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 #ifndef TARGET_SYSTEM_ROOT
59 #define TARGET_SYSTEM_ROOT ""
65 const char *output_filename = "a.out";
67 /* Name this program was invoked by. */
70 /* The prefix for system library directories. */
73 /* The canonical representation of ld_sysroot. */
74 char * ld_canon_sysroot;
75 int ld_canon_sysroot_len;
77 /* The file that we're creating. */
80 /* Set by -G argument, for MIPS ECOFF target. */
81 int g_switch_value = 8;
83 /* Nonzero means print names of input files as processed. */
84 bfd_boolean trace_files;
86 /* Nonzero means same, but note open failures, too. */
87 bfd_boolean trace_file_tries;
89 /* Nonzero means version number was printed, so exit successfully
90 instead of complaining if no input files are given. */
91 bfd_boolean version_printed;
93 /* Nonzero means link in every member of an archive. */
94 bfd_boolean whole_archive;
96 /* Nonzero means create DT_NEEDED entries only if a dynamic library
97 actually satisfies some reference in a regular object. */
98 bfd_boolean as_needed;
100 /* Nonzero means never create DT_NEEDED entries for dynamic libraries
101 in DT_NEEDED tags. */
102 bfd_boolean add_needed = TRUE;
104 /* TRUE if we should demangle symbol names. */
105 bfd_boolean demangling;
107 args_type command_line;
109 ld_config_type config;
111 sort_type sort_section;
113 static char *get_emulation
115 static void set_scripts_dir
117 static bfd_boolean add_archive_element
118 (struct bfd_link_info *, bfd *, const char *);
119 static bfd_boolean multiple_definition
120 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
121 bfd *, asection *, bfd_vma);
122 static bfd_boolean multiple_common
123 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
124 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
125 static bfd_boolean add_to_set
126 (struct bfd_link_info *, struct bfd_link_hash_entry *,
127 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
128 static bfd_boolean constructor_callback
129 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
130 asection *, bfd_vma);
131 static bfd_boolean warning_callback
132 (struct bfd_link_info *, const char *, const char *, bfd *,
133 asection *, bfd_vma);
134 static void warning_find_reloc
135 (bfd *, asection *, void *);
136 static bfd_boolean undefined_symbol
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
139 static bfd_boolean reloc_overflow
140 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
141 const char *, bfd_vma, bfd *, asection *, bfd_vma);
142 static bfd_boolean reloc_dangerous
143 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
144 static bfd_boolean unattached_reloc
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean notice
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
149 static struct bfd_link_callbacks link_callbacks =
155 constructor_callback,
164 struct bfd_link_info link_info;
172 bfd_cache_close (output_bfd);
173 if (delete_output_file_on_failure)
174 unlink (output_filename);
179 main (int argc, char **argv)
182 long start_time = get_run_time ();
184 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
185 setlocale (LC_MESSAGES, "");
187 #if defined (HAVE_SETLOCALE)
188 setlocale (LC_CTYPE, "");
190 bindtextdomain (PACKAGE, LOCALEDIR);
191 textdomain (PACKAGE);
193 program_name = argv[0];
194 xmalloc_set_program_name (program_name);
196 START_PROGRESS (program_name, 0);
200 bfd_set_error_program_name (program_name);
202 xatexit (remove_output);
204 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
205 ld_sysroot = make_relative_prefix (program_name, BINDIR,
211 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
222 ld_sysroot = make_relative_prefix (program_name, TOOLBINDIR,
228 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
240 ld_sysroot = TARGET_SYSTEM_ROOT;
242 if (ld_sysroot && *ld_sysroot)
243 ld_canon_sysroot = lrealpath (ld_sysroot);
