1 // options.h -- handle command line options for gold -*- C++ -*-
3 // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2013
4 // Free Software Foundation, Inc.
5 // Written by Ian Lance Taylor <iant@google.com>.
7 // This file is part of gold.
9 // This program is free software; you can redistribute it and/or modify
10 // it under the terms of the GNU General Public License as published by
11 // the Free Software Foundation; either version 3 of the License, or
12 // (at your option) any later version.
14 // This program is distributed in the hope that it will be useful,
15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 // MA 02110-1301, USA.
24 // General_options (from Command_line::options())
25 // All the options (a.k.a. command-line flags)
26 // Input_argument (from Command_line::inputs())
27 // The list of input files, including -l options.
29 // Everything we get from the command line -- the General_options
30 // plus the Input_arguments.
32 // There are also some smaller classes, such as
33 // Position_dependent_options which hold a subset of General_options
34 // that change as options are parsed (as opposed to the usual behavior
35 // of the last instance of that option specified on the commandline wins).
37 #ifndef GOLD_OPTIONS_H
38 #define GOLD_OPTIONS_H
54 class General_options
;
55 class Search_directory
;
56 class Input_file_group
;
58 class Position_dependent_options
;
63 // Incremental build action for a specific file, as selected by the user.
65 enum Incremental_disposition
67 // Startup files that appear before the first disposition option.
68 // These will default to INCREMENTAL_CHECK unless the
69 // --incremental-startup-unchanged option is given.
70 // (For files added implicitly by gcc before any user options.)
72 // Determine the status from the timestamp (default).
74 // Assume the file changed from the previous build.
76 // Assume the file didn't change from the previous build.
80 // The nested namespace is to contain all the global variables and
81 // structs that need to be defined in the .h file, but do not need to
82 // be used outside this class.
85 typedef std::vector
<Search_directory
> Dir_list
;
86 typedef Unordered_set
<std::string
> String_set
;
88 // These routines convert from a string option to various types.
89 // Each gives a fatal error if it cannot parse the argument.
92 parse_bool(const char* option_name
, const char* arg
, bool* retval
);
95 parse_int(const char* option_name
, const char* arg
, int* retval
);
98 parse_uint(const char* option_name
, const char* arg
, int* retval
);
101 parse_uint64(const char* option_name
, const char* arg
, uint64_t* retval
);
104 parse_double(const char* option_name
, const char* arg
, double* retval
);
107 parse_percent(const char* option_name
, const char* arg
, double* retval
);
110 parse_string(const char* option_name
, const char* arg
, const char** retval
);
113 parse_optional_string(const char* option_name
, const char* arg
,
114 const char** retval
);
117 parse_dirlist(const char* option_name
, const char* arg
, Dir_list
* retval
);
120 parse_set(const char* option_name
, const char* arg
, String_set
* retval
);
123 parse_choices(const char* option_name
, const char* arg
, const char** retval
,
124 const char* choices
[], int num_choices
);
128 // Most options have both a shortname (one letter) and a longname.
129 // This enum controls how many dashes are expected for longname access
130 // -- shortnames always use one dash. Most longnames will accept
131 // either one dash or two; the only difference between ONE_DASH and
132 // TWO_DASHES is how we print the option in --help. However, some
133 // longnames require two dashes, and some require only one. The
134 // special value DASH_Z means that the option is preceded by "-z".
137 ONE_DASH
, TWO_DASHES
, EXACTLY_ONE_DASH
, EXACTLY_TWO_DASHES
, DASH_Z
140 // LONGNAME is the long-name of the option with dashes converted to
141 // underscores, or else the short-name if the option has no long-name.
142 // It is never the empty string.
143 // DASHES is an instance of the Dashes enum: ONE_DASH, TWO_DASHES, etc.
144 // SHORTNAME is the short-name of the option, as a char, or '\0' if the
145 // option has no short-name. If the option has no long-name, you
146 // should specify the short-name in *both* VARNAME and here.
147 // DEFAULT_VALUE is the value of the option if not specified on the
148 // commandline, as a string.
149 // HELPSTRING is the descriptive text used with the option via --help
150 // HELPARG is how you define the argument to the option.
151 // --help output is "-shortname HELPARG, --longname HELPARG: HELPSTRING"
152 // HELPARG should be NULL iff the option is a bool and takes no arg.
153 // OPTIONAL_ARG is true if this option takes an optional argument. An
154 // optional argument must be specifid as --OPTION=VALUE, not
156 // READER provides parse_to_value, which is a function that will convert
157 // a char* argument into the proper type and store it in some variable.
158 // A One_option struct initializes itself with the global list of options
159 // at constructor time, so be careful making one of these.
162 std::string longname
;
165 const char* default_value
;
166 const char* helpstring
;
171 One_option(const char* ln
, Dashes d
, char sn
, const char* dv
,
172 const char* hs
, const char* ha
, bool oa
, Struct_var
* r
)
173 : longname(ln
), dashes(d
), shortname(sn
), default_value(dv
? dv
: ""),
174 helpstring(hs
), helparg(ha
), optional_arg(oa
), reader(r
)
176 // In longname, we convert all underscores to dashes, since GNU
177 // style uses dashes in option names. longname is likely to have
178 // underscores in it because it's also used to declare a C++
180 const char* pos
= strchr(this->longname
.c_str(), '_');
181 for (; pos
; pos
= strchr(pos
, '_'))
182 this->longname
[pos
- this->longname
.c_str()] = '-';
184 // We only register ourselves if our helpstring is not NULL. This
185 // is to support the "no-VAR" boolean variables, which we
186 // conditionally turn on by defining "no-VAR" help text.
187 if (this->helpstring
)
188 this->register_option();
191 // This option takes an argument iff helparg is not NULL.
193 takes_argument() const
194 { return this->helparg
!= NULL
; }
196 // Whether the argument is optional.
198 takes_optional_argument() const
199 { return this->optional_arg
; }
201 // Register this option with the global list of options.
205 // Print this option to stdout (used with --help).
210 // All options have a Struct_##varname that inherits from this and
211 // actually implements parse_to_value for that option.
214 // OPTION: the name of the option as specified on the commandline,
215 // including leading dashes, and any text following the option:
216 // "-O", "--defsym=mysym=0x1000", etc.
217 // ARG: the arg associated with this option, or NULL if the option
218 // takes no argument: "2", "mysym=0x1000", etc.
219 // CMDLINE: the global Command_line object. Used by DEFINE_special.
220 // OPTIONS: the global General_options object. Used by DEFINE_special.
222 parse_to_value(const char* option
, const char* arg
,
223 Command_line
* cmdline
, General_options
* options
) = 0;
225 ~Struct_var() // To make gcc happy.
229 // This is for "special" options that aren't of any predefined type.
230 struct Struct_special
: public Struct_var
232 // If you change this, change the parse-fn in DEFINE_special as well.
233 typedef void (General_options::*Parse_function
)(const char*, const char*,
235 Struct_special(const char* varname
, Dashes dashes
, char shortname
,
236 Parse_function parse_function
,
237 const char* helpstring
, const char* helparg
)
238 : option(varname
, dashes
, shortname
, "", helpstring
, helparg
, false, this),
239 parse(parse_function
)
242 void parse_to_value(const char* option
, const char* arg
,
243 Command_line
* cmdline
, General_options
* options
)
244 { (options
->*(this->parse
))(option
, arg
, cmdline
); }
247 Parse_function parse
;
250 } // End namespace options.
253 // These are helper macros use by DEFINE_uint64/etc below.
254 // This macro is used inside the General_options_ class, so defines
255 // var() and set_var() as General_options methods. Arguments as are
256 // for the constructor for One_option. param_type__ is the same as
257 // type__ for built-in types, and "const type__ &" otherwise.
259 // When we define the linker command option "assert", the macro argument
260 // varname__ of DEFINE_var below will be replaced by "assert". On Mac OSX
261 // assert.h is included implicitly by one of the library headers we use. To
262 // avoid unintended macro substitution of "assert()", we need to enclose
263 // varname__ with parenthese.
264 #define DEFINE_var(varname__, dashes__, shortname__, default_value__, \
265 default_value_as_string__, helpstring__, helparg__, \
266 optional_arg__, type__, param_type__, parse_fn__) \
269 (varname__)() const \
270 { return this->varname__##_.value; } \
273 user_set_##varname__() const \
274 { return this->varname__##_.user_set_via_option; } \
277 set_user_set_##varname__() \
278 { this->varname__##_.user_set_via_option = true; } \
281 struct Struct_##varname__ : public options::Struct_var \
283 Struct_##varname__() \
284 : option(#varname__, dashes__, shortname__, default_value_as_string__, \
285 helpstring__, helparg__, optional_arg__, this), \
286 user_set_via_option(false), value(default_value__) \
290 parse_to_value(const char* option_name, const char* arg, \
291 Command_line*, General_options*) \
293 parse_fn__(option_name, arg, &this->value); \
294 this->user_set_via_option = true; \
297 options::One_option option; \
298 bool user_set_via_option; \
301 Struct_##varname__ varname__##_; \
303 set_##varname__(param_type__ value) \
304 { this->varname__##_.value = value; }
306 // These macros allow for easy addition of a new commandline option.
