ld/ldmain.c

   1 /* Main program of GNU linker.
   2    Copyright (C) 1991, 1993, 1994 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 "bfdlink.h"
  26
  27 #include "config.h"
  28 #include "ld.h"
  29 #include "ldmain.h"
  30 #include "ldmisc.h"
  31 #include "ldwrite.h"
  32 #include "ldgram.h"
  33 #include "ldexp.h"
  34 #include "ldlang.h"
  35 #include "ldemul.h"
  36 #include "ldlex.h"
  37 #include "ldfile.h"
  38 #include "ldctor.h"
  39
  40 /* Somewhere above, sys/stat.h got included . . . . */
  41 #if !defined(S_ISDIR) && defined(S_IFDIR)
  42 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
  43 #endif
  44
  45 #include <string.h>
  46
  47 static char *get_emulation PARAMS ((int, char **));
  48 static void set_scripts_dir PARAMS ((void));
  49
  50 /* EXPORTS */
  51
  52 char *default_target;
  53 const char *output_filename = "a.out";
  54
  55 /* Name this program was invoked by.  */
  56 char *program_name;
  57
  58 /* The file that we're creating */
  59 bfd *output_bfd = 0;
  60
  61 /* Set by -G argument, for MIPS ECOFF target.  */
  62 int g_switch_value = 8;
  63
  64 /* Nonzero means print names of input files as processed.  */
  65 boolean trace_files;
  66
  67 /* Nonzero means same, but note open failures, too.  */
  68 boolean trace_file_tries;
  69
  70 /* 1 => write load map.  */
  71 boolean write_map;
  72
  73 args_type command_line;
  74
  75 ld_config_type config;
  76
  77 static boolean check_for_scripts_dir PARAMS ((char *dir));
  78 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
  79                                             const char *));
  80 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
  81                                             const char *,
  82                                             bfd *, asection *, bfd_vma,
  83                                             bfd *, asection *, bfd_vma));
  84 static boolean multiple_common PARAMS ((struct bfd_link_info *,
  85                                         const char *, bfd *,
  86                                         enum bfd_link_hash_type, bfd_vma,
  87                                         bfd *, enum bfd_link_hash_type,
  88                                         bfd_vma));
  89 static boolean add_to_set PARAMS ((struct bfd_link_info *,
  90                                    struct bfd_link_hash_entry *,
  91                                    unsigned int bitsize,
  92                                    bfd *, asection *, bfd_vma));
  93 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
  94                                              boolean constructor,
  95                                              unsigned int bitsize,
  96                                              const char *name,
  97                                              bfd *, asection *, bfd_vma));
  98 static boolean warning_callback PARAMS ((struct bfd_link_info *,
  99                                          const char *));
 100 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
 101                                          const char *, bfd *,
 102                                          asection *, bfd_vma));
 103 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
 104                                        const char *, bfd_vma,
 105                                        bfd *, asection *, bfd_vma));
 106 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
 107                                         bfd *, asection *, bfd_vma));
 108 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
 109                                          const char *, bfd *, asection *,
 110                                          bfd_vma));
 111 static boolean notice_ysym PARAMS ((struct bfd_link_info *, const char *,
 112                                     bfd *, asection *, bfd_vma));
 113
 114 static struct bfd_link_callbacks link_callbacks =
 115 {
 116   add_archive_element,
 117   multiple_definition,
 118   multiple_common,
 119   add_to_set,
 120   constructor_callback,
 121   warning_callback,
 122   undefined_symbol,
 123   reloc_overflow,
 124   reloc_dangerous,
 125   unattached_reloc,
 126   notice_ysym
 127 };
 128
