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options.h
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// options.h -- handle command line options for gold -*- C++ -*-
// Copyright (C) 2006-2019 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <[email protected]>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// General_options (from Command_line::options())
// All the options (a.k.a. command-line flags)
// Input_argument (from Command_line::inputs())
// The list of input files, including -l options.
// Command_line
// Everything we get from the command line -- the General_options
// plus the Input_arguments.
//
// There are also some smaller classes, such as
// Position_dependent_options which hold a subset of General_options
// that change as options are parsed (as opposed to the usual behavior
// of the last instance of that option specified on the commandline wins).
#ifndef GOLD_OPTIONS_H
#define GOLD_OPTIONS_H
#include <cstdlib>
#include <cstring>
#include <list>
#include <map>
#include <string>
#include <vector>
#include "elfcpp.h"
#include "script.h"
namespace gold
{
class Command_line;
class General_options;
class Search_directory;
class Input_file_group;
class Input_file_lib;
class Position_dependent_options;
class Target;
class Plugin_manager;
class Script_info;
// Incremental build action for a specific file, as selected by the user.
enum Incremental_disposition
{
// Startup files that appear before the first disposition option.
// These will default to INCREMENTAL_CHECK unless the
// --incremental-startup-unchanged option is given.
// (For files added implicitly by gcc before any user options.)
INCREMENTAL_STARTUP,
// Determine the status from the timestamp (default).
INCREMENTAL_CHECK,
// Assume the file changed from the previous build.
INCREMENTAL_CHANGED,
// Assume the file didn't change from the previous build.
INCREMENTAL_UNCHANGED
};
// The nested namespace is to contain all the global variables and
// structs that need to be defined in the .h file, but do not need to
// be used outside this class.
namespace options
{
typedef std::vector<Search_directory> Dir_list;
typedef Unordered_set<std::string> String_set;
// These routines convert from a string option to various types.
// Each gives a fatal error if it cannot parse the argument.
extern void
parse_bool(const char* option_name, const char* arg, bool* retval);
extern void
parse_int(const char* option_name, const char* arg, int* retval);
extern void
parse_uint(const char* option_name, const char* arg, int* retval);
extern void
parse_uint64(const char* option_name, const char* arg, uint64_t* retval);
extern void
parse_double(const char* option_name, const char* arg, double* retval);
extern void
parse_percent(const char* option_name, const char* arg, double* retval);
extern void
parse_string(const char* option_name, const char* arg, const char** retval);
extern void
parse_optional_string(const char* option_name, const char* arg,
const char** retval);
extern void
parse_dirlist(const char* option_name, const char* arg, Dir_list* retval);
extern void
parse_set(const char* option_name, const char* arg, String_set* retval);
extern void
parse_choices(const char* option_name, const char* arg, const char** retval,
const char* choices[], int num_choices);
struct Struct_var;
// Most options have both a shortname (one letter) and a longname.
// This enum controls how many dashes are expected for longname access
// -- shortnames always use one dash. Most longnames will accept
// either one dash or two; the only difference between ONE_DASH and
// TWO_DASHES is how we print the option in --help. However, some
// longnames require two dashes, and some require only one. The
// special value DASH_Z means that the option is preceded by "-z".
enum Dashes
{
ONE_DASH, TWO_DASHES, EXACTLY_ONE_DASH, EXACTLY_TWO_DASHES, DASH_Z
};
// LONGNAME is the long-name of the option with dashes converted to
// underscores, or else the short-name if the option has no long-name.
// It is never the empty string.
// DASHES is an instance of the Dashes enum: ONE_DASH, TWO_DASHES, etc.
// SHORTNAME is the short-name of the option, as a char, or '\0' if the
// option has no short-name. If the option has no long-name, you
// should specify the short-name in *both* VARNAME and here.
// DEFAULT_VALUE is the value of the option if not specified on the
// commandline, as a string.
// HELPSTRING is the descriptive text used with the option via --help
// HELPARG is how you define the argument to the option.
// --help output is "-shortname HELPARG, --longname HELPARG: HELPSTRING"
// HELPARG should be NULL iff the option is a bool and takes no arg.
// OPTIONAL_ARG is true if this option takes an optional argument. An
// optional argument must be specifid as --OPTION=VALUE, not
// --OPTION VALUE.
// READER provides parse_to_value, which is a function that will convert
// a char* argument into the proper type and store it in some variable.
