ld/ldmain.c

   1 /* Main program of GNU linker.
   2    Copyright (C) 1991, 92, 93, 94 Free Software Foundation, Inc.
   3    Written by Steve Chamberlain steve@cygnus.com
   4
   5 This file is part of GLD, the Gnu Linker.
   6
   7 GLD is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GLD is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GLD; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include <stdio.h>
  25 #include "libiberty.h"
  26 #include "bfdlink.h"
  27
  28 #include "config.h"
  29 #include "ld.h"
  30 #include "ldmain.h"
  31 #include "ldmisc.h"
  32 #include "ldwrite.h"
  33 #include "ldgram.h"
  34 #include "ldexp.h"
  35 #include "ldlang.h"
  36 #include "ldemul.h"
  37 #include "ldlex.h"
  38 #include "ldfile.h"
  39 #include "ldctor.h"
  40
  41 /* Somewhere above, sys/stat.h got included . . . . */
  42 #if !defined(S_ISDIR) && defined(S_IFDIR)
  43 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  44 #endif
  45
  46 #include <string.h>
  47
  48 static char *get_emulation PARAMS ((int, char **));
  49 static void set_scripts_dir PARAMS ((void));
  50
  51 /* EXPORTS */
  52
  53 char *default_target;
  54 const char *output_filename = "a.out";
  55
  56 /* Name this program was invoked by.  */
  57 char *program_name;
  58
  59 /* The file that we're creating */
  60 bfd *output_bfd = 0;
  61
  62 /* Set by -G argument, for MIPS ECOFF target.  */
  63 int g_switch_value = 8;
  64
  65 /* Nonzero means print names of input files as processed.  */
  66 boolean trace_files;
  67
  68 /* Nonzero means same, but note open failures, too.  */
  69 boolean trace_file_tries;
  70
  71 /* Nonzero means version number was printed, so exit successfully
  72    instead of complaining if no input files are given.  */
  73 boolean version_printed;
  74
  75 /* 1 => write load map.  */
  76 boolean write_map;
  77
  78 args_type command_line;
  79
  80 ld_config_type config;
  81
  82 static boolean check_for_scripts_dir PARAMS ((char *dir));
  83 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
  84                                             const char *));
  85 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
  86                                             const char *,
  87                                             bfd *, asection *, bfd_vma,
  88                                             bfd *, asection *, bfd_vma));
  89 static boolean multiple_common PARAMS ((struct bfd_link_info *,
  90                                         const char *, bfd *,
  91                                         enum bfd_link_hash_type, bfd_vma,
  92                                         bfd *, enum bfd_link_hash_type,
  93                                         bfd_vma));
  94 static boolean add_to_set PARAMS ((struct bfd_link_info *,
  95                                    struct bfd_link_hash_entry *,
  96                                    unsigned int bitsize,
  97                                    bfd *, asection *, bfd_vma));
  98 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
  99                                              boolean constructor,
 100                                              unsigned int bitsize,
 101                                              const char *name,
 102                                              bfd *, asection *, bfd_vma));
 103 static boolean warning_callback PARAMS ((struct bfd_link_info *,
 104                                          const char *));
 105 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
 106                                          const char *, bfd *,
 107                                          asection *, bfd_vma));
 108 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
 109                                        const char *, bfd_vma,
 110                                        bfd *, asection *, bfd_vma));
 111 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
 112                                         bfd *, asection *, bfd_vma));
 113 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
 114                                          const char *, bfd *, asection *,
 115                                          bfd_vma));
 116 static boolean notice_ysym PARAMS ((struct bfd_link_info *, const char *,
 117                                     bfd *, asection *, bfd_vma));
 118
 119 static struct bfd_link_callbacks link_callbacks =
 120 {
 121   add_archive_element,
 122   multiple_definition,