 129 struct bfd_link_info link_info;
 130 \f
 131 extern int main PARAMS ((int, char **));
 132
 133 int
 134 main (argc, argv)
 135      int argc;
 136      char **argv;
 137 {
 138   char *emulation;
 139   long start_time = get_run_time ();
 140
 141   program_name = argv[0];
 142
 143   bfd_init ();
 144
 145   /* Initialize the data about options.  */
 146   trace_files = trace_file_tries = false;
 147   write_map = false;
 148   config.build_constructors = true;
 149   command_line.force_common_definition = false;
 150
 151   link_info.callbacks = &link_callbacks;
 152   link_info.relocateable = false;
 153   link_info.strip = strip_none;
 154   link_info.discard = discard_none;
 155   link_info.lprefix_len = 1;
 156   link_info.lprefix = "L";
 157   link_info.keep_memory = true;
 158   link_info.input_bfds = NULL;
 159   link_info.create_object_symbols_section = NULL;
 160   link_info.hash = NULL;
 161   link_info.keep_hash = NULL;
 162   link_info.notice_hash = NULL;
 163
 164   ldfile_add_arch ("");
 165
 166   config.make_executable = true;
 167   force_make_executable = false;
 168   config.magic_demand_paged = true;
 169   config.text_read_only = true;
 170   config.make_executable = true;
 171
 172   emulation = get_emulation (argc, argv);
 173   ldemul_choose_mode (emulation);
 174   default_target = ldemul_choose_target ();
 175   lang_init ();
 176   ldemul_before_parse ();
 177   lang_has_input_file = false;
 178   parse_args (argc, argv);
 179
 180   /* This essentially adds another -L directory so this must be done after
 181      the -L's in argv have been processed.  */
 182   set_scripts_dir ();
 183
 184   if (had_script == false)
 185     {
 186       /* Read the emulation's appropriate default script.  */
 187       int isfile;
 188       char *s = ldemul_get_script (&isfile);
 189
 190       if (isfile)
 191         {
 192           /* sizeof counts the terminating NUL.  */
 193           size_t size = strlen (s) + sizeof ("-T ");
 194           char *buf = (char *) ldmalloc(size);
 195           sprintf (buf, "-T %s", s);
 196           parse_line (buf, 0);
 197           free (buf);
 198         }
 199       else
 200         parse_line (s, 1);
 201     }
 202
 203   if (link_info.relocateable && command_line.relax)
 204     {
 205       einfo ("%P%F: -relax and -r may not be used together\n");
 206     }
 207   lang_final ();
 208
 209   if (lang_has_input_file == false)
 210     {
 211       einfo ("%P%F: no input files\n");
 212     }
 213
 214   if (trace_files)
 215     {
 216       info_msg ("%P: mode %s\n", emulation);
 217     }
 218
 219   ldemul_after_parse ();
 220
 221
 222   if (config.map_filename)
 223     {
 224       if (strcmp (config.map_filename, "-") == 0)
 225         {
 226           config.map_file = stdout;
 227         }
 228       else
 229         {
 230           config.map_file = fopen (config.map_filename, FOPEN_WT);
 231           if (config.map_file == (FILE *) NULL)
 232             {
 233               einfo ("%P%F: cannot open map file %s: %E\n",
 234                      config.map_filename);
 235             }
 236         }
 237     }
 238
 239
 240   lang_process ();
 241
 242   /* Print error messages for any missing symbols, for any warning
 243      symbols, and possibly multiple definitions */
 244
 245
 246   if (config.text_read_only)
 247     {
 248       /* Look for a text section and mark the readonly attribute in it */
 249       asection *found = bfd_get_section_by_name (output_bfd, ".text");
 250
 251       if (found != (asection *) NULL)
 252         {
 253           found->flags |= SEC_READONLY;
 254         }
 255     }
 256
 257   if (link_info.relocateable)
 258     output_bfd->flags &= ~EXEC_P;
 259   else
 260     output_bfd->flags |= EXEC_P;
 261
 262   ldwrite ();
 263
 264   /* Even if we're producing relocateable output, some non-fatal errors should
 265      be reported in the exit status.  (What non-fatal errors, if any, do we
 266      want to ignore for relocateable output?)  */
 267
 268   if (config.make_executable == false && force_make_executable == false)
 269     {
 270       if (trace_files == true)
 271         {
