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. */
78 bfd_boolean trace_files;
80 /* Nonzero means same, but note open failures, too. */
81 bfd_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 bfd_boolean version_printed;
87 /* Nonzero means link in every member of an archive. */
88 bfd_boolean whole_archive;
90 /* TRUE if we should demangle symbol names. */
91 bfd_boolean demangling;
93 args_type command_line;
95 ld_config_type config;
97 static void remove_output PARAMS ((void));
98 static bfd_boolean check_for_scripts_dir PARAMS ((char *dir));
99 static bfd_boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
101 static bfd_boolean multiple_definition PARAMS ((struct bfd_link_info *,
103 bfd *, asection *, bfd_vma,
104 bfd *, asection *, bfd_vma));
105 static bfd_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 bfd_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 bfd_boolean constructor_callback PARAMS ((struct bfd_link_info *,
115 bfd_boolean constructor,
117 bfd *, asection *, bfd_vma));
118 static bfd_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 bfd_boolean undefined_symbol PARAMS ((struct bfd_link_info *,
124 asection *, bfd_vma, bfd_boolean));
125 static bfd_boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
126 const char *, bfd_vma,
127 bfd *, asection *, bfd_vma));
128 static bfd_boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
129 bfd *, asection *, bfd_vma));
130 static bfd_boolean unattached_reloc PARAMS ((struct bfd_link_info *,
131 const char *, bfd *, asection *,
133 static bfd_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;
223 command_line.accept_unknown_input_arch = FALSE;
225 /* We initialize DEMANGLING based on the environment variable
226 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
227 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
228 environment. Acting the same way here lets us provide the same
229 interface by default. */
230 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
232 link_info.relocateable = FALSE;
233 link_info.emitrelocations = FALSE;
234 link_info.task_link = FALSE;
235 link_info.shared = FALSE;
236 link_info.symbolic = FALSE;
237 link_info.export_dynamic = FALSE;
238 link_info.static_link = FALSE;
239 link_info.traditional_format = FALSE;
240 link_info.optimize = FALSE;
241 link_info.no_undefined = FALSE;
242 link_info.allow_shlib_undefined = FALSE;
243 link_info.allow_multiple_definition = FALSE;
244 link_info.allow_undefined_version = TRUE;
245 link_info.keep_memory = TRUE;
246 link_info.notice_all = FALSE;
247 link_info.nocopyreloc = FALSE;
248 link_info.new_dtags = FALSE;
249 link_info.combreloc = TRUE;
250 link_info.eh_frame_hdr = FALSE;
251 link_info.strip_discarded = TRUE;
252 link_info.strip = strip_none;
253 link_info.discard = discard_sec_merge;
254 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
255 link_info.callbacks = &link_callbacks;
256 link_info.hash = NULL;
257 link_info.keep_hash = NULL;
258 link_info.notice_hash = NULL;
259 link_info.wrap_hash = NULL;
260 link_info.input_bfds = NULL;
261 link_info.create_object_symbols_section = NULL;
262 link_info.gc_sym_list = NULL;
263 link_info.base_file = NULL;
264 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
265 and _fini symbols. We are compatible. */
266 link_info.init_function = "_init";
267 link_info.fini_function = "_fini";
268 link_info.mpc860c0 = 0;
269 link_info.pei386_auto_import = -1;
270 link_info.pei386_runtime_pseudo_reloc = FALSE;
271 link_info.spare_dynamic_tags = 5;
272 link_info.flags = (bfd_vma) 0;
273 link_info.flags_1 = (bfd_vma) 0;
275 ldfile_add_arch ("");
277 config.make_executable = TRUE;
278 force_make_executable = FALSE;
279 config.magic_demand_paged = TRUE;
280 config.text_read_only = TRUE;
282 emulation = get_emulation (argc, argv);