// IS_DEFAULT is true for boolean options that are on by default,
// and thus should have "(default)" printed with the helpstring.
// A One_option struct initializes itself with the global list of options
// at constructor time, so be careful making one of these.
struct One_option
{
std::string longname;
Dashes dashes;
char shortname;
const char* default_value;
const char* helpstring;
const char* helparg;
bool optional_arg;
Struct_var* reader;
bool is_default;
One_option(const char* ln, Dashes d, char sn, const char* dv,
const char* hs, const char* ha, bool oa, Struct_var* r,
bool id)
: longname(ln), dashes(d), shortname(sn), default_value(dv ? dv : ""),
helpstring(hs), helparg(ha), optional_arg(oa), reader(r),
is_default(id)
{
// In longname, we convert all underscores to dashes, since GNU
// style uses dashes in option names. longname is likely to have
// underscores in it because it's also used to declare a C++
// function.
const char* pos = strchr(this->longname.c_str(), '_');
for (; pos; pos = strchr(pos, '_'))
this->longname[pos - this->longname.c_str()] = '-';
// We only register ourselves if our helpstring is not NULL. This
// is to support the "no-VAR" boolean variables, which we
// conditionally turn on by defining "no-VAR" help text.
if (this->helpstring)
this->register_option();
}
// This option takes an argument iff helparg is not NULL.
bool
takes_argument() const
{ return this->helparg != NULL; }
// Whether the argument is optional.
bool
takes_optional_argument() const
{ return this->optional_arg; }
// Register this option with the global list of options.
void
register_option();
// Print this option to stdout (used with --help).
void
print() const;
};
// All options have a Struct_##varname that inherits from this and
// actually implements parse_to_value for that option.
struct Struct_var
{
// OPTION: the name of the option as specified on the commandline,
// including leading dashes, and any text following the option:
// "-O", "--defsym=mysym=0x1000", etc.
// ARG: the arg associated with this option, or NULL if the option
// takes no argument: "2", "mysym=0x1000", etc.
// CMDLINE: the global Command_line object. Used by DEFINE_special.
// OPTIONS: the global General_options object. Used by DEFINE_special.
virtual void
parse_to_value(const char* option, const char* arg,
Command_line* cmdline, General_options* options) = 0;
virtual
~Struct_var() // To make gcc happy.
{ }
};
// This is for "special" options that aren't of any predefined type.
struct Struct_special : public Struct_var
{
// If you change this, change the parse-fn in DEFINE_special as well.
typedef void (General_options::*Parse_function)(const char*, const char*,
Command_line*);
Struct_special(const char* varname, Dashes dashes, char shortname,
Parse_function parse_function,
const char* helpstring, const char* helparg)
: option(varname, dashes, shortname, "", helpstring, helparg, false, this,
false),
parse(parse_function)
{ }
void parse_to_value(const char* option, const char* arg,
Command_line* cmdline, General_options* options)
{ (options->*(this->parse))(option, arg, cmdline); }
One_option option;
Parse_function parse;
};
} // End namespace options.
// These are helper macros use by DEFINE_uint64/etc below.
// This macro is used inside the General_options_ class, so defines
// var() and set_var() as General_options methods. Arguments as are
// for the constructor for One_option. param_type__ is the same as
// type__ for built-in types, and "const type__ &" otherwise.
//
// When we define the linker command option "assert", the macro argument
// varname__ of DEFINE_var below will be replaced by "assert". On Mac OSX
// assert.h is included implicitly by one of the library headers we use. To
// avoid unintended macro substitution of "assert()", we need to enclose
// varname__ with parenthese.
#define DEFINE_var(varname__, dashes__, shortname__, default_value__, \
default_value_as_string__, helpstring__, helparg__, \
optional_arg__, type__, param_type__, parse_fn__, \
is_default__) \
public: \
param_type__ \
(varname__)() const \
{ return this->varname__##_.value; } \
\
bool \
user_set_##varname__() const \
{ return this->varname__##_.user_set_via_option; } \
\
void \
set_user_set_##varname__() \
{ this->varname__##_.user_set_via_option = true; } \
\
static const bool varname__##is_default = is_default__; \
\
private: \
struct Struct_##varname__ : public options::Struct_var \
{ \
Struct_##varname__() \
: option(#varname__, dashes__, shortname__, default_value_as_string__, \
helpstring__, helparg__, optional_arg__, this, is_default__), \
user_set_via_option(false), value(default_value__) \
{ } \
\
void \
parse_to_value(const char* option_name, const char* arg, \
Command_line*, General_options*) \
{ \
parse_fn__(option_name, arg, &this->value); \
this->user_set_via_option = true; \
} \
\
options::One_option option; \
bool user_set_via_option; \
type__ value; \
}; \
Struct_##varname__ varname__##_; \
void \
set_##varname__(param_type__ value) \
{ this->varname__##_.value = value; }
// These macros allow for easy addition of a new commandline option.