245 if (ld_canon_sysroot)
246 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
248 ld_canon_sysroot_len = -1;
250 /* Set the default BFD target based on the configured target. Doing
251 this permits the linker to be configured for a particular target,
252 and linked against a shared BFD library which was configured for
253 a different target. The macro TARGET is defined by Makefile. */
254 if (! bfd_set_default_target (TARGET))
256 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
267 /* Initialize the data about options. */
268 trace_files = trace_file_tries = version_printed = FALSE;
269 whole_archive = FALSE;
270 config.build_constructors = TRUE;
271 config.dynamic_link = FALSE;
272 config.has_shared = FALSE;
273 config.split_by_reloc = (unsigned) -1;
274 config.split_by_file = (bfd_size_type) -1;
275 config.hash_table_size = 0;
276 command_line.force_common_definition = FALSE;
277 command_line.inhibit_common_definition = FALSE;
278 command_line.interpreter = NULL;
279 command_line.rpath = NULL;
280 command_line.warn_mismatch = TRUE;
281 command_line.check_section_addresses = TRUE;
282 command_line.accept_unknown_input_arch = FALSE;
283 command_line.reduce_memory_overheads = FALSE;
287 /* We initialize DEMANGLING based on the environment variable
288 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
289 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
290 environment. Acting the same way here lets us provide the same
291 interface by default. */
292 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
294 link_info.relocatable = FALSE;
295 link_info.emitrelocations = FALSE;
296 link_info.task_link = FALSE;
297 link_info.shared = FALSE;
298 link_info.pie = FALSE;
299 link_info.executable = FALSE;
300 link_info.symbolic = FALSE;
301 link_info.export_dynamic = FALSE;
302 link_info.static_link = FALSE;
303 link_info.traditional_format = FALSE;
304 link_info.optimize = FALSE;
305 link_info.unresolved_syms_in_objects = RM_NOT_YET_SET;
306 link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET;
307 link_info.allow_multiple_definition = FALSE;
308 link_info.allow_undefined_version = TRUE;
309 link_info.create_default_symver = FALSE;
310 link_info.default_imported_symver = FALSE;
311 link_info.keep_memory = TRUE;
312 link_info.notice_all = FALSE;
313 link_info.nocopyreloc = FALSE;
314 link_info.new_dtags = FALSE;
315 link_info.combreloc = TRUE;
316 link_info.eh_frame_hdr = FALSE;
317 link_info.relro = FALSE;
318 link_info.strip_discarded = TRUE;
319 link_info.strip = strip_none;
320 link_info.discard = discard_sec_merge;
321 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
322 link_info.callbacks = &link_callbacks;
323 link_info.hash = NULL;
324 link_info.keep_hash = NULL;
325 link_info.notice_hash = NULL;
326 link_info.wrap_hash = NULL;
327 link_info.input_bfds = NULL;
328 link_info.create_object_symbols_section = NULL;
329 link_info.gc_sym_list = NULL;
330 link_info.base_file = NULL;
331 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
332 and _fini symbols. We are compatible. */
333 link_info.init_function = "_init";
334 link_info.fini_function = "_fini";
335 link_info.pei386_auto_import = -1;
336 link_info.pei386_runtime_pseudo_reloc = FALSE;
337 link_info.spare_dynamic_tags = 5;
339 link_info.flags_1 = 0;
340 link_info.need_relax_finalize = FALSE;
341 link_info.warn_shared_textrel = FALSE;
343 ldfile_add_arch ("");
345 config.make_executable = TRUE;
346 force_make_executable = FALSE;
347 config.magic_demand_paged = TRUE;
348 config.text_read_only = TRUE;
350 emulation = get_emulation (argc, argv);
351 ldemul_choose_mode (emulation);
352 default_target = ldemul_choose_target (argc, argv);
354 ldemul_before_parse ();
355 lang_has_input_file = FALSE;
356 parse_args (argc, argv);
358 if (config.hash_table_size != 0)
359 bfd_hash_set_default_size (config.hash_table_size);
361 ldemul_set_symbols ();
363 if (link_info.relocatable)
