1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Written by Steve Chamberlain steve@cygnus.com
6 This file is part of GLD, the Gnu Linker.
8 GLD is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GLD is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
26 #include "safe-ctype.h"
27 #include "libiberty.h"
30 #include "filenames.h"
44 /* Somewhere above, sys/stat.h got included . . . . */
45 #if !defined(S_ISDIR) && defined(S_IFDIR)
46 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
52 #ifdef NEED_DECLARATION_SBRK
57 static char *get_emulation PARAMS ((int, char **));
58 static void set_scripts_dir PARAMS ((void));
63 const char *output_filename = "a.out";
65 /* Name this program was invoked by. */
68 /* The file that we're creating. */
71 /* Set by -G argument, for MIPS ECOFF target. */
72 int g_switch_value = 8;
74 /* Nonzero means print names of input files as processed. */
77 /* Nonzero means same, but note open failures, too. */
78 boolean trace_file_tries;
80 /* Nonzero means version number was printed, so exit successfully
81 instead of complaining if no input files are given. */
82 boolean version_printed;
84 /* Nonzero means link in every member of an archive. */
85 boolean whole_archive;
87 /* True if we should demangle symbol names. */
90 args_type command_line;
92 ld_config_type config;
94 static void remove_output PARAMS ((void));
95 static boolean check_for_scripts_dir PARAMS ((char *dir));
96 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
98 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
100 bfd *, asection *, bfd_vma,
101 bfd *, asection *, bfd_vma));
102 static boolean multiple_common PARAMS ((struct bfd_link_info *,
104 enum bfd_link_hash_type, bfd_vma,
105 bfd *, enum bfd_link_hash_type,
107 static boolean add_to_set PARAMS ((struct bfd_link_info *,
108 struct bfd_link_hash_entry *,
109 bfd_reloc_code_real_type,
110 bfd *, asection *, bfd_vma));
111 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
114 bfd *, asection *, bfd_vma));
115 static boolean warning_callback PARAMS ((struct bfd_link_info *,
116 const char *, const char *, bfd *,
117 asection *, bfd_vma));
118 static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
119 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
121 asection *, bfd_vma, boolean));
122 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
123 const char *, bfd_vma,
124 bfd *, asection *, bfd_vma));
125 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
126 bfd *, asection *, bfd_vma));
127 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
128 const char *, bfd *, asection *,
130 static boolean notice PARAMS ((struct bfd_link_info *, const char *,
131 bfd *, asection *, bfd_vma));
133 static struct bfd_link_callbacks link_callbacks = {
138 constructor_callback,
147 struct bfd_link_info link_info;
154 if (output_bfd && output_bfd->iostream)
155 fclose ((FILE *) (output_bfd->iostream));
156 if (delete_output_file_on_failure)
157 unlink (output_filename);
167 long start_time = get_run_time ();
169 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
170 setlocale (LC_MESSAGES, "");
172 #if defined (HAVE_SETLOCALE)
173 setlocale (LC_CTYPE, "");
175 bindtextdomain (PACKAGE, LOCALEDIR);
176 textdomain (PACKAGE);
178 program_name = argv[0];
179 xmalloc_set_program_name (program_name);
181 START_PROGRESS (program_name, 0);
185 bfd_set_error_program_name (program_name);
187 xatexit (remove_output);
189 /* Set the default BFD target based on the configured target. Doing
190 this permits the linker to be configured for a particular target,
191 and linked against a shared BFD library which was configured for
192 a different target. The macro TARGET is defined by Makefile. */
193 if (! bfd_set_default_target (TARGET))
195 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
199 /* Initialize the data about options. */
200 trace_files = trace_file_tries = version_printed = false;
201 whole_archive = false;
202 config.build_constructors = true;
203 config.dynamic_link = false;
204 config.has_shared = false;
205 config.split_by_reloc = (unsigned) -1;
206 config.split_by_file = (bfd_size_type) -1;
207 command_line.force_common_definition = false;
208 command_line.interpreter = NULL;
209 command_line.rpath = NULL;
210 command_line.warn_mismatch = true;
211 command_line.check_section_addresses = true;
213 /* We initialize DEMANGLING based on the environment variable
