gold/options.cc

   1 // options.c -- handle command line options for gold
   2
   3 // Copyright 2006, 2007, 2008 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 "script.h"
  33 #include "options.h"
  34
  35 namespace gold
  36 {
  37
  38 // The information we keep for a single command line option.
  39
  40 struct options::One_option
  41 {
  42   // The single character option name, or '\0' if this is only a long
  43   // option.
  44   char short_option;
  45
  46   // The long option name, or NULL if this is only a short option.
  47   const char* long_option;
  48
  49   // Description of the option for --help output, or NULL if there is none.
  50   const char* doc;
  51
  52   // How to print the option name in --help output, or NULL to use the
  53   // default.
  54   const char* help_output;
  55
  56   // Long option dash control.  This is ignored if long_option is
  57   // NULL.
  58   enum
  59     {
  60       // Long option normally takes one dash; two dashes are also
  61       // accepted.
  62       ONE_DASH,
  63       // Long option normally takes two dashes; one dash is also
  64       // accepted.
  65       TWO_DASHES,
  66       // Long option always takes two dashes.
  67       EXACTLY_TWO_DASHES
  68     } dash;
  69
  70   // Function for special handling, or NULL.  Returns the number of
  71   // arguments to skip.  This will normally be at least 1, but it may
  72   // be 0 if this function changes *argv.  ARG points to the location
  73   // in *ARGV where the option starts, which may be helpful for a
  74   // short option.
  75   int (*special)(int argc, char** argv, char *arg, bool long_option,
  76                  Command_line*);
  77
  78   // If this is a position independent option which does not take an
  79   // argument, this is the member function to call to record it.
  80   void (General_options::*general_noarg)();
  81
  82   // If this is a position independent function which takes an
  83   // argument, this is the member function to call to record it.
  84   void (General_options::*general_arg)(const char*);
  85
  86   // If this is a position dependent option which does not take an
  87   // argument, this is the member function to call to record it.
  88   void (Position_dependent_options::*dependent_noarg)();
  89
  90   // If this is a position dependent option which takes an argument,
  91   // this is the member function to record it.
  92   void (Position_dependent_options::*dependent_arg)(const char*);
  93
  94   // Return whether this option takes an argument.
  95   bool
  96   takes_argument() const
  97   { return this->general_arg != NULL || this->dependent_arg != NULL; }
  98 };
  99
 100 // We have a separate table for -z options.
 101
 102 struct options::One_z_option
 103 {
 104   // The name of the option.
 105   const char* name;
 106
 107   // The member function in General_options called to record it.
 108   void (General_options::*set)();
 109 };
 110
 111 // We have a separate table for --debug options.
 112
 113 struct options::One_debug_option
 114 {
 115   // The name of the option.
 116   const char* name;
 117
 118   // The flags to turn on.
 119   unsigned int debug_flags;
 120 };
 121
 122 class options::Command_line_options
 123 {
 124  public:
 125   static const One_option options[];
 126   static const int options_size;
 127   static const One_z_option z_options[];
 128   static const int z_options_size;
 129   static const One_debug_option debug_options[];
 130   static const int debug_options_size;
 131 };
 132
 133 } // End namespace gold.
 134
 135 namespace
 136 {
 137
 138 // Handle the special -l option, which adds an input file.
 139
 140 int
 141 library(int argc, char** argv, char* arg, bool long_option,
 142         gold::Command_line* cmdline)
 143 {
 144   return cmdline->process_l_option(argc, argv, arg, long_option);
 145 }
 146
 147 // Handle the -R option.  Historically the GNU linker made -R a
 148 // synonym for --just-symbols.  ELF linkers have traditionally made -R
 149 // a synonym for -rpath.  When ELF support was added to the GNU
 150 // linker, -R was changed to switch based on the argument: if the
 151 // argument is an ordinary file, we treat it as --just-symbols,
 152 // otherwise we treat it as -rpath.  We need to be compatible with
 153 // this, because existing build scripts rely on it.
 154
 155 int
 156 handle_r_option(int argc, char** argv, char* arg, bool long_option,
 157                 gold::Command_line* cmdline)
 158 {
 159   int ret;
 160   const char* val = cmdline->get_special_argument("R", argc, argv, arg,
 161                                                   long_option, &ret);
 162   struct stat s;
 163   if (::stat(val, &s) != 0 || S_ISDIR(s.st_mode))
 164     cmdline->add_to_rpath(val);
 165   else
 166     cmdline->add_just_symbols_file(val);
 167   return ret;
 168 }
 169
 170 // Handle the --just-symbols option.
 171
 172 int
 173 handle_just_symbols_option(int argc, char** argv, char* arg,
 174                            bool long_option, gold::Command_line* cmdline)
 175 {
 176   int ret;
 177   const char* val = cmdline->get_special_argument("just-symbols", argc, argv,
 178                                                   arg, long_option, &ret);
 179   cmdline->add_just_symbols_file(val);
 180   return ret;
 181 }
 182
 183 // Handle the special -T/--script option, which reads a linker script.
