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)
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 bfd_boolean 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);
214 bfd_set_error_program_name (program_name);
216 /* We want to notice and fail on those nasty BFD assertions which are
217 likely to signal incorrect output being generated but otherwise may
219 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
221 /* Also hook the bfd error/warning handler for --fatal-warnings. */
222 default_bfd_error_handler = bfd_set_error_handler (ld_bfd_error_handler);
224 xatexit (ld_cleanup);
226 /* Set up the sysroot directory. */
227 ld_sysroot = get_sysroot (argc, argv);
229 ld_canon_sysroot = lrealpath (ld_sysroot);
230 if (ld_canon_sysroot)
231 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
233 ld_canon_sysroot_len = -1;
235 /* Set the default BFD target based on the configured target. Doing
236 this permits the linker to be configured for a particular target,
237 and linked against a shared BFD library which was configured for
238 a different target. The macro TARGET is defined by Makefile. */
239 if (!bfd_set_default_target (TARGET))
241 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
252 config.build_constructors = TRUE;
253 config.rpath_separator = ':';
254 config.split_by_reloc = (unsigned) -1;
255 config.split_by_file = (bfd_size_type) -1;
256 config.make_executable = TRUE;
257 config.magic_demand_paged = TRUE;
258 config.text_read_only = TRUE;
259 link_info.disable_target_specific_optimizations = -1;
261 command_line.warn_mismatch = TRUE;
262 command_line.warn_search_mismatch = TRUE;
263 command_line.check_section_addresses = -1;
265 /* We initialize DEMANGLING based on the environment variable
266 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
267 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
268 environment. Acting the same way here lets us provide the same
269 interface by default. */
270 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
272 link_info.allow_undefined_version = TRUE;
273 link_info.keep_memory = TRUE;
274 link_info.combreloc = TRUE;
275 link_info.strip_discarded = TRUE;
276 link_info.emit_hash = TRUE;
277 link_info.callbacks = &link_callbacks;
278 link_info.input_bfds_tail = &link_info.input_bfds;
279 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
280 and _fini symbols. We are compatible. */
281 link_info.init_function = "_init";
282 link_info.fini_function = "_fini";
283 link_info.relax_pass = 1;
284 link_info.extern_protected_data = -1;
285 link_info.dynamic_undefined_weak = -1;
286 link_info.pei386_auto_import = -1;
287 link_info.spare_dynamic_tags = 5;
288 link_info.path_separator = ':';
289 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
290 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
292 #ifdef DEFAULT_NEW_DTAGS
293 link_info.new_dtags = DEFAULT_NEW_DTAGS;
296 ldfile_add_arch ("");
297 emulation = get_emulation (argc, argv);
298 ldemul_choose_mode (emulation);
299 default_target = ldemul_choose_target (argc, argv);
300 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
301 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
304 ldemul_before_parse ();
305 lang_has_input_file = FALSE;
306 parse_args (argc, argv);
308 if (config.hash_table_size != 0)
309 bfd_hash_set_default_size (config.hash_table_size);
311 #ifdef ENABLE_PLUGINS
312 /* Now all the plugin arguments have been gathered, we can load them. */
313 plugin_load_plugins ();
314 #endif /* ENABLE_PLUGINS */
316 ldemul_set_symbols ();
318 /* If we have not already opened and parsed a linker script,
319 try the default script from command line first. */
320 if (saved_script_handle == NULL
321 && command_line.default_script != NULL)
323 ldfile_open_command_file (command_line.default_script);
324 parser_input = input_script;
328 /* If we have not already opened and parsed a linker script
329 read the emulation's appropriate default script. */
330 if (saved_script_handle == NULL)
333 char *s = ldemul_get_script (&isfile);
336 ldfile_open_default_command_file (s);
340 lex_redirect (s, _("built in linker script"), 1);
342 parser_input = input_script;
349 if (saved_script_handle)
350 info_msg (_("using external linker script:"));
352 info_msg (_("using internal linker script:"));
353 info_msg ("\n==================================================\n");
355 if (saved_script_handle)
357 static const int ld_bufsz = 8193;
359 char *buf = (char *) xmalloc (ld_bufsz);
361 rewind (saved_script_handle);
362 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
365 info_msg ("%s", buf);
367 rewind (saved_script_handle);
374 info_msg (ldemul_get_script (&isfile));
377 info_msg ("\n==================================================\n");
380 if (command_line.force_group_allocation
381 || !bfd_link_relocatable (&link_info))
382 link_info.resolve_section_groups = TRUE;
384 link_info.resolve_section_groups = FALSE;
386 if (command_line.print_output_format)
387 info_msg ("%s\n", lang_get_output_target ());
391 /* If the only command line argument has been -v or --version or --verbose
392 then ignore any input files provided by linker scripts and exit now.
