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 args_type command_line;
  76
  77 ld_config_type config;
  78
  79 static boolean check_for_scripts_dir PARAMS ((char *dir));
  80 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
  81                                             const char *));
  82 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
  83                                             const char *,
  84                                             bfd *, asection *, bfd_vma,
  85                                             bfd *, asection *, bfd_vma));
  86 static boolean multiple_common PARAMS ((struct bfd_link_info *,
  87                                         const char *, bfd *,
  88                                         enum bfd_link_hash_type, bfd_vma,
  89                                         bfd *, enum bfd_link_hash_type,
  90                                         bfd_vma));
  91 static boolean add_to_set PARAMS ((struct bfd_link_info *,
  92                                    struct bfd_link_hash_entry *,
  93                                    bfd_reloc_code_real_type,
  94                                    bfd *, asection *, bfd_vma));
  95 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
  96                                              boolean constructor,
  97                                              const char *name,
  98                                              bfd *, asection *, bfd_vma));
  99 static boolean warning_callback PARAMS ((struct bfd_link_info *,
 100                                          const char *));
 101 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
 102                                          const char *, bfd *,
 103                                          asection *, bfd_vma));
 104 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
 105                                        const char *, bfd_vma,
 106                                        bfd *, asection *, bfd_vma));
 107 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
 108                                         bfd *, asection *, bfd_vma));
 109 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
 110                                          const char *, bfd *, asection *,
 111                                          bfd_vma));
 112 static boolean notice_ysym PARAMS ((struct bfd_link_info *, const char *,
 113                                     bfd *, asection *, bfd_vma));
 114
 115 static struct bfd_link_callbacks link_callbacks =
 116 {
 117   add_archive_element,
 118   multiple_definition,
 119   multiple_common,
 120   add_to_set,
 121   constructor_callback,
 122   warning_callback,
 123   undefined_symbol,
 124   reloc_overflow,
 125   reloc_dangerous,
 126   unattached_reloc,
 127   notice_ysym
 128 };
 129
 130 struct bfd_link_info link_info;
 131 \f
 132 static void
 133 remove_output ()
 134 {
 135   if (output_filename)
 136     {
 137       if (output_bfd && output_bfd->iostream)
 138         fclose((FILE *)(output_bfd->iostream));
 139       if (delete_output_file_on_failure)
 140         unlink (output_filename);
 141     }
 142 }
 143
 144 int
 145 main (argc, argv)
 146      int argc;
 147      char **argv;
 148 {
 149   char *emulation;
 150   long start_time = get_run_time ();
 151
 152   program_name = argv[0];
 153   xmalloc_set_program_name (program_name);
 154
 155   bfd_init ();
 156
 157   xatexit (remove_output);
 158
 159   /* Initialize the data about options.  */
 160   trace_files = trace_file_tries = version_printed = false;
 161   config.traditional_format = false;
 162   config.build_constructors = true;
 163   config.dynamic_link = false;
 164   command_line.force_common_definition = false;
 165   command_line.interpreter = NULL;
 166
 167   link_info.callbacks = &link_callbacks;
 168   link_info.relocateable = false;
 169   link_info.shared = false;
 170   link_info.strip = strip_none;
 171   link_info.discard = discard_none;
 172   link_info.lprefix_len = 1;
 173   link_info.lprefix = "L";
 174   link_info.keep_memory = true;
 175   link_info.input_bfds = NULL;
 176   link_info.create_object_symbols_section = NULL;
 177   link_info.hash = NULL;
 178   link_info.keep_hash = NULL;
 179   link_info.notice_hash = NULL;
 180
 181   ldfile_add_arch ("");
 182
 183   config.make_executable = true;
 184   force_make_executable = false;
 185   config.magic_demand_paged = true;