 184
 185 int
 186 invoke_script(int argc, char** argv, char* arg, bool long_option,
 187               gold::Command_line* cmdline)
 188 {
 189   int ret;
 190   const char* script_name = cmdline->get_special_argument("script", argc, argv,
 191                                                           arg, long_option,
 192                                                           &ret);
 193   if (!read_commandline_script(script_name, cmdline))
 194     gold::gold_fatal(_("unable to parse script file %s"), script_name);
 195   return ret;
 196 }
 197
 198 // Handle the special --version-script option, which reads a version script.
 199
 200 int
 201 invoke_version_script(int argc, char** argv, char* arg, bool long_option,
 202                       gold::Command_line* cmdline)
 203 {
 204   int ret;
 205   const char* script_name = cmdline->get_special_argument("version-script",
 206                                                           argc, argv,
 207                                                           arg, long_option,
 208                                                           &ret);
 209   if (!read_version_script(script_name, cmdline))
 210     gold::gold_fatal(_("unable to parse version script file %s"), script_name);
 211   return ret;
 212 }
 213
 214 // Handle the special --start-group option.
 215
 216 int
 217 start_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 218 {
 219   cmdline->start_group(arg);
 220   return 1;
 221 }
 222
 223 // Handle the special --end-group option.
 224
 225 int
 226 end_group(int, char**, char* arg, bool, gold::Command_line* cmdline)
 227 {
 228   cmdline->end_group(arg);
 229   return 1;
 230 }
 231
 232 // Report usage information for ld --help, and exit.
 233
 234 int
 235 help(int, char**, char*, bool, gold::Command_line*)
 236 {
 237   printf(_("Usage: %s [options] file...\nOptions:\n"), gold::program_name);
 238
 239   const int options_size = gold::options::Command_line_options::options_size;
 240   const gold::options::One_option* options =
 241     gold::options::Command_line_options::options;
 242   for (int i = 0; i < options_size; ++i)
 243     {
 244       if (options[i].doc == NULL)
 245         continue;
 246
 247       printf("  ");
 248       int len = 2;
 249       bool comma = false;
 250
 251       int j = i;
 252       do
 253         {
 254           if (options[j].help_output != NULL)
 255             {
 256               if (comma)
 257                 {
 258                   printf(", ");
 259                   len += 2;
 260                 }
 261               printf(options[j].help_output);
 262               len += std::strlen(options[j].help_output);
 263               comma = true;
 264             }
 265           else
 266             {
 267               if (options[j].short_option != '\0')
 268                 {
 269                   if (comma)
 270                     {
 271                       printf(", ");
 272                       len += 2;
 273                     }
 274                   printf("-%c", options[j].short_option);
 275                   len += 2;
 276                   comma = true;
 277                 }
 278
 279               if (options[j].long_option != NULL)
 280                 {
 281                   if (comma)
 282                     {
 283                       printf(", ");
 284                       len += 2;
 285                     }
 286                   if (options[j].dash == gold::options::One_option::ONE_DASH)
 287                     {
 288                       printf("-");
 289                       ++len;
 290                     }
 291                   else
 292                     {
 293                       printf("--");
 294                       len += 2;
 295                     }
 296                   printf("%s", options[j].long_option);
 297                   len += std::strlen(options[j].long_option);
 298                   comma = true;
 299                 }
 300             }
 301           ++j;
 302         }
 303       while (j < options_size && options[j].doc == NULL);
 304
 305       if (len >= 30)
 306         {
 307           printf("\n");
 308           len = 0;
 309         }
 310       for (; len < 30; ++len)
 311         std::putchar(' ');
 312
 313       std::puts(options[i].doc);
 314     }
 315
 316   ::exit(EXIT_SUCCESS);
 317
 318   return 0;
 319 }
 320
 321 // Report version information.
 322
 323 int
 324 version(int, char**, char* opt, bool, gold::Command_line*)
 325 {
 326   gold::print_version(opt[0] == 'v' && opt[1] == '\0');
 327   ::exit(EXIT_SUCCESS);
 328   return 0;
 329 }
 330
 331 // If the default sysroot is relocatable, try relocating it based on
 332 // the prefix FROM.
 333
 334 char*
 335 get_relative_sysroot(const char* from)
 336 {
 337   char* path = make_relative_prefix(gold::program_name, from,
 338                                     TARGET_SYSTEM_ROOT);
 339   if (path != NULL)
 340     {
 341       struct stat s;
 342       if (::stat(path, &s) == 0 && S_ISDIR(s.st_mode))
 343         return path;
 344       free(path);
 345     }
 346
 347   return NULL;
 348 }
 349
 350 // Return the default sysroot.  This is set by the --with-sysroot
 351 // option to configure.
 352
 353 std::string
 354 get_default_sysroot()
 355 {
 356   const char* sysroot = TARGET_SYSTEM_ROOT;
 357   if (*sysroot == '\0')
 358     return "";
 359
 360   if (TARGET_SYSTEM_ROOT_RELOCATABLE)
 361     {
 362       char* path = get_relative_sysroot (BINDIR);
 363       if (path == NULL)
 364         path = get_relative_sysroot (TOOLBINDIR);
 365       if (path != NULL)
 366         {
 367           std::string ret = path;
 368           free(path);
 369           return ret;
 370         }
 371     }
 372
 373   return sysroot;
 374 }
 375
 376 } // End anonymous namespace.
