1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of GLD, the Gnu Linker.
9 GLD is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GLD is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 #include "filenames.h"
45 /* Somewhere above, sys/stat.h got included . . . . */
46 #if !defined(S_ISDIR) && defined(S_IFDIR)
47 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
53 #ifdef NEED_DECLARATION_SBRK
58 int main PARAMS ((int, char **));
60 static char *get_emulation PARAMS ((int, char **));
61 static void set_scripts_dir PARAMS ((void));
66 const char *output_filename = "a.out";
68 /* Name this program was invoked by. */
71 /* The file that we're creating. */
74 /* Set by -G argument, for MIPS ECOFF target. */
75 int g_switch_value = 8;
77 /* Nonzero means print names of input files as processed. */
80 /* Nonzero means same, but note open failures, too. */
81 boolean trace_file_tries;
83 /* Nonzero means version number was printed, so exit successfully
84 instead of complaining if no input files are given. */
85 boolean version_printed;
87 /* Nonzero means link in every member of an archive. */
88 boolean whole_archive;
90 /* True if we should demangle symbol names. */
93 args_type command_line;
95 ld_config_type config;
97 static void remove_output PARAMS ((void));
98 static boolean check_for_scripts_dir PARAMS ((char *dir));
99 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
101 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
103 bfd *, asection *, bfd_vma,
104 bfd *, asection *, bfd_vma));
105 static boolean multiple_common PARAMS ((struct bfd_link_info *,
107 enum bfd_link_hash_type, bfd_vma,
108 bfd *, enum bfd_link_hash_type,
110 static boolean add_to_set PARAMS ((struct bfd_link_info *,
111 struct bfd_link_hash_entry *,
112 bfd_reloc_code_real_type,
113 bfd *, asection *, bfd_vma));
114 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
117 bfd *, asection *, bfd_vma));
118 static boolean warning_callback PARAMS ((struct bfd_link_info *,
119 const char *, const char *, bfd *,
120 asection *, bfd_vma));
121 static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
122 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
124 asection *, bfd_vma, boolean));
125 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
126 const char *, bfd_vma,
127 bfd *, asection *, bfd_vma));
128 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
129 bfd *, asection *, bfd_vma));
130 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
131 const char *, bfd *, asection *,
133 static boolean notice PARAMS ((struct bfd_link_info *, const char *,
134 bfd *, asection *, bfd_vma));
136 static struct bfd_link_callbacks link_callbacks = {
141 constructor_callback,
150 struct bfd_link_info link_info;
157 if (output_bfd && output_bfd->iostream)
158 fclose ((FILE *) (output_bfd->iostream));
159 if (delete_output_file_on_failure)
160 unlink (output_filename);
170 long start_time = get_run_time ();
172 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
173 setlocale (LC_MESSAGES, "");
175 #if defined (HAVE_SETLOCALE)
176 setlocale (LC_CTYPE, "");
178 bindtextdomain (PACKAGE, LOCALEDIR);
179 textdomain (PACKAGE);
181 program_name = argv[0];
182 xmalloc_set_program_name (program_name);
184 START_PROGRESS (program_name, 0);
188 bfd_set_error_program_name (program_name);
190 xatexit (remove_output);
192 /* Set the default BFD target based on the configured target. Doing
193 this permits the linker to be configured for a particular target,
194 and linked against a shared BFD library which was configured for
195 a different target. The macro TARGET is defined by Makefile. */
196 if (! bfd_set_default_target (TARGET))
198 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
209 /* Initialize the data about options. */
210 trace_files = trace_file_tries = version_printed = false;
211 whole_archive = false;
212 config.build_constructors = true;
213 config.dynamic_link = false;
214 config.has_shared = false;
215 config.split_by_reloc = (unsigned) -1;
216 config.split_by_file = (bfd_size_type) -1;
217 command_line.force_common_definition = false;
218 command_line.inhibit_common_definition = false;
219 command_line.interpreter = NULL;
220 command_line.rpath = NULL;
221 command_line.warn_mismatch = true;
222 command_line.check_section_addresses = true;
224 /* We initialize DEMANGLING based on the environment variable
225 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
226 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
227 environment. Acting the same way here lets us provide the same
228 interface by default. */
229 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
231 link_info.callbacks = &link_callbacks;
232 link_info.relocateable = false;
233 link_info.emitrelocations = false;
234 link_info.shared = false;
235 link_info.symbolic = false;
236 link_info.export_dynamic = false;
237 link_info.static_link = false;
238 link_info.traditional_format = false;
