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)
409 /* Look for a text section and switch the readonly attribute in it. */
410 asection *found = bfd_get_section_by_name (output_bfd, ".text");
412 if (found != (asection *) NULL)
414 if (config.text_read_only)
415 found->flags |= SEC_READONLY;
417 found->flags &= ~SEC_READONLY;
421 if (link_info.relocateable)
422 output_bfd->flags &= ~EXEC_P;
424 output_bfd->flags |= EXEC_P;
428 if (config.map_file != NULL)
430 if (command_line.cref)
431 output_cref (config.map_file != NULL ? config.map_file : stdout);
432 if (nocrossref_list != NULL)
433 check_nocrossrefs ();
435 /* Even if we're producing relocateable output, some non-fatal errors should
436 be reported in the exit status. (What non-fatal errors, if any, do we
437 want to ignore for relocateable output?) */
439 if (config.make_executable == false && force_make_executable == false)
441 if (trace_files == true)
443 einfo (_("%P: link errors found, deleting executable `%s'\n"),
447 /* The file will be removed by remove_output. */
453 if (! bfd_close (output_bfd))
454 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
456 /* If the --force-exe-suffix is enabled, and we're making an
457 executable file and it doesn't end in .exe, copy it to one
459 if (! link_info.relocateable && command_line.force_exe_suffix)
461 int len = strlen (output_filename);
463 || (strcasecmp (output_filename + len - 4, ".exe") != 0
464 && strcasecmp (output_filename + len - 4, ".dll") != 0))
468 const int bsize = 4096;
469 char *buf = xmalloc (bsize);
471 char *dst_name = xmalloc (len + 5);
472 strcpy (dst_name, output_filename);
473 strcat (dst_name, ".exe");
474 src = fopen (output_filename, FOPEN_RB);
475 dst = fopen (dst_name, FOPEN_WB);
478 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
480 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
481 while ((l = fread (buf, 1, bsize, src)) > 0)
483 int done = fwrite (buf, 1, l, dst);
486 einfo (_("%P: Error writing file `%s'\n"), dst_name);
490 if (fclose (dst) == EOF)
492 einfo (_("%P: Error closing file `%s'\n"), dst_name);
500 END_PROGRESS (program_name);
505 char *lim = (char *) sbrk (0);
507 long run_time = get_run_time () - start_time;
509 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
510 program_name, run_time / 1000000, run_time % 1000000);
512 fprintf (stderr, _("%s: data size %ld\n"), program_name,
513 (long) (lim - (char *) &environ));
517 /* Prevent remove_output from doing anything, after a successful link. */
518 output_filename = NULL;
524 /* We need to find any explicitly given emulation in order to initialize the
525 state that's needed by the lex&yacc argument parser (parse_args). */
528 get_emulation (argc, argv)
535 emulation = getenv (EMULATION_ENVIRON);
536 if (emulation == NULL)
537 emulation = DEFAULT_EMULATION;
539 for (i = 1; i < argc; i++)
541 if (!strncmp (argv[i], "-m", 2))
543 if (argv[i][2] == '\0')
548 emulation = argv[i + 1];
553 einfo (_("%P%F: missing argument to -m\n"));
556 else if (strcmp (argv[i], "-mips1") == 0
557 || strcmp (argv[i], "-mips2") == 0
558 || strcmp (argv[i], "-mips3") == 0
559 || strcmp (argv[i], "-mips32") == 0
560 || strcmp (argv[i], "-mips64") == 0
561 || strcmp (argv[i], "-mips4") == 0
562 || strcmp (argv[i], "-mips5") == 0)
564 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
565 passed to the linker by some MIPS compilers. They
566 generally tell the linker to use a slightly different
567 library path. Perhaps someday these should be
568 implemented as emulations; until then, we just ignore
569 the arguments and hope that nobody ever creates
570 emulations named ips1, ips2 or ips3. */
572 else if (strcmp (argv[i], "-m486") == 0)
574 /* FIXME: The argument -m486 is passed to the linker on
575 some Linux systems. Hope that nobody creates an
576 emulation named 486. */
581 emulation = &argv[i][2];
589 /* If directory DIR contains an "ldscripts" subdirectory,
590 add DIR to the library search path and return true,
591 else return false. */
594 check_for_scripts_dir (dir)
602 dirlen = strlen (dir);
603 /* sizeof counts the terminating NUL. */
604 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
605 sprintf (buf, "%s/ldscripts", dir);
607 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
610 ldfile_add_library_path (dir, false);
614 /* Set the default directory for finding script files.
