ld/lexsup.c

   1 /* Parse options for the GNU linker.
   2    Copyright (C) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GLD, the Gnu Linker.
   5
   6 GLD is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GLD is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GLD; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "bfd.h"
  21 #include "sysdep.h"
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <ctype.h>
  25 #include "getopt.h"
  26 #include "bfdlink.h"
  27 #include "ld.h"
  28 #include "ldmain.h"
  29 #include "ldmisc.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldgram.h"
  33 #include "ldlex.h"
  34 #include "ldfile.h"
  35 #include "ldver.h"
  36 #include "ldemul.h"
  37
  38 /* Somewhere above, sys/stat.h got included . . . . */
  39 #if !defined(S_ISDIR) && defined(S_IFDIR)
  40 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  41 #endif
  42
  43 /* Omit args to avoid the possibility of clashing with a system header
  44    that might disagree about consts.  */
  45 unsigned long strtoul ();
  46
  47 static void set_default_dirlist PARAMS ((char *dirlist_ptr));
  48 static void set_section_start PARAMS ((char *sect, char *valstr));
  49 static void help PARAMS ((void));
  50
  51 /* Non-zero if we are processing a --defsym from the command line.  */
  52 int parsing_defsym = 0;
  53
  54 /* Codes used for the long options with no short synonyms.  150 isn't
  55    special; it's just an arbitrary non-ASCII char value.  */
  56
  57 #define OPTION_ASSERT                   150
  58 #define OPTION_CALL_SHARED              (OPTION_ASSERT + 1)
  59 #define OPTION_DEFSYM                   (OPTION_CALL_SHARED + 1)
  60 #define OPTION_DYNAMIC_LINKER           (OPTION_DEFSYM + 1)
  61 #define OPTION_EB                       (OPTION_DYNAMIC_LINKER + 1)
  62 #define OPTION_EL                       (OPTION_EB + 1)
  63 #define OPTION_EMBEDDED_RELOCS          (OPTION_EL + 1)
  64 #define OPTION_EXPORT_DYNAMIC           (OPTION_EMBEDDED_RELOCS + 1)
  65 #define OPTION_HELP                     (OPTION_EXPORT_DYNAMIC + 1)
  66 #define OPTION_IGNORE                   (OPTION_HELP + 1)
  67 #define OPTION_MAP                      (OPTION_IGNORE + 1)
  68 #define OPTION_NO_KEEP_MEMORY           (OPTION_MAP + 1)
  69 #define OPTION_NOINHIBIT_EXEC           (OPTION_NO_KEEP_MEMORY + 1)
  70 #define OPTION_NON_SHARED               (OPTION_NOINHIBIT_EXEC + 1)
  71 #define OPTION_NO_WHOLE_ARCHIVE         (OPTION_NON_SHARED + 1)
  72 #define OPTION_OFORMAT                  (OPTION_NO_WHOLE_ARCHIVE + 1)
  73 #define OPTION_RELAX                    (OPTION_OFORMAT + 1)
  74 #define OPTION_RETAIN_SYMBOLS_FILE      (OPTION_RELAX + 1)
  75 #define OPTION_RPATH                    (OPTION_RETAIN_SYMBOLS_FILE + 1)
  76 #define OPTION_RPATH_LINK               (OPTION_RPATH + 1)
  77 #define OPTION_SHARED                   (OPTION_RPATH_LINK + 1)
  78 #define OPTION_SONAME                   (OPTION_SHARED + 1)
  79 #define OPTION_SORT_COMMON              (OPTION_SONAME + 1)
  80 #define OPTION_STATS                    (OPTION_SORT_COMMON + 1)
  81 #define OPTION_SYMBOLIC                 (OPTION_STATS + 1)
  82 #define OPTION_TBSS                     (OPTION_SYMBOLIC + 1)
  83 #define OPTION_TDATA                    (OPTION_TBSS + 1)
  84 #define OPTION_TTEXT                    (OPTION_TDATA + 1)
  85 #define OPTION_TRADITIONAL_FORMAT       (OPTION_TTEXT + 1)
  86 #define OPTION_UR                       (OPTION_TRADITIONAL_FORMAT + 1)
  87 #define OPTION_VERBOSE                  (OPTION_UR + 1)
  88 #define OPTION_VERSION                  (OPTION_VERBOSE + 1)
  89 #define OPTION_WARN_COMMON              (OPTION_VERSION + 1)
  90 #define OPTION_WARN_CONSTRUCTORS        (OPTION_WARN_COMMON + 1)
  91 #define OPTION_WARN_MULTIPLE_GP         (OPTION_WARN_CONSTRUCTORS + 1)
  92 #define OPTION_WARN_ONCE                (OPTION_WARN_MULTIPLE_GP + 1)
  93 #define OPTION_SPLIT_BY_RELOC           (OPTION_WARN_ONCE + 1)
  94 #define OPTION_SPLIT_BY_FILE            (OPTION_SPLIT_BY_RELOC + 1)
  95 #define OPTION_WHOLE_ARCHIVE            (OPTION_SPLIT_BY_FILE + 1)
  96 #define OPTION_WRAP                     (OPTION_WHOLE_ARCHIVE + 1)
  97
  98 /* The long options.  This structure is used for both the option
  99    parsing and the help text.  */
 100
 101 struct ld_option
 102 {
