gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   5
   6 // This file is part of gold.
   7
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 3 of the License, or
  11 // (at your option) any later version.
  12
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the Free Software
  20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 // MA 02110-1301, USA.
  22
  23 #include "gold.h"
  24
  25 #include <cstdlib>
  26 #include <iostream>
  27 #include <sys/stat.h>
  28 #include "filenames.h"
  29 #include "libiberty.h"
  30
  31 #include "debug.h"
  32 #include "options.h"
  33
  34 namespace gold
  35 {
  36
  37 // The information we keep for a single command line option.
  38
  39 struct options::One_option
  40 {
  41   // The single character option name, or '\0' if this is only a long
  42   // option.
  43   char short_option;
  44
  45   // The long option name, or NULL if this is only a short option.
  46   const char* long_option;
  47
  48   // Description of the option for --help output, or NULL if there is none.
  49   const char* doc;
  50
  51   // How to print the option name in --help output, or NULL to use the
  52   // default.
  53   const char* help_output;
  54
  55   // Long option dash control.  This is ignored if long_option is
  56   // NULL.
  57   enum
  58     {
  59       // Long option normally takes one dash; two dashes are also
  60       // accepted.
  61       ONE_DASH,
  62       // Long option normally takes two dashes; one dash is also
  63       // accepted.
  64       TWO_DASHES,
  65       // Long option always takes two dashes.
  66       EXACTLY_TWO_DASHES
  67     } dash;
  68
  69   // Function for special handling, or NULL.  Returns the number of
  70   // arguments to skip.  This will normally be at least 1, but it may
  71   // be 0 if this function changes *argv.  ARG points to the location
  72   // in *ARGV where the option starts, which may be helpful for a
  73   // short option.
  74   int (*special)(int argc, char** argv, char *arg, bool long_option,
  75                  Command_line*);
  76
  77   // If this is a position independent option which does not take an
  78   // argument, this is the member function to call to record it.
  79   void (General_options::*general_noarg)();
  80
  81   // If this is a position independent function which takes an
  82   // argument, this is the member function to call to record it.
  83   void (General_options::*general_arg)(const char*);
  84
  85   // If this is a position dependent option which does not take an
  86   // argument, this is the member function to call to record it.
  87   void (Position_dependent_options::*dependent_noarg)();
  88
  89   // If this is a position dependent option which takes an argument,
  90   // this is the member function to record it.
  91   void (Position_dependent_options::*dependent_arg)(const char*);
  92
  93   // Return whether this option takes an argument.
  94   bool
  95   takes_argument() const
  96   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  97 };
  98
  99 // We have a separate table for -z options.
 100
 101 struct options::One_z_option
 102 {
 103   // The name of the option.
 104   const char* name;
 105
 106   // The member function in General_options called to record it.
 107   void (General_options::*set)();
 108 };
 109
 110 // We have a separate table for --debug options.
 111
 112 struct options::One_debug_option
 113 {
 114   // The name of the option.
 115   const char* name;
 116
 117   // The flags to turn on.
 118   unsigned int debug_flags;
 119 };
 120
 121 class options::Command_line_options
 122 {
 123  public:
 124   static const One_option options[];
 125   static const int options_size;
 126   static const One_z_option z_options[];
 127   static const int z_options_size;
 128   static const One_debug_option debug_options[];
 129   static const int debug_options_size;
 130 };
 131
 132 } // End namespace gold.
 133
 134 namespace
 135 {
 136
 137 // Handle the special -l option, which adds an input file.
 138
 139 int
 140 library(int argc, char** argv, char* arg, bool long_option,
 141         gold::Command_line* cmdline)
 142 {
 143   return cmdline->process_l_option(argc, argv, arg, long_option);
 144 }
 145
 146 // Handle the special -T/--script option, which reads a linker script.
 147
 148 int
 149 invoke_script(int argc, char** argv, char* arg, bool long_option,
 150               gold::Command_line* cmdline)
 151 {
 152   int ret;
 153   const char* script_name = cmdline->get_special_argument("script", argc, argv,
 154                                                           arg, long_option,
 155                                                           &ret);
 156   if (!read_commandline_script(script_name, cmdline))
 157     gold::gold_error(_("%s: unable to parse script file %s\n"),
 158                      gold::program_name, arg);
 159   return ret;
 160 }
 161
 162 // Handle the special --start-group option.
