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 "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 /* Nonzero means version number was printed, so exit successfully
  71    instead of complaining if no input files are given.  */
  72 boolean version_printed;
  73
  74 /* 1 => write load map.  */
  75 boolean write_map;
  76
  77 args_type command_line;
  78
  79 ld_config_type config;
  80
  81 static boolean check_for_scripts_dir PARAMS ((char *dir));
  82 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
  83                                             const char *));
  84 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
  85                                             const char *,
  86                                             bfd *, asection *, bfd_vma,
  87                                             bfd *, asection *, bfd_vma));
  88 static boolean multiple_common PARAMS ((struct bfd_link_info *,
  89                                         const char *, bfd *,
  90                                         enum bfd_link_hash_type, bfd_vma,
  91                                         bfd *, enum bfd_link_hash_type,
  92                                         bfd_vma));
  93 static boolean add_to_set PARAMS ((struct bfd_link_info *,
  94                                    struct bfd_link_hash_entry *,
  95                                    unsigned int bitsize,
  96                                    bfd *, asection *, bfd_vma));
  97 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
  98                                              boolean constructor,
  99                                              unsigned int bitsize,
 100                                              const char *name,
 101                                              bfd *, asection *, bfd_vma));
 102 static boolean warning_callback PARAMS ((struct bfd_link_info *,
 103                                          const char *));
 104 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
 105                                          const char *, bfd *,
 106                                          asection *, bfd_vma));
 107 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
 108                                        const char *, bfd_vma,
 109                                        bfd *, asection *, bfd_vma));
 110 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
 111                                         bfd *, asection *, bfd_vma));
 112 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
 113                                          const char *, bfd *, asection *,
 114                                          bfd_vma));
 115 static boolean notice_ysym PARAMS ((struct bfd_link_info *, const char *,
 116                                     bfd *, asection *, bfd_vma));
 117
 118 static struct bfd_link_callbacks link_callbacks =
 119 {
 120   add_archive_element,
 121   multiple_definition,
 122   multiple_common,
 123   add_to_set,
 124   constructor_callback,
 125   warning_callback,
 126   undefined_symbol,
 127   reloc_overflow,
 128   reloc_dangerous,
 129   unattached_reloc,
 130   notice_ysym
 131 };
 132
 133 struct bfd_link_info link_info;
 134 \f
 135 static void
 136 remove_output ()
 137 {
 138   if (output_filename)
 139     {
 140       if (output_bfd && output_bfd->iostream)
 141         fclose((FILE *)(output_bfd->iostream));
 142       if (delete_output_file_on_failure)
 143         unlink (output_filename);
 144     }
 145 }
 146
 147 /* Prevent remove_output from doing anything.
 148    Called after a successful link.  */
 149
 150 static void
 151 preserve_output ()
 152 {
 153   output_filename = NULL;
 154 }
 155
 156 int
 157 main (argc, argv)
 158      int argc;
 159      char **argv;
 160 {
 161   char *emulation;
 162   long start_time = get_run_time ();
 163
 164   program_name = argv[0];
 165
 166   bfd_init ();
 167
 168   atexit (remove_output);
 169
 170   /* Initialize the data about options.  */
 171   trace_files = trace_file_tries = version_printed = false;
