // is true, or 2) the directory happens to be in the sysroot based
 659   // on a pathname comparison.
 660   bool is_in_sysroot_;
 661 };
 662
 663 class General_options
 664 {
 665  private:
 666   // NOTE: For every option that you add here, also consider if you
 667   // should add it to Position_dependent_options.
 668   DEFINE_special(help, options::TWO_DASHES, '\0',
 669                  N_("Report usage information"), NULL);
 670   DEFINE_special(version, options::TWO_DASHES, 'v',
 671                  N_("Report version information"), NULL);
 672   DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0',
 673                  N_("Report version and target information"), NULL);
 674
 675   // These options are sorted approximately so that for each letter in
 676   // the alphabet, we show the option whose shortname is that letter
 677   // (if any) and then every longname that starts with that letter (in
 678   // alphabetical order).  For both, lowercase sorts before uppercase.
 679   // The -z options come last.
 680
 681   // a
 682
 683   DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false,
 684               N_("Not supported"),
 685               N_("Do not copy DT_NEEDED tags from shared libraries"));
 686
 687   DEFINE_bool_alias(allow_multiple_definition, muldefs, options::TWO_DASHES,
 688                     '\0',
 689                     N_("Allow multiple definitions of symbols"),
 690                     N_("Do not allow multiple definitions"), false);
 691
 692   DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false,
 693               N_("Allow unresolved references in shared libraries"),
 694               N_("Do not allow unresolved references in shared libraries"));
 695
 696   DEFINE_bool(apply_dynamic_relocs, options::TWO_DASHES, '\0', true,
 697               N_("Apply link-time values for dynamic relocations"),
 698               N_("(aarch64 only) Do not apply link-time values "
 699                  "for dynamic relocations"));
 700
 701   DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false,
 702               N_("Use DT_NEEDED only for shared libraries that are used"),
 703               N_("Use DT_NEEDED for all shared libraries"));
 704
 705   DEFINE_enum(assert, options::ONE_DASH, '\0', NULL,
 706               N_("Ignored"), N_("[ignored]"),
 707               {"definitions", "nodefinitions", "nosymbolic", "pure-text"});
 708
 709   // b
 710
 711   // This should really be an "enum", but it's too easy for folks to
 712   // forget to update the list as they add new targets.  So we just
 713   // accept any string.  We'll fail later (when the string is parsed),
 714   // if the target isn't actually supported.
 715   DEFINE_string(format, options::TWO_DASHES, 'b', "elf",
 716                 N_("Set input format"), ("[elf,binary]"));
 717
 718   DEFINE_bool(be8, options::TWO_DASHES, '\0', false,
 719               N_("Output BE8 format image"), NULL);
 720
 721   DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "tree",
 722                          N_("Generate build ID note"),
 723                          N_("[=STYLE]"));
 724
 725   DEFINE_uint64(build_id_chunk_size_for_treehash,
 726                 options::TWO_DASHES, '\0', 2 << 20,
 727                 N_("Chunk size for '--build-id=tree'"), N_("SIZE"));
 728
 729   DEFINE_uint64(build_id_min_file_size_for_treehash, options::TWO_DASHES,
 730                 '\0', 40 << 20,
 731                 N_("Minimum output file size for '--build-id=tree' to work"
 732                    " differently than '--build-id=sha1'"), N_("SIZE"));
 733
 734   DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true,
 735               N_("-l searches for shared libraries"), NULL);
 736   DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0',
 737                     N_("-l does not search for shared libraries"), NULL,
 738                     true);
 739   DEFINE_bool_alias(dy, Bdynamic, options::ONE_DASH, '\0',
 740                     N_("alias for -Bdynamic"), NULL, false);
 741   DEFINE_bool_alias(dn, Bdynamic, options::ONE_DASH, '\0',
 742                     N_("alias for -Bstatic"), NULL, true);
 743
 744   DEFINE_bool(Bgroup, options::ONE_DASH, '\0', false,
 745               N_("Use group name lookup rules for shared library"), NULL);
 746
 747   DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false,
 748               N_("Generate shared library (alias for -G/-shared)"), NULL);
 749
 750   DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false,
 751               N_("Bind defined symbols locally"), NULL);
 752
 753   DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false,
 754               N_("Bind defined function symbols locally"), NULL);
 755
 756   // c
 757
 758   DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true,
 759               N_("Check segment addresses for overlaps"),
 760               N_("Do not check segment addresses for overlaps"));
 761
 762   DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none",
 763               N_("Compress .debug_* sections in the output file"),
 764               ("[none,zlib,zlib-gnu,zlib-gabi]"),
 765               {"none", "zlib", "zlib-gnu", "zlib-gabi"});
 766
 767   DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false,
 768               N_("Not supported"),
 769               N_("Do not copy DT_NEEDED tags from shared libraries"));
 770
 771   DEFINE_bool(cref, options::TWO_DASHES, '\0', false,
 772               N_("Output cross reference table"),
 773               N_("Do not output cross reference table"));
 774
 775   DEFINE_bool(ctors_in_init_array, options::TWO_DASHES, '\0', true,
 776               N_("Use DT_INIT_ARRAY for all constructors"),
 777               N_("Handle constructors as directed by compiler"));
 778
 779   // d
 780
 781   DEFINE_bool(define_common, options::TWO_DASHES, 'd', false,
 782               N_("Define common symbols"),
 783               N_("Do not define common symbols in relocatable output"));
 784   DEFINE_bool(dc, options::ONE_DASH, '\0', false,
 785               N_("Alias for -d"), NULL);
 786   DEFINE_bool(dp, options::ONE_DASH, '\0', false,
 787               N_("Alias for -d"), NULL);
 788
 789   DEFINE_string(debug, options::TWO_DASHES, '\0', "",
 790                 N_("Turn on debugging"),
 791                 N_("[all,files,script,task][,...]"));
 792
 793   DEFINE_special(defsym, options::TWO_DASHES, '\0',
 794                  N_("Define a symbol"), N_("SYMBOL=EXPRESSION"));
 795
 796   DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL,
 797                          N_("Demangle C++ symbols in log messages"),
 798                          N_("[=STYLE]"));
 799   DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false,
 800               N_("Do not demangle C++ symbols in log messages"),
 801               NULL);
 802
 803   DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false,
 804               N_("Look for violations of the C++ One Definition Rule"),
 805               N_("Do not look for violations of the C++ One Definition Rule"));
 806
 807   DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false,
 808               N_("Add data symbols to dynamic symbols"), NULL);
 809
 810   DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false,
 811               N_("Add C++ operator new/delete to dynamic symbols"), NULL);
 812
 813   DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false,
 814               N_("Add C++ typeinfo to dynamic symbols"), NULL);
 815
 816   DEFINE_special(dynamic_list, options::TWO_DASHES, '\0',
 817                  N_("Read a list of dynamic symbols"), N_("FILE"));
 818
 819   // e
 820
 821   DEFINE_bool(emit_stub_syms, options::TWO_DASHES, '\0', true,
 822               N_("(PowerPC only) Label linker stubs with a symbol"),
 823               N_("(PowerPC only) Do not label linker stubs with a symbol"));
 824
 825   DEFINE_string(entry, options::TWO_DASHES, 'e', NULL,
 826                 N_("Set program start address"), N_("ADDRESS"));
 827
 828   DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false,
 829               N_("Create exception frame header"),
 830               N_("Do not create exception frame header"));
 831
 832   // Alphabetized under 'e' because the option is spelled --enable-new-dtags.