 163
 164 int
 165 start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 166 {
 167   cmdline->start_group(arg);
 168   return 1;
 169 }
 170
 171 // Handle the special --end-group option.
 172
 173 int
 174 end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 175 {
 176   cmdline->end_group(arg);
 177   return 1;
 178 }
 179
 180 // Report usage information for ld --help, and exit.
 181
 182 int
 183 help(int, char**, char*, bool, gold::Command_line*)
 184 {
 185   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 186
 187   const int options_size = gold::options::Command_line_options::options_size;
 188   const gold::options::One_option* options =
 189     gold::options::Command_line_options::options;
 190   for (int i = 0; i < options_size; ++i)
 191     {
 192       if (options[i].doc == NULL)
 193         continue;
 194
 195       printf("  ");
 196       int len = 2;
 197       bool comma = false;
 198
 199       int j = i;
 200       do
 201         {
 202           if (options[j].help_output != NULL)
 203             {
 204               if (comma)
 205                 {
 206                   printf(", ");
 207                   len += 2;
 208                 }
 209               printf(options[j].help_output);
 210               len += std::strlen(options[i].help_output);
 211               comma = true;
 212             }
 213           else
 214             {
 215               if (options[j].short_option != '\0')
 216                 {
 217                   if (comma)
 218                     {
 219                       printf(", ");
 220                       len += 2;
 221                     }
 222                   printf("-%c", options[j].short_option);
 223                   len += 2;
 224                   comma = true;
 225                 }
 226
 227               if (options[j].long_option != NULL)
 228                 {
 229                   if (comma)
 230                     {
 231                       printf(", ");
 232                       len += 2;
 233                     }
 234                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 235                     {
 236                       printf("-");
 237                       ++len;
 238                     }
 239                   else
 240                     {
 241                       printf("--");
 242                       len += 2;
 243                     }
 244                   printf("%s", options[j].long_option);
 245                   len += std::strlen(options[j].long_option);
 246                   comma = true;
 247                 }
 248             }
 249           ++j;
 250         }
 251       while (j < options_size && options[j].doc == NULL);
 252
 253       if (len >= 30)
 254         {
 255           printf("\n");
 256           len = 0;
 257         }
 258       for (; len < 30; ++len)
 259         std::putchar(' ');
 260
 261       std::puts(options[i].doc);
 262     }
 263
 264   ::exit(EXIT_SUCCESS);
 265
 266   return 0;
 267 }
 268
 269 // Report version information.
 270
 271 int
 272 version(int, char**, char* opt, bool, gold::Command_line*)
 273 {
 274   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 275   ::exit(EXIT_SUCCESS);
 276   return 0;
 277 }
 278
 279 // If the default sysroot is relocatable, try relocating it based on
 280 // the prefix FROM.
 281
 282 char*
 283 get_relative_sysroot(const char* from)
 284 {
 285   char* path = make_relative_prefix(gold::program_name, from,
 286                                     TARGET_SYSTEM_ROOT);
 287   if (path != NULL)
 288     {
 289       struct stat s;
 290       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 291         return path;
 292       free(path);
 293     }
 294
 295   return NULL;
 296 }
 297
 298 // Return the default sysroot.  This is set by the --with-sysroot
 299 // option to configure.
 300
 301 std::string
 302 get_default_sysroot()
 303 {
 304   const char* sysroot = TARGET_SYSTEM_ROOT;
 305   if (*sysroot == '\0')
 306     return "";
 307
 308   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 309     {
 310       char* path = get_relative_sysroot (BINDIR);
 311       if (path == NULL)
 312         path = get_relative_sysroot (TOOLBINDIR);
 313       if (path != NULL)
 314         {
 315           std::string ret = path;
 316           free(path);
 317           return ret;
 318         }
 319     }
 320
 321   return sysroot;
 322 }
 323
 324 } // End anonymous namespace.