 172   write_map = false;
 173   config.build_constructors = true;
 174   command_line.force_common_definition = false;
 175
 176   link_info.callbacks = &link_callbacks;
 177   link_info.relocateable = false;
 178   link_info.strip = strip_none;
 179   link_info.discard = discard_none;
 180   link_info.lprefix_len = 1;
 181   link_info.lprefix = "L";
 182   link_info.keep_memory = true;
 183   link_info.input_bfds = NULL;
 184   link_info.create_object_symbols_section = NULL;
 185   link_info.hash = NULL;
 186   link_info.keep_hash = NULL;
 187   link_info.notice_hash = NULL;
 188
 189   ldfile_add_arch ("");
 190
 191   config.make_executable = true;
 192   force_make_executable = false;
 193   config.magic_demand_paged = true;
 194   config.text_read_only = true;
 195   config.make_executable = true;
 196
 197   emulation = get_emulation (argc, argv);
 198   ldemul_choose_mode (emulation);
 199   default_target = ldemul_choose_target ();
 200   lang_init ();
 201   ldemul_before_parse ();
 202   lang_has_input_file = false;
 203   parse_args (argc, argv);
 204
 205   /* This essentially adds another -L directory so this must be done after
 206      the -L's in argv have been processed.  */
 207   set_scripts_dir ();
 208
 209   if (had_script == false)
 210     {
 211       /* Read the emulation's appropriate default script.  */
 212       int isfile;
 213       char *s = ldemul_get_script (&isfile);
 214
 215       if (isfile)
 216         {
 217           /* sizeof counts the terminating NUL.  */
 218           size_t size = strlen (s) + sizeof ("-T ");
 219           char *buf = (char *) xmalloc(size);
 220           sprintf (buf, "-T %s", s);
 221           parse_line (buf, 0);
 222           free (buf);
 223         }
 224       else
 225         parse_line (s, 1);
 226     }
 227
 228   if (link_info.relocateable && command_line.relax)
 229     {
 230       einfo ("%P%F: -relax and -r may not be used together\n");
 231     }
 232   lang_final ();
 233
 234   if (lang_has_input_file == false)
 235     {
 236       if (version_printed)
 237         xexit (0);
 238       einfo ("%P%F: no input files\n");
 239     }
 240
 241   if (trace_files)
 242     {
 243       info_msg ("%P: mode %s\n", emulation);
 244     }
 245
 246   ldemul_after_parse ();
 247
 248
 249   if (config.map_filename)
 250     {
 251       if (strcmp (config.map_filename, "-") == 0)
 252         {
 253           config.map_file = stdout;
 254         }
 255       else
 256         {
 257           config.map_file = fopen (config.map_filename, FOPEN_WT);
 258           if (config.map_file == (FILE *) NULL)
 259             {
 260               einfo ("%P%F: cannot open map file %s: %E\n",
 261                      config.map_filename);
 262             }
 263         }
 264     }
 265
 266
 267   lang_process ();
 268
 269   /* Print error messages for any missing symbols, for any warning
 270      symbols, and possibly multiple definitions */
 271
 272
 273   if (config.text_read_only)
 274     {
 275       /* Look for a text section and mark the readonly attribute in it */
 276       asection *found = bfd_get_section_by_name (output_bfd, ".text");
 277
 278       if (found != (asection *) NULL)
 279         {
 280           found->flags |= SEC_READONLY;
 281         }
 282     }
 283
 284   if (link_info.relocateable)
 285     output_bfd->flags &= ~EXEC_P;
 286   else
 287     output_bfd->flags |= EXEC_P;
 288
 289   ldwrite ();
 290
 291   /* Even if we're producing relocateable output, some non-fatal errors should
 292      be reported in the exit status.  (What non-fatal errors, if any, do we
 293      want to ignore for relocateable output?)  */
 294
 295   if (config.make_executable == false && force_make_executable == false)
 296     {
 297       if (trace_files == true)
 298         {
 299           einfo ("%P: link errors found, deleting executable `%s'\n",
 300                  output_filename);
 301         }
 302
 303       if (output_bfd->iostream)
 304         fclose ((FILE *) (output_bfd->iostream));