// If no_helpstring__ is not NULL, then in addition to creating
// VARNAME, we also create an option called no-VARNAME (or, for a -z
// option, noVARNAME).
#define DEFINE_bool(varname__, dashes__, shortname__, default_value__, \
helpstring__, no_helpstring__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
default_value__ ? "true" : "false", helpstring__, NULL, \
false, bool, bool, options::parse_bool, default_value__) \
struct Struct_no_##varname__ : public options::Struct_var \
{ \
Struct_no_##varname__() : option((dashes__ == options::DASH_Z \
? "no" #varname__ \
: "no-" #varname__), \
dashes__, '\0', \
default_value__ ? "false" : "true", \
no_helpstring__, NULL, false, this, \
!(default_value__)) \
{ } \
\
void \
parse_to_value(const char*, const char*, \
Command_line*, General_options* options) \
{ \
options->set_##varname__(false); \
options->set_user_set_##varname__(); \
} \
\
options::One_option option; \
}; \
Struct_no_##varname__ no_##varname__##_initializer_
#define DEFINE_bool_ignore(varname__, dashes__, shortname__, \
helpstring__, no_helpstring__) \
DEFINE_var(varname__, dashes__, shortname__, false, \
"false", helpstring__, NULL, \
false, bool, bool, options::parse_bool, false) \
struct Struct_no_##varname__ : public options::Struct_var \
{ \
Struct_no_##varname__() : option((dashes__ == options::DASH_Z \
? "no" #varname__ \
: "no-" #varname__), \
dashes__, '\0', \
"false", \
no_helpstring__, NULL, false, this, \
false) \
{ } \
\
void \
parse_to_value(const char*, const char*, \
Command_line*, General_options* options) \
{ \
options->set_##varname__(false); \
options->set_user_set_##varname__(); \
} \
\
options::One_option option; \
}; \
Struct_no_##varname__ no_##varname__##_initializer_
#define DEFINE_enable(varname__, dashes__, shortname__, default_value__, \
helpstring__, no_helpstring__) \
DEFINE_var(enable_##varname__, dashes__, shortname__, default_value__, \
default_value__ ? "true" : "false", helpstring__, NULL, \
false, bool, bool, options::parse_bool, default_value__) \
struct Struct_disable_##varname__ : public options::Struct_var \
{ \
Struct_disable_##varname__() : option("disable-" #varname__, \
dashes__, '\0', \
default_value__ ? "false" : "true", \
no_helpstring__, NULL, false, this, \
!default_value__) \
{ } \
\
void \
parse_to_value(const char*, const char*, \
Command_line*, General_options* options) \
{ options->set_enable_##varname__(false); } \
\
options::One_option option; \
}; \
Struct_disable_##varname__ disable_##varname__##_initializer_
#define DEFINE_int(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
#default_value__, helpstring__, helparg__, false, \
int, int, options::parse_int, false)
#define DEFINE_uint(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
#default_value__, helpstring__, helparg__, false, \
int, int, options::parse_uint, false)
#define DEFINE_uint64(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
#default_value__, helpstring__, helparg__, false, \
uint64_t, uint64_t, options::parse_uint64, false)
#define DEFINE_double(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
#default_value__, helpstring__, helparg__, false, \
double, double, options::parse_double, false)
#define DEFINE_percent(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__ / 100.0, \
#default_value__, helpstring__, helparg__, false, \
double, double, options::parse_percent, false)
#define DEFINE_string(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
default_value__, helpstring__, helparg__, false, \
const char*, const char*, options::parse_string, false)
// This is like DEFINE_string, but we convert each occurrence to a
// Search_directory and store it in a vector. Thus we also have the
// add_to_VARNAME() method, to append to the vector.