 186   config.text_read_only = true;
 187   config.make_executable = true;
 188
 189   emulation = get_emulation (argc, argv);
 190   ldemul_choose_mode (emulation);
 191   default_target = ldemul_choose_target ();
 192   lang_init ();
 193   ldemul_before_parse ();
 194   lang_has_input_file = false;
 195   parse_args (argc, argv);
 196
 197   if (link_info.relocateable)
 198     {
 199       if (command_line.relax)
 200         einfo ("%P%F: -relax and -r may not be used together\n");
 201       if (config.dynamic_link)
 202         einfo ("%P%F: -r and -call_shared may not be used together\n");
 203       if (link_info.strip == strip_all)
 204         einfo ("%P%F: -r and -s may not be used together\n");
 205       if (link_info.shared)
 206         einfo ("%P%F: -r and -shared may not be used together\n");
 207     }
 208
 209   /* This essentially adds another -L directory so this must be done after
 210      the -L's in argv have been processed.  */
 211   set_scripts_dir ();
 212
 213   if (had_script == false)
 214     {
 215       /* Read the emulation's appropriate default script.  */
 216       int isfile;
 217       char *s = ldemul_get_script (&isfile);
 218
 219       if (isfile)
 220         ldfile_open_command_file (s);
 221       else
 222         lex_redirect (s);
 223       parser_input = input_script;
 224       yyparse ();
 225     }
 226
 227   lang_final ();
 228
 229   if (lang_has_input_file == false)
 230     {
 231       if (version_printed)
 232         xexit (0);
 233       einfo ("%P%F: no input files\n");
 234     }
 235
 236   if (trace_files)
 237     {
 238       info_msg ("%P: mode %s\n", emulation);
 239     }
 240
 241   ldemul_after_parse ();
 242
 243
 244   if (config.map_filename)
 245     {
 246       if (strcmp (config.map_filename, "-") == 0)
 247         {
 248           config.map_file = stdout;
 249         }
 250       else
 251         {
 252           config.map_file = fopen (config.map_filename, FOPEN_WT);
 253           if (config.map_file == (FILE *) NULL)
 254             {
 255               einfo ("%P%F: cannot open map file %s: %E\n",
 256                      config.map_filename);
 257             }
 258         }
 259     }
 260
 261
 262   lang_process ();
 263
 264   /* Print error messages for any missing symbols, for any warning
 265      symbols, and possibly multiple definitions */
 266
 267
 268   if (config.text_read_only)
 269     {
 270       /* Look for a text section and mark the readonly attribute in it */
 271       asection *found = bfd_get_section_by_name (output_bfd, ".text");
 272
 273       if (found != (asection *) NULL)
 274         {
 275           found->flags |= SEC_READONLY;
 276         }
 277     }
 278
 279   if (link_info.relocateable)
 280     output_bfd->flags &= ~EXEC_P;
 281   else
 282     output_bfd->flags |= EXEC_P;
 283
 284   ldwrite ();
 285
 286   /* Even if we're producing relocateable output, some non-fatal errors should
 287      be reported in the exit status.  (What non-fatal errors, if any, do we
 288      want to ignore for relocateable output?)  */
 289
 290   if (config.make_executable == false && force_make_executable == false)
 291     {
 292       if (trace_files == true)
 293         {
 294           einfo ("%P: link errors found, deleting executable `%s'\n",
 295                  output_filename);
 296         }
 297
 298       if (output_bfd->iostream)
 299         fclose ((FILE *) (output_bfd->iostream));
 300
 301       unlink (output_filename);
 302       xexit (1);
 303     }
 304   else
 305     {
 306       if (! bfd_close (output_bfd))
 307         einfo ("%F%B: final close failed: %E\n", output_bfd);
 308     }
 309
 310   if (config.stats)
 311     {
 312       extern char **environ;
 313       char *lim = (char *) sbrk (0);
 314       long run_time = get_run_time () - start_time;
 315
 316       fprintf (stderr, "%s: total time in link: %ld.%06ld\n",
 317                program_name, run_time / 1000000, run_time % 1000000);
 318       fprintf (stderr, "%s: data size %ld\n", program_name,
 319                (long) (lim - (char *) &environ));
 320     }
 321
 322   /* Prevent remove_output from doing anything, after a successful link.  */
 323   output_filename = NULL;
 324
 325   xexit (0);
 326   return 0;
 327 }
 328
 329 /* We need to find any explicitly given emulation in order to initialize the
 330    state that's needed by the lex&yacc argument parser (parse_args).  */
