1 /* Main program of GNU linker.
2 Copyright (C) 1991-2019 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
5 This file is part of the GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "safe-ctype.h"
25 #include "libiberty.h"
28 #include "filenames.h"
43 #include "plugin-api.h"
44 #endif /* ENABLE_PLUGINS */
46 /* Somewhere above, sys/stat.h got included. */
47 #if !defined(S_ISDIR) && defined(S_IFDIR)
48 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
53 #ifndef TARGET_SYSTEM_ROOT
54 #define TARGET_SYSTEM_ROOT ""
59 FILE *saved_script_handle = NULL;
60 FILE *previous_script_handle = NULL;
61 bfd_boolean force_make_executable = FALSE;
64 const char *output_filename = "a.out";
66 /* Name this program was invoked by. */
69 /* The prefix for system library directories. */
70 const char *ld_sysroot;
72 /* The canonical representation of ld_sysroot. */
73 char *ld_canon_sysroot;
74 int ld_canon_sysroot_len;
76 /* Set by -G argument, for targets like MIPS ELF. */
77 int g_switch_value = 8;
79 /* Nonzero means print names of input files as processed. */
80 unsigned int trace_files;
82 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
85 /* Nonzero means version number was printed, so exit successfully
86 instead of complaining if no input files are given. */
87 bfd_boolean version_printed;
89 /* TRUE if we should demangle symbol names. */
90 bfd_boolean demangling;
92 args_type command_line;
94 ld_config_type config;
96 sort_type sort_section;
98 static const char *get_sysroot
100 static char *get_emulation
102 static bfd_boolean add_archive_element
103 (struct bfd_link_info *, bfd *, const char *, bfd **);
104 static void multiple_definition
105 (struct bfd_link_info *, struct bfd_link_hash_entry *,
106 bfd *, asection *, bfd_vma);
107 static void multiple_common
108 (struct bfd_link_info *, struct bfd_link_hash_entry *,
109 bfd *, enum bfd_link_hash_type, bfd_vma);
110 static void add_to_set
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
113 static void constructor_callback
114 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
115 asection *, bfd_vma);
116 static void warning_callback
117 (struct bfd_link_info *, const char *, const char *, bfd *,
118 asection *, bfd_vma);
119 static void warning_find_reloc
120 (bfd *, asection *, void *);
121 static void undefined_symbol
122 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
124 static void reloc_overflow
125 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
126 const char *, bfd_vma, bfd *, asection *, bfd_vma);
127 static void reloc_dangerous
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
129 static void unattached_reloc
130 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
131 static bfd_boolean notice
132 (struct bfd_link_info *, struct bfd_link_hash_entry *,
133 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
135 static struct bfd_link_callbacks link_callbacks =
141 constructor_callback,
151 ldlang_override_segment_assignment
154 static bfd_assert_handler_type default_bfd_assert_handler;
155 static bfd_error_handler_type default_bfd_error_handler;
157 struct bfd_link_info link_info;
162 bfd_cache_close_all ();
163 #ifdef ENABLE_PLUGINS
164 plugin_call_cleanup ();
166 if (output_filename && delete_output_file_on_failure)
167 unlink_if_ordinary (output_filename);
170 /* Hook to notice BFD assertions. */
173 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
174 const char *file, int line)
176 config.make_executable = FALSE;
177 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
180 /* Hook the bfd error/warning handler for --fatal-warnings. */
183 ld_bfd_error_handler (const char *fmt, va_list ap)
185 if (config.fatal_warnings)
186 config.make_executable = FALSE;
187 (*default_bfd_error_handler) (fmt, ap);
191 main (int argc, char **argv)
194 long start_time = get_run_time ();
196 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
197 setlocale (LC_MESSAGES, "");
199 #if defined (HAVE_SETLOCALE)
200 setlocale (LC_CTYPE, "");
202 bindtextdomain (PACKAGE, LOCALEDIR);
203 textdomain (PACKAGE);
205 program_name = argv[0];
206 xmalloc_set_program_name (program_name);
208 START_PROGRESS (program_name, 0);
210 expandargv (&argc, &argv);
