1 /* Main program of GNU linker.
2 Copyright (C) 1991-2018 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 link_info.disable_target_specific_optimizations = -1;
269 command_line.warn_mismatch = TRUE;
270 command_line.warn_search_mismatch = TRUE;
271 command_line.check_section_addresses = -1;
273 /* We initialize DEMANGLING based on the environment variable
274 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
275 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
276 environment. Acting the same way here lets us provide the same
277 interface by default. */
278 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
280 link_info.allow_undefined_version = TRUE;
281 link_info.keep_memory = TRUE;
282 link_info.combreloc = TRUE;
283 link_info.strip_discarded = TRUE;
284 link_info.prohibit_multiple_definition_absolute = FALSE;
285 link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
286 link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
287 link_info.callbacks = &link_callbacks;
288 link_info.input_bfds_tail = &link_info.input_bfds;
289 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
290 and _fini symbols. We are compatible. */
291 link_info.init_function = "_init";
292 link_info.fini_function = "_fini";
293 link_info.relax_pass = 1;
294 link_info.extern_protected_data = -1;
295 link_info.dynamic_undefined_weak = -1;
296 link_info.pei386_auto_import = -1;
297 link_info.spare_dynamic_tags = 5;
298 link_info.path_separator = ':';
299 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
300 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
302 #ifdef DEFAULT_NEW_DTAGS
303 link_info.new_dtags = DEFAULT_NEW_DTAGS;
306 ldfile_add_arch ("");
307 emulation = get_emulation (argc, argv);
308 ldemul_choose_mode (emulation);
309 default_target = ldemul_choose_target (argc, argv);
312 ldemul_before_parse ();
313 lang_has_input_file = FALSE;
314 parse_args (argc, argv);
316 if (config.hash_table_size != 0)
317 bfd_hash_set_default_size (config.hash_table_size);
319 #ifdef ENABLE_PLUGINS
320 /* Now all the plugin arguments have been gathered, we can load them. */
321 plugin_load_plugins ();
322 #endif /* ENABLE_PLUGINS */
324 ldemul_set_symbols ();
326 /* If we have not already opened and parsed a linker script,
327 try the default script from command line first. */
328 if (saved_script_handle == NULL
329 && command_line.default_script != NULL)
331 ldfile_open_command_file (command_line.default_script);
332 parser_input = input_script;
336 /* If we have not already opened and parsed a linker script
337 read the emulation's appropriate default script. */
338 if (saved_script_handle == NULL)
341 char *s = ldemul_get_script (&isfile);
344 ldfile_open_default_command_file (s);
348 lex_redirect (s, _("built in linker script"), 1);
350 parser_input = input_script;
357 if (saved_script_handle)
358 info_msg (_("using external linker script:"));
360 info_msg (_("using internal linker script:"));
361 info_msg ("\n==================================================\n");
363 if (saved_script_handle)
365 static const int ld_bufsz = 8193;
367 char *buf = (char *) xmalloc (ld_bufsz);
369 rewind (saved_script_handle);
370 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
373 info_msg ("%s", buf);
375 rewind (saved_script_handle);
382 info_msg (ldemul_get_script (&isfile));
385 info_msg ("\n==================================================\n");
388 if (command_line.force_group_allocation
389 || !bfd_link_relocatable (&link_info))
390 link_info.resolve_section_groups = TRUE;
392 link_info.resolve_section_groups = FALSE;
394 if (command_line.print_output_format)
395 info_msg ("%s\n", lang_get_output_target ());
399 /* If the only command line argument has been -v or --version or --verbose
400 then ignore any input files provided by linker scripts and exit now.