 272           einfo ("%P: link errors found, deleting executable `%s'\n",
 273                  output_filename);
 274         }
 275
 276       if (output_bfd->iostream)
 277         fclose ((FILE *) (output_bfd->iostream));
 278
 279       unlink (output_filename);
 280       exit (1);
 281     }
 282   else
 283     {
 284       bfd_close (output_bfd);
 285     }
 286
 287   if (config.stats)
 288     {
 289       extern char **environ;
 290       char *lim = (char *) sbrk (0);
 291       long run_time = get_run_time () - start_time;
 292
 293       fprintf (stderr, "%s: total time in link: %d.%06d\n",
 294                program_name, run_time / 1000000, run_time % 1000000);
 295       fprintf (stderr, "%s: data size %ld\n", program_name,
 296                (long) (lim - (char *) &environ));
 297     }
 298
 299   exit (0);
 300   return 0;
 301 }
 302
 303 /* We need to find any explicitly given emulation in order to initialize the
 304    state that's needed by the lex&yacc argument parser (parse_args).  */
 305
 306 static char *
 307 get_emulation (argc, argv)
 308      int argc;
 309      char **argv;
 310 {
 311   char *emulation;
 312   int i;
 313
 314   emulation = (char *) getenv (EMULATION_ENVIRON);
 315   if (emulation == NULL)
 316     emulation = DEFAULT_EMULATION;
 317
 318   for (i = 1; i < argc; i++)
 319     {
 320       if (!strncmp (argv[i], "-m", 2))
 321         {
 322           if (argv[i][2] == '\0')
 323             {
 324               /* -m EMUL */
 325               if (i < argc - 1)
 326                 {
 327                   emulation = argv[i + 1];
 328                   i++;
 329                 }
 330               else
 331                 {
 332                   einfo("%P%F: missing argument to -m\n");
 333                 }
 334             }
 335           else if (strcmp (argv[i], "-mips1") == 0
 336                    || strcmp (argv[i], "-mips2") == 0
 337                    || strcmp (argv[i], "-mips3") == 0)
 338             {
 339               /* FIXME: The arguments -mips1, -mips2 and -mips3 are
 340                  passed to the linker by some MIPS compilers.  They
 341                  generally tell the linker to use a slightly different
 342                  library path.  Perhaps someday these should be
 343                  implemented as emulations; until then, we just ignore
 344                  the arguments and hope that nobody ever creates
 345                  emulations named ips1, ips2 or ips3.  */
 346             }
 347           else
 348             {
 349               /* -mEMUL */
 350               emulation = &argv[i][2];
 351             }
 352         }
 353     }
 354
 355   return emulation;
 356 }
 357
 358 /* If directory DIR contains an "ldscripts" subdirectory,
 359    add DIR to the library search path and return true,
 360    else return false.  */
 361
 362 static boolean
 363 check_for_scripts_dir (dir)
 364      char *dir;
 365 {
 366   size_t dirlen;
 367   char *buf;
 368   struct stat s;
 369   boolean res;
 370
 371   dirlen = strlen (dir);
 372   /* sizeof counts the terminating NUL.  */
 373   buf = (char *) ldmalloc (dirlen + sizeof("/ldscripts"));
 374   sprintf (buf, "%s/ldscripts", dir);
 375
 376   res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
 377   free (buf);
 378   if (res)
 379     ldfile_add_library_path (dir);
 380   return res;
 381 }
 382
 383 /* Set the default directory for finding script files.
 384    Libraries will be searched for here too, but that's ok.
 385    We look for the "ldscripts" directory in:
 386
 387    SCRIPTDIR (passed from Makefile)
 388    the dir where this program is (for using it from the build tree)
 389    the dir where this program is/../lib (for installing the tool suite elsewhere) */
 390
 391 static void
 392 set_scripts_dir ()
 393 {
 394   char *end, *dir;
 395   size_t dirlen;
 396
 397   if (check_for_scripts_dir (SCRIPTDIR))
 398     return;                     /* We've been installed normally.  */
 399
 400   /* Look for "ldscripts" in the dir where our binary is.  */
 401   end = strrchr (program_name, '/');
 402   if (end)
 403     {
 404       dirlen = end - program_name;
 405       /* Make a copy of program_name in dir.