615 Libraries will be searched for here too, but that's ok.
616 We look for the "ldscripts" directory in:
618 SCRIPTDIR (passed from Makefile)
619 the dir where this program is (for using it from the build tree)
620 the dir where this program is/../lib (for installing the tool suite elsewhere) */
628 if (check_for_scripts_dir (SCRIPTDIR))
629 /* We've been installed normally. */
632 /* Look for "ldscripts" in the dir where our binary is. */
633 end = strrchr (program_name, '/');
634 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
636 /* We could have \foo\bar, or /foo\bar. */
637 char *bslash = strrchr (program_name, '\\');
638 if (end == NULL || (bslash != NULL && bslash > end))
645 /* Don't look for ldscripts in the current directory. There is
646 too much potential for confusion. */
650 dirlen = end - program_name;
651 /* Make a copy of program_name in dir.
652 Leave room for later "/../lib". */
653 dir = (char *) xmalloc (dirlen + 8);
654 strncpy (dir, program_name, dirlen);
657 if (check_for_scripts_dir (dir))
658 /* Don't free dir. */
661 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
662 strcpy (dir + dirlen, "/../lib");
663 if (check_for_scripts_dir (dir))
666 /* Well, we tried. */
674 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
676 link_info.notice_hash = ((struct bfd_hash_table *)
677 xmalloc (sizeof (struct bfd_hash_table)));
678 if (! bfd_hash_table_init_n (link_info.notice_hash,
681 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
684 if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
685 == (struct bfd_hash_entry *) NULL)
686 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
689 /* Record a symbol to be wrapped, from the --wrap option. */
695 if (link_info.wrap_hash == NULL)
697 link_info.wrap_hash = ((struct bfd_hash_table *)
698 xmalloc (sizeof (struct bfd_hash_table)));
699 if (! bfd_hash_table_init_n (link_info.wrap_hash,
702 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
704 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
705 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
708 /* Handle the -retain-symbols-file option. */
711 add_keepsyms_file (filename)
712 const char *filename;
719 if (link_info.strip == strip_some)
720 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
722 file = fopen (filename, "r");
723 if (file == (FILE *) NULL)
725 bfd_set_error (bfd_error_system_call);
726 einfo ("%X%P: %s: %E\n", filename);
730 link_info.keep_hash = ((struct bfd_hash_table *)
731 xmalloc (sizeof (struct bfd_hash_table)));
732 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
733 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
736 buf = (char *) xmalloc (bufsize);
748 while (! ISSPACE (c) && c != EOF)
755 buf = xrealloc (buf, bufsize);
762 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
763 == (struct bfd_hash_entry *) NULL)
764 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
768 if (link_info.strip != strip_none)
769 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
771 link_info.strip = strip_some;
774 /* Callbacks from the BFD linker routines. */
776 /* This is called when BFD has decided to include an archive member in
780 add_archive_element (info, abfd, name)
781 struct bfd_link_info *info ATTRIBUTE_UNUSED;
785 lang_input_statement_type *input;
787 input = ((lang_input_statement_type *)
788 xmalloc (sizeof (lang_input_statement_type)));
789 input->filename = abfd->filename;
790 input->local_sym_name = abfd->filename;
791 input->the_bfd = abfd;
792 input->asymbols = NULL;
794 input->just_syms_flag = false;
795 input->loaded = false;
796 input->search_dirs_flag = false;
798 /* FIXME: The following fields are not set: header.next,
799 header.type, closed, passive_position, symbol_count,
800 next_real_file, is_archive, target, real. This bit of code is
801 from the old decode_library_subfile function. I don't know
802 whether any of those fields matters. */
804 ldlang_add_file (input);
806 if (config.map_file != (FILE *) NULL)
808 static boolean header_printed;
809 struct bfd_link_hash_entry *h;
813 h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
825 case bfd_link_hash_defined:
826 case bfd_link_hash_defweak:
827 from = h->u.def.section->owner;
830 case bfd_link_hash_undefined:
831 case bfd_link_hash_undefweak:
832 from = h->u.undef.abfd;
835 case bfd_link_hash_common:
836 from = h->u.c.p->section->owner;
841 if (! header_printed)
845 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
847 header_printed = true;
850 if (bfd_my_archive (abfd) == NULL)
852 minfo ("%s", bfd_get_filename (abfd));
853 len = strlen (bfd_get_filename (abfd));
857 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
858 bfd_get_filename (abfd));
859 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
860 + strlen (bfd_get_filename (abfd))
878 minfo ("(%T)\n", h->root.string);
880 minfo ("(%s)\n", name);
883 if (trace_files || trace_file_tries)
884 info_msg ("%I\n", input);
889 /* This is called when BFD has discovered a symbol which is defined
893 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
894 struct bfd_link_info *info ATTRIBUTE_UNUSED;
903 /* If either section has the output_section field set to
904 bfd_abs_section_ptr, it means that the section is being
905 discarded, and this is not really a multiple definition at all.