401 We do not want to create an output file when the linker is just invoked
402 to provide version information. */
403 if (argc == 2 && version_printed)
406 if (link_info.inhibit_common_definition && !bfd_link_dll (&link_info))
407 einfo (_("%F%P: --no-define-common may not be used without -shared\n"));
409 if (!lang_has_input_file)
411 if (version_printed || command_line.print_output_format)
413 einfo (_("%F%P: no input files\n"));
417 info_msg (_("%P: mode %s\n"), emulation);
419 ldemul_after_parse ();
421 if (config.map_filename)
423 if (strcmp (config.map_filename, "-") == 0)
425 config.map_file = stdout;
429 config.map_file = fopen (config.map_filename, FOPEN_WT);
430 if (config.map_file == (FILE *) NULL)
432 bfd_set_error (bfd_error_system_call);
433 einfo (_("%F%P: cannot open map file %s: %E\n"),
434 config.map_filename);
437 link_info.has_map_file = TRUE;
442 /* Print error messages for any missing symbols, for any warning
443 symbols, and possibly multiple definitions. */
444 if (bfd_link_relocatable (&link_info))
445 link_info.output_bfd->flags &= ~EXEC_P;
447 link_info.output_bfd->flags |= EXEC_P;
449 if ((link_info.compress_debug & COMPRESS_DEBUG))
451 link_info.output_bfd->flags |= BFD_COMPRESS;
452 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
453 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
458 if (config.map_file != NULL)
460 if (command_line.cref)
461 output_cref (config.map_file != NULL ? config.map_file : stdout);
462 if (nocrossref_list != NULL)
463 check_nocrossrefs ();
464 if (command_line.print_memory_usage)
465 lang_print_memory_usage ();
468 struct bfd_link_hash_entry *h;
470 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
471 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
477 /* Even if we're producing relocatable output, some non-fatal errors should
478 be reported in the exit status. (What non-fatal errors, if any, do we
479 want to ignore for relocatable output?) */
480 if (!config.make_executable && !force_make_executable)
483 einfo (_("%P: link errors found, deleting executable `%s'\n"),
486 /* The file will be removed by ld_cleanup. */
491 if (!bfd_close (link_info.output_bfd))
492 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info.output_bfd);
494 /* If the --force-exe-suffix is enabled, and we're making an
495 executable file and it doesn't end in .exe, copy it to one
497 if (!bfd_link_relocatable (&link_info)
498 && command_line.force_exe_suffix)
500 int len = strlen (output_filename);
503 || (strcasecmp (output_filename + len - 4, ".exe") != 0
504 && strcasecmp (output_filename + len - 4, ".dll") != 0))
508 const int bsize = 4096;
509 char *buf = (char *) xmalloc (bsize);
511 char *dst_name = (char *) xmalloc (len + 5);
513 strcpy (dst_name, output_filename);
514 strcat (dst_name, ".exe");
515 src = fopen (output_filename, FOPEN_RB);
516 dst = fopen (dst_name, FOPEN_WB);
519 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
522 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
524 while ((l = fread (buf, 1, bsize, src)) > 0)
526 int done = fwrite (buf, 1, l, dst);
529 einfo (_("%P: error writing file `%s'\n"), dst_name);
533 if (fclose (dst) == EOF)
534 einfo (_("%P: error closing file `%s'\n"), dst_name);
541 END_PROGRESS (program_name);
545 long run_time = get_run_time () - start_time;
548 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
549 program_name, run_time / 1000000, run_time % 1000000);
553 /* Prevent ld_cleanup from doing anything, after a successful link. */
554 output_filename = NULL;
560 /* If the configured sysroot is relocatable, try relocating it based on
561 default prefix FROM. Return the relocated directory if it exists,
562 otherwise return null. */
565 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
567 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
571 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
574 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
582 /* Return the sysroot directory. Return "" if no sysroot is being used. */
585 get_sysroot (int argc, char **argv)
588 const char *path = NULL;
590 for (i = 1; i < argc; i++)
591 if (CONST_STRNEQ (argv[i], "--sysroot="))
592 path = argv[i] + strlen ("--sysroot=");
595 path = get_relative_sysroot (BINDIR);
598 path = get_relative_sysroot (TOOLBINDIR);
601 path = TARGET_SYSTEM_ROOT;
603 if (IS_DIR_SEPARATOR (*path) && path[1] == 0)
609 /* We need to find any explicitly given emulation in order to initialize the
610 state that's needed by the lex&yacc argument parser (parse_args). */
613 get_emulation (int argc, char **argv)
618 emulation = getenv (EMULATION_ENVIRON);
619 if (emulation == NULL)
620 emulation = DEFAULT_EMULATION;
622 for (i = 1; i < argc; i++)
624 if (CONST_STRNEQ (argv[i], "-m"))