 103   /* The long option information.  */
 104   struct option opt;
 105   /* The short option with the same meaning ('\0' if none).  */
 106   char shortopt;
 107   /* The name of the argument (NULL if none).  */
 108   const char *arg;
 109   /* The documentation string.  If this is NULL, this is a synonym for
 110      the previous option.  */
 111   const char *doc;
 112   enum
 113     {
 114       /* Use one dash before long option name.  */
 115       ONE_DASH,
 116       /* Use two dashes before long option name.  */
 117       TWO_DASHES,
 118       /* Don't mention this option in --help output.  */
 119       NO_HELP
 120     } control;
 121 };
 122
 123 static const struct ld_option ld_options[] =
 124 {
 125   { {NULL, required_argument, NULL, '\0'},
 126       'a', "KEYWORD", "Shared library control for HP/UX compatibility",
 127       ONE_DASH },
 128   { {"architecture", required_argument, NULL, 'A'},
 129       'A', "ARCH", "Set architecture" , TWO_DASHES },
 130   { {"format", required_argument, NULL, 'b'},
 131       'b', "TARGET", "Specify target for following input files", TWO_DASHES },
 132   { {"mri-script", required_argument, NULL, 'c'},
 133       'c', "FILE", "Read MRI format linker script", TWO_DASHES },
 134   { {"dc", no_argument, NULL, 'd'},
 135       'd', NULL, "Force common symbols to be defined", ONE_DASH },
 136   { {"dp", no_argument, NULL, 'd'},
 137       '\0', NULL, NULL, ONE_DASH },
 138   { {"entry", required_argument, NULL, 'e'},
 139       'e', "ADDRESS", "Set start address", TWO_DASHES },
 140   { {"export-dynamic", no_argument, NULL, OPTION_EXPORT_DYNAMIC},
 141       'E', NULL, "Export all dynamic symbols", TWO_DASHES },
 142   { {NULL, no_argument, NULL, '\0'},
 143       'F', NULL, "Ignored", ONE_DASH },
 144   { {"gpsize", required_argument, NULL, 'G'},
 145       'G', "SIZE", "Small data size (if no size, same as --shared)",
 146       TWO_DASHES },
 147   { {NULL, no_argument, NULL, '\0'},
 148       'g', NULL, "Ignored", ONE_DASH },
 149   { {"soname", required_argument, NULL, OPTION_SONAME},
 150       'h', "FILENAME", "Set internal name of shared library", ONE_DASH },
 151   { {"library", required_argument, NULL, 'l'},
 152       'l', "LIBNAME", "Search for library LIBNAME", TWO_DASHES },
 153   { {"library-path", required_argument, NULL, 'L'},
 154       'L', "DIRECTORY", "Add DIRECTORY to library search path", TWO_DASHES },
 155   { {NULL, required_argument, NULL, '\0'},
 156       'm', "EMULATION", "Set emulation", ONE_DASH },
 157   { {"print-map", no_argument, NULL, 'M'},
 158       'M', NULL, "Print map file on standard output", TWO_DASHES },
 159   { {"nmagic", no_argument, NULL, 'n'},
 160       'n', NULL, "Do not page align data", TWO_DASHES },
 161   { {"omagic", no_argument, NULL, 'N'},
 162       'N', NULL, "Do not page align data, do not make text readonly",
 163       TWO_DASHES },
 164   { {"output", required_argument, NULL, 'o'},
 165       'o', "FILE", "Set output file name", TWO_DASHES },
 166   { {NULL, required_argument, NULL, '\0'},
 167       'O', NULL, "Ignored", ONE_DASH },
 168   { {"relocateable", no_argument, NULL, 'r'},
 169       'r', NULL, "Generate relocateable output", TWO_DASHES },
 170   { {NULL, no_argument, NULL, '\0'},
 171       'i', NULL, NULL, ONE_DASH },
 172   { {"just-symbols", required_argument, NULL, 'R'},
 173       'R', "FILE", "Just link symbols (if directory, same as --rpath)",
 174       TWO_DASHES },
 175   { {"strip-all", no_argument, NULL, 's'},
 176       's', NULL, "Strip all symbols", TWO_DASHES },
 177   { {"strip-debug", no_argument, NULL, 'S'},
 178       'S', NULL, "Strip debugging symbols", TWO_DASHES },
 179   { {"trace", no_argument, NULL, 't'},
 180       't', NULL, "Trace file opens", TWO_DASHES },
 181   { {"script", required_argument, NULL, 'T'},
 182       'T', "FILE", "Read linker script", TWO_DASHES },
 183   { {"undefined", required_argument, NULL, 'u'},
 184       'u', "SYMBOL", "Start with undefined reference to SYMBOL", TWO_DASHES },
 185   { {"version", no_argument, NULL, OPTION_VERSION},
 186       'v', NULL, "Print version information", TWO_DASHES },
 187   { {NULL, no_argument, NULL, '\0'},
 188       'V', NULL, "Print version and emulation information", ONE_DASH },
 189   { {"discard-all", no_argument, NULL, 'x'},
 190       'x', NULL, "Discard all local symbols", TWO_DASHES },