393 We do not want to create an output file when the linker is just invoked
394 to provide version information. */
395 if (argc == 2 && version_printed)
398 if (link_info.inhibit_common_definition && !bfd_link_dll (&link_info))
399 einfo (_("%P%F: --no-define-common may not be used without -shared\n"));
401 if (!lang_has_input_file)
403 if (version_printed || command_line.print_output_format)
405 einfo (_("%P%F: no input files\n"));
409 info_msg (_("%P: mode %s\n"), emulation);
411 ldemul_after_parse ();
413 if (config.map_filename)
415 if (strcmp (config.map_filename, "-") == 0)
417 config.map_file = stdout;
421 config.map_file = fopen (config.map_filename, FOPEN_WT);
422 if (config.map_file == (FILE *) NULL)
424 bfd_set_error (bfd_error_system_call);
425 einfo (_("%P%F: cannot open map file %s: %E\n"),
426 config.map_filename);
433 /* Print error messages for any missing symbols, for any warning
434 symbols, and possibly multiple definitions. */
435 if (bfd_link_relocatable (&link_info))
436 link_info.output_bfd->flags &= ~EXEC_P;
438 link_info.output_bfd->flags |= EXEC_P;
440 if ((link_info.compress_debug & COMPRESS_DEBUG))
442 link_info.output_bfd->flags |= BFD_COMPRESS;
443 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
444 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
449 if (config.map_file != NULL)
451 if (command_line.cref)
452 output_cref (config.map_file != NULL ? config.map_file : stdout);
453 if (nocrossref_list != NULL)
454 check_nocrossrefs ();
455 if (command_line.print_memory_usage)
456 lang_print_memory_usage ();
459 struct bfd_link_hash_entry *h;
461 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
462 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
468 /* Even if we're producing relocatable output, some non-fatal errors should
469 be reported in the exit status. (What non-fatal errors, if any, do we
470 want to ignore for relocatable output?) */
471 if (!config.make_executable && !force_make_executable)
474 einfo (_("%P: link errors found, deleting executable `%s'\n"),
477 /* The file will be removed by ld_cleanup. */
482 if (!bfd_close (link_info.output_bfd))
483 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
485 /* If the --force-exe-suffix is enabled, and we're making an
486 executable file and it doesn't end in .exe, copy it to one
488 if (!bfd_link_relocatable (&link_info)
489 && command_line.force_exe_suffix)
491 int len = strlen (output_filename);
494 || (strcasecmp (output_filename + len - 4, ".exe") != 0
495 && strcasecmp (output_filename + len - 4, ".dll") != 0))
499 const int bsize = 4096;
500 char *buf = (char *) xmalloc (bsize);
502 char *dst_name = (char *) xmalloc (len + 5);
504 strcpy (dst_name, output_filename);
505 strcat (dst_name, ".exe");
506 src = fopen (output_filename, FOPEN_RB);
507 dst = fopen (dst_name, FOPEN_WB);
510 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
513 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
515 while ((l = fread (buf, 1, bsize, src)) > 0)
517 int done = fwrite (buf, 1, l, dst);
520 einfo (_("%P: Error writing file `%s'\n"), dst_name);
524 if (fclose (dst) == EOF)
525 einfo (_("%P: Error closing file `%s'\n"), dst_name);
532 END_PROGRESS (program_name);
536 long run_time = get_run_time () - start_time;
539 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
540 program_name, run_time / 1000000, run_time % 1000000);
544 /* Prevent ld_cleanup from doing anything, after a successful link. */
545 output_filename = NULL;
551 /* If the configured sysroot is relocatable, try relocating it based on
552 default prefix FROM. Return the relocated directory if it exists,
553 otherwise return null. */
556 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
558 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
562 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
565 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
573 /* Return the sysroot directory. Return "" if no sysroot is being used. */
576 get_sysroot (int argc, char **argv)
581 for (i = 1; i < argc; i++)
582 if (CONST_STRNEQ (argv[i], "--sysroot="))
583 return argv[i] + strlen ("--sysroot=");
585 path = get_relative_sysroot (BINDIR);
589 path = get_relative_sysroot (TOOLBINDIR);
593 return TARGET_SYSTEM_ROOT;
596 /* We need to find any explicitly given emulation in order to initialize the
597 state that's needed by the lex&yacc argument parser (parse_args). */