212 if (bfd_init () != BFD_INIT_MAGIC)
213 einfo (_("%F%P: fatal error: libbfd ABI mismatch\n"));
215 bfd_set_error_program_name (program_name);
217 /* We want to notice and fail on those nasty BFD assertions which are
218 likely to signal incorrect output being generated but otherwise may
220 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
222 /* Also hook the bfd error/warning handler for --fatal-warnings. */
223 default_bfd_error_handler = bfd_set_error_handler (ld_bfd_error_handler);
225 xatexit (ld_cleanup);
227 /* Set up the sysroot directory. */
228 ld_sysroot = get_sysroot (argc, argv);
230 ld_canon_sysroot = lrealpath (ld_sysroot);
231 if (ld_canon_sysroot)
233 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
235 /* is_sysrooted_pathname() relies on no trailing dirsep. */
236 if (ld_canon_sysroot_len > 0
237 && IS_DIR_SEPARATOR (ld_canon_sysroot [ld_canon_sysroot_len - 1]))
238 ld_canon_sysroot [--ld_canon_sysroot_len] = '\0';
241 ld_canon_sysroot_len = -1;
243 /* Set the default BFD target based on the configured target. Doing
244 this permits the linker to be configured for a particular target,
245 and linked against a shared BFD library which was configured for
246 a different target. The macro TARGET is defined by Makefile. */
247 if (!bfd_set_default_target (TARGET))
249 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
260 config.build_constructors = TRUE;
261 config.rpath_separator = ':';
262 config.split_by_reloc = (unsigned) -1;
263 config.split_by_file = (bfd_size_type) -1;
264 config.make_executable = TRUE;
265 config.magic_demand_paged = TRUE;
266 config.text_read_only = TRUE;
267 config.print_map_discarded = TRUE;
268 link_info.disable_target_specific_optimizations = -1;
270 command_line.warn_mismatch = TRUE;
271 command_line.warn_search_mismatch = TRUE;
272 command_line.check_section_addresses = -1;
274 /* We initialize DEMANGLING based on the environment variable
275 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
276 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
277 environment. Acting the same way here lets us provide the same
278 interface by default. */
279 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
281 link_info.allow_undefined_version = TRUE;
282 link_info.keep_memory = TRUE;
283 link_info.combreloc = TRUE;
284 link_info.strip_discarded = TRUE;
285 link_info.prohibit_multiple_definition_absolute = FALSE;
286 link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
287 link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
288 link_info.callbacks = &link_callbacks;
289 link_info.input_bfds_tail = &link_info.input_bfds;
290 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
291 and _fini symbols. We are compatible. */
292 link_info.init_function = "_init";
293 link_info.fini_function = "_fini";
294 link_info.relax_pass = 1;
295 link_info.extern_protected_data = -1;
296 link_info.dynamic_undefined_weak = -1;
297 link_info.pei386_auto_import = -1;
298 link_info.spare_dynamic_tags = 5;
299 link_info.path_separator = ':';
300 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
301 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
303 #ifdef DEFAULT_NEW_DTAGS
304 link_info.new_dtags = DEFAULT_NEW_DTAGS;
307 ldfile_add_arch ("");
308 emulation = get_emulation (argc, argv);
309 ldemul_choose_mode (emulation);
310 default_target = ldemul_choose_target (argc, argv);
313 ldemul_before_parse ();
314 lang_has_input_file = FALSE;
315 parse_args (argc, argv);
317 if (config.hash_table_size != 0)
318 bfd_hash_set_default_size (config.hash_table_size);
320 #ifdef ENABLE_PLUGINS
321 /* Now all the plugin arguments have been gathered, we can load them. */
322 plugin_load_plugins ();
323 #endif /* ENABLE_PLUGINS */
325 ldemul_set_symbols ();
327 /* If we have not already opened and parsed a linker script,
328 try the default script from command line first. */
329 if (saved_script_handle == NULL
330 && command_line.default_script != NULL)
332 ldfile_open_script_file (command_line.default_script);
333 parser_input = input_script;
337 /* If we have not already opened and parsed a linker script
338 read the emulation's appropriate default script. */
339 if (saved_script_handle == NULL)
342 char *s = ldemul_get_script (&isfile);