214 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
215 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
216 environment. Acting the same way here lets us provide the same
217 interface by default. */
218 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
220 link_info.callbacks = &link_callbacks;
221 link_info.relocateable = false;
222 link_info.emitrelocations = false;
223 link_info.shared = false;
224 link_info.symbolic = false;
225 link_info.export_dynamic = false;
226 link_info.static_link = false;
227 link_info.traditional_format = false;
228 link_info.optimize = false;
229 link_info.no_undefined = false;
230 link_info.allow_shlib_undefined = false;
231 link_info.strip = strip_none;
232 link_info.discard = discard_sec_merge;
233 link_info.keep_memory = true;
234 link_info.input_bfds = NULL;
235 link_info.create_object_symbols_section = NULL;
236 link_info.hash = NULL;
237 link_info.keep_hash = NULL;
238 link_info.notice_all = false;
239 link_info.notice_hash = NULL;
240 link_info.wrap_hash = NULL;
241 link_info.mpc860c0 = 0;
242 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
243 and _fini symbols. We are compatible. */
244 link_info.init_function = "_init";
245 link_info.fini_function = "_fini";
246 link_info.new_dtags = false;
247 link_info.flags = (bfd_vma) 0;
248 link_info.flags_1 = (bfd_vma) 0;
249 link_info.pei386_auto_import = false;
250 link_info.combreloc = false;
251 link_info.spare_dynamic_tags = 5;
253 ldfile_add_arch ("");
255 config.make_executable = true;
256 force_make_executable = false;
257 config.magic_demand_paged = true;
258 config.text_read_only = true;
260 emulation = get_emulation (argc, argv);
261 ldemul_choose_mode (emulation);
262 default_target = ldemul_choose_target ();
264 ldemul_before_parse ();
265 lang_has_input_file = false;
266 parse_args (argc, argv);
268 ldemul_set_symbols ();
270 if (link_info.relocateable)
272 if (command_line.gc_sections)
273 einfo ("%P%F: --gc-sections and -r may not be used together\n");
274 if (link_info.mpc860c0)
275 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
276 else if (command_line.relax)
277 einfo (_("%P%F: --relax and -r may not be used together\n"));
278 if (link_info.shared)
279 einfo (_("%P%F: -r and -shared may not be used together\n"));
282 if (! link_info.shared)
284 if (command_line.filter_shlib)
285 einfo (_("%P%F: -F may not be used without -shared\n"));
286 if (command_line.auxiliary_filters)
287 einfo (_("%P%F: -f may not be used without -shared\n"));
290 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
291 don't see how else this can be handled, since in this case we
292 must preserve all externally visible symbols. */
293 if (link_info.relocateable && link_info.strip == strip_all)
295 link_info.strip = strip_debugger;
296 if (link_info.discard == discard_sec_merge)
297 link_info.discard = discard_all;
300 /* This essentially adds another -L directory so this must be done after
301 the -L's in argv have been processed. */
304 /* If we have not already opened and parsed a linker script
305 read the emulation's appropriate default script. */
306 if (saved_script_handle == NULL)
309 char *s = ldemul_get_script (& isfile);
312 ldfile_open_command_file (s);
318 parser_input = input_script;
323 if (trace_file_tries)
325 info_msg (_("using %s linker script:\n"),
326 saved_script_handle ? "external" : "internal");
327 info_msg ("==================================================\n");
329 if (saved_script_handle)
331 static const int ld_bufsz = 8193;
333 char *buf = xmalloc (ld_bufsz);
335 rewind (saved_script_handle);
336 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
341 rewind (saved_script_handle);
348 info_msg (ldemul_get_script (& isfile));
351 info_msg ("\n==================================================\n");
356 if (lang_has_input_file == false)
360 einfo (_("%P%F: no input files\n"));
365 info_msg (_("%P: mode %s\n"), emulation);
368 ldemul_after_parse ();
370 if (config.map_filename)
372 if (strcmp (config.map_filename, "-") == 0)
374 config.map_file = stdout;
378 config.map_file = fopen (config.map_filename, FOPEN_WT);
379 if (config.map_file == (FILE *) NULL)
381 bfd_set_error (bfd_error_system_call);
382 einfo (_("%P%F: cannot open map file %s: %E\n"),
383 config.map_filename);
390 /* Print error messages for any missing symbols, for any warning