 331
 332 static char *
 333 get_emulation (argc, argv)
 334      int argc;
 335      char **argv;
 336 {
 337   char *emulation;
 338   int i;
 339
 340   emulation = (char *) getenv (EMULATION_ENVIRON);
 341   if (emulation == NULL)
 342     emulation = DEFAULT_EMULATION;
 343
 344   for (i = 1; i < argc; i++)
 345     {
 346       if (!strncmp (argv[i], "-m", 2))
 347         {
 348           if (argv[i][2] == '\0')
 349             {
 350               /* -m EMUL */
 351               if (i < argc - 1)
 352                 {
 353                   emulation = argv[i + 1];
 354                   i++;
 355                 }
 356               else
 357                 {
 358                   einfo("%P%F: missing argument to -m\n");
 359                 }
 360             }
 361           else if (strcmp (argv[i], "-mips1") == 0
 362                    || strcmp (argv[i], "-mips2") == 0
 363                    || strcmp (argv[i], "-mips3") == 0)
 364             {
 365               /* FIXME: The arguments -mips1, -mips2 and -mips3 are
 366                  passed to the linker by some MIPS compilers.  They
 367                  generally tell the linker to use a slightly different
 368                  library path.  Perhaps someday these should be
 369                  implemented as emulations; until then, we just ignore
 370                  the arguments and hope that nobody ever creates
 371                  emulations named ips1, ips2 or ips3.  */
 372             }
 373           else if (strcmp (argv[i], "-m486") == 0)
 374             {
 375               /* FIXME: The argument -m486 is passed to the linker on
 376                  some Linux systems.  Hope that nobody creates an
 377                  emulation named 486.  */
 378             }
 379           else
 380             {
 381               /* -mEMUL */
 382               emulation = &argv[i][2];
 383             }
 384         }
 385     }
 386
 387   return emulation;
 388 }
 389
 390 /* If directory DIR contains an "ldscripts" subdirectory,
 391    add DIR to the library search path and return true,
 392    else return false.  */
 393
 394 static boolean
 395 check_for_scripts_dir (dir)
 396      char *dir;
 397 {
 398   size_t dirlen;
 399   char *buf;
 400   struct stat s;
 401   boolean res;
 402
 403   dirlen = strlen (dir);
 404   /* sizeof counts the terminating NUL.  */
 405   buf = (char *) xmalloc (dirlen + sizeof("/ldscripts"));
 406   sprintf (buf, "%s/ldscripts", dir);
 407
 408   res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
 409   free (buf);
 410   if (res)
 411     ldfile_add_library_path (dir, false);
 412   return res;
 413 }
 414
 415 /* Set the default directory for finding script files.
 416    Libraries will be searched for here too, but that's ok.
 417    We look for the "ldscripts" directory in:
 418
 419    SCRIPTDIR (passed from Makefile)
 420    the dir where this program is (for using it from the build tree)
 421    the dir where this program is/../lib (for installing the tool suite elsewhere) */
 422
 423 static void
 424 set_scripts_dir ()
 425 {
 426   char *end, *dir;
 427   size_t dirlen;
 428
 429   if (check_for_scripts_dir (SCRIPTDIR))
 430     return;                     /* We've been installed normally.  */
 431
 432   /* Look for "ldscripts" in the dir where our binary is.  */
 433   end = strrchr (program_name, '/');
 434   if (end)
 435     {
 436       dirlen = end - program_name;
 437       /* Make a copy of program_name in dir.
 438          Leave room for later "/../lib".  */
 439       dir = (char *) xmalloc (dirlen + 8);
 440       strncpy (dir, program_name, dirlen);
 441       dir[dirlen] = '\0';
 442     }
 443   else
 444     {
 445       dirlen = 1;
 446       dir = (char *) xmalloc (dirlen + 8);
 447       strcpy (dir, ".");
 448     }
 449
 450   if (check_for_scripts_dir (dir))
 451     return;                     /* Don't free dir.  */
 452
 453   /* Look for "ldscripts" in <the dir where our binary is>/../lib.  */
 454   strcpy (dir + dirlen, "/../lib");
 455   if (check_for_scripts_dir (dir))
 456     return;
 457
 458   free (dir);                   /* Well, we tried.  */
 459 }
 460
 461 void
 462 add_ysym (name)
 463      const char *name;
 464 {
 465   if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
 466     {
 467       link_info.notice_hash = ((struct bfd_hash_table *)