345 ldfile_open_default_command_file (s);
349 lex_redirect (s, _("built in linker script"), 1);
351 parser_input = input_script;
358 if (saved_script_handle)
359 info_msg (_("using external linker script:"));
361 info_msg (_("using internal linker script:"));
362 info_msg ("\n==================================================\n");
364 if (saved_script_handle)
366 static const int ld_bufsz = 8193;
368 char *buf = (char *) xmalloc (ld_bufsz);
370 rewind (saved_script_handle);
371 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
374 info_msg ("%s", buf);
376 rewind (saved_script_handle);
383 info_msg (ldemul_get_script (&isfile));
386 info_msg ("\n==================================================\n");
389 if (command_line.force_group_allocation
390 || !bfd_link_relocatable (&link_info))
391 link_info.resolve_section_groups = TRUE;
393 link_info.resolve_section_groups = FALSE;
395 if (command_line.print_output_format)
396 info_msg ("%s\n", lang_get_output_target ());
400 /* If the only command line argument has been -v or --version or --verbose
401 then ignore any input files provided by linker scripts and exit now.
402 We do not want to create an output file when the linker is just invoked
403 to provide version information. */
404 if (argc == 2 && version_printed)
407 if (link_info.inhibit_common_definition && !bfd_link_dll (&link_info))
408 einfo (_("%F%P: --no-define-common may not be used without -shared\n"));
410 if (!lang_has_input_file)
412 if (version_printed || command_line.print_output_format)
414 einfo (_("%F%P: no input files\n"));
418 info_msg (_("%P: mode %s\n"), emulation);
420 ldemul_after_parse ();
422 if (config.map_filename)
424 if (strcmp (config.map_filename, "-") == 0)
426 config.map_file = stdout;
430 config.map_file = fopen (config.map_filename, FOPEN_WT);
431 if (config.map_file == (FILE *) NULL)
433 bfd_set_error (bfd_error_system_call);
434 einfo (_("%F%P: cannot open map file %s: %E\n"),
435 config.map_filename);
438 link_info.has_map_file = TRUE;
443 /* Print error messages for any missing symbols, for any warning
444 symbols, and possibly multiple definitions. */
445 if (bfd_link_relocatable (&link_info))
446 link_info.output_bfd->flags &= ~EXEC_P;
448 link_info.output_bfd->flags |= EXEC_P;
450 if ((link_info.compress_debug & COMPRESS_DEBUG))
452 link_info.output_bfd->flags |= BFD_COMPRESS;
453 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
454 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
459 if (config.map_file != NULL)
461 if (command_line.cref)
462 output_cref (config.map_file != NULL ? config.map_file : stdout);
463 if (nocrossref_list != NULL)
464 check_nocrossrefs ();
465 if (command_line.print_memory_usage)
466 lang_print_memory_usage ();
469 struct bfd_link_hash_entry *h;
471 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
472 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
478 /* Even if we're producing relocatable output, some non-fatal errors should
479 be reported in the exit status. (What non-fatal errors, if any, do we
480 want to ignore for relocatable output?) */
481 if (!config.make_executable && !force_make_executable)
484 einfo (_("%P: link errors found, deleting executable `%s'\n"),
487 /* The file will be removed by ld_cleanup. */
492 if (!bfd_close (link_info.output_bfd))
493 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info.output_bfd);
495 /* If the --force-exe-suffix is enabled, and we're making an
496 executable file and it doesn't end in .exe, copy it to one
498 if (!bfd_link_relocatable (&link_info)
499 && command_line.force_exe_suffix)
501 int len = strlen (output_filename);
504 || (strcasecmp (output_filename + len - 4, ".exe") != 0
505 && strcasecmp (output_filename + len - 4, ".dll") != 0))
509 const int bsize = 4096;
510 char *buf = (char *) xmalloc (bsize);
512 char *dst_name = (char *) xmalloc (len + 5);
514 strcpy (dst_name, output_filename);
515 strcat (dst_name, ".exe");
516 src = fopen (output_filename, FOPEN_RB);
517 dst = fopen (dst_name, FOPEN_WB);
520 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
523 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
525 while ((l = fread (buf, 1, bsize, src)) > 0)
527 int done = fwrite (buf, 1, l, dst);