 305
 306       unlink (output_filename);
 307       xexit (1);
 308     }
 309   else
 310     {
 311       bfd_close (output_bfd);
 312     }
 313
 314   if (config.stats)
 315     {
 316       extern char **environ;
 317       char *lim = (char *) sbrk (0);
 318       long run_time = get_run_time () - start_time;
 319
 320       fprintf (stderr, "%s: total time in link: %d.%06d\n",
 321                program_name, run_time / 1000000, run_time % 1000000);
 322       fprintf (stderr, "%s: data size %ld\n", program_name,
 323                (long) (lim - (char *) &environ));
 324     }
 325
 326   atexit (preserve_output);
 327   xexit (0);
 328   return 0;
 329 }
 330
 331 /* We need to find any explicitly given emulation in order to initialize the
 332    state that's needed by the lex&yacc argument parser (parse_args).  */
 333
 334 static char *
 335 get_emulation (argc, argv)
 336      int argc;
 337      char **argv;
 338 {
 339   char *emulation;
 340   int i;
 341
 342   emulation = (char *) getenv (EMULATION_ENVIRON);
 343   if (emulation == NULL)
 344     emulation = DEFAULT_EMULATION;
 345
 346   for (i = 1; i < argc; i++)
 347     {
 348       if (!strncmp (argv[i], "-m", 2))
 349         {
 350           if (argv[i][2] == '\0')
 351             {
 352               /* -m EMUL */
 353               if (i < argc - 1)
 354                 {
 355                   emulation = argv[i + 1];
 356                   i++;
 357                 }
 358               else
 359                 {
 360                   einfo("%P%F: missing argument to -m\n");
 361                 }
 362             }
 363           else if (strcmp (argv[i], "-mips1") == 0
 364                    || strcmp (argv[i], "-mips2") == 0
 365                    || strcmp (argv[i], "-mips3") == 0)
 366             {
 367               /* FIXME: The arguments -mips1, -mips2 and -mips3 are
 368                  passed to the linker by some MIPS compilers.  They
 369                  generally tell the linker to use a slightly different
 370                  library path.  Perhaps someday these should be
 371                  implemented as emulations; until then, we just ignore
 372                  the arguments and hope that nobody ever creates
 373                  emulations named ips1, ips2 or ips3.  */
 374             }
 375           else
 376             {
 377               /* -mEMUL */
 378               emulation = &argv[i][2];
 379             }
 380         }
 381     }
 382
 383   return emulation;
 384 }
 385
 386 /* If directory DIR contains an "ldscripts" subdirectory,
 387    add DIR to the library search path and return true,
 388    else return false.  */
 389
 390 static boolean
 391 check_for_scripts_dir (dir)
 392      char *dir;
 393 {
 394   size_t dirlen;
 395   char *buf;
 396   struct stat s;
 397   boolean res;
 398
 399   dirlen = strlen (dir);
 400   /* sizeof counts the terminating NUL.  */
 401   buf = (char *) xmalloc (dirlen + sizeof("/ldscripts"));
 402   sprintf (buf, "%s/ldscripts", dir);
 403
 404   res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
 405   free (buf);
 406   if (res)
 407     ldfile_add_library_path (dir);
 408   return res;
 409 }
 410
 411 /* Set the default directory for finding script files.
 412    Libraries will be searched for here too, but that's ok.
 413    We look for the "ldscripts" directory in:
 414
 415    SCRIPTDIR (passed from Makefile)
 416    the dir where this program is (for using it from the build tree)
 417    the dir where this program is/../lib (for installing the tool suite elsewhere) */
 418
 419 static void
 420 set_scripts_dir ()
 421 {
 422   char *end, *dir;
 423   size_t dirlen;
 424
 425   if (check_for_scripts_dir (SCRIPTDIR))
 426     return;                     /* We've been installed normally.  */
 427
 428   /* Look for "ldscripts" in the dir where our binary is.  */
 429   end = strrchr (program_name, '/');
 430   if (end)
 431     {
 432       dirlen = end - program_name;
 433       /* Make a copy of program_name in dir.