 377
 378 namespace gold
 379 {
 380
 381 // Helper macros used to specify the options.  We could also do this
 382 // using constructors, but then g++ would generate code to initialize
 383 // the array.  We want the array to be initialized statically so that
 384 // we get better startup time.
 385
 386 #define GENERAL_NOARG(short_option, long_option, doc, help, dash, func) \
 387   { short_option, long_option, doc, help, options::One_option::dash, \
 388       NULL, func, NULL, NULL, NULL }
 389 #define GENERAL_ARG(short_option, long_option, doc, help, dash, func)   \
 390   { short_option, long_option, doc, help, options::One_option::dash, \
 391       NULL, NULL, func, NULL, NULL }
 392 #define POSDEP_NOARG(short_option, long_option, doc, help, dash, func)  \
 393   { short_option, long_option, doc, help, options::One_option::dash, \
 394       NULL,  NULL, NULL, func, NULL }
 395 #define POSDEP_ARG(short_option, long_option, doc, help, dash, func)    \
 396   { short_option, long_option, doc, help, options::One_option::dash, \
 397       NULL, NULL, NULL, NULL, func }
 398 #define SPECIAL(short_option, long_option, doc, help, dash, func)       \
 399   { short_option, long_option, doc, help, options::One_option::dash, \
 400       func, NULL, NULL, NULL, NULL }
 401
 402 // Here is the actual list of options which we accept.
 403
 404 const options::One_option
 405 options::Command_line_options::options[] =
 406 {
 407   GENERAL_NOARG('\0', "allow-shlib-undefined",
 408                 N_("Allow unresolved references in shared libraries"),
 409                 NULL, TWO_DASHES,
 410                 &General_options::set_allow_shlib_undefined),
 411   GENERAL_NOARG('\0', "no-allow-shlib-undefined",
 412                 N_("Do not allow unresolved references in shared libraries"),
 413                 NULL, TWO_DASHES,
 414                 &General_options::set_no_allow_shlib_undefined),
 415   POSDEP_NOARG('\0', "as-needed",
 416                N_("Only set DT_NEEDED for dynamic libs if used"),
 417                NULL, TWO_DASHES, &Position_dependent_options::set_as_needed),
 418   POSDEP_NOARG('\0', "no-as-needed",
 419                N_("Always DT_NEEDED for dynamic libs (default)"),
 420                NULL, TWO_DASHES, &Position_dependent_options::clear_as_needed),
 421   POSDEP_NOARG('\0', "Bdynamic",
 422                N_("-l searches for shared libraries"),
 423                NULL, ONE_DASH,
 424                &Position_dependent_options::set_dynamic_search),
 425   POSDEP_NOARG('\0', "Bstatic",
 426                N_("-l does not search for shared libraries"),
 427                NULL, ONE_DASH,
 428                &Position_dependent_options::set_static_search),
 429   GENERAL_NOARG('\0', "Bsymbolic", N_("Bind defined symbols locally"),
 430                 NULL, ONE_DASH, &General_options::set_symbolic),
 431 #ifdef HAVE_ZLIB_H
 432 # define ZLIB_STR  ",zlib"
 433 #else
 434 # define ZLIB_STR  ""
 435 #endif
 436   GENERAL_ARG('\0', "compress-debug-sections",
 437               N_("Compress .debug_* sections in the output file "
 438                  "(default is none)"),
 439               N_("--compress-debug-sections=[none" ZLIB_STR "]"),
 440               TWO_DASHES,
 441               &General_options::set_compress_debug_sections),
 442   GENERAL_ARG('\0', "defsym", N_("Define a symbol"),
 443               N_("--defsym SYMBOL=EXPRESSION"), TWO_DASHES,
 444               &General_options::define_symbol),
 445   GENERAL_NOARG('\0', "demangle", N_("Demangle C++ symbols in log messages"),
 446                 NULL, TWO_DASHES, &General_options::set_demangle),
 447   GENERAL_NOARG('\0', "no-demangle",
 448                 N_("Do not demangle C++ symbols in log messages"),
 449                 NULL, TWO_DASHES, &General_options::clear_demangle),
 450   GENERAL_NOARG('\0', "detect-odr-violations",
 451                 N_("Try to detect violations of the One Definition Rule"),
 452                 NULL, TWO_DASHES, &General_options::set_detect_odr_violations),
 453   GENERAL_ARG('e', "entry", N_("Set program start address"),
 454               N_("-e ADDRESS, --entry ADDRESS"), TWO_DASHES,