365 if (command_line.gc_sections)
366 einfo ("%P%F: --gc-sections and -r may not be used together\n");
367 else if (command_line.relax)
368 einfo (_("%P%F: --relax and -r may not be used together\n"));
369 if (link_info.shared)
370 einfo (_("%P%F: -r and -shared may not be used together\n"));
373 if (! link_info.shared)
375 if (command_line.filter_shlib)
376 einfo (_("%P%F: -F may not be used without -shared\n"));
377 if (command_line.auxiliary_filters)
378 einfo (_("%P%F: -f may not be used without -shared\n"));
381 if (! link_info.shared || link_info.pie)
382 link_info.executable = TRUE;
384 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
385 don't see how else this can be handled, since in this case we
386 must preserve all externally visible symbols. */
387 if (link_info.relocatable && link_info.strip == strip_all)
389 link_info.strip = strip_debugger;
390 if (link_info.discard == discard_sec_merge)
391 link_info.discard = discard_all;
394 /* This essentially adds another -L directory so this must be done after
395 the -L's in argv have been processed. */
398 /* If we have not already opened and parsed a linker script
399 read the emulation's appropriate default script. */
400 if (saved_script_handle == NULL)
403 char *s = ldemul_get_script (&isfile);
406 ldfile_open_command_file (s);
412 parser_input = input_script;
417 if (trace_file_tries)
419 if (saved_script_handle)
420 info_msg (_("using external linker script:"));
422 info_msg (_("using internal linker script:"));
423 info_msg ("\n==================================================\n");
425 if (saved_script_handle)
427 static const int ld_bufsz = 8193;
429 char *buf = xmalloc (ld_bufsz);
431 rewind (saved_script_handle);
432 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
437 rewind (saved_script_handle);
444 info_msg (ldemul_get_script (&isfile));
447 info_msg ("\n==================================================\n");
452 if (!lang_has_input_file)
456 einfo (_("%P%F: no input files\n"));
460 info_msg (_("%P: mode %s\n"), emulation);
462 ldemul_after_parse ();
464 if (config.map_filename)
466 if (strcmp (config.map_filename, "-") == 0)
468 config.map_file = stdout;
472 config.map_file = fopen (config.map_filename, FOPEN_WT);
473 if (config.map_file == (FILE *) NULL)
475 bfd_set_error (bfd_error_system_call);
476 einfo (_("%P%F: cannot open map file %s: %E\n"),
477 config.map_filename);
484 /* Print error messages for any missing symbols, for any warning
485 symbols, and possibly multiple definitions. */
486 if (link_info.relocatable)
487 output_bfd->flags &= ~EXEC_P;
489 output_bfd->flags |= EXEC_P;
493 if (config.map_file != NULL)
495 if (command_line.cref)
496 output_cref (config.map_file != NULL ? config.map_file : stdout);
497 if (nocrossref_list != NULL)
498 check_nocrossrefs ();
500 /* Even if we're producing relocatable output, some non-fatal errors should
501 be reported in the exit status. (What non-fatal errors, if any, do we
502 want to ignore for relocatable output?) */
503 if (!config.make_executable && !force_make_executable)
506 einfo (_("%P: link errors found, deleting executable `%s'\n"),
509 /* The file will be removed by remove_output. */
514 if (! bfd_close (output_bfd))
515 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
517 /* If the --force-exe-suffix is enabled, and we're making an
518 executable file and it doesn't end in .exe, copy it to one
520 if (! link_info.relocatable && command_line.force_exe_suffix)
522 int len = strlen (output_filename);
525 || (strcasecmp (output_filename + len - 4, ".exe") != 0
526 && strcasecmp (output_filename + len - 4, ".dll") != 0))
530 const int bsize = 4096;
531 char *buf = xmalloc (bsize);
533 char *dst_name = xmalloc (len + 5);
535 strcpy (dst_name, output_filename);
536 strcat (dst_name, ".exe");
537 src = fopen (output_filename, FOPEN_RB);
538 dst = fopen (dst_name, FOPEN_WB);