 468                                xmalloc (sizeof (struct bfd_hash_table)));
 469       if (! bfd_hash_table_init_n (link_info.notice_hash,
 470                                    bfd_hash_newfunc,
 471                                    61))
 472         einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 473     }
 474
 475   if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
 476       == (struct bfd_hash_entry *) NULL)
 477     einfo ("%P%F: bfd_hash_lookup failed: %E\n");
 478 }
 479
 480 /* Handle the -retain-symbols-file option.  */
 481
 482 void
 483 add_keepsyms_file (filename)
 484      const char *filename;
 485 {
 486   FILE *file;
 487   char *buf;
 488   size_t bufsize;
 489   int c;
 490
 491   if (link_info.strip == strip_some)
 492     einfo ("%X%P: error: duplicate retain-symbols-file\n");
 493
 494   file = fopen (filename, "r");
 495   if (file == (FILE *) NULL)
 496     {
 497       bfd_set_error (bfd_error_system_call);
 498       einfo ("%X%P: %s: %E", filename);
 499       return;
 500     }
 501
 502   link_info.keep_hash = ((struct bfd_hash_table *)
 503                          xmalloc (sizeof (struct bfd_hash_table)));
 504   if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
 505     einfo ("%P%F: bfd_hash_table_init failed: %E\n");
 506
 507   bufsize = 100;
 508   buf = (char *) xmalloc (bufsize);
 509
 510   c = getc (file);
 511   while (c != EOF)
 512     {
 513       while (isspace (c))
 514         c = getc (file);
 515
 516       if (c != EOF)
 517         {
 518           size_t len = 0;
 519
 520           while (! isspace (c) && c != EOF)
 521             {
 522               buf[len] = c;
 523               ++len;
 524               if (len >= bufsize)
 525                 {
 526                   bufsize *= 2;
 527                   buf = xrealloc (buf, bufsize);
 528                 }
 529               c = getc (file);
 530             }
 531
 532           buf[len] = '\0';
 533
 534           if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
 535               == (struct bfd_hash_entry *) NULL)
 536             einfo ("%P%F: bfd_hash_lookup for insertion failed: %E");
 537         }
 538     }
 539
 540   if (link_info.strip != strip_none)
 541     einfo ("%P: `-retain-symbols-file' overrides `-s' and `-S'\n");
 542
 543   link_info.strip = strip_some;
 544 }
 545 \f
 546 /* Callbacks from the BFD linker routines.  */
 547
 548 /* This is called when BFD has decided to include an archive member in
 549    a link.  */
 550
 551 /*ARGSUSED*/
 552 static boolean
 553 add_archive_element (info, abfd, name)
 554      struct bfd_link_info *info;
 555      bfd *abfd;
 556      const char *name;
 557 {
 558   lang_input_statement_type *input;
 559
 560   input = ((lang_input_statement_type *)
 561            xmalloc ((bfd_size_type) sizeof (lang_input_statement_type)));
 562   input->filename = abfd->filename;
 563   input->local_sym_name = abfd->filename;
 564   input->the_bfd = abfd;
 565   input->asymbols = NULL;
 566   input->next = NULL;
 567   input->just_syms_flag = false;
 568   input->loaded = false;
 569   input->search_dirs_flag = false;
 570
 571   /* FIXME: The following fields are not set: header.next,
 572      header.type, closed, passive_position, symbol_count,
 573      next_real_file, is_archive, target, real, common_section,
 574      common_output_section, complained.  This bit of code is from the
 575      old decode_library_subfile function.  I don't know whether any of
 576      those fields matters.  */
 577
 578   ldlang_add_file (input);
 579
 580   if (config.map_file != (FILE *) NULL)
 581     minfo ("%s needed due to %T\n", abfd->filename, name);
 582
 583   if (trace_files || trace_file_tries)
 584     info_msg ("%I\n", input);
 585
 586   return true;
 587 }
 588
 589 /* This is called when BFD has discovered a symbol which is defined
 590    multiple times.  */
 591
 592 /*ARGSUSED*/
 593 static boolean
 594 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
 595      struct bfd_link_info *info;
 596      const char *name;
 597      bfd *obfd;
 598      asection *osec;
 599      bfd_vma oval;
 600      bfd *nbfd;
 601      asection *nsec;
 602      bfd_vma nval;
 603 {
 604   einfo ("%X%C: multiple definition of `%T'\n",
 605          nbfd, nsec, nval, name);
 606   if (obfd != (bfd *) NULL)
 607     einfo ("%C: first defined here\n", obfd, osec, oval);
 608   return true;
 609 }