 406          Leave room for later "/../lib".  */
 407       dir = (char *) ldmalloc (dirlen + 8);
 408       strncpy (dir, program_name, dirlen);
 409       dir[dirlen] = '\0';
 410     }
 411   else
 412     {
 413       dirlen = 1;
 414       dir = (char *) ldmalloc (dirlen + 8);
 415       strcpy (dir, ".");
 416     }
 417
 418   if (check_for_scripts_dir (dir))
 419     return;                     /* Don't free dir.  */
 420
 421   /* Look for "ldscripts" in <the dir where our binary is>/../lib.  */
 422   strcpy (dir + dirlen, "/../lib");
 423   if (check_for_scripts_dir (dir))
 424     return;
 425
 426   free (dir);                   /* Well, we tried.  */
 427 }
 428
 429 void
 430 add_ysym (name)
 431      const char *name;
 432 {
 433   if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
 434     {
 435       link_info.notice_hash = ((struct bfd_hash_table *)
 436                                ldmalloc (sizeof (struct bfd_hash_table)));
 437       if (! bfd_hash_table_init_n (link_info.notice_hash,
 438                                    bfd_hash_newfunc,
 439                                    61))
 440         einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 441     }
 442
 443   if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
 444       == (struct bfd_hash_entry *) NULL)
 445     einfo ("%P%F: bfd_hash_lookup failed: %E\n");
 446 }
 447
 448 /* Handle the -retain-symbols-file option.  */
 449
 450 void
 451 add_keepsyms_file (filename)
 452      const char *filename;
 453 {
 454   FILE *file;
 455   char *buf;
 456   size_t bufsize;
 457   int c;
 458
 459   if (link_info.strip == strip_some)
 460     einfo ("%X%P: error: duplicate retain-symbols-file\n");
 461
 462   file = fopen (filename, "r");
 463   if (file == (FILE *) NULL)
 464     {
 465       bfd_error = system_call_error;
 466       einfo ("%X%P: %s: %E", filename);
 467       return;
 468     }
 469
 470   link_info.keep_hash = ((struct bfd_hash_table *)
 471                          ldmalloc (sizeof (struct bfd_hash_table)));
 472   if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
 473     einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 474
 475   bufsize = 100;
 476   buf = (char *) ldmalloc (bufsize);
 477
 478   c = getc (file);
 479   while (c != EOF)
 480     {
 481       while (isspace (c))
 482         c = getc (file);
 483
 484       if (c != EOF)
 485         {
 486           size_t len = 0;
 487
 488           while (! isspace (c) && c != EOF)
 489             {
 490               buf[len] = c;
 491               ++len;
 492               if (len >= bufsize)
 493                 {
 494                   bufsize *= 2;
 495                   buf = ldrealloc (buf, bufsize);
 496                 }
 497               c = getc (file);
 498             }
 499
 500           buf[len] = '\0';
 501
 502           if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
 503               == (struct bfd_hash_entry *) NULL)
 504             einfo ("%P%F: bfd_hash_lookup for insertion failed: %E");
 505         }
 506     }
 507
 508   if (link_info.strip != strip_none)
 509     einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
 510
 511   link_info.strip = strip_some;
 512 }
 513 \f
 514 /* Callbacks from the BFD linker routines.  */
 515
 516 /* This is called when BFD has decided to include an archive member in
 517    a link.  */
 518
 519 /*ARGSUSED*/
 520 static boolean
 521 add_archive_element (info, abfd, name)
 522      struct bfd_link_info *info;
 523      bfd *abfd;
 524      const char *name;
 525 {
 526   lang_input_statement_type *input;
 527
 528   input = ((lang_input_statement_type *)
 529            ldmalloc ((bfd_size_type) sizeof (lang_input_statement_type)));
 530   input->filename = abfd->filename;
 531   input->local_sym_name = abfd->filename;
 532   input->the_bfd = abfd;
 533   input->asymbols = NULL;
 534   input->subfiles = NULL;
 535   input->next = NULL;
 536   input->just_syms_flag = false;
 537   input->loaded = false;
 538   input->chain = NULL;
 539
 540   /* FIXME: This is wrong.  It should point to an entry for the
 541      archive itself.  However, it doesn't seem to matter.  */
 542   input->superfile = NULL;
 543
 544   /* FIXME: The following fields are not set: header.next,
 545      header.type, closed, passive_position, symbol_count, total_size,
 546      next_real_file, is_archive, search_dirs_flag, target, real,
 547      common_section, common_output_section, complained.  This bit of