530 einfo (_("%P: error writing file `%s'\n"), dst_name);
534 if (fclose (dst) == EOF)
535 einfo (_("%P: error closing file `%s'\n"), dst_name);
542 END_PROGRESS (program_name);
546 long run_time = get_run_time () - start_time;
549 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
550 program_name, run_time / 1000000, run_time % 1000000);
554 /* Prevent ld_cleanup from doing anything, after a successful link. */
555 output_filename = NULL;
561 /* If the configured sysroot is relocatable, try relocating it based on
562 default prefix FROM. Return the relocated directory if it exists,
563 otherwise return null. */
566 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
568 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
572 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
575 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
583 /* Return the sysroot directory. Return "" if no sysroot is being used. */
586 get_sysroot (int argc, char **argv)
589 const char *path = NULL;
591 for (i = 1; i < argc; i++)
592 if (CONST_STRNEQ (argv[i], "--sysroot="))
593 path = argv[i] + strlen ("--sysroot=");
596 path = get_relative_sysroot (BINDIR);
599 path = get_relative_sysroot (TOOLBINDIR);
602 path = TARGET_SYSTEM_ROOT;
604 if (IS_DIR_SEPARATOR (*path) && path[1] == 0)
610 /* We need to find any explicitly given emulation in order to initialize the
611 state that's needed by the lex&yacc argument parser (parse_args). */
614 get_emulation (int argc, char **argv)
619 emulation = getenv (EMULATION_ENVIRON);
620 if (emulation == NULL)
621 emulation = DEFAULT_EMULATION;
623 for (i = 1; i < argc; i++)
625 if (CONST_STRNEQ (argv[i], "-m"))
627 if (argv[i][2] == '\0')
632 emulation = argv[i + 1];
636 einfo (_("%F%P: missing argument to -m\n"));
638 else if (strcmp (argv[i], "-mips1") == 0
639 || strcmp (argv[i], "-mips2") == 0
640 || strcmp (argv[i], "-mips3") == 0
641 || strcmp (argv[i], "-mips4") == 0
642 || strcmp (argv[i], "-mips5") == 0
643 || strcmp (argv[i], "-mips32") == 0
644 || strcmp (argv[i], "-mips32r2") == 0
645 || strcmp (argv[i], "-mips32r6") == 0
646 || strcmp (argv[i], "-mips64") == 0
647 || strcmp (argv[i], "-mips64r2") == 0
648 || strcmp (argv[i], "-mips64r6") == 0)
650 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
651 passed to the linker by some MIPS compilers. They
652 generally tell the linker to use a slightly different
653 library path. Perhaps someday these should be
654 implemented as emulations; until then, we just ignore
655 the arguments and hope that nobody ever creates
656 emulations named ips1, ips2 or ips3. */
658 else if (strcmp (argv[i], "-m486") == 0)
660 /* FIXME: The argument -m486 is passed to the linker on
661 some Linux systems. Hope that nobody creates an
662 emulation named 486. */
667 emulation = &argv[i][2];
676 add_ysym (const char *name)
678 if (link_info.notice_hash == NULL)
680 link_info.notice_hash
681 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
682 if (!bfd_hash_table_init_n (link_info.notice_hash,
684 sizeof (struct bfd_hash_entry),
686 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
689 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
690 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
694 add_ignoresym (struct bfd_link_info *info, const char *name)
696 if (info->ignore_hash == NULL)
698 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
699 if (!bfd_hash_table_init_n (info->ignore_hash,
701 sizeof (struct bfd_hash_entry),
703 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
706 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
707 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
710 /* Record a symbol to be wrapped, from the --wrap option. */
713 add_wrap (const char *name)
715 if (link_info.wrap_hash == NULL)
718 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
719 if (!bfd_hash_table_init_n (link_info.wrap_hash,
721 sizeof (struct bfd_hash_entry),
723 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
726 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
727 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
730 /* Handle the -retain-symbols-file option. */
733 add_keepsyms_file (const char *filename)