 610
 611 /* This is called when there is a definition of a common symbol, or
 612    when a common symbol is found for a symbol that is already defined,
 613    or when two common symbols are found.  We only do something if
 614    -warn-common was used.  */
 615
 616 /*ARGSUSED*/
 617 static boolean
 618 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
 619      struct bfd_link_info *info;
 620      const char *name;
 621      bfd *obfd;
 622      enum bfd_link_hash_type otype;
 623      bfd_vma osize;
 624      bfd *nbfd;
 625      enum bfd_link_hash_type ntype;
 626      bfd_vma nsize;
 627 {
 628   if (! config.warn_common)
 629     return true;
 630
 631   if (ntype == bfd_link_hash_defined)
 632     {
 633       ASSERT (otype == bfd_link_hash_common);
 634       einfo ("%B: warning: definition of `%T' overriding common\n",
 635              nbfd, name);
 636       einfo ("%B: warning: common is here\n", obfd);
 637     }
 638   else if (otype == bfd_link_hash_defined)
 639     {
 640       ASSERT (ntype == bfd_link_hash_common);
 641       einfo ("%B: warning: common of `%T' overridden by definition\n",
 642              nbfd, name);
 643       einfo ("%B: warning: defined here\n", obfd);
 644     }
 645   else
 646     {
 647       ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
 648       if (osize > nsize)
 649         {
 650           einfo ("%B: warning: common of `%T' overridden by larger common\n",
 651                  nbfd, name);
 652           einfo ("%B: warning: larger common is here\n", obfd);
 653         }
 654       else if (nsize > osize)
 655         {
 656           einfo ("%B: warning: common of `%T' overriding smaller common\n",
 657                  nbfd, name);
 658           einfo ("%B: warning: smaller common is here\n", obfd);
 659         }
 660       else
 661         {
 662           einfo ("%B: warning: multiple common of `%T'\n", nbfd, name);
 663           einfo ("%B: warning: previous common is here\n", obfd);
 664         }
 665     }
 666
 667   return true;
 668 }
 669
 670 /* This is called when BFD has discovered a set element.  H is the
 671    entry in the linker hash table for the set.  SECTION and VALUE
 672    represent a value which should be added to the set.  */
 673
 674 /*ARGSUSED*/
 675 static boolean
 676 add_to_set (info, h, reloc, abfd, section, value)
 677      struct bfd_link_info *info;
 678      struct bfd_link_hash_entry *h;
 679      bfd_reloc_code_real_type reloc;
 680      bfd *abfd;
 681      asection *section;
 682      bfd_vma value;
 683 {
 684   if (! config.build_constructors)
 685     return true;
 686
 687   ldctor_add_set_entry (h, reloc, section, value);
 688
 689   if (h->type == bfd_link_hash_new)
 690     {
 691       h->type = bfd_link_hash_undefined;
 692       h->u.undef.abfd = abfd;
 693       /* We don't call bfd_link_add_undef to add this to the list of
 694          undefined symbols because we are going to define it
 695          ourselves.  */
 696     }
 697
 698   return true;
 699 }
 700
 701 /* This is called when BFD has discovered a constructor.  This is only
 702    called for some object file formats--those which do not handle
 703    constructors in some more clever fashion.  This is similar to
 704    adding an element to a set, but less general.  */
 705
 706 static boolean
 707 constructor_callback (info, constructor, name, abfd, section, value)
 708      struct bfd_link_info *info;
 709      boolean constructor;
 710      const char *name;
 711      bfd *abfd;
 712      asection *section;
 713      bfd_vma value;
 714 {
 715   char *set_name;
 716   char *s;
 717   struct bfd_link_hash_entry *h;
 718
 719   if (! config.build_constructors)
 720     return true;
 721
 722   /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
 723      useful error message.  */
 724   if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL)
 725     einfo ("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported");
 726
 727   set_name = (char *) alloca (1 + sizeof "__CTOR_LIST__");
 728   s = set_name;
 729   if (bfd_get_symbol_leading_char (abfd) != '\0')
 730     *s++ = bfd_get_symbol_leading_char (abfd);
 731   if (constructor)
 732     strcpy (s, "__CTOR_LIST__");
 733   else
 734     strcpy (s, "__DTOR_LIST__");
 735
 736   if (config.map_file != (FILE *) NULL)
 737     fprintf (config.map_file,
 738              "Adding %s to constructor/destructor set %s\n", name, set_name);