 191   { {"discard-locals", no_argument, NULL, 'X'},
 192       'X', NULL, "Discard temporary local symbols", TWO_DASHES },
 193   { {"trace-symbol", required_argument, NULL, 'y'},
 194       'y', "SYMBOL", "Trace mentions of SYMBOL", TWO_DASHES },
 195   { {NULL, required_argument, NULL, '\0'},
 196       'Y', "PATH", "Default search path for Solaris compatibility", ONE_DASH },
 197   { {NULL, required_argument, NULL, '\0'},
 198       'z', "KEYWORD", "Ignored for Solaris compatibility", ONE_DASH },
 199   { {"start-group", no_argument, NULL, '('},
 200       '(', NULL, "Start a group", TWO_DASHES },
 201   { {"end-group", no_argument, NULL, ')'},
 202       ')', NULL, "End a group", TWO_DASHES },
 203   { {"assert", required_argument, NULL, OPTION_ASSERT},
 204       '\0', "KEYWORD", "Ignored for SunOS compatibility", ONE_DASH },
 205   { {"Bdynamic", no_argument, NULL, OPTION_CALL_SHARED},
 206       '\0', NULL, "Link against shared libraries", ONE_DASH },
 207   { {"call_shared", no_argument, NULL, OPTION_CALL_SHARED},
 208       '\0', NULL, NULL, ONE_DASH },
 209   { {"dy", no_argument, NULL, OPTION_CALL_SHARED},
 210       '\0', NULL, NULL, ONE_DASH },
 211   { {"Bstatic", no_argument, NULL, OPTION_NON_SHARED},
 212       '\0', NULL, "Do not link against shared libraries", ONE_DASH },
 213   { {"dn", no_argument, NULL, OPTION_NON_SHARED},
 214       '\0', NULL, NULL, ONE_DASH },
 215   { {"non_shared", no_argument, NULL, OPTION_NON_SHARED},
 216       '\0', NULL, NULL, ONE_DASH },
 217   { {"static", no_argument, NULL, OPTION_NON_SHARED},
 218       '\0', NULL, NULL, ONE_DASH },
 219   { {"Bsymbolic", no_argument, NULL, OPTION_SYMBOLIC},
 220       '\0', NULL, "Bind global references locally", ONE_DASH },
 221   { {"defsym", required_argument, NULL, OPTION_DEFSYM},
 222       '\0', "SYMBOL=EXPRESSION", "Define a symbol", TWO_DASHES },
 223   { {"dynamic-linker", required_argument, NULL, OPTION_DYNAMIC_LINKER},
 224       '\0', "PROGRAM", "Set the dynamic linker to use", TWO_DASHES },
 225   { {"EB", no_argument, NULL, OPTION_EB},
 226       '\0', NULL, "Link big-endian objects", ONE_DASH },
 227   { {"EL", no_argument, NULL, OPTION_EL},
 228       '\0', NULL, "Link little-endian objects", ONE_DASH },
 229   { {"embedded-relocs", no_argument, NULL, OPTION_EMBEDDED_RELOCS},
 230       '\0', NULL, "Generate embedded relocs", TWO_DASHES},
 231   { {"help", no_argument, NULL, OPTION_HELP},
 232       '\0', NULL, "Print option help", TWO_DASHES },
 233   { {"Map", required_argument, NULL, OPTION_MAP},
 234       '\0', "FILE", "Write a map file", ONE_DASH },
 235   { {"no-keep-memory", no_argument, NULL, OPTION_NO_KEEP_MEMORY},
 236       '\0', NULL, "Use less memory and more disk I/O", TWO_DASHES },
 237   { {"no-whole-archive", no_argument, NULL, OPTION_NO_WHOLE_ARCHIVE},
 238       '\0', NULL, "Turn off --whole-archive", TWO_DASHES },
 239   { {"noinhibit-exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
 240       '\0', NULL, "Create an output file even if errors occur", TWO_DASHES },
 241   { {"noinhibit_exec", no_argument, NULL, OPTION_NOINHIBIT_EXEC},
 242       '\0', NULL, NULL, NO_HELP },
 243   { {"oformat", required_argument, NULL, OPTION_OFORMAT},
 244       '\0', "TARGET", "Specify target of output file", TWO_DASHES },
 245   { {"qmagic", no_argument, NULL, OPTION_IGNORE},
 246       '\0', NULL, "Ignored for Linux compatibility", ONE_DASH },
 247   { {"Qy", no_argument, NULL, OPTION_IGNORE},
 248       '\0', NULL, "Ignored for SVR4 compatibility", ONE_DASH },
 249   { {"relax", no_argument, NULL, OPTION_RELAX},
 250       '\0', NULL, "Relax branches on certain targets", TWO_DASHES },
 251   { {"retain-symbols-file", required_argument, NULL,
 252        OPTION_RETAIN_SYMBOLS_FILE},
 253       '\0', "FILE", "Keep only symbols listed in FILE", TWO_DASHES },
 254   { {"rpath", required_argument, NULL, OPTION_RPATH},
 255       '\0', "PATH", "Set runtime shared library search path", ONE_DASH },
 256   { {"rpath-link", required_argument, NULL, OPTION_RPATH_LINK},
 257       '\0', "PATH", "Set line time shared library search path", ONE_DASH },
 258   { {"shared", no_argument, NULL, OPTION_SHARED},
 259       '\0', NULL, "Create a shared library", ONE_DASH },
 260   { {"Bshareable", no_argument, NULL, OPTION_SHARED }, /* FreeBSD.  */