626 if (argv[i][2] == '\0')
631 emulation = argv[i + 1];
635 einfo (_("%F%P: missing argument to -m\n"));
637 else if (strcmp (argv[i], "-mips1") == 0
638 || strcmp (argv[i], "-mips2") == 0
639 || strcmp (argv[i], "-mips3") == 0
640 || strcmp (argv[i], "-mips4") == 0
641 || strcmp (argv[i], "-mips5") == 0
642 || strcmp (argv[i], "-mips32") == 0
643 || strcmp (argv[i], "-mips32r2") == 0
644 || strcmp (argv[i], "-mips32r6") == 0
645 || strcmp (argv[i], "-mips64") == 0
646 || strcmp (argv[i], "-mips64r2") == 0
647 || strcmp (argv[i], "-mips64r6") == 0)
649 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
650 passed to the linker by some MIPS compilers. They
651 generally tell the linker to use a slightly different
652 library path. Perhaps someday these should be
653 implemented as emulations; until then, we just ignore
654 the arguments and hope that nobody ever creates
655 emulations named ips1, ips2 or ips3. */
657 else if (strcmp (argv[i], "-m486") == 0)
659 /* FIXME: The argument -m486 is passed to the linker on
660 some Linux systems. Hope that nobody creates an
661 emulation named 486. */
666 emulation = &argv[i][2];
675 add_ysym (const char *name)
677 if (link_info.notice_hash == NULL)
679 link_info.notice_hash
680 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
681 if (!bfd_hash_table_init_n (link_info.notice_hash,
683 sizeof (struct bfd_hash_entry),
685 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
688 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
689 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
693 add_ignoresym (struct bfd_link_info *info, const char *name)
695 if (info->ignore_hash == NULL)
697 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
698 if (!bfd_hash_table_init_n (info->ignore_hash,
700 sizeof (struct bfd_hash_entry),
702 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
705 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
706 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
709 /* Record a symbol to be wrapped, from the --wrap option. */
712 add_wrap (const char *name)
714 if (link_info.wrap_hash == NULL)
717 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
718 if (!bfd_hash_table_init_n (link_info.wrap_hash,
720 sizeof (struct bfd_hash_entry),
722 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
725 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
726 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
729 /* Handle the -retain-symbols-file option. */
732 add_keepsyms_file (const char *filename)
739 if (link_info.strip == strip_some)
740 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
742 file = fopen (filename, "r");
745 bfd_set_error (bfd_error_system_call);
746 einfo ("%X%P: %s: %E\n", filename);
750 link_info.keep_hash = (struct bfd_hash_table *)
751 xmalloc (sizeof (struct bfd_hash_table));
752 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
753 sizeof (struct bfd_hash_entry)))
754 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
757 buf = (char *) xmalloc (bufsize);
769 while (!ISSPACE (c) && c != EOF)
776 buf = (char *) xrealloc (buf, bufsize);
783 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
784 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
788 if (link_info.strip != strip_none)
789 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
792 link_info.strip = strip_some;
796 /* Callbacks from the BFD linker routines. */
798 /* This is called when BFD has decided to include an archive member in
802 add_archive_element (struct bfd_link_info *info,
805 bfd **subsbfd ATTRIBUTE_UNUSED)
807 lang_input_statement_type *input;
808 lang_input_statement_type *parent;
809 lang_input_statement_type orig_input;
811 input = (lang_input_statement_type *)
812 xcalloc (1, sizeof (lang_input_statement_type));
813 input->header.type = lang_input_statement_enum;
814 input->filename = abfd->filename;
815 input->local_sym_name = abfd->filename;
816 input->the_bfd = abfd;
818 parent = abfd->my_archive->usrdata;
819 if (parent != NULL && !parent->flags.reload)
820 parent->next = (lang_statement_union_type *) input;
822 /* Save the original data for trace files/tries below, as plugins
823 (if enabled) may possibly alter it to point to a replacement
824 BFD, but we still want to output the original BFD filename. */
826 #ifdef ENABLE_PLUGINS
827 if (link_info.lto_plugin_active)
829 /* We must offer this archive member to the plugins to claim. */
830 plugin_maybe_claim (input);
831 if (input->flags.claimed)
833 if (no_more_claiming)
835 /* Don't claim new IR symbols after all IR symbols have
838 info_msg ("%pI: no new IR symbols to claimi\n",
840 input->flags.claimed = 0;
843 input->flags.claim_archive = TRUE;
844 *subsbfd = input->the_bfd;
847 #endif /* ENABLE_PLUGINS */