 123   multiple_common,
 124   add_to_set,
 125   constructor_callback,
 126   warning_callback,
 127   undefined_symbol,
 128   reloc_overflow,
 129   reloc_dangerous,
 130   unattached_reloc,
 131   notice_ysym
 132 };
 133
 134 struct bfd_link_info link_info;
 135 \f
 136 static void
 137 remove_output ()
 138 {
 139   if (output_filename)
 140     {
 141       if (output_bfd && output_bfd->iostream)
 142         fclose((FILE *)(output_bfd->iostream));
 143       if (delete_output_file_on_failure)
 144         unlink (output_filename);
 145     }
 146 }
 147
 148 int
 149 main (argc, argv)
 150      int argc;
 151      char **argv;
 152 {
 153   char *emulation;
 154   long start_time = get_run_time ();
 155
 156   program_name = argv[0];
 157   xmalloc_set_program_name (program_name);
 158
 159   bfd_init ();
 160
 161   xatexit (remove_output);
 162
 163   /* Initialize the data about options.  */
 164   trace_files = trace_file_tries = version_printed = false;
 165   write_map = false;
 166   config.build_constructors = true;
 167   command_line.force_common_definition = false;
 168
 169   link_info.callbacks = &link_callbacks;
 170   link_info.relocateable = false;
 171   link_info.strip = strip_none;
 172   link_info.discard = discard_none;
 173   link_info.lprefix_len = 1;
 174   link_info.lprefix = "L";
 175   link_info.keep_memory = true;
 176   link_info.input_bfds = NULL;
 177   link_info.create_object_symbols_section = NULL;
 178   link_info.hash = NULL;
 179   link_info.keep_hash = NULL;
 180   link_info.notice_hash = NULL;
 181
 182   ldfile_add_arch ("");
 183
 184   config.make_executable = true;
 185   force_make_executable = false;
 186   config.magic_demand_paged = true;
 187   config.text_read_only = true;
 188   config.make_executable = true;
 189
 190   emulation = get_emulation (argc, argv);
 191   ldemul_choose_mode (emulation);
 192   default_target = ldemul_choose_target ();
 193   lang_init ();
 194   ldemul_before_parse ();
 195   lang_has_input_file = false;
 196   parse_args (argc, argv);
 197
 198   /* This essentially adds another -L directory so this must be done after
 199      the -L's in argv have been processed.  */
 200   set_scripts_dir ();
 201
 202   if (had_script == false)
 203     {
 204       /* Read the emulation's appropriate default script.  */
 205       int isfile;
 206       char *s = ldemul_get_script (&isfile);
 207
 208       if (isfile)
 209         ldfile_open_command_file (s);
 210       else
 211         lex_redirect (s);
 212       parser_input = input_script;
 213       yyparse ();
 214     }
 215
 216   if (link_info.relocateable && command_line.relax)
 217     {
 218       einfo ("%P%F: -relax and -r may not be used together\n");
 219     }
 220   lang_final ();
 221
 222   if (lang_has_input_file == false)
 223     {
 224       if (version_printed)
 225         xexit (0);
 226       einfo ("%P%F: no input files\n");
 227     }
 228
 229   if (trace_files)
 230     {
 231       info_msg ("%P: mode %s\n", emulation);
 232     }
 233
 234   ldemul_after_parse ();
 235
 236
 237   if (config.map_filename)
 238     {
 239       if (strcmp (config.map_filename, "-") == 0)
 240         {
 241           config.map_file = stdout;
 242         }
 243       else
 244         {
 245           config.map_file = fopen (config.map_filename, FOPEN_WT);
 246           if (config.map_file == (FILE *) NULL)
 247             {
 248               einfo ("%P%F: cannot open map file %s: %E\n",
 249                      config.map_filename);
 250             }
 251         }
 252     }
 253
 254
 255   lang_process ();
 256
 257   /* Print error messages for any missing symbols, for any warning
 258      symbols, and possibly multiple definitions */
 259
 260
 261   if (config.text_read_only)
 262     {
 263       /* Look for a text section and mark the readonly attribute in it */
 264       asection *found = bfd_get_section_by_name (output_bfd, ".text");
 265
 266       if (found != (asection *) NULL)
 267         {
 268           found->flags |= SEC_READONLY;
 269         }
 270     }
 271
 272   if (link_info.relocateable)
 273     output_bfd->flags &= ~EXEC_P;
 274   else
 275     output_bfd->flags |= EXEC_P;
 276
 277   ldwrite ();
 278
 279   /* Even if we're producing relocateable output, some non-fatal errors should
 280      be reported in the exit status.  (What non-fatal errors, if any, do we
 281      want to ignore for relocateable output?)  */
 282
