1 /* Main program of GNU linker.
2 Copyright (C) 1991-2017 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)
59 #ifndef TARGET_SYSTEM_ROOT
60 #define TARGET_SYSTEM_ROOT ""
65 FILE *saved_script_handle = NULL;
66 FILE *previous_script_handle = NULL;
67 bfd_boolean force_make_executable = FALSE;
70 const char *output_filename = "a.out";
72 /* Name this program was invoked by. */
75 /* The prefix for system library directories. */
76 const char *ld_sysroot;
78 /* The canonical representation of ld_sysroot. */
79 char *ld_canon_sysroot;
80 int ld_canon_sysroot_len;
82 /* Set by -G argument, for targets like MIPS ELF. */
83 int g_switch_value = 8;
85 /* Nonzero means print names of input files as processed. */
86 bfd_boolean trace_files;
88 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
91 /* Nonzero means version number was printed, so exit successfully
92 instead of complaining if no input files are given. */
93 bfd_boolean version_printed;
95 /* TRUE if we should demangle symbol names. */
96 bfd_boolean demangling;
98 args_type command_line;
100 ld_config_type config;
102 sort_type sort_section;
104 static const char *get_sysroot
106 static char *get_emulation
108 static bfd_boolean add_archive_element
109 (struct bfd_link_info *, bfd *, const char *, bfd **);
110 static void multiple_definition
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd *, asection *, bfd_vma);
113 static void multiple_common
114 (struct bfd_link_info *, struct bfd_link_hash_entry *,
115 bfd *, enum bfd_link_hash_type, bfd_vma);
116 static void add_to_set
117 (struct bfd_link_info *, struct bfd_link_hash_entry *,
118 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
119 static void constructor_callback
120 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
121 asection *, bfd_vma);
122 static void warning_callback
123 (struct bfd_link_info *, const char *, const char *, bfd *,
124 asection *, bfd_vma);
125 static void warning_find_reloc
126 (bfd *, asection *, void *);
127 static void undefined_symbol
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
130 static void reloc_overflow
131 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
132 const char *, bfd_vma, bfd *, asection *, bfd_vma);
133 static void reloc_dangerous
134 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
135 static void unattached_reloc
136 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
137 static bfd_boolean notice
138 (struct bfd_link_info *, struct bfd_link_hash_entry *,
139 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
141 static struct bfd_link_callbacks link_callbacks =
147 constructor_callback,
157 ldlang_override_segment_assignment
160 static bfd_assert_handler_type default_bfd_assert_handler;
161 static bfd_error_handler_type default_bfd_error_handler;
163 struct bfd_link_info link_info;
168 bfd_cache_close_all ();
169 #ifdef ENABLE_PLUGINS
170 plugin_call_cleanup ();
172 if (output_filename && delete_output_file_on_failure)
173 unlink_if_ordinary (output_filename);
176 /* Hook to notice BFD assertions. */
179 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
180 const char *file, int line)
182 config.make_executable = FALSE;
183 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
186 /* Hook the bfd error/warning handler for --fatal-warnings. */
189 ld_bfd_error_handler (const char *fmt, va_list ap)
191 if (config.fatal_warnings)
192 config.make_executable = FALSE;
193 (*default_bfd_error_handler) (fmt, ap);
197 main (int argc, char **argv)
200 long start_time = get_run_time ();
202 char *start_sbrk = (char *) sbrk (0);
205 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
206 setlocale (LC_MESSAGES, "");
208 #if defined (HAVE_SETLOCALE)
209 setlocale (LC_CTYPE, "");
211 bindtextdomain (PACKAGE, LOCALEDIR);
212 textdomain (PACKAGE);
214 program_name = argv[0];
215 xmalloc_set_program_name (program_name);
217 START_PROGRESS (program_name, 0);
219 expandargv (&argc, &argv);
223 bfd_set_error_program_name (program_name);
225 /* We want to notice and fail on those nasty BFD assertions which are
226 likely to signal incorrect output being generated but otherwise may
228 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
230 /* Also hook the bfd error/warning handler for --fatal-warnings. */
231 default_bfd_error_handler = bfd_set_error_handler (ld_bfd_error_handler);
233 xatexit (ld_cleanup);
235 /* Set up the sysroot directory. */
236 ld_sysroot = get_sysroot (argc, argv);
238 ld_canon_sysroot = lrealpath (ld_sysroot);
239 if (ld_canon_sysroot)
240 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