 261       '\0', NULL, NULL, ONE_DASH },
 262   { {"sort-common", no_argument, NULL, OPTION_SORT_COMMON},
 263       '\0', NULL, "Sort common symbols by size", TWO_DASHES },
 264   { {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
 265       '\0', NULL, NULL, NO_HELP },
 266   { {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
 267       '\0', NULL, "Split output sections for each file", TWO_DASHES },
 268   { {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
 269       '\0', "COUNT", "Split output sections every COUNT relocs", TWO_DASHES },
 270   { {"stats", no_argument, NULL, OPTION_STATS},
 271       '\0', NULL, "Print memory usage statistics", TWO_DASHES },
 272   { {"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT},
 273       '\0', NULL, "Use same format as native linker", TWO_DASHES },
 274   { {"Tbss", required_argument, NULL, OPTION_TBSS},
 275       '\0', "ADDRESS", "Set address of .bss section", ONE_DASH },
 276   { {"Tdata", required_argument, NULL, OPTION_TDATA},
 277       '\0', "ADDRESS", "Set address of .data section", ONE_DASH },
 278   { {"Ttext", required_argument, NULL, OPTION_TTEXT},
 279       '\0', "ADDRESS", "Set address of .text section", ONE_DASH },
 280   { {"Ur", no_argument, NULL, OPTION_UR},
 281       '\0', NULL, "Build global constructor/destructor tables", ONE_DASH },
 282   { {"verbose", no_argument, NULL, OPTION_VERBOSE},
 283       '\0', NULL, "Output lots of information during link", TWO_DASHES },
 284   { {"dll-verbose", no_argument, NULL, OPTION_VERSION}, /* Linux.  */
 285       '\0', NULL, NULL, NO_HELP },
 286   { {"warn-common", no_argument, NULL, OPTION_WARN_COMMON},
 287       '\0', NULL, "Warn about duplicate common symbols", TWO_DASHES },
 288   { {"warn-constructors", no_argument, NULL, OPTION_WARN_CONSTRUCTORS},
 289       '\0', NULL, "Warn if global constructors/destructors are seen",
 290       TWO_DASHES },
 291   { {"warn-multiple-gp", no_argument, NULL, OPTION_WARN_MULTIPLE_GP},
 292       '\0', NULL, "Warn if the multiple GP values are used", TWO_DASHES },
 293   { {"warn-once", no_argument, NULL, OPTION_WARN_ONCE},
 294       '\0', NULL, "Warn only once per undefined symbol", TWO_DASHES },
 295   { {"whole-archive", no_argument, NULL, OPTION_WHOLE_ARCHIVE},
 296       '\0', NULL, "Include all objects from following archives", TWO_DASHES },
 297   { {"wrap", required_argument, NULL, OPTION_WRAP},
 298       '\0', "SYMBOL", "Use wrapper functions for SYMBOL", TWO_DASHES }
 299 };
 300
 301 #define OPTION_COUNT (sizeof ld_options / sizeof ld_options[0])
 302
 303 void
 304 parse_args (argc, argv)
 305      int argc;
 306      char **argv;
 307 {
 308   int i, is, il;
 309   int ingroup = 0;
 310   char *default_dirlist = NULL;
 311   char shortopts[OPTION_COUNT * 2 + 2];
 312   struct option longopts[OPTION_COUNT + 1];
 313
 314   /* Starting the short option string with '-' is for programs that
 315      expect options and other ARGV-elements in any order and that care about
 316      the ordering of the two.  We describe each non-option ARGV-element
 317      as if it were the argument of an option with character code 1.  */
 318   shortopts[0] = '-';
 319   is = 1;
 320   il = 0;
 321   for (i = 0; i < OPTION_COUNT; i++)
 322     {
 323       if (ld_options[i].shortopt != '\0')
 324         {
 325           shortopts[is] = ld_options[i].shortopt;
 326           ++is;
 327           if (ld_options[i].opt.has_arg == required_argument)
 328             {
 329               shortopts[is] = ':';
 330               ++is;
 331             }
 332         }
 333       if (ld_options[i].opt.name != NULL)
 334         {
 335           longopts[il] = ld_options[i].opt;
 336           ++il;
 337         }
 338     }
 339   shortopts[is] = '\0';
 340   longopts[il].name = NULL;
 341
 342   /* The -G option is ambiguous on different platforms.  Sometimes it
 343      specifies the largest data size to put into the small data
 344      section.  Sometimes it is equivalent to --shared.  Unfortunately,
 345      the first form takes an argument, while the second does not.
 346
 347      We need to permit the --shared form because on some platforms,
 348      such as Solaris, gcc -shared will pass -G to the linker.
 349
 350      To permit either usage, we look through the argument list.  If we