 325
 326 namespace gold
 327 {
 328
 329 // Helper macros used to specify the options.  We could also do this
 330 // using constructors, but then g++ would generate code to initialize
 331 // the array.  We want the array to be initialized statically so that
 332 // we get better startup time.
 333
 334 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 335   { short_option, long_option, doc, help, options::One_option::dash, \
 336       NULL, func, NULL, NULL, NULL }
 337 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 338   { short_option, long_option, doc, help, options::One_option::dash, \
 339       NULL, NULL, func, NULL, NULL }
 340 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 341   { short_option, long_option, doc, help, options::One_option::dash, \
 342       NULL,  NULL, NULL, func, NULL }
 343 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 344   { short_option, long_option, doc, help, options::One_option::dash, \
 345       NULL, NULL, NULL, NULL, func }
 346 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 347   { short_option, long_option, doc, help, options::One_option::dash, \
 348       func, NULL, NULL, NULL, NULL }
 349
 350 // Here is the actual list of options which we accept.
 351
 352 const options::One_option
 353 options::Command_line_options::options[] =
 354 {
 355   GENERAL_NOARG('\0', "allow-shlib-undefined",
 356                 N_("Allow unresolved references in shared libraries"),
 357                 NULL, TWO_DASHES,
 358                 &General_options::set_allow_shlib_undefined),
 359   GENERAL_NOARG('\0', "no-allow-shlib-undefined",
 360                 N_("Do not allow unresolved references in shared libraries"),
 361                 NULL, TWO_DASHES,
 362                 &General_options::set_no_allow_shlib_undefined),
 363   POSDEP_NOARG('\0', "as-needed",
 364                N_("Only set DT_NEEDED for dynamic libs if used"),
 365                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 366   POSDEP_NOARG('\0', "no-as-needed",
 367                N_("Always DT_NEEDED for dynamic libs (default)"),
 368                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 369   POSDEP_NOARG('\0', "Bdynamic",
 370                N_("-l searches for shared libraries"),
 371                NULL, ONE_DASH,
 372                &Position_dependent_options::set_dynamic_search),
 373   POSDEP_NOARG('\0', "Bstatic",
 374                N_("-l does not search for shared libraries"),
 375                NULL, ONE_DASH,
 376                &Position_dependent_options::set_static_search),
 377   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 378                 NULL, ONE_DASH, &General_options::set_symbolic),
 379 #ifdef HAVE_ZLIB_H
 380 # define ZLIB_STR  ",zlib"
 381 #else
 382 # define ZLIB_STR  ""
 383 #endif
 384   GENERAL_ARG('\0', "compress-debug-sections",
 385               N_("Compress .debug_* sections in the output file "
 386                  "(default is none)"),
 387               N_("--compress-debug-sections=[none" ZLIB_STR "]"),
 388               TWO_DASHES,
 389               &General_options::set_compress_debug_sections),
 390   GENERAL_NOARG('\0', "demangle", N_("Demangle C++ symbols in log messages"),
 391                 NULL, TWO_DASHES, &General_options::set_demangle),
 392   GENERAL_NOARG('\0', "no-demangle",
 393                 N_("Do not demangle C++ symbols in log messages"),
 394                 NULL, TWO_DASHES, &General_options::clear_demangle),
 395   GENERAL_NOARG('\0', "detect-odr-violations",
 396                 N_("Try to detect violations of the One Definition Rule"),
 397                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 398   GENERAL_ARG('e', "entry", N_("Set program start address"),
 399               N_("-e ADDRESS, --entry ADDRESS"), TWO_DASHES,
 400               &General_options::set_entry),
 401   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 402                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 403   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 404                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 405   GENERAL_ARG('h', "soname", N_("Set shared library name"),
 406               N_("-h FILENAME, -soname FILENAME"), ONE_DASH,
 407               &General_options::set_soname),
 408   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 409               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 410               &General_options::set_dynamic_linker),
 411   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 412           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 413           &library),
 414   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 415               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 416               &General_options::add_to_search_path),
 417   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 418               &General_options::ignore),
 419   GENERAL_ARG('o', "output", N_("Set output file name"),
 420               N_("-o FILE, --output FILE"), TWO_DASHES,
 421               &General_options::set_output_file_name),
 422   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 423               N_("-O level"), ONE_DASH,
 424               &General_options::set_optimization_level),
 425   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 426                 ONE_DASH, &General_options::set_relocatable),
 427   GENERAL_ARG('R', "rpath", N_("Add DIR to runtime search path"),
 428               N_("-R DIR, -rpath DIR"), ONE_DASH,
 429               &General_options::add_to_rpath),
 430   GENERAL_ARG('\0', "rpath-link",
 431               N_("Add DIR to link time shared library search path"),
 432               N_("--rpath-link DIR"), TWO_DASHES,
 433               &General_options::add_to_rpath_link),
 434   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 435                 TWO_DASHES, &General_options::set_strip_all),
 436   GENERAL_NOARG('\0', "strip-debug-gdb",
 437                 N_("Strip debug symbols that are unused by gdb "
 438                    "(at least versions <= 6.7)"),
 439                 NULL, TWO_DASHES, &General_options::set_strip_debug_gdb),
 440   // This must come after -Sdebug since it's a prefix of it.