849 ldlang_add_file (input);
851 if (config.map_file != NULL)
853 static bfd_boolean header_printed;
854 struct bfd_link_hash_entry *h;
858 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
860 && info->pei386_auto_import
861 && CONST_STRNEQ (name, "__imp_"))
862 h = bfd_link_hash_lookup (info->hash, name + 6, FALSE, FALSE, TRUE);
874 case bfd_link_hash_defined:
875 case bfd_link_hash_defweak:
876 from = h->u.def.section->owner;
879 case bfd_link_hash_undefined:
880 case bfd_link_hash_undefweak:
881 from = h->u.undef.abfd;
884 case bfd_link_hash_common:
885 from = h->u.c.p->section->owner;
892 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
893 header_printed = TRUE;
896 if (abfd->my_archive == NULL
897 || bfd_is_thin_archive (abfd->my_archive))
899 minfo ("%s", bfd_get_filename (abfd));
900 len = strlen (bfd_get_filename (abfd));
904 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
905 bfd_get_filename (abfd));
906 len = (strlen (bfd_get_filename (abfd->my_archive))
907 + strlen (bfd_get_filename (abfd))
923 minfo ("%pB ", from);
925 minfo ("(%pT)\n", h->root.string);
927 minfo ("(%s)\n", name);
932 || (trace_files && bfd_is_thin_archive (orig_input.the_bfd->my_archive)))
933 info_msg ("%pI\n", &orig_input);
937 /* This is called when BFD has discovered a symbol which is defined
941 multiple_definition (struct bfd_link_info *info,
942 struct bfd_link_hash_entry *h,
952 if (info->allow_multiple_definition)
957 case bfd_link_hash_defined:
958 osec = h->u.def.section;
959 oval = h->u.def.value;
960 obfd = h->u.def.section->owner;
962 case bfd_link_hash_indirect:
963 osec = bfd_ind_section_ptr;
971 /* Ignore a redefinition of an absolute symbol to the
972 same value; it's harmless. */
973 if (h->type == bfd_link_hash_defined
974 && bfd_is_abs_section (osec)
975 && bfd_is_abs_section (nsec)
979 /* If either section has the output_section field set to
980 bfd_abs_section_ptr, it means that the section is being
981 discarded, and this is not really a multiple definition at all.
982 FIXME: It would be cleaner to somehow ignore symbols defined in
983 sections which are being discarded. */
984 if (!info->prohibit_multiple_definition_absolute
985 && ((osec->output_section != NULL
986 && ! bfd_is_abs_section (osec)
987 && bfd_is_abs_section (osec->output_section))
988 || (nsec->output_section != NULL
989 && !bfd_is_abs_section (nsec)
990 && bfd_is_abs_section (nsec->output_section))))
993 name = h->root.string;
1001 einfo (_("%X%P: %C: multiple definition of `%pT'"),
1002 nbfd, nsec, nval, name);
1004 einfo (_("; %D: first defined here"), obfd, osec, oval);
1007 if (RELAXATION_ENABLED_BY_USER)
1009 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1014 /* This is called when there is a definition of a common symbol, or
1015 when a common symbol is found for a symbol that is already defined,
1016 or when two common symbols are found. We only do something if
1017 -warn-common was used. */
1020 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1021 struct bfd_link_hash_entry *h,
1023 enum bfd_link_hash_type ntype,
1028 enum bfd_link_hash_type otype;
1031 if (!config.warn_common)
1034 name = h->root.string;
1036 if (otype == bfd_link_hash_common)
1038 obfd = h->u.c.p->section->owner;
1039 osize = h->u.c.size;
1041 else if (otype == bfd_link_hash_defined
1042 || otype == bfd_link_hash_defweak)
1044 obfd = h->u.def.section->owner;
1049 /* FIXME: It would nice if we could report the BFD which defined
1050 an indirect symbol, but we don't have anywhere to store the
1056 if (ntype == bfd_link_hash_defined
1057 || ntype == bfd_link_hash_defweak
1058 || ntype == bfd_link_hash_indirect)
1060 ASSERT (otype == bfd_link_hash_common);
1062 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1066 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1069 else if (otype == bfd_link_hash_defined
1070 || otype == bfd_link_hash_defweak
1071 || otype == bfd_link_hash_indirect)
1073 ASSERT (ntype == bfd_link_hash_common);
1075 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1079 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1084 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1088 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1089 " by larger common from %pB\n"),
1092 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1093 " by larger common\n"),
1096 else if (nsize > osize)
1099 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1100 " smaller common from %pB\n"),
1103 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1104 " smaller common\n"),
1110 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1113 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1119 /* This is called when BFD has discovered a set element. H is the