 283   if (config.make_executable == false && force_make_executable == false)
 284     {
 285       if (trace_files == true)
 286         {
 287           einfo ("%P: link errors found, deleting executable `%s'\n",
 288                  output_filename);
 289         }
 290
 291       if (output_bfd->iostream)
 292         fclose ((FILE *) (output_bfd->iostream));
 293
 294       unlink (output_filename);
 295       xexit (1);
 296     }
 297   else
 298     {
 299       bfd_close (output_bfd);
 300     }
 301
 302   if (config.stats)
 303     {
 304       extern char **environ;
 305       char *lim = (char *) sbrk (0);
 306       long run_time = get_run_time () - start_time;
 307
 308       fprintf (stderr, "%s: total time in link: %ld.%06ld\n",
 309                program_name, run_time / 1000000, run_time % 1000000);
 310       fprintf (stderr, "%s: data size %ld\n", program_name,
 311                (long) (lim - (char *) &environ));
 312     }
 313
 314   /* Prevent remove_output from doing anything, after a successful link.  */
 315   output_filename = NULL;
 316
 317   xexit (0);
 318   return 0;
 319 }
 320
 321 /* We need to find any explicitly given emulation in order to initialize the
 322    state that's needed by the lex&yacc argument parser (parse_args).  */
 323
 324 static char *
 325 get_emulation (argc, argv)
 326      int argc;
 327      char **argv;
 328 {
 329   char *emulation;
 330   int i;
 331
 332   emulation = (char *) getenv (EMULATION_ENVIRON);
 333   if (emulation == NULL)
 334     emulation = DEFAULT_EMULATION;
 335
 336   for (i = 1; i < argc; i++)
 337     {
 338       if (!strncmp (argv[i], "-m", 2))
 339         {
 340           if (argv[i][2] == '\0')
 341             {
 342               /* -m EMUL */
 343               if (i < argc - 1)
 344                 {
 345                   emulation = argv[i + 1];
 346                   i++;
 347                 }
 348               else
 349                 {
 350                   einfo("%P%F: missing argument to -m\n");
 351                 }
 352             }
 353           else if (strcmp (argv[i], "-mips1") == 0
 354                    || strcmp (argv[i], "-mips2") == 0
 355                    || strcmp (argv[i], "-mips3") == 0)
 356             {
 357               /* FIXME: The arguments -mips1, -mips2 and -mips3 are
 358                  passed to the linker by some MIPS compilers.  They
 359                  generally tell the linker to use a slightly different
 360                  library path.  Perhaps someday these should be
 361                  implemented as emulations; until then, we just ignore
 362                  the arguments and hope that nobody ever creates
 363                  emulations named ips1, ips2 or ips3.  */
 364             }
 365           else
 366             {
 367               /* -mEMUL */
 368               emulation = &argv[i][2];
 369             }
 370         }
 371     }
 372
 373   return emulation;
 374 }
 375
 376 /* If directory DIR contains an "ldscripts" subdirectory,
 377    add DIR to the library search path and return true,
 378    else return false.  */
 379
 380 static boolean
 381 check_for_scripts_dir (dir)
 382      char *dir;
 383 {
 384   size_t dirlen;
 385   char *buf;
 386   struct stat s;
 387   boolean res;
 388
 389   dirlen = strlen (dir);
 390   /* sizeof counts the terminating NUL.  */
 391   buf = (char *) xmalloc (dirlen + sizeof("/ldscripts"));
 392   sprintf (buf, "%s/ldscripts", dir);
 393
 394   res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
 395   free (buf);
 396   if (res)
 397     ldfile_add_library_path (dir);
 398   return res;
 399 }
 400
 401 /* Set the default directory for finding script files.
 402    Libraries will be searched for here too, but that's ok.
 403    We look for the "ldscripts" directory in:
 404
 405    SCRIPTDIR (passed from Makefile)
 406    the dir where this program is (for using it from the build tree)
 407    the dir where this program is/../lib (for installing the tool suite elsewhere) */
 408
 409 static void
 410 set_scripts_dir ()
 411 {
 412   char *end, *dir;
 413   size_t dirlen;
 414
 415   if (check_for_scripts_dir (SCRIPTDIR))
 416     return;                     /* We've been installed normally.  */
 417
 418   /* Look for "ldscripts" in the dir where our binary is.  */
 419   end = strrchr (program_name, '/');
 420   if (end)
 421     {
 422       dirlen = end - program_name;
 423       /* Make a copy of program_name in dir.