 441   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 442                 TWO_DASHES, &General_options::set_strip_debug),
 443   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 444                 NULL, ONE_DASH, &General_options::set_shared),
 445   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 446                 NULL, ONE_DASH, &General_options::set_static),
 447   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 448                 NULL, TWO_DASHES, &General_options::set_stats),
 449   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 450               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 451   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 452               N_("-Ttext ADDRESS"), ONE_DASH,
 453               &General_options::set_text_segment_address),
 454   // This must come after -Ttext since it's a prefix of it.
 455   SPECIAL('T', "script", N_("Read linker script"),
 456           N_("-T FILE, --script FILE"), TWO_DASHES,
 457           &invoke_script),
 458   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 459                 NULL, TWO_DASHES, &General_options::set_threads),
 460   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 461                 NULL, TWO_DASHES, &General_options::clear_threads),
 462   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 463               N_("--thread-count COUNT"), TWO_DASHES,
 464               &General_options::set_thread_count),
 465   GENERAL_ARG('\0', "thread-count-initial",
 466               N_("Number of threads to use in initial pass"),
 467               N_("--thread-count-initial COUNT"), TWO_DASHES,
 468               &General_options::set_thread_count_initial),
 469   GENERAL_ARG('\0', "thread-count-middle",
 470               N_("Number of threads to use in middle pass"),
 471               N_("--thread-count-middle COUNT"), TWO_DASHES,
 472               &General_options::set_thread_count_middle),
 473   GENERAL_ARG('\0', "thread-count-final",
 474               N_("Number of threads to use in final pass"),
 475               N_("--thread-count-final COUNT"), TWO_DASHES,
 476               &General_options::set_thread_count_final),
 477   POSDEP_NOARG('\0', "whole-archive",
 478                N_("Include all archive contents"),
 479                NULL, TWO_DASHES,
 480                &Position_dependent_options::set_whole_archive),
 481   POSDEP_NOARG('\0', "no-whole-archive",
 482                N_("Include only needed archive contents"),
 483                NULL, TWO_DASHES,
 484                &Position_dependent_options::clear_whole_archive),
 485
 486   GENERAL_ARG('z', NULL,
 487               N_("Subcommands as follows:\n\
 488     -z execstack              Mark output as requiring executable stack\n\
 489     -z noexecstack            Mark output as not requiring executable stack"),
 490               N_("-z SUBCOMMAND"), ONE_DASH,
 491               &General_options::handle_z_option),
 492
 493   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 494           TWO_DASHES, &start_group),
 495   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 496           TWO_DASHES, &end_group),
 497   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 498           TWO_DASHES, &help),
 499   SPECIAL('v', "version", N_("Report version information"), NULL,
 500           TWO_DASHES, &version),
 501   GENERAL_ARG('\0', "debug", N_("Turn on debugging (all,task)"),
 502               N_("--debug=TYPE"), TWO_DASHES,
 503               &General_options::handle_debug_option)
 504 };
 505
 506 const int options::Command_line_options::options_size =
 507   sizeof (options) / sizeof (options[0]);
 508
 509 // The -z options.
