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);
441 /* Print error messages for any missing symbols, for any warning
442 symbols, and possibly multiple definitions. */
443 if (bfd_link_relocatable (&link_info))
444 link_info.output_bfd->flags &= ~EXEC_P;
446 link_info.output_bfd->flags |= EXEC_P;
448 if ((link_info.compress_debug & COMPRESS_DEBUG))
450 link_info.output_bfd->flags |= BFD_COMPRESS;
451 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
452 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
457 if (config.map_file != NULL)
459 if (command_line.cref)
460 output_cref (config.map_file != NULL ? config.map_file : stdout);
461 if (nocrossref_list != NULL)
462 check_nocrossrefs ();
463 if (command_line.print_memory_usage)
464 lang_print_memory_usage ();
467 struct bfd_link_hash_entry *h;
469 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
470 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
476 /* Even if we're producing relocatable output, some non-fatal errors should
477 be reported in the exit status. (What non-fatal errors, if any, do we
478 want to ignore for relocatable output?) */
479 if (!config.make_executable && !force_make_executable)
482 einfo (_("%P: link errors found, deleting executable `%s'\n"),
485 /* The file will be removed by ld_cleanup. */
490 if (!bfd_close (link_info.output_bfd))
491 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info.output_bfd);
493 /* If the --force-exe-suffix is enabled, and we're making an
494 executable file and it doesn't end in .exe, copy it to one
496 if (!bfd_link_relocatable (&link_info)
497 && command_line.force_exe_suffix)
499 int len = strlen (output_filename);
502 || (strcasecmp (output_filename + len - 4, ".exe") != 0
503 && strcasecmp (output_filename + len - 4, ".dll") != 0))
507 const int bsize = 4096;
508 char *buf = (char *) xmalloc (bsize);
510 char *dst_name = (char *) xmalloc (len + 5);
512 strcpy (dst_name, output_filename);
513 strcat (dst_name, ".exe");
514 src = fopen (output_filename, FOPEN_RB);
515 dst = fopen (dst_name, FOPEN_WB);
518 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
521 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
523 while ((l = fread (buf, 1, bsize, src)) > 0)
525 int done = fwrite (buf, 1, l, dst);
528 einfo (_("%P: error writing file `%s'\n"), dst_name);
532 if (fclose (dst) == EOF)
533 einfo (_("%P: error closing file `%s'\n"), dst_name);
540 END_PROGRESS (program_name);
544 long run_time = get_run_time () - start_time;
547 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
548 program_name, run_time / 1000000, run_time % 1000000);
552 /* Prevent ld_cleanup from doing anything, after a successful link. */
553 output_filename = NULL;
559 /* If the configured sysroot is relocatable, try relocating it based on
560 default prefix FROM. Return the relocated directory if it exists,
561 otherwise return null. */
564 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
566 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
570 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
573 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
581 /* Return the sysroot directory. Return "" if no sysroot is being used. */
584 get_sysroot (int argc, char **argv)
587 const char *path = NULL;
589 for (i = 1; i < argc; i++)
590 if (CONST_STRNEQ (argv[i], "--sysroot="))
591 path = argv[i] + strlen ("--sysroot=");
594 path = get_relative_sysroot (BINDIR);
597 path = get_relative_sysroot (TOOLBINDIR);
600 path = TARGET_SYSTEM_ROOT;
602 if (IS_DIR_SEPARATOR (*path) && path[1] == 0)
608 /* We need to find any explicitly given emulation in order to initialize the
609 state that's needed by the lex&yacc argument parser (parse_args). */
612 get_emulation (int argc, char **argv)
617 emulation = getenv (EMULATION_ENVIRON);
618 if (emulation == NULL)
619 emulation = DEFAULT_EMULATION;
621 for (i = 1; i < argc; i++)
623 if (CONST_STRNEQ (argv[i], "-m"))
625 if (argv[i][2] == '\0')
630 emulation = argv[i + 1];
634 einfo (_("%F%P: missing argument to -m\n"));
636 else if (strcmp (argv[i], "-mips1") == 0
637 || strcmp (argv[i], "-mips2") == 0
638 || strcmp (argv[i], "-mips3") == 0
639 || strcmp (argv[i], "-mips4") == 0
640 || strcmp (argv[i], "-mips5") == 0
641 || strcmp (argv[i], "-mips32") == 0
642 || strcmp (argv[i], "-mips32r2") == 0
643 || strcmp (argv[i], "-mips32r6") == 0
644 || strcmp (argv[i], "-mips64") == 0
645 || strcmp (argv[i], "-mips64r2") == 0
646 || strcmp (argv[i], "-mips64r6") == 0)
648 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
649 passed to the linker by some MIPS compilers. They