391 symbols, and possibly multiple definitions. */
393 if (! link_info.relocateable)
395 /* Look for a text section and switch the readonly attribute in it. */
396 asection *found = bfd_get_section_by_name (output_bfd, ".text");
398 if (found != (asection *) NULL)
400 if (config.text_read_only)
401 found->flags |= SEC_READONLY;
403 found->flags &= ~SEC_READONLY;
407 if (link_info.relocateable)
408 output_bfd->flags &= ~EXEC_P;
410 output_bfd->flags |= EXEC_P;
414 if (config.map_file != NULL)
416 if (command_line.cref)
417 output_cref (config.map_file != NULL ? config.map_file : stdout);
418 if (nocrossref_list != NULL)
419 check_nocrossrefs ();
421 /* Even if we're producing relocateable output, some non-fatal errors should
422 be reported in the exit status. (What non-fatal errors, if any, do we
423 want to ignore for relocateable output?) */
425 if (config.make_executable == false && force_make_executable == false)
427 if (trace_files == true)
429 einfo (_("%P: link errors found, deleting executable `%s'\n"),
433 /* The file will be removed by remove_output. */
439 if (! bfd_close (output_bfd))
440 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
442 /* If the --force-exe-suffix is enabled, and we're making an
443 executable file and it doesn't end in .exe, copy it to one
445 if (! link_info.relocateable && command_line.force_exe_suffix)
447 int len = strlen (output_filename);
449 || (strcasecmp (output_filename + len - 4, ".exe") != 0
450 && strcasecmp (output_filename + len - 4, ".dll") != 0))
454 const int bsize = 4096;
455 char *buf = xmalloc (bsize);
457 char *dst_name = xmalloc (len + 5);
458 strcpy (dst_name, output_filename);
459 strcat (dst_name, ".exe");
460 src = fopen (output_filename, FOPEN_RB);
461 dst = fopen (dst_name, FOPEN_WB);
464 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
466 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
467 while ((l = fread (buf, 1, bsize, src)) > 0)
469 int done = fwrite (buf, 1, l, dst);
472 einfo (_("%P: Error writing file `%s'\n"), dst_name);
476 if (fclose (dst) == EOF)
478 einfo (_("%P: Error closing file `%s'\n"), dst_name);
486 END_PROGRESS (program_name);
491 char *lim = (char *) sbrk (0);
493 long run_time = get_run_time () - start_time;
495 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
496 program_name, run_time / 1000000, run_time % 1000000);
498 fprintf (stderr, _("%s: data size %ld\n"), program_name,
499 (long) (lim - (char *) &environ));
503 /* Prevent remove_output from doing anything, after a successful link. */
504 output_filename = NULL;
510 /* We need to find any explicitly given emulation in order to initialize the
511 state that's needed by the lex&yacc argument parser (parse_args). */
514 get_emulation (argc, argv)
521 emulation = getenv (EMULATION_ENVIRON);
522 if (emulation == NULL)
523 emulation = DEFAULT_EMULATION;
525 for (i = 1; i < argc; i++)
527 if (!strncmp (argv[i], "-m", 2))
529 if (argv[i][2] == '\0')
534 emulation = argv[i + 1];
539 einfo (_("%P%F: missing argument to -m\n"));
542 else if (strcmp (argv[i], "-mips1") == 0
543 || strcmp (argv[i], "-mips2") == 0
544 || strcmp (argv[i], "-mips3") == 0
545 || strcmp (argv[i], "-mips32") == 0
546 || strcmp (argv[i], "-mips64") == 0
547 || strcmp (argv[i], "-mips4") == 0
548 || strcmp (argv[i], "-mips5") == 0)
550 /* FIXME: The arguments -mips1, -mips2 and -mips3 are
551 passed to the linker by some MIPS compilers. They
552 generally tell the linker to use a slightly different
553 library path. Perhaps someday these should be
554 implemented as emulations; until then, we just ignore
555 the arguments and hope that nobody ever creates
556 emulations named ips1, ips2 or ips3. */
558 else if (strcmp (argv[i], "-m486") == 0)
560 /* FIXME: The argument -m486 is passed to the linker on
561 some Linux systems. Hope that nobody creates an
562 emulation named 486. */
567 emulation = &argv[i][2];
575 /* If directory DIR contains an "ldscripts" subdirectory,
576 add DIR to the library search path and return true,
577 else return false. */
580 check_for_scripts_dir (dir)
588 dirlen = strlen (dir);
589 /* sizeof counts the terminating NUL. */
590 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
591 sprintf (buf, "%s/ldscripts", dir);
593 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
596 ldfile_add_library_path (dir, false);
600 /* Set the default directory for finding script files.