308 // If no_helpstring__ is not NULL, then in addition to creating
309 // VARNAME, we also create an option called no-VARNAME (or, for a -z
310 // option, noVARNAME).
311 #define DEFINE_bool(varname__, dashes__, shortname__, default_value__, \
312 helpstring__, no_helpstring__) \
313 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
314 default_value__ ? "true" : "false", helpstring__, NULL, \
315 false, bool, bool, options::parse_bool) \
316 struct Struct_no_##varname__ : public options::Struct_var \
318 Struct_no_##varname__() : option((dashes__ == options::DASH_Z \
320 : "no-" #varname__), \
322 default_value__ ? "false" : "true", \
323 no_helpstring__, NULL, false, this) \
327 parse_to_value(const char*, const char*, \
328 Command_line*, General_options* options) \
330 options->set_##varname__(false); \
331 options->set_user_set_##varname__(); \
334 options::One_option option; \
336 Struct_no_##varname__ no_##varname__##_initializer_
338 #define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \
339 helpstring__, no_helpstring__) \
340 DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \
341 default_value__ ? "true" : "false", helpstring__, NULL, \
342 false, bool, bool, options::parse_bool) \
343 struct Struct_disable_##varname__ : public options::Struct_var \
345 Struct_disable_##varname__() : option("disable-" #varname__, \
347 default_value__ ? "false" : "true", \
348 no_helpstring__, NULL, false, this) \
352 parse_to_value(const char*, const char*, \
353 Command_line*, General_options* options) \
354 { options->set_enable_##varname__(false); } \
356 options::One_option option; \
358 Struct_disable_##varname__ disable_##varname__##_initializer_
360 #define DEFINE_int(varname__, dashes__, shortname__, default_value__, \
361 helpstring__, helparg__) \
362 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
363 #default_value__, helpstring__, helparg__, false, \
364 int, int, options::parse_int)
366 #define DEFINE_uint(varname__, dashes__, shortname__, default_value__, \
367 helpstring__, helparg__) \
368 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
369 #default_value__, helpstring__, helparg__, false, \
370 int, int, options::parse_uint)
372 #define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \
373 helpstring__, helparg__) \
374 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
375 #default_value__, helpstring__, helparg__, false, \
376 uint64_t, uint64_t, options::parse_uint64)
378 #define DEFINE_double(varname__, dashes__, shortname__, default_value__, \
379 helpstring__, helparg__) \
380 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
381 #default_value__, helpstring__, helparg__, false, \
382 double, double, options::parse_double)
384 #define DEFINE_percent(varname__, dashes__, shortname__, default_value__, \
385 helpstring__, helparg__) \
386 DEFINE_var(varname__, dashes__, shortname__, default_value__ / 100.0, \
387 #default_value__, helpstring__, helparg__, false, \
388 double, double, options::parse_percent)
390 #define DEFINE_string(varname__, dashes__, shortname__, default_value__, \
391 helpstring__, helparg__) \
392 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
393 default_value__, helpstring__, helparg__, false, \
394 const char*, const char*, options::parse_string)
396 // This is like DEFINE_string, but we convert each occurrence to a
397 // Search_directory and store it in a vector. Thus we also have the
398 // add_to_VARNAME() method, to append to the vector.
399 #define DEFINE_dirlist(varname__, dashes__, shortname__, \
400 helpstring__, helparg__) \
401 DEFINE_var(varname__, dashes__, shortname__, , \
402 "", helpstring__, helparg__, false, options::Dir_list, \
403 const options::Dir_list&, options::parse_dirlist) \
405 add_to_##varname__(const char* new_value) \
406 { options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \
408 add_search_directory_to_##varname__(const Search_directory& dir) \
409 { this->varname__##_.value.push_back(dir); }
411 // This is like DEFINE_string, but we store a set of strings.
412 #define DEFINE_set(varname__, dashes__, shortname__, \
413 helpstring__, helparg__) \
414 DEFINE_var(varname__, dashes__, shortname__, , \
415 "", helpstring__, helparg__, false, options::String_set, \
416 const options::String_set&, options::parse_set) \
419 any_##varname__() const \
420 { return !this->varname__##_.value.empty(); } \
423 is_##varname__(const char* symbol) const \
425 return (!this->varname__##_.value.empty() \
426 && (this->varname__##_.value.find(std::string(symbol)) \
427 != this->varname__##_.value.end())); \
430 options::String_set::const_iterator \
431 varname__##_begin() const \
432 { return this->varname__##_.value.begin(); } \
434 options::String_set::const_iterator \
435 varname__##_end() const \
436 { return this->varname__##_.value.end(); }
438 // When you have a list of possible values (expressed as string)
439 // After helparg__ should come an initializer list, like
440 // {"foo", "bar", "baz"}
441 #define DEFINE_enum(varname__, dashes__, shortname__, default_value__, \
442 helpstring__, helparg__, ...) \
443 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
444 default_value__, helpstring__, helparg__, false, \
445 const char*, const char*, parse_choices_##varname__) \
447 static void parse_choices_##varname__(const char* option_name, \
449 const char** retval) { \
450 const char* choices[] = __VA_ARGS__; \
451 options::parse_choices(option_name, arg, retval, \
452 choices, sizeof(choices) / sizeof(*choices)); \
455 // This is like DEFINE_bool, but VARNAME is the name of a different
456 // option. This option becomes an alias for that one. INVERT is true
457 // if this option is an inversion of the other one.
458 #define DEFINE_bool_alias(option__, varname__, dashes__, shortname__, \
459 helpstring__, no_helpstring__, invert__) \
461 struct Struct_##option__ : public options::Struct_var \
463 Struct_##option__() \
464 : option(#option__, dashes__, shortname__, "", helpstring__, \
469 parse_to_value(const char*, const char*, \
470 Command_line*, General_options* options) \
472 options->set_##varname__(!invert__); \
473 options->set_user_set_##varname__(); \
476 options::One_option option; \
478 Struct_##option__ option__##_; \
480 struct Struct_no_##option__ : public options::Struct_var \
482 Struct_no_##option__() \
483 : option((dashes__ == options::DASH_Z \
485 : "no-" #option__), \
486 dashes__, '\0', "", no_helpstring__, \
491 parse_to_value(const char*, const char*, \
492 Command_line*, General_options* options) \
494 options->set_##varname__(invert__); \
495 options->set_user_set_##varname__(); \
498 options::One_option option; \
500 Struct_no_##option__ no_##option__##_initializer_
502 // This is like DEFINE_uint64, but VARNAME is the name of a different
503 // option. This option becomes an alias for that one.
504 #define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \
505 helpstring__, helparg__) \
507 struct Struct_##option__ : public options::Struct_var \
509 Struct_##option__() \
510 : option(#option__, dashes__, shortname__, "", helpstring__, \
511 helparg__, false, this) \
515 parse_to_value(const char* option_name, const char* arg, \
516 Command_line*, General_options* options) \
519 options::parse_uint64(option_name, arg, &value); \
520 options->set_##varname__(value); \
521 options->set_user_set_##varname__(); \
524 options::One_option option; \
526 Struct_##option__ option__##_;
528 // This is used for non-standard flags. It defines no functions; it
529 // just calls General_options::parse_VARNAME whenever the flag is
530 // seen. We declare parse_VARNAME as a static member of
531 // General_options; you are responsible for defining it there.
532 // helparg__ should be NULL iff this special-option is a boolean.
533 #define DEFINE_special(varname__, dashes__, shortname__, \
534 helpstring__, helparg__) \
536 void parse_##varname__(const char* option, const char* arg, \
537 Command_line* inputs); \
538 struct Struct_##varname__ : public options::Struct_special \
540 Struct_##varname__() \
541 : options::Struct_special(#varname__, dashes__, shortname__, \
542 &General_options::parse_##varname__, \
543 helpstring__, helparg__) \
546 Struct_##varname__ varname__##_initializer_
548 // An option that takes an optional string argument. If the option is
549 // used with no argument, the value will be the default, and
550 // user_set_via_option will be true.
551 #define DEFINE_optional_string(varname__, dashes__, shortname__, \
553 helpstring__, helparg__) \
554 DEFINE_var(varname__, dashes__, shortname__, default_value__, \
555 default_value__, helpstring__, helparg__, true, \
556 const char*, const char*, options::parse_optional_string)
558 // A directory to search. For each directory we record whether it is
559 // in the sysroot. We need to know this so that, if a linker script
560 // is found within the sysroot, we will apply the sysroot to any files
561 // named by that script.
563 class Search_directory
566 // We need a default constructor because we put this in a
569 : name_(NULL
), put_in_sysroot_(false), is_in_sysroot_(false)
572 // This is the usual constructor.
573 Search_directory(const std::string
& name
, bool put_in_sysroot
)
574 : name_(name
), put_in_sysroot_(put_in_sysroot
), is_in_sysroot_(false)
576 if (this->name_
.empty())
580 // This is called if we have a sysroot. The sysroot is prefixed to
581 // any entries for which put_in_sysroot_ is true. is_in_sysroot_ is
582 // set to true for any enries which are in the sysroot (this will
583 // naturally include any entries for which put_in_sysroot_ is true).
584 // SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
585 // passing SYSROOT to lrealpath.