740 if (link_info.strip == strip_some)
741 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
743 file = fopen (filename, "r");
746 bfd_set_error (bfd_error_system_call);
747 einfo ("%X%P: %s: %E\n", filename);
751 link_info.keep_hash = (struct bfd_hash_table *)
752 xmalloc (sizeof (struct bfd_hash_table));
753 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
754 sizeof (struct bfd_hash_entry)))
755 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
758 buf = (char *) xmalloc (bufsize);
770 while (!ISSPACE (c) && c != EOF)
777 buf = (char *) xrealloc (buf, bufsize);
784 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
785 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
789 if (link_info.strip != strip_none)
790 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
793 link_info.strip = strip_some;
797 /* Callbacks from the BFD linker routines. */
799 /* This is called when BFD has decided to include an archive member in
803 add_archive_element (struct bfd_link_info *info,
806 bfd **subsbfd ATTRIBUTE_UNUSED)
808 lang_input_statement_type *input;
809 lang_input_statement_type *parent;
810 lang_input_statement_type orig_input;
812 input = (lang_input_statement_type *)
813 xcalloc (1, sizeof (lang_input_statement_type));
814 input->header.type = lang_input_statement_enum;
815 input->filename = abfd->filename;
816 input->local_sym_name = abfd->filename;
817 input->the_bfd = abfd;
819 parent = abfd->my_archive->usrdata;
820 if (parent != NULL && !parent->flags.reload)
821 parent->next = (lang_statement_union_type *) input;
823 /* Save the original data for trace files/tries below, as plugins
824 (if enabled) may possibly alter it to point to a replacement
825 BFD, but we still want to output the original BFD filename. */
827 #ifdef ENABLE_PLUGINS
828 if (link_info.lto_plugin_active)
830 /* We must offer this archive member to the plugins to claim. */
831 plugin_maybe_claim (input);
832 if (input->flags.claimed)
834 if (no_more_claiming)
836 /* Don't claim new IR symbols after all IR symbols have
839 info_msg ("%pI: no new IR symbols to claimi\n",
841 input->flags.claimed = 0;
844 input->flags.claim_archive = TRUE;
845 *subsbfd = input->the_bfd;
848 #endif /* ENABLE_PLUGINS */
850 ldlang_add_file (input);
852 if (config.map_file != NULL)
854 static bfd_boolean header_printed;
855 struct bfd_link_hash_entry *h;
859 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
861 && info->pei386_auto_import
862 && CONST_STRNEQ (name, "__imp_"))
863 h = bfd_link_hash_lookup (info->hash, name + 6, FALSE, FALSE, TRUE);
875 case bfd_link_hash_defined:
876 case bfd_link_hash_defweak:
877 from = h->u.def.section->owner;
880 case bfd_link_hash_undefined:
881 case bfd_link_hash_undefweak:
882 from = h->u.undef.abfd;
885 case bfd_link_hash_common:
886 from = h->u.c.p->section->owner;
893 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
894 header_printed = TRUE;
897 if (abfd->my_archive == NULL
898 || bfd_is_thin_archive (abfd->my_archive))
900 minfo ("%s", bfd_get_filename (abfd));
901 len = strlen (bfd_get_filename (abfd));
905 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
906 bfd_get_filename (abfd));
907 len = (strlen (bfd_get_filename (abfd->my_archive))
908 + strlen (bfd_get_filename (abfd))
924 minfo ("%pB ", from);
926 minfo ("(%pT)\n", h->root.string);
928 minfo ("(%s)\n", name);
933 || (trace_files && bfd_is_thin_archive (orig_input.the_bfd->my_archive)))
934 info_msg ("%pI\n", &orig_input);
938 /* This is called when BFD has discovered a symbol which is defined
942 multiple_definition (struct bfd_link_info *info,
943 struct bfd_link_hash_entry *h,
953 if (info->allow_multiple_definition)
958 case bfd_link_hash_defined:
959 osec = h->u.def.section;
960 oval = h->u.def.value;
961 obfd = h->u.def.section->owner;
963 case bfd_link_hash_indirect:
964 osec = bfd_ind_section_ptr;
972 /* Ignore a redefinition of an absolute symbol to the
973 same value; it's harmless. */
974 if (h->type == bfd_link_hash_defined
975 && bfd_is_abs_section (osec)
976 && bfd_is_abs_section (nsec)
980 /* If either section has the output_section field set to
981 bfd_abs_section_ptr, it means that the section is being
982 discarded, and this is not really a multiple definition at all.