 455               &General_options::set_entry),
 456   GENERAL_NOARG('E', "export-dynamic", N_("Export all dynamic symbols"),
 457                 NULL, TWO_DASHES, &General_options::set_export_dynamic),
 458   GENERAL_NOARG('\0', "eh-frame-hdr", N_("Create exception frame header"),
 459                 NULL, TWO_DASHES, &General_options::set_create_eh_frame_hdr),
 460   GENERAL_ARG('h', "soname", N_("Set shared library name"),
 461               N_("-h FILENAME, -soname FILENAME"), ONE_DASH,
 462               &General_options::set_soname),
 463   GENERAL_ARG('I', "dynamic-linker", N_("Set dynamic linker path"),
 464               N_("-I PROGRAM, --dynamic-linker PROGRAM"), TWO_DASHES,
 465               &General_options::set_dynamic_linker),
 466   SPECIAL('l', "library", N_("Search for library LIBNAME"),
 467           N_("-lLIBNAME, --library LIBNAME"), TWO_DASHES,
 468           &library),
 469   GENERAL_ARG('L', "library-path", N_("Add directory to search path"),
 470               N_("-L DIR, --library-path DIR"), TWO_DASHES,
 471               &General_options::add_to_search_path),
 472   GENERAL_ARG('m', NULL, N_("Ignored for compatibility"), NULL, ONE_DASH,
 473               &General_options::ignore),
 474   GENERAL_ARG('o', "output", N_("Set output file name"),
 475               N_("-o FILE, --output FILE"), TWO_DASHES,
 476               &General_options::set_output_file_name),
 477   GENERAL_ARG('O', NULL, N_("Optimize output file size"),
 478               N_("-O level"), ONE_DASH,
 479               &General_options::set_optimization_level),
 480   GENERAL_ARG('\0', "oformat", N_("Set output format (only binary supported)"),
 481               N_("--oformat FORMAT"), EXACTLY_TWO_DASHES,
 482               &General_options::set_output_format),
 483   GENERAL_NOARG('r', NULL, N_("Generate relocatable output"), NULL,
 484                 ONE_DASH, &General_options::set_relocatable),
 485   // -R really means -rpath, but can mean --just-symbols for
 486   // compatibility with GNU ld.  -rpath is always -rpath, so we list
 487   // it separately.
 488   SPECIAL('R', NULL, N_("Add DIR to runtime search path"),
 489           N_("-R DIR"), ONE_DASH, &handle_r_option),
 490   GENERAL_ARG('\0', "rpath", NULL, N_("-rpath DIR"), ONE_DASH,
 491               &General_options::add_to_rpath),
 492   SPECIAL('\0', "just-symbols", N_("Read only symbol values from file"),
 493           N_("-R FILE, --just-symbols FILE"), TWO_DASHES,
 494           &handle_just_symbols_option),
 495   GENERAL_ARG('\0', "rpath-link",
 496               N_("Add DIR to link time shared library search path"),
 497               N_("--rpath-link DIR"), TWO_DASHES,
 498               &General_options::add_to_rpath_link),
 499   GENERAL_NOARG('s', "strip-all", N_("Strip all symbols"), NULL,
 500                 TWO_DASHES, &General_options::set_strip_all),
 501   GENERAL_NOARG('\0', "strip-debug-gdb",
 502                 N_("Strip debug symbols that are unused by gdb "
 503                    "(at least versions <= 6.7)"),
 504                 NULL, TWO_DASHES, &General_options::set_strip_debug_gdb),
 505   // This must come after -Sdebug since it's a prefix of it.
 506   GENERAL_NOARG('S', "strip-debug", N_("Strip debugging information"), NULL,
 507                 TWO_DASHES, &General_options::set_strip_debug),
 508   GENERAL_NOARG('\0', "shared", N_("Generate shared library"),
 509                 NULL, ONE_DASH, &General_options::set_shared),
 510   GENERAL_NOARG('\0', "static", N_("Do not link against shared libraries"),
 511                 NULL, ONE_DASH, &General_options::set_static),
 512   GENERAL_NOARG('\0', "stats", N_("Print resource usage statistics"),
 513                 NULL, TWO_DASHES, &General_options::set_stats),
 514   GENERAL_ARG('\0', "sysroot", N_("Set target system root directory"),
 515               N_("--sysroot DIR"), TWO_DASHES, &General_options::set_sysroot),
 516   GENERAL_ARG('\0', "Ttext", N_("Set the address of the .text section"),
 517               N_("-Ttext ADDRESS"), ONE_DASH,
 518               &General_options::set_text_segment_address),
 519   // This must come after -Ttext since it's a prefix of it.