650 generally tell the linker to use a slightly different
651 library path. Perhaps someday these should be
652 implemented as emulations; until then, we just ignore
653 the arguments and hope that nobody ever creates
654 emulations named ips1, ips2 or ips3. */
656 else if (strcmp (argv[i], "-m486") == 0)
658 /* FIXME: The argument -m486 is passed to the linker on
659 some Linux systems. Hope that nobody creates an
660 emulation named 486. */
665 emulation = &argv[i][2];
674 add_ysym (const char *name)
676 if (link_info.notice_hash == NULL)
678 link_info.notice_hash
679 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
680 if (!bfd_hash_table_init_n (link_info.notice_hash,
682 sizeof (struct bfd_hash_entry),
684 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
687 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
688 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
692 add_ignoresym (struct bfd_link_info *info, const char *name)
694 if (info->ignore_hash == NULL)
696 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
697 if (!bfd_hash_table_init_n (info->ignore_hash,
699 sizeof (struct bfd_hash_entry),
701 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
704 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
705 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
708 /* Record a symbol to be wrapped, from the --wrap option. */
711 add_wrap (const char *name)
713 if (link_info.wrap_hash == NULL)
716 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
717 if (!bfd_hash_table_init_n (link_info.wrap_hash,
719 sizeof (struct bfd_hash_entry),
721 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
724 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
725 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
728 /* Handle the -retain-symbols-file option. */
731 add_keepsyms_file (const char *filename)
738 if (link_info.strip == strip_some)
739 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
741 file = fopen (filename, "r");
744 bfd_set_error (bfd_error_system_call);
745 einfo ("%X%P: %s: %E\n", filename);
749 link_info.keep_hash = (struct bfd_hash_table *)
750 xmalloc (sizeof (struct bfd_hash_table));
751 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
752 sizeof (struct bfd_hash_entry)))
753 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
756 buf = (char *) xmalloc (bufsize);
768 while (!ISSPACE (c) && c != EOF)
775 buf = (char *) xrealloc (buf, bufsize);
782 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
783 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
787 if (link_info.strip != strip_none)
788 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
791 link_info.strip = strip_some;
795 /* Callbacks from the BFD linker routines. */
797 /* This is called when BFD has decided to include an archive member in
801 add_archive_element (struct bfd_link_info *info,
804 bfd **subsbfd ATTRIBUTE_UNUSED)
806 lang_input_statement_type *input;
807 lang_input_statement_type *parent;
808 lang_input_statement_type orig_input;
810 input = (lang_input_statement_type *)
811 xcalloc (1, sizeof (lang_input_statement_type));
812 input->header.type = lang_input_statement_enum;
813 input->filename = abfd->filename;
814 input->local_sym_name = abfd->filename;
815 input->the_bfd = abfd;
817 parent = abfd->my_archive->usrdata;
818 if (parent != NULL && !parent->flags.reload)
819 parent->next = (lang_statement_union_type *) input;
821 /* Save the original data for trace files/tries below, as plugins
822 (if enabled) may possibly alter it to point to a replacement
823 BFD, but we still want to output the original BFD filename. */
825 #ifdef ENABLE_PLUGINS
826 if (link_info.lto_plugin_active)
828 /* We must offer this archive member to the plugins to claim. */
829 plugin_maybe_claim (input);
830 if (input->flags.claimed)
832 if (no_more_claiming)
834 /* Don't claim new IR symbols after all IR symbols have
837 info_msg ("%pI: no new IR symbols to claimi\n",
839 input->flags.claimed = 0;
842 input->flags.claim_archive = TRUE;
843 *subsbfd = input->the_bfd;
846 #endif /* ENABLE_PLUGINS */
848 ldlang_add_file (input);
850 if (config.map_file != NULL)
852 static bfd_boolean header_printed;
853 struct bfd_link_hash_entry *h;
857 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
859 && info->pei386_auto_import
860 && CONST_STRNEQ (name, "__imp_"))
861 h = bfd_link_hash_lookup (info->hash, name + 6, FALSE, FALSE, TRUE);
873 case bfd_link_hash_defined:
874 case bfd_link_hash_defweak:
875 from = h->u.def.section->owner;
878 case bfd_link_hash_undefined:
879 case bfd_link_hash_undefweak:
880 from = h->u.undef.abfd;
883 case bfd_link_hash_common:
884 from = h->u.c.p->section->owner;
891 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
892 header_printed = TRUE;
895 if (abfd->my_archive == NULL
896 || bfd_is_thin_archive (abfd->my_archive))
898 minfo ("%s", bfd_get_filename (abfd));
899 len = strlen (bfd_get_filename (abfd));
903 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
904 bfd_get_filename (abfd));
905 len = (strlen (bfd_get_filename (abfd->my_archive))
906 + strlen (bfd_get_filename (abfd))
922 minfo ("%pB ", from);
924 minfo ("(%pT)\n", h->root.string);
926 minfo ("(%s)\n", name);
931 || (trace_files && bfd_is_thin_archive (orig_input.the_bfd->my_archive)))
932 info_msg ("%pI\n", &orig_input);
936 /* This is called when BFD has discovered a symbol which is defined
940 multiple_definition (struct bfd_link_info *info,
941 struct bfd_link_hash_entry *h,
951 if (info->allow_multiple_definition)
956 case bfd_link_hash_defined:
957 osec = h->u.def.section;
958 oval = h->u.def.value;
959 obfd = h->u.def.section->owner;
961 case bfd_link_hash_indirect:
962 osec = bfd_ind_section_ptr;
970 /* Ignore a redefinition of an absolute symbol to the
971 same value; it's harmless. */
972 if (h->type == bfd_link_hash_defined
973 && bfd_is_abs_section (osec)
974 && bfd_is_abs_section (nsec)
978 /* If either section has the output_section field set to
979 bfd_abs_section_ptr, it means that the section is being
980 discarded, and this is not really a multiple definition at all.
981 FIXME: It would be cleaner to somehow ignore symbols defined in
982 sections which are being discarded. */
983 if (!info->prohibit_multiple_definition_absolute
984 && ((osec->output_section != NULL
985 && ! bfd_is_abs_section (osec)
986 && bfd_is_abs_section (osec->output_section))
987 || (nsec->output_section != NULL
988 && !bfd_is_abs_section (nsec)
989 && bfd_is_abs_section (nsec->output_section))))
992 name = h->root.string;
1000 einfo (_("%X%P: %C: multiple definition of `%pT'"),
1001 nbfd, nsec, nval, name);
1003 einfo (_("; %D: first defined here"), obfd, osec, oval);
1006 if (RELAXATION_ENABLED_BY_USER)
1008 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1013 /* This is called when there is a definition of a common symbol, or
1014 when a common symbol is found for a symbol that is already defined,
1015 or when two common symbols are found. We only do something if
1016 -warn-common was used. */
1019 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1020 struct bfd_link_hash_entry *h,
1022 enum bfd_link_hash_type ntype,
1027 enum bfd_link_hash_type otype;
1030 if (!config.warn_common)
1033 name = h->root.string;
1035 if (otype == bfd_link_hash_common)
1037 obfd = h->u.c.p->section->owner;
1038 osize = h->u.c.size;
1040 else if (otype == bfd_link_hash_defined
1041 || otype == bfd_link_hash_defweak)
1043 obfd = h->u.def.section->owner;
1048 /* FIXME: It would nice if we could report the BFD which defined
1049 an indirect symbol, but we don't have anywhere to store the
1055 if (ntype == bfd_link_hash_defined
1056 || ntype == bfd_link_hash_defweak
1057 || ntype == bfd_link_hash_indirect)
1059 ASSERT (otype == bfd_link_hash_common);
1061 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1065 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1068 else if (otype == bfd_link_hash_defined
1069 || otype == bfd_link_hash_defweak
1070 || otype == bfd_link_hash_indirect)
1072 ASSERT (ntype == bfd_link_hash_common);
1074 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1078 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1083 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1087 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1088 " by larger common from %pB\n"),
1091 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1092 " by larger common\n"),
1095 else if (nsize > osize)
1098 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1099 " smaller common from %pB\n"),
1102 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1103 " smaller common\n"),
1109 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1112 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1118 /* This is called when BFD has discovered a set element. H is the
1119 entry in the linker hash table for the set. SECTION and VALUE
1120 represent a value which should be added to the set. */
1123 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1124 struct bfd_link_hash_entry *h,
1125 bfd_reloc_code_real_type reloc,
1130 if (config.warn_constructors)
1131 einfo (_("%P: warning: global constructor %s used\n"),