587 add_sysroot(const char* sysroot
, const char* canonical_sysroot
);
589 // Get the directory name.
592 { return this->name_
; }
594 // Return whether this directory is in the sysroot.
596 is_in_sysroot() const
597 { return this->is_in_sysroot_
; }
599 // Return whether this is considered a system directory.
601 is_system_directory() const
602 { return this->put_in_sysroot_
|| this->is_in_sysroot_
; }
605 // The directory name.
607 // True if the sysroot should be added as a prefix for this
608 // directory (if there is a sysroot). This is true for system
609 // directories that we search by default.
610 bool put_in_sysroot_
;
611 // True if this directory is in the sysroot (if there is a sysroot).
612 // This is true if there is a sysroot and either 1) put_in_sysroot_
613 // is true, or 2) the directory happens to be in the sysroot based
614 // on a pathname comparison.
618 class General_options
621 // NOTE: For every option that you add here, also consider if you
622 // should add it to Position_dependent_options.
623 DEFINE_special(help
, options::TWO_DASHES
, '\0',
624 N_("Report usage information"), NULL
);
625 DEFINE_special(version
, options::TWO_DASHES
, 'v',
626 N_("Report version information"), NULL
);
627 DEFINE_special(V
, options::EXACTLY_ONE_DASH
, '\0',
628 N_("Report version and target information"), NULL
);
630 // These options are sorted approximately so that for each letter in
631 // the alphabet, we show the option whose shortname is that letter
632 // (if any) and then every longname that starts with that letter (in
633 // alphabetical order). For both, lowercase sorts before uppercase.
634 // The -z options come last.
636 DEFINE_bool(add_needed
, options::TWO_DASHES
, '\0', false,
638 N_("Do not copy DT_NEEDED tags from shared libraries"));
640 DEFINE_bool_alias(allow_multiple_definition
, muldefs
, options::TWO_DASHES
,
641 '\0', N_("Allow multiple definitions of symbols"),
642 N_("Do not allow multiple definitions"), false);
644 DEFINE_bool(allow_shlib_undefined
, options::TWO_DASHES
, '\0', false,
645 N_("Allow unresolved references in shared libraries"),
646 N_("Do not allow unresolved references in shared libraries"));
648 DEFINE_bool(as_needed
, options::TWO_DASHES
, '\0', false,
649 N_("Only set DT_NEEDED for shared libraries if used"),
650 N_("Always DT_NEEDED for shared libraries"));
652 DEFINE_enum(assert, options::ONE_DASH
, '\0', NULL
,
653 N_("Ignored"), N_("[ignored]"),
654 {"definitions", "nodefinitions", "nosymbolic", "pure-text"});
656 // This should really be an "enum", but it's too easy for folks to
657 // forget to update the list as they add new targets. So we just
658 // accept any string. We'll fail later (when the string is parsed),
659 // if the target isn't actually supported.
660 DEFINE_string(format
, options::TWO_DASHES
, 'b', "elf",
661 N_("Set input format"), ("[elf,binary]"));
663 DEFINE_bool(Bdynamic
, options::ONE_DASH
, '\0', true,
664 N_("-l searches for shared libraries"), NULL
);
665 DEFINE_bool_alias(Bstatic
, Bdynamic
, options::ONE_DASH
, '\0',
666 N_("-l does not search for shared libraries"), NULL
,
668 DEFINE_bool_alias(dy
, Bdynamic
, options::ONE_DASH
, '\0',
669 N_("alias for -Bdynamic"), NULL
, false);
670 DEFINE_bool_alias(dn
, Bdynamic
, options::ONE_DASH
, '\0',
671 N_("alias for -Bstatic"), NULL
, true);
673 DEFINE_bool(Bgroup
, options::ONE_DASH
, '\0', false,
674 N_("Use group name lookup rules for shared library"), NULL
);
676 DEFINE_bool(Bsymbolic
, options::ONE_DASH
, '\0', false,
677 N_("Bind defined symbols locally"), NULL
);
679 DEFINE_bool(Bsymbolic_functions
, options::ONE_DASH
, '\0', false,
680 N_("Bind defined function symbols locally"), NULL
);
682 DEFINE_optional_string(build_id
, options::TWO_DASHES
, '\0', "tree",
683 N_("Generate build ID note"),
686 DEFINE_uint64(build_id_chunk_size_for_treehash
,
687 options::TWO_DASHES
, '\0', 2 << 20,
688 N_("Chunk size for '--build-id=tree'"), N_("SIZE"));
690 DEFINE_uint64(build_id_min_file_size_for_treehash
, options::TWO_DASHES
,
692 N_("Minimum output file size for '--build-id=tree' to work"
693 " differently than '--build-id=sha1'"), N_("SIZE"));
695 DEFINE_bool(check_sections
, options::TWO_DASHES
, '\0', true,
696 N_("Check segment addresses for overlaps (default)"),
697 N_("Do not check segment addresses for overlaps"));
700 DEFINE_enum(compress_debug_sections
, options::TWO_DASHES
, '\0', "none",
701 N_("Compress .debug_* sections in the output file"),
705 DEFINE_enum(compress_debug_sections
, options::TWO_DASHES
, '\0', "none",
706 N_("Compress .debug_* sections in the output file"),
711 DEFINE_bool(copy_dt_needed_entries
, options::TWO_DASHES
, '\0', false,
713 N_("Do not copy DT_NEEDED tags from shared libraries"));
715 DEFINE_bool(cref
, options::TWO_DASHES
, '\0', false,
716 N_("Output cross reference table"),
717 N_("Do not output cross reference table"));
719 DEFINE_bool(ctors_in_init_array
, options::TWO_DASHES
, '\0', true,
720 N_("Use DT_INIT_ARRAY for all constructors (default)"),
721 N_("Handle constructors as directed by compiler"));
723 DEFINE_bool(define_common
, options::TWO_DASHES
, 'd', false,
724 N_("Define common symbols"),
725 N_("Do not define common symbols"));
726 DEFINE_bool(dc
, options::ONE_DASH
, '\0', false,
727 N_("Alias for -d"), NULL
);
728 DEFINE_bool(dp
, options::ONE_DASH
, '\0', false,
729 N_("Alias for -d"), NULL
);
731 DEFINE_string(debug
, options::TWO_DASHES
, '\0', "",
732 N_("Turn on debugging"),
733 N_("[all,files,script,task][,...]"));
735 DEFINE_special(defsym
, options::TWO_DASHES
, '\0',
736 N_("Define a symbol"), N_("SYMBOL=EXPRESSION"));
738 DEFINE_optional_string(demangle
, options::TWO_DASHES
, '\0', NULL
,
739 N_("Demangle C++ symbols in log messages"),
742 DEFINE_bool(no_demangle
, options::TWO_DASHES
, '\0', false,
743 N_("Do not demangle C++ symbols in log messages"),
746 DEFINE_bool(detect_odr_violations
, options::TWO_DASHES
, '\0', false,
747 N_("Look for violations of the C++ One Definition Rule"),
748 N_("Do not look for violations of the C++ One Definition Rule"));
750 DEFINE_bool(discard_all
, options::TWO_DASHES
, 'x', false,
751 N_("Delete all local symbols"), NULL
);
752 DEFINE_bool(discard_locals
, options::TWO_DASHES
, 'X', false,
753 N_("Delete all temporary local symbols"), NULL
);
755 DEFINE_bool(dynamic_list_data
, options::TWO_DASHES
, '\0', false,
756 N_("Add data symbols to dynamic symbols"), NULL
);
758 DEFINE_bool(dynamic_list_cpp_new
, options::TWO_DASHES
, '\0', false,
759 N_("Add C++ operator new/delete to dynamic symbols"), NULL
);
761 DEFINE_bool(dynamic_list_cpp_typeinfo
, options::TWO_DASHES
, '\0', false,
762 N_("Add C++ typeinfo to dynamic symbols"), NULL
);
764 DEFINE_special(dynamic_list
, options::TWO_DASHES
, '\0',
765 N_("Read a list of dynamic symbols"), N_("FILE"));
767 DEFINE_string(entry
, options::TWO_DASHES
, 'e', NULL
,
768 N_("Set program start address"), N_("ADDRESS"));
770 DEFINE_special(exclude_libs
, options::TWO_DASHES
, '\0',
771 N_("Exclude libraries from automatic export"),
772 N_(("lib,lib ...")));
774 DEFINE_bool(export_dynamic
, options::TWO_DASHES
, 'E', false,
775 N_("Export all dynamic symbols"),
776 N_("Do not export all dynamic symbols (default)"));
778 DEFINE_set(export_dynamic_symbol
, options::TWO_DASHES
, '\0',
779 N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL"));
781 DEFINE_special(EB
, options::ONE_DASH
, '\0',
782 N_("Link big-endian objects."), NULL
);
784 DEFINE_special(EL
, options::ONE_DASH
, '\0',