#define DEFINE_dirlist(varname__, dashes__, shortname__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, , \
"", helpstring__, helparg__, false, options::Dir_list, \
const options::Dir_list&, options::parse_dirlist, false) \
void \
add_to_##varname__(const char* new_value) \
{ options::parse_dirlist(NULL, new_value, &this->varname__##_.value); } \
void \
add_search_directory_to_##varname__(const Search_directory& dir) \
{ this->varname__##_.value.push_back(dir); }
// This is like DEFINE_string, but we store a set of strings.
#define DEFINE_set(varname__, dashes__, shortname__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, , \
"", helpstring__, helparg__, false, options::String_set, \
const options::String_set&, options::parse_set, false) \
public: \
bool \
any_##varname__() const \
{ return !this->varname__##_.value.empty(); } \
\
bool \
is_##varname__(const char* symbol) const \
{ \
return (!this->varname__##_.value.empty() \
&& (this->varname__##_.value.find(std::string(symbol)) \
!= this->varname__##_.value.end())); \
} \
\
options::String_set::const_iterator \
varname__##_begin() const \
{ return this->varname__##_.value.begin(); } \
\
options::String_set::const_iterator \
varname__##_end() const \
{ return this->varname__##_.value.end(); } \
\
options::String_set::size_type \
varname__##_size() const \
{ return this->varname__##_.value.size(); } \
// When you have a list of possible values (expressed as string)
// After helparg__ should come an initializer list, like
// {"foo", "bar", "baz"}
#define DEFINE_enum(varname__, dashes__, shortname__, default_value__, \
helpstring__, helparg__, ...) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
default_value__, helpstring__, helparg__, false, \
const char*, const char*, parse_choices_##varname__, false) \
private: \
static void parse_choices_##varname__(const char* option_name, \
const char* arg, \
const char** retval) { \
const char* choices[] = __VA_ARGS__; \
options::parse_choices(option_name, arg, retval, \
choices, sizeof(choices) / sizeof(*choices)); \
}
// This is like DEFINE_bool, but VARNAME is the name of a different
// option. This option becomes an alias for that one. INVERT is true
// if this option is an inversion of the other one.
#define DEFINE_bool_alias(option__, varname__, dashes__, shortname__, \
helpstring__, no_helpstring__, invert__) \
private: \
struct Struct_##option__ : public options::Struct_var \
{ \
Struct_##option__() \
: option(#option__, dashes__, shortname__, "", helpstring__, \
NULL, false, this, \
General_options::varname__##is_default ^ invert__) \
{ } \
\
void \
parse_to_value(const char*, const char*, \
Command_line*, General_options* options) \
{ \
options->set_##varname__(!invert__); \
options->set_user_set_##varname__(); \
} \
\
options::One_option option; \
}; \
Struct_##option__ option__##_; \
\
struct Struct_no_##option__ : public options::Struct_var \
{ \
Struct_no_##option__() \
: option((dashes__ == options::DASH_Z \
? "no" #option__ \
: "no-" #option__), \
dashes__, '\0', "", no_helpstring__, \
NULL, false, this, \
!General_options::varname__##is_default ^ invert__) \
{ } \
\
void \
parse_to_value(const char*, const char*, \
Command_line*, General_options* options) \
{ \
options->set_##varname__(invert__); \
options->set_user_set_##varname__(); \
} \
\
options::One_option option; \
}; \
Struct_no_##option__ no_##option__##_initializer_
// This is like DEFINE_uint64, but VARNAME is the name of a different
// option. This option becomes an alias for that one.
#define DEFINE_uint64_alias(option__, varname__, dashes__, shortname__, \
helpstring__, helparg__) \
private: \
struct Struct_##option__ : public options::Struct_var \
{ \
Struct_##option__() \
: option(#option__, dashes__, shortname__, "", helpstring__, \
helparg__, false, this, false) \
{ } \
\
void \
parse_to_value(const char* option_name, const char* arg, \
Command_line*, General_options* options) \
{ \
uint64_t value; \
options::parse_uint64(option_name, arg, &value); \
options->set_##varname__(value); \
options->set_user_set_##varname__(); \
} \
\
options::One_option option; \
}; \
Struct_##option__ option__##_;
// This is used for non-standard flags. It defines no functions; it
// just calls General_options::parse_VARNAME whenever the flag is
// seen. We declare parse_VARNAME as a static member of
// General_options; you are responsible for defining it there.
// helparg__ should be NULL iff this special-option is a boolean.