 510
 511 const options::One_z_option
 512 options::Command_line_options::z_options[] =
 513 {
 514   { "execstack", &General_options::set_execstack },
 515   { "noexecstack", &General_options::set_noexecstack },
 516 };
 517
 518 const int options::Command_line_options::z_options_size =
 519   sizeof(z_options) / sizeof(z_options[0]);
 520
 521 // The --debug options.
 522
 523 const options::One_debug_option
 524 options::Command_line_options::debug_options[] =
 525 {
 526   { "all", DEBUG_ALL },
 527   { "task", DEBUG_TASK },
 528 };
 529
 530 const int options::Command_line_options::debug_options_size =
 531   sizeof(debug_options) / sizeof(debug_options[0]);
 532
 533 // The default values for the general options.
 534
 535 General_options::General_options()
 536   : entry_(NULL),
 537     export_dynamic_(false),
 538     soname_(NULL),
 539     dynamic_linker_(NULL),
 540     search_path_(),
 541     optimization_level_(0),
 542     output_file_name_("a.out"),
 543     is_relocatable_(false),
 544     strip_(STRIP_NONE),
 545     allow_shlib_undefined_(false),
 546     symbolic_(false),
 547     compress_debug_sections_(NO_COMPRESSION),
 548     detect_odr_violations_(false),
 549     create_eh_frame_hdr_(false),
 550     rpath_(),
 551     rpath_link_(),
 552     is_shared_(false),
 553     is_static_(false),
 554     print_stats_(false),
 555     sysroot_(),
 556     text_segment_address_(-1U),   // -1 indicates value not set by user
 557     threads_(false),
 558     thread_count_initial_(0),
 559     thread_count_middle_(0),
 560     thread_count_final_(0),
 561     execstack_(EXECSTACK_FROM_INPUT),
 562     debug_(0)
 563 {
 564   // We initialize demangle_ based on the environment variable
 565   // COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
 566   // output of the linker, unless COLLECT_NO_DEMANGLE is set in the
 567   // environment.  Acting the same way here lets us provide the same
 568   // interface by default.
 569   this->demangle_ = getenv("COLLECT_NO_DEMANGLE") == NULL;
 570 }
 571
 572 // The default values for the position dependent options.
 573
 574 Position_dependent_options::Position_dependent_options()
 575   : do_static_search_(false),
 576     as_needed_(false),
 577     include_whole_archive_(false)
 578 {
 579 }
 580
 581 // Handle the -z option.
 582
 583 void
 584 General_options::handle_z_option(const char* arg)
 585 {
 586   const int z_options_size = options::Command_line_options::z_options_size;
 587   const gold::options::One_z_option* z_options =
 588     gold::options::Command_line_options::z_options;
 589   for (int i = 0; i < z_options_size; ++i)
 590     {
 591       if (strcmp(arg, z_options[i].name) == 0)
 592         {
 593           (this->*(z_options[i].set))();
 594           return;
 595         }
 596     }
 597
 598   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 599           program_name, arg);
 600   ::exit(EXIT_FAILURE);
 601 }
 602
 603 // Handle the --debug option.
 604
 605 void
 606 General_options::handle_debug_option(const char* arg)
 607 {
 608   const int debug_options_size =
 609     options::Command_line_options::debug_options_size;
 610   const gold::options::One_debug_option* debug_options =
 611     options::Command_line_options::debug_options;
 612   for (int i = 0; i < debug_options_size; ++i)
 613     {
 614       if (strcmp(arg, debug_options[i].name) == 0)
 615         {
 616           this->set_debug(debug_options[i].debug_flags);
 617           return;
 618         }
 619     }
 620
 621   fprintf(stderr, _("%s: unrecognized --debug subcommand: %s\n"),
 622           program_name, arg);
 623   ::exit(EXIT_FAILURE);
 624 }
 625
 626 // Add the sysroot, if any, to the search paths.