 424          Leave room for later "/../lib".  */
 425       dir = (char *) xmalloc (dirlen + 8);
 426       strncpy (dir, program_name, dirlen);
 427       dir[dirlen] = '\0';
 428     }
 429   else
 430     {
 431       dirlen = 1;
 432       dir = (char *) xmalloc (dirlen + 8);
 433       strcpy (dir, ".");
 434     }
 435
 436   if (check_for_scripts_dir (dir))
 437     return;                     /* Don't free dir.  */
 438
 439   /* Look for "ldscripts" in <the dir where our binary is>/../lib.  */
 440   strcpy (dir + dirlen, "/../lib");
 441   if (check_for_scripts_dir (dir))
 442     return;
 443
 444   free (dir);                   /* Well, we tried.  */
 445 }
 446
 447 void
 448 add_ysym (name)
 449      const char *name;
 450 {
 451   if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
 452     {
 453       link_info.notice_hash = ((struct bfd_hash_table *)
 454                                xmalloc (sizeof (struct bfd_hash_table)));
 455       if (! bfd_hash_table_init_n (link_info.notice_hash,
 456                                    bfd_hash_newfunc,
 457                                    61))
 458         einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 459     }
 460
 461   if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
 462       == (struct bfd_hash_entry *) NULL)
 463     einfo ("%P%F: bfd_hash_lookup failed: %E\n");
 464 }
 465
 466 /* Handle the -retain-symbols-file option.  */
 467
 468 void
 469 add_keepsyms_file (filename)
 470      const char *filename;
 471 {
 472   FILE *file;
 473   char *buf;
 474   size_t bufsize;
 475   int c;
 476
 477   if (link_info.strip == strip_some)
 478     einfo ("%X%P: error: duplicate retain-symbols-file\n");
 479
 480   file = fopen (filename, "r");
 481   if (file == (FILE *) NULL)
 482     {
 483       bfd_set_error (bfd_error_system_call);
 484       einfo ("%X%P: %s: %E", filename);
 485       return;
 486     }
 487
 488   link_info.keep_hash = ((struct bfd_hash_table *)
 489                          xmalloc (sizeof (struct bfd_hash_table)));
 490   if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
 491     einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 492
 493   bufsize = 100;
 494   buf = (char *) xmalloc (bufsize);
 495
 496   c = getc (file);
 497   while (c != EOF)
 498     {
 499       while (isspace (c))
 500         c = getc (file);
 501
 502       if (c != EOF)
 503         {
 504           size_t len = 0;
 505
 506           while (! isspace (c) && c != EOF)
 507             {
 508               buf[len] = c;
 509               ++len;
 510               if (len >= bufsize)
 511                 {
 512                   bufsize *= 2;
 513                   buf = xrealloc (buf, bufsize);
 514                 }
 515               c = getc (file);
 516             }
 517
 518           buf[len] = '\0';
 519
 520           if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
 521               == (struct bfd_hash_entry *) NULL)
 522             einfo ("%P%F: bfd_hash_lookup for insertion failed: %E");
 523         }
 524     }
 525
 526   if (link_info.strip != strip_none)
 527     einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
 528
 529   link_info.strip = strip_some;
 530 }
 531 \f
 532 /* Callbacks from the BFD linker routines.  */
 533
 534 /* This is called when BFD has decided to include an archive member in
 535    a link.  */
 536
 537 /*ARGSUSED*/
 538 static boolean
 539 add_archive_element (info, abfd, name)
 540      struct bfd_link_info *info;
 541      bfd *abfd;
 542      const char *name;
 543 {
 544   lang_input_statement_type *input;
 545
 546   input = ((lang_input_statement_type *)
 547            xmalloc ((bfd_size_type) sizeof (lang_input_statement_type)));
 548   input->filename = abfd->filename;
 549   input->local_sym_name = abfd->filename;
 550   input->the_bfd = abfd;
 551   input->asymbols = NULL;
 552   input->subfiles = NULL;
 553   input->next = NULL;
 554   input->just_syms_flag = false;
 555   input->loaded = false;
 556   input->chain = NULL;
 557
 558   /* FIXME: This is wrong.  It should point to an entry for the
 559      archive itself.  However, it doesn't seem to matter.  */
 560   input->superfile = NULL;
 561
 562   /* FIXME: The following fields are not set: header.next,
 563      header.type, closed, passive_position, symbol_count, total_size,
 564      next_real_file, is_archive, search_dirs_flag, target, real,
 565      common_section, common_output_section, complained.  This bit of
