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 // Report usage information for ld --help, and exit.
95 help(int, char**, char*, gold::Command_line
*)
97 printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name
);
99 const int options_size
= gold::options::Command_line_options::options_size
;
100 const gold::options::One_option
* options
=
101 gold::options::Command_line_options::options
;
102 for (int i
= 0; i
< options_size
; ++i
)
104 if (options
[i
].doc
== NULL
)
114 if (options
[j
].help_output
!= NULL
)
121 printf(options
[j
].help_output
);
122 len
+= std::strlen(options
[i
].help_output
);
126 if (options
[j
].short_option
!= '\0')
133 printf("-%c", options
[j
].short_option
);
137 if (options
[j
].long_option
!= NULL
)
144 if (options
[j
].dash
== gold::options::One_option::ONE_DASH
)
154 printf("%s", options
[j
].long_option
);
155 len
+= std::strlen(options
[j
].long_option
);
160 while (j
< options_size
&& options
[j
].doc
== NULL
);
167 for (; len
< 30; ++len
)
170 std::puts(options
[i
].doc
);
173 gold::gold_exit(true);
178 } // End anonymous namespace.
183 // Helper macros used to specify the options. We could also do this
184 // using constructors, but then g++ would generate code to initialize
185 // the array. We want the array to be initialized statically so that
186 // we get better startup time.
188 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
189 { short_option, long_option, doc, help, options::One_option::dash, \
190 NULL, func, NULL, NULL, NULL }
191 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func) \
192 { short_option, long_option, doc, help, options::One_option::dash, \
193 NULL, NULL, func, NULL, NULL }
194 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func) \
195 { short_option, long_option, doc, help, options::One_option::dash, \
196 NULL, NULL, NULL, func, NULL }
197 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func) \
198 { short_option, long_option, doc, help, options::One_option::dash, \
199 NULL, NULL, NULL, NULL, func }
200 #define SPECIAL(short_option, long_option, doc, help, dash, func) \
201 { short_option, long_option, doc, help, options::One_option::dash, \
202 func, NULL, NULL, NULL, NULL }
204 // Here is the actual list of options which we accept.
206 const options::One_option
207 options::Command_line_options::options
[] =
209 SPECIAL('l', "library", N_("Search for library LIBNAME"),
210 N_("-lLIBNAME --library LIBNAME"), TWO_DASHES
,
212 GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
213 N_("-L DIR, --library-path DIR"), TWO_DASHES
,
214 &General_options::add_to_search_path
),
215 GENERAL_ARG('o', "output", N_("Set output file name"),
216 N_("-o FILE, --output FILE"), TWO_DASHES
,
217 &General_options::set_output_file_name
),
218 GENERAL_NOARG('r', NULL
, N_("Generate relocatable output"), NULL
,
219 ONE_DASH
, &General_options::set_relocatable
),
220 GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
221 NULL
, ONE_DASH
, &General_options::set_static
),
222 SPECIAL('\0', "help", N_("Report usage information"), NULL
,
226 const int options::Command_line_options::options_size
=
227 sizeof (options
) / sizeof (options
[0]);
229 // The default values for the general options.
231 General_options::General_options()
233 output_file_name_("a.out"),
234 is_relocatable_(false),
239 // The default values for the position dependent options.
241 Position_dependent_options::Position_dependent_options()
242 : do_static_search_(false)
246 // Construct a Command_line.
248 Command_line::Command_line()
252 // Process the command line options.
255 Command_line::process(int argc
, char** argv
)
257 const int options_size
= options::Command_line_options::options_size
;
258 const options::One_option
* options
=
259 options::Command_line_options::options
;
260 bool no_more_options
= false;
264 if (argv
[i
][0] != '-' || no_more_options
)
266 this->inputs_
.push_back(Input_argument(argv
[i
], false,
267 this->position_options_
));
272 // Option starting with '-'.
274 if (argv
[i
][1] == '-')
277 if (argv
[i
][2] == '\0')
279 no_more_options
= true;
284 // Look for a long option match.
285 char* opt
= argv
[i
] + dashes
;
288 char* arg
= strchr(opt
, '=');
291 else if (i
+ 1 < argc
)
298 for (j
= 0; j
< options_size
; ++j
)
300 if (options
[j
].long_option
!= NULL
303 != options::One_option::EXACTLY_TWO_DASHES
))
304 && first
== options
[j
].long_option
[0]
305 && strcmp(opt
, options
[j
].long_option
) == 0)
307 if (options
[j
].special
)
308 i
+= options
[j
].special(argc
- 1, argv
+ i
, opt
, this);
311 if (!options
[j
].takes_argument())
319 this->usage(_("missing argument"), argv
[i
]);
321 this->apply_option(options
[j
], arg
);
327 if (j
< options_size
)
330 // If we saw two dashes, we need to see a long option.
332 this->usage(_("unknown option"), argv
[i
]);
334 // Look for a short option match. There may be more than one
335 // short option in a given argument.
337 char* s
= argv
[i
] + 1;
339 while (*s
!= '\0' && !done
)
343 for (j
= 0; j
< options_size
; ++j
)
345 if (options
[j
].short_option
== opt
)
347 if (options
[j
].special
)
349 // Undo the argument skip done above.
351 i
+= options
[j
].special(argc
- i
, argv
+ i
, s
, this);
357 if (options
[j
].takes_argument())
370 this->usage(_("missing argument"), opt
);
372 this->apply_option(options
[j
], arg
);
378 if (j
>= options_size
)
379 this->usage(_("unknown option"), *s
);
385 // FIXME: We should only do this when configured in native mode.
386 this->options_
.add_to_search_path("/lib");
387 this->options_
.add_to_search_path("/usr/lib");
390 // Apply a command line option.
393 Command_line::apply_option(const options::One_option
& opt
,
398 if (opt
.general_noarg
)
399 (this->options_
.*(opt
.general_noarg
))();
400 else if (opt
.dependent_noarg
)
401 (this->position_options_
.*(opt
.dependent_noarg
))();
408 (this->options_
.*(opt
.general_arg
))(arg
);
409 else if (opt
.dependent_arg
)
410 (this->position_options_
.*(opt
.dependent_arg
))(arg
);
416 // Handle the -l option, which requires special treatment.
419 Command_line::process_l_option(int argc
, char** argv
, char* arg
)
431 libname
= argv
[argc
+ 1];
434 this->usage(_("missing argument"), arg
);
436 this->inputs_
.push_back(Input_argument(libname
, true,
437 this->position_options_
));
442 // Report a usage error. */
445 Command_line::usage()
448 _("%s: use the --help option for usage information\n"),
454 Command_line::usage(const char* msg
, const char *opt
)
458 program_name
, opt
, msg
);
463 Command_line::usage(const char* msg
, char opt
)
467 program_name
, opt
, msg
);
471 } // End namespace gold.
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