 434          Leave room for later "/../lib".  */
 435       dir = (char *) xmalloc (dirlen + 8);
 436       strncpy (dir, program_name, dirlen);
 437       dir[dirlen] = '\0';
 438     }
 439   else
 440     {
 441       dirlen = 1;
 442       dir = (char *) xmalloc (dirlen + 8);
 443       strcpy (dir, ".");
 444     }
 445
 446   if (check_for_scripts_dir (dir))
 447     return;                     /* Don't free dir.  */
 448
 449   /* Look for "ldscripts" in <the dir where our binary is>/../lib.  */
 450   strcpy (dir + dirlen, "/../lib");
 451   if (check_for_scripts_dir (dir))
 452     return;
 453
 454   free (dir);                   /* Well, we tried.  */
 455 }
 456
 457 void
 458 add_ysym (name)
 459      const char *name;
 460 {
 461   if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
 462     {
 463       link_info.notice_hash = ((struct bfd_hash_table *)
 464                                xmalloc (sizeof (struct bfd_hash_table)));
 465       if (! bfd_hash_table_init_n (link_info.notice_hash,
 466                                    bfd_hash_newfunc,
 467                                    61))
 468         einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 469     }
 470
 471   if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
 472       == (struct bfd_hash_entry *) NULL)
 473     einfo ("%P%F: bfd_hash_lookup failed: %E\n");
 474 }
 475
 476 /* Handle the -retain-symbols-file option.  */
 477
 478 void
 479 add_keepsyms_file (filename)
 480      const char *filename;
 481 {
 482   FILE *file;
 483   char *buf;
 484   size_t bufsize;
 485   int c;
 486
 487   if (link_info.strip == strip_some)
 488     einfo ("%X%P: error: duplicate retain-symbols-file\n");
 489
 490   file = fopen (filename, "r");
 491   if (file == (FILE *) NULL)
 492     {
 493       bfd_error = system_call_error;
 494       einfo ("%X%P: %s: %E", filename);
 495       return;
 496     }
 497
 498   link_info.keep_hash = ((struct bfd_hash_table *)
 499                          xmalloc (sizeof (struct bfd_hash_table)));
 500   if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
 501     einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 502
 503   bufsize = 100;
 504   buf = (char *) xmalloc (bufsize);
 505
 506   c = getc (file);
 507   while (c != EOF)
 508     {
 509       while (isspace (c))
 510         c = getc (file);
 511
 512       if (c != EOF)
 513         {
 514           size_t len = 0;
 515
 516           while (! isspace (c) && c != EOF)
 517             {
 518               buf[len] = c;
 519               ++len;
 520               if (len >= bufsize)
 521                 {
 522                   bufsize *= 2;
 523                   buf = xrealloc (buf, bufsize);
 524                 }
 525               c = getc (file);
 526             }
 527
 528           buf[len] = '\0';
 529
 530           if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
 531               == (struct bfd_hash_entry *) NULL)
 532             einfo ("%P%F: bfd_hash_lookup for insertion failed: %E");
 533         }
 534     }
 535
 536   if (link_info.strip != strip_none)
 537     einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
 538
 539   link_info.strip = strip_some;
 540 }
 541 \f
 542 /* Callbacks from the BFD linker routines.  */
 543
 544 /* This is called when BFD has decided to include an archive member in
 545    a link.  */
 546
 547 /*ARGSUSED*/
 548 static boolean
 549 add_archive_element (info, abfd, name)
 550      struct bfd_link_info *info;
 551      bfd *abfd;
 552      const char *name;
 553 {
 554   lang_input_statement_type *input;
 555
 556   input = ((lang_input_statement_type *)
 557            xmalloc ((bfd_size_type) sizeof (lang_input_statement_type)));
 558   input->filename = abfd->filename;
 559   input->local_sym_name = abfd->filename;
 560   input->the_bfd = abfd;
 561   input->asymbols = NULL;
 562   input->subfiles = NULL;
 563   input->next = NULL;
 564   input->just_syms_flag = false;
 565   input->loaded = false;
 566   input->chain = NULL;
 567
 568   /* FIXME: This is wrong.  It should point to an entry for the
 569      archive itself.  However, it doesn't seem to matter.  */
 570   input->superfile = NULL;
 571
 572   /* FIXME: The following fields are not set: header.next,
 573      header.type, closed, passive_position, symbol_count, total_size,
 574      next_real_file, is_archive, search_dirs_flag, target, real,
 575      common_section, common_output_section, complained.  This bit of