541 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
544 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
546 while ((l = fread (buf, 1, bsize, src)) > 0)
548 int done = fwrite (buf, 1, l, dst);
551 einfo (_("%P: Error writing file `%s'\n"), dst_name);
555 if (fclose (dst) == EOF)
556 einfo (_("%P: Error closing file `%s'\n"), dst_name);
563 END_PROGRESS (program_name);
568 char *lim = sbrk (0);
570 long run_time = get_run_time () - start_time;
572 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
573 program_name, run_time / 1000000, run_time % 1000000);
575 fprintf (stderr, _("%s: data size %ld\n"), program_name,
576 (long) (lim - (char *) &environ));
580 /* Prevent remove_output from doing anything, after a successful link. */
581 output_filename = NULL;
587 /* We need to find any explicitly given emulation in order to initialize the
588 state that's needed by the lex&yacc argument parser (parse_args). */
591 get_emulation (int argc, char **argv)
596 emulation = getenv (EMULATION_ENVIRON);
597 if (emulation == NULL)
598 emulation = DEFAULT_EMULATION;
600 for (i = 1; i < argc; i++)
602 if (!strncmp (argv[i], "-m", 2))
604 if (argv[i][2] == '\0')
609 emulation = argv[i + 1];
613 einfo (_("%P%F: missing argument to -m\n"));
615 else if (strcmp (argv[i], "-mips1") == 0
616 || strcmp (argv[i], "-mips2") == 0
617 || strcmp (argv[i], "-mips3") == 0
618 || strcmp (argv[i], "-mips4") == 0
619 || strcmp (argv[i], "-mips5") == 0
620 || strcmp (argv[i], "-mips32") == 0
621 || strcmp (argv[i], "-mips32r2") == 0
622 || strcmp (argv[i], "-mips64") == 0
623 || strcmp (argv[i], "-mips64r2") == 0)
625 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
626 passed to the linker by some MIPS compilers. They
627 generally tell the linker to use a slightly different
628 library path. Perhaps someday these should be
629 implemented as emulations; until then, we just ignore
630 the arguments and hope that nobody ever creates
631 emulations named ips1, ips2 or ips3. */
633 else if (strcmp (argv[i], "-m486") == 0)
635 /* FIXME: The argument -m486 is passed to the linker on
636 some Linux systems. Hope that nobody creates an
637 emulation named 486. */
642 emulation = &argv[i][2];
650 /* If directory DIR contains an "ldscripts" subdirectory,
651 add DIR to the library search path and return TRUE,
652 else return FALSE. */
655 check_for_scripts_dir (char *dir)
662 dirlen = strlen (dir);
663 /* sizeof counts the terminating NUL. */
664 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
665 sprintf (buf, "%s/ldscripts", dir);
667 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
670 ldfile_add_library_path (dir, FALSE);
674 /* Set the default directory for finding script files.
675 Libraries will be searched for here too, but that's ok.
676 We look for the "ldscripts" directory in:
678 SCRIPTDIR (passed from Makefile)
679 (adjusted according to the current location of the binary)
680 SCRIPTDIR (passed from Makefile)
681 the dir where this program is (for using it from the build tree)
682 the dir where this program is/../lib
683 (for installing the tool suite elsewhere). */
686 set_scripts_dir (void)
692 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
695 found = check_for_scripts_dir (dir);
701 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
704 found = check_for_scripts_dir (dir);
710 if (check_for_scripts_dir (SCRIPTDIR))
711 /* We've been installed normally. */
714 /* Look for "ldscripts" in the dir where our binary is. */
715 end = strrchr (program_name, '/');
716 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
718 /* We could have \foo\bar, or /foo\bar. */
719 char *bslash = strrchr (program_name, '\\');
721 if (end == NULL || (bslash != NULL && bslash > end))
727 /* Don't look for ldscripts in the current directory. There is
728 too much potential for confusion. */
731 dirlen = end - program_name;
732 /* Make a copy of program_name in dir.