 627
 628 void
 629 General_options::add_sysroot()
 630 {
 631   if (this->sysroot_.empty())
 632     {
 633       this->sysroot_ = get_default_sysroot();
 634       if (this->sysroot_.empty())
 635         return;
 636     }
 637
 638   const char* sysroot = this->sysroot_.c_str();
 639   char* canonical_sysroot = lrealpath(sysroot);
 640
 641   for (Dir_list::iterator p = this->search_path_.begin();
 642        p != this->search_path_.end();
 643        ++p)
 644     p->add_sysroot(sysroot, canonical_sysroot);
 645
 646   free(canonical_sysroot);
 647 }
 648
 649 // Search_directory methods.
 650
 651 // This is called if we have a sysroot.  Apply the sysroot if
 652 // appropriate.  Record whether the directory is in the sysroot.
 653
 654 void
 655 Search_directory::add_sysroot(const char* sysroot,
 656                               const char* canonical_sysroot)
 657 {
 658   gold_assert(*sysroot != '\0');
 659   if (this->put_in_sysroot_)
 660     {
 661       if (!IS_DIR_SEPARATOR(this->name_[0])
 662           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 663         this->name_ = '/' + this->name_;
 664       this->name_ = sysroot + this->name_;
 665       this->is_in_sysroot_ = true;
 666     }
 667   else
 668     {
 669       // Check whether this entry is in the sysroot.  To do this
 670       // correctly, we need to use canonical names.  Otherwise we will
 671       // get confused by the ../../.. paths that gcc tends to use.
 672       char* canonical_name = lrealpath(this->name_.c_str());
 673       int canonical_name_len = strlen(canonical_name);
 674       int canonical_sysroot_len = strlen(canonical_sysroot);
 675       if (canonical_name_len > canonical_sysroot_len
 676           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 677         {
 678           canonical_name[canonical_sysroot_len] = '\0';
 679           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 680             this->is_in_sysroot_ = true;
 681         }
 682       free(canonical_name);
 683     }
 684 }
 685
 686 // Input_arguments methods.
 687
 688 // Add a file to the list.
 689
 690 void
 691 Input_arguments::add_file(const Input_file_argument& file)
 692 {
 693   if (!this->in_group_)
 694     this->input_argument_list_.push_back(Input_argument(file));
 695   else
 696     {
 697       gold_assert(!this->input_argument_list_.empty());
 698       gold_assert(this->input_argument_list_.back().is_group());
 699       this->input_argument_list_.back().group()->add_file(file);
 700     }
 701 }
 702
 703 // Start a group.
 704
 705 void
 706 Input_arguments::start_group()
 707 {
 708   gold_assert(!this->in_group_);
 709   Input_file_group* group = new Input_file_group();
 710   this->input_argument_list_.push_back(Input_argument(group));
 711   this->in_group_ = true;
 712 }
 713
 714 // End a group.
 715
 716 void
 717 Input_arguments::end_group()
 718 {
 719   gold_assert(this->in_group_);
 720   this->in_group_ = false;
 721 }
 722
 723 // Command_line options.
 724
 725 Command_line::Command_line()
 726   : options_(), position_options_(), inputs_()
 727 {
 728 }
 729
 730 // Process the command line options.  For process_one_option,
 731 // i is the index of argv to process next, and the return value
 732 // is the index of the next option to process (i+1 or i+2, or argc
 733 // to indicate processing is done).  no_more_options is set to true
 734 // if (and when) "--" is seen as an option.
 735
 736 int
 737 Command_line::process_one_option(int argc, char** argv, int i,
 738                                  bool* no_more_options)
 739 {
 740   const int options_size = options::Command_line_options::options_size;
 741   const options::One_option* options = options::Command_line_options::options;
 742   gold_assert(i < argc);
 743
 744   if (argv[i][0] != '-' || *no_more_options)
 745     {
 746       this->add_file(argv[i], false);
 747       return i + 1;
 748     }
 749
 750   // Option starting with '-'.
 751   int dashes = 1;
 752   if (argv[i][1] == '-')
 753     {
 754       dashes = 2;
 755       if (argv[i][2] == '\0')
 756         {
 757           *no_more_options = true;
 758           return i + 1;
 759         }
 760     }
 761
 762   // Look for a long option match.