601 Libraries will be searched for here too, but that's ok.
602 We look for the "ldscripts" directory in:
604 SCRIPTDIR (passed from Makefile)
605 the dir where this program is (for using it from the build tree)
606 the dir where this program is/../lib (for installing the tool suite elsewhere) */
614 if (check_for_scripts_dir (SCRIPTDIR))
615 /* We've been installed normally. */
618 /* Look for "ldscripts" in the dir where our binary is. */
619 end = strrchr (program_name, '/');
620 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
622 /* We could have \foo\bar, or /foo\bar. */
623 char *bslash = strrchr (program_name, '\\');
624 if (end == NULL || (bslash != NULL && bslash > end))
631 /* Don't look for ldscripts in the current directory. There is
632 too much potential for confusion. */
636 dirlen = end - program_name;
637 /* Make a copy of program_name in dir.
638 Leave room for later "/../lib". */
639 dir = (char *) xmalloc (dirlen + 8);
640 strncpy (dir, program_name, dirlen);
643 if (check_for_scripts_dir (dir))
644 /* Don't free dir. */
647 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
648 strcpy (dir + dirlen, "/../lib");
649 if (check_for_scripts_dir (dir))
652 /* Well, we tried. */
660 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
662 link_info.notice_hash = ((struct bfd_hash_table *)
663 xmalloc (sizeof (struct bfd_hash_table)));
664 if (! bfd_hash_table_init_n (link_info.notice_hash,
667 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
670 if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
671 == (struct bfd_hash_entry *) NULL)
672 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
675 /* Record a symbol to be wrapped, from the --wrap option. */
681 if (link_info.wrap_hash == NULL)
683 link_info.wrap_hash = ((struct bfd_hash_table *)
684 xmalloc (sizeof (struct bfd_hash_table)));
685 if (! bfd_hash_table_init_n (link_info.wrap_hash,
688 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
690 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
691 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
694 /* Handle the -retain-symbols-file option. */
697 add_keepsyms_file (filename)
698 const char *filename;
705 if (link_info.strip == strip_some)
706 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
708 file = fopen (filename, "r");
709 if (file == (FILE *) NULL)
711 bfd_set_error (bfd_error_system_call);
712 einfo ("%X%P: %s: %E\n", filename);
716 link_info.keep_hash = ((struct bfd_hash_table *)
717 xmalloc (sizeof (struct bfd_hash_table)));
718 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
719 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
722 buf = (char *) xmalloc (bufsize);
734 while (! ISSPACE (c) && c != EOF)
741 buf = xrealloc (buf, bufsize);
748 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
749 == (struct bfd_hash_entry *) NULL)
750 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
754 if (link_info.strip != strip_none)
755 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
757 link_info.strip = strip_some;
760 /* Callbacks from the BFD linker routines. */
762 /* This is called when BFD has decided to include an archive member in
766 add_archive_element (info, abfd, name)
767 struct bfd_link_info *info ATTRIBUTE_UNUSED;
771 lang_input_statement_type *input;
773 input = ((lang_input_statement_type *)
774 xmalloc (sizeof (lang_input_statement_type)));
775 input->filename = abfd->filename;
776 input->local_sym_name = abfd->filename;
777 input->the_bfd = abfd;
778 input->asymbols = NULL;
780 input->just_syms_flag = false;
781 input->loaded = false;
782 input->search_dirs_flag = false;
784 /* FIXME: The following fields are not set: header.next,
785 header.type, closed, passive_position, symbol_count,
786 next_real_file, is_archive, target, real. This bit of code is
787 from the old decode_library_subfile function. I don't know
788 whether any of those fields matters. */
790 ldlang_add_file (input);