 566      code is from the old decode_library_subfile function.  I don't
 567      know whether any of those fields matters.  */
 568
 569   ldlang_add_file (input);
 570
 571   if (write_map)
 572     info_msg ("%s needed due to %T\n", abfd->filename, name);
 573
 574   if (trace_files || trace_file_tries)
 575     info_msg ("%I\n", input);
 576
 577   return true;
 578 }
 579
 580 /* This is called when BFD has discovered a symbol which is defined
 581    multiple times.  */
 582
 583 /*ARGSUSED*/
 584 static boolean
 585 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
 586      struct bfd_link_info *info;
 587      const char *name;
 588      bfd *obfd;
 589      asection *osec;
 590      bfd_vma oval;
 591      bfd *nbfd;
 592      asection *nsec;
 593      bfd_vma nval;
 594 {
 595   einfo ("%X%C: multiple definition of `%T'\n",
 596          nbfd, nsec, nval, name);
 597   if (obfd != (bfd *) NULL)
 598     einfo ("%C: first defined here\n", obfd, osec, oval);
 599   return true;
 600 }
 601
 602 /* This is called when there is a definition of a common symbol, or
 603    when a common symbol is found for a symbol that is already defined,
 604    or when two common symbols are found.  We only do something if
 605    -warn-common was used.  */
 606
 607 /*ARGSUSED*/
 608 static boolean
 609 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
 610      struct bfd_link_info *info;
 611      const char *name;
 612      bfd *obfd;
 613      enum bfd_link_hash_type otype;
 614      bfd_vma osize;
 615      bfd *nbfd;
 616      enum bfd_link_hash_type ntype;
 617      bfd_vma nsize;
 618 {
 619   if (! config.warn_common)
 620     return true;
 621
 622   if (ntype == bfd_link_hash_defined)
 623     {
 624       ASSERT (otype == bfd_link_hash_common);
 625       einfo ("%B: warning: definition of `%T' overriding common\n",
 626              nbfd, name);
 627       einfo ("%B: warning: common is here\n", obfd);
 628     }
 629   else if (otype == bfd_link_hash_defined)
 630     {
 631       ASSERT (ntype == bfd_link_hash_common);
 632       einfo ("%B: warning: common of `%T' overridden by definition\n",
 633              nbfd, name);
 634       einfo ("%B: warning: defined here\n", obfd);
 635     }
 636   else
 637     {
 638       ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
 639       if (osize > nsize)
 640         {
 641           einfo ("%B: warning: common of `%T' overridden by larger common\n",
 642                  nbfd, name);
 643           einfo ("%B: warning: larger common is here\n", obfd);
 644         }
 645       else if (nsize > osize)
 646         {
 647           einfo ("%B: warning: common of `%T' overriding smaller common\n",
 648                  nbfd, name);
 649           einfo ("%B: warning: smaller common is here\n", obfd);
 650         }
 651       else
 652         {
 653           einfo ("%B: warning: multiple common of `%T'\n", nbfd, name);
 654           einfo ("%B: warning: previous common is here\n", obfd);
 655         }
 656     }
 657
 658   return true;
 659 }
 660
 661 /* This is called when BFD has discovered a set element.  H is the
 662    entry in the linker hash table for the set.  SECTION and VALUE
 663    represent a value which should be added to the set.  */
 664
 665 /*ARGSUSED*/
 666 static boolean
 667 add_to_set (info, h, bitsize, abfd, section, value)
 668      struct bfd_link_info *info;
 669      struct bfd_link_hash_entry *h;
 670      unsigned int bitsize;
 671      bfd *abfd;
 672      asection *section;
 673      bfd_vma value;
 674 {
 675   ldctor_add_set_entry (h, bitsize, section, value);
 676   return true;
 677 }
 678
 679 /* This is called when BFD has discovered a constructor.  This is only
 680    called for some object file formats--those which do not handle
 681    constructors in some more clever fashion.  This is similar to
 682    adding an element to a set, but less general.  */
 683
 684 static boolean
 685 constructor_callback (info, constructor, bitsize, name, abfd, section, value)
 686      struct bfd_link_info *info;
 687      boolean constructor;
 688      unsigned int bitsize;
 689      const char *name;
 690      bfd *abfd;
 691      asection *section;
 692      bfd_vma value;
 693 {
 694   char *set_name;
 695   char *s;
 696   struct bfd_link_hash_entry *h;
 697
 698   if (! config.build_constructors)
 699     return true;
 700
 701   set_name = (char *) alloca (1 + sizeof "__CTOR_LIST__");