785 N_("Link little-endian objects."), NULL
);
787 DEFINE_bool(eh_frame_hdr
, options::TWO_DASHES
, '\0', false,
788 N_("Create exception frame header"), NULL
);
790 DEFINE_bool(enum_size_warning
, options::TWO_DASHES
, '\0', true, NULL
,
791 N_("(ARM only) Do not warn about objects with incompatible "
794 DEFINE_set(auxiliary
, options::TWO_DASHES
, 'f',
795 N_("Auxiliary filter for shared object symbol table"),
798 DEFINE_string(filter
, options::TWO_DASHES
, 'F', NULL
,
799 N_("Filter for shared object symbol table"),
802 DEFINE_bool(fatal_warnings
, options::TWO_DASHES
, '\0', false,
803 N_("Treat warnings as errors"),
804 N_("Do not treat warnings as errors"));
806 DEFINE_string(fini
, options::ONE_DASH
, '\0', "_fini",
807 N_("Call SYMBOL at unload-time"), N_("SYMBOL"));
809 DEFINE_bool(fix_cortex_a8
, options::TWO_DASHES
, '\0', false,
810 N_("(ARM only) Fix binaries for Cortex-A8 erratum."),
811 N_("(ARM only) Do not fix binaries for Cortex-A8 erratum."));
813 DEFINE_bool(fix_arm1176
, options::TWO_DASHES
, '\0', true,
814 N_("(ARM only) Fix binaries for ARM1176 erratum."),
815 N_("(ARM only) Do not fix binaries for ARM1176 erratum."));
817 DEFINE_bool(merge_exidx_entries
, options::TWO_DASHES
, '\0', true,
818 N_("(ARM only) Merge exidx entries in debuginfo."),
819 N_("(ARM only) Do not merge exidx entries in debuginfo."));
821 DEFINE_special(fix_v4bx
, options::TWO_DASHES
, '\0',
822 N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"),
825 DEFINE_special(fix_v4bx_interworking
, options::TWO_DASHES
, '\0',
826 N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking "
830 DEFINE_bool(g
, options::EXACTLY_ONE_DASH
, '\0', false,
831 N_("Ignored"), NULL
);
833 DEFINE_bool(gdb_index
, options::TWO_DASHES
, '\0', false,
834 N_("Generate .gdb_index section"),
835 N_("Do not generate .gdb_index section"));
837 DEFINE_bool(gnu_unique
, options::TWO_DASHES
, '\0', true,
838 N_("Enable STB_GNU_UNIQUE symbol binding (default)"),
839 N_("Disable STB_GNU_UNIQUE symbol binding"));
841 DEFINE_string(soname
, options::ONE_DASH
, 'h', NULL
,
842 N_("Set shared library name"), N_("FILENAME"));
844 DEFINE_double(hash_bucket_empty_fraction
, options::TWO_DASHES
, '\0', 0.0,
845 N_("Min fraction of empty buckets in dynamic hash"),
848 DEFINE_enum(hash_style
, options::TWO_DASHES
, '\0', "sysv",
849 N_("Dynamic hash style"), N_("[sysv,gnu,both]"),
850 {"sysv", "gnu", "both"});
852 DEFINE_string(dynamic_linker
, options::TWO_DASHES
, 'I', NULL
,
853 N_("Set dynamic linker path"), N_("PROGRAM"));
855 DEFINE_special(incremental
, options::TWO_DASHES
, '\0',
856 N_("Do an incremental link if possible; "
857 "otherwise, do a full link and prepare output "
858 "for incremental linking"), NULL
);
860 DEFINE_special(no_incremental
, options::TWO_DASHES
, '\0',
861 N_("Do a full link (default)"), NULL
);
863 DEFINE_special(incremental_full
, options::TWO_DASHES
, '\0',
864 N_("Do a full link and "
865 "prepare output for incremental linking"), NULL
);
867 DEFINE_special(incremental_update
, options::TWO_DASHES
, '\0',
868 N_("Do an incremental link; exit if not possible"), NULL
);
870 DEFINE_string(incremental_base
, options::TWO_DASHES
, '\0', NULL
,
871 N_("Set base file for incremental linking"
872 " (default is output file)"),
875 DEFINE_special(incremental_changed
, options::TWO_DASHES
, '\0',
876 N_("Assume files changed"), NULL
);
878 DEFINE_special(incremental_unchanged
, options::TWO_DASHES
, '\0',
879 N_("Assume files didn't change"), NULL
);
881 DEFINE_special(incremental_unknown
, options::TWO_DASHES
, '\0',
882 N_("Use timestamps to check files (default)"), NULL
);
884 DEFINE_special(incremental_startup_unchanged
, options::TWO_DASHES
, '\0',
885 N_("Assume startup files unchanged "
886 "(files preceding this option)"), NULL
);
888 DEFINE_percent(incremental_patch
, options::TWO_DASHES
, '\0', 10,
889 N_("Amount of extra space to allocate for patches"),
892 DEFINE_string(init
, options::ONE_DASH
, '\0', "_init",
893 N_("Call SYMBOL at load-time"), N_("SYMBOL"));
895 DEFINE_special(just_symbols
, options::TWO_DASHES
, '\0',
896 N_("Read only symbol values from FILE"), N_("FILE"));
898 DEFINE_bool(map_whole_files
, options::TWO_DASHES
, '\0',
900 N_("Map whole files to memory (default on 64-bit hosts)"),
901 N_("Map relevant file parts to memory (default on 32-bit "
903 DEFINE_bool(keep_files_mapped
, options::TWO_DASHES
, '\0', true,
904 N_("Keep files mapped across passes (default)"),
905 N_("Release mapped files after each pass"));
907 DEFINE_bool(ld_generated_unwind_info
, options::TWO_DASHES
, '\0', true,
908 N_("Generate unwind information for PLT (default)"),
909 N_("Do not generate unwind information for PLT"));
911 DEFINE_special(library
, options::TWO_DASHES
, 'l',
912 N_("Search for library LIBNAME"), N_("LIBNAME"));
914 DEFINE_dirlist(library_path
, options::TWO_DASHES
, 'L',
915 N_("Add directory to search path"), N_("DIR"));
917 DEFINE_bool(text_reorder
, options::TWO_DASHES
, '\0', true,
918 N_("Enable text section reordering for GCC section names "
920 N_("Disable text section reordering for GCC section names"));
922 DEFINE_bool(nostdlib
, options::ONE_DASH
, '\0', false,
923 N_("Only search directories specified on the command line."),
926 DEFINE_bool(rosegment
, options::TWO_DASHES
, '\0', false,
927 N_("Put read-only non-executable sections in their own segment"),
930 DEFINE_string(m
, options::EXACTLY_ONE_DASH
, 'm', "",
931 N_("Set GNU linker emulation; obsolete"), N_("EMULATION"));
933 DEFINE_bool(mmap_output_file
, options::TWO_DASHES
, '\0', true,
934 N_("Map the output file for writing (default)."),
935 N_("Do not map the output file for writing."));
937 DEFINE_bool(print_map
, options::TWO_DASHES
, 'M', false,
938 N_("Write map file on standard output"), NULL
);
939 DEFINE_string(Map
, options::ONE_DASH
, '\0', NULL
, N_("Write map file"),
942 DEFINE_bool(nmagic
, options::TWO_DASHES
, 'n', false,
943 N_("Do not page align data"), NULL
);
944 DEFINE_bool(omagic
, options::EXACTLY_TWO_DASHES
, 'N', false,
945 N_("Do not page align data, do not make text readonly"),
946 N_("Page align data, make text readonly"));
948 DEFINE_enable(new_dtags
, options::EXACTLY_TWO_DASHES
, '\0', true,
949 N_("Enable use of DT_RUNPATH and DT_FLAGS"),
950 N_("Disable use of DT_RUNPATH and DT_FLAGS"));
952 DEFINE_bool(noinhibit_exec
, options::TWO_DASHES
, '\0', false,
953 N_("Create an output file even if errors occur"), NULL
);
955 DEFINE_bool_alias(no_undefined
, defs
, options::TWO_DASHES
, '\0',
956 N_("Report undefined symbols (even with --shared)"),
959 DEFINE_string(output
, options::TWO_DASHES
, 'o', "a.out",
960 N_("Set output file name"), N_("FILE"));
962 DEFINE_uint(optimize
, options::EXACTLY_ONE_DASH
, 'O', 0,
963 N_("Optimize output file size"), N_("LEVEL"));
965 DEFINE_string(oformat
, options::EXACTLY_TWO_DASHES
, '\0', "elf",
966 N_("Set output format"), N_("[binary]"));
968 DEFINE_bool(p
, options::ONE_DASH
, '\0', false,
969 N_("(ARM only) Ignore for backward compatibility"), NULL
);
971 DEFINE_bool(pie
, options::ONE_DASH
, '\0', false,
972 N_("Create a position independent executable"), NULL
);
973 DEFINE_bool_alias(pic_executable
, pie
, options::TWO_DASHES
, '\0',
974 N_("Create a position independent executable"), NULL
,
977 DEFINE_bool(pipeline_knowledge
, options::ONE_DASH
, '\0', false,
978 NULL
, N_("(ARM only) Ignore for backward compatibility"));
980 DEFINE_var(plt_align
, options::TWO_DASHES
, '\0', 0, "5",
981 N_("(PowerPC64 only) Align PLT call stubs to fit cache lines"),