906 FIXME: It would be cleaner to somehow ignore symbols defined in
907 sections which are being discarded. */
908 if ((osec->output_section != NULL
909 && ! bfd_is_abs_section (osec)
910 && bfd_is_abs_section (osec->output_section))
911 || (nsec->output_section != NULL
912 && ! bfd_is_abs_section (nsec)
913 && bfd_is_abs_section (nsec->output_section)))
916 einfo (_("%X%C: multiple definition of `%T'\n"),
917 nbfd, nsec, nval, name);
918 if (obfd != (bfd *) NULL)
919 einfo (_("%D: first defined here\n"), obfd, osec, oval);
921 if (command_line.relax)
923 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
924 command_line.relax = 0;
930 /* This is called when there is a definition of a common symbol, or
931 when a common symbol is found for a symbol that is already defined,
932 or when two common symbols are found. We only do something if
933 -warn-common was used. */
936 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
937 struct bfd_link_info *info ATTRIBUTE_UNUSED;
940 enum bfd_link_hash_type otype;
943 enum bfd_link_hash_type ntype;
946 if (! config.warn_common)
949 if (ntype == bfd_link_hash_defined
950 || ntype == bfd_link_hash_defweak
951 || ntype == bfd_link_hash_indirect)
953 ASSERT (otype == bfd_link_hash_common);
954 einfo (_("%B: warning: definition of `%T' overriding common\n"),
957 einfo (_("%B: warning: common is here\n"), obfd);
959 else if (otype == bfd_link_hash_defined
960 || otype == bfd_link_hash_defweak
961 || otype == bfd_link_hash_indirect)
963 ASSERT (ntype == bfd_link_hash_common);
964 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
967 einfo (_("%B: warning: defined here\n"), obfd);
971 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
974 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
977 einfo (_("%B: warning: larger common is here\n"), obfd);
979 else if (nsize > osize)
981 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
984 einfo (_("%B: warning: smaller common is here\n"), obfd);
988 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
990 einfo (_("%B: warning: previous common is here\n"), obfd);
997 /* This is called when BFD has discovered a set element. H is the
998 entry in the linker hash table for the set. SECTION and VALUE
999 represent a value which should be added to the set. */
1002 add_to_set (info, h, reloc, abfd, section, value)
1003 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1004 struct bfd_link_hash_entry *h;
1005 bfd_reloc_code_real_type reloc;
1010 if (config.warn_constructors)
1011 einfo (_("%P: warning: global constructor %s used\n"),
1014 if (! config.build_constructors)
1017 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1019 if (h->type == bfd_link_hash_new)
1021 h->type = bfd_link_hash_undefined;
1022 h->u.undef.abfd = abfd;
1023 /* We don't call bfd_link_add_undef to add this to the list of
1024 undefined symbols because we are going to define it
1031 /* This is called when BFD has discovered a constructor. This is only
1032 called for some object file formats--those which do not handle
1033 constructors in some more clever fashion. This is similar to
1034 adding an element to a set, but less general. */
1037 constructor_callback (info, constructor, name, abfd, section, value)
1038 struct bfd_link_info *info;
1039 boolean constructor;
1046 struct bfd_link_hash_entry *h;
1047 char set_name[1 + sizeof "__CTOR_LIST__"];
1049 if (config.warn_constructors)
1050 einfo (_("%P: warning: global constructor %s used\n"), name);
1052 if (! config.build_constructors)
1055 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1056 useful error message. */
1057 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1058 && (link_info.relocateable
1059 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1060 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1063 if (bfd_get_symbol_leading_char (abfd) != '\0')
1064 *s++ = bfd_get_symbol_leading_char (abfd);
1066 strcpy (s, "__CTOR_LIST__");
1068 strcpy (s, "__DTOR_LIST__");
1070 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1071 if (h == (struct bfd_link_hash_entry *) NULL)
1072 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1073 if (h->type == bfd_link_hash_new)
1075 h->type = bfd_link_hash_undefined;
1076 h->u.undef.abfd = abfd;
1077 /* We don't call bfd_link_add_undef to add this to the list of
1078 undefined symbols because we are going to define it
1082 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1086 /* A structure used by warning_callback to pass information through
1087 bfd_map_over_sections. */
1089 struct warning_callback_info {
1091 const char *warning;
1096 /* This is called when there is a reference to a warning symbol. */
1099 warning_callback (info, warning, symbol, abfd, section, address)
1100 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1101 const char *warning;
1107 /* This is a hack to support warn_multiple_gp. FIXME: This should
1108 have a cleaner interface, but what? */
1109 if (! config.warn_multiple_gp
1110 && strcmp (warning, "using multiple gp values") == 0)
1113 if (section != NULL)
1114 einfo ("%C: %s\n", abfd, section, address, warning);
1115 else if (abfd == NULL)
1116 einfo ("%P: %s\n", warning);
1117 else if (symbol == NULL)