 702   s = set_name;
 703   if (bfd_get_symbol_leading_char (abfd) != '\0')
 704     *s++ = bfd_get_symbol_leading_char (abfd);
 705   if (constructor)
 706     strcpy (s, "__CTOR_LIST__");
 707   else
 708     strcpy (s, "__DTOR_LIST__");
 709
 710   if (write_map)
 711     info_msg ("Adding %s to constructor/destructor set %s\n", name, set_name);
 712
 713   h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
 714   if (h == (struct bfd_link_hash_entry *) NULL)
 715     einfo ("%P%F: bfd_link_hash_lookup failed: %E");
 716   if (h->type == bfd_link_hash_new)
 717     {
 718       h->type = bfd_link_hash_undefined;
 719       h->u.undef.abfd = abfd;
 720       /* We don't call bfd_link_add_undef to add this to the list of
 721          undefined symbols because we are going to define it
 722          ourselves.  */
 723     }
 724
 725   ldctor_add_set_entry (h, bitsize, section, value);
 726   return true;
 727 }
 728
 729 /* This is called when there is a reference to a warning symbol.  */
 730
 731 /*ARGSUSED*/
 732 static boolean
 733 warning_callback (info, warning)
 734      struct bfd_link_info *info;
 735      const char *warning;
 736 {
 737   einfo ("%P: %s\n", warning);
 738   return true;
 739 }
 740
 741 /* This is called when an undefined symbol is found.  */
 742
 743 /*ARGSUSED*/
 744 static boolean
 745 undefined_symbol (info, name, abfd, section, address)
 746      struct bfd_link_info *info;
 747      const char *name;
 748      bfd *abfd;
 749      asection *section;
 750      bfd_vma address;
 751 {
 752   static char *error_name;
 753   static unsigned int error_count;
 754
 755 #define MAX_ERRORS_IN_A_ROW 5
 756
 757   /* We never print more than a reasonable number of errors in a row
 758      for a single symbol.  */
 759   if (error_name != (char *) NULL
 760       && strcmp (name, error_name) == 0)
 761     ++error_count;
 762   else
 763     {
 764       error_count = 0;
 765       if (error_name != (char *) NULL)
 766         free (error_name);
 767       error_name = buystring (name);
 768     }
 769
 770   if (error_count < MAX_ERRORS_IN_A_ROW)
 771     einfo ("%X%C: undefined reference to `%T'\n",
 772            abfd, section, address, name);
 773   else if (error_count == MAX_ERRORS_IN_A_ROW)
 774     einfo ("%C: more undefined references to `%T' follow\n",
 775            abfd, section, address, name);
 776
 777   return true;
 778 }
 779
 780 /* This is called when a reloc overflows.  */
 781
 782 /*ARGSUSED*/
 783 static boolean
 784 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
 785      struct bfd_link_info *info;
 786      const char *name;
 787      const char *reloc_name;
 788      bfd_vma addend;
 789      bfd *abfd;
 790      asection *section;
 791      bfd_vma address;
 792 {
 793   einfo ("%X%C: relocation truncated to fit: %s %T", abfd, section,
 794          address, reloc_name, name);
 795   if (addend != 0)
 796     einfo ("+%v", addend);
 797   einfo ("\n");
 798   return true;
 799 }
 800
 801 /* This is called when a dangerous relocation is made.  */
 802
 803 /*ARGSUSED*/
 804 static boolean
 805 reloc_dangerous (info, message, abfd, section, address)
 806      struct bfd_link_info *info;
 807      const char *message;
 808      bfd *abfd;
 809      asection *section;
 810      bfd_vma address;
 811 {
 812   einfo ("%X%C: dangerous relocation: %s\n", abfd, section, address, message);
 813   return true;
 814 }
 815
 816 /* This is called when a reloc is being generated attached to a symbol
 817    that is not being output.  */
 818
 819 /*ARGSUSED*/
 820 static boolean
 821 unattached_reloc (info, name, abfd, section, address)
 822      struct bfd_link_info *info;
 823      const char *name;
 824      bfd *abfd;
 825      asection *section;
 826      bfd_vma address;
 827 {
 828   einfo ("%X%C: reloc refers to symbol `%T' which is not being output\n",
 829          abfd, section, address, name);
 830   return true;
 831 }
 832
 833 /* This is called when a symbol in notice_hash is found.  Symbols are
 834    put in notice_hash using the -y option.  */
 835
 836 /*ARGSUSED*/
 837 static boolean
 838 notice_ysym (info, name, abfd, section, value)
 839      struct bfd_link_info *info;
 840      const char *name;
 841      bfd *abfd;
 842      asection *section;
 843      bfd_vma value;
 844 {
 845   einfo ("%B: %s %s\n", abfd,
 846          section != &bfd_und_section ? "definition of" : "reference to",
 847          name);
 848   return true;
 849 }