 548      code is from the old decode_library_subfile function.  I don't
 549      know whether any of those fields matters.  */
 550
 551   ldlang_add_file (input);
 552
 553   if (write_map)
 554     info_msg ("%s needed due to %T\n", abfd->filename, name);
 555
 556   if (trace_files || trace_file_tries)
 557     info_msg ("%I\n", input);
 558
 559   return true;
 560 }
 561
 562 /* This is called when BFD has discovered a symbol which is defined
 563    multiple times.  */
 564
 565 /*ARGSUSED*/
 566 static boolean
 567 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
 568      struct bfd_link_info *info;
 569      const char *name;
 570      bfd *obfd;
 571      asection *osec;
 572      bfd_vma oval;
 573      bfd *nbfd;
 574      asection *nsec;
 575      bfd_vma nval;
 576 {
 577   einfo ("%X%C: multiple definition of `%T'\n",
 578          nbfd, nsec, nval, name);
 579   if (obfd != (bfd *) NULL)
 580     einfo ("%C: first defined here\n", obfd, osec, oval);
 581   return true;
 582 }
 583
 584 /* This is called when there is a definition of a common symbol, or
 585    when a common symbol is found for a symbol that is already defined,
 586    or when two common symbols are found.  We only do something if
 587    -warn-common was used.  */
 588
 589 /*ARGSUSED*/
 590 static boolean
 591 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
 592      struct bfd_link_info *info;
 593      const char *name;
 594      bfd *obfd;
 595      enum bfd_link_hash_type otype;
 596      bfd_vma osize;
 597      bfd *nbfd;
 598      enum bfd_link_hash_type ntype;
 599      bfd_vma nsize;
 600 {
 601   if (! config.warn_common)
 602     return true;
 603
 604   if (ntype == bfd_link_hash_defined)
 605     {
 606       ASSERT (otype == bfd_link_hash_common);
 607       einfo ("%B: warning: definition of `%T' overriding common\n",
 608              nbfd, name);
 609       einfo ("%B: warning: common is here\n", obfd);
 610     }
 611   else if (otype == bfd_link_hash_defined)
 612     {
 613       ASSERT (ntype == bfd_link_hash_common);
 614       einfo ("%B: warning: common of `%T' overridden by definition\n",
 615              nbfd, name);
 616       einfo ("%B: warning: defined here\n", obfd);
 617     }
 618   else
 619     {
 620       ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
 621       if (osize > nsize)
 622         {
 623           einfo ("%B: warning: common of `%T' overridden by larger common\n",
 624                  nbfd, name);
 625           einfo ("%B: warning: larger common is here\n", obfd);
 626         }
 627       else if (nsize > osize)
 628         {
 629           einfo ("%B: warning: common of `%T' overriding smaller common\n",
 630                  nbfd, name);
 631           einfo ("%B: warning: smaller common is here\n", obfd);
 632         }
 633       else
 634         {
 635           einfo ("%B: warning: multiple common of `%T'\n", nbfd, name);
 636           einfo ("%B: warning: previous common is here\n", obfd);
 637         }
 638     }
 639
 640   return true;
 641 }
 642
 643 /* This is called when BFD has discovered a set element.  H is the
 644    entry in the linker hash table for the set.  SECTION and VALUE
 645    represent a value which should be added to the set.  */
 646
 647 /*ARGSUSED*/
 648 static boolean
 649 add_to_set (info, h, bitsize, abfd, section, value)
 650      struct bfd_link_info *info;
 651      struct bfd_link_hash_entry *h;
 652      unsigned int bitsize;
 653      bfd *abfd;
 654      asection *section;
 655      bfd_vma value;
 656 {
 657   ldctor_add_set_entry (h, bitsize, section, value);
 658   return true;
 659 }
 660
 661 /* This is called when BFD has discovered a constructor.  This is only
 662    called for some object file formats--those which do not handle
 663    constructors in some more clever fashion.  This is similar to
 664    adding an element to a set, but less general.  */
 665
 666 static boolean
 667 constructor_callback (info, constructor, bitsize, name, abfd, section, value)
 668      struct bfd_link_info *info;
 669      boolean constructor;
 670      unsigned int bitsize;
 671      const char *name;
 672      bfd *abfd;
 673      asection *section;
 674      bfd_vma value;
 675 {
 676   char *set_name;
 677   char *s;
 678   struct bfd_link_hash_entry *h;
 679
 680   if (! config.build_constructors)
 681     return true;
 682
 683   set_name = (char *) alloca (1 + sizeof "__CTOR_LIST__");