982 N_("[=P2ALIGN]"), true, int, int, options::parse_uint
);
984 DEFINE_bool(plt_static_chain
, options::TWO_DASHES
, '\0', false,
985 N_("(PowerPC64 only) PLT call stubs should load r11"),
986 N_("(PowerPC64 only) PLT call stubs should not load r11"));
988 DEFINE_bool(plt_thread_safe
, options::TWO_DASHES
, '\0', false,
989 N_("(PowerPC64 only) PLT call stubs with load-load barrier"),
990 N_("(PowerPC64 only) PLT call stubs without barrier"));
992 #ifdef ENABLE_PLUGINS
993 DEFINE_special(plugin
, options::TWO_DASHES
, '\0',
994 N_("Load a plugin library"), N_("PLUGIN"));
995 DEFINE_special(plugin_opt
, options::TWO_DASHES
, '\0',
996 N_("Pass an option to the plugin"), N_("OPTION"));
999 DEFINE_bool(posix_fallocate
, options::TWO_DASHES
, '\0', true,
1000 N_("Use posix_fallocate to reserve space in the output file"
1002 N_("Use fallocate or ftruncate to reserve space."));
1004 DEFINE_bool(preread_archive_symbols
, options::TWO_DASHES
, '\0', false,
1005 N_("Preread archive symbols when multi-threaded"), NULL
);
1007 DEFINE_bool(print_output_format
, options::TWO_DASHES
, '\0', false,
1008 N_("Print default output format"), NULL
);
1010 DEFINE_string(print_symbol_counts
, options::TWO_DASHES
, '\0', NULL
,
1011 N_("Print symbols defined and used for each input"),
1014 DEFINE_bool(Qy
, options::EXACTLY_ONE_DASH
, '\0', false,
1015 N_("Ignored for SVR4 compatibility"), NULL
);
1017 DEFINE_bool(emit_relocs
, options::TWO_DASHES
, 'q', false,
1018 N_("Generate relocations in output"), NULL
);
1020 DEFINE_bool(relocatable
, options::EXACTLY_ONE_DASH
, 'r', false,
1021 N_("Generate relocatable output"), NULL
);
1022 DEFINE_bool_alias(i
, relocatable
, options::EXACTLY_ONE_DASH
, '\0',
1023 N_("Synonym for -r"), NULL
, false);
1025 DEFINE_bool(relax
, options::TWO_DASHES
, '\0', false,
1026 N_("Relax branches on certain targets"), NULL
);
1028 DEFINE_string(retain_symbols_file
, options::TWO_DASHES
, '\0', NULL
,
1029 N_("keep only symbols listed in this file"), N_("FILE"));
1031 // -R really means -rpath, but can mean --just-symbols for
1032 // compatibility with GNU ld. -rpath is always -rpath, so we list
1034 DEFINE_special(R
, options::EXACTLY_ONE_DASH
, 'R',
1035 N_("Add DIR to runtime search path"), N_("DIR"));
1037 DEFINE_dirlist(rpath
, options::ONE_DASH
, '\0',
1038 N_("Add DIR to runtime search path"), N_("DIR"));
1040 DEFINE_dirlist(rpath_link
, options::TWO_DASHES
, '\0',
1041 N_("Add DIR to link time shared library search path"),
1044 DEFINE_string(section_ordering_file
, options::TWO_DASHES
, '\0', NULL
,
1045 N_("Layout sections in the order specified."),
1048 DEFINE_special(section_start
, options::TWO_DASHES
, '\0',
1049 N_("Set address of section"), N_("SECTION=ADDRESS"));
1051 DEFINE_optional_string(sort_common
, options::TWO_DASHES
, '\0', NULL
,
1052 N_("Sort common symbols by alignment"),
1053 N_("[={ascending,descending}]"));
1055 DEFINE_uint(spare_dynamic_tags
, options::TWO_DASHES
, '\0', 5,
1056 N_("Dynamic tag slots to reserve (default 5)"),
1059 DEFINE_bool(strip_all
, options::TWO_DASHES
, 's', false,
1060 N_("Strip all symbols"), NULL
);
1061 DEFINE_bool(strip_debug
, options::TWO_DASHES
, 'S', false,
1062 N_("Strip debugging information"), NULL
);
1063 DEFINE_bool(strip_debug_non_line
, options::TWO_DASHES
, '\0', false,
1064 N_("Emit only debug line number information"), NULL
);
1065 DEFINE_bool(strip_debug_gdb
, options::TWO_DASHES
, '\0', false,
1066 N_("Strip debug symbols that are unused by gdb "
1067 "(at least versions <= 7.4)"), NULL
);
1068 DEFINE_bool(strip_lto_sections
, options::TWO_DASHES
, '\0', true,
1069 N_("Strip LTO intermediate code sections"), NULL
);
1071 DEFINE_int(stub_group_size
, options::TWO_DASHES
, '\0', 1,
1072 N_("(ARM, PowerPC only) The maximum distance from instructions "
1073 "in a group of sections to their stubs. Negative values mean "
1074 "stubs are always after (PowerPC before) the group. 1 means "
1075 "use default size.\n"),
1078 DEFINE_bool(no_keep_memory
, options::TWO_DASHES
, '\0', false,
1079 N_("Use less memory and more disk I/O "
1080 "(included only for compatibility with GNU ld)"), NULL
);
1082 DEFINE_bool(shared
, options::ONE_DASH
, 'G', false,
1083 N_("Generate shared library"), NULL
);
1085 DEFINE_bool(Bshareable
, options::ONE_DASH
, '\0', false,
1086 N_("Generate shared library"), NULL
);
1088 DEFINE_uint(split_stack_adjust_size
, options::TWO_DASHES
, '\0', 0x4000,
1089 N_("Stack size when -fsplit-stack function calls non-split"),
1092 // This is not actually special in any way, but I need to give it
1093 // a non-standard accessor-function name because 'static' is a keyword.
1094 DEFINE_special(static, options::ONE_DASH
, '\0',
1095 N_("Do not link against shared libraries"), NULL
);
1097 DEFINE_enum(icf
, options::TWO_DASHES
, '\0', "none",
1098 N_("Identical Code Folding. "
1099 "\'--icf=safe\' Folds ctors, dtors and functions whose"
1100 " pointers are definitely not taken."),
1101 ("[none,all,safe]"),
1102 {"none", "all", "safe"});
1104 DEFINE_uint(icf_iterations
, options::TWO_DASHES
, '\0', 0,
1105 N_("Number of iterations of ICF (default 2)"), N_("COUNT"));
1107 DEFINE_bool(print_icf_sections
, options::TWO_DASHES
, '\0', false,
1108 N_("List folded identical sections on stderr"),
1109 N_("Do not list folded identical sections"));
1111 DEFINE_set(keep_unique
, options::TWO_DASHES
, '\0',
1112 N_("Do not fold this symbol during ICF"), N_("SYMBOL"));
1114 DEFINE_bool(gc_sections
, options::TWO_DASHES
, '\0', false,
1115 N_("Remove unused sections"),
1116 N_("Don't remove unused sections (default)"));
1118 DEFINE_bool(print_gc_sections
, options::TWO_DASHES
, '\0', false,
1119 N_("List removed unused sections on stderr"),
1120 N_("Do not list removed unused sections"));
1122 DEFINE_bool(stats
, options::TWO_DASHES
, '\0', false,
1123 N_("Print resource usage statistics"), NULL
);
1125 DEFINE_string(sysroot
, options::TWO_DASHES
, '\0', "",
1126 N_("Set target system root directory"), N_("DIR"));
1128 DEFINE_bool(trace
, options::TWO_DASHES
, 't', false,
1129 N_("Print the name of each input file"), NULL
);
1131 DEFINE_special(script
, options::TWO_DASHES
, 'T',
1132 N_("Read linker script"), N_("FILE"));
1134 DEFINE_bool(threads
, options::TWO_DASHES
, '\0', false,
1135 N_("Run the linker multi-threaded"),
1136 N_("Do not run the linker multi-threaded"));
1137 DEFINE_uint(thread_count
, options::TWO_DASHES
, '\0', 0,
1138 N_("Number of threads to use"), N_("COUNT"));
1139 DEFINE_uint(thread_count_initial
, options::TWO_DASHES
, '\0', 0,
1140 N_("Number of threads to use in initial pass"), N_("COUNT"));
1141 DEFINE_uint(thread_count_middle
, options::TWO_DASHES
, '\0', 0,
1142 N_("Number of threads to use in middle pass"), N_("COUNT"));
1143 DEFINE_uint(thread_count_final
, options::TWO_DASHES
, '\0', 0,
1144 N_("Number of threads to use in final pass"), N_("COUNT"));
1146 DEFINE_uint64(Tbss
, options::ONE_DASH
, '\0', -1U,
1147 N_("Set the address of the bss segment"), N_("ADDRESS"));
1148 DEFINE_uint64(Tdata
, options::ONE_DASH
, '\0', -1U,
1149 N_("Set the address of the data segment"), N_("ADDRESS"));
1150 DEFINE_uint64(Ttext
, options::ONE_DASH
, '\0', -1U,
1151 N_("Set the address of the text segment"), N_("ADDRESS"));
1152 DEFINE_uint64_alias(Ttext_segment
, Ttext
, options::ONE_DASH
, '\0',
1153 N_("Set the address of the text segment"),
1156 DEFINE_bool(toc_optimize
, options::TWO_DASHES
, '\0', true,
1157 N_("(PowerPC64 only) Optimize TOC code sequences"),
1158 N_("(PowerPC64 only) Don't optimize TOC code sequences"));