 833   DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true,
 834                 N_("Enable use of DT_RUNPATH"),
 835                 N_("Disable use of DT_RUNPATH"));
 836
 837   DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL,
 838               N_("(ARM only) Do not warn about objects with incompatible "
 839                  "enum sizes"));
 840
 841   DEFINE_special(exclude_libs, options::TWO_DASHES, '\0',
 842                  N_("Exclude libraries from automatic export"),
 843                  N_(("lib,lib ...")));
 844
 845   DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false,
 846               N_("Export all dynamic symbols"),
 847               N_("Do not export all dynamic symbols"));
 848
 849   DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0',
 850              N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL"));
 851
 852   DEFINE_special(EB, options::ONE_DASH, '\0',
 853                  N_("Link big-endian objects."), NULL);
 854   DEFINE_special(EL, options::ONE_DASH, '\0',
 855                  N_("Link little-endian objects."), NULL);
 856
 857   // f
 858
 859   DEFINE_set(auxiliary, options::TWO_DASHES, 'f',
 860              N_("Auxiliary filter for shared object symbol table"),
 861              N_("SHLIB"));
 862
 863   DEFINE_string(filter, options::TWO_DASHES, 'F', NULL,
 864                 N_("Filter for shared object symbol table"),
 865                 N_("SHLIB"));
 866
 867   DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false,
 868               N_("Treat warnings as errors"),
 869               N_("Do not treat warnings as errors"));
 870
 871   DEFINE_string(fini, options::ONE_DASH, '\0', "_fini",
 872                 N_("Call SYMBOL at unload-time"), N_("SYMBOL"));
 873
 874   DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true,
 875               N_("(ARM only) Fix binaries for ARM1176 erratum"),
 876               N_("(ARM only) Do not fix binaries for ARM1176 erratum"));
 877
 878   DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false,
 879               N_("(ARM only) Fix binaries for Cortex-A8 erratum"),
 880               N_("(ARM only) Do not fix binaries for Cortex-A8 erratum"));
 881
 882   DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false,
 883               N_("(AArch64 only) Fix Cortex-A53 erratum 843419"),
 884               N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419"));
 885
 886   DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false,
 887               N_("(AArch64 only) Fix Cortex-A53 erratum 835769"),
 888               N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769"));
 889
 890   DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0',
 891                  N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"),
 892                  NULL);
 893
 894   DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0',
 895                  N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking "
 896                     "veneer"),
 897                  NULL);
 898
 899   DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "",
 900                 N_("Ignored for GCC linker option compatibility"),
 901                 N_("[gold,bfd]"));
 902
 903   // g
 904
 905   DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false,
 906               N_("Ignored"), NULL);
 907
 908   DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false,
 909               N_("Remove unused sections"),
 910               N_("Don't remove unused sections"));
 911
 912   DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false,
 913               N_("Generate .gdb_index section"),
 914               N_("Do not generate .gdb_index section"));
 915
 916   DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true,
 917               N_("Enable STB_GNU_UNIQUE symbol binding"),
 918               N_("Disable STB_GNU_UNIQUE symbol binding"));
 919
 920   DEFINE_bool(shared, options::ONE_DASH, 'G', false,
 921               N_("Generate shared library"), NULL);
 922
 923   // h
 924
 925   DEFINE_string(soname, options::ONE_DASH, 'h', NULL,
 926                 N_("Set shared library name"), N_("FILENAME"));
 927
 928   DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0,
 929                 N_("Min fraction of empty buckets in dynamic hash"),
 930                 N_("FRACTION"));
 931
 932   DEFINE_enum(hash_style, options::TWO_DASHES, '\0', DEFAULT_HASH_STYLE,
 933               N_("Dynamic hash style"), N_("[sysv,gnu,both]"),
 934               {"sysv", "gnu", "both"});
 935
 936   // i
 937
 938   DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0',
 939                     N_("Alias for -r"), NULL, false);
 940
 941   DEFINE_enum(icf, options::TWO_DASHES, '\0', "none",
 942               N_("Identical Code Folding. "
 943                  "\'--icf=safe\' Folds ctors, dtors and functions whose"
 944                  " pointers are definitely not taken"),
 945               ("[none,all,safe]"),
 946               {"none", "all", "safe"});
 947
 948   DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0,
 949               N_("Number of iterations of ICF (default 2)"), N_("COUNT"));
 950
 951   DEFINE_special(incremental, options::TWO_DASHES, '\0',
 952                  N_("Do an incremental link if possible; "
 953                     "otherwise, do a full link and prepare output "
 954                     "for incremental linking"), NULL);
 955
 956   DEFINE_special(no_incremental, options::TWO_DASHES, '\0',
 957                  N_("Do a full link (default)"), NULL);
 958
 959   DEFINE_special(incremental_full, options::TWO_DASHES, '\0',
 960                  N_("Do a full link and "
 961                     "prepare output for incremental linking"), NULL);
 962
 963   DEFINE_special(incremental_update, options::TWO_DASHES, '\0',
 964                  N_("Do an incremental link; exit if not possible"), NULL);
 965
 966   DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL,
 967                 N_("Set base file for incremental linking"
 968                    " (default is output file)"),
 969                 N_("FILE"));
 970
 971   DEFINE_special(incremental_changed, options::TWO_DASHES, '\0',
 972                  N_("Assume files changed"), NULL);
 973
 974   DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0',
 975                  N_("Assume files didn't change"), NULL);
 976
 977   DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0',
 978                  N_("Use timestamps to check files (default)"), NULL);
 979
 980   DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0',
 981                  N_("Assume startup files unchanged "
 982                     "(files preceding this option)"), NULL);
 983
 984   DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10,
 985                  N_("Amount of extra space to allocate for patches "
 986                     "(default 10)"),
 987                  N_("PERCENT"));
 988
 989   DEFINE_string(init, options::ONE_DASH, '\0', "_init",
 990                 N_("Call SYMBOL at load-time"), N_("SYMBOL"));
 991
 992   DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL,
 993                 N_("Set dynamic linker path"), N_("PROGRAM"));
 994
 995   // j
 996
 997   DEFINE_special(just_symbols, options::TWO_DASHES, '\0',
 998                  N_("Read only symbol values from FILE"), N_("FILE"));
 999
1000   // k
1001
1002   DEFINE_bool(keep_files_mapped, options::TWO_DASHES, '\0', true,
1003               N_("Keep files mapped across passes"),
1004               N_("Release mapped files after each pass"));
1005
1006   DEFINE_set(keep_unique, options::TWO_DASHES, '\0',
1007              N_("Do not fold this symbol during ICF"), N_("SYMBOL"));
1008
1009   // l
1010
1011   DEFINE_special(library, options::TWO_DASHES, 'l',
1012                  N_("Search for library LIBNAME"), N_("LIBNAME"));
1013
1014   DEFINE_bool(ld_generated_unwind_info, options::TWO_DASHES, '\0', true,
1015               N_("Generate unwind information for PLT"),
1016               N_("Do not generate unwind information for PLT"));
1017
1018   DEFINE_dirlist(library_path, options::TWO_DASHES, 'L',
1019                  N_("Add directory to search path"), N_("DIR"));
1020
1021   DEFINE_bool(long_plt, options::TWO_DASHES, '\0', false,
1022               N_("(ARM only) Generate long PLT entries"),
1023               N_("(ARM only) Do not generate long PLT entries"));
1024
1025   // m
1026
1027   DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "",
1028                 N_("Set GNU linker emulation; obsolete"), N_("EMULATION"));
1029
1030   DEFINE_bool(map_whole_files, options::TWO_DASHES, '\0',
1031               sizeof(void*) >= 8,
1032               N_("Map whole files to memory"),
1033               N_("Map relevant file parts to memory"));
1034
1035   DEFINE_bool(merge_exidx_entries, options::TWO_DASHES, '\0', true,
1036               N_("(ARM only) Merge exidx entries in debuginfo"),
1037               N_("(ARM only) Do not merge exidx entries in debuginfo"));
1038
1039   DEFINE_bool(mmap_output_file, options::TWO_DASHES, '\0', true,
1040               N_("Map the output file for writing"),
1041               N_("Do not map the output file for writing"));
1042
1043   DEFINE_bool(print_map, options::TWO_DASHES, 'M', false,
1044               N_("Write map file on standard output"), NULL);
1045
1046   DEFINE_string(Map, options::ONE_DASH, '\0', NULL, N_("Write map file"),
1047                 N_("MAPFILENAME"));
1048
1049   // n
1050
1051   DEFINE_bool(nmagic, options::TWO_DASHES, 'n', false,
1052               N_("Do not page align data"), NULL);
1053   DEFINE_bool(omagic, options::EXACTLY_TWO_DASHES, 'N', false,
1054               N_("Do not page align data, do not make text readonly"),
1055               N_("Page align data, make text readonly"));