 351      find -G not followed by a number, we change it into --shared.
 352      This will work for most normal cases.  */
 353   for (i = 1; i < argc; i++)
 354     if (strcmp (argv[i], "-G") == 0
 355         && (i + 1 >= argc
 356             || ! isdigit (argv[i + 1][0])))
 357       argv[i] = (char *) "--shared";
 358
 359   while (1)
 360     {
 361       /* getopt_long_only is like getopt_long, but '-' as well as '--' can
 362          indicate a long option.  */
 363       int longind;
 364       int optc;
 365
 366       if (ldemul_parse_args (argc, argv))
 367         continue;
 368
 369       optc = getopt_long_only (argc, argv, shortopts, longopts, &longind);
 370
 371       if (optc == -1)
 372         break;
 373       switch (optc)
 374         {
 375         default:
 376           xexit (1);
 377         case 1:                 /* File name.  */
 378           lang_add_input_file (optarg, lang_input_file_is_file_enum,
 379                                (char *) NULL);
 380           break;
 381
 382         case OPTION_IGNORE:
 383           break;
 384         case 'a':
 385           /* For HP/UX compatibility.  Actually -a shared should mean
 386              ``use only shared libraries'' but, then, we don't
 387              currently support shared libraries on HP/UX anyhow.  */
 388           if (strcmp (optarg, "archive") == 0)
 389             config.dynamic_link = false;
 390           else if (strcmp (optarg, "shared") == 0
 391                    || strcmp (optarg, "default") == 0)
 392             config.dynamic_link = true;
 393           else
 394             einfo ("%P%F: unrecognized -a option `%s'\n", optarg);
 395           break;
 396         case OPTION_ASSERT:
 397           /* FIXME: We just ignore these, but we should handle them.  */
 398           if (strcmp (optarg, "definitions") == 0)
 399             ;
 400           else if (strcmp (optarg, "nodefinitions") == 0)
 401             ;
 402           else if (strcmp (optarg, "nosymbolic") == 0)
 403             ;
 404           else if (strcmp (optarg, "pure-text") == 0)
 405             ;
 406           else
 407             einfo ("%P%F: unrecognized -assert option `%s'\n", optarg);
 408           break;
 409         case 'A':
 410           ldfile_add_arch (optarg);
 411           break;
 412         case 'b':
 413           lang_add_target (optarg);
 414           break;
 415         case 'c':
 416           ldfile_open_command_file (optarg);
 417           parser_input = input_mri_script;
 418           yyparse ();
 419           break;
 420         case OPTION_CALL_SHARED:
 421           config.dynamic_link = true;
 422           break;
 423         case OPTION_NON_SHARED:
 424           config.dynamic_link = false;
 425           break;
 426         case 'd':
 427           command_line.force_common_definition = true;
 428           break;
 429         case OPTION_DEFSYM:
 430           lex_string = optarg;
 431           lex_redirect (optarg);
 432           parser_input = input_defsym;
 433           parsing_defsym = 1;
 434           yyparse ();
 435           parsing_defsym = 0;
 436           lex_string = NULL;
 437           break;
 438         case OPTION_DYNAMIC_LINKER:
 439           command_line.interpreter = optarg;
 440           break;
 441         case OPTION_EB:
 442           command_line.endian = ENDIAN_BIG;
 443           break;
 444         case OPTION_EL:
 445           command_line.endian = ENDIAN_LITTLE;
 446           break;
 447         case OPTION_EMBEDDED_RELOCS:
 448           command_line.embedded_relocs = true;
 449           break;
 450         case OPTION_EXPORT_DYNAMIC:
 451         case 'E': /* HP/UX compatibility.  */
 452           command_line.export_dynamic = true;
 453           break;
 454         case 'e':
 455           lang_add_entry (optarg, true);
 456           break;
 457         case 'F':
 458           /* Ignore.  */
 459           break;
 460         case 'G':
 461           {
 462             char *end;
 463             g_switch_value = strtoul (optarg, &end, 0);
 464             if (*end)
 465               einfo ("%P%F: invalid number `%s'\n", optarg);
 466           }
 467           break;
 468         case 'g':
 469           /* Ignore.  */
 470           break;
 471         case OPTION_HELP:
 472           help ();
 473           xexit (0);