 763   char* opt = argv[i] + dashes;
 764   char first = opt[0];
 765   int skiparg = 0;
 766   char* arg = strchr(opt, '=');
 767   bool argument_with_equals = arg != NULL;
 768   if (arg != NULL)
 769     {
 770       *arg = '\0';
 771       ++arg;
 772     }
 773   else if (i + 1 < argc)
 774     {
 775       arg = argv[i + 1];
 776       skiparg = 1;
 777     }
 778
 779   int j;
 780   for (j = 0; j < options_size; ++j)
 781     {
 782       if (options[j].long_option != NULL
 783           && (dashes == 2
 784           || (options[j].dash
 785               != options::One_option::EXACTLY_TWO_DASHES))
 786           && first == options[j].long_option[0]
 787           && strcmp(opt, options[j].long_option) == 0)
 788         {
 789           if (options[j].special)
 790             {
 791               // Restore the '=' we clobbered above.
 792               if (arg != NULL && skiparg == 0)
 793                 arg[-1] = '=';
 794               i += options[j].special(argc - i, argv + i, opt, true, this);
 795             }
 796           else
 797             {
 798               if (!options[j].takes_argument())
 799                 {
 800                   if (argument_with_equals)
 801                     this->usage(_("unexpected argument"), argv[i]);
 802                   arg = NULL;
 803                   skiparg = 0;
 804                 }
 805               else
 806                 {
 807                   if (arg == NULL)
 808                     this->usage(_("missing argument"), argv[i]);
 809                 }
 810               this->apply_option(options[j], arg);
 811               i += skiparg + 1;
 812             }
 813           break;
 814         }
 815     }
 816   if (j < options_size)
 817     return i;
 818
 819   // If we saw two dashes, we needed to have seen a long option.
 820   if (dashes == 2)
 821     this->usage(_("unknown option"), argv[i]);
 822
 823   // Look for a short option match.  There may be more than one
 824   // short option in a given argument.
 825   bool done = false;
 826   char* s = argv[i] + 1;
 827   ++i;
 828   while (*s != '\0' && !done)
 829     {
 830       char opt = *s;
 831       int j;
 832       for (j = 0; j < options_size; ++j)
 833         {
 834           if (options[j].short_option == opt)
 835             {
 836               if (options[j].special)
 837                 {
 838                   // Undo the argument skip done above.
 839                   --i;
 840                   i += options[j].special(argc - i, argv + i, s, false,
 841                                           this);
 842                   done = true;
 843                 }
 844               else
 845                 {
 846                   arg = NULL;
 847                   if (options[j].takes_argument())
 848                     {
 849                       if (s[1] != '\0')
 850                         {
 851                           arg = s + 1;
 852                           done = true;
 853                         }
 854                       else if (i < argc)
 855                         {
 856                           arg = argv[i];
 857                           ++i;
 858                         }
 859                       else
 860                         this->usage(_("missing argument"), opt);
 861                     }
 862                   this->apply_option(options[j], arg);
 863                 }
 864               break;
 865             }
 866         }
 867
 868       if (j >= options_size)
 869         this->usage(_("unknown option"), *s);
 870
 871       ++s;
 872     }
 873   return i;
 874 }
 875
 876
 877 void
 878 Command_line::process(int argc, char** argv)
 879 {
 880   bool no_more_options = false;
 881   int i = 0;
 882   while (i < argc)
 883     i = process_one_option(argc, argv, i, &no_more_options);
 884
 885   if (this->inputs_.in_group())
 886     {
 887       fprintf(stderr, _("%s: missing group end\n"), program_name);
 888       this->usage();
 889     }
 890
 891   // FIXME: We should only do this when configured in native mode.
 892   this->options_.add_to_search_path_with_sysroot("/lib");
 893   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 894
 895   this->options_.add_sysroot();
 896
 897   // Ensure options don't contradict each other and are otherwise kosher.
 898   this->normalize_options();
 899 }
 900
 901 // Extract an option argument for a special option.  LONGNAME is the
 902 // long name of the option.  This sets *PRET to the return value for
 903 // the special function handler to skip to the next option.