1118 einfo ("%B: %s\n", abfd, warning);
1121 lang_input_statement_type *entry;
1123 struct warning_callback_info info;
1125 /* Look through the relocs to see if we can find a plausible
1128 entry = (lang_input_statement_type *) abfd->usrdata;
1129 if (entry != NULL && entry->asymbols != NULL)
1130 asymbols = entry->asymbols;
1136 symsize = bfd_get_symtab_upper_bound (abfd);
1138 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1139 asymbols = (asymbol **) xmalloc (symsize);
1140 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1141 if (symbol_count < 0)
1142 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1145 entry->asymbols = asymbols;
1146 entry->symbol_count = symbol_count;
1151 info.warning = warning;
1152 info.symbol = symbol;
1153 info.asymbols = asymbols;
1154 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1157 einfo ("%B: %s\n", abfd, warning);
1166 /* This is called by warning_callback for each section. It checks the
1167 relocs of the section to see if it can find a reference to the
1168 symbol which triggered the warning. If it can, it uses the reloc
1169 to give an error message with a file and line number. */
1172 warning_find_reloc (abfd, sec, iarg)
1177 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1181 arelent **p, **pend;
1186 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1188 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1192 relpp = (arelent **) xmalloc (relsize);
1193 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1195 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1198 pend = p + relcount;
1199 for (; p < pend && *p != NULL; p++)
1203 if (q->sym_ptr_ptr != NULL
1204 && *q->sym_ptr_ptr != NULL
1205 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1207 /* We found a reloc for the symbol we are looking for. */
1208 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1217 /* This is called when an undefined symbol is found. */
1220 undefined_symbol (info, name, abfd, section, address, fatal)
1221 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1226 boolean fatal ATTRIBUTE_UNUSED;
1228 static char *error_name;
1229 static unsigned int error_count;
1231 #define MAX_ERRORS_IN_A_ROW 5
1233 if (config.warn_once)
1235 static struct bfd_hash_table *hash;
1237 /* Only warn once about a particular undefined symbol. */
1241 hash = ((struct bfd_hash_table *)
1242 xmalloc (sizeof (struct bfd_hash_table)));
1243 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1244 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1247 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1250 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1251 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1254 /* We never print more than a reasonable number of errors in a row
1255 for a single symbol. */
1256 if (error_name != (char *) NULL
1257 && strcmp (name, error_name) == 0)
1262 if (error_name != (char *) NULL)
1264 error_name = xstrdup (name);
1267 if (section != NULL)
1269 if (error_count < MAX_ERRORS_IN_A_ROW)
1271 einfo (_("%C: undefined reference to `%T'\n"),
1272 abfd, section, address, name);
1276 else if (error_count == MAX_ERRORS_IN_A_ROW)
1277 einfo (_("%D: more undefined references to `%T' follow\n"),
1278 abfd, section, address, name);
1282 if (error_count < MAX_ERRORS_IN_A_ROW)
1284 einfo (_("%B: undefined reference to `%T'\n"),
1289 else if (error_count == MAX_ERRORS_IN_A_ROW)
1290 einfo (_("%B: more undefined references to `%T' follow\n"),
1297 /* This is called when a reloc overflows. */
1300 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1301 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1303 const char *reloc_name;
1309 if (abfd == (bfd *) NULL)
1310 einfo (_("%P%X: generated"));
1312 einfo ("%X%C:", abfd, section, address);
1313 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1315 einfo ("+%v", addend);
1320 /* This is called when a dangerous relocation is made. */
1323 reloc_dangerous (info, message, abfd, section, address)
1324 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1325 const char *message;
1330 if (abfd == (bfd *) NULL)
1331 einfo (_("%P%X: generated"));
1333 einfo ("%X%C:", abfd, section, address);
1334 einfo (_("dangerous relocation: %s\n"), message);
1338 /* This is called when a reloc is being generated attached to a symbol
1339 that is not being output. */
1342 unattached_reloc (info, name, abfd, section, address)
1343 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1349 if (abfd == (bfd *) NULL)
1350 einfo (_("%P%X: generated"));
1352 einfo ("%X%C:", abfd, section, address);
1353 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1357 /* This is called if link_info.notice_all is set, or when a symbol in
1358 link_info.notice_hash is found. Symbols are put in notice_hash
1359 using the -y option. */
1362 notice (info, name, abfd, section, value)
1363 struct bfd_link_info *info;
1369 if (! info->notice_all
1370 || (info->notice_hash != NULL
1371 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1373 if (bfd_is_und_section (section))
1374 einfo ("%B: reference to %s\n", abfd, name);
1376 einfo ("%B: definition of %s\n", abfd, name);
1379 if (command_line.cref || nocrossref_list != NULL)
1380 add_cref (name, abfd, section, value);