983 FIXME: It would be cleaner to somehow ignore symbols defined in
984 sections which are being discarded. */
985 if (!info->prohibit_multiple_definition_absolute
986 && ((osec->output_section != NULL
987 && ! bfd_is_abs_section (osec)
988 && bfd_is_abs_section (osec->output_section))
989 || (nsec->output_section != NULL
990 && !bfd_is_abs_section (nsec)
991 && bfd_is_abs_section (nsec->output_section))))
994 name = h->root.string;
1002 einfo (_("%X%P: %C: multiple definition of `%pT'"),
1003 nbfd, nsec, nval, name);
1005 einfo (_("; %D: first defined here"), obfd, osec, oval);
1008 if (RELAXATION_ENABLED_BY_USER)
1010 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1015 /* This is called when there is a definition of a common symbol, or
1016 when a common symbol is found for a symbol that is already defined,
1017 or when two common symbols are found. We only do something if
1018 -warn-common was used. */
1021 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1022 struct bfd_link_hash_entry *h,
1024 enum bfd_link_hash_type ntype,
1029 enum bfd_link_hash_type otype;
1032 if (!config.warn_common)
1035 name = h->root.string;
1037 if (otype == bfd_link_hash_common)
1039 obfd = h->u.c.p->section->owner;
1040 osize = h->u.c.size;
1042 else if (otype == bfd_link_hash_defined
1043 || otype == bfd_link_hash_defweak)
1045 obfd = h->u.def.section->owner;
1050 /* FIXME: It would nice if we could report the BFD which defined
1051 an indirect symbol, but we don't have anywhere to store the
1057 if (ntype == bfd_link_hash_defined
1058 || ntype == bfd_link_hash_defweak
1059 || ntype == bfd_link_hash_indirect)
1061 ASSERT (otype == bfd_link_hash_common);
1063 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1067 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1070 else if (otype == bfd_link_hash_defined
1071 || otype == bfd_link_hash_defweak
1072 || otype == bfd_link_hash_indirect)
1074 ASSERT (ntype == bfd_link_hash_common);
1076 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1080 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1085 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1089 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1090 " by larger common from %pB\n"),
1093 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1094 " by larger common\n"),
1097 else if (nsize > osize)
1100 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1101 " smaller common from %pB\n"),
1104 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1105 " smaller common\n"),
1111 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1114 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1120 /* This is called when BFD has discovered a set element. H is the
1121 entry in the linker hash table for the set. SECTION and VALUE
1122 represent a value which should be added to the set. */
1125 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1126 struct bfd_link_hash_entry *h,
1127 bfd_reloc_code_real_type reloc,
1132 if (config.warn_constructors)
1133 einfo (_("%P: warning: global constructor %s used\n"),
1136 if (!config.build_constructors)
1139 ldctor_add_set_entry (h, reloc, NULL, section, value);
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
1151 /* This is called when BFD has discovered a constructor. This is only
1152 called for some object file formats--those which do not handle
1153 constructors in some more clever fashion. This is similar to
1154 adding an element to a set, but less general. */
1157 constructor_callback (struct bfd_link_info *info,
1158 bfd_boolean constructor,
1165 struct bfd_link_hash_entry *h;
1166 char set_name[1 + sizeof "__CTOR_LIST__"];
1168 if (config.warn_constructors)
1169 einfo (_("%P: warning: global constructor %s used\n"), name);
1171 if (!config.build_constructors)
1174 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1175 useful error message. */
1176 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1177 && (bfd_link_relocatable (info)