792 if (config.map_file != (FILE *) NULL)
794 static boolean header_printed;
795 struct bfd_link_hash_entry *h;
799 h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
811 case bfd_link_hash_defined:
812 case bfd_link_hash_defweak:
813 from = h->u.def.section->owner;
816 case bfd_link_hash_undefined:
817 case bfd_link_hash_undefweak:
818 from = h->u.undef.abfd;
821 case bfd_link_hash_common:
822 from = h->u.c.p->section->owner;
827 if (! header_printed)
831 sprintf (buf, "%-29s %s\n\n", _("Archive member included"),
832 _("because of file (symbol)"));
834 header_printed = true;
837 if (bfd_my_archive (abfd) == NULL)
839 minfo ("%s", bfd_get_filename (abfd));
840 len = strlen (bfd_get_filename (abfd));
844 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
845 bfd_get_filename (abfd));
846 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
847 + strlen (bfd_get_filename (abfd))
865 minfo ("(%T)\n", h->root.string);
867 minfo ("(%s)\n", name);
870 if (trace_files || trace_file_tries)
871 info_msg ("%I\n", input);
876 /* This is called when BFD has discovered a symbol which is defined
880 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
881 struct bfd_link_info *info ATTRIBUTE_UNUSED;
890 /* If either section has the output_section field set to
891 bfd_abs_section_ptr, it means that the section is being
892 discarded, and this is not really a multiple definition at all.
893 FIXME: It would be cleaner to somehow ignore symbols defined in
894 sections which are being discarded. */
895 if ((osec->output_section != NULL
896 && ! bfd_is_abs_section (osec)
897 && bfd_is_abs_section (osec->output_section))
898 || (nsec->output_section != NULL
899 && ! bfd_is_abs_section (nsec)
900 && bfd_is_abs_section (nsec->output_section)))
903 einfo (_("%X%C: multiple definition of `%T'\n"),
904 nbfd, nsec, nval, name);
905 if (obfd != (bfd *) NULL)
906 einfo (_("%D: first defined here\n"), obfd, osec, oval);
908 if (command_line.relax)
910 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
911 command_line.relax = 0;
917 /* This is called when there is a definition of a common symbol, or
918 when a common symbol is found for a symbol that is already defined,
919 or when two common symbols are found. We only do something if
920 -warn-common was used. */
923 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
924 struct bfd_link_info *info ATTRIBUTE_UNUSED;
927 enum bfd_link_hash_type otype;
930 enum bfd_link_hash_type ntype;
933 if (! config.warn_common)
936 if (ntype == bfd_link_hash_defined
937 || ntype == bfd_link_hash_defweak
938 || ntype == bfd_link_hash_indirect)
940 ASSERT (otype == bfd_link_hash_common);
941 einfo (_("%B: warning: definition of `%T' overriding common\n"),
944 einfo (_("%B: warning: common is here\n"), obfd);
946 else if (otype == bfd_link_hash_defined
947 || otype == bfd_link_hash_defweak
948 || otype == bfd_link_hash_indirect)
950 ASSERT (ntype == bfd_link_hash_common);
951 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
954 einfo (_("%B: warning: defined here\n"), obfd);
958 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
961 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
964 einfo (_("%B: warning: larger common is here\n"), obfd);
966 else if (nsize > osize)
968 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
971 einfo (_("%B: warning: smaller common is here\n"), obfd);
975 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
977 einfo (_("%B: warning: previous common is here\n"), obfd);
984 /* This is called when BFD has discovered a set element. H is the
985 entry in the linker hash table for the set. SECTION and VALUE
986 represent a value which should be added to the set. */
989 add_to_set (info, h, reloc, abfd, section, value)
990 struct bfd_link_info *info ATTRIBUTE_UNUSED;
991 struct bfd_link_hash_entry *h;
992 bfd_reloc_code_real_type reloc;
997 if (config.warn_constructors)
998 einfo (_("%P: warning: global constructor %s used\n"),