283 ldemul_choose_mode (emulation);
284 default_target = ldemul_choose_target (argc, argv);
286 ldemul_before_parse ();
287 lang_has_input_file = FALSE;
288 parse_args (argc, argv);
290 ldemul_set_symbols ();
292 if (link_info.relocateable)
294 if (command_line.gc_sections)
295 einfo ("%P%F: --gc-sections and -r may not be used together\n");
296 if (link_info.mpc860c0)
297 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
298 else if (command_line.relax)
299 einfo (_("%P%F: --relax and -r may not be used together\n"));
300 if (link_info.shared)
301 einfo (_("%P%F: -r and -shared may not be used together\n"));
304 if (! link_info.shared)
306 if (command_line.filter_shlib)
307 einfo (_("%P%F: -F may not be used without -shared\n"));
308 if (command_line.auxiliary_filters)
309 einfo (_("%P%F: -f may not be used without -shared\n"));
312 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
313 don't see how else this can be handled, since in this case we
314 must preserve all externally visible symbols. */
315 if (link_info.relocateable && link_info.strip == strip_all)
317 link_info.strip = strip_debugger;
318 if (link_info.discard == discard_sec_merge)
319 link_info.discard = discard_all;
322 /* This essentially adds another -L directory so this must be done after
323 the -L's in argv have been processed. */
326 /* If we have not already opened and parsed a linker script
327 read the emulation's appropriate default script. */
328 if (saved_script_handle == NULL)
331 char *s = ldemul_get_script (&isfile);
334 ldfile_open_command_file (s);
340 parser_input = input_script;
345 if (trace_file_tries)
347 if (saved_script_handle)
348 info_msg (_("using external linker script:"));
350 info_msg (_("using internal linker script:"));
351 info_msg ("\n==================================================\n");
353 if (saved_script_handle)
355 static const int ld_bufsz = 8193;
357 char *buf = xmalloc (ld_bufsz);
359 rewind (saved_script_handle);
360 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
365 rewind (saved_script_handle);
372 info_msg (ldemul_get_script (&isfile));
375 info_msg ("\n==================================================\n");
380 if (!lang_has_input_file)
384 einfo (_("%P%F: no input files\n"));
389 info_msg (_("%P: mode %s\n"), emulation);
392 ldemul_after_parse ();
394 if (config.map_filename)
396 if (strcmp (config.map_filename, "-") == 0)
398 config.map_file = stdout;
402 config.map_file = fopen (config.map_filename, FOPEN_WT);
403 if (config.map_file == (FILE *) NULL)
405 bfd_set_error (bfd_error_system_call);
406 einfo (_("%P%F: cannot open map file %s: %E\n"),
407 config.map_filename);
414 /* Print error messages for any missing symbols, for any warning
415 symbols, and possibly multiple definitions. */
417 if (link_info.relocateable)
418 output_bfd->flags &= ~EXEC_P;
420 output_bfd->flags |= EXEC_P;
424 if (config.map_file != NULL)
426 if (command_line.cref)
427 output_cref (config.map_file != NULL ? config.map_file : stdout);
428 if (nocrossref_list != NULL)
429 check_nocrossrefs ();
431 /* Even if we're producing relocateable output, some non-fatal errors should
432 be reported in the exit status. (What non-fatal errors, if any, do we
433 want to ignore for relocateable output?) */
435 if (!config.make_executable && !force_make_executable)
439 einfo (_("%P: link errors found, deleting executable `%s'\n"),
443 /* The file will be removed by remove_output. */
449 if (! bfd_close (output_bfd))
450 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
452 /* If the --force-exe-suffix is enabled, and we're making an
453 executable file and it doesn't end in .exe, copy it to one
455 if (! link_info.relocateable && command_line.force_exe_suffix)
457 int len = strlen (output_filename);
459 || (strcasecmp (output_filename + len - 4, ".exe") != 0