1056
1057   DEFINE_bool(no_keep_memory, options::TWO_DASHES, '\0', false,
1058               N_("Use less memory and more disk I/O "
1059                  "(included only for compatibility with GNU ld)"), NULL);
1060
1061   DEFINE_bool_alias(no_undefined, defs, options::TWO_DASHES, '\0',
1062                     N_("Report undefined symbols (even with --shared)"),
1063                     NULL, false);
1064
1065   DEFINE_bool(noinhibit_exec, options::TWO_DASHES, '\0', false,
1066               N_("Create an output file even if errors occur"), NULL);
1067
1068   DEFINE_bool(nostdlib, options::ONE_DASH, '\0', false,
1069               N_("Only search directories specified on the command line"),
1070               NULL);
1071
1072   // o
1073
1074   DEFINE_string(output, options::TWO_DASHES, 'o', "a.out",
1075                 N_("Set output file name"), N_("FILE"));
1076
1077   DEFINE_string(oformat, options::EXACTLY_TWO_DASHES, '\0', "elf",
1078                 N_("Set output format"), N_("[binary]"));
1079
1080   DEFINE_uint(optimize, options::EXACTLY_ONE_DASH, 'O', 0,
1081               N_("Optimize output file size"), N_("LEVEL"));
1082
1083   DEFINE_enum(orphan_handling, options::TWO_DASHES, '\0', "place",
1084               N_("Orphan section handling"), N_("[place,discard,warn,error]"),
1085               {"place", "discard", "warn", "error"});
1086
1087   // p
1088
1089   DEFINE_bool(p, options::ONE_DASH, 'p', false,
1090               N_("Ignored for ARM compatibility"), NULL);
1091
1092   DEFINE_bool(pie, options::ONE_DASH, '\0', false,
1093               N_("Create a position independent executable"),
1094               N_("Do not create a position independent executable"));
1095   DEFINE_bool_alias(pic_executable, pie, options::TWO_DASHES, '\0',
1096                     N_("Create a position independent executable"),
1097                     N_("Do not create a position independent executable"),
1098                     false);
1099
1100   DEFINE_bool(pic_veneer, options::TWO_DASHES, '\0', false,
1101               N_("Force PIC sequences for ARM/Thumb interworking veneers"),
1102               NULL);
1103
1104   DEFINE_bool(pipeline_knowledge, options::ONE_DASH, '\0', false,
1105               NULL, N_("(ARM only) Ignore for backward compatibility"));
1106
1107   DEFINE_var(plt_align, options::TWO_DASHES, '\0', 0, "5",
1108              N_("(PowerPC only) Align PLT call stubs to fit cache lines"),
1109              N_("[=P2ALIGN]"), true, int, int, options::parse_uint, false);
1110
1111   DEFINE_bool(plt_localentry, options::TWO_DASHES, '\0', false,
1112               N_("(PowerPC64 only) Optimize calls to ELFv2 localentry:0 functions"),
1113               N_("(PowerPC64 only) Don't optimize ELFv2 calls"));
1114
1115   DEFINE_bool(plt_static_chain, options::TWO_DASHES, '\0', false,
1116               N_("(PowerPC64 only) PLT call stubs should load r11"),
1117               N_("(PowerPC64 only) PLT call stubs should not load r11"));
1118
1119   DEFINE_bool(plt_thread_safe, options::TWO_DASHES, '\0', false,
1120               N_("(PowerPC64 only) PLT call stubs with load-load barrier"),
1121               N_("(PowerPC64 only) PLT call stubs without barrier"));
1122
1123 #ifdef ENABLE_PLUGINS
1124   DEFINE_special(plugin, options::TWO_DASHES, '\0',
1125                  N_("Load a plugin library"), N_("PLUGIN"));
1126   DEFINE_special(plugin_opt, options::TWO_DASHES, '\0',
1127                  N_("Pass an option to the plugin"), N_("OPTION"));
1128 #else
1129   DEFINE_special(plugin, options::TWO_DASHES, '\0',
1130                  N_("Load a plugin library (not supported)"), N_("PLUGIN"));
1131   DEFINE_special(plugin_opt, options::TWO_DASHES, '\0',
1132                  N_("Pass an option to the plugin (not supported)"),
1133                  N_("OPTION"));
1134 #endif
1135
1136   DEFINE_bool(posix_fallocate, options::TWO_DASHES, '\0', true,
1137               N_("Use posix_fallocate to reserve space in the output file"),
1138               N_("Use fallocate or ftruncate to reserve space"));
1139
1140   DEFINE_bool(preread_archive_symbols, options::TWO_DASHES, '\0', false,
1141               N_("Preread archive symbols when multi-threaded"), NULL);
1142
1143   DEFINE_bool(print_gc_sections, options::TWO_DASHES, '\0', false,
1144               N_("List removed unused sections on stderr"),
1145               N_("Do not list removed unused sections"));
1146
1147   DEFINE_bool(print_icf_sections, options::TWO_DASHES, '\0', false,
1148               N_("List folded identical sections on stderr"),
1149               N_("Do not list folded identical sections"));
1150
1151   DEFINE_bool(print_output_format, options::TWO_DASHES, '\0', false,
1152               N_("Print default output format"), NULL);
1153
1154   DEFINE_string(print_symbol_counts, options::TWO_DASHES, '\0', NULL,
1155                 N_("Print symbols defined and used for each input"),
1156                 N_("FILENAME"));
1157
1158   DEFINE_special(push_state, options::TWO_DASHES, '\0',
1159                  N_("Save the state of flags related to input files"), NULL);
1160   DEFINE_special(pop_state, options::TWO_DASHES, '\0',
1161                  N_("Restore the state of flags related to input files"), NULL);
1162
1163   // q
1164
1165   DEFINE_bool(emit_relocs, options::TWO_DASHES, 'q', false,
1166               N_("Generate relocations in output"), NULL);
1167
1168   DEFINE_bool(Qy, options::EXACTLY_ONE_DASH, '\0', false,
1169               N_("Ignored for SVR4 compatibility"), NULL);
1170
1171   // r
1172
1173   DEFINE_bool(relocatable, options::EXACTLY_ONE_DASH, 'r', false,
1174               N_("Generate relocatable output"), NULL);
1175
1176   DEFINE_bool(relax, options::TWO_DASHES, '\0', false,
1177               N_("Relax branches on certain targets"),
1178               N_("Do not relax branches"));
1179
1180   DEFINE_string(retain_symbols_file, options::TWO_DASHES, '\0', NULL,
1181                 N_("keep only symbols listed in this file"), N_("FILE"));
1182
1183   DEFINE_bool(rosegment, options::TWO_DASHES, '\0', false,
1184               N_("Put read-only non-executable sections in their own segment"),
1185               NULL);
1186
1187   DEFINE_uint64(rosegment_gap, options::TWO_DASHES, '\0', -1U,
1188                 N_("Set offset between executable and read-only segments"),
1189                 N_("OFFSET"));
1190
1191   // -R really means -rpath, but can mean --just-symbols for
1192   // compatibility with GNU ld.  -rpath is always -rpath, so we list
1193   // it separately.
1194   DEFINE_special(R, options::EXACTLY_ONE_DASH, 'R',
1195                  N_("Add DIR to runtime search path"), N_("DIR"));
1196
1197   DEFINE_dirlist(rpath, options::ONE_DASH, '\0',
1198                  N_("Add DIR to runtime search path"), N_("DIR"));
1199
1200   DEFINE_dirlist(rpath_link, options::TWO_DASHES, '\0',
1201                  N_("Add DIR to link time shared library search path"),
1202                  N_("DIR"));
1203
1204   // s
1205
1206   DEFINE_bool(strip_all, options::TWO_DASHES, 's', false,
1207               N_("Strip all symbols"), NULL);
1208   DEFINE_bool(strip_debug, options::TWO_DASHES, 'S', false,
1209               N_("Strip debugging information"), NULL);
1210   DEFINE_bool(strip_debug_non_line, options::TWO_DASHES, '\0', false,
1211               N_("Emit only debug line number information"), NULL);
1212   DEFINE_bool(strip_debug_gdb, options::TWO_DASHES, '\0', false,
1213               N_("Strip debug symbols that are unused by gdb "
1214                  "(at least versions <= 7.4)"), NULL);
1215   DEFINE_bool(strip_lto_sections, options::TWO_DASHES, '\0', true,
1216               N_("Strip LTO intermediate code sections"), NULL);
1217
1218   DEFINE_string(section_ordering_file, options::TWO_DASHES, '\0', NULL,
1219                 N_("Layout sections in the order specified"),
1220                 N_("FILENAME"));
1221
1222   DEFINE_special(section_start, options::TWO_DASHES, '\0',
1223                  N_("Set address of section"), N_("SECTION=ADDRESS"));
1224
1225   DEFINE_bool(secure_plt, options::TWO_DASHES , '\0', true,
1226               N_("(PowerPC only) Use new-style PLT"), NULL);
1227
1228   DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL,
1229                          N_("Sort common symbols by alignment"),
1230                          N_("[={ascending,descending}]"));
1231
1232   DEFINE_enum(sort_section, options::TWO_DASHES, '\0', "none",
1233               N_("Sort sections by name.  \'--no-text-reorder\'"
1234                  " will override \'--sort-section=name\' for .text"),
1235               N_("[none,name]"),
1236               {"none", "name"});
1237
1238   DEFINE_uint(spare_dynamic_tags, options::TWO_DASHES, '\0', 5,
1239               N_("Dynamic tag slots to reserve (default 5)"),
1240               N_("COUNT"));
1241
1242   DEFINE_int(stub_group_size, options::TWO_DASHES , '\0', 1,
1243              N_("(ARM, PowerPC only) The maximum distance from instructions "
1244                 "in a group of sections to their stubs. Negative values mean "
1245                 "stubs are always after the group. 1 means use default size"),
1246              N_("SIZE"));
1247
1248   DEFINE_bool(stub_group_multi, options::TWO_DASHES, '\0', true,
1249               N_("(PowerPC only) Allow a group of stubs to serve multiple "
1250                  "output sections"),
1251               N_("(PowerPC only) Each output section has its own stubs"));
1252
1253   DEFINE_uint(split_stack_adjust_size, options::TWO_DASHES, '\0', 0x4000,
1254               N_("Stack size when -fsplit-stack function calls non-split"),
1255               N_("SIZE"));
1256
1257   // This is not actually special in any way, but I need to give it
1258   // a non-standard accessor-function name because 'static' is a keyword.