242 ld_canon_sysroot_len = -1;
244 /* Set the default BFD target based on the configured target. Doing
245 this permits the linker to be configured for a particular target,
246 and linked against a shared BFD library which was configured for
247 a different target. The macro TARGET is defined by Makefile. */
248 if (!bfd_set_default_target (TARGET))
250 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
261 config.build_constructors = TRUE;
262 config.rpath_separator = ':';
263 config.split_by_reloc = (unsigned) -1;
264 config.split_by_file = (bfd_size_type) -1;
265 config.make_executable = TRUE;
266 config.magic_demand_paged = TRUE;
267 config.text_read_only = 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.emit_hash = TRUE;
286 link_info.callbacks = &link_callbacks;
287 link_info.input_bfds_tail = &link_info.input_bfds;
288 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
289 and _fini symbols. We are compatible. */
290 link_info.init_function = "_init";
291 link_info.fini_function = "_fini";
292 link_info.relax_pass = 1;
293 link_info.extern_protected_data = -1;
294 link_info.dynamic_undefined_weak = -1;
295 link_info.pei386_auto_import = -1;
296 link_info.spare_dynamic_tags = 5;
297 link_info.path_separator = ':';
298 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
299 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
301 #ifdef DEFAULT_NEW_DTAGS
302 link_info.new_dtags = DEFAULT_NEW_DTAGS;
305 ldfile_add_arch ("");
306 emulation = get_emulation (argc, argv);
307 ldemul_choose_mode (emulation);
308 default_target = ldemul_choose_target (argc, argv);
309 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
310 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
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_command_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 (!lang_has_input_file)
409 if (version_printed || command_line.print_output_format)
411 einfo (_("%P%F: no input files\n"));
415 info_msg (_("%P: mode %s\n"), emulation);
417 ldemul_after_parse ();
419 if (config.map_filename)
421 if (strcmp (config.map_filename, "-") == 0)
423 config.map_file = stdout;
427 config.map_file = fopen (config.map_filename, FOPEN_WT);
428 if (config.map_file == (FILE *) NULL)
430 bfd_set_error (bfd_error_system_call);
431 einfo (_("%P%F: cannot open map file %s: %E\n"),
432 config.map_filename);
439 /* Print error messages for any missing symbols, for any warning
440 symbols, and possibly multiple definitions. */
441 if (bfd_link_relocatable (&link_info))
442 link_info.output_bfd->flags &= ~EXEC_P;
444 link_info.output_bfd->flags |= EXEC_P;
446 if ((link_info.compress_debug & COMPRESS_DEBUG))
448 link_info.output_bfd->flags |= BFD_COMPRESS;
449 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
450 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
455 if (config.map_file != NULL)
457 if (command_line.cref)
458 output_cref (config.map_file != NULL ? config.map_file : stdout);
459 if (nocrossref_list != NULL)
460 check_nocrossrefs ();
461 if (command_line.print_memory_usage)
462 lang_print_memory_usage ();
465 struct bfd_link_hash_entry *h;
467 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
468 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
474 /* Even if we're producing relocatable output, some non-fatal errors should
475 be reported in the exit status. (What non-fatal errors, if any, do we
476 want to ignore for relocatable output?) */
477 if (!config.make_executable && !force_make_executable)
480 einfo (_("%P: link errors found, deleting executable `%s'\n"),
483 /* The file will be removed by ld_cleanup. */
488 if (!bfd_close (link_info.output_bfd))
489 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
491 /* If the --force-exe-suffix is enabled, and we're making an
492 executable file and it doesn't end in .exe, copy it to one
494 if (!bfd_link_relocatable (&link_info)
495 && command_line.force_exe_suffix)
497 int len = strlen (output_filename);
500 || (strcasecmp (output_filename + len - 4, ".exe") != 0
501 && strcasecmp (output_filename + len - 4, ".dll") != 0))
505 const int bsize = 4096;
506 char *buf = (char *) xmalloc (bsize);
508 char *dst_name = (char *) xmalloc (len + 5);
510 strcpy (dst_name, output_filename);
511 strcat (dst_name, ".exe");
512 src = fopen (output_filename, FOPEN_RB);
513 dst = fopen (dst_name, FOPEN_WB);
516 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
519 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
521 while ((l = fread (buf, 1, bsize, src)) > 0)
523 int done = fwrite (buf, 1, l, dst);