239 link_info.optimize = false;
240 link_info.no_undefined = false;
241 link_info.allow_shlib_undefined = false;
242 link_info.strip = strip_none;
243 link_info.discard = discard_sec_merge;
244 link_info.keep_memory = true;
245 link_info.input_bfds = NULL;
246 link_info.create_object_symbols_section = NULL;
247 link_info.hash = NULL;
248 link_info.keep_hash = NULL;
249 link_info.notice_all = false;
250 link_info.notice_hash = NULL;
251 link_info.wrap_hash = NULL;
252 link_info.mpc860c0 = 0;
253 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
254 and _fini symbols. We are compatible. */
255 link_info.init_function = "_init";
256 link_info.fini_function = "_fini";
257 link_info.new_dtags = false;
258 link_info.eh_frame_hdr = false;
259 link_info.flags = (bfd_vma) 0;
260 link_info.flags_1 = (bfd_vma) 0;
261 link_info.pei386_auto_import = false;
262 link_info.combreloc = false;
263 link_info.spare_dynamic_tags = 5;
265 ldfile_add_arch ("");
267 config.make_executable = true;
268 force_make_executable = false;
269 config.magic_demand_paged = true;
270 config.text_read_only = true;
272 emulation = get_emulation (argc, argv);
273 ldemul_choose_mode (emulation);
274 default_target = ldemul_choose_target (argc, argv);
276 ldemul_before_parse ();
277 lang_has_input_file = false;
278 parse_args (argc, argv);
280 ldemul_set_symbols ();
282 if (link_info.relocateable)
284 if (command_line.gc_sections)
285 einfo ("%P%F: --gc-sections and -r may not be used together\n");
286 if (link_info.mpc860c0)
287 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
288 else if (command_line.relax)
289 einfo (_("%P%F: --relax and -r may not be used together\n"));
290 if (link_info.shared)
291 einfo (_("%P%F: -r and -shared may not be used together\n"));
294 if (! link_info.shared)
296 if (command_line.filter_shlib)
297 einfo (_("%P%F: -F may not be used without -shared\n"));
298 if (command_line.auxiliary_filters)
299 einfo (_("%P%F: -f may not be used without -shared\n"));
302 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
303 don't see how else this can be handled, since in this case we
304 must preserve all externally visible symbols. */
305 if (link_info.relocateable && link_info.strip == strip_all)
307 link_info.strip = strip_debugger;
308 if (link_info.discard == discard_sec_merge)
309 link_info.discard = discard_all;
312 /* This essentially adds another -L directory so this must be done after
313 the -L's in argv have been processed. */
316 /* If we have not already opened and parsed a linker script
317 read the emulation's appropriate default script. */
318 if (saved_script_handle == NULL)
321 char *s = ldemul_get_script (&isfile);
324 ldfile_open_command_file (s);
330 parser_input = input_script;
335 if (trace_file_tries)
337 if (saved_script_handle)
338 info_msg (_("using external linker script:"));
340 info_msg (_("using internal linker script:"));
341 info_msg ("\n==================================================\n");
343 if (saved_script_handle)
345 static const int ld_bufsz = 8193;
347 char *buf = xmalloc (ld_bufsz);
349 rewind (saved_script_handle);
350 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
355 rewind (saved_script_handle);
362 info_msg (ldemul_get_script (&isfile));
365 info_msg ("\n==================================================\n");
370 if (lang_has_input_file == false)
374 einfo (_("%P%F: no input files\n"));
379 info_msg (_("%P: mode %s\n"), emulation);
382 ldemul_after_parse ();
384 if (config.map_filename)
386 if (strcmp (config.map_filename, "-") == 0)
388 config.map_file = stdout;
392 config.map_file = fopen (config.map_filename, FOPEN_WT);
393 if (config.map_file == (FILE *) NULL)
395 bfd_set_error (bfd_error_system_call);
396 einfo (_("%P%F: cannot open map file %s: %E\n"),
397 config.map_filename);
404 /* Print error messages for any missing symbols, for any warning
405 symbols, and possibly multiple definitions. */
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, -mips3, etc. 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, _("Archive member included because of file (symbol)\n\n"));
833 header_printed = true;
836 if (bfd_my_archive (abfd) == NULL)
838 minfo ("%s", bfd_get_filename (abfd));
839 len = strlen (bfd_get_filename (abfd));
843 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
844 bfd_get_filename (abfd));
845 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
846 + strlen (bfd_get_filename (abfd))
864 minfo ("(%T)\n", h->root.string);
866 minfo ("(%s)\n", name);
869 if (trace_files || trace_file_tries)
870 info_msg ("%I\n", input);
875 /* This is called when BFD has discovered a symbol which is defined
879 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
880 struct bfd_link_info *info ATTRIBUTE_UNUSED;
889 /* If either section has the output_section field set to
890 bfd_abs_section_ptr, it means that the section is being
891 discarded, and this is not really a multiple definition at all.