 474           break;
 475         case 'L':
 476           ldfile_add_library_path (optarg, true);
 477           break;
 478         case 'l':
 479           lang_add_input_file (optarg, lang_input_file_is_l_enum,
 480                                (char *) NULL);
 481           break;
 482         case 'M':
 483           config.map_filename = "-";
 484           break;
 485         case 'm':
 486           /* Ignore.  Was handled in a pre-parse.   */
 487           break;
 488         case OPTION_MAP:
 489           config.map_filename = optarg;
 490           break;
 491         case 'N':
 492           config.text_read_only = false;
 493           config.magic_demand_paged = false;
 494           config.dynamic_link = false;
 495           break;
 496         case 'n':
 497           config.magic_demand_paged = false;
 498           config.dynamic_link = false;
 499           break;
 500         case OPTION_NO_KEEP_MEMORY:
 501           link_info.keep_memory = false;
 502           break;
 503         case OPTION_NOINHIBIT_EXEC:
 504           force_make_executable = true;
 505           break;
 506         case OPTION_NO_WHOLE_ARCHIVE:
 507           whole_archive = false;
 508           break;
 509         case 'O':
 510           /* FIXME "-O<non-digits> <value>" used to set the address of
 511              section <non-digits>.  Was this for compatibility with
 512              something, or can we create a new option to do that
 513              (with a syntax similar to -defsym)?
 514              getopt can't handle two args to an option without kludges.  */
 515           break;
 516         case 'o':
 517           lang_add_output (optarg, 0);
 518           break;
 519         case OPTION_OFORMAT:
 520           lang_add_output_format (optarg, (char *) NULL, (char *) NULL, 0);
 521           break;
 522         case 'i':
 523         case 'r':
 524           link_info.relocateable = true;
 525           config.build_constructors = false;
 526           config.magic_demand_paged = false;
 527           config.text_read_only = false;
 528           config.dynamic_link = false;
 529           break;
 530         case 'R':
 531           /* The GNU linker traditionally uses -R to mean to include
 532              only the symbols from a file.  The Solaris linker uses -R
 533              to set the path used by the runtime linker to find
 534              libraries.  This is the GNU linker -rpath argument.  We
 535              try to support both simultaneously by checking the file
 536              named.  If it is a directory, rather than a regular file,
 537              we assume -rpath was meant.  */
 538           {
 539             struct stat s;
 540
 541             if (stat (optarg, &s) >= 0
 542                 && ! S_ISDIR (s.st_mode))
 543               {
 544                 lang_add_input_file (optarg,
 545                                      lang_input_file_is_symbols_only_enum,
 546                                      (char *) NULL);
 547                 break;
 548               }
 549           }
 550           /* Fall through.  */
 551         case OPTION_RPATH:
 552           if (command_line.rpath == NULL)
 553             command_line.rpath = buystring (optarg);
 554           else
 555             {
 556               char *buf;
 557
 558               buf = xmalloc (strlen (command_line.rpath)
 559                              + strlen (optarg)
 560                              + 2);
 561               sprintf (buf, "%s:%s", command_line.rpath, optarg);
 562               free (command_line.rpath);
 563               command_line.rpath = buf;
 564             }
 565           break;
 566         case OPTION_RPATH_LINK:
 567           if (command_line.rpath_link == NULL)
 568             command_line.rpath_link = buystring (optarg);
 569           else
 570             {
 571               char *buf;
 572
 573               buf = xmalloc (strlen (command_line.rpath_link)
 574                              + strlen (optarg)
 575                              + 2);
 576               sprintf (buf, "%s:%s", command_line.rpath_link, optarg);
 577               free (command_line.rpath_link);
 578               command_line.rpath_link = buf;
 579             }
 580           break;
 581         case OPTION_RELAX:
 582           command_line.relax = true;