526 einfo (_("%P: Error writing file `%s'\n"), dst_name);
530 if (fclose (dst) == EOF)
531 einfo (_("%P: Error closing file `%s'\n"), dst_name);
538 END_PROGRESS (program_name);
543 char *lim = (char *) sbrk (0);
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);
551 fprintf (stderr, _("%s: data size %ld\n"), program_name,
552 (long) (lim - start_sbrk));
557 /* Prevent ld_cleanup from doing anything, after a successful link. */
558 output_filename = NULL;
564 /* If the configured sysroot is relocatable, try relocating it based on
565 default prefix FROM. Return the relocated directory if it exists,
566 otherwise return null. */
569 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
571 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
575 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
578 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
586 /* Return the sysroot directory. Return "" if no sysroot is being used. */
589 get_sysroot (int argc, char **argv)
594 for (i = 1; i < argc; i++)
595 if (CONST_STRNEQ (argv[i], "--sysroot="))
596 return argv[i] + strlen ("--sysroot=");
598 path = get_relative_sysroot (BINDIR);
602 path = get_relative_sysroot (TOOLBINDIR);
606 return TARGET_SYSTEM_ROOT;
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 (_("%P%F: 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 (_("%P%F: bfd_hash_table_init failed: %E\n"));
688 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
689 einfo (_("%P%F: 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 (_("%P%F: bfd_hash_table_init failed: %E\n"));
705 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
706 einfo (_("%P%F: 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 (_("%P%F: bfd_hash_table_init failed: %E\n"));
725 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
726 einfo (_("%P%F: 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 (_("%P%F: 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 (_("%P%F: 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 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 /* Save the original data for trace files/tries below, as plugins
818 (if enabled) may possibly alter it to point to a replacement
819 BFD, but we still want to output the original BFD filename. */
821 #ifdef ENABLE_PLUGINS
822 if (link_info.lto_plugin_active)
824 /* We must offer this archive member to the plugins to claim. */
825 plugin_maybe_claim (input);
826 if (input->flags.claimed)
828 if (no_more_claiming)
830 /* Don't claim new IR symbols after all IR symbols have
832 if (trace_files || verbose)
833 info_msg ("%I: no new IR symbols to claimi\n",
835 input->flags.claimed = 0;
838 input->flags.claim_archive = TRUE;
839 *subsbfd = input->the_bfd;
842 #endif /* ENABLE_PLUGINS */
844 ldlang_add_file (input);
846 if (config.map_file != NULL)
848 static bfd_boolean header_printed;
849 struct bfd_link_hash_entry *h;
853 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
865 case bfd_link_hash_defined:
866 case bfd_link_hash_defweak:
867 from = h->u.def.section->owner;
870 case bfd_link_hash_undefined:
871 case bfd_link_hash_undefweak:
872 from = h->u.undef.abfd;
875 case bfd_link_hash_common:
876 from = h->u.c.p->section->owner;
883 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
884 header_printed = TRUE;
887 if (abfd->my_archive == NULL
888 || bfd_is_thin_archive (abfd->my_archive))
890 minfo ("%s", bfd_get_filename (abfd));
891 len = strlen (bfd_get_filename (abfd));
895 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
896 bfd_get_filename (abfd));
897 len = (strlen (bfd_get_filename (abfd->my_archive))
898 + strlen (bfd_get_filename (abfd))
916 minfo ("(%T)\n", h->root.string);
918 minfo ("(%s)\n", name);
921 if (trace_files || verbose)
922 info_msg ("%I\n", &orig_input);
926 /* This is called when BFD has discovered a symbol which is defined
930 multiple_definition (struct bfd_link_info *info,
931 struct bfd_link_hash_entry *h,
941 if (info->allow_multiple_definition)
946 case bfd_link_hash_defined:
947 osec = h->u.def.section;
948 oval = h->u.def.value;
949 obfd = h->u.def.section->owner;
951 case bfd_link_hash_indirect:
952 osec = bfd_ind_section_ptr;
960 /* Ignore a redefinition of an absolute symbol to the
961 same value; it's harmless. */
962 if (h->type == bfd_link_hash_defined
963 && bfd_is_abs_section (osec)
964 && bfd_is_abs_section (nsec)
968 /* If either section has the output_section field set to
969 bfd_abs_section_ptr, it means that the section is being
970 discarded, and this is not really a multiple definition at all.