#define DEFINE_special(varname__, dashes__, shortname__, \
helpstring__, helparg__) \
private: \
void parse_##varname__(const char* option, const char* arg, \
Command_line* inputs); \
struct Struct_##varname__ : public options::Struct_special \
{ \
Struct_##varname__() \
: options::Struct_special(#varname__, dashes__, shortname__, \
&General_options::parse_##varname__, \
helpstring__, helparg__) \
{ } \
}; \
Struct_##varname__ varname__##_initializer_
// An option that takes an optional string argument. If the option is
// used with no argument, the value will be the default, and
// user_set_via_option will be true.
#define DEFINE_optional_string(varname__, dashes__, shortname__, \
default_value__, \
helpstring__, helparg__) \
DEFINE_var(varname__, dashes__, shortname__, default_value__, \
default_value__, helpstring__, helparg__, true, \
const char*, const char*, options::parse_optional_string, \
false)
// A directory to search. For each directory we record whether it is
// in the sysroot. We need to know this so that, if a linker script
// is found within the sysroot, we will apply the sysroot to any files
// named by that script.
class Search_directory
{
public:
// We need a default constructor because we put this in a
// std::vector.
Search_directory()
: name_(NULL), put_in_sysroot_(false), is_in_sysroot_(false)
{ }
// This is the usual constructor.
Search_directory(const std::string& name, bool put_in_sysroot)
: name_(name), put_in_sysroot_(put_in_sysroot), is_in_sysroot_(false)
{
if (this->name_.empty())
this->name_ = ".";
}
// This is called if we have a sysroot. The sysroot is prefixed to
// any entries for which put_in_sysroot_ is true. is_in_sysroot_ is
// set to true for any enries which are in the sysroot (this will
// naturally include any entries for which put_in_sysroot_ is true).
// SYSROOT is the sysroot, CANONICAL_SYSROOT is the result of
// passing SYSROOT to lrealpath.
void
add_sysroot(const char* sysroot, const char* canonical_sysroot);
// Get the directory name.
const std::string&
name() const
{ return this->name_; }
// Return whether this directory is in the sysroot.
bool
is_in_sysroot() const
{ return this->is_in_sysroot_; }
// Return whether this is considered a system directory.
bool
is_system_directory() const
{ return this->put_in_sysroot_ || this->is_in_sysroot_; }
private:
// The directory name.
std::string name_;
// True if the sysroot should be added as a prefix for this
// directory (if there is a sysroot). This is true for system
// directories that we search by default.
bool put_in_sysroot_;
// True if this directory is in the sysroot (if there is a sysroot).
// This is true if there is a sysroot and either 1) put_in_sysroot_
// is true, or 2) the directory happens to be in the sysroot based
// on a pathname comparison.
bool is_in_sysroot_;
};
class General_options
{
private:
// NOTE: For every option that you add here, also consider if you
// should add it to Position_dependent_options.
DEFINE_special(help, options::TWO_DASHES, '\0',
N_("Report usage information"), NULL);
DEFINE_special(version, options::TWO_DASHES, 'v',
N_("Report version information"), NULL);
DEFINE_special(V, options::EXACTLY_ONE_DASH, '\0',
N_("Report version and target information"), NULL);
// These options are sorted approximately so that for each letter in
// the alphabet, we show the option whose shortname is that letter
// (if any) and then every longname that starts with that letter (in
// alphabetical order). For both, lowercase sorts before uppercase.
// The -z options come last.
// a
DEFINE_bool(add_needed, options::TWO_DASHES, '\0', false,
N_("Not supported"),
N_("Do not copy DT_NEEDED tags from shared libraries"));
DEFINE_bool_alias(allow_multiple_definition, muldefs, options::TWO_DASHES,
'\0',
N_("Allow multiple definitions of symbols"),
N_("Do not allow multiple definitions"), false);
DEFINE_bool(allow_shlib_undefined, options::TWO_DASHES, '\0', false,
N_("Allow unresolved references in shared libraries"),
N_("Do not allow unresolved references in shared libraries"));
DEFINE_bool(apply_dynamic_relocs, options::TWO_DASHES, '\0', true,
N_("Apply link-time values for dynamic relocations"),
N_("(aarch64 only) Do not apply link-time values "
"for dynamic relocations"));
DEFINE_bool(as_needed, options::TWO_DASHES, '\0', false,
N_("Use DT_NEEDED only for shared libraries that are used"),
N_("Use DT_NEEDED for all shared libraries"));
DEFINE_enum(assert, options::ONE_DASH, '\0', NULL,
N_("Ignored"), N_("[ignored]"),
{"definitions", "nodefinitions", "nosymbolic", "pure-text"});
// b
// This should really be an "enum", but it's too easy for folks to
// forget to update the list as they add new targets. So we just
// accept any string. We'll fail later (when the string is parsed),
// if the target isn't actually supported.