460 && strcasecmp (output_filename + len - 4, ".dll") != 0))
464 const int bsize = 4096;
465 char *buf = xmalloc (bsize);
467 char *dst_name = xmalloc (len + 5);
468 strcpy (dst_name, output_filename);
469 strcat (dst_name, ".exe");
470 src = fopen (output_filename, FOPEN_RB);
471 dst = fopen (dst_name, FOPEN_WB);
474 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
476 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
477 while ((l = fread (buf, 1, bsize, src)) > 0)
479 int done = fwrite (buf, 1, l, dst);
482 einfo (_("%P: Error writing file `%s'\n"), dst_name);
486 if (fclose (dst) == EOF)
488 einfo (_("%P: Error closing file `%s'\n"), dst_name);
496 END_PROGRESS (program_name);
501 char *lim = (char *) sbrk (0);
503 long run_time = get_run_time () - start_time;
505 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
506 program_name, run_time / 1000000, run_time % 1000000);
508 fprintf (stderr, _("%s: data size %ld\n"), program_name,
509 (long) (lim - (char *) &environ));
513 /* Prevent remove_output from doing anything, after a successful link. */
514 output_filename = NULL;
520 /* We need to find any explicitly given emulation in order to initialize the
521 state that's needed by the lex&yacc argument parser (parse_args). */
524 get_emulation (argc, argv)
531 emulation = getenv (EMULATION_ENVIRON);
532 if (emulation == NULL)
533 emulation = DEFAULT_EMULATION;
535 for (i = 1; i < argc; i++)
537 if (!strncmp (argv[i], "-m", 2))
539 if (argv[i][2] == '\0')
544 emulation = argv[i + 1];
549 einfo (_("%P%F: missing argument to -m\n"));
552 else if (strcmp (argv[i], "-mips1") == 0
553 || strcmp (argv[i], "-mips2") == 0
554 || strcmp (argv[i], "-mips3") == 0
555 || strcmp (argv[i], "-mips32") == 0
556 || strcmp (argv[i], "-mips64") == 0
557 || strcmp (argv[i], "-mips4") == 0
558 || strcmp (argv[i], "-mips5") == 0)
560 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
561 passed to the linker by some MIPS compilers. They
562 generally tell the linker to use a slightly different
563 library path. Perhaps someday these should be
564 implemented as emulations; until then, we just ignore
565 the arguments and hope that nobody ever creates
566 emulations named ips1, ips2 or ips3. */
568 else if (strcmp (argv[i], "-m486") == 0)
570 /* FIXME: The argument -m486 is passed to the linker on
571 some Linux systems. Hope that nobody creates an
572 emulation named 486. */
577 emulation = &argv[i][2];
585 /* If directory DIR contains an "ldscripts" subdirectory,
586 add DIR to the library search path and return TRUE,
587 else return FALSE. */
590 check_for_scripts_dir (dir)
598 dirlen = strlen (dir);
599 /* sizeof counts the terminating NUL. */
600 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
601 sprintf (buf, "%s/ldscripts", dir);
603 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
606 ldfile_add_library_path (dir, FALSE);
610 /* Set the default directory for finding script files.
611 Libraries will be searched for here too, but that's ok.
612 We look for the "ldscripts" directory in:
614 SCRIPTDIR (passed from Makefile)
615 the dir where this program is (for using it from the build tree)
616 the dir where this program is/../lib (for installing the tool suite elsewhere) */
624 if (check_for_scripts_dir (SCRIPTDIR))
625 /* We've been installed normally. */
628 /* Look for "ldscripts" in the dir where our binary is. */
629 end = strrchr (program_name, '/');
630 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
632 /* We could have \foo\bar, or /foo\bar. */
633 char *bslash = strrchr (program_name, '\\');
634 if (end == NULL || (bslash != NULL && bslash > end))
641 /* Don't look for ldscripts in the current directory. There is
642 too much potential for confusion. */
646 dirlen = end - program_name;
647 /* Make a copy of program_name in dir.