971 FIXME: It would be cleaner to somehow ignore symbols defined in
972 sections which are being discarded. */
973 if ((osec->output_section != NULL
974 && !bfd_is_abs_section (osec)
975 && bfd_is_abs_section (osec->output_section))
976 || (nsec->output_section != NULL
977 && !bfd_is_abs_section (nsec)
978 && bfd_is_abs_section (nsec->output_section)))
981 name = h->root.string;
989 einfo (_("%X%C: multiple definition of `%T'\n"),
990 nbfd, nsec, nval, name);
992 einfo (_("%D: first defined here\n"), obfd, osec, oval);
994 if (RELAXATION_ENABLED_BY_USER)
996 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1001 /* This is called when there is a definition of a common symbol, or
1002 when a common symbol is found for a symbol that is already defined,
1003 or when two common symbols are found. We only do something if
1004 -warn-common was used. */
1007 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1008 struct bfd_link_hash_entry *h,
1010 enum bfd_link_hash_type ntype,
1015 enum bfd_link_hash_type otype;
1018 if (!config.warn_common)
1021 name = h->root.string;
1023 if (otype == bfd_link_hash_common)
1025 obfd = h->u.c.p->section->owner;
1026 osize = h->u.c.size;
1028 else if (otype == bfd_link_hash_defined
1029 || otype == bfd_link_hash_defweak)
1031 obfd = h->u.def.section->owner;
1036 /* FIXME: It would nice if we could report the BFD which defined
1037 an indirect symbol, but we don't have anywhere to store the
1043 if (ntype == bfd_link_hash_defined
1044 || ntype == bfd_link_hash_defweak
1045 || ntype == bfd_link_hash_indirect)
1047 ASSERT (otype == bfd_link_hash_common);
1048 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1051 einfo (_("%B: warning: common is here\n"), obfd);
1053 else if (otype == bfd_link_hash_defined
1054 || otype == bfd_link_hash_defweak
1055 || otype == bfd_link_hash_indirect)
1057 ASSERT (ntype == bfd_link_hash_common);
1058 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1061 einfo (_("%B: warning: defined here\n"), obfd);
1065 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1068 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1071 einfo (_("%B: warning: larger common is here\n"), obfd);
1073 else if (nsize > osize)
1075 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1078 einfo (_("%B: warning: smaller common is here\n"), obfd);
1082 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1084 einfo (_("%B: warning: previous common is here\n"), obfd);
1089 /* This is called when BFD has discovered a set element. H is the
1090 entry in the linker hash table for the set. SECTION and VALUE
1091 represent a value which should be added to the set. */
1094 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1095 struct bfd_link_hash_entry *h,
1096 bfd_reloc_code_real_type reloc,
1101 if (config.warn_constructors)
1102 einfo (_("%P: warning: global constructor %s used\n"),
1105 if (!config.build_constructors)
1108 ldctor_add_set_entry (h, reloc, NULL, section, value);
1110 if (h->type == bfd_link_hash_new)
1112 h->type = bfd_link_hash_undefined;
1113 h->u.undef.abfd = abfd;
1114 /* We don't call bfd_link_add_undef to add this to the list of
1115 undefined symbols because we are going to define it
1120 /* This is called when BFD has discovered a constructor. This is only
1121 called for some object file formats--those which do not handle
1122 constructors in some more clever fashion. This is similar to
1123 adding an element to a set, but less general. */
1126 constructor_callback (struct bfd_link_info *info,
1127 bfd_boolean constructor,
1134 struct bfd_link_hash_entry *h;
1135 char set_name[1 + sizeof "__CTOR_LIST__"];
1137 if (config.warn_constructors)
1138 einfo (_("%P: warning: global constructor %s used\n"), name);
1140 if (!config.build_constructors)
1143 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1144 useful error message. */
1145 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1146 && (bfd_link_relocatable (info)