1259   DEFINE_special(static, options::ONE_DASH, '\0',
1260                  N_("Do not link against shared libraries"), NULL);
1261
1262   DEFINE_special(start_lib, options::TWO_DASHES, '\0',
1263                  N_("Start a library"), NULL);
1264   DEFINE_special(end_lib, options::TWO_DASHES, '\0',
1265                  N_("End a library "), NULL);
1266
1267   DEFINE_bool(stats, options::TWO_DASHES, '\0', false,
1268               N_("Print resource usage statistics"), NULL);
1269
1270   DEFINE_string(sysroot, options::TWO_DASHES, '\0', "",
1271                 N_("Set target system root directory"), N_("DIR"));
1272
1273   // t
1274
1275   DEFINE_bool(trace, options::TWO_DASHES, 't', false,
1276               N_("Print the name of each input file"), NULL);
1277
1278   DEFINE_bool(target1_abs, options::TWO_DASHES, '\0', false,
1279               N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_ABS32"),
1280               NULL);
1281   DEFINE_bool(target1_rel, options::TWO_DASHES, '\0', false,
1282               N_("(ARM only) Force R_ARM_TARGET1 type to R_ARM_REL32"),
1283               NULL);
1284   DEFINE_enum(target2, options::TWO_DASHES, '\0', NULL,
1285               N_("(ARM only) Set R_ARM_TARGET2 relocation type"),
1286               N_("[rel, abs, got-rel"),
1287               {"rel", "abs", "got-rel"});
1288
1289   DEFINE_bool(text_reorder, options::TWO_DASHES, '\0', true,
1290               N_("Enable text section reordering for GCC section names"),
1291               N_("Disable text section reordering for GCC section names"));
1292
1293   DEFINE_bool(threads, options::TWO_DASHES, '\0', false,
1294               N_("Run the linker multi-threaded"),
1295               N_("Do not run the linker multi-threaded"));
1296   DEFINE_uint(thread_count, options::TWO_DASHES, '\0', 0,
1297               N_("Number of threads to use"), N_("COUNT"));
1298   DEFINE_uint(thread_count_initial, options::TWO_DASHES, '\0', 0,
1299               N_("Number of threads to use in initial pass"), N_("COUNT"));
1300   DEFINE_uint(thread_count_middle, options::TWO_DASHES, '\0', 0,
1301               N_("Number of threads to use in middle pass"), N_("COUNT"));
1302   DEFINE_uint(thread_count_final, options::TWO_DASHES, '\0', 0,
1303               N_("Number of threads to use in final pass"), N_("COUNT"));
1304
1305   DEFINE_bool(tls_optimize, options::TWO_DASHES, '\0', true,
1306               N_("(PowerPC/64 only) Optimize GD/LD/IE code to IE/LE"),
1307               N_("(PowerPC/64 only) Don'\''t try to optimize TLS accesses"));
1308   DEFINE_bool(tls_get_addr_optimize, options::TWO_DASHES, '\0', true,
1309               N_("(PowerPC/64 only) Use a special __tls_get_addr call"),
1310               N_("(PowerPC/64 only) Don't use a special __tls_get_addr call"));
1311
1312   DEFINE_bool(toc_optimize, options::TWO_DASHES, '\0', true,
1313               N_("(PowerPC64 only) Optimize TOC code sequences"),
1314               N_("(PowerPC64 only) Don't optimize TOC code sequences"));
1315
1316   DEFINE_bool(toc_sort, options::TWO_DASHES, '\0', true,
1317               N_("(PowerPC64 only) Sort TOC and GOT sections"),
1318               N_("(PowerPC64 only) Don't sort TOC and GOT sections"));
1319
1320   DEFINE_special(script, options::TWO_DASHES, 'T',
1321                  N_("Read linker script"), N_("FILE"));
1322
1323   DEFINE_uint64(Tbss, options::ONE_DASH, '\0', -1U,
1324                 N_("Set the address of the bss segment"), N_("ADDRESS"));
1325   DEFINE_uint64(Tdata, options::ONE_DASH, '\0', -1U,
1326                 N_("Set the address of the data segment"), N_("ADDRESS"));
1327   DEFINE_uint64(Ttext, options::ONE_DASH, '\0', -1U,
1328                 N_("Set the address of the text segment"), N_("ADDRESS"));
1329   DEFINE_uint64_alias(Ttext_segment, Ttext, options::ONE_DASH, '\0',
1330                       N_("Set the address of the text segment"),
1331                       N_("ADDRESS"));
1332   DEFINE_uint64(Trodata_segment, options::ONE_DASH, '\0', -1U,
1333                 N_("Set the address of the rodata segment"), N_("ADDRESS"));
1334
1335   // u
1336
1337   DEFINE_set(undefined, options::TWO_DASHES, 'u',
1338              N_("Create undefined reference to SYMBOL"), N_("SYMBOL"));
1339
1340   DEFINE_enum(unresolved_symbols, options::TWO_DASHES, '\0', NULL,
1341               N_("How to handle unresolved symbols"),
1342               ("ignore-all,report-all,ignore-in-object-files,"
1343                "ignore-in-shared-libs"),
1344               {"ignore-all", "report-all", "ignore-in-object-files",
1345                   "ignore-in-shared-libs"});
1346
1347   // v
1348
1349   DEFINE_bool(verbose, options::TWO_DASHES, '\0', false,
1350               N_("Alias for --debug=files"), NULL);
1351
1352   DEFINE_special(version_script, options::TWO_DASHES, '\0',
1353                  N_("Read version script"), N_("FILE"));
1354
1355   // w
1356
1357   DEFINE_bool(warn_common, options::TWO_DASHES, '\0', false,
1358               N_("Warn about duplicate common symbols"),
1359               N_("Do not warn about duplicate common symbols"));
1360
1361   DEFINE_bool_ignore(warn_constructors, options::TWO_DASHES, '\0',
1362                      N_("Ignored"), N_("Ignored"));
1363
1364   DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false,
1365               N_("Warn if the stack is executable"),
1366               N_("Do not warn if the stack is executable"));
1367
1368   DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true,
1369               NULL, N_("Don't warn about mismatched input files"));
1370
1371   DEFINE_bool(warn_multiple_gp, options::TWO_DASHES, '\0', false,
1372               N_("Ignored"), NULL);
1373
1374   DEFINE_bool(warn_search_mismatch, options::TWO_DASHES, '\0', true,
1375               N_("Warn when skipping an incompatible library"),
1376               N_("Don't warn when skipping an incompatible library"));
1377
1378   DEFINE_bool(warn_shared_textrel, options::TWO_DASHES, '\0', false,
1379               N_("Warn if text segment is not shareable"),
1380               N_("Do not warn if text segment is not shareable"));
1381
1382   DEFINE_bool(warn_unresolved_symbols, options::TWO_DASHES, '\0', false,
1383               N_("Report unresolved symbols as warnings"),
1384               NULL);
1385   DEFINE_bool_alias(error_unresolved_symbols, warn_unresolved_symbols,
1386                     options::TWO_DASHES, '\0',
1387                     N_("Report unresolved symbols as errors"),
1388                     NULL, true);
1389
1390   DEFINE_bool(wchar_size_warning, options::TWO_DASHES, '\0', true, NULL,
1391               N_("(ARM only) Do not warn about objects with incompatible "
1392                  "wchar_t sizes"));
1393
1394   DEFINE_bool(weak_unresolved_symbols, options::TWO_DASHES, '\0', false,
1395               N_("Convert unresolved symbols to weak references"),
1396               NULL);
1397
1398   DEFINE_bool(whole_archive, options::TWO_DASHES, '\0', false,
1399               N_("Include all archive contents"),
1400               N_("Include only needed archive contents"));
1401
1402   DEFINE_set(wrap, options::TWO_DASHES, '\0',
1403              N_("Use wrapper functions for SYMBOL"), N_("SYMBOL"));
1404
1405   // x
1406
1407   DEFINE_special(discard_all, options::TWO_DASHES, 'x',
1408                  N_("Delete all local symbols"), NULL);
1409   DEFINE_special(discard_locals, options::TWO_DASHES, 'X',
1410                  N_("Delete all temporary local symbols"), NULL);
1411   DEFINE_special(discard_none, options::TWO_DASHES, '\0',
1412                  N_("Keep all local symbols"), NULL);
1413
1414   // y
1415
1416   DEFINE_set(trace_symbol, options::TWO_DASHES, 'y',
1417              N_("Trace references to symbol"), N_("SYMBOL"));
1418
1419   DEFINE_bool(undefined_version, options::TWO_DASHES, '\0', true,
1420               N_("Allow unused version in script"),
1421               N_("Do not allow unused version in script"));
1422
1423   DEFINE_string(Y, options::EXACTLY_ONE_DASH, 'Y', "",
1424                 N_("Default search path for Solaris compatibility"),
1425                 N_("PATH"));
1426
1427   // special characters
1428
1429   DEFINE_special(start_group, options::TWO_DASHES, '(',
1430                  N_("Start a library search group"), NULL);
1431   DEFINE_special(end_group, options::TWO_DASHES, ')',
1432                  N_("End a library search group"), NULL);
1433
1434   // The -z options.