 583           break;
 584         case OPTION_RETAIN_SYMBOLS_FILE:
 585           add_keepsyms_file (optarg);
 586           break;
 587         case 'S':
 588           link_info.strip = strip_debugger;
 589           break;
 590         case 's':
 591           link_info.strip = strip_all;
 592           break;
 593         case OPTION_SHARED:
 594           link_info.shared = true;
 595           break;
 596         case 'h':               /* Used on Solaris.  */
 597         case OPTION_SONAME:
 598           command_line.soname = optarg;
 599           break;
 600         case OPTION_SORT_COMMON:
 601           config.sort_common = true;
 602           break;
 603         case OPTION_STATS:
 604           config.stats = true;
 605           break;
 606         case OPTION_SYMBOLIC:
 607           link_info.symbolic = true;
 608           break;
 609         case 't':
 610           trace_files = true;
 611           break;
 612         case 'T':
 613           ldfile_open_command_file (optarg);
 614           parser_input = input_script;
 615           yyparse ();
 616           break;
 617         case OPTION_TBSS:
 618           set_section_start (".bss", optarg);
 619           break;
 620         case OPTION_TDATA:
 621           set_section_start (".data", optarg);
 622           break;
 623         case OPTION_TTEXT:
 624           set_section_start (".text", optarg);
 625           break;
 626         case OPTION_TRADITIONAL_FORMAT:
 627           config.traditional_format = true;
 628           break;
 629         case OPTION_UR:
 630           link_info.relocateable = true;
 631           config.build_constructors = true;
 632           config.magic_demand_paged = false;
 633           config.text_read_only = false;
 634           config.dynamic_link = false;
 635           break;
 636         case 'u':
 637           ldlang_add_undef (optarg);
 638           break;
 639         case OPTION_VERBOSE:
 640           ldversion (1);
 641           version_printed = true;
 642           trace_file_tries = true;
 643           break;
 644         case 'v':
 645           ldversion (0);
 646           version_printed = true;
 647           break;
 648         case 'V':
 649           ldversion (1);
 650           version_printed = true;
 651           break;
 652         case OPTION_VERSION:
 653           ldversion (0);
 654           version_printed = true;
 655           break;
 656         case OPTION_WARN_COMMON:
 657           config.warn_common = true;
 658           break;
 659         case OPTION_WARN_CONSTRUCTORS:
 660           config.warn_constructors = true;
 661           break;
 662         case OPTION_WARN_MULTIPLE_GP:
 663           config.warn_multiple_gp = true;
 664           break;
 665         case OPTION_WARN_ONCE:
 666           config.warn_once = true;
 667           break;
 668         case OPTION_WHOLE_ARCHIVE:
 669           whole_archive = true;
 670           break;
 671         case OPTION_WRAP:
 672           add_wrap (optarg);
 673           break;
 674         case 'X':
 675           link_info.discard = discard_l;
 676           break;
 677         case 'x':
 678           link_info.discard = discard_all;
 679           break;
 680         case 'Y':
 681           if (strncmp (optarg, "P,", 2) == 0)
 682             optarg += 2;
 683           default_dirlist = optarg;
 684           break;
 685         case 'y':
 686           add_ysym (optarg);
 687           break;
 688         case 'z':
 689           /* We accept and ignore this option for Solaris
 690              compatibility.  Actually, on Solaris, optarg is not
 691              ignored.  Someday we should handle it correctly.  FIXME.  */
 692           break;
 693         case OPTION_SPLIT_BY_RELOC:
 694           config.split_by_reloc = atoi (optarg);
 695           break;
 696         case OPTION_SPLIT_BY_FILE:
 697           config.split_by_file = true;
 698           break;
 699         case '(':
 700           if (ingroup)
 701             {
 702               fprintf (stderr,
 703                        "%s: may not nest groups (--help for usage)\n",
 704                        program_name);
 705               xexit (1);
 706             }
 707           lang_enter_group ();
 708           ingroup = 1;
 709           break;
 710         case ')':