1134 if (!config.build_constructors)
1137 ldctor_add_set_entry (h, reloc, NULL, section, value);
1139 if (h->type == bfd_link_hash_new)
1141 h->type = bfd_link_hash_undefined;
1142 h->u.undef.abfd = abfd;
1143 /* We don't call bfd_link_add_undef to add this to the list of
1144 undefined symbols because we are going to define it
1149 /* This is called when BFD has discovered a constructor. This is only
1150 called for some object file formats--those which do not handle
1151 constructors in some more clever fashion. This is similar to
1152 adding an element to a set, but less general. */
1155 constructor_callback (struct bfd_link_info *info,
1156 bfd_boolean constructor,
1163 struct bfd_link_hash_entry *h;
1164 char set_name[1 + sizeof "__CTOR_LIST__"];
1166 if (config.warn_constructors)
1167 einfo (_("%P: warning: global constructor %s used\n"), name);
1169 if (!config.build_constructors)
1172 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1173 useful error message. */
1174 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1175 && (bfd_link_relocatable (info)
1176 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1177 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1180 if (bfd_get_symbol_leading_char (abfd) != '\0')
1181 *s++ = bfd_get_symbol_leading_char (abfd);
1183 strcpy (s, "__CTOR_LIST__");
1185 strcpy (s, "__DTOR_LIST__");
1187 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1188 if (h == (struct bfd_link_hash_entry *) NULL)
1189 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1190 if (h->type == bfd_link_hash_new)
1192 h->type = bfd_link_hash_undefined;
1193 h->u.undef.abfd = abfd;
1194 /* We don't call bfd_link_add_undef to add this to the list of
1195 undefined symbols because we are going to define it
1199 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1202 /* A structure used by warning_callback to pass information through
1203 bfd_map_over_sections. */
1205 struct warning_callback_info
1208 const char *warning;
1213 /* Look through the relocs to see if we can find a plausible address
1214 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1217 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1219 struct warning_callback_info cinfo;
1221 if (!bfd_generic_link_read_symbols (abfd))
1222 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd);
1224 cinfo.found = FALSE;
1225 cinfo.warning = warning;
1226 cinfo.symbol = symbol;
1227 cinfo.asymbols = bfd_get_outsymbols (abfd);
1228 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1232 /* This is called when there is a reference to a warning symbol. */
1235 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1236 const char *warning,
1242 /* This is a hack to support warn_multiple_gp. FIXME: This should
1243 have a cleaner interface, but what? */
1244 if (!config.warn_multiple_gp
1245 && strcmp (warning, "using multiple gp values") == 0)
1248 if (section != NULL)
1249 einfo ("%P: %C: %s%s\n", abfd, section, address, _("warning: "), warning);
1250 else if (abfd == NULL)
1251 einfo ("%P: %s%s\n", _("warning: "), warning);
1252 else if (symbol == NULL)
1253 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1254 else if (!symbol_warning (warning, symbol, abfd))
1257 /* Search all input files for a reference to SYMBOL. */
1258 for (b = info->input_bfds; b; b = b->link.next)
1259 if (b != abfd && symbol_warning (warning, symbol, b))
1261 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1265 /* This is called by warning_callback for each section. It checks the
1266 relocs of the section to see if it can find a reference to the
1267 symbol which triggered the warning. If it can, it uses the reloc
1268 to give an error message with a file and line number. */
1271 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1273 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1277 arelent **p, **pend;
1282 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1284 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1288 relpp = (arelent **) xmalloc (relsize);
1289 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1291 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1294 pend = p + relcount;
1295 for (; p < pend && *p != NULL; p++)
1299 if (q->sym_ptr_ptr != NULL
1300 && *q->sym_ptr_ptr != NULL
1301 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1303 /* We found a reloc for the symbol we are looking for. */
1304 einfo ("%P: %C: %s%s\n", abfd, sec, q->address, _("warning: "),
1314 /* This is called when an undefined symbol is found. */
1317 undefined_symbol (struct bfd_link_info *info,