1160 DEFINE_bool(toc_sort
, options::TWO_DASHES
, '\0', true,
1161 N_("(PowerPC64 only) Sort TOC and GOT sections"),
1162 N_("(PowerPC64 only) Don't sort TOC and GOT sections"));
1164 DEFINE_set(undefined
, options::TWO_DASHES
, 'u',
1165 N_("Create undefined reference to SYMBOL"), N_("SYMBOL"));
1167 DEFINE_enum(unresolved_symbols
, options::TWO_DASHES
, '\0', NULL
,
1168 N_("How to handle unresolved symbols"),
1169 ("ignore-all,report-all,ignore-in-object-files,"
1170 "ignore-in-shared-libs"),
1171 {"ignore-all", "report-all", "ignore-in-object-files",
1172 "ignore-in-shared-libs"});
1174 DEFINE_bool(verbose
, options::TWO_DASHES
, '\0', false,
1175 N_("Synonym for --debug=files"), NULL
);
1177 DEFINE_special(version_script
, options::TWO_DASHES
, '\0',
1178 N_("Read version script"), N_("FILE"));
1180 DEFINE_bool(warn_common
, options::TWO_DASHES
, '\0', false,
1181 N_("Warn about duplicate common symbols"),
1182 N_("Do not warn about duplicate common symbols (default)"));
1184 DEFINE_bool(warn_constructors
, options::TWO_DASHES
, '\0', false,
1185 N_("Ignored"), N_("Ignored"));
1187 DEFINE_bool(warn_execstack
, options::TWO_DASHES
, '\0', false,
1188 N_("Warn if the stack is executable"),
1189 N_("Do not warn if the stack is executable (default)"));
1191 DEFINE_bool(warn_mismatch
, options::TWO_DASHES
, '\0', true,
1192 NULL
, N_("Don't warn about mismatched input files"));
1194 DEFINE_bool(warn_multiple_gp
, options::TWO_DASHES
, '\0', false,
1195 N_("Ignored"), NULL
);
1197 DEFINE_bool(warn_search_mismatch
, options::TWO_DASHES
, '\0', true,
1198 N_("Warn when skipping an incompatible library"),
1199 N_("Don't warn when skipping an incompatible library"));
1201 DEFINE_bool(warn_shared_textrel
, options::TWO_DASHES
, '\0', false,
1202 N_("Warn if text segment is not shareable"),
1203 N_("Do not warn if text segment is not shareable (default)"));
1205 DEFINE_bool(warn_unresolved_symbols
, options::TWO_DASHES
, '\0', false,
1206 N_("Report unresolved symbols as warnings"),
1208 DEFINE_bool_alias(error_unresolved_symbols
, warn_unresolved_symbols
,
1209 options::TWO_DASHES
, '\0',
1210 N_("Report unresolved symbols as errors"),
1213 DEFINE_bool(wchar_size_warning
, options::TWO_DASHES
, '\0', true, NULL
,
1214 N_("(ARM only) Do not warn about objects with incompatible "
1217 DEFINE_bool(whole_archive
, options::TWO_DASHES
, '\0', false,
1218 N_("Include all archive contents"),
1219 N_("Include only needed archive contents"));
1221 DEFINE_set(wrap
, options::TWO_DASHES
, '\0',
1222 N_("Use wrapper functions for SYMBOL"), N_("SYMBOL"));
1224 DEFINE_set(trace_symbol
, options::TWO_DASHES
, 'y',
1225 N_("Trace references to symbol"), N_("SYMBOL"));
1227 DEFINE_bool(undefined_version
, options::TWO_DASHES
, '\0', true,
1228 N_("Allow unused version in script (default)"),
1229 N_("Do not allow unused version in script"));
1231 DEFINE_string(Y
, options::EXACTLY_ONE_DASH
, 'Y', "",
1232 N_("Default search path for Solaris compatibility"),
1235 DEFINE_special(start_group
, options::TWO_DASHES
, '(',
1236 N_("Start a library search group"), NULL
);
1237 DEFINE_special(end_group
, options::TWO_DASHES
, ')',
1238 N_("End a library search group"), NULL
);
1241 DEFINE_special(start_lib
, options::TWO_DASHES
, '\0',
1242 N_("Start a library"), NULL
);
1243 DEFINE_special(end_lib
, options::TWO_DASHES
, '\0',
1244 N_("End a library "), NULL
);
1246 DEFINE_string(fuse_ld
, options::ONE_DASH
, '\0', "",
1247 N_("Ignored for GCC linker option compatibility"),
1252 DEFINE_bool(combreloc
, options::DASH_Z
, '\0', true,
1253 N_("Sort dynamic relocs"),
1254 N_("Do not sort dynamic relocs"));
1255 DEFINE_uint64(common_page_size
, options::DASH_Z
, '\0', 0,
1256 N_("Set common page size to SIZE"), N_("SIZE"));
1257 DEFINE_bool(defs
, options::DASH_Z
, '\0', false,
1258 N_("Report undefined symbols (even with --shared)"),
1260 DEFINE_bool(execstack
, options::DASH_Z
, '\0', false,
1261 N_("Mark output as requiring executable stack"), NULL
);
1262 DEFINE_bool(initfirst
, options::DASH_Z
, '\0', false,
1263 N_("Mark DSO to be initialized first at runtime"),
1265 DEFINE_bool(interpose
, options::DASH_Z
, '\0', false,
1266 N_("Mark object to interpose all DSOs but executable"),
1268 DEFINE_bool_alias(lazy
, now
, options::DASH_Z
, '\0',
1269 N_("Mark object for lazy runtime binding (default)"),
1271 DEFINE_bool(loadfltr
, options::DASH_Z
, '\0', false,
1272 N_("Mark object requiring immediate process"),
1274 DEFINE_uint64(max_page_size
, options::DASH_Z
, '\0', 0,
1275 N_("Set maximum page size to SIZE"), N_("SIZE"));
1276 DEFINE_bool(muldefs
, options::DASH_Z
, '\0', false,
1277 N_("Allow multiple definitions of symbols"),
1279 // copyreloc is here in the list because there is only -z
1280 // nocopyreloc, not -z copyreloc.
1281 DEFINE_bool(copyreloc
, options::DASH_Z
, '\0', true,
1283 N_("Do not create copy relocs"));
1284 DEFINE_bool(nodefaultlib
, options::DASH_Z
, '\0', false,
1285 N_("Mark object not to use default search paths"),
1287 DEFINE_bool(nodelete
, options::DASH_Z
, '\0', false,
1288 N_("Mark DSO non-deletable at runtime"),
1290 DEFINE_bool(nodlopen
, options::DASH_Z
, '\0', false,
1291 N_("Mark DSO not available to dlopen"),
1293 DEFINE_bool(nodump
, options::DASH_Z
, '\0', false,
1294 N_("Mark DSO not available to dldump"),
1296 DEFINE_bool(noexecstack
, options::DASH_Z
, '\0', false,
1297 N_("Mark output as not requiring executable stack"), NULL
);
1298 DEFINE_bool(now
, options::DASH_Z
, '\0', false,
1299 N_("Mark object for immediate function binding"),
1301 DEFINE_bool(origin
, options::DASH_Z
, '\0', false,
1302 N_("Mark DSO to indicate that needs immediate $ORIGIN "
1303 "processing at runtime"), NULL
);
1304 DEFINE_bool(relro
, options::DASH_Z
, '\0', false,
1305 N_("Where possible mark variables read-only after relocation"),
1306 N_("Don't mark variables read-only after relocation"));
1307 DEFINE_bool(text
, options::DASH_Z
, '\0', false,
1308 N_("Do not permit relocations in read-only segments"),
1309 N_("Permit relocations in read-only segments (default)"));
1310 DEFINE_bool_alias(textoff
, text
, options::DASH_Z
, '\0',
1311 N_("Permit relocations in read-only segments (default)"),
1315 typedef options::Dir_list Dir_list
;
1319 // Does post-processing on flags, making sure they all have
1320 // non-conflicting values. Also converts some flags from their
1321 // "standard" types (string, etc), to another type (enum, DirList),
1322 // which can be accessed via a separate method. Dies if it notices
1326 // True if we printed the version information.
1328 printed_version() const
1329 { return this->printed_version_
; }
1331 // The macro defines output() (based on --output), but that's a
1332 // generic name. Provide this alternative name, which is clearer.
1334 output_file_name() const
1335 { return this->output(); }
1337 // This is not defined via a flag, but combines flags to say whether
1338 // the output is position-independent or not.
1340 output_is_position_independent() const
1341 { return this->shared() || this->pie(); }
1343 // Return true if the output is something that can be exec()ed, such
1344 // as a static executable, or a position-dependent or
1345 // position-independent executable, but not a dynamic library or an
1348 output_is_executable() const
1349 { return !this->shared() && !this->relocatable(); }
1351 // This would normally be static(), and defined automatically, but
1352 // since static is a keyword, we need to come up with our own name.