 576      code is from the old decode_library_subfile function.  I don't
 577      know whether any of those fields matters.  */
 578
 579   ldlang_add_file (input);
 580
 581   if (write_map)
 582     info_msg ("%s needed due to %T\n", abfd->filename, name);
 583
 584   if (trace_files || trace_file_tries)
 585     info_msg ("%I\n", input);
 586
 587   return true;
 588 }
 589
 590 /* This is called when BFD has discovered a symbol which is defined
 591    multiple times.  */
 592
 593 /*ARGSUSED*/
 594 static boolean
 595 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
 596      struct bfd_link_info *info;
 597      const char *name;
 598      bfd *obfd;
 599      asection *osec;
 600      bfd_vma oval;
 601      bfd *nbfd;
 602      asection *nsec;
 603      bfd_vma nval;
 604 {
 605   einfo ("%X%C: multiple definition of `%T'\n",
 606          nbfd, nsec, nval, name);
 607   if (obfd != (bfd *) NULL)
 608     einfo ("%C: first defined here\n", obfd, osec, oval);
 609   return true;
 610 }
 611
 612 /* This is called when there is a definition of a common symbol, or
 613    when a common symbol is found for a symbol that is already defined,
 614    or when two common symbols are found.  We only do something if
 615    -warn-common was used.  */
 616
 617 /*ARGSUSED*/
 618 static boolean
 619 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
 620      struct bfd_link_info *info;
 621      const char *name;
 622      bfd *obfd;
 623      enum bfd_link_hash_type otype;
 624      bfd_vma osize;
 625      bfd *nbfd;
 626      enum bfd_link_hash_type ntype;
 627      bfd_vma nsize;
 628 {
 629   if (! config.warn_common)
 630     return true;
 631
 632   if (ntype == bfd_link_hash_defined)
 633     {
 634       ASSERT (otype == bfd_link_hash_common);
 635       einfo ("%B: warning: definition of `%T' overriding common\n",
 636              nbfd, name);
 637       einfo ("%B: warning: common is here\n", obfd);
 638     }
 639   else if (otype == bfd_link_hash_defined)
 640     {
 641       ASSERT (ntype == bfd_link_hash_common);
 642       einfo ("%B: warning: common of `%T' overridden by definition\n",
 643              nbfd, name);
 644       einfo ("%B: warning: defined here\n", obfd);
 645     }
 646   else
 647     {
 648       ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
 649       if (osize > nsize)
 650         {
 651           einfo ("%B: warning: common of `%T' overridden by larger common\n",
 652                  nbfd, name);
 653           einfo ("%B: warning: larger common is here\n", obfd);
 654         }
 655       else if (nsize > osize)
 656         {
 657           einfo ("%B: warning: common of `%T' overriding smaller common\n",
 658                  nbfd, name);
 659           einfo ("%B: warning: smaller common is here\n", obfd);
 660         }
 661       else
 662         {
 663           einfo ("%B: warning: multiple common of `%T'\n", nbfd, name);
 664           einfo ("%B: warning: previous common is here\n", obfd);
 665         }
 666     }
 667
 668   return true;
 669 }
 670
 671 /* This is called when BFD has discovered a set element.  H is the
 672    entry in the linker hash table for the set.  SECTION and VALUE
 673    represent a value which should be added to the set.  */
 674
 675 /*ARGSUSED*/
 676 static boolean
 677 add_to_set (info, h, bitsize, abfd, section, value)
 678      struct bfd_link_info *info;
 679      struct bfd_link_hash_entry *h;
 680      unsigned int bitsize;
 681      bfd *abfd;
 682      asection *section;
 683      bfd_vma value;
 684 {
 685   ldctor_add_set_entry (h, bitsize, section, value);
 686   return true;
 687 }
 688
 689 /* This is called when BFD has discovered a constructor.  This is only
 690    called for some object file formats--those which do not handle
 691    constructors in some more clever fashion.  This is similar to
 692    adding an element to a set, but less general.  */
 693
 694 static boolean
 695 constructor_callback (info, constructor, bitsize, name, abfd, section, value)
 696      struct bfd_link_info *info;
 697      boolean constructor;
 698      unsigned int bitsize;
 699      const char *name;
 700      bfd *abfd;
 701      asection *section;
 702      bfd_vma value;
 703 {
 704   char *set_name;
 705   char *s;
 706   struct bfd_link_hash_entry *h;
 707
 708   if (! config.build_constructors)
 709     return true;
 710
 711   set_name = (char *) alloca (1 + sizeof "__CTOR_LIST__");