 904
 905 const char*
 906 Command_line::get_special_argument(const char* longname, int argc, char** argv,
 907                                    const char* arg, bool long_option,
 908                                    int *pret)
 909 {
 910   if (long_option)
 911     {
 912       size_t longlen = strlen(longname);
 913       gold_assert(strncmp(arg, longname, longlen) == 0);
 914       arg += longlen;
 915       if (*arg == '=')
 916         {
 917           *pret = 1;
 918           return arg + 1;
 919         }
 920       else if (argc > 1)
 921         {
 922           gold_assert(*arg == '\0');
 923           *pret = 2;
 924           return argv[1];
 925         }
 926     }
 927   else
 928     {
 929       if (arg[1] != '\0')
 930         {
 931           *pret = 1;
 932           return arg + 1;
 933         }
 934       else if (argc > 1)
 935         {
 936           *pret = 2;
 937           return argv[1];
 938         }
 939     }
 940
 941   this->usage(_("missing argument"), arg);
 942 }
 943
 944 // Ensure options don't contradict each other and are otherwise kosher.
 945
 946 void
 947 Command_line::normalize_options()
 948 {
 949   // If the user specifies both -s and -r, convert the -s as -S.
 950   // -r requires us to keep externally visible symbols!
 951   if (this->options_.strip_all() && this->options_.is_relocatable())
 952     {
 953       // Clears the strip_all() status, replacing it with strip_debug().
 954       this->options_.set_strip_debug();
 955     }
 956
 957   // FIXME: we can/should be doing a lot more sanity checking here.
 958 }
 959
 960
 961 // Apply a command line option.
 962
 963 void
 964 Command_line::apply_option(const options::One_option& opt,
 965                            const char* arg)
 966 {
 967   if (arg == NULL)
 968     {
 969       if (opt.general_noarg)
 970         (this->options_.*(opt.general_noarg))();
 971       else if (opt.dependent_noarg)
 972         (this->position_options_.*(opt.dependent_noarg))();
 973       else
 974         gold_unreachable();
 975     }
 976   else
 977     {
 978       if (opt.general_arg)
 979         (this->options_.*(opt.general_arg))(arg);
 980       else if (opt.dependent_arg)
 981         (this->position_options_.*(opt.dependent_arg))(arg);
 982       else
 983         gold_unreachable();
 984     }
 985 }
 986
 987 // Add an input file or library.
 988
 989 void
 990 Command_line::add_file(const char* name, bool is_lib)
 991 {
 992   Input_file_argument file(name, is_lib, "", this->position_options_);
 993   this->inputs_.add_file(file);
 994 }
 995
 996 // Handle the -l option, which requires special treatment.
 997
 998 int
 999 Command_line::process_l_option(int argc, char** argv, char* arg,
1000                                bool long_option)
1001 {
1002   int ret;
1003   const char* libname = this->get_special_argument("library", argc, argv, arg,
1004                                                    long_option, &ret);
1005   this->add_file(libname, true);
1006   return ret;
1007 }
1008
1009 // Handle the --start-group option.
1010
1011 void
1012 Command_line::start_group(const char* arg)
1013 {
1014   if (this->inputs_.in_group())
1015     this->usage(_("may not nest groups"), arg);
1016   this->inputs_.start_group();
1017 }
1018
1019 // Handle the --end-group option.
1020
1021 void
1022 Command_line::end_group(const char* arg)
1023 {
1024   if (!this->inputs_.in_group())
1025     this->usage(_("group end without group start"), arg);
1026   this->inputs_.end_group();
1027 }
1028
1029 // Report a usage error.  */
1030
1031 void
1032 Command_line::usage()
1033 {
1034   fprintf(stderr,
1035           _("%s: use the --help option for usage information\n"),
1036           program_name);
1037   ::exit(EXIT_FAILURE);
1038 }
1039
1040 void
1041 Command_line::usage(const char* msg, const char *opt)
1042 {
1043   fprintf(stderr,
1044           _("%s: %s: %s\n"),
1045           program_name, opt, msg);
1046   this->usage();
1047 }
1048
1049 void
1050 Command_line::usage(const char* msg, char opt)
1051 {
1052   fprintf(stderr,
1053           _("%s: -%c: %s\n"),
1054           program_name, opt, msg);
1055   this->usage();
1056 }
1057
1058 } // End namespace gold.