1001 if (! config.build_constructors)
1004 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1006 if (h->type == bfd_link_hash_new)
1008 h->type = bfd_link_hash_undefined;
1009 h->u.undef.abfd = abfd;
1010 /* We don't call bfd_link_add_undef to add this to the list of
1011 undefined symbols because we are going to define it
1018 /* This is called when BFD has discovered a constructor. This is only
1019 called for some object file formats--those which do not handle
1020 constructors in some more clever fashion. This is similar to
1021 adding an element to a set, but less general. */
1024 constructor_callback (info, constructor, name, abfd, section, value)
1025 struct bfd_link_info *info;
1026 boolean constructor;
1033 struct bfd_link_hash_entry *h;
1034 char set_name[1 + sizeof "__CTOR_LIST__"];
1036 if (config.warn_constructors)
1037 einfo (_("%P: warning: global constructor %s used\n"), name);
1039 if (! config.build_constructors)
1042 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1043 useful error message. */
1044 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1045 && (link_info.relocateable
1046 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1047 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1050 if (bfd_get_symbol_leading_char (abfd) != '\0')
1051 *s++ = bfd_get_symbol_leading_char (abfd);
1053 strcpy (s, "__CTOR_LIST__");
1055 strcpy (s, "__DTOR_LIST__");
1057 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1058 if (h == (struct bfd_link_hash_entry *) NULL)
1059 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1060 if (h->type == bfd_link_hash_new)
1062 h->type = bfd_link_hash_undefined;
1063 h->u.undef.abfd = abfd;
1064 /* We don't call bfd_link_add_undef to add this to the list of
1065 undefined symbols because we are going to define it
1069 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1073 /* A structure used by warning_callback to pass information through
1074 bfd_map_over_sections. */
1076 struct warning_callback_info {
1078 const char *warning;
1083 /* This is called when there is a reference to a warning symbol. */
1086 warning_callback (info, warning, symbol, abfd, section, address)
1087 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1088 const char *warning;
1094 /* This is a hack to support warn_multiple_gp. FIXME: This should
1095 have a cleaner interface, but what? */
1096 if (! config.warn_multiple_gp
1097 && strcmp (warning, "using multiple gp values") == 0)
1100 if (section != NULL)
1101 einfo ("%C: %s\n", abfd, section, address, warning);
1102 else if (abfd == NULL)
1103 einfo ("%P: %s\n", warning);
1104 else if (symbol == NULL)
1105 einfo ("%B: %s\n", abfd, warning);
1108 lang_input_statement_type *entry;
1110 struct warning_callback_info info;
1112 /* Look through the relocs to see if we can find a plausible
1115 entry = (lang_input_statement_type *) abfd->usrdata;
1116 if (entry != NULL && entry->asymbols != NULL)
1117 asymbols = entry->asymbols;
1123 symsize = bfd_get_symtab_upper_bound (abfd);
1125 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1126 asymbols = (asymbol **) xmalloc (symsize);
1127 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1128 if (symbol_count < 0)
1129 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1132 entry->asymbols = asymbols;
1133 entry->symbol_count = symbol_count;
1138 info.warning = warning;
1139 info.symbol = symbol;
1140 info.asymbols = asymbols;
1141 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1144 einfo ("%B: %s\n", abfd, warning);
1153 /* This is called by warning_callback for each section. It checks the
1154 relocs of the section to see if it can find a reference to the
1155 symbol which triggered the warning. If it can, it uses the reloc
1156 to give an error message with a file and line number. */
1159 warning_find_reloc (abfd, sec, iarg)
1164 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1168 arelent **p, **pend;
