2fea87da39a16b75e95db80f8baa8cadafe82fa6
1 // options.c -- handle command line options for gold
11 // The information we keep for a single command line option.
13 struct options::One_option
15 // The single character option name, or '\0' if this is only a long
19 // The long option name, or NULL if this is only a short option.
20 const char* long_option
;
22 // Description of the option for --help output, or NULL if there is none.
25 // How to print the option name in --help output, or NULL to use the
27 const char* help_output
;
29 // Long option dash control. This is ignored if long_option is
33 // Long option normally takes one dash; two dashes are also
36 // Long option normally takes two dashes; one dash is also
39 // Long option always takes two dashes.
43 // Function for special handling, or NULL. Returns the number of
44 // arguments to skip. This will normally be at least 1, but it may
45 // be 0 if this function changes *argv. ARG points to the location
46 // in *ARGV where the option starts, which may be helpful for a
48 int (*special
)(int argc
, char** argv
, char *arg
, Command_line
*);
50 // If this is a position independent option which does not take an
51 // argument, this is the member function to call to record it.
52 void (General_options::*general_noarg
)();
54 // If this is a position independent function which takes an
55 // argument, this is the member function to call to record it.
56 void (General_options::*general_arg
)(const char*);
58 // If this is a position dependent option which does not take an
59 // argument, this is the member function to call to record it.
60 void (Position_dependent_options::*dependent_noarg
)();
62 // If this is a position dependent option which takes an argument,
63 // this is the member function to record it.
64 void (Position_dependent_options::*dependent_arg
)(const char*);
66 // Return whether this option takes an argument.
68 takes_argument() const
69 { return this->general_arg
!= NULL
|| this->dependent_arg
!= NULL
; }
72 class options::Command_line_options
75 static const One_option options
[];
76 static const int options_size
;
79 } // End namespace gold.
84 // Handle the special -l option, which adds an input file.
87 library(int argc
, char** argv
, char* arg
, gold::Command_line
* cmdline
)
89 return cmdline
->process_l_option(argc
, argv
, arg
);
92 // Handle the special --start-group option.
95 start_group(int, char**, char* arg
, gold::Command_line
* cmdline
)
97 cmdline
->start_group(arg
);
101 // Handle the special --end-group option.
104 end_group(int, char**, char* arg
, gold::Command_line
* cmdline
)
106 cmdline
->end_group(arg
);
110 // Report usage information for ld --help, and exit.
113 help(int, char**, char*, gold::Command_line
*)
115 printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name
);
117 const int options_size
= gold::options::Command_line_options::options_size
;
118 const gold::options::One_option
* options
=
119 gold::options::Command_line_options::options
;
120 for (int i
= 0; i
< options_size
; ++i
)
122 if (options
[i
].doc
== NULL
)
132 if (options
[j
].help_output
!= NULL
)
139 printf(options
[j
].help_output
);
140 len
+= std::strlen(options
[i
].help_output
);
144 if (options
[j
].short_option
!= '\0')
151 printf("-%c", options
[j
].short_option
);
155 if (options
[j
].long_option
!= NULL
)
162 if (options
[j
].dash
== gold::options::One_option::ONE_DASH
)
172 printf("%s", options
[j
].long_option
);
173 len
+= std::strlen(options
[j
].long_option
);
178 while (j
< options_size
&& options
[j
].doc
== NULL
);
185 for (; len
< 30; ++len
)
188 std::puts(options
[i
].doc
);
191 gold::gold_exit(true);
196 } // End anonymous namespace.
201 // Helper macros used to specify the options. We could also do this
202 // using constructors, but then g++ would generate code to initialize
203 // the array. We want the array to be initialized statically so that
204 // we get better startup time.
206 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
207 { short_option, long_option, doc, help, options::One_option::dash, \
208 NULL, func, NULL, NULL, NULL }
209 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func) \
210 { short_option, long_option, doc, help, options::One_option::dash, \
211 NULL, NULL, func, NULL, NULL }
212 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func) \
213 { short_option, long_option, doc, help, options::One_option::dash, \
214 NULL, NULL, NULL, func, NULL }
215 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func) \
216 { short_option, long_option, doc, help, options::One_option::dash, \
217 NULL, NULL, NULL, NULL, func }
218 #define SPECIAL(short_option, long_option, doc, help, dash, func) \
219 { short_option, long_option, doc, help, options::One_option::dash, \
220 func, NULL, NULL, NULL, NULL }
222 // Here is the actual list of options which we accept.
224 const options::One_option
225 options::Command_line_options::options
[] =
227 SPECIAL('l', "library", N_("Search for library LIBNAME"),
228 N_("-lLIBNAME --library LIBNAME"), TWO_DASHES
,
230 SPECIAL('(', "start-group", N_("Start a library search group"), NULL
,
231 TWO_DASHES
, &start_group
),
232 SPECIAL(')', "end-group", N_("End a library search group"), NULL
,
233 TWO_DASHES
, &end_group
),
234 GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
235 N_("-L DIR, --library-path DIR"), TWO_DASHES
,
236 &General_options::add_to_search_path
),
237 GENERAL_ARG('m', NULL
, N_("Ignored for compatibility"), NULL
, ONE_DASH
,
238 &General_options::ignore
),
239 GENERAL_ARG('o', "output", N_("Set output file name"),
240 N_("-o FILE, --output FILE"), TWO_DASHES
,
241 &General_options::set_output_file_name
),
242 GENERAL_NOARG('r', NULL
, N_("Generate relocatable output"), NULL
,
243 ONE_DASH
, &General_options::set_relocatable
),
244 GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
245 NULL
, ONE_DASH
, &General_options::set_shared
),
246 GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
247 NULL
, ONE_DASH
, &General_options::set_static
),
248 SPECIAL('\0', "help", N_("Report usage information"), NULL
,
252 const int options::Command_line_options::options_size
=
253 sizeof (options
) / sizeof (options
[0]);
255 // The default values for the general options.