 520   SPECIAL('T', "script", N_("Read linker script"),
 521           N_("-T FILE, --script FILE"), TWO_DASHES,
 522           &invoke_script),
 523   SPECIAL('\0', "version-script", N_("Read version script"),
 524           N_("--version-script FILE"), TWO_DASHES,
 525           &invoke_version_script),
 526   GENERAL_NOARG('\0', "threads", N_("Run the linker multi-threaded"),
 527                 NULL, TWO_DASHES, &General_options::set_threads),
 528   GENERAL_NOARG('\0', "no-threads", N_("Do not run the linker multi-threaded"),
 529                 NULL, TWO_DASHES, &General_options::clear_threads),
 530   GENERAL_ARG('\0', "thread-count", N_("Number of threads to use"),
 531               N_("--thread-count COUNT"), TWO_DASHES,
 532               &General_options::set_thread_count),
 533   GENERAL_ARG('\0', "thread-count-initial",
 534               N_("Number of threads to use in initial pass"),
 535               N_("--thread-count-initial COUNT"), TWO_DASHES,
 536               &General_options::set_thread_count_initial),
 537   GENERAL_ARG('\0', "thread-count-middle",
 538               N_("Number of threads to use in middle pass"),
 539               N_("--thread-count-middle COUNT"), TWO_DASHES,
 540               &General_options::set_thread_count_middle),
 541   GENERAL_ARG('\0', "thread-count-final",
 542               N_("Number of threads to use in final pass"),
 543               N_("--thread-count-final COUNT"), TWO_DASHES,
 544               &General_options::set_thread_count_final),
 545   POSDEP_NOARG('\0', "whole-archive",
 546                N_("Include all archive contents"),
 547                NULL, TWO_DASHES,
 548                &Position_dependent_options::set_whole_archive),
 549   POSDEP_NOARG('\0', "no-whole-archive",
 550                N_("Include only needed archive contents"),
 551                NULL, TWO_DASHES,
 552                &Position_dependent_options::clear_whole_archive),
 553
 554   GENERAL_ARG('z', NULL,
 555               N_("Subcommands as follows:\n\
 556     -z execstack              Mark output as requiring executable stack\n\
 557     -z noexecstack            Mark output as not requiring executable stack"),
 558               N_("-z SUBCOMMAND"), ONE_DASH,
 559               &General_options::handle_z_option),
 560
 561   SPECIAL('(', "start-group", N_("Start a library search group"), NULL,
 562           TWO_DASHES, &start_group),
 563   SPECIAL(')', "end-group", N_("End a library search group"), NULL,
 564           TWO_DASHES, &end_group),
 565   SPECIAL('\0', "help", N_("Report usage information"), NULL,
 566           TWO_DASHES, &help),
 567   SPECIAL('v', "version", N_("Report version information"), NULL,
 568           TWO_DASHES, &version),
 569   GENERAL_ARG('\0', "debug", N_("Turn on debugging (all,task,script)"),
 570               N_("--debug=TYPE"), TWO_DASHES,
 571               &General_options::handle_debug_option)
 572 };
 573
 574 const int options::Command_line_options::options_size =
 575   sizeof (options) / sizeof (options[0]);
 576
 577 // The -z options.
 578
 579 const options::One_z_option
 580 options::Command_line_options::z_options[] =
 581 {
 582   { "execstack", &General_options::set_execstack },
 583   { "noexecstack", &General_options::set_noexecstack },
 584 };
 585
 586 const int options::Command_line_options::z_options_size =
 587   sizeof(z_options) / sizeof(z_options[0]);
 588
 589 // The --debug options.
 590
 591 const options::One_debug_option
 592 options::Command_line_options::debug_options[] =
 593 {
 594   { "all", DEBUG_ALL },
 595   { "task", DEBUG_TASK },
 596   { "script", DEBUG_SCRIPT }
 597 };
 598
 599 const int options::Command_line_options::debug_options_size =
 600   sizeof(debug_options) / sizeof(debug_options[0]);
 601
 602 // The default values for the general options.
 603
 604 General_options::General_options(Script_options* script_options)
 605   : export_dynamic_(false),
 606     soname_(NULL),
 607     dynamic_linker_(NULL),
 608     search_path_(),
 609     optimization_level_(0),
 610     output_file_name_("a.out"),
 611     output_format_(OUTPUT_FORMAT_ELF),
 612     is_relocatable_(false),
 613     strip_(STRIP_NONE),
 614     allow_shlib_undefined_(false),
 615     symbolic_(false),
 616     compress_debug_sections_(NO_COMPRESSION),
 617     detect_odr_violations_(false),
 618     create_eh_frame_hdr_(false),
 619     rpath_(),
 620     rpath_link_(),
 621     is_shared_(false),
 622     is_static_(false),
 623     print_stats_(false),
 624     sysroot_(),
 625     text_segment_address_(-1U),   // -1 indicates value not set by user
 626     threads_(false),
 627     thread_count_initial_(0),
 628     thread_count_middle_(0),
 629     thread_count_final_(0),
 630     execstack_(EXECSTACK_FROM_INPUT),
 631     debug_(0),
 632     script_options_(script_options)
 633 {
 634   // We initialize demangle_ based on the environment variable
 635   // COLLECT_NO_DEMANGLE.  The gcc collect2 program will demangle the
 636   // output of the linker, unless COLLECT_NO_DEMANGLE is set in the
 637   // environment.  Acting the same way here lets us provide the same
 638   // interface by default.
 639   this->demangle_ = getenv("COLLECT_NO_DEMANGLE") == NULL;
 640 }
 641
 642 // Handle the --defsym option.
 643
 644 void
 645 General_options::define_symbol(const char* arg)
 646 {
 647   this->script_options_->define_symbol(arg);
 648 }
 649
 650 // Handle the --oformat option.  The GNU linker accepts a target name
 651 // with --oformat.  In practice for an ELF target this would be the
 652 // same target as the input files.  That name always start with "elf".
 653 // Non-ELF targets would be "srec", "symbolsrec", "tekhex", "binary",
 654 // "ihex".