DEFINE_string(format, options::TWO_DASHES, 'b', "elf",
N_("Set input format"), ("[elf,binary]"));
DEFINE_bool(be8, options::TWO_DASHES, '\0', false,
N_("Output BE8 format image"), NULL);
DEFINE_optional_string(build_id, options::TWO_DASHES, '\0', "tree",
N_("Generate build ID note"),
N_("[=STYLE]"));
DEFINE_uint64(build_id_chunk_size_for_treehash,
options::TWO_DASHES, '\0', 2 << 20,
N_("Chunk size for '--build-id=tree'"), N_("SIZE"));
DEFINE_uint64(build_id_min_file_size_for_treehash, options::TWO_DASHES,
'\0', 40 << 20,
N_("Minimum output file size for '--build-id=tree' to work"
" differently than '--build-id=sha1'"), N_("SIZE"));
DEFINE_bool(Bdynamic, options::ONE_DASH, '\0', true,
N_("-l searches for shared libraries"), NULL);
DEFINE_bool_alias(Bstatic, Bdynamic, options::ONE_DASH, '\0',
N_("-l does not search for shared libraries"), NULL,
true);
DEFINE_bool_alias(dy, Bdynamic, options::ONE_DASH, '\0',
N_("alias for -Bdynamic"), NULL, false);
DEFINE_bool_alias(dn, Bdynamic, options::ONE_DASH, '\0',
N_("alias for -Bstatic"), NULL, true);
DEFINE_bool(Bgroup, options::ONE_DASH, '\0', false,
N_("Use group name lookup rules for shared library"), NULL);
DEFINE_bool(Bshareable, options::ONE_DASH, '\0', false,
N_("Generate shared library (alias for -G/-shared)"), NULL);
DEFINE_bool(Bsymbolic, options::ONE_DASH, '\0', false,
N_("Bind defined symbols locally"), NULL);
DEFINE_bool(Bsymbolic_functions, options::ONE_DASH, '\0', false,
N_("Bind defined function symbols locally"), NULL);
// c
DEFINE_bool(check_sections, options::TWO_DASHES, '\0', true,
N_("Check segment addresses for overlaps"),
N_("Do not check segment addresses for overlaps"));
DEFINE_enum(compress_debug_sections, options::TWO_DASHES, '\0', "none",
N_("Compress .debug_* sections in the output file"),
("[none,zlib,zlib-gnu,zlib-gabi]"),
{"none", "zlib", "zlib-gnu", "zlib-gabi"});
DEFINE_bool(copy_dt_needed_entries, options::TWO_DASHES, '\0', false,
N_("Not supported"),
N_("Do not copy DT_NEEDED tags from shared libraries"));
DEFINE_bool(cref, options::TWO_DASHES, '\0', false,
N_("Output cross reference table"),
N_("Do not output cross reference table"));
DEFINE_bool(ctors_in_init_array, options::TWO_DASHES, '\0', true,
N_("Use DT_INIT_ARRAY for all constructors"),
N_("Handle constructors as directed by compiler"));
// d
DEFINE_bool(define_common, options::TWO_DASHES, 'd', false,
N_("Define common symbols"),
N_("Do not define common symbols in relocatable output"));
DEFINE_bool(dc, options::ONE_DASH, '\0', false,
N_("Alias for -d"), NULL);
DEFINE_bool(dp, options::ONE_DASH, '\0', false,
N_("Alias for -d"), NULL);
DEFINE_string(debug, options::TWO_DASHES, '\0', "",
N_("Turn on debugging"),
N_("[all,files,script,task][,...]"));
DEFINE_special(defsym, options::TWO_DASHES, '\0',
N_("Define a symbol"), N_("SYMBOL=EXPRESSION"));
DEFINE_optional_string(demangle, options::TWO_DASHES, '\0', NULL,
N_("Demangle C++ symbols in log messages"),
N_("[=STYLE]"));
DEFINE_bool(no_demangle, options::TWO_DASHES, '\0', false,
N_("Do not demangle C++ symbols in log messages"),
NULL);
DEFINE_bool(detect_odr_violations, options::TWO_DASHES, '\0', false,
N_("Look for violations of the C++ One Definition Rule"),