600 get_emulation (int argc, char **argv)
605 emulation = getenv (EMULATION_ENVIRON);
606 if (emulation == NULL)
607 emulation = DEFAULT_EMULATION;
609 for (i = 1; i < argc; i++)
611 if (CONST_STRNEQ (argv[i], "-m"))
613 if (argv[i][2] == '\0')
618 emulation = argv[i + 1];
622 einfo (_("%P%F: missing argument to -m\n"));
624 else if (strcmp (argv[i], "-mips1") == 0
625 || strcmp (argv[i], "-mips2") == 0
626 || strcmp (argv[i], "-mips3") == 0
627 || strcmp (argv[i], "-mips4") == 0
628 || strcmp (argv[i], "-mips5") == 0
629 || strcmp (argv[i], "-mips32") == 0
630 || strcmp (argv[i], "-mips32r2") == 0
631 || strcmp (argv[i], "-mips32r6") == 0
632 || strcmp (argv[i], "-mips64") == 0
633 || strcmp (argv[i], "-mips64r2") == 0
634 || strcmp (argv[i], "-mips64r6") == 0)
636 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
637 passed to the linker by some MIPS compilers. They
638 generally tell the linker to use a slightly different
639 library path. Perhaps someday these should be
640 implemented as emulations; until then, we just ignore
641 the arguments and hope that nobody ever creates
642 emulations named ips1, ips2 or ips3. */
644 else if (strcmp (argv[i], "-m486") == 0)
646 /* FIXME: The argument -m486 is passed to the linker on
647 some Linux systems. Hope that nobody creates an
648 emulation named 486. */
653 emulation = &argv[i][2];
662 add_ysym (const char *name)
664 if (link_info.notice_hash == NULL)
666 link_info.notice_hash
667 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
668 if (!bfd_hash_table_init_n (link_info.notice_hash,
670 sizeof (struct bfd_hash_entry),
672 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
675 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
676 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
680 add_ignoresym (struct bfd_link_info *info, const char *name)
682 if (info->ignore_hash == NULL)
684 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
685 if (!bfd_hash_table_init_n (info->ignore_hash,
687 sizeof (struct bfd_hash_entry),
689 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
692 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
693 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
696 /* Record a symbol to be wrapped, from the --wrap option. */
699 add_wrap (const char *name)
701 if (link_info.wrap_hash == NULL)
704 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
705 if (!bfd_hash_table_init_n (link_info.wrap_hash,
707 sizeof (struct bfd_hash_entry),
709 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
712 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
713 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
716 /* Handle the -retain-symbols-file option. */
719 add_keepsyms_file (const char *filename)
726 if (link_info.strip == strip_some)
727 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
729 file = fopen (filename, "r");
732 bfd_set_error (bfd_error_system_call);
733 einfo ("%X%P: %s: %E\n", filename);
737 link_info.keep_hash = (struct bfd_hash_table *)
738 xmalloc (sizeof (struct bfd_hash_table));
739 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
740 sizeof (struct bfd_hash_entry)))
741 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
744 buf = (char *) xmalloc (bufsize);
756 while (!ISSPACE (c) && c != EOF)
763 buf = (char *) xrealloc (buf, bufsize);
770 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
771 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
775 if (link_info.strip != strip_none)
776 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
779 link_info.strip = strip_some;
783 /* Callbacks from the BFD linker routines. */
785 /* This is called when BFD has decided to include an archive member in
789 add_archive_element (struct bfd_link_info *info,
792 bfd **subsbfd ATTRIBUTE_UNUSED)
794 lang_input_statement_type *input;
795 lang_input_statement_type orig_input;
797 input = (lang_input_statement_type *)
798 xcalloc (1, sizeof (lang_input_statement_type));
799 input->header.type = lang_input_statement_enum;
800 input->filename = abfd->filename;
801 input->local_sym_name = abfd->filename;
802 input->the_bfd = abfd;
804 /* Save the original data for trace files/tries below, as plugins
805 (if enabled) may possibly alter it to point to a replacement
806 BFD, but we still want to output the original BFD filename. */
808 #ifdef ENABLE_PLUGINS
809 if (link_info.lto_plugin_active)