1324 static char *error_name;
1325 static unsigned int error_count;
1327 #define MAX_ERRORS_IN_A_ROW 5
1329 if (info->ignore_hash != NULL
1330 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1333 if (config.warn_once)
1335 /* Only warn once about a particular undefined symbol. */
1336 add_ignoresym (info, name);
1339 /* We never print more than a reasonable number of errors in a row
1340 for a single symbol. */
1341 if (error_name != NULL
1342 && strcmp (name, error_name) == 0)
1347 if (error_name != NULL)
1349 error_name = xstrdup (name);
1352 if (section != NULL)
1354 if (error_count < MAX_ERRORS_IN_A_ROW)
1357 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1358 abfd, section, address, name);
1360 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1361 abfd, section, address, name);
1363 else if (error_count == MAX_ERRORS_IN_A_ROW)
1366 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1367 abfd, section, address, name);
1369 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1370 abfd, section, address, name);
1377 if (error_count < MAX_ERRORS_IN_A_ROW)
1380 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1383 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1386 else if (error_count == MAX_ERRORS_IN_A_ROW)
1389 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1392 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1400 /* Counter to limit the number of relocation overflow error messages
1401 to print. Errors are printed as it is decremented. When it's
1402 called and the counter is zero, a final message is printed
1403 indicating more relocations were omitted. When it gets to -1, no
1404 such errors are printed. If it's initially set to a value less
1405 than -1, all such errors will be printed (--verbose does this). */
1407 int overflow_cutoff_limit = 10;
1409 /* This is called when a reloc overflows. */
1412 reloc_overflow (struct bfd_link_info *info,
1413 struct bfd_link_hash_entry *entry,
1415 const char *reloc_name,
1421 if (overflow_cutoff_limit == -1)
1424 einfo ("%X%P: %H:", abfd, section, address);
1426 if (overflow_cutoff_limit >= 0
1427 && overflow_cutoff_limit-- == 0)
1429 einfo (_(" additional relocation overflows omitted from the output\n"));
1435 while (entry->type == bfd_link_hash_indirect
1436 || entry->type == bfd_link_hash_warning)
1437 entry = entry->u.i.link;
1438 switch (entry->type)
1440 case bfd_link_hash_undefined:
1441 case bfd_link_hash_undefweak:
1442 einfo (_(" relocation truncated to fit: "
1443 "%s against undefined symbol `%pT'"),
1444 reloc_name, entry->root.string);
1446 case bfd_link_hash_defined:
1447 case bfd_link_hash_defweak:
1448 einfo (_(" relocation truncated to fit: "
1449 "%s against symbol `%pT' defined in %pA section in %pB"),
1450 reloc_name, entry->root.string,
1451 entry->u.def.section,
1452 entry->u.def.section == bfd_abs_section_ptr
1453 ? info->output_bfd : entry->u.def.section->owner);
1461 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1464 einfo ("+%v", addend);
1468 /* This is called when a dangerous relocation is made. */
1471 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1472 const char *message,
1477 einfo (_("%X%P: %H: dangerous relocation: %s\n"),
1478 abfd, section, address, message);
1481 /* This is called when a reloc is being generated attached to a symbol
1482 that is not being output. */
1485 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1491 einfo (_("%X%P: %H: reloc refers to symbol `%pT' which is not being output\n"),
1492 abfd, section, address, name);
1495 /* This is called if link_info.notice_all is set, or when a symbol in
1496 link_info.notice_hash is found. Symbols are put in notice_hash
1497 using the -y option, while notice_all is set if the --cref option
1498 has been supplied, or if there are any NOCROSSREFS sections in the
1499 linker script; and if plugins are active, since they need to monitor
1500 all references from non-IR files. */
1503 notice (struct bfd_link_info *info,
1504 struct bfd_link_hash_entry *h,
1505 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1509 flagword flags ATTRIBUTE_UNUSED)
1515 if (command_line.cref || nocrossref_list != NULL)
1516 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1520 name = h->root.string;
1521 if (info->notice_hash != NULL
1522 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1524 if (bfd_is_und_section (section))
1525 einfo (_("%P: %pB: reference to %s\n"), abfd, name);
1527 einfo (_("%P: %pB: definition of %s\n"), abfd, name);
1530 if (command_line.cref || nocrossref_list != NULL)
1531 add_cref (name, abfd, section, value);