1120 entry in the linker hash table for the set. SECTION and VALUE
1121 represent a value which should be added to the set. */
1124 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1125 struct bfd_link_hash_entry *h,
1126 bfd_reloc_code_real_type reloc,
1131 if (config.warn_constructors)
1132 einfo (_("%P: warning: global constructor %s used\n"),
1135 if (!config.build_constructors)
1138 ldctor_add_set_entry (h, reloc, NULL, section, value);
1140 if (h->type == bfd_link_hash_new)
1142 h->type = bfd_link_hash_undefined;
1143 h->u.undef.abfd = abfd;
1144 /* We don't call bfd_link_add_undef to add this to the list of
1145 undefined symbols because we are going to define it
1150 /* This is called when BFD has discovered a constructor. This is only
1151 called for some object file formats--those which do not handle
1152 constructors in some more clever fashion. This is similar to
1153 adding an element to a set, but less general. */
1156 constructor_callback (struct bfd_link_info *info,
1157 bfd_boolean constructor,
1164 struct bfd_link_hash_entry *h;
1165 char set_name[1 + sizeof "__CTOR_LIST__"];
1167 if (config.warn_constructors)
1168 einfo (_("%P: warning: global constructor %s used\n"), name);
1170 if (!config.build_constructors)
1173 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1174 useful error message. */
1175 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1176 && (bfd_link_relocatable (info)
1177 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1178 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1181 if (bfd_get_symbol_leading_char (abfd) != '\0')
1182 *s++ = bfd_get_symbol_leading_char (abfd);
1184 strcpy (s, "__CTOR_LIST__");
1186 strcpy (s, "__DTOR_LIST__");
1188 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1189 if (h == (struct bfd_link_hash_entry *) NULL)
1190 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1191 if (h->type == bfd_link_hash_new)
1193 h->type = bfd_link_hash_undefined;
1194 h->u.undef.abfd = abfd;
1195 /* We don't call bfd_link_add_undef to add this to the list of
1196 undefined symbols because we are going to define it
1200 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1203 /* A structure used by warning_callback to pass information through
1204 bfd_map_over_sections. */
1206 struct warning_callback_info
1209 const char *warning;
1214 /* Look through the relocs to see if we can find a plausible address
1215 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1218 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1220 struct warning_callback_info cinfo;
1222 if (!bfd_generic_link_read_symbols (abfd))
1223 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd);
1225 cinfo.found = FALSE;
1226 cinfo.warning = warning;
1227 cinfo.symbol = symbol;
1228 cinfo.asymbols = bfd_get_outsymbols (abfd);
1229 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1233 /* This is called when there is a reference to a warning symbol. */
1236 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1237 const char *warning,
1243 /* This is a hack to support warn_multiple_gp. FIXME: This should
1244 have a cleaner interface, but what? */
1245 if (!config.warn_multiple_gp
1246 && strcmp (warning, "using multiple gp values") == 0)
1249 if (section != NULL)
1250 einfo ("%P: %C: %s%s\n", abfd, section, address, _("warning: "), warning);
1251 else if (abfd == NULL)
1252 einfo ("%P: %s%s\n", _("warning: "), warning);
1253 else if (symbol == NULL)
1254 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1255 else if (!symbol_warning (warning, symbol, abfd))
1258 /* Search all input files for a reference to SYMBOL. */
1259 for (b = info->input_bfds; b; b = b->link.next)
1260 if (b != abfd && symbol_warning (warning, symbol, b))
1262 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1266 /* This is called by warning_callback for each section. It checks the
1267 relocs of the section to see if it can find a reference to the
1268 symbol which triggered the warning. If it can, it uses the reloc
1269 to give an error message with a file and line number. */
1272 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1274 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1278 arelent **p, **pend;
1283 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1285 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1289 relpp = (arelent **) xmalloc (relsize);
1290 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1292 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1295 pend = p + relcount;
1296 for (; p < pend && *p != NULL; p++)
1300 if (q->sym_ptr_ptr != NULL
1301 && *q->sym_ptr_ptr != NULL
1302 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1304 /* We found a reloc for the symbol we are looking for. */