811 /* We must offer this archive member to the plugins to claim. */
812 plugin_maybe_claim (input);
813 if (input->flags.claimed)
815 if (no_more_claiming)
817 /* Don't claim new IR symbols after all IR symbols have
819 if (trace_files || verbose)
820 info_msg ("%I: no new IR symbols to claimi\n",
822 input->flags.claimed = 0;
825 input->flags.claim_archive = TRUE;
826 *subsbfd = input->the_bfd;
829 #endif /* ENABLE_PLUGINS */
831 ldlang_add_file (input);
833 if (config.map_file != NULL)
835 static bfd_boolean header_printed;
836 struct bfd_link_hash_entry *h;
840 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
852 case bfd_link_hash_defined:
853 case bfd_link_hash_defweak:
854 from = h->u.def.section->owner;
857 case bfd_link_hash_undefined:
858 case bfd_link_hash_undefweak:
859 from = h->u.undef.abfd;
862 case bfd_link_hash_common:
863 from = h->u.c.p->section->owner;
870 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
871 header_printed = TRUE;
874 if (abfd->my_archive == NULL
875 || bfd_is_thin_archive (abfd->my_archive))
877 minfo ("%s", bfd_get_filename (abfd));
878 len = strlen (bfd_get_filename (abfd));
882 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
883 bfd_get_filename (abfd));
884 len = (strlen (bfd_get_filename (abfd->my_archive))
885 + strlen (bfd_get_filename (abfd))
903 minfo ("(%T)\n", h->root.string);
905 minfo ("(%s)\n", name);
908 if (trace_files || verbose)
909 info_msg ("%I\n", &orig_input);
913 /* This is called when BFD has discovered a symbol which is defined
917 multiple_definition (struct bfd_link_info *info,
918 struct bfd_link_hash_entry *h,
928 if (info->allow_multiple_definition)
933 case bfd_link_hash_defined:
934 osec = h->u.def.section;
935 oval = h->u.def.value;
936 obfd = h->u.def.section->owner;
938 case bfd_link_hash_indirect:
939 osec = bfd_ind_section_ptr;
947 /* Ignore a redefinition of an absolute symbol to the
948 same value; it's harmless. */
949 if (h->type == bfd_link_hash_defined
950 && bfd_is_abs_section (osec)
951 && bfd_is_abs_section (nsec)
955 /* If either section has the output_section field set to
956 bfd_abs_section_ptr, it means that the section is being
957 discarded, and this is not really a multiple definition at all.
958 FIXME: It would be cleaner to somehow ignore symbols defined in
959 sections which are being discarded. */
960 if ((osec->output_section != NULL
961 && !bfd_is_abs_section (osec)
962 && bfd_is_abs_section (osec->output_section))
963 || (nsec->output_section != NULL
964 && !bfd_is_abs_section (nsec)
965 && bfd_is_abs_section (nsec->output_section)))
968 name = h->root.string;
976 einfo (_("%X%C: multiple definition of `%T'\n"),
977 nbfd, nsec, nval, name);
979 einfo (_("%D: first defined here\n"), obfd, osec, oval);
981 if (RELAXATION_ENABLED_BY_USER)
983 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
988 /* This is called when there is a definition of a common symbol, or
989 when a common symbol is found for a symbol that is already defined,
990 or when two common symbols are found. We only do something if
991 -warn-common was used. */
994 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
995 struct bfd_link_hash_entry *h,
997 enum bfd_link_hash_type ntype,
1002 enum bfd_link_hash_type otype;
1005 if (!config.warn_common)
1008 name = h->root.string;
1010 if (otype == bfd_link_hash_common)
1012 obfd = h->u.c.p->section->owner;
1013 osize = h->u.c.size;
1015 else if (otype == bfd_link_hash_defined
1016 || otype == bfd_link_hash_defweak)
1018 obfd = h->u.def.section->owner;
1023 /* FIXME: It would nice if we could report the BFD which defined
1024 an indirect symbol, but we don't have anywhere to store the
1030 if (ntype == bfd_link_hash_defined
1031 || ntype == bfd_link_hash_defweak
1032 || ntype == bfd_link_hash_indirect)
1034 ASSERT (otype == bfd_link_hash_common);
1035 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1038 einfo (_("%B: warning: common is here\n"), obfd);
1040 else if (otype == bfd_link_hash_defined
1041 || otype == bfd_link_hash_defweak
1042 || otype == bfd_link_hash_indirect)
1044 ASSERT (ntype == bfd_link_hash_common);
1045 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1048 einfo (_("%B: warning: defined here\n"), obfd);
1052 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1055 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1058 einfo (_("%B: warning: larger common is here\n"), obfd);