N_("Do not look for violations of the C++ One Definition Rule"));
DEFINE_bool(dynamic_list_data, options::TWO_DASHES, '\0', false,
N_("Add data symbols to dynamic symbols"), NULL);
DEFINE_bool(dynamic_list_cpp_new, options::TWO_DASHES, '\0', false,
N_("Add C++ operator new/delete to dynamic symbols"), NULL);
DEFINE_bool(dynamic_list_cpp_typeinfo, options::TWO_DASHES, '\0', false,
N_("Add C++ typeinfo to dynamic symbols"), NULL);
DEFINE_special(dynamic_list, options::TWO_DASHES, '\0',
N_("Read a list of dynamic symbols"), N_("FILE"));
// e
DEFINE_bool(emit_stub_syms, options::TWO_DASHES, '\0', true,
N_("(PowerPC only) Label linker stubs with a symbol"),
N_("(PowerPC only) Do not label linker stubs with a symbol"));
DEFINE_string(entry, options::TWO_DASHES, 'e', NULL,
N_("Set program start address"), N_("ADDRESS"));
DEFINE_bool(eh_frame_hdr, options::TWO_DASHES, '\0', false,
N_("Create exception frame header"),
N_("Do not create exception frame header"));
// Alphabetized under 'e' because the option is spelled --enable-new-dtags.
DEFINE_enable(new_dtags, options::EXACTLY_TWO_DASHES, '\0', true,
N_("Enable use of DT_RUNPATH"),
N_("Disable use of DT_RUNPATH"));
DEFINE_bool(enum_size_warning, options::TWO_DASHES, '\0', true, NULL,
N_("(ARM only) Do not warn about objects with incompatible "
"enum sizes"));
DEFINE_special(exclude_libs, options::TWO_DASHES, '\0',
N_("Exclude libraries from automatic export"),
N_(("lib,lib ...")));
DEFINE_bool(export_dynamic, options::TWO_DASHES, 'E', false,
N_("Export all dynamic symbols"),
N_("Do not export all dynamic symbols"));
DEFINE_set(export_dynamic_symbol, options::TWO_DASHES, '\0',
N_("Export SYMBOL to dynamic symbol table"), N_("SYMBOL"));
DEFINE_special(EB, options::ONE_DASH, '\0',
N_("Link big-endian objects."), NULL);
DEFINE_special(EL, options::ONE_DASH, '\0',
N_("Link little-endian objects."), NULL);
// f
DEFINE_set(auxiliary, options::TWO_DASHES, 'f',
N_("Auxiliary filter for shared object symbol table"),
N_("SHLIB"));
DEFINE_string(filter, options::TWO_DASHES, 'F', NULL,
N_("Filter for shared object symbol table"),
N_("SHLIB"));
DEFINE_bool(fatal_warnings, options::TWO_DASHES, '\0', false,
N_("Treat warnings as errors"),
N_("Do not treat warnings as errors"));
DEFINE_string(fini, options::ONE_DASH, '\0', "_fini",
N_("Call SYMBOL at unload-time"), N_("SYMBOL"));
DEFINE_bool(fix_arm1176, options::TWO_DASHES, '\0', true,
N_("(ARM only) Fix binaries for ARM1176 erratum"),
N_("(ARM only) Do not fix binaries for ARM1176 erratum"));
DEFINE_bool(fix_cortex_a8, options::TWO_DASHES, '\0', false,
N_("(ARM only) Fix binaries for Cortex-A8 erratum"),
N_("(ARM only) Do not fix binaries for Cortex-A8 erratum"));
DEFINE_bool(fix_cortex_a53_843419, options::TWO_DASHES, '\0', false,
N_("(AArch64 only) Fix Cortex-A53 erratum 843419"),
N_("(AArch64 only) Do not fix Cortex-A53 erratum 843419"));
DEFINE_bool(fix_cortex_a53_835769, options::TWO_DASHES, '\0', false,
N_("(AArch64 only) Fix Cortex-A53 erratum 835769"),
N_("(AArch64 only) Do not fix Cortex-A53 erratum 835769"));
DEFINE_special(fix_v4bx, options::TWO_DASHES, '\0',
N_("(ARM only) Rewrite BX rn as MOV pc, rn for ARMv4"),
NULL);
DEFINE_special(fix_v4bx_interworking, options::TWO_DASHES, '\0',