733 Leave room for later "/../lib". */
734 dir = xmalloc (dirlen + 8);
735 strncpy (dir, program_name, dirlen);
738 if (check_for_scripts_dir (dir))
744 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
745 strcpy (dir + dirlen, "/../lib");
746 check_for_scripts_dir (dir);
751 add_ysym (const char *name)
753 if (link_info.notice_hash == NULL)
755 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
756 if (! bfd_hash_table_init_n (link_info.notice_hash,
759 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
762 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
763 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
766 /* Record a symbol to be wrapped, from the --wrap option. */
769 add_wrap (const char *name)
771 if (link_info.wrap_hash == NULL)
773 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
774 if (! bfd_hash_table_init_n (link_info.wrap_hash,
777 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
780 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
781 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
784 /* Handle the -retain-symbols-file option. */
787 add_keepsyms_file (const char *filename)
794 if (link_info.strip == strip_some)
795 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
797 file = fopen (filename, "r");
800 bfd_set_error (bfd_error_system_call);
801 einfo ("%X%P: %s: %E\n", filename);
805 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
806 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
807 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
810 buf = xmalloc (bufsize);
822 while (! ISSPACE (c) && c != EOF)
829 buf = xrealloc (buf, bufsize);
836 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
837 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
841 if (link_info.strip != strip_none)
842 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
845 link_info.strip = strip_some;
848 /* Callbacks from the BFD linker routines. */
850 /* This is called when BFD has decided to include an archive member in
854 add_archive_element (struct bfd_link_info *info ATTRIBUTE_UNUSED,
858 lang_input_statement_type *input;
860 input = xmalloc (sizeof (lang_input_statement_type));
861 input->filename = abfd->filename;
862 input->local_sym_name = abfd->filename;
863 input->the_bfd = abfd;
864 input->asymbols = NULL;
866 input->just_syms_flag = FALSE;
867 input->loaded = FALSE;
868 input->search_dirs_flag = FALSE;
870 /* FIXME: The following fields are not set: header.next,
871 header.type, closed, passive_position, symbol_count,
872 next_real_file, is_archive, target, real. This bit of code is
873 from the old decode_library_subfile function. I don't know
874 whether any of those fields matters. */
876 ldlang_add_file (input);
878 if (config.map_file != NULL)
880 static bfd_boolean header_printed;
881 struct bfd_link_hash_entry *h;
885 h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE);
897 case bfd_link_hash_defined:
898 case bfd_link_hash_defweak:
899 from = h->u.def.section->owner;
902 case bfd_link_hash_undefined:
903 case bfd_link_hash_undefweak:
904 from = h->u.undef.abfd;
907 case bfd_link_hash_common:
908 from = h->u.c.p->section->owner;
913 if (! header_printed)
917 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
919 header_printed = TRUE;
922 if (bfd_my_archive (abfd) == NULL)
924 minfo ("%s", bfd_get_filename (abfd));
925 len = strlen (bfd_get_filename (abfd));
929 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
930 bfd_get_filename (abfd));
931 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
932 + strlen (bfd_get_filename (abfd))
950 minfo ("(%T)\n", h->root.string);
952 minfo ("(%s)\n", name);
955 if (trace_files || trace_file_tries)
956 info_msg ("%I\n", input);
961 /* This is called when BFD has discovered a symbol which is defined
965 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
974 /* If either section has the output_section field set to
975 bfd_abs_section_ptr, it means that the section is being
976 discarded, and this is not really a multiple definition at all.
977 FIXME: It would be cleaner to somehow ignore symbols defined in
978 sections which are being discarded. */
979 if ((osec->output_section != NULL
980 && ! bfd_is_abs_section (osec)
981 && bfd_is_abs_section (osec->output_section))
982 || (nsec->output_section != NULL
983 && ! bfd_is_abs_section (nsec)
984 && bfd_is_abs_section (nsec->output_section)))
987 einfo (_("%X%C: multiple definition of `%T'\n"),
988 nbfd, nsec, nval, name);
990 einfo (_("%D: first defined here\n"), obfd, osec, oval);
992 if (command_line.relax)
994 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
995 command_line.relax = 0;
1001 /* This is called when there is a definition of a common symbol, or
1002 when a common symbol is found for a symbol that is already defined,
1003 or when two common symbols are found. We only do something if
1004 -warn-common was used. */
1007 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1010 enum bfd_link_hash_type otype,
1013 enum bfd_link_hash_type ntype,
1016 if (! config.warn_common)
1019 if (ntype == bfd_link_hash_defined