1173 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1175 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1179 relpp = (arelent **) xmalloc (relsize);
1180 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1182 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1185 pend = p + relcount;
1186 for (; p < pend && *p != NULL; p++)
1190 if (q->sym_ptr_ptr != NULL
1191 && *q->sym_ptr_ptr != NULL
1192 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1194 /* We found a reloc for the symbol we are looking for. */
1195 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1204 /* This is called when an undefined symbol is found. */
1207 undefined_symbol (info, name, abfd, section, address, fatal)
1208 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1213 boolean fatal ATTRIBUTE_UNUSED;
1215 static char *error_name;
1216 static unsigned int error_count;
1218 #define MAX_ERRORS_IN_A_ROW 5
1220 if (config.warn_once)
1222 static struct bfd_hash_table *hash;
1224 /* Only warn once about a particular undefined symbol. */
1228 hash = ((struct bfd_hash_table *)
1229 xmalloc (sizeof (struct bfd_hash_table)));
1230 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1231 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1234 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1237 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1238 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1241 /* We never print more than a reasonable number of errors in a row
1242 for a single symbol. */
1243 if (error_name != (char *) NULL
1244 && strcmp (name, error_name) == 0)
1249 if (error_name != (char *) NULL)
1251 error_name = xstrdup (name);
1254 if (section != NULL)
1256 if (error_count < MAX_ERRORS_IN_A_ROW)
1258 einfo (_("%C: undefined reference to `%T'\n"),
1259 abfd, section, address, name);
1263 else if (error_count == MAX_ERRORS_IN_A_ROW)
1264 einfo (_("%D: more undefined references to `%T' follow\n"),
1265 abfd, section, address, name);
1269 if (error_count < MAX_ERRORS_IN_A_ROW)
1271 einfo (_("%B: undefined reference to `%T'\n"),
1276 else if (error_count == MAX_ERRORS_IN_A_ROW)
1277 einfo (_("%B: more undefined references to `%T' follow\n"),
1284 /* This is called when a reloc overflows. */
1287 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1288 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1290 const char *reloc_name;
1296 if (abfd == (bfd *) NULL)
1297 einfo (_("%P%X: generated"));
1299 einfo ("%X%C:", abfd, section, address);
1300 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1302 einfo ("+%v", addend);
1307 /* This is called when a dangerous relocation is made. */
1310 reloc_dangerous (info, message, abfd, section, address)
1311 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1312 const char *message;
1317 if (abfd == (bfd *) NULL)
1318 einfo (_("%P%X: generated"));
1320 einfo ("%X%C:", abfd, section, address);
1321 einfo (_("dangerous relocation: %s\n"), message);
1325 /* This is called when a reloc is being generated attached to a symbol
1326 that is not being output. */
1329 unattached_reloc (info, name, abfd, section, address)
1330 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1336 if (abfd == (bfd *) NULL)
1337 einfo (_("%P%X: generated"));
1339 einfo ("%X%C:", abfd, section, address);
1340 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1344 /* This is called if link_info.notice_all is set, or when a symbol in
1345 link_info.notice_hash is found. Symbols are put in notice_hash
1346 using the -y option. */
1349 notice (info, name, abfd, section, value)
1350 struct bfd_link_info *info;
1356 if (! info->notice_all
1357 || (info->notice_hash != NULL
1358 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1360 if (bfd_is_und_section (section))
1361 einfo ("%B: reference to %s\n", abfd, name);
1363 einfo ("%B: definition of %s\n", abfd, name);
1366 if (command_line.cref || nocrossref_list != NULL)
1367 add_cref (name, abfd, section, value);