648 Leave room for later "/../lib". */
649 dir = (char *) xmalloc (dirlen + 8);
650 strncpy (dir, program_name, dirlen);
653 if (check_for_scripts_dir (dir))
654 /* Don't free dir. */
657 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
658 strcpy (dir + dirlen, "/../lib");
659 if (check_for_scripts_dir (dir))
662 /* Well, we tried. */
670 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
672 link_info.notice_hash = ((struct bfd_hash_table *)
673 xmalloc (sizeof (struct bfd_hash_table)));
674 if (! bfd_hash_table_init_n (link_info.notice_hash,
677 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
680 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE)
681 == (struct bfd_hash_entry *) NULL)
682 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
685 /* Record a symbol to be wrapped, from the --wrap option. */
691 if (link_info.wrap_hash == NULL)
693 link_info.wrap_hash = ((struct bfd_hash_table *)
694 xmalloc (sizeof (struct bfd_hash_table)));
695 if (! bfd_hash_table_init_n (link_info.wrap_hash,
698 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
700 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
701 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
704 /* Handle the -retain-symbols-file option. */
707 add_keepsyms_file (filename)
708 const char *filename;
715 if (link_info.strip == strip_some)
716 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
718 file = fopen (filename, "r");
719 if (file == (FILE *) NULL)
721 bfd_set_error (bfd_error_system_call);
722 einfo ("%X%P: %s: %E\n", filename);
726 link_info.keep_hash = ((struct bfd_hash_table *)
727 xmalloc (sizeof (struct bfd_hash_table)));
728 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
729 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
732 buf = (char *) xmalloc (bufsize);
744 while (! ISSPACE (c) && c != EOF)
751 buf = xrealloc (buf, bufsize);
758 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE)
759 == (struct bfd_hash_entry *) NULL)
760 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
764 if (link_info.strip != strip_none)
765 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
767 link_info.strip = strip_some;
770 /* Callbacks from the BFD linker routines. */
772 /* This is called when BFD has decided to include an archive member in
776 add_archive_element (info, abfd, name)
777 struct bfd_link_info *info ATTRIBUTE_UNUSED;
781 lang_input_statement_type *input;
783 input = ((lang_input_statement_type *)
784 xmalloc (sizeof (lang_input_statement_type)));
785 input->filename = abfd->filename;
786 input->local_sym_name = abfd->filename;
787 input->the_bfd = abfd;
788 input->asymbols = NULL;
790 input->just_syms_flag = FALSE;
791 input->loaded = FALSE;
792 input->search_dirs_flag = FALSE;
794 /* FIXME: The following fields are not set: header.next,
795 header.type, closed, passive_position, symbol_count,
796 next_real_file, is_archive, target, real. This bit of code is
797 from the old decode_library_subfile function. I don't know
798 whether any of those fields matters. */
800 ldlang_add_file (input);
802 if (config.map_file != (FILE *) NULL)
804 static bfd_boolean header_printed;
805 struct bfd_link_hash_entry *h;
809 h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE);
821 case bfd_link_hash_defined:
822 case bfd_link_hash_defweak:
823 from = h->u.def.section->owner;
826 case bfd_link_hash_undefined:
827 case bfd_link_hash_undefweak:
828 from = h->u.undef.abfd;
831 case bfd_link_hash_common:
832 from = h->u.c.p->section->owner;
837 if (! header_printed)
841 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
843 header_printed = TRUE;
846 if (bfd_my_archive (abfd) == NULL)
848 minfo ("%s", bfd_get_filename (abfd));
849 len = strlen (bfd_get_filename (abfd));
853 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
854 bfd_get_filename (abfd));
855 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
856 + strlen (bfd_get_filename (abfd))
874 minfo ("(%T)\n", h->root.string);
876 minfo ("(%s)\n", name);
879 if (trace_files || trace_file_tries)
880 info_msg ("%I\n", input);
885 /* This is called when BFD has discovered a symbol which is defined
889 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
890 struct bfd_link_info *info ATTRIBUTE_UNUSED;
899 /* If either section has the output_section field set to
900 bfd_abs_section_ptr, it means that the section is being
901 discarded, and this is not really a multiple definition at all.