1020 || ntype == bfd_link_hash_defweak
1021 || ntype == bfd_link_hash_indirect)
1023 ASSERT (otype == bfd_link_hash_common);
1024 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1027 einfo (_("%B: warning: common is here\n"), obfd);
1029 else if (otype == bfd_link_hash_defined
1030 || otype == bfd_link_hash_defweak
1031 || otype == bfd_link_hash_indirect)
1033 ASSERT (ntype == bfd_link_hash_common);
1034 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1037 einfo (_("%B: warning: defined here\n"), obfd);
1041 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1044 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1047 einfo (_("%B: warning: larger common is here\n"), obfd);
1049 else if (nsize > osize)
1051 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1054 einfo (_("%B: warning: smaller common is here\n"), obfd);
1058 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1060 einfo (_("%B: warning: previous common is here\n"), obfd);
1067 /* This is called when BFD has discovered a set element. H is the
1068 entry in the linker hash table for the set. SECTION and VALUE
1069 represent a value which should be added to the set. */
1072 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1073 struct bfd_link_hash_entry *h,
1074 bfd_reloc_code_real_type reloc,
1079 if (config.warn_constructors)
1080 einfo (_("%P: warning: global constructor %s used\n"),
1083 if (! config.build_constructors)
1086 ldctor_add_set_entry (h, reloc, NULL, section, value);
1088 if (h->type == bfd_link_hash_new)
1090 h->type = bfd_link_hash_undefined;
1091 h->u.undef.abfd = abfd;
1092 /* We don't call bfd_link_add_undef to add this to the list of
1093 undefined symbols because we are going to define it
1100 /* This is called when BFD has discovered a constructor. This is only
1101 called for some object file formats--those which do not handle
1102 constructors in some more clever fashion. This is similar to
1103 adding an element to a set, but less general. */
1106 constructor_callback (struct bfd_link_info *info,
1107 bfd_boolean constructor,
1114 struct bfd_link_hash_entry *h;
1115 char set_name[1 + sizeof "__CTOR_LIST__"];
1117 if (config.warn_constructors)
1118 einfo (_("%P: warning: global constructor %s used\n"), name);
1120 if (! config.build_constructors)
1123 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1124 useful error message. */
1125 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1126 && (link_info.relocatable
1127 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1128 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1131 if (bfd_get_symbol_leading_char (abfd) != '\0')
1132 *s++ = bfd_get_symbol_leading_char (abfd);
1134 strcpy (s, "__CTOR_LIST__");
1136 strcpy (s, "__DTOR_LIST__");
1138 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1139 if (h == (struct bfd_link_hash_entry *) NULL)
1140 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1141 if (h->type == bfd_link_hash_new)
1143 h->type = bfd_link_hash_undefined;
1144 h->u.undef.abfd = abfd;
1145 /* We don't call bfd_link_add_undef to add this to the list of
1146 undefined symbols because we are going to define it
1150 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1154 /* A structure used by warning_callback to pass information through
1155 bfd_map_over_sections. */
1157 struct warning_callback_info
1160 const char *warning;
1165 /* This is called when there is a reference to a warning symbol. */
1168 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1169 const char *warning,
1175 /* This is a hack to support warn_multiple_gp. FIXME: This should
1176 have a cleaner interface, but what? */
1177 if (! config.warn_multiple_gp
1178 && strcmp (warning, "using multiple gp values") == 0)
1181 if (section != NULL)
1182 einfo ("%C: %s\n", abfd, section, address, warning);
1183 else if (abfd == NULL)
1184 einfo ("%P: %s\n", warning);
1185 else if (symbol == NULL)
1186 einfo ("%B: %s\n", abfd, warning);
1189 lang_input_statement_type *entry;
1191 struct warning_callback_info info;
1193 /* Look through the relocs to see if we can find a plausible
1195 entry = (lang_input_statement_type *) abfd->usrdata;
1196 if (entry != NULL && entry->asymbols != NULL)
1197 asymbols = entry->asymbols;
1203 symsize = bfd_get_symtab_upper_bound (abfd);
1205 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1206 asymbols = xmalloc (symsize);
1207 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1208 if (symbol_count < 0)
1209 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1212 entry->asymbols = asymbols;
1213 entry->symbol_count = symbol_count;
1218 info.warning = warning;
1219 info.symbol = symbol;
1220 info.asymbols = asymbols;
1221 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1224 einfo ("%B: %s\n", abfd, warning);
1233 /* This is called by warning_callback for each section. It checks the
1234 relocs of the section to see if it can find a reference to the
1235 symbol which triggered the warning. If it can, it uses the reloc
1236 to give an error message with a file and line number. */