 655
 656 void
 657 General_options::set_output_format(const char* arg)
 658 {
 659   if (strncmp(arg, "elf", 3) == 0)
 660     this->output_format_ = OUTPUT_FORMAT_ELF;
 661   else if (strcmp(arg, "binary") == 0)
 662     this->output_format_ = OUTPUT_FORMAT_BINARY;
 663   else
 664     gold_error(_("format '%s' not supported (supported formats: elf, binary)"),
 665                arg);
 666 }
 667
 668 // Handle the -z option.
 669
 670 void
 671 General_options::handle_z_option(const char* arg)
 672 {
 673   const int z_options_size = options::Command_line_options::z_options_size;
 674   const gold::options::One_z_option* z_options =
 675     gold::options::Command_line_options::z_options;
 676   for (int i = 0; i < z_options_size; ++i)
 677     {
 678       if (strcmp(arg, z_options[i].name) == 0)
 679         {
 680           (this->*(z_options[i].set))();
 681           return;
 682         }
 683     }
 684
 685   fprintf(stderr, _("%s: unrecognized -z subcommand: %s\n"),
 686           program_name, arg);
 687   ::exit(EXIT_FAILURE);
 688 }
 689
 690 // Handle the --debug option.
 691
 692 void
 693 General_options::handle_debug_option(const char* arg)
 694 {
 695   const int debug_options_size =
 696     options::Command_line_options::debug_options_size;
 697   const gold::options::One_debug_option* debug_options =
 698     options::Command_line_options::debug_options;
 699   for (int i = 0; i < debug_options_size; ++i)
 700     {
 701       if (strcmp(arg, debug_options[i].name) == 0)
 702         {
 703           this->set_debug(debug_options[i].debug_flags);
 704           return;
 705         }
 706     }
 707
 708   fprintf(stderr, _("%s: unrecognized --debug subcommand: %s\n"),
 709           program_name, arg);
 710   ::exit(EXIT_FAILURE);
 711 }
 712
 713 // Add the sysroot, if any, to the search paths.
 714
 715 void
 716 General_options::add_sysroot()
 717 {
 718   if (this->sysroot_.empty())
 719     {
 720       this->sysroot_ = get_default_sysroot();
 721       if (this->sysroot_.empty())
 722         return;
 723     }
 724
 725   const char* sysroot = this->sysroot_.c_str();
 726   char* canonical_sysroot = lrealpath(sysroot);
 727
 728   for (Dir_list::iterator p = this->search_path_.begin();
 729        p != this->search_path_.end();
 730        ++p)
 731     p->add_sysroot(sysroot, canonical_sysroot);
 732
 733   free(canonical_sysroot);
 734 }
 735
 736 // The default values for the position dependent options.
 737
 738 Position_dependent_options::Position_dependent_options()
 739   : do_static_search_(false),
 740     as_needed_(false),
 741     include_whole_archive_(false)
 742 {
 743 }
 744
 745 // Search_directory methods.
 746
 747 // This is called if we have a sysroot.  Apply the sysroot if
 748 // appropriate.  Record whether the directory is in the sysroot.
 749
 750 void
 751 Search_directory::add_sysroot(const char* sysroot,
 752                               const char* canonical_sysroot)
 753 {
 754   gold_assert(*sysroot != '\0');
 755   if (this->put_in_sysroot_)
 756     {
 757       if (!IS_DIR_SEPARATOR(this->name_[0])
 758           && !IS_DIR_SEPARATOR(sysroot[strlen(sysroot) - 1]))
 759         this->name_ = '/' + this->name_;
 760       this->name_ = sysroot + this->name_;
 761       this->is_in_sysroot_ = true;
 762     }
 763   else
 764     {
 765       // Check whether this entry is in the sysroot.  To do this
 766       // correctly, we need to use canonical names.  Otherwise we will
 767       // get confused by the ../../.. paths that gcc tends to use.
 768       char* canonical_name = lrealpath(this->name_.c_str());
 769       int canonical_name_len = strlen(canonical_name);
 770       int canonical_sysroot_len = strlen(canonical_sysroot);
 771       if (canonical_name_len > canonical_sysroot_len
 772           && IS_DIR_SEPARATOR(canonical_name[canonical_sysroot_len]))
 773         {
 774           canonical_name[canonical_sysroot_len] = '\0';
 775           if (FILENAME_CMP(canonical_name, canonical_sysroot) == 0)
 776             this->is_in_sysroot_ = true;
 777         }
 778       free(canonical_name);
 779     }
 780 }
 781
 782 // Input_arguments methods.
 783
 784 // Add a file to the list.
 785
 786 void
 787 Input_arguments::add_file(const Input_file_argument& file)
 788 {
 789   if (!this->in_group_)
 790     this->input_argument_list_.push_back(Input_argument(file));
 791   else
 792     {
 793       gold_assert(!this->input_argument_list_.empty());
 794       gold_assert(this->input_argument_list_.back().is_group());
 795       this->input_argument_list_.back().group()->add_file(file);
 796     }
 797 }
 798
 799 // Start a group.
 800
 801 void
 802 Input_arguments::start_group()
 803 {
 804   gold_assert(!this->in_group_);
 805   Input_file_group* group = new Input_file_group();
 806   this->input_argument_list_.push_back(Input_argument(group));
 807   this->in_group_ = true;
 808 }
 809
 810 // End a group.