892 FIXME: It would be cleaner to somehow ignore symbols defined in
893 sections which are being discarded. */
894 if ((osec->output_section != NULL
895 && ! bfd_is_abs_section (osec)
896 && bfd_is_abs_section (osec->output_section))
897 || (nsec->output_section != NULL
898 && ! bfd_is_abs_section (nsec)
899 && bfd_is_abs_section (nsec->output_section)))
902 einfo (_("%X%C: multiple definition of `%T'\n"),
903 nbfd, nsec, nval, name);
904 if (obfd != (bfd *) NULL)
905 einfo (_("%D: first defined here\n"), obfd, osec, oval);
907 if (command_line.relax)
909 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
910 command_line.relax = 0;
916 /* This is called when there is a definition of a common symbol, or
917 when a common symbol is found for a symbol that is already defined,
918 or when two common symbols are found. We only do something if
919 -warn-common was used. */
922 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
923 struct bfd_link_info *info ATTRIBUTE_UNUSED;
926 enum bfd_link_hash_type otype;
929 enum bfd_link_hash_type ntype;
932 if (! config.warn_common)
935 if (ntype == bfd_link_hash_defined
936 || ntype == bfd_link_hash_defweak
937 || ntype == bfd_link_hash_indirect)
939 ASSERT (otype == bfd_link_hash_common);
940 einfo (_("%B: warning: definition of `%T' overriding common\n"),
943 einfo (_("%B: warning: common is here\n"), obfd);
945 else if (otype == bfd_link_hash_defined
946 || otype == bfd_link_hash_defweak
947 || otype == bfd_link_hash_indirect)
949 ASSERT (ntype == bfd_link_hash_common);
950 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
953 einfo (_("%B: warning: defined here\n"), obfd);
957 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
960 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
963 einfo (_("%B: warning: larger common is here\n"), obfd);
965 else if (nsize > osize)
967 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
970 einfo (_("%B: warning: smaller common is here\n"), obfd);
974 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
976 einfo (_("%B: warning: previous common is here\n"), obfd);
983 /* This is called when BFD has discovered a set element. H is the
984 entry in the linker hash table for the set. SECTION and VALUE
985 represent a value which should be added to the set. */
988 add_to_set (info, h, reloc, abfd, section, value)
989 struct bfd_link_info *info ATTRIBUTE_UNUSED;
990 struct bfd_link_hash_entry *h;
991 bfd_reloc_code_real_type reloc;
996 if (config.warn_constructors)
997 einfo (_("%P: warning: global constructor %s used\n"),
1000 if (! config.build_constructors)
1003 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1005 if (h->type == bfd_link_hash_new)
1007 h->type = bfd_link_hash_undefined;
1008 h->u.undef.abfd = abfd;
1009 /* We don't call bfd_link_add_undef to add this to the list of
1010 undefined symbols because we are going to define it
1017 /* This is called when BFD has discovered a constructor. This is only
1018 called for some object file formats--those which do not handle
1019 constructors in some more clever fashion. This is similar to
1020 adding an element to a set, but less general. */
1023 constructor_callback (info, constructor, name, abfd, section, value)
1024 struct bfd_link_info *info;
1025 boolean constructor;
1032 struct bfd_link_hash_entry *h;
1033 char set_name[1 + sizeof "__CTOR_LIST__"];
1035 if (config.warn_constructors)
1036 einfo (_("%P: warning: global constructor %s used\n"), name);
1038 if (! config.build_constructors)
1041 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1042 useful error message. */
1043 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1044 && (link_info.relocateable
1045 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1046 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1049 if (bfd_get_symbol_leading_char (abfd) != '\0')
1050 *s++ = bfd_get_symbol_leading_char (abfd);
1052 strcpy (s, "__CTOR_LIST__");
1054 strcpy (s, "__DTOR_LIST__");
1056 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1057 if (h == (struct bfd_link_hash_entry *) NULL)
1058 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1059 if (h->type == bfd_link_hash_new)
1061 h->type = bfd_link_hash_undefined;
1062 h->u.undef.abfd = abfd;
1063 /* We don't call bfd_link_add_undef to add this to the list of
1064 undefined symbols because we are going to define it
1068 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1072 /* A structure used by warning_callback to pass information through
1073 bfd_map_over_sections. */
1075 struct warning_callback_info {
1077 const char *warning;
1082 /* This is called when there is a reference to a warning symbol. */
1085 warning_callback (info, warning, symbol, abfd, section, address)
1086 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1087 const char *warning;
1093 /* This is a hack to support warn_multiple_gp. FIXME: This should
1094 have a cleaner interface, but what? */
1095 if (! config.warn_multiple_gp
1096 && strcmp (warning, "using multiple gp values") == 0)
1099 if (section != NULL)
1100 einfo ("%C: %s\n", abfd, section, address, warning);
1101 else if (abfd == NULL)
1102 einfo ("%P: %s\n", warning);
1103 else if (symbol == NULL)
1104 einfo ("%B: %s\n", abfd, warning);