1239 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1241 struct warning_callback_info *info = iarg;
1245 arelent **p, **pend;
1250 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1252 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1256 relpp = xmalloc (relsize);
1257 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1259 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1262 pend = p + relcount;
1263 for (; p < pend && *p != NULL; p++)
1267 if (q->sym_ptr_ptr != NULL
1268 && *q->sym_ptr_ptr != NULL
1269 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1271 /* We found a reloc for the symbol we are looking for. */
1272 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1281 /* This is called when an undefined symbol is found. */
1284 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1291 static char *error_name;
1292 static unsigned int error_count;
1294 #define MAX_ERRORS_IN_A_ROW 5
1296 if (config.warn_once)
1298 static struct bfd_hash_table *hash;
1300 /* Only warn once about a particular undefined symbol. */
1303 hash = xmalloc (sizeof (struct bfd_hash_table));
1304 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1305 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1308 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1311 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1312 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1315 /* We never print more than a reasonable number of errors in a row
1316 for a single symbol. */
1317 if (error_name != NULL
1318 && strcmp (name, error_name) == 0)
1323 if (error_name != NULL)
1325 error_name = xstrdup (name);
1328 if (section != NULL)
1330 if (error_count < MAX_ERRORS_IN_A_ROW)
1333 einfo (_("%X%C: undefined reference to `%T'\n"),
1334 abfd, section, address, name);
1336 einfo (_("%C: warning: undefined reference to `%T'\n"),
1337 abfd, section, address, name);
1339 else if (error_count == MAX_ERRORS_IN_A_ROW)
1342 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1343 abfd, section, address, name);
1345 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1346 abfd, section, address, name);
1353 if (error_count < MAX_ERRORS_IN_A_ROW)
1356 einfo (_("%X%B: undefined reference to `%T'\n"),
1359 einfo (_("%B: warning: undefined reference to `%T'\n"),
1362 else if (error_count == MAX_ERRORS_IN_A_ROW)
1365 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1368 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1378 /* Counter to limit the number of relocation overflow error messages
1379 to print. Errors are printed as it is decremented. When it's
1380 called and the counter is zero, a final message is printed
1381 indicating more relocations were omitted. When it gets to -1, no
1382 such errors are printed. If it's initially set to a value less
1383 than -1, all such errors will be printed (--verbose does this). */
1385 int overflow_cutoff_limit = 10;
1387 /* This is called when a reloc overflows. */
1390 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1391 struct bfd_link_hash_entry *entry,
1393 const char *reloc_name,
1399 if (overflow_cutoff_limit == -1)
1403 einfo (_("%P%X: generated"));
1405 einfo ("%X%C:", abfd, section, address);
1407 if (overflow_cutoff_limit >= 0
1408 && overflow_cutoff_limit-- == 0)
1410 einfo (_(" additional relocation overflows omitted from the output\n"));
1416 while (entry->type == bfd_link_hash_indirect
1417 || entry->type == bfd_link_hash_warning)
1418 entry = entry->u.i.link;
1419 switch (entry->type)
1421 case bfd_link_hash_undefined:
1422 case bfd_link_hash_undefweak:
1423 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1424 reloc_name, entry->root.string);
1426 case bfd_link_hash_defined:
1427 case bfd_link_hash_defweak:
1428 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1429 reloc_name, entry->root.string,
1430 entry->u.def.section, entry->u.def.section->owner);
1438 einfo (_(" relocation truncated to fit: %s against `%T'"),
1441 einfo ("+%v", addend);
1446 /* This is called when a dangerous relocation is made. */
1449 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1450 const char *message,
1456 einfo (_("%P%X: generated"));
1458 einfo ("%X%C:", abfd, section, address);
1459 einfo (_("dangerous relocation: %s\n"), message);
1463 /* This is called when a reloc is being generated attached to a symbol
1464 that is not being output. */
1467 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1474 einfo (_("%P%X: generated"));
1476 einfo ("%X%C:", abfd, section, address);
1477 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1481 /* This is called if link_info.notice_all is set, or when a symbol in
1482 link_info.notice_hash is found. Symbols are put in notice_hash
1483 using the -y option. */
1486 notice (struct bfd_link_info *info,
1492 if (! info->notice_all
1493 || (info->notice_hash != NULL
1494 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1496 if (bfd_is_und_section (section))
1497 einfo ("%B: reference to %s\n", abfd, name);
1499 einfo ("%B: definition of %s\n", abfd, name);
1502 if (command_line.cref || nocrossref_list != NULL)
1503 add_cref (name, abfd, section, value);