 811
 812 void
 813 Input_arguments::end_group()
 814 {
 815   gold_assert(this->in_group_);
 816   this->in_group_ = false;
 817 }
 818
 819 // Command_line options.
 820
 821 Command_line::Command_line(Script_options* script_options)
 822   : options_(script_options), position_options_(), inputs_()
 823 {
 824 }
 825
 826 // Process the command line options.  For process_one_option,
 827 // i is the index of argv to process next, and the return value
 828 // is the index of the next option to process (i+1 or i+2, or argc
 829 // to indicate processing is done).  no_more_options is set to true
 830 // if (and when) "--" is seen as an option.
 831
 832 int
 833 Command_line::process_one_option(int argc, char** argv, int i,
 834                                  bool* no_more_options)
 835 {
 836   const int options_size = options::Command_line_options::options_size;
 837   const options::One_option* options = options::Command_line_options::options;
 838   gold_assert(i < argc);
 839
 840   if (argv[i][0] != '-' || *no_more_options)
 841     {
 842       this->add_file(argv[i], false);
 843       return i + 1;
 844     }
 845
 846   // Option starting with '-'.
 847   int dashes = 1;
 848   if (argv[i][1] == '-')
 849     {
 850       dashes = 2;
 851       if (argv[i][2] == '\0')
 852         {
 853           *no_more_options = true;
 854           return i + 1;
 855         }
 856     }
 857
 858   // Look for a long option match.
 859   char* opt = argv[i] + dashes;
 860   char first = opt[0];
 861   int skiparg = 0;
 862   char* arg = strchr(opt, '=');
 863   bool argument_with_equals = arg != NULL;
 864   if (arg != NULL)
 865     {
 866       *arg = '\0';
 867       ++arg;
 868     }
 869   else if (i + 1 < argc)
 870     {
 871       arg = argv[i + 1];
 872       skiparg = 1;
 873     }
 874
 875   int j;
 876   for (j = 0; j < options_size; ++j)
 877     {
 878       if (options[j].long_option != NULL
 879           && (dashes == 2
 880               || (options[j].dash
 881                   != options::One_option::EXACTLY_TWO_DASHES))
 882           && first == options[j].long_option[0]
 883           && strcmp(opt, options[j].long_option) == 0)
 884         {
 885           if (options[j].special)
 886             {
 887               // Restore the '=' we clobbered above.
 888               if (arg != NULL && skiparg == 0)
 889                 arg[-1] = '=';
 890               i += options[j].special(argc - i, argv + i, opt, true, this);
 891             }
 892           else
 893             {
 894               if (!options[j].takes_argument())
 895                 {
 896                   if (argument_with_equals)
 897                     this->usage(_("unexpected argument"), argv[i]);
 898                   arg = NULL;
 899                   skiparg = 0;
 900                 }
 901               else
 902                 {
 903                   if (arg == NULL)
 904                     this->usage(_("missing argument"), argv[i]);
 905                 }
 906               this->apply_option(options[j], arg);
 907               i += skiparg + 1;
 908             }
 909           break;
 910         }
 911     }
 912   if (j < options_size)
 913     return i;
 914
 915   // If we saw two dashes, we needed to have seen a long option.
 916   if (dashes == 2)
 917     this->usage(_("unknown option"), argv[i]);
 918
 919   // Look for a short option match.  There may be more than one
 920   // short option in a given argument.
 921   bool done = false;
 922   char* s = argv[i] + 1;
 923   ++i;
 924   while (*s != '\0' && !done)
 925     {
 926       char opt = *s;
 927       int j;
 928       for (j = 0; j < options_size; ++j)
 929         {
 930           if (options[j].short_option == opt)
 931             {
 932               if (options[j].special)
 933                 {
 934                   // Undo the argument skip done above.
 935                   --i;
 936                   i += options[j].special(argc - i, argv + i, s, false,
 937                                           this);
 938                   done = true;
 939                 }
 940               else
 941                 {
 942                   arg = NULL;
 943                   if (options[j].takes_argument())
 944                     {
 945                       if (s[1] != '\0')
 946                         {
 947                           arg = s + 1;
 948                           done = true;
 949                         }
 950                       else if (i < argc)
 951                         {
 952                           arg = argv[i];
 953                           ++i;
 954                         }
 955                       else
 956                         this->usage(_("missing argument"), opt);
 957                     }
 958                   this->apply_option(options[j], arg);
 959                 }
 960               break;
 961             }
 962         }
 963
 964       if (j >= options_size)
 965         this->usage(_("unknown option"), *s);
 966
 967       ++s;
 968     }
 969   return i;
 970 }
 971
 972
 973 void
 974 Command_line::process(int argc, char** argv)
 975 {
 976   bool no_more_options = false;
 977   int i = 0;
 978   while (i < argc)
 979     i = process_one_option(argc, argv, i, &no_more_options);
 980
 981   if (this->inputs_.in_group())
 982     {
 983       fprintf(stderr, _("%s: missing group end\n"), program_name);
 984       this->usage();
 985     }
 986
 987   // FIXME: We should only do this when configured in native mode.