1147 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1148 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1151 if (bfd_get_symbol_leading_char (abfd) != '\0')
1152 *s++ = bfd_get_symbol_leading_char (abfd);
1154 strcpy (s, "__CTOR_LIST__");
1156 strcpy (s, "__DTOR_LIST__");
1158 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1159 if (h == (struct bfd_link_hash_entry *) NULL)
1160 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1161 if (h->type == bfd_link_hash_new)
1163 h->type = bfd_link_hash_undefined;
1164 h->u.undef.abfd = abfd;
1165 /* We don't call bfd_link_add_undef to add this to the list of
1166 undefined symbols because we are going to define it
1170 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1173 /* A structure used by warning_callback to pass information through
1174 bfd_map_over_sections. */
1176 struct warning_callback_info
1179 const char *warning;
1184 /* Look through the relocs to see if we can find a plausible address
1185 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1188 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1190 struct warning_callback_info cinfo;
1192 if (!bfd_generic_link_read_symbols (abfd))
1193 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1195 cinfo.found = FALSE;
1196 cinfo.warning = warning;
1197 cinfo.symbol = symbol;
1198 cinfo.asymbols = bfd_get_outsymbols (abfd);
1199 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1203 /* This is called when there is a reference to a warning symbol. */
1206 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1207 const char *warning,
1213 /* This is a hack to support warn_multiple_gp. FIXME: This should
1214 have a cleaner interface, but what? */
1215 if (!config.warn_multiple_gp
1216 && strcmp (warning, "using multiple gp values") == 0)
1219 if (section != NULL)
1220 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1221 else if (abfd == NULL)
1222 einfo ("%P: %s%s\n", _("warning: "), warning);
1223 else if (symbol == NULL)
1224 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1225 else if (!symbol_warning (warning, symbol, abfd))
1228 /* Search all input files for a reference to SYMBOL. */
1229 for (b = info->input_bfds; b; b = b->link.next)
1230 if (b != abfd && symbol_warning (warning, symbol, b))
1232 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1236 /* This is called by warning_callback for each section. It checks the
1237 relocs of the section to see if it can find a reference to the
1238 symbol which triggered the warning. If it can, it uses the reloc
1239 to give an error message with a file and line number. */
1242 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1244 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1248 arelent **p, **pend;
1253 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1255 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1259 relpp = (arelent **) xmalloc (relsize);
1260 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1262 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1265 pend = p + relcount;
1266 for (; p < pend && *p != NULL; p++)
1270 if (q->sym_ptr_ptr != NULL
1271 && *q->sym_ptr_ptr != NULL
1272 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1274 /* We found a reloc for the symbol we are looking for. */
1275 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1285 /* This is called when an undefined symbol is found. */
1288 undefined_symbol (struct bfd_link_info *info,
1295 static char *error_name;
1296 static unsigned int error_count;
1298 #define MAX_ERRORS_IN_A_ROW 5
1300 if (info->ignore_hash != NULL
1301 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1304 if (config.warn_once)
1306 /* Only warn once about a particular undefined symbol. */
1307 add_ignoresym (info, name);
1310 /* We never print more than a reasonable number of errors in a row
1311 for a single symbol. */
1312 if (error_name != NULL
1313 && strcmp (name, error_name) == 0)
1318 if (error_name != NULL)
1320 error_name = xstrdup (name);