257 General_options::General_options()
259 output_file_name_("a.out"),
260 is_relocatable_(false),
266 // The default values for the position dependent options.
268 Position_dependent_options::Position_dependent_options()
269 : do_static_search_(false)
273 // Command_line options.
275 Command_line::Command_line()
276 : options_(), position_options_(), inputs_(), in_group_(false)
280 // Process the command line options.
283 Command_line::process(int argc
, char** argv
)
285 const int options_size
= options::Command_line_options::options_size
;
286 const options::One_option
* options
=
287 options::Command_line_options::options
;
288 bool no_more_options
= false;
292 if (argv
[i
][0] != '-' || no_more_options
)
294 this->add_file(argv
[i
], false);
299 // Option starting with '-'.
301 if (argv
[i
][1] == '-')
304 if (argv
[i
][2] == '\0')
306 no_more_options
= true;
311 // Look for a long option match.
312 char* opt
= argv
[i
] + dashes
;
315 char* arg
= strchr(opt
, '=');
318 else if (i
+ 1 < argc
)
325 for (j
= 0; j
< options_size
; ++j
)
327 if (options
[j
].long_option
!= NULL
330 != options::One_option::EXACTLY_TWO_DASHES
))
331 && first
== options
[j
].long_option
[0]
332 && strcmp(opt
, options
[j
].long_option
) == 0)
334 if (options
[j
].special
)
335 i
+= options
[j
].special(argc
- 1, argv
+ i
, opt
, this);
338 if (!options
[j
].takes_argument())
346 this->usage(_("missing argument"), argv
[i
]);
348 this->apply_option(options
[j
], arg
);
354 if (j
< options_size
)
357 // If we saw two dashes, we need to see a long option.
359 this->usage(_("unknown option"), argv
[i
]);
361 // Look for a short option match. There may be more than one
362 // short option in a given argument.
364 char* s
= argv
[i
] + 1;
366 while (*s
!= '\0' && !done
)
370 for (j
= 0; j
< options_size
; ++j
)
372 if (options
[j
].short_option
== opt
)
374 if (options
[j
].special
)
376 // Undo the argument skip done above.
378 i
+= options
[j
].special(argc
- i
, argv
+ i
, s
, this);
384 if (options
[j
].takes_argument())
397 this->usage(_("missing argument"), opt
);
399 this->apply_option(options
[j
], arg
);
405 if (j
>= options_size
)
406 this->usage(_("unknown option"), *s
);
414 fprintf(stderr
, _("%s: missing group end"), program_name
);
418 // FIXME: We should only do this when configured in native mode.
419 this->options_
.add_to_search_path("/lib");
420 this->options_
.add_to_search_path("/usr/lib");
423 // Apply a command line option.
426 Command_line::apply_option(const options::One_option
& opt
,
431 if (opt
.general_noarg
)
432 (this->options_
.*(opt
.general_noarg
))();
433 else if (opt
.dependent_noarg
)
434 (this->position_options_
.*(opt
.dependent_noarg
))();
441 (this->options_
.*(opt
.general_arg
))(arg
);
442 else if (opt
.dependent_arg
)
443 (this->position_options_
.*(opt
.dependent_arg
))(arg
);
449 // Add an input file or library.
452 Command_line::add_file(const char* name
, bool is_lib
)
454 Input_file_argument
file(name
, is_lib
, this->position_options_
);
455 if (!this->in_group_
)
456 this->inputs_
.push_back(Input_argument(file
));
459 assert(!this->inputs_
.empty());
460 assert(this->inputs_
.back().is_group());
461 this->inputs_
.back().group()->add_file(file
);
465 // Handle the -l option, which requires special treatment.
468 Command_line::process_l_option(int argc
, char** argv
, char* arg
)
480 libname
= argv
[argc
+ 1];
483 this->usage(_("missing argument"), arg
);
485 this->add_file(libname
, true);
490 // Handle the --start-group option.
493 Command_line::start_group(const char* arg
)
496 this->usage(_("may not nest groups"), arg
);
498 // This object is leaked.
499 Input_file_group
* group
= new Input_file_group();
500 this->inputs_
.push_back(Input_argument(group
));
502 this->in_group_
= true;
505 // Handle the --end-group option.
508 Command_line::end_group(const char* arg
)
510 if (!this->in_group_
)
511 this->usage(_("group end without group start"), arg
);
512 this->in_group_
= false;
515 // Report a usage error. */
518 Command_line::usage()
521 _("%s: use the --help option for usage information\n"),
527 Command_line::usage(const char* msg
, const char *opt
)
531 program_name
, opt
, msg
);
536 Command_line::usage(const char* msg
, char opt
)
540 program_name
, opt
, msg
);
544 } // End namespace gold.
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