1178 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1179 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1182 if (bfd_get_symbol_leading_char (abfd) != '\0')
1183 *s++ = bfd_get_symbol_leading_char (abfd);
1185 strcpy (s, "__CTOR_LIST__");
1187 strcpy (s, "__DTOR_LIST__");
1189 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1190 if (h == (struct bfd_link_hash_entry *) NULL)
1191 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1192 if (h->type == bfd_link_hash_new)
1194 h->type = bfd_link_hash_undefined;
1195 h->u.undef.abfd = abfd;
1196 /* We don't call bfd_link_add_undef to add this to the list of
1197 undefined symbols because we are going to define it
1201 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1204 /* A structure used by warning_callback to pass information through
1205 bfd_map_over_sections. */
1207 struct warning_callback_info
1210 const char *warning;
1215 /* Look through the relocs to see if we can find a plausible address
1216 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1219 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1221 struct warning_callback_info cinfo;
1223 if (!bfd_generic_link_read_symbols (abfd))
1224 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd);
1226 cinfo.found = FALSE;
1227 cinfo.warning = warning;
1228 cinfo.symbol = symbol;
1229 cinfo.asymbols = bfd_get_outsymbols (abfd);
1230 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1234 /* This is called when there is a reference to a warning symbol. */
1237 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1238 const char *warning,
1244 /* This is a hack to support warn_multiple_gp. FIXME: This should
1245 have a cleaner interface, but what? */
1246 if (!config.warn_multiple_gp
1247 && strcmp (warning, "using multiple gp values") == 0)
1250 if (section != NULL)
1251 einfo ("%P: %C: %s%s\n", abfd, section, address, _("warning: "), warning);
1252 else if (abfd == NULL)
1253 einfo ("%P: %s%s\n", _("warning: "), warning);
1254 else if (symbol == NULL)
1255 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1256 else if (!symbol_warning (warning, symbol, abfd))
1259 /* Search all input files for a reference to SYMBOL. */
1260 for (b = info->input_bfds; b; b = b->link.next)
1261 if (b != abfd && symbol_warning (warning, symbol, b))
1263 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1267 /* This is called by warning_callback for each section. It checks the
1268 relocs of the section to see if it can find a reference to the
1269 symbol which triggered the warning. If it can, it uses the reloc
1270 to give an error message with a file and line number. */
1273 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1275 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1279 arelent **p, **pend;
1284 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1286 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1290 relpp = (arelent **) xmalloc (relsize);
1291 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1293 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1296 pend = p + relcount;
1297 for (; p < pend && *p != NULL; p++)
1301 if (q->sym_ptr_ptr != NULL
1302 && *q->sym_ptr_ptr != NULL
1303 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1305 /* We found a reloc for the symbol we are looking for. */
1306 einfo ("%P: %C: %s%s\n", abfd, sec, q->address, _("warning: "),
1316 /* This is called when an undefined symbol is found. */
1319 undefined_symbol (struct bfd_link_info *info,
1326 static char *error_name;
1327 static unsigned int error_count;
1329 #define MAX_ERRORS_IN_A_ROW 5
1331 if (info->ignore_hash != NULL
1332 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1335 if (config.warn_once)
1337 /* Only warn once about a particular undefined symbol. */
1338 add_ignoresym (info, name);
1341 /* We never print more than a reasonable number of errors in a row
1342 for a single symbol. */
1343 if (error_name != NULL
1344 && strcmp (name, error_name) == 0)
1349 if (error_name != NULL)
1351 error_name = xstrdup (name);
1354 if (section != NULL)