1357 // In addition to getting the input and output formats as a string
1358 // (via format() and oformat()), we also give access as an enum.
1363 // Straight binary format.
1364 OBJECT_FORMAT_BINARY
1367 // Convert a string to an Object_format. Gives an error if the
1368 // string is not recognized.
1369 static Object_format
1370 string_to_object_format(const char* arg
);
1372 // Note: these functions are not very fast.
1373 Object_format
format_enum() const;
1374 Object_format
oformat_enum() const;
1376 // Return whether FILENAME is in a system directory.
1378 is_in_system_directory(const std::string
& name
) const;
1380 // RETURN whether SYMBOL_NAME should be kept, according to symbols_to_retain_.
1382 should_retain_symbol(const char* symbol_name
) const
1384 if (symbols_to_retain_
.empty()) // means flag wasn't specified
1386 return symbols_to_retain_
.find(symbol_name
) != symbols_to_retain_
.end();
1389 // These are the best way to get access to the execstack state,
1390 // not execstack() and noexecstack() which are hard to use properly.
1392 is_execstack_set() const
1393 { return this->execstack_status_
!= EXECSTACK_FROM_INPUT
; }
1396 is_stack_executable() const
1397 { return this->execstack_status_
== EXECSTACK_YES
; }
1401 { return this->icf_status_
!= ICF_NONE
; }
1404 icf_safe_folding() const
1405 { return this->icf_status_
== ICF_SAFE
; }
1407 // The --demangle option takes an optional string, and there is also
1408 // a --no-demangle option. This is the best way to decide whether
1409 // to demangle or not.
1412 { return this->do_demangle_
; }
1414 // Returns TRUE if any plugin libraries have been loaded.
1417 { return this->plugins_
!= NULL
; }
1419 // Return a pointer to the plugin manager.
1422 { return this->plugins_
; }
1424 // True iff SYMBOL was found in the file specified by dynamic-list.
1426 in_dynamic_list(const char* symbol
) const
1427 { return this->dynamic_list_
.version_script_info()->symbol_is_local(symbol
); }
1429 // Finalize the dynamic list.
1431 finalize_dynamic_list()
1432 { this->dynamic_list_
.version_script_info()->finalize(); }
1434 // The mode selected by the --incremental options.
1435 enum Incremental_mode
1437 // No incremental linking (--no-incremental).
1439 // Incremental update only (--incremental-update).
1441 // Force a full link, but prepare for subsequent incremental link
1442 // (--incremental-full).
1444 // Incremental update if possible, fallback to full link (--incremental).
1448 // The incremental linking mode.
1450 incremental_mode() const
1451 { return this->incremental_mode_
; }
1453 // The disposition given by the --incremental-changed,
1454 // --incremental-unchanged or --incremental-unknown option. The
1455 // value may change as we proceed parsing the command line flags.
1456 Incremental_disposition
1457 incremental_disposition() const
1458 { return this->incremental_disposition_
; }
1460 // The disposition to use for startup files (those that precede the
1461 // first --incremental-changed, etc. option).
1462 Incremental_disposition
1463 incremental_startup_disposition() const
1464 { return this->incremental_startup_disposition_
; }
1466 // Return true if S is the name of a library excluded from automatic
1469 check_excluded_libs(const std::string
&s
) const;
1471 // If an explicit start address was given for section SECNAME with
1472 // the --section-start option, return true and set *PADDR to the
1473 // address. Otherwise return false.
1475 section_start(const char* secname
, uint64_t* paddr
) const;
1477 // Return whether any --section-start option was used.
1479 any_section_start() const
1480 { return !this->section_starts_
.empty(); }
1484 // Leave original instruction.
1486 // Replace instruction.
1488 // Generate an interworking veneer.
1489 FIX_V4BX_INTERWORKING
1494 { return (this->fix_v4bx_
); }
1505 { return this->endianness_
; }
1508 // Don't copy this structure.
1509 General_options(const General_options
&);
1510 General_options
& operator=(const General_options
&);
1512 // Whether to mark the stack as executable.
1515 // Not set on command line.
1516 EXECSTACK_FROM_INPUT
,
1517 // Mark the stack as executable (-z execstack).
1519 // Mark the stack as not executable (-z noexecstack).
1525 // Do not fold any functions (Default or --icf=none).
1527 // All functions are candidates for folding. (--icf=all).
1529 // Only ctors and dtors are candidates for folding. (--icf=safe).
1534 set_icf_status(Icf_status value
)
1535 { this->icf_status_
= value
; }
1538 set_execstack_status(Execstack value
)
1539 { this->execstack_status_
= value
; }
1542 set_do_demangle(bool value
)
1543 { this->do_demangle_
= value
; }
1546 set_static(bool value
)
1547 { static_
= value
; }
1549 // These are called by finalize() to set up the search-path correctly.
1551 add_to_library_path_with_sysroot(const std::string
& arg
)
1552 { this->add_search_directory_to_library_path(Search_directory(arg
, true)); }
1554 // Apply any sysroot to the directory lists.
1558 // Add a plugin and its arguments to the list of plugins.
1560 add_plugin(const char* filename
);
1562 // Add a plugin option.
1564 add_plugin_option(const char* opt
);
1566 // Whether we printed version information.
1567 bool printed_version_
;
1568 // Whether to mark the stack as executable.
1569 Execstack execstack_status_
;
1570 // Whether to do code folding.
1571 Icf_status icf_status_
;
1572 // Whether to do a static link.
1574 // Whether to do demangling.
1576 // List of plugin libraries.
1577 Plugin_manager
* plugins_
;
1578 // The parsed output of --dynamic-list files. For convenience in
1579 // script.cc, we store this as a Script_options object, even though
1580 // we only use a single Version_tree from it.
1581 Script_options dynamic_list_
;
1582 // The incremental linking mode.
1583 Incremental_mode incremental_mode_
;
1584 // The disposition given by the --incremental-changed,
1585 // --incremental-unchanged or --incremental-unknown option. The
1586 // value may change as we proceed parsing the command line flags.
1587 Incremental_disposition incremental_disposition_
;
1588 // The disposition to use for startup files (those marked
1589 // INCREMENTAL_STARTUP).
1590 Incremental_disposition incremental_startup_disposition_
;
1591 // Whether we have seen one of the options that require incremental
1592 // build (--incremental-changed, --incremental-unchanged,
1593 // --incremental-unknown, or --incremental-startup-unchanged).
1594 bool implicit_incremental_
;
1595 // Libraries excluded from automatic export, via --exclude-libs.
1596 Unordered_set
<std::string
> excluded_libs_
;
1597 // List of symbol-names to keep, via -retain-symbol-info.
1598 Unordered_set
<std::string
> symbols_to_retain_
;
1599 // Map from section name to address from --section-start.
1600 std::map
<std::string
, uint64_t> section_starts_
;
1601 // Whether to process armv4 bx instruction relocation.
1604 Endianness endianness_
;
1607 // The position-dependent options. We use this to store the state of
1608 // the commandline at a particular point in parsing for later
1609 // reference. For instance, if we see "ld --whole-archive foo.a
1610 // --no-whole-archive," we want to store the whole-archive option with
1611 // foo.a, so when the time comes to parse foo.a we know we should do
1612 // it in whole-archive mode. We could store all of General_options,
1613 // but that's big, so we just pick the subset of flags that actually
1614 // change in a position-dependent way.
1616 #define DEFINE_posdep(varname__, type__) \
1620 { return this->varname__##_; } \
1623 set_##varname__(type__ value) \
1624 { this->varname__##_ = value; } \
1628 class Position_dependent_options
1631 Position_dependent_options(const General_options
& options
1632 = Position_dependent_options::default_options_
)
1633 { copy_from_options(options
); }
1635 void copy_from_options(const General_options
& options
)
1637 this->set_as_needed(options
.as_needed());
1638 this->set_Bdynamic(options
.Bdynamic());
1639 this->set_format_enum(options
.format_enum());
1640 this->set_whole_archive(options
.whole_archive());
1641 this->set_incremental_disposition(options
.incremental_disposition());
1644 DEFINE_posdep(as_needed
, bool);
1645 DEFINE_posdep(Bdynamic
, bool);
1646 DEFINE_posdep(format_enum
, General_options::Object_format
);
1647 DEFINE_posdep(whole_archive
, bool);
1648 DEFINE_posdep(incremental_disposition
, Incremental_disposition
);
1651 // This is a General_options with everything set to its default
1652 // value. A Position_dependent_options created with no argument
1653 // will take its values from here.
1654 static General_options default_options_
;
1658 // A single file or library argument from the command line.
1660 class Input_file_argument
1663 enum Input_file_type
1665 // A regular file, name used as-is, not searched.
1666 INPUT_FILE_TYPE_FILE
,
1667 // A library name. When used, "lib" will be prepended and ".so" or
1668 // ".a" appended to make a filename, and that filename will be searched
1669 // for using the -L paths.
1670 INPUT_FILE_TYPE_LIBRARY
,
1671 // A regular file, name used as-is, but searched using the -L paths.
1672 INPUT_FILE_TYPE_SEARCHED_FILE
1675 // name: file name or library name
1676 // type: the type of this input file.