1435
1436   DEFINE_bool(bndplt, options::DASH_Z, '\0', false,
1437               N_("(x86-64 only) Generate a BND PLT for Intel MPX"),
1438               N_("Generate a regular PLT"));
1439   DEFINE_bool(combreloc, options::DASH_Z, '\0', true,
1440               N_("Sort dynamic relocs"),
1441               N_("Do not sort dynamic relocs"));
1442   DEFINE_uint64(common_page_size, options::DASH_Z, '\0', 0,
1443                 N_("Set common page size to SIZE"), N_("SIZE"));
1444   DEFINE_bool(defs, options::DASH_Z, '\0', false,
1445               N_("Report undefined symbols (even with --shared)"),
1446               NULL);
1447   DEFINE_bool(execstack, options::DASH_Z, '\0', false,
1448               N_("Mark output as requiring executable stack"), NULL);
1449   DEFINE_bool(global, options::DASH_Z, '\0', false,
1450               N_("Make symbols in DSO available for subsequently loaded "
1451                  "objects"), NULL);
1452   DEFINE_bool(initfirst, options::DASH_Z, '\0', false,
1453               N_("Mark DSO to be initialized first at runtime"),
1454               NULL);
1455   DEFINE_bool(interpose, options::DASH_Z, '\0', false,
1456               N_("Mark object to interpose all DSOs but executable"),
1457               NULL);
1458   DEFINE_bool_alias(lazy, now, options::DASH_Z, '\0',
1459                     N_("Mark object for lazy runtime binding"),
1460                     NULL, true);
1461   DEFINE_bool(loadfltr, options::DASH_Z, '\0', false,
1462               N_("Mark object requiring immediate process"),
1463               NULL);
1464   DEFINE_uint64(max_page_size, options::DASH_Z, '\0', 0,
1465                 N_("Set maximum page size to SIZE"), N_("SIZE"));
1466   DEFINE_bool(muldefs, options::DASH_Z, '\0', false,
1467               N_("Allow multiple definitions of symbols"),
1468               NULL);
1469   // copyreloc is here in the list because there is only -z
1470   // nocopyreloc, not -z copyreloc.
1471   DEFINE_bool(copyreloc, options::DASH_Z, '\0', true,
1472               NULL,
1473               N_("Do not create copy relocs"));
1474   DEFINE_bool(nodefaultlib, options::DASH_Z, '\0', false,
1475               N_("Mark object not to use default search paths"),
1476               NULL);
1477   DEFINE_bool(nodelete, options::DASH_Z, '\0', false,
1478               N_("Mark DSO non-deletable at runtime"),
1479               NULL);
1480   DEFINE_bool(nodlopen, options::DASH_Z, '\0', false,
1481               N_("Mark DSO not available to dlopen"),
1482               NULL);
1483   DEFINE_bool(nodump, options::DASH_Z, '\0', false,
1484               N_("Mark DSO not available to dldump"),
1485               NULL);
1486   DEFINE_bool(noexecstack, options::DASH_Z, '\0', false,
1487               N_("Mark output as not requiring executable stack"), NULL);
1488   DEFINE_bool(now, options::DASH_Z, '\0', false,
1489               N_("Mark object for immediate function binding"),
1490               NULL);
1491   DEFINE_bool(origin, options::DASH_Z, '\0', false,
1492               N_("Mark DSO to indicate that needs immediate $ORIGIN "
1493                  "processing at runtime"), NULL);
1494   DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO,
1495               N_("Where possible mark variables read-only after relocation"),
1496               N_("Don't mark variables read-only after relocation"));
1497   DEFINE_uint64(stack_size, options::DASH_Z, '\0', 0,
1498                 N_("Set PT_GNU_STACK segment p_memsz to SIZE"), N_("SIZE"));
1499   DEFINE_bool(text, options::DASH_Z, '\0', false,
1500               N_("Do not permit relocations in read-only segments"),
1501               N_("Permit relocations in read-only segments"));
1502   DEFINE_bool_alias(textoff, text, options::DASH_Z, '\0',
1503                     N_("Permit relocations in read-only segments"),
1504                     NULL, true);
1505   DEFINE_bool(text_unlikely_segment, options::DASH_Z, '\0', false,
1506               N_("Move .text.unlikely sections to a separate segment."),
1507               N_("Do not move .text.unlikely sections to a separate "
1508                  "segment."));
1509   DEFINE_bool(keep_text_section_prefix, options::DASH_Z, '\0', false,
1510               N_("Keep .text.hot, .text.startup, .text.exit and .text.unlikely "
1511                  "as separate sections in the final binary."),
1512               N_("Merge all .text.* prefix sections."));
1513
1514
1515  public:
1516   typedef options::Dir_list Dir_list;
1517
1518   General_options();
1519
1520   // Does post-processing on flags, making sure they all have
1521   // non-conflicting values.  Also converts some flags from their
1522   // "standard" types (string, etc), to another type (enum, DirList),
1523   // which can be accessed via a separate method.  Dies if it notices
1524   // any problems.
1525   void finalize();
1526
1527   // True if we printed the version information.
1528   bool
1529   printed_version() const
1530   { return this->printed_version_; }
1531
1532   // The macro defines output() (based on --output), but that's a
1533   // generic name.  Provide this alternative name, which is clearer.
1534   const char*
1535   output_file_name() const
1536   { return this->output(); }
1537
1538   // This is not defined via a flag, but combines flags to say whether
1539   // the output is position-independent or not.
1540   bool
1541   output_is_position_independent() const
1542   { return this->shared() || this->pie(); }
1543
1544   // Return true if the output is something that can be exec()ed, such
1545   // as a static executable, or a position-dependent or
1546   // position-independent executable, but not a dynamic library or an
1547   // object file.
1548   bool
1549   output_is_executable() const
1550   { return !this->shared() && !this->relocatable(); }
1551
1552   // This would normally be static(), and defined automatically, but
1553   // since static is a keyword, we need to come up with our own name.
1554   bool
1555   is_static() const
1556   { return static_; }
1557
1558   // In addition to getting the input and output formats as a string
1559   // (via format() and oformat()), we also give access as an enum.
1560   enum Object_format
1561   {
1562     // Ordinary ELF.
1563     OBJECT_FORMAT_ELF,
1564     // Straight binary format.