1305 einfo ("%P: %C: %s%s\n", abfd, sec, q->address, _("warning: "),
1315 /* This is called when an undefined symbol is found. */
1318 undefined_symbol (struct bfd_link_info *info,
1325 static char *error_name;
1326 static unsigned int error_count;
1328 #define MAX_ERRORS_IN_A_ROW 5
1330 if (info->ignore_hash != NULL
1331 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1334 if (config.warn_once)
1336 /* Only warn once about a particular undefined symbol. */
1337 add_ignoresym (info, name);
1340 /* We never print more than a reasonable number of errors in a row
1341 for a single symbol. */
1342 if (error_name != NULL
1343 && strcmp (name, error_name) == 0)
1348 if (error_name != NULL)
1350 error_name = xstrdup (name);
1353 if (section != NULL)
1355 if (error_count < MAX_ERRORS_IN_A_ROW)
1358 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1359 abfd, section, address, name);
1361 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1362 abfd, section, address, name);
1364 else if (error_count == MAX_ERRORS_IN_A_ROW)
1367 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1368 abfd, section, address, name);
1370 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1371 abfd, section, address, name);
1378 if (error_count < MAX_ERRORS_IN_A_ROW)
1381 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1384 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1387 else if (error_count == MAX_ERRORS_IN_A_ROW)
1390 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1393 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1401 /* Counter to limit the number of relocation overflow error messages
1402 to print. Errors are printed as it is decremented. When it's
1403 called and the counter is zero, a final message is printed
1404 indicating more relocations were omitted. When it gets to -1, no
1405 such errors are printed. If it's initially set to a value less
1406 than -1, all such errors will be printed (--verbose does this). */
1408 int overflow_cutoff_limit = 10;
1410 /* This is called when a reloc overflows. */
1413 reloc_overflow (struct bfd_link_info *info,
1414 struct bfd_link_hash_entry *entry,
1416 const char *reloc_name,
1422 if (overflow_cutoff_limit == -1)
1425 einfo ("%X%H:", abfd, section, address);
1427 if (overflow_cutoff_limit >= 0
1428 && overflow_cutoff_limit-- == 0)
1430 einfo (_(" additional relocation overflows omitted from the output\n"));
1436 while (entry->type == bfd_link_hash_indirect
1437 || entry->type == bfd_link_hash_warning)
1438 entry = entry->u.i.link;
1439 switch (entry->type)
1441 case bfd_link_hash_undefined:
1442 case bfd_link_hash_undefweak:
1443 einfo (_(" relocation truncated to fit: "
1444 "%s against undefined symbol `%pT'"),
1445 reloc_name, entry->root.string);
1447 case bfd_link_hash_defined:
1448 case bfd_link_hash_defweak:
1449 einfo (_(" relocation truncated to fit: "
1450 "%s against symbol `%pT' defined in %pA section in %pB"),
1451 reloc_name, entry->root.string,
1452 entry->u.def.section,
1453 entry->u.def.section == bfd_abs_section_ptr
1454 ? info->output_bfd : entry->u.def.section->owner);
1462 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1465 einfo ("+%v", addend);
1469 /* This is called when a dangerous relocation is made. */
1472 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1473 const char *message,
1478 einfo (_("%X%H: dangerous relocation: %s\n"),
1479 abfd, section, address, message);
1482 /* This is called when a reloc is being generated attached to a symbol
1483 that is not being output. */
1486 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1492 einfo (_("%X%H: reloc refers to symbol `%pT' which is not being output\n"),
1493 abfd, section, address, name);
1496 /* This is called if link_info.notice_all is set, or when a symbol in
1497 link_info.notice_hash is found. Symbols are put in notice_hash
1498 using the -y option, while notice_all is set if the --cref option
1499 has been supplied, or if there are any NOCROSSREFS sections in the
1500 linker script; and if plugins are active, since they need to monitor
1501 all references from non-IR files. */
1504 notice (struct bfd_link_info *info,
1505 struct bfd_link_hash_entry *h,
1506 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1510 flagword flags ATTRIBUTE_UNUSED)
1516 if (command_line.cref || nocrossref_list != NULL)
1517 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1521 name = h->root.string;
1522 if (info->notice_hash != NULL
1523 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1525 if (bfd_is_und_section (section))
1526 einfo (_("%P: %pB: reference to %s\n"), abfd, name);
1528 einfo (_("%P: %pB: definition of %s\n"), abfd, name);
1531 if (command_line.cref || nocrossref_list != NULL)
1532 add_cref (name, abfd, section, value);