902 FIXME: It would be cleaner to somehow ignore symbols defined in
903 sections which are being discarded. */
904 if ((osec->output_section != NULL
905 && ! bfd_is_abs_section (osec)
906 && bfd_is_abs_section (osec->output_section))
907 || (nsec->output_section != NULL
908 && ! bfd_is_abs_section (nsec)
909 && bfd_is_abs_section (nsec->output_section)))
912 einfo (_("%X%C: multiple definition of `%T'\n"),
913 nbfd, nsec, nval, name);
914 if (obfd != (bfd *) NULL)
915 einfo (_("%D: first defined here\n"), obfd, osec, oval);
917 if (command_line.relax)
919 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
920 command_line.relax = 0;
926 /* This is called when there is a definition of a common symbol, or
927 when a common symbol is found for a symbol that is already defined,
928 or when two common symbols are found. We only do something if
929 -warn-common was used. */
932 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
933 struct bfd_link_info *info ATTRIBUTE_UNUSED;
936 enum bfd_link_hash_type otype;
939 enum bfd_link_hash_type ntype;
942 if (! config.warn_common)
945 if (ntype == bfd_link_hash_defined
946 || ntype == bfd_link_hash_defweak
947 || ntype == bfd_link_hash_indirect)
949 ASSERT (otype == bfd_link_hash_common);
950 einfo (_("%B: warning: definition of `%T' overriding common\n"),
953 einfo (_("%B: warning: common is here\n"), obfd);
955 else if (otype == bfd_link_hash_defined
956 || otype == bfd_link_hash_defweak
957 || otype == bfd_link_hash_indirect)
959 ASSERT (ntype == bfd_link_hash_common);
960 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
963 einfo (_("%B: warning: defined here\n"), obfd);
967 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
970 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
973 einfo (_("%B: warning: larger common is here\n"), obfd);
975 else if (nsize > osize)
977 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
980 einfo (_("%B: warning: smaller common is here\n"), obfd);
984 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
986 einfo (_("%B: warning: previous common is here\n"), obfd);
993 /* This is called when BFD has discovered a set element. H is the
994 entry in the linker hash table for the set. SECTION and VALUE
995 represent a value which should be added to the set. */
998 add_to_set (info, h, reloc, abfd, section, value)
999 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1000 struct bfd_link_hash_entry *h;
1001 bfd_reloc_code_real_type reloc;
1006 if (config.warn_constructors)
1007 einfo (_("%P: warning: global constructor %s used\n"),
1010 if (! config.build_constructors)
1013 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1015 if (h->type == bfd_link_hash_new)
1017 h->type = bfd_link_hash_undefined;
1018 h->u.undef.abfd = abfd;
1019 /* We don't call bfd_link_add_undef to add this to the list of
1020 undefined symbols because we are going to define it
1027 /* This is called when BFD has discovered a constructor. This is only
1028 called for some object file formats--those which do not handle
1029 constructors in some more clever fashion. This is similar to
1030 adding an element to a set, but less general. */
1033 constructor_callback (info, constructor, name, abfd, section, value)
1034 struct bfd_link_info *info;
1035 bfd_boolean constructor;
1042 struct bfd_link_hash_entry *h;
1043 char set_name[1 + sizeof "__CTOR_LIST__"];
1045 if (config.warn_constructors)
1046 einfo (_("%P: warning: global constructor %s used\n"), name);
1048 if (! config.build_constructors)
1051 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1052 useful error message. */
1053 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1054 && (link_info.relocateable
1055 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1056 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1059 if (bfd_get_symbol_leading_char (abfd) != '\0')
1060 *s++ = bfd_get_symbol_leading_char (abfd);
1062 strcpy (s, "__CTOR_LIST__");
1064 strcpy (s, "__DTOR_LIST__");
1066 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1067 if (h == (struct bfd_link_hash_entry *) NULL)
1068 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1069 if (h->type == bfd_link_hash_new)
1071 h->type = bfd_link_hash_undefined;
1072 h->u.undef.abfd = abfd;
1073 /* We don't call bfd_link_add_undef to add this to the list of
1074 undefined symbols because we are going to define it
1078 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1082 /* A structure used by warning_callback to pass information through
1083 bfd_map_over_sections. */
1085 struct warning_callback_info {
1087 const char *warning;
1092 /* This is called when there is a reference to a warning symbol. */
1095 warning_callback (info, warning, symbol, abfd, section, address)
1096 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1097 const char *warning;
1103 /* This is a hack to support warn_multiple_gp. FIXME: This should
1104 have a cleaner interface, but what? */
1105 if (! config.warn_multiple_gp
1106 && strcmp (warning, "using multiple gp values") == 0)
1109 if (section != NULL)
1110 einfo ("%C: %s\n", abfd, section, address, warning);
1111 else if (abfd == NULL)
1112 einfo ("%P: %s\n", warning);
1113 else if (symbol == NULL)