1565     OBJECT_FORMAT_BINARY
1566   };
1567
1568   // Convert a string to an Object_format.  Gives an error if the
1569   // string is not recognized.
1570   static Object_format
1571   string_to_object_format(const char* arg);
1572
1573   // Convert an Object_format to string.
1574   static const char*
1575   object_format_to_string(Object_format);
1576
1577   // Note: these functions are not very fast.
1578   Object_format format_enum() const;
1579   Object_format oformat_enum() const;
1580
1581   // Return whether FILENAME is in a system directory.
1582   bool
1583   is_in_system_directory(const std::string& name) const;
1584
1585   // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_.
1586   bool
1587   should_retain_symbol(const char* symbol_name) const
1588     {
1589       if (symbols_to_retain_.empty())    // means flag wasn't specified
1590         return true;
1591       return symbols_to_retain_.find(symbol_name) != symbols_to_retain_.end();
1592     }
1593
1594   // These are the best way to get access to the execstack state,
1595   // not execstack() and noexecstack() which are hard to use properly.
1596   bool
1597   is_execstack_set() const
1598   { return this->execstack_status_ != EXECSTACK_FROM_INPUT; }
1599
1600   bool
1601   is_stack_executable() const
1602   { return this->execstack_status_ == EXECSTACK_YES; }
1603
1604   bool
1605   icf_enabled() const
1606   { return this->icf_status_ != ICF_NONE; }
1607
1608   bool
1609   icf_safe_folding() const
1610   { return this->icf_status_ == ICF_SAFE; }
1611
1612   // The --demangle option takes an optional string, and there is also
1613   // a --no-demangle option.  This is the best way to decide whether
1614   // to demangle or not.
1615   bool
1616   do_demangle() const
1617   { return this->do_demangle_; }
1618
1619   // Returns TRUE if any plugin libraries have been loaded.
1620   bool
1621   has_plugins() const
1622   { return this->plugins_ != NULL; }
1623
1624   // Return a pointer to the plugin manager.
1625   Plugin_manager*
1626   plugins() const
1627   { return this->plugins_; }
1628
1629   // True iff SYMBOL was found in the file specified by dynamic-list.
1630   bool
1631   in_dynamic_list(const char* symbol) const
1632   { return this->dynamic_list_.version_script_info()->symbol_is_local(symbol); }
1633
1634   // True if a --dynamic-list script was provided.
1635   bool
1636   have_dynamic_list() const
1637   { return this->have_dynamic_list_; }
1638
1639   // Finalize the dynamic list.
1640   void
1641   finalize_dynamic_list()
1642   { this->dynamic_list_.version_script_info()->finalize(); }
1643
1644   // The mode selected by the --incremental options.
1645   enum Incremental_mode
1646   {
1647     // No incremental linking (--no-incremental).
1648     INCREMENTAL_OFF,
1649     // Incremental update only (--incremental-update).
1650     INCREMENTAL_UPDATE,
1651     // Force a full link, but prepare for subsequent incremental link
1652     // (--incremental-full).
1653     INCREMENTAL_FULL,
1654     // Incremental update if possible, fallback to full link  (--incremental).
1655     INCREMENTAL_AUTO
1656   };
1657
1658   // The incremental linking mode.
1659   Incremental_mode
1660   incremental_mode() const
1661   { return this->incremental_mode_; }
1662
1663   // The disposition given by the --incremental-changed,
1664   // --incremental-unchanged or --incremental-unknown option.  The
1665   // value may change as we proceed parsing the command line flags.
1666   Incremental_disposition
1667   incremental_disposition() const
1668   { return this->incremental_disposition_; }
1669
1670   void
1671   set_incremental_disposition(Incremental_disposition disp)
1672   { this->incremental_disposition_ = disp; }
1673
1674   // The disposition to use for startup files (those that precede the
1675   // first --incremental-changed, etc. option).
1676   Incremental_disposition
1677   incremental_startup_disposition() const
1678   { return this->incremental_startup_disposition_; }
1679
1680   // Return true if S is the name of a library excluded from automatic
1681   // symbol export.
1682   bool
1683   check_excluded_libs(const std::string &s) const;
1684
1685   // If an explicit start address was given for section SECNAME with
1686   // the --section-start option, return true and set *PADDR to the
1687   // address.  Otherwise return false.
1688   bool
1689   section_start(const char* secname, uint64_t* paddr) const;
1690
1691   // Return whether any --section-start option was used.
1692   bool
1693   any_section_start() const
1694   { return !this->section_starts_.empty(); }
1695
1696   enum Fix_v4bx
1697   {
1698     // Leave original instruction.
1699     FIX_V4BX_NONE,
1700     // Replace instruction.
1701     FIX_V4BX_REPLACE,
1702     // Generate an interworking veneer.
1703     FIX_V4BX_INTERWORKING
1704   };
1705
1706   Fix_v4bx
1707   fix_v4bx() const
1708   { return (this->fix_v4bx_); }
1709
1710   enum Endianness
1711   {
1712     ENDIANNESS_NOT_SET,
1713     ENDIANNESS_BIG,
1714     ENDIANNESS_LITTLE
1715   };
1716
1717   Endianness
1718   endianness() const
1719   { return this->endianness_; }
1720
1721   bool
1722   discard_all() const
1723   { return this->discard_locals_ == DISCARD_ALL; }
1724
1725   bool
1726   discard_locals() const
1727   { return this->discard_locals_ == DISCARD_LOCALS; }
1728
1729   bool
1730   discard_sec_merge() const
1731   { return this->discard_locals_ == DISCARD_SEC_MERGE; }
1732
1733   enum Orphan_handling
1734   {
1735     // Place orphan sections normally (default).
1736     ORPHAN_PLACE,
1737     // Discard all orphan sections.
1738     ORPHAN_DISCARD,
1739     // Warn when placing orphan sections.
1740     ORPHAN_WARN,
1741     // Issue error for orphan sections.
1742     ORPHAN_ERROR
1743   };
1744
1745   Orphan_handling
1746   orphan_handling_enum() const
1747   { return this->orphan_handling_enum_; }
1748
1749  private:
1750   // Don't copy this structure.
1751   General_options(const General_options&);
1752   General_options& operator=(const General_options&);
1753
1754   // What local symbols to discard.
1755   enum Discard_locals
1756   {
1757     // Locals in merge sections (default).
1758     DISCARD_SEC_MERGE,
1759     // None (--discard-none).
1760     DISCARD_NONE,
1761     // Temporary locals (--discard-locals/-X).
1762     DISCARD_LOCALS,
1763     // All locals (--discard-all/-x).
1764     DISCARD_ALL
1765   };
1766
1767   // Whether to mark the stack as executable.
1768   enum Execstack
1769   {
1770     // Not set on command line.
1771     EXECSTACK_FROM_INPUT,
1772     // Mark the stack as executable (-z execstack).
1773     EXECSTACK_YES,
1774     // Mark the stack as not executable (-z noexecstack).
1775     EXECSTACK_NO
1776   };
1777
1778   enum Icf_status
1779   {
1780     // Do not fold any functions (Default or --icf=none).
1781     ICF_NONE,
1782     // All functions are candidates for folding. (--icf=all).
1783     ICF_ALL,
1784     // Only ctors and dtors are candidates for folding. (--icf=safe).
1785     ICF_SAFE
1786   };
1787
1788   void
1789   set_icf_status(Icf_status value)
1790   { this->icf_status_ = value; }
1791
1792   void
1793   set_execstack_status(Execstack value)
1794   { this->execstack_status_ = value; }
1795
1796   void
1797   set_do_demangle(bool value)
1798   { this->do_demangle_ = value; }
1799
1800   void
1801   set_static(bool value)
1802   { static_ = value; }
1803
1804   void
1805   set_orphan_handling_enum(Orphan_handling value)
1806   { this->orphan_handling_enum_ = value; }
1807
1808   // These are called by finalize() to set up the search-path correctly.
1809   void
1810   add_to_library_path_with_sysroot(const std::string& arg)
1811   { this->add_search_directory_to_library_path(Search_directory(arg, true)); }
1812
1813   // Apply any sysroot to the directory lists.
1814   void
1815   add_sysroot();
1816
1817   // Add a plugin and its arguments to the list of plugins.
1818   void
1819   add_plugin(const char* filename);
1820
1821   // Add a plugin option.
1822   void
1823   add_plugin_option(const char* opt);
1824
1825   void
1826   copy_from_posdep_options(const Position_dependent_options&);
1827
1828   // Whether we printed version information.