 712   s = set_name;
 713   if (bfd_get_symbol_leading_char (abfd) != '\0')
 714     *s++ = bfd_get_symbol_leading_char (abfd);
 715   if (constructor)
 716     strcpy (s, "__CTOR_LIST__");
 717   else
 718     strcpy (s, "__DTOR_LIST__");
 719
 720   if (write_map)
 721     info_msg ("Adding %s to constructor/destructor set %s\n", name, set_name);
 722
 723   h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
 724   if (h == (struct bfd_link_hash_entry *) NULL)
 725     einfo ("%P%F: bfd_link_hash_lookup failed: %E");
 726   if (h->type == bfd_link_hash_new)
 727     {
 728       h->type = bfd_link_hash_undefined;
 729       h->u.undef.abfd = abfd;
 730       /* We don't call bfd_link_add_undef to add this to the list of
 731          undefined symbols because we are going to define it
 732          ourselves.  */
 733     }
 734
 735   ldctor_add_set_entry (h, bitsize, section, value);
 736   return true;
 737 }
 738
 739 /* This is called when there is a reference to a warning symbol.  */
 740
 741 /*ARGSUSED*/
 742 static boolean
 743 warning_callback (info, warning)
 744      struct bfd_link_info *info;
 745      const char *warning;
 746 {
 747   einfo ("%P: %s\n", warning);
 748   return true;
 749 }
 750
 751 /* This is called when an undefined symbol is found.  */
 752
 753 /*ARGSUSED*/
 754 static boolean
 755 undefined_symbol (info, name, abfd, section, address)
 756      struct bfd_link_info *info;
 757      const char *name;
 758      bfd *abfd;
 759      asection *section;
 760      bfd_vma address;
 761 {
 762   static char *error_name;
 763   static unsigned int error_count;
 764
 765 #define MAX_ERRORS_IN_A_ROW 5
 766
 767   /* We never print more than a reasonable number of errors in a row
 768      for a single symbol.  */
 769   if (error_name != (char *) NULL
 770       && strcmp (name, error_name) == 0)
 771     ++error_count;
 772   else
 773     {
 774       error_count = 0;
 775       if (error_name != (char *) NULL)
 776         free (error_name);
 777       error_name = buystring (name);
 778     }
 779
 780   if (error_count < MAX_ERRORS_IN_A_ROW)
 781     einfo ("%X%C: undefined reference to `%T'\n",
 782            abfd, section, address, name);
 783   else if (error_count == MAX_ERRORS_IN_A_ROW)
 784     einfo ("%C: more undefined references to `%T' follow\n",
 785            abfd, section, address, name);
 786
 787   return true;
 788 }
 789
 790 /* This is called when a reloc overflows.  */
 791
 792 /*ARGSUSED*/
 793 static boolean
 794 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
 795      struct bfd_link_info *info;
 796      const char *name;
 797      const char *reloc_name;
 798      bfd_vma addend;
 799      bfd *abfd;
 800      asection *section;
 801      bfd_vma address;
 802 {
 803   einfo ("%X%C: relocation truncated to fit: %s %T", abfd, section,
 804          address, reloc_name, name);
 805   if (addend != 0)
 806     einfo ("+%v", addend);
 807   einfo ("\n");
 808   return true;
 809 }
 810
 811 /* This is called when a dangerous relocation is made.  */
 812
 813 /*ARGSUSED*/
 814 static boolean
 815 reloc_dangerous (info, message, abfd, section, address)
 816      struct bfd_link_info *info;
 817      const char *message;
 818      bfd *abfd;
 819      asection *section;
 820      bfd_vma address;
 821 {
 822   einfo ("%X%C: dangerous relocation: %s\n", abfd, section, address, message);
 823   return true;
 824 }
 825
 826 /* This is called when a reloc is being generated attached to a symbol
 827    that is not being output.  */
 828
 829 /*ARGSUSED*/
 830 static boolean
 831 unattached_reloc (info, name, abfd, section, address)
 832      struct bfd_link_info *info;
 833      const char *name;
 834      bfd *abfd;
 835      asection *section;
 836      bfd_vma address;
 837 {
 838   einfo ("%X%C: reloc refers to symbol `%T' which is not being output\n",
 839          abfd, section, address, name);
 840   return true;
 841 }
 842
 843 /* This is called when a symbol in notice_hash is found.  Symbols are
 844    put in notice_hash using the -y option.  */
 845
 846 /*ARGSUSED*/
 847 static boolean
 848 notice_ysym (info, name, abfd, section, value)
 849      struct bfd_link_info *info;
 850      const char *name;
 851      bfd *abfd;
 852      asection *section;
 853      bfd_vma value;
 854 {
 855   einfo ("%B: %s %s\n", abfd,
 856          section != &bfd_und_section ? "definition of" : "reference to",
 857          name);
 858   return true;
 859 }