N_("(ARM only) Rewrite BX rn branch to ARMv4 interworking "
"veneer"),
NULL);
DEFINE_string(fuse_ld, options::ONE_DASH, '\0', "",
N_("Ignored for GCC linker option compatibility"),
N_("[gold,bfd]"));
// g
DEFINE_bool(g, options::EXACTLY_ONE_DASH, '\0', false,
N_("Ignored"), NULL);
DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false,
N_("Remove unused sections"),
N_("Don't remove unused sections"));
DEFINE_bool(gdb_index, options::TWO_DASHES, '\0', false,
N_("Generate .gdb_index section"),
N_("Do not generate .gdb_index section"));
DEFINE_bool(gnu_unique, options::TWO_DASHES, '\0', true,
N_("Enable STB_GNU_UNIQUE symbol binding"),
N_("Disable STB_GNU_UNIQUE symbol binding"));
DEFINE_bool(shared, options::ONE_DASH, 'G', false,
N_("Generate shared library"), NULL);
// h
DEFINE_string(soname, options::ONE_DASH, 'h', NULL,
N_("Set shared library name"), N_("FILENAME"));
DEFINE_double(hash_bucket_empty_fraction, options::TWO_DASHES, '\0', 0.0,
N_("Min fraction of empty buckets in dynamic hash"),
N_("FRACTION"));
DEFINE_enum(hash_style, options::TWO_DASHES, '\0', DEFAULT_HASH_STYLE,
N_("Dynamic hash style"), N_("[sysv,gnu,both]"),
{"sysv", "gnu", "both"});
// i
DEFINE_bool_alias(i, relocatable, options::EXACTLY_ONE_DASH, '\0',
N_("Alias for -r"), NULL, false);
DEFINE_enum(icf, options::TWO_DASHES, '\0', "none",
N_("Identical Code Folding. "
"\'--icf=safe\' Folds ctors, dtors and functions whose"
" pointers are definitely not taken"),
("[none,all,safe]"),
{"none", "all", "safe"});
DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0,
N_("Number of iterations of ICF (default 2)"), N_("COUNT"));
DEFINE_special(incremental, options::TWO_DASHES, '\0',
N_("Do an incremental link if possible; "
"otherwise, do a full link and prepare output "
"for incremental linking"), NULL);
DEFINE_special(no_incremental, options::TWO_DASHES, '\0',
N_("Do a full link (default)"), NULL);
DEFINE_special(incremental_full, options::TWO_DASHES, '\0',
N_("Do a full link and "
"prepare output for incremental linking"), NULL);
DEFINE_special(incremental_update, options::TWO_DASHES, '\0',
N_("Do an incremental link; exit if not possible"), NULL);
DEFINE_string(incremental_base, options::TWO_DASHES, '\0', NULL,
N_("Set base file for incremental linking"
" (default is output file)"),
N_("FILE"));
DEFINE_special(incremental_changed, options::TWO_DASHES, '\0',
N_("Assume files changed"), NULL);
DEFINE_special(incremental_unchanged, options::TWO_DASHES, '\0',
N_("Assume files didn't change"), NULL);
DEFINE_special(incremental_unknown, options::TWO_DASHES, '\0',
N_("Use timestamps to check files (default)"), NULL);
DEFINE_special(incremental_startup_unchanged, options::TWO_DASHES, '\0',
N_("Assume startup files unchanged "
"(files preceding this option)"), NULL);
DEFINE_percent(incremental_patch, options::TWO_DASHES, '\0', 10,
N_("Amount of extra space to allocate for patches "
"(default 10)"),
N_("PERCENT"));
DEFINE_string(init, options::ONE_DASH, '\0', "_init",
N_("Call SYMBOL at load-time"), N_("SYMBOL"));
DEFINE_string(dynamic_linker, options::TWO_DASHES, 'I', NULL,
N_("Set dynamic linker path"), N_("PROGRAM"));
// j
DEFINE_special(just_symbols, options::TWO_DASHES, '\0',
N_("Read only symbol values from FILE"), N_("FILE"));
// k