1829   bool printed_version_;
1830   // Whether to mark the stack as executable.
1831   Execstack execstack_status_;
1832   // Whether to do code folding.
1833   Icf_status icf_status_;
1834   // Whether to do a static link.
1835   bool static_;
1836   // Whether to do demangling.
1837   bool do_demangle_;
1838   // List of plugin libraries.
1839   Plugin_manager* plugins_;
1840   // The parsed output of --dynamic-list files.  For convenience in
1841   // script.cc, we store this as a Script_options object, even though
1842   // we only use a single Version_tree from it.
1843   Script_options dynamic_list_;
1844   // Whether a --dynamic-list file was provided.
1845   bool have_dynamic_list_;
1846   // The incremental linking mode.
1847   Incremental_mode incremental_mode_;
1848   // The disposition given by the --incremental-changed,
1849   // --incremental-unchanged or --incremental-unknown option.  The
1850   // value may change as we proceed parsing the command line flags.
1851   Incremental_disposition incremental_disposition_;
1852   // The disposition to use for startup files (those marked
1853   // INCREMENTAL_STARTUP).
1854   Incremental_disposition incremental_startup_disposition_;
1855   // Whether we have seen one of the options that require incremental
1856   // build (--incremental-changed, --incremental-unchanged,
1857   // --incremental-unknown, or --incremental-startup-unchanged).
1858   bool implicit_incremental_;
1859   // Libraries excluded from automatic export, via --exclude-libs.
1860   Unordered_set<std::string> excluded_libs_;
1861   // List of symbol-names to keep, via -retain-symbol-info.
1862   Unordered_set<std::string> symbols_to_retain_;
1863   // Map from section name to address from --section-start.
1864   std::map<std::string, uint64_t> section_starts_;
1865   // Whether to process armv4 bx instruction relocation.
1866   Fix_v4bx fix_v4bx_;
1867   // Endianness.
1868   Endianness endianness_;
1869   // What local symbols to discard.
1870   Discard_locals discard_locals_;
1871   // Stack of saved options for --push-state/--pop-state.
1872   std::vector<Position_dependent_options*> options_stack_;
1873   // Orphan handling option, decoded to an enum value.
1874   Orphan_handling orphan_handling_enum_;
1875 };
1876
1877 // The position-dependent options.  We use this to store the state of
1878 // the commandline at a particular point in parsing for later
1879 // reference.  For instance, if we see "ld --whole-archive foo.a
1880 // --no-whole-archive," we want to store the whole-archive option with
1881 // foo.a, so when the time comes to parse foo.a we know we should do
1882 // it in whole-archive mode.  We could store all of General_options,
1883 // but that's big, so we just pick the subset of flags that actually
1884 // change in a position-dependent way.
1885
1886 #define DEFINE_posdep(varname__, type__)        \
1887  public:                                        \
1888   type__                                        \
1889   varname__() const                             \
1890   { return this->varname__##_; }                \
1891                                                 \
1892   void                                          \
1893   set_##varname__(type__ value)                 \
1894   { this->varname__##_ = value; }               \
1895  private:                                       \
1896   type__ varname__##_
1897
1898 class Position_dependent_options
1899 {
1900  public:
1901   Position_dependent_options(const General_options& options
1902                              = Position_dependent_options::default_options_)
1903   { copy_from_options(options); }
1904
1905   void
1906   copy_from_options(const General_options& options)
1907   {
1908     this->set_as_needed(options.as_needed());
1909     this->set_Bdynamic(options.Bdynamic());
1910     this->set_format_enum(options.format_enum());
1911     this->set_whole_archive(options.whole_archive());
1912     this->set_incremental_disposition(options.incremental_disposition());
1913   }
1914
1915   DEFINE_posdep(as_needed, bool);
1916   DEFINE_posdep(Bdynamic, bool);
1917   DEFINE_posdep(format_enum, General_options::Object_format);
1918   DEFINE_posdep(whole_archive, bool);
1919   DEFINE_posdep(incremental_disposition, Incremental_disposition);
1920
1921  private:
1922   // This is a General_options with everything set to its default
1923   // value.  A Position_dependent_options created with no argument
1924   // will take its values from here.
1925   static General_options default_options_;
1926 };
1927
1928
1929 // A single file or library argument from the command line.
1930
1931 class Input_file_argument
1932 {
1933  public:
1934   enum Input_file_type
1935   {
1936     // A regular file, name used as-is, not searched.
1937     INPUT_FILE_TYPE_FILE,
1938     // A library name.  When used, "lib" will be prepended and ".so" or
1939     // ".a" appended to make a filename, and that filename will be searched
1940     // for using the -L paths.
1941     INPUT_FILE_TYPE_LIBRARY,
1942     // A regular file, name used as-is, but searched using the -L paths.
1943     INPUT_FILE_TYPE_SEARCHED_FILE
1944   };
1945
1946   // name: file name or library name
1947   // type: the type of this input file.
1948   // extra_search_path: an extra directory to look for the file, prior
1949   //         to checking the normal library search path.  If this is "",
1950   //         then no extra directory is added.
1951   // just_symbols: whether this file only defines symbols.
1952   // options: The position dependent options at this point in the
1953   //         command line, such as --whole-archive.
1954   Input_file_argument()
1955     : name_(), type_(INPUT_FILE_TYPE_FILE), extra_search_path_(""),
1956       just_symbols_(false), options_(), arg_serial_(0)
1957   { }
1958
1959   Input_file_argument(const char* name, Input_file_type type,
1960                       const char* extra_search_path,
1961                       bool just_symbols,
1962                       const Position_dependent_options& options)
1963     : name_(name), type_(type), extra_search_path_(extra_search_path),
1964       just_symbols_(just_symbols), options_(options), arg_serial_(0)
1965   { }
1966
1967   // You can also pass in a General_options instance instead of a
1968   // Position_dependent_options.  In that case, we extract the
1969   // position-independent vars from the General_options and only store
1970   // those.
1971   Input_file_argument(const char* name, Input_file_type type,
1972                       const char* extra_search_path,
1973                       bool just_symbols,
1974                       const General_options& options)
1975     : name_(name), type_(type), extra_search_path_(extra_search_path),
1976       just_symbols_(just_symbols), options_(options), arg_serial_(0)
1977   { }
1978
1979   const char*
1980   name() const
1981   { return this->name_.c_str(); }
1982
1983   const Position_dependent_options&
1984   options() const
1985   { return this->options_; }
1986
1987   bool
1988   is_lib() const
1989   { return type_ == INPUT_FILE_TYPE_LIBRARY; }
1990
1991   bool
1992   is_searched_file() const
1993   { return type_ == INPUT_FILE_TYPE_SEARCHED_FILE; }
1994
1995   const char*
1996   extra_search_path() const
1997   {
1998     return (this->extra_search_path_.empty()
1999             ? NULL
2000             : this->extra_search_path_.c_str());
2001   }
2002
2003   // Return whether we should only read symbols from this file.
2004   bool
2005   just_symbols() const
2006   { return this->just_symbols_; }
2007
2008   // Return whether this file may require a search using the -L
2009   // options.
2010   bool
2011   may_need_search() const
2012   {
2013     return (this->is_lib()
2014             || this->is_searched_file()
2015             || !this->extra_search_path_.empty());
2016   }
2017
2018   // Set the serial number for this argument.
2019   void
2020   set_arg_serial(unsigned int arg_serial)
2021   { this->arg_serial_ = arg_serial; }
2022
2023   // Get the serial number.
2024   unsigned int
2025   arg_serial() const
2026   { return this->arg_serial_; }
2027
2028  private:
2029   // We use std::string, not const char*, here for convenience when
2030   // using script files, so that we do not have to preserve the string
2031   // in that case.
2032   std::string name_;
2033   Input_file_type type_;
2034   std::string extra_search_path_;
2035   bool just_symbols_;
2036   Position_dependent_options options_;
2037   // A unique index for this file argument in the argument list.
2038   unsigned int arg_serial_;
2039 };
2040
2041 // A file or library, or a group, from the command line.
2042
2043 class Input_argument
2044 {
2045  public:
2046   // Create a file or library argument.
2047   explicit Input_argument(Input_file_argument file)
2048     : is_file_(true), file_(file), group_(NULL), lib_(NULL), script_info_(NULL)
2049   { }
2050
2051   // Create a group argument.
2052   explicit Input_argument(Input_file_group* group)
2053     : is_file_(false), group_(group), lib_(NULL), script_info_(NULL)
2054   { }
2055
2056   // Create a lib argument.