1107 lang_input_statement_type *entry;
1109 struct warning_callback_info info;
1111 /* Look through the relocs to see if we can find a plausible
1114 entry = (lang_input_statement_type *) abfd->usrdata;
1115 if (entry != NULL && entry->asymbols != NULL)
1116 asymbols = entry->asymbols;
1122 symsize = bfd_get_symtab_upper_bound (abfd);
1124 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1125 asymbols = (asymbol **) xmalloc (symsize);
1126 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1127 if (symbol_count < 0)
1128 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1131 entry->asymbols = asymbols;
1132 entry->symbol_count = symbol_count;
1137 info.warning = warning;
1138 info.symbol = symbol;
1139 info.asymbols = asymbols;
1140 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1143 einfo ("%B: %s\n", abfd, warning);
1152 /* This is called by warning_callback for each section. It checks the
1153 relocs of the section to see if it can find a reference to the
1154 symbol which triggered the warning. If it can, it uses the reloc
1155 to give an error message with a file and line number. */
1158 warning_find_reloc (abfd, sec, iarg)
1163 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1167 arelent **p, **pend;
1172 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1174 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1178 relpp = (arelent **) xmalloc (relsize);
1179 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1181 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1184 pend = p + relcount;
1185 for (; p < pend && *p != NULL; p++)
1189 if (q->sym_ptr_ptr != NULL
1190 && *q->sym_ptr_ptr != NULL
1191 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1193 /* We found a reloc for the symbol we are looking for. */
1194 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1203 /* This is called when an undefined symbol is found. */
1206 undefined_symbol (info, name, abfd, section, address, fatal)
1207 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1212 boolean fatal ATTRIBUTE_UNUSED;
1214 static char *error_name;
1215 static unsigned int error_count;
1217 #define MAX_ERRORS_IN_A_ROW 5
1219 if (config.warn_once)
1221 static struct bfd_hash_table *hash;
1223 /* Only warn once about a particular undefined symbol. */
1227 hash = ((struct bfd_hash_table *)
1228 xmalloc (sizeof (struct bfd_hash_table)));
1229 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1230 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1233 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1236 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1237 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1240 /* We never print more than a reasonable number of errors in a row
1241 for a single symbol. */
1242 if (error_name != (char *) NULL
1243 && strcmp (name, error_name) == 0)
1248 if (error_name != (char *) NULL)
1250 error_name = xstrdup (name);
1253 if (section != NULL)
1255 if (error_count < MAX_ERRORS_IN_A_ROW)
1257 einfo (_("%C: undefined reference to `%T'\n"),
1258 abfd, section, address, name);
1262 else if (error_count == MAX_ERRORS_IN_A_ROW)
1263 einfo (_("%D: more undefined references to `%T' follow\n"),
1264 abfd, section, address, name);
1268 if (error_count < MAX_ERRORS_IN_A_ROW)
1270 einfo (_("%B: undefined reference to `%T'\n"),
1275 else if (error_count == MAX_ERRORS_IN_A_ROW)
1276 einfo (_("%B: more undefined references to `%T' follow\n"),
1283 /* This is called when a reloc overflows. */
1286 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1287 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1289 const char *reloc_name;
1295 if (abfd == (bfd *) NULL)
1296 einfo (_("%P%X: generated"));
1298 einfo ("%X%C:", abfd, section, address);
1299 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1301 einfo ("+%v", addend);
1306 /* This is called when a dangerous relocation is made. */
1309 reloc_dangerous (info, message, abfd, section, address)
1310 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1311 const char *message;
1316 if (abfd == (bfd *) NULL)
1317 einfo (_("%P%X: generated"));
1319 einfo ("%X%C:", abfd, section, address);
1320 einfo (_("dangerous relocation: %s\n"), message);
1324 /* This is called when a reloc is being generated attached to a symbol
1325 that is not being output. */
1328 unattached_reloc (info, name, abfd, section, address)
1329 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1335 if (abfd == (bfd *) NULL)
1336 einfo (_("%P%X: generated"));
1338 einfo ("%X%C:", abfd, section, address);
1339 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1343 /* This is called if link_info.notice_all is set, or when a symbol in
1344 link_info.notice_hash is found. Symbols are put in notice_hash
1345 using the -y option. */
1348 notice (info, name, abfd, section, value)
1349 struct bfd_link_info *info;
1355 if (! info->notice_all
1356 || (info->notice_hash != NULL
1357 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1359 if (bfd_is_und_section (section))
1360 einfo ("%B: reference to %s\n", abfd, name);
1362 einfo ("%B: definition of %s\n", abfd, name);
1365 if (command_line.cref || nocrossref_list != NULL)
1366 add_cref (name, abfd, section, value);