 684   s = set_name;
 685   if (bfd_get_symbol_leading_char (abfd) != '\0')
 686     *s++ = bfd_get_symbol_leading_char (abfd);
 687   if (constructor)
 688     strcpy (s, "__CTOR_LIST__");
 689   else
 690     strcpy (s, "__DTOR_LIST__");
 691
 692   if (write_map)
 693     info_msg ("Adding %s to constructor/destructor set %s\n", name, set_name);
 694
 695   h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
 696   if (h == (struct bfd_link_hash_entry *) NULL)
 697     einfo ("%P%F: bfd_link_hash_lookup failed: %E");
 698   if (h->type == bfd_link_hash_new)
 699     {
 700       h->type = bfd_link_hash_undefined;
 701       h->u.undef.abfd = abfd;
 702       /* We don't call bfd_link_add_undef to add this to the list of
 703          undefined symbols because we are going to define it
 704          ourselves.  */
 705     }
 706
 707   ldctor_add_set_entry (h, bitsize, section, value);
 708   return true;
 709 }
 710
 711 /* This is called when there is a reference to a warning symbol.  */
 712
 713 /*ARGSUSED*/
 714 static boolean
 715 warning_callback (info, warning)
 716      struct bfd_link_info *info;
 717      const char *warning;
 718 {
 719   einfo ("%P: %s\n", warning);
 720   return true;
 721 }
 722
 723 /* This is called when an undefined symbol is found.  */
 724
 725 /*ARGSUSED*/
 726 static boolean
 727 undefined_symbol (info, name, abfd, section, address)
 728      struct bfd_link_info *info;
 729      const char *name;
 730      bfd *abfd;
 731      asection *section;
 732      bfd_vma address;
 733 {
 734   static char *error_name;
 735   static unsigned int error_count;
 736
 737 #define MAX_ERRORS_IN_A_ROW 5
 738
 739   /* We never print more than a reasonable number of errors in a row
 740      for a single symbol.  */
 741   if (error_name != (char *) NULL
 742       && strcmp (name, error_name) == 0)
 743     ++error_count;
 744   else
 745     {
 746       error_count = 0;
 747       if (error_name != (char *) NULL)
 748         free (error_name);
 749       error_name = buystring (name);
 750     }
 751
 752   if (error_count < MAX_ERRORS_IN_A_ROW)
 753     einfo ("%X%C: undefined reference to `%T'\n",
 754            abfd, section, address, name);
 755   else if (error_count == MAX_ERRORS_IN_A_ROW)
 756     einfo ("%C: more undefined references to `%T' follow\n",
 757            abfd, section, address, name);
 758
 759   return true;
 760 }
 761
 762 /* This is called when a reloc overflows.  */
 763
 764 /*ARGSUSED*/
 765 static boolean
 766 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
 767      struct bfd_link_info *info;
 768      const char *name;
 769      const char *reloc_name;
 770      bfd_vma addend;
 771      bfd *abfd;
 772      asection *section;
 773      bfd_vma address;
 774 {
 775   einfo ("%X%C: relocation truncated to fit: %s %T", abfd, section,
 776          address, reloc_name, name);
 777   if (addend != 0)
 778     einfo ("+%v", addend);
 779   einfo ("\n");
 780   return true;
 781 }
 782
 783 /* This is called when a dangerous relocation is made.  */
 784
 785 /*ARGSUSED*/
 786 static boolean
 787 reloc_dangerous (info, message, abfd, section, address)
 788      struct bfd_link_info *info;
 789      const char *message;
 790      bfd *abfd;
 791      asection *section;
 792      bfd_vma address;
 793 {
 794   einfo ("%X%C: dangerous relocation: %s\n", abfd, section, address, message);
 795   return true;
 796 }
 797
 798 /* This is called when a reloc is being generated attached to a symbol
 799    that is not being output.  */
 800
 801 /*ARGSUSED*/
 802 static boolean
 803 unattached_reloc (info, name, abfd, section, address)
 804      struct bfd_link_info *info;
 805      const char *name;
 806      bfd *abfd;
 807      asection *section;
 808      bfd_vma address;
 809 {
 810   einfo ("%X%C: reloc refers to symbol `%T' which is not being output\n",
 811          abfd, section, address, name);
 812   return true;
 813 }
 814
 815 /* This is called when a symbol in notice_hash is found.  Symbols are
 816    put in notice_hash using the -y option.  */
 817
 818 /*ARGSUSED*/
 819 static boolean
 820 notice_ysym (info, name, abfd, section, value)
 821      struct bfd_link_info *info;
 822      const char *name;
 823      bfd *abfd;
 824      asection *section;
 825      bfd_vma value;
 826 {
 827   einfo ("%B: %s %s\n", abfd,
 828          section != &bfd_und_section ? "definition of" : "reference to",
 829          name);
 830   return true;
 831 }