1114 einfo ("%B: %s\n", abfd, warning);
1117 lang_input_statement_type *entry;
1119 struct warning_callback_info info;
1121 /* Look through the relocs to see if we can find a plausible
1124 entry = (lang_input_statement_type *) abfd->usrdata;
1125 if (entry != NULL && entry->asymbols != NULL)
1126 asymbols = entry->asymbols;
1132 symsize = bfd_get_symtab_upper_bound (abfd);
1134 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1135 asymbols = (asymbol **) xmalloc (symsize);
1136 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1137 if (symbol_count < 0)
1138 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1141 entry->asymbols = asymbols;
1142 entry->symbol_count = symbol_count;
1147 info.warning = warning;
1148 info.symbol = symbol;
1149 info.asymbols = asymbols;
1150 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1153 einfo ("%B: %s\n", abfd, warning);
1162 /* This is called by warning_callback for each section. It checks the
1163 relocs of the section to see if it can find a reference to the
1164 symbol which triggered the warning. If it can, it uses the reloc
1165 to give an error message with a file and line number. */
1168 warning_find_reloc (abfd, sec, iarg)
1173 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1177 arelent **p, **pend;
1182 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1184 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1188 relpp = (arelent **) xmalloc (relsize);
1189 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1191 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1194 pend = p + relcount;
1195 for (; p < pend && *p != NULL; p++)
1199 if (q->sym_ptr_ptr != NULL
1200 && *q->sym_ptr_ptr != NULL
1201 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1203 /* We found a reloc for the symbol we are looking for. */
1204 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1213 /* This is called when an undefined symbol is found. */
1216 undefined_symbol (info, name, abfd, section, address, fatal)
1217 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1222 bfd_boolean fatal ATTRIBUTE_UNUSED;
1224 static char *error_name;
1225 static unsigned int error_count;
1227 #define MAX_ERRORS_IN_A_ROW 5
1229 if (config.warn_once)
1231 static struct bfd_hash_table *hash;
1233 /* Only warn once about a particular undefined symbol. */
1237 hash = ((struct bfd_hash_table *)
1238 xmalloc (sizeof (struct bfd_hash_table)));
1239 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1240 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1243 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1246 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1247 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1250 /* We never print more than a reasonable number of errors in a row
1251 for a single symbol. */
1252 if (error_name != (char *) NULL
1253 && strcmp (name, error_name) == 0)
1258 if (error_name != (char *) NULL)
1260 error_name = xstrdup (name);
1263 if (section != NULL)
1265 if (error_count < MAX_ERRORS_IN_A_ROW)
1267 einfo (_("%C: undefined reference to `%T'\n"),
1268 abfd, section, address, name);
1272 else if (error_count == MAX_ERRORS_IN_A_ROW)
1273 einfo (_("%D: more undefined references to `%T' follow\n"),
1274 abfd, section, address, name);
1278 if (error_count < MAX_ERRORS_IN_A_ROW)
1280 einfo (_("%B: undefined reference to `%T'\n"),
1285 else if (error_count == MAX_ERRORS_IN_A_ROW)
1286 einfo (_("%B: more undefined references to `%T' follow\n"),
1293 /* This is called when a reloc overflows. */
1296 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1297 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1299 const char *reloc_name;
1305 if (abfd == (bfd *) NULL)
1306 einfo (_("%P%X: generated"));
1308 einfo ("%X%C:", abfd, section, address);
1309 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1311 einfo ("+%v", addend);
1316 /* This is called when a dangerous relocation is made. */
1319 reloc_dangerous (info, message, abfd, section, address)
1320 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1321 const char *message;
1326 if (abfd == (bfd *) NULL)
1327 einfo (_("%P%X: generated"));
1329 einfo ("%X%C:", abfd, section, address);
1330 einfo (_("dangerous relocation: %s\n"), message);
1334 /* This is called when a reloc is being generated attached to a symbol
1335 that is not being output. */
1338 unattached_reloc (info, name, abfd, section, address)
1339 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1345 if (abfd == (bfd *) NULL)
1346 einfo (_("%P%X: generated"));
1348 einfo ("%X%C:", abfd, section, address);
1349 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1353 /* This is called if link_info.notice_all is set, or when a symbol in
1354 link_info.notice_hash is found. Symbols are put in notice_hash
1355 using the -y option. */
1358 notice (info, name, abfd, section, value)
1359 struct bfd_link_info *info;
1365 if (! info->notice_all
1366 || (info->notice_hash != NULL
1367 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1369 if (bfd_is_und_section (section))
1370 einfo ("%B: reference to %s\n", abfd, name);
1372 einfo ("%B: definition of %s\n", abfd, name);
1375 if (command_line.cref || nocrossref_list != NULL)
1376 add_cref (name, abfd, section, value);