1677 // extra_search_path: an extra directory to look for the file, prior
1678 // to checking the normal library search path. If this is "",
1679 // then no extra directory is added.
1680 // just_symbols: whether this file only defines symbols.
1681 // options: The position dependent options at this point in the
1682 // command line, such as --whole-archive.
1683 Input_file_argument()
1684 : name_(), type_(INPUT_FILE_TYPE_FILE
), extra_search_path_(""),
1685 just_symbols_(false), options_(), arg_serial_(0)
1688 Input_file_argument(const char* name
, Input_file_type type
,
1689 const char* extra_search_path
,
1691 const Position_dependent_options
& options
)
1692 : name_(name
), type_(type
), extra_search_path_(extra_search_path
),
1693 just_symbols_(just_symbols
), options_(options
), arg_serial_(0)
1696 // You can also pass in a General_options instance instead of a
1697 // Position_dependent_options. In that case, we extract the
1698 // position-independent vars from the General_options and only store
1700 Input_file_argument(const char* name
, Input_file_type type
,
1701 const char* extra_search_path
,
1703 const General_options
& options
)
1704 : name_(name
), type_(type
), extra_search_path_(extra_search_path
),
1705 just_symbols_(just_symbols
), options_(options
), arg_serial_(0)
1710 { return this->name_
.c_str(); }
1712 const Position_dependent_options
&
1714 { return this->options_
; }
1718 { return type_
== INPUT_FILE_TYPE_LIBRARY
; }
1721 is_searched_file() const
1722 { return type_
== INPUT_FILE_TYPE_SEARCHED_FILE
; }
1725 extra_search_path() const
1727 return (this->extra_search_path_
.empty()
1729 : this->extra_search_path_
.c_str());
1732 // Return whether we should only read symbols from this file.
1734 just_symbols() const
1735 { return this->just_symbols_
; }
1737 // Return whether this file may require a search using the -L
1740 may_need_search() const
1742 return (this->is_lib()
1743 || this->is_searched_file()
1744 || !this->extra_search_path_
.empty());
1747 // Set the serial number for this argument.
1749 set_arg_serial(unsigned int arg_serial
)
1750 { this->arg_serial_
= arg_serial
; }
1752 // Get the serial number.
1755 { return this->arg_serial_
; }
1758 // We use std::string, not const char*, here for convenience when
1759 // using script files, so that we do not have to preserve the string
1762 Input_file_type type_
;
1763 std::string extra_search_path_
;
1765 Position_dependent_options options_
;
1766 // A unique index for this file argument in the argument list.
1767 unsigned int arg_serial_
;
1770 // A file or library, or a group, from the command line.
1772 class Input_argument
1775 // Create a file or library argument.
1776 explicit Input_argument(Input_file_argument file
)
1777 : is_file_(true), file_(file
), group_(NULL
), lib_(NULL
), script_info_(NULL
)
1780 // Create a group argument.
1781 explicit Input_argument(Input_file_group
* group
)
1782 : is_file_(false), group_(group
), lib_(NULL
), script_info_(NULL
)
1785 // Create a lib argument.
1786 explicit Input_argument(Input_file_lib
* lib
)
1787 : is_file_(false), group_(NULL
), lib_(lib
), script_info_(NULL
)
1790 // Return whether this is a file.
1793 { return this->is_file_
; }
1795 // Return whether this is a group.
1798 { return !this->is_file_
&& this->lib_
== NULL
; }
1800 // Return whether this is a lib.
1803 { return this->lib_
!= NULL
; }
1805 // Return the information about the file.
1806 const Input_file_argument
&
1809 gold_assert(this->is_file_
);
1813 // Return the information about the group.
1814 const Input_file_group
*
1817 gold_assert(!this->is_file_
);
1818 return this->group_
;
1824 gold_assert(!this->is_file_
);
1825 return this->group_
;
1828 // Return the information about the lib.
1829 const Input_file_lib
*
1832 gold_assert(!this->is_file_
);
1833 gold_assert(this->lib_
);
1840 gold_assert(!this->is_file_
);
1841 gold_assert(this->lib_
);
1845 // If a script generated this argument, store a pointer to the script info.
1846 // Currently used only for recording incremental link information.
1848 set_script_info(Script_info
* info
)
1849 { this->script_info_
= info
; }
1853 { return this->script_info_
; }
1857 Input_file_argument file_
;
1858 Input_file_group
* group_
;
1859 Input_file_lib
* lib_
;
1860 Script_info
* script_info_
;
1863 typedef std::vector
<Input_argument
> Input_argument_list
;
1865 // A group from the command line. This is a set of arguments within
1866 // --start-group ... --end-group.
1868 class Input_file_group
1871 typedef Input_argument_list::const_iterator const_iterator
;
1877 // Add a file to the end of the group.
1879 add_file(const Input_file_argument
& arg
)
1881 this->files_
.push_back(Input_argument(arg
));
1882 return this->files_
.back();
1885 // Iterators to iterate over the group contents.
1889 { return this->files_
.begin(); }
1893 { return this->files_
.end(); }
1896 Input_argument_list files_
;
1899 // A lib from the command line. This is a set of arguments within
1900 // --start-lib ... --end-lib.
1902 class Input_file_lib
1905 typedef Input_argument_list::const_iterator const_iterator
;
1907 Input_file_lib(const Position_dependent_options
& options
)
1908 : files_(), options_(options
)
1911 // Add a file to the end of the lib.
1913 add_file(const Input_file_argument
& arg
)
1915 this->files_
.push_back(Input_argument(arg
));
1916 return this->files_
.back();
1919 const Position_dependent_options
&
1921 { return this->options_
; }
1923 // Iterators to iterate over the lib contents.
1927 { return this->files_
.begin(); }
1931 { return this->files_
.end(); }
1935 { return this->files_
.size(); }
1938 Input_argument_list files_
;
1939 Position_dependent_options options_
;
1942 // A list of files from the command line or a script.
1944 class Input_arguments
1947 typedef Input_argument_list::const_iterator const_iterator
;
1950 : input_argument_list_(), in_group_(false), in_lib_(false), file_count_(0)
1955 add_file(Input_file_argument
& arg
);
1957 // Start a group (the --start-group option).
1961 // End a group (the --end-group option).
1965 // Start a lib (the --start-lib option).
1967 start_lib(const Position_dependent_options
&);
1969 // End a lib (the --end-lib option).
1973 // Return whether we are currently in a group.
1976 { return this->in_group_
; }
1978 // Return whether we are currently in a lib.
1981 { return this->in_lib_
; }
1983 // The number of entries in the list.
1986 { return this->input_argument_list_
.size(); }
1988 // Iterators to iterate over the list of input files.
1992 { return this->input_argument_list_
.begin(); }
1996 { return this->input_argument_list_
.end(); }
1998 // Return whether the list is empty.
2001 { return this->input_argument_list_
.empty(); }
2003 // Return the number of input files. This may be larger than
2004 // input_argument_list_.size(), because of files that are part
2005 // of groups or libs.
2007 number_of_input_files() const
2008 { return this->file_count_
; }
2011 Input_argument_list input_argument_list_
;
2014 unsigned int file_count_
;
2018 // All the information read from the command line. These are held in
2019 // three separate structs: one to hold the options (--foo), one to
2020 // hold the filenames listed on the commandline, and one to hold
2021 // linker script information. This third is not a subset of the other
2022 // two because linker scripts can be specified either as options (via
2023 // -T) or as a file.
2028 typedef Input_arguments::const_iterator const_iterator
;
2032 // Process the command line options. This will exit with an
2033 // appropriate error message if an unrecognized option is seen.
2035 process(int argc
, const char** argv
);
2037 // Process one command-line option. This takes the index of argv to
2038 // process, and returns the index for the next option. no_more_options
2039 // is set to true if argv[i] is "--".
2041 process_one_option(int argc
, const char** argv
, int i
,
2042 bool* no_more_options
);
2044 // Get the general options.
2045 const General_options
&
2047 { return this->options_
; }
2049 // Get the position dependent options.
2050 const Position_dependent_options
&
2051 position_dependent_options() const
2052 { return this->position_options_
; }
2054 // Get the linker-script options.
2057 { return this->script_options_
; }
2059 // Finalize the version-script options and return them.
2060 const Version_script_info
&
2063 // Get the input files.
2066 { return this->inputs_
; }
2068 // The number of input files.
2070 number_of_input_files() const
2071 { return this->inputs_
.number_of_input_files(); }
2073 // Iterators to iterate over the list of input files.
2077 { return this->inputs_
.begin(); }
2081 { return this->inputs_
.end(); }
2084 Command_line(const Command_line
&);
2085 Command_line
& operator=(const Command_line
&);
2087 // This is a dummy class to provide a constructor that runs before
2088 // the constructor for the General_options. The Pre_options constructor
2089 // is used as a hook to set the flag enabling the options to register
2091 struct Pre_options
{
2095 // This must come before options_!
2096 Pre_options pre_options_
;
2097 General_options options_
;
2098 Position_dependent_options position_options_
;
2099 Script_options script_options_
;
2100 Input_arguments inputs_
;
2103 } // End namespace gold.
2105 #endif // !defined(GOLD_OPTIONS_H)