 739
 740   h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
 741   if (h == (struct bfd_link_hash_entry *) NULL)
 742     einfo ("%P%F: bfd_link_hash_lookup failed: %E");
 743   if (h->type == bfd_link_hash_new)
 744     {
 745       h->type = bfd_link_hash_undefined;
 746       h->u.undef.abfd = abfd;
 747       /* We don't call bfd_link_add_undef to add this to the list of
 748          undefined symbols because we are going to define it
 749          ourselves.  */
 750     }
 751
 752   ldctor_add_set_entry (h, BFD_RELOC_CTOR, section, value);
 753   return true;
 754 }
 755
 756 /* This is called when there is a reference to a warning symbol.  */
 757
 758 /*ARGSUSED*/
 759 static boolean
 760 warning_callback (info, warning)
 761      struct bfd_link_info *info;
 762      const char *warning;
 763 {
 764   einfo ("%P: %s\n", warning);
 765   return true;
 766 }
 767
 768 /* This is called when an undefined symbol is found.  */
 769
 770 /*ARGSUSED*/
 771 static boolean
 772 undefined_symbol (info, name, abfd, section, address)
 773      struct bfd_link_info *info;
 774      const char *name;
 775      bfd *abfd;
 776      asection *section;
 777      bfd_vma address;
 778 {
 779   static char *error_name;
 780   static unsigned int error_count;
 781
 782 #define MAX_ERRORS_IN_A_ROW 5
 783
 784   /* We never print more than a reasonable number of errors in a row
 785      for a single symbol.  */
 786   if (error_name != (char *) NULL
 787       && strcmp (name, error_name) == 0)
 788     ++error_count;
 789   else
 790     {
 791       error_count = 0;
 792       if (error_name != (char *) NULL)
 793         free (error_name);
 794       error_name = buystring (name);
 795     }
 796
 797   if (error_count < MAX_ERRORS_IN_A_ROW)
 798     einfo ("%X%C: undefined reference to `%T'\n",
 799            abfd, section, address, name);
 800   else if (error_count == MAX_ERRORS_IN_A_ROW)
 801     einfo ("%C: more undefined references to `%T' follow\n",
 802            abfd, section, address, name);
 803
 804   return true;
 805 }
 806
 807 /* This is called when a reloc overflows.  */
 808
 809 /*ARGSUSED*/
 810 static boolean
 811 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
 812      struct bfd_link_info *info;
 813      const char *name;
 814      const char *reloc_name;
 815      bfd_vma addend;
 816      bfd *abfd;
 817      asection *section;
 818      bfd_vma address;
 819 {
 820   if (abfd == (bfd *) NULL)
 821     einfo ("%P%X: generated");
 822   else
 823     einfo ("%X%C:", abfd, section, address);
 824   einfo (" relocation truncated to fit: %s %T", reloc_name, name);
 825   if (addend != 0)
 826     einfo ("+%v", addend);
 827   einfo ("\n");
 828   return true;
 829 }
 830
 831 /* This is called when a dangerous relocation is made.  */
 832
 833 /*ARGSUSED*/
 834 static boolean
 835 reloc_dangerous (info, message, abfd, section, address)
 836      struct bfd_link_info *info;
 837      const char *message;
 838      bfd *abfd;
 839      asection *section;
 840      bfd_vma address;
 841 {
 842   if (abfd == (bfd *) NULL)
 843     einfo ("%P%X: generated");
 844   else
 845     einfo ("%X%C:", abfd, section, address);
 846   einfo ("dangerous relocation: %s\n", message);
 847   return true;
 848 }
 849
 850 /* This is called when a reloc is being generated attached to a symbol
 851    that is not being output.  */
 852
 853 /*ARGSUSED*/
 854 static boolean
 855 unattached_reloc (info, name, abfd, section, address)
 856      struct bfd_link_info *info;
 857      const char *name;
 858      bfd *abfd;
 859      asection *section;
 860      bfd_vma address;
 861 {
 862   if (abfd == (bfd *) NULL)
 863     einfo ("%P%X: generated");
 864   else
 865     einfo ("%X%C:", abfd, section, address);
 866   einfo (" reloc refers to symbol `%T' which is not being output\n", name);
 867   return true;
 868 }
 869
 870 /* This is called when a symbol in notice_hash is found.  Symbols are
 871    put in notice_hash using the -y option.  */
 872
 873 /*ARGSUSED*/
 874 static boolean
 875 notice_ysym (info, name, abfd, section, value)
 876      struct bfd_link_info *info;
 877      const char *name;
 878      bfd *abfd;
 879      asection *section;
 880      bfd_vma value;
 881 {
 882   einfo ("%B: %s %s\n", abfd,
 883          section != &bfd_und_section ? "definition of" : "reference to",
 884          name);
 885   return true;
 886 }