 988   this->options_.add_to_search_path_with_sysroot("/lib");
 989   this->options_.add_to_search_path_with_sysroot("/usr/lib");
 990
 991   this->options_.add_sysroot();
 992
 993   // Ensure options don't contradict each other and are otherwise kosher.
 994   this->normalize_options();
 995 }
 996
 997 // Extract an option argument for a special option.  LONGNAME is the
 998 // long name of the option.  This sets *PRET to the return value for
 999 // the special function handler to skip to the next option.
1000
1001 const char*
1002 Command_line::get_special_argument(const char* longname, int argc, char** argv,
1003                                    const char* arg, bool long_option,
1004                                    int *pret)
1005 {
1006   if (long_option)
1007     {
1008       size_t longlen = strlen(longname);
1009       gold_assert(strncmp(arg, longname, longlen) == 0);
1010       arg += longlen;
1011       if (*arg == '=')
1012         {
1013           *pret = 1;
1014           return arg + 1;
1015         }
1016       else if (argc > 1)
1017         {
1018           gold_assert(*arg == '\0');
1019           *pret = 2;
1020           return argv[1];
1021         }
1022     }
1023   else
1024     {
1025       if (arg[1] != '\0')
1026         {
1027           *pret = 1;
1028           return arg + 1;
1029         }
1030       else if (argc > 1)
1031         {
1032           *pret = 2;
1033           return argv[1];
1034         }
1035     }
1036
1037   this->usage(_("missing argument"), arg);
1038 }
1039
1040 // Ensure options don't contradict each other and are otherwise kosher.
1041
1042 void
1043 Command_line::normalize_options()
1044 {
1045   if (this->options_.is_shared() && this->options_.is_relocatable())
1046     gold_fatal(_("-shared and -r are incompatible"));
1047
1048   if (this->options_.output_format() != General_options::OUTPUT_FORMAT_ELF
1049       && (this->options_.is_shared() || this->options_.is_relocatable()))
1050     gold_fatal(_("binary output format not compatible with -shared or -r"));
1051
1052   // If the user specifies both -s and -r, convert the -s as -S.
1053   // -r requires us to keep externally visible symbols!
1054   if (this->options_.strip_all() && this->options_.is_relocatable())
1055     {
1056       // Clears the strip_all() status, replacing it with strip_debug().
1057       this->options_.set_strip_debug();
1058     }
1059
1060   // FIXME: we can/should be doing a lot more sanity checking here.
1061 }
1062
1063
1064 // Apply a command line option.
1065
1066 void
1067 Command_line::apply_option(const options::One_option& opt,
1068                            const char* arg)
1069 {
1070   if (arg == NULL)
1071     {
1072       if (opt.general_noarg)
1073         (this->options_.*(opt.general_noarg))();
1074       else if (opt.dependent_noarg)
1075         (this->position_options_.*(opt.dependent_noarg))();
1076       else
1077         gold_unreachable();
1078     }
1079   else
1080     {
1081       if (opt.general_arg)
1082         (this->options_.*(opt.general_arg))(arg);
1083       else if (opt.dependent_arg)
1084         (this->position_options_.*(opt.dependent_arg))(arg);
1085       else
1086         gold_unreachable();
1087     }
1088 }
1089
1090 // Add an input file or library.
1091
1092 void
1093 Command_line::add_file(const char* name, bool is_lib)
1094 {
1095   Input_file_argument file(name, is_lib, "", false, this->position_options_);
1096   this->inputs_.add_file(file);
1097 }
1098
1099 // Handle the -l option, which requires special treatment.
1100
1101 int
1102 Command_line::process_l_option(int argc, char** argv, char* arg,
1103                                bool long_option)
1104 {
1105   int ret;
1106   const char* libname = this->get_special_argument("library", argc, argv, arg,
1107                                                    long_option, &ret);
1108   this->add_file(libname, true);
1109   return ret;
1110 }
1111
1112 // Handle the --start-group option.
1113
1114 void
1115 Command_line::start_group(const char* arg)
1116 {
1117   if (this->inputs_.in_group())
1118     this->usage(_("may not nest groups"), arg);
1119   this->inputs_.start_group();
1120 }
1121
1122 // Handle the --end-group option.
1123
1124 void
1125 Command_line::end_group(const char* arg)
1126 {
1127   if (!this->inputs_.in_group())
1128     this->usage(_("group end without group start"), arg);
1129   this->inputs_.end_group();
1130 }
1131
1132 // Report a usage error.  */
1133
1134 void
1135 Command_line::usage()
1136 {
1137   fprintf(stderr,
1138           _("%s: use the --help option for usage information\n"),
1139           program_name);
1140   ::exit(EXIT_FAILURE);
1141 }
1142
1143 void
1144 Command_line::usage(const char* msg, const char *opt)
1145 {
1146   fprintf(stderr,
1147           _("%s: %s: %s\n"),
1148           program_name, opt, msg);
1149   this->usage();
1150 }
1151
1152 void
1153 Command_line::usage(const char* msg, char opt)
1154 {
1155   fprintf(stderr,
1156           _("%s: -%c: %s\n"),
1157           program_name, opt, msg);
1158   this->usage();
1159 }
1160
1161 } // End namespace gold.