 711           if (! ingroup)
 712             {
 713               fprintf (stderr,
 714                        "%s: group ended before it began (--help for usage)\n",
 715                        program_name);
 716               xexit (1);
 717             }
 718           lang_leave_group ();
 719           ingroup = 0;
 720           break;
 721
 722         }
 723     }
 724
 725   if (ingroup)
 726     lang_leave_group ();
 727
 728   if (default_dirlist != NULL)
 729     set_default_dirlist (default_dirlist);
 730
 731 }
 732
 733 /* Add the (colon-separated) elements of DIRLIST_PTR to the
 734    library search path.  */
 735
 736 static void
 737 set_default_dirlist (dirlist_ptr)
 738      char *dirlist_ptr;
 739 {
 740   char *p;
 741
 742   while (1)
 743     {
 744       p = strchr (dirlist_ptr, ':');
 745       if (p != NULL)
 746         *p = 0;
 747       if (*dirlist_ptr)
 748         ldfile_add_library_path (dirlist_ptr, true);
 749       if (p == NULL)
 750         break;
 751       *p = ':';
 752       dirlist_ptr = p + 1;
 753     }
 754 }
 755
 756 static void
 757 set_section_start (sect, valstr)
 758      char *sect, *valstr;
 759 {
 760   char *end;
 761   unsigned long val = strtoul (valstr, &end, 16);
 762   if (*end)
 763     einfo ("%P%F: invalid hex number `%s'\n", valstr);
 764   lang_section_start (sect, exp_intop (val));
 765 }
 766 \f
 767 /* Print help messages for the options.  */
 768
 769 static void
 770 help ()
 771 {
 772   int i;
 773   const char **targets, **pp;
 774
 775   printf ("Usage: %s [options] file...\n", program_name);
 776
 777   printf ("Options:\n");
 778   for (i = 0; i < OPTION_COUNT; i++)
 779     {
 780       if (ld_options[i].doc != NULL)
 781         {
 782           boolean comma;
 783           int len;
 784           int j;
 785
 786           printf ("  ");
 787
 788           comma = false;
 789           len = 2;
 790
 791           j = i;
 792           do
 793             {
 794               if (ld_options[j].shortopt != '\0'
 795                   && ld_options[j].control != NO_HELP)
 796                 {
 797                   printf ("%s-%c", comma ? ", " : "", ld_options[j].shortopt);
 798                   len += (comma ? 2 : 0) + 2;
 799                   if (ld_options[j].arg != NULL)
 800                     {
 801                       printf (" %s", ld_options[j].arg);
 802                       len += 1 + strlen (ld_options[j].arg);
 803                     }
 804                   comma = true;
 805                 }
 806               ++j;
 807             }
 808           while (j < OPTION_COUNT && ld_options[j].doc == NULL);
 809
 810           j = i;
 811           do
 812             {
 813               if (ld_options[j].opt.name != NULL
 814                   && ld_options[j].control != NO_HELP)
 815                 {
 816                   printf ("%s-%s%s",
 817                           comma ? ", " : "",
 818                           ld_options[j].control == TWO_DASHES ? "-" : "",
 819                           ld_options[j].opt.name);
 820                   len += ((comma ? 2 : 0)
 821                           + 1
 822                           + (ld_options[j].control == TWO_DASHES ? 1 : 0)
 823                           + strlen (ld_options[j].opt.name));
 824                   if (ld_options[j].arg != NULL)
 825                     {
 826                       printf (" %s", ld_options[j].arg);
 827                       len += 1 + strlen (ld_options[j].arg);
 828                     }
 829                   comma = true;
 830                 }
 831               ++j;
 832             }
 833           while (j < OPTION_COUNT && ld_options[j].doc == NULL);
 834
 835           if (len >= 30)
 836             {
 837               printf ("\n");
 838               len = 0;
 839             }
 840
 841           for (; len < 30; len++)
 842             putchar (' ');
 843
 844           printf ("%s\n", ld_options[i].doc);
 845         }
 846     }
 847
 848   printf ("%s: supported targets:", program_name);
 849   targets = bfd_target_list ();
 850   for (pp = targets; *pp != NULL; pp++)
 851     printf (" %s", *pp);
 852   free (targets);
 853   printf ("\n");
 854
 855   printf ("%s: supported emulations: ", program_name);
 856   ldemul_list_emulations (stdout);
 857   printf ("\n");
 858 }