1356 if (error_count < MAX_ERRORS_IN_A_ROW)
1359 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1360 abfd, section, address, name);
1362 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1363 abfd, section, address, name);
1365 else if (error_count == MAX_ERRORS_IN_A_ROW)
1368 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1369 abfd, section, address, name);
1371 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1372 abfd, section, address, name);
1379 if (error_count < MAX_ERRORS_IN_A_ROW)
1382 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1385 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1388 else if (error_count == MAX_ERRORS_IN_A_ROW)
1391 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1394 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1402 /* Counter to limit the number of relocation overflow error messages
1403 to print. Errors are printed as it is decremented. When it's
1404 called and the counter is zero, a final message is printed
1405 indicating more relocations were omitted. When it gets to -1, no
1406 such errors are printed. If it's initially set to a value less
1407 than -1, all such errors will be printed (--verbose does this). */
1409 int overflow_cutoff_limit = 10;
1411 /* This is called when a reloc overflows. */
1414 reloc_overflow (struct bfd_link_info *info,
1415 struct bfd_link_hash_entry *entry,
1417 const char *reloc_name,
1423 if (overflow_cutoff_limit == -1)
1426 einfo ("%X%H:", abfd, section, address);
1428 if (overflow_cutoff_limit >= 0
1429 && overflow_cutoff_limit-- == 0)
1431 einfo (_(" additional relocation overflows omitted from the output\n"));
1437 while (entry->type == bfd_link_hash_indirect
1438 || entry->type == bfd_link_hash_warning)
1439 entry = entry->u.i.link;
1440 switch (entry->type)
1442 case bfd_link_hash_undefined:
1443 case bfd_link_hash_undefweak:
1444 einfo (_(" relocation truncated to fit: "
1445 "%s against undefined symbol `%pT'"),
1446 reloc_name, entry->root.string);
1448 case bfd_link_hash_defined:
1449 case bfd_link_hash_defweak:
1450 einfo (_(" relocation truncated to fit: "
1451 "%s against symbol `%pT' defined in %pA section in %pB"),
1452 reloc_name, entry->root.string,
1453 entry->u.def.section,
1454 entry->u.def.section == bfd_abs_section_ptr
1455 ? info->output_bfd : entry->u.def.section->owner);
1463 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1466 einfo ("+%v", addend);
1470 /* This is called when a dangerous relocation is made. */
1473 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1474 const char *message,
1479 einfo (_("%X%H: dangerous relocation: %s\n"),
1480 abfd, section, address, message);
1483 /* This is called when a reloc is being generated attached to a symbol
1484 that is not being output. */
1487 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1493 einfo (_("%X%H: reloc refers to symbol `%pT' which is not being output\n"),
1494 abfd, section, address, name);
1497 /* This is called if link_info.notice_all is set, or when a symbol in
1498 link_info.notice_hash is found. Symbols are put in notice_hash
1499 using the -y option, while notice_all is set if the --cref option
1500 has been supplied, or if there are any NOCROSSREFS sections in the
1501 linker script; and if plugins are active, since they need to monitor
1502 all references from non-IR files. */
1505 notice (struct bfd_link_info *info,
1506 struct bfd_link_hash_entry *h,
1507 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1511 flagword flags ATTRIBUTE_UNUSED)
1517 if (command_line.cref || nocrossref_list != NULL)
1518 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1522 name = h->root.string;
1523 if (info->notice_hash != NULL
1524 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1526 if (bfd_is_und_section (section))
1527 einfo (_("%P: %pB: reference to %s\n"), abfd, name);
1529 einfo (_("%P: %pB: definition of %s\n"), abfd, name);
1532 if (command_line.cref || nocrossref_list != NULL)
1533 add_cref (name, abfd, section, value);