1323 if (section != NULL)
1325 if (error_count < MAX_ERRORS_IN_A_ROW)
1328 einfo (_("%X%C: undefined reference to `%T'\n"),
1329 abfd, section, address, name);
1331 einfo (_("%C: warning: undefined reference to `%T'\n"),
1332 abfd, section, address, name);
1334 else if (error_count == MAX_ERRORS_IN_A_ROW)
1337 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1338 abfd, section, address, name);
1340 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1341 abfd, section, address, name);
1348 if (error_count < MAX_ERRORS_IN_A_ROW)
1351 einfo (_("%X%B: undefined reference to `%T'\n"),
1354 einfo (_("%B: warning: undefined reference to `%T'\n"),
1357 else if (error_count == MAX_ERRORS_IN_A_ROW)
1360 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1363 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1371 /* Counter to limit the number of relocation overflow error messages
1372 to print. Errors are printed as it is decremented. When it's
1373 called and the counter is zero, a final message is printed
1374 indicating more relocations were omitted. When it gets to -1, no
1375 such errors are printed. If it's initially set to a value less
1376 than -1, all such errors will be printed (--verbose does this). */
1378 int overflow_cutoff_limit = 10;
1380 /* This is called when a reloc overflows. */
1383 reloc_overflow (struct bfd_link_info *info,
1384 struct bfd_link_hash_entry *entry,
1386 const char *reloc_name,
1392 if (overflow_cutoff_limit == -1)
1395 einfo ("%X%H:", abfd, section, address);
1397 if (overflow_cutoff_limit >= 0
1398 && overflow_cutoff_limit-- == 0)
1400 einfo (_(" additional relocation overflows omitted from the output\n"));
1406 while (entry->type == bfd_link_hash_indirect
1407 || entry->type == bfd_link_hash_warning)
1408 entry = entry->u.i.link;
1409 switch (entry->type)
1411 case bfd_link_hash_undefined:
1412 case bfd_link_hash_undefweak:
1413 einfo (_(" relocation truncated to fit: "
1414 "%s against undefined symbol `%T'"),
1415 reloc_name, entry->root.string);
1417 case bfd_link_hash_defined:
1418 case bfd_link_hash_defweak:
1419 einfo (_(" relocation truncated to fit: "
1420 "%s against symbol `%T' defined in %A section in %B"),
1421 reloc_name, entry->root.string,
1422 entry->u.def.section,
1423 entry->u.def.section == bfd_abs_section_ptr
1424 ? info->output_bfd : entry->u.def.section->owner);
1432 einfo (_(" relocation truncated to fit: %s against `%T'"),
1435 einfo ("+%v", addend);
1439 /* This is called when a dangerous relocation is made. */
1442 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1443 const char *message,
1448 einfo (_("%X%H: dangerous relocation: %s\n"),
1449 abfd, section, address, message);
1452 /* This is called when a reloc is being generated attached to a symbol
1453 that is not being output. */
1456 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1462 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1463 abfd, section, address, name);
1466 /* This is called if link_info.notice_all is set, or when a symbol in
1467 link_info.notice_hash is found. Symbols are put in notice_hash
1468 using the -y option, while notice_all is set if the --cref option
1469 has been supplied, or if there are any NOCROSSREFS sections in the
1470 linker script; and if plugins are active, since they need to monitor
1471 all references from non-IR files. */
1474 notice (struct bfd_link_info *info,
1475 struct bfd_link_hash_entry *h,
1476 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1480 flagword flags ATTRIBUTE_UNUSED)
1486 if (command_line.cref || nocrossref_list != NULL)
1487 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1491 name = h->root.string;
1492 if (info->notice_hash != NULL
1493 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1495 if (bfd_is_und_section (section))
1496 einfo ("%B: reference to %s\n", abfd, name);
1498 einfo ("%B: definition of %s\n", abfd, name);
1501 if (command_line.cref || nocrossref_list != NULL)
1502 add_cref (name, abfd, section, value);