2057   explicit Input_argument(Input_file_lib* lib)
2058     : is_file_(false), group_(NULL), lib_(lib), script_info_(NULL)
2059   { }
2060
2061   // Return whether this is a file.
2062   bool
2063   is_file() const
2064   { return this->is_file_; }
2065
2066   // Return whether this is a group.
2067   bool
2068   is_group() const
2069   { return !this->is_file_ && this->lib_ == NULL; }
2070
2071   // Return whether this is a lib.
2072   bool
2073   is_lib() const
2074   { return this->lib_ != NULL; }
2075
2076   // Return the information about the file.
2077   const Input_file_argument&
2078   file() const
2079   {
2080     gold_assert(this->is_file_);
2081     return this->file_;
2082   }
2083
2084   // Return the information about the group.
2085   const Input_file_group*
2086   group() const
2087   {
2088     gold_assert(!this->is_file_);
2089     return this->group_;
2090   }
2091
2092   Input_file_group*
2093   group()
2094   {
2095     gold_assert(!this->is_file_);
2096     return this->group_;
2097   }
2098
2099   // Return the information about the lib.
2100   const Input_file_lib*
2101   lib() const
2102   {
2103     gold_assert(!this->is_file_);
2104     gold_assert(this->lib_);
2105     return this->lib_;
2106   }
2107
2108   Input_file_lib*
2109   lib()
2110   {
2111     gold_assert(!this->is_file_);
2112     gold_assert(this->lib_);
2113     return this->lib_;
2114   }
2115
2116   // If a script generated this argument, store a pointer to the script info.
2117   // Currently used only for recording incremental link information.
2118   void
2119   set_script_info(Script_info* info)
2120   { this->script_info_ = info; }
2121
2122   Script_info*
2123   script_info() const
2124   { return this->script_info_; }
2125
2126  private:
2127   bool is_file_;
2128   Input_file_argument file_;
2129   Input_file_group* group_;
2130   Input_file_lib* lib_;
2131   Script_info* script_info_;
2132 };
2133
2134 typedef std::vector<Input_argument> Input_argument_list;
2135
2136 // A group from the command line.  This is a set of arguments within
2137 // --start-group ... --end-group.
2138
2139 class Input_file_group
2140 {
2141  public:
2142   typedef Input_argument_list::const_iterator const_iterator;
2143
2144   Input_file_group()
2145     : files_()
2146   { }
2147
2148   // Add a file to the end of the group.
2149   Input_argument&
2150   add_file(const Input_file_argument& arg)
2151   {
2152     this->files_.push_back(Input_argument(arg));
2153     return this->files_.back();
2154   }
2155
2156   // Iterators to iterate over the group contents.
2157
2158   const_iterator
2159   begin() const
2160   { return this->files_.begin(); }
2161
2162   const_iterator
2163   end() const
2164   { return this->files_.end(); }
2165
2166  private:
2167   Input_argument_list files_;
2168 };
2169
2170 // A lib from the command line.  This is a set of arguments within
2171 // --start-lib ... --end-lib.
2172
2173 class Input_file_lib
2174 {
2175  public:
2176   typedef Input_argument_list::const_iterator const_iterator;
2177
2178   Input_file_lib(const Position_dependent_options& options)
2179     : files_(), options_(options)
2180   { }
2181
2182   // Add a file to the end of the lib.
2183   Input_argument&
2184   add_file(const Input_file_argument& arg)
2185   {
2186     this->files_.push_back(Input_argument(arg));
2187     return this->files_.back();
2188   }
2189
2190   const Position_dependent_options&
2191   options() const
2192   { return this->options_; }
2193
2194   // Iterators to iterate over the lib contents.
2195
2196   const_iterator
2197   begin() const
2198   { return this->files_.begin(); }
2199
2200   const_iterator
2201   end() const
2202   { return this->files_.end(); }
2203
2204   size_t
2205   size() const
2206   { return this->files_.size(); }
2207
2208  private:
2209   Input_argument_list files_;
2210   Position_dependent_options options_;
2211 };
2212
2213 // A list of files from the command line or a script.
2214
2215 class Input_arguments
2216 {
2217  public:
2218   typedef Input_argument_list::const_iterator const_iterator;
2219
2220   Input_arguments()
2221     : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0)
2222   { }
2223
2224   // Add a file.
2225   Input_argument&
2226   add_file(Input_file_argument& arg);
2227
2228   // Start a group (the --start-group option).
2229   void
2230   start_group();
2231
2232   // End a group (the --end-group option).
2233   void
2234   end_group();
2235
2236   // Start a lib (the --start-lib option).
2237   void
2238   start_lib(const Position_dependent_options&);
2239
2240   // End a lib (the --end-lib option).
2241   void
2242   end_lib();
2243
2244   // Return whether we are currently in a group.
2245   bool
2246   in_group() const
2247   { return this->in_group_; }
2248
2249   // Return whether we are currently in a lib.
2250   bool
2251   in_lib() const
2252   { return this->in_lib_; }
2253
2254   // The number of entries in the list.
2255   int
2256   size() const
2257   { return this->input_argument_list_.size(); }
2258
2259   // Iterators to iterate over the list of input files.
2260
2261   const_iterator
2262   begin() const
2263   { return this->input_argument_list_.begin(); }
2264
2265   const_iterator
2266   end() const
2267   { return this->input_argument_list_.end(); }
2268
2269   // Return whether the list is empty.
2270   bool
2271   empty() const
2272   { return this->input_argument_list_.empty(); }
2273
2274   // Return the number of input files.  This may be larger than
2275   // input_argument_list_.size(), because of files that are part
2276   // of groups or libs.
2277   int
2278   number_of_input_files() const
2279   { return this->file_count_; }
2280
2281  private:
2282   Input_argument_list input_argument_list_;
2283   bool in_group_;
2284   bool in_lib_;
2285   unsigned int file_count_;
2286 };
2287
2288
2289 // All the information read from the command line.  These are held in
2290 // three separate structs: one to hold the options (--foo), one to
2291 // hold the filenames listed on the commandline, and one to hold
2292 // linker script information.  This third is not a subset of the other
2293 // two because linker scripts can be specified either as options (via
2294 // -T) or as a file.
2295
2296 class Command_line
2297 {
2298  public:
2299   typedef Input_arguments::const_iterator const_iterator;
2300
2301   Command_line();
2302
2303   // Process the command line options.  This will exit with an
2304   // appropriate error message if an unrecognized option is seen.
2305   void
2306   process(int argc, const char** argv);
2307
2308   // Process one command-line option.  This takes the index of argv to
2309   // process, and returns the index for the next option.  no_more_options
2310   // is set to true if argv[i] is "--".
2311   int
2312   process_one_option(int argc, const char** argv, int i,
2313                      bool* no_more_options);
2314
2315   // Get the general options.
2316   const General_options&
2317   options() const
2318   { return this->options_; }
2319
2320   // Get the position dependent options.
2321   const Position_dependent_options&
2322   position_dependent_options() const
2323   { return this->position_options_; }
2324
2325   // Get the linker-script options.
2326   Script_options&
2327   script_options()
2328   { return this->script_options_; }
2329
2330   // Finalize the version-script options and return them.
2331   const Version_script_info&
2332   version_script();
2333
2334   // Get the input files.
2335   Input_arguments&
2336   inputs()
2337   { return this->inputs_; }
2338
2339   // The number of input files.
2340   int
2341   number_of_input_files() const
2342   { return this->inputs_.number_of_input_files(); }
2343
2344   // Iterators to iterate over the list of input files.
2345
2346   const_iterator
2347   begin() const
2348   { return this->inputs_.begin(); }
2349
2350   const_iterator
2351   end() const
2352   { return this->inputs_.end(); }
2353
2354  private:
2355   Command_line(const Command_line&);
2356   Command_line& operator=(const Command_line&);
2357
2358   // This is a dummy class to provide a constructor that runs before
2359   // the constructor for the General_options.  The Pre_options constructor
2360   // is used as a hook to set the flag enabling the options to register
2361   // themselves.
2362   struct Pre_options {
2363     Pre_options();
2364   };
2365
2366   // This must come before options_!
2367   Pre_options pre_options_;
2368   General_options options_;
2369   Position_dependent_options position_options_;
2370   Script_options script_options_;
2371   Input_arguments inputs_;
2372 };
2373
2374 } // End namespace gold.
2375
2376 #endif // !defined(GOLD_OPTIONS_H)