1060 else if (nsize > osize)
1062 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1065 einfo (_("%B: warning: smaller common is here\n"), obfd);
1069 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1071 einfo (_("%B: warning: previous common is here\n"), obfd);
1076 /* This is called when BFD has discovered a set element. H is the
1077 entry in the linker hash table for the set. SECTION and VALUE
1078 represent a value which should be added to the set. */
1081 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1082 struct bfd_link_hash_entry *h,
1083 bfd_reloc_code_real_type reloc,
1088 if (config.warn_constructors)
1089 einfo (_("%P: warning: global constructor %s used\n"),
1092 if (!config.build_constructors)
1095 ldctor_add_set_entry (h, reloc, NULL, section, value);
1097 if (h->type == bfd_link_hash_new)
1099 h->type = bfd_link_hash_undefined;
1100 h->u.undef.abfd = abfd;
1101 /* We don't call bfd_link_add_undef to add this to the list of
1102 undefined symbols because we are going to define it
1107 /* This is called when BFD has discovered a constructor. This is only
1108 called for some object file formats--those which do not handle
1109 constructors in some more clever fashion. This is similar to
1110 adding an element to a set, but less general. */
1113 constructor_callback (struct bfd_link_info *info,
1114 bfd_boolean constructor,
1121 struct bfd_link_hash_entry *h;
1122 char set_name[1 + sizeof "__CTOR_LIST__"];
1124 if (config.warn_constructors)
1125 einfo (_("%P: warning: global constructor %s used\n"), name);
1127 if (!config.build_constructors)
1130 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1131 useful error message. */
1132 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1133 && (bfd_link_relocatable (info)
1134 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1135 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1138 if (bfd_get_symbol_leading_char (abfd) != '\0')
1139 *s++ = bfd_get_symbol_leading_char (abfd);
1141 strcpy (s, "__CTOR_LIST__");
1143 strcpy (s, "__DTOR_LIST__");
1145 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1146 if (h == (struct bfd_link_hash_entry *) NULL)
1147 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1148 if (h->type == bfd_link_hash_new)
1150 h->type = bfd_link_hash_undefined;
1151 h->u.undef.abfd = abfd;
1152 /* We don't call bfd_link_add_undef to add this to the list of
1153 undefined symbols because we are going to define it
1157 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1160 /* A structure used by warning_callback to pass information through
1161 bfd_map_over_sections. */
1163 struct warning_callback_info
1166 const char *warning;
1171 /* Look through the relocs to see if we can find a plausible address
1172 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1175 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1177 struct warning_callback_info cinfo;
1179 if (!bfd_generic_link_read_symbols (abfd))
1180 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1182 cinfo.found = FALSE;
1183 cinfo.warning = warning;
1184 cinfo.symbol = symbol;
1185 cinfo.asymbols = bfd_get_outsymbols (abfd);
1186 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1190 /* This is called when there is a reference to a warning symbol. */
1193 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1194 const char *warning,
1200 /* This is a hack to support warn_multiple_gp. FIXME: This should
1201 have a cleaner interface, but what? */
1202 if (!config.warn_multiple_gp
1203 && strcmp (warning, "using multiple gp values") == 0)
1206 if (section != NULL)
1207 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1208 else if (abfd == NULL)
1209 einfo ("%P: %s%s\n", _("warning: "), warning);
1210 else if (symbol == NULL)
1211 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1212 else if (!symbol_warning (warning, symbol, abfd))
1215 /* Search all input files for a reference to SYMBOL. */
1216 for (b = info->input_bfds; b; b = b->link.next)
1217 if (b != abfd && symbol_warning (warning, symbol, b))
1219 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1223 /* This is called by warning_callback for each section. It checks the
1224 relocs of the section to see if it can find a reference to the
1225 symbol which triggered the warning. If it can, it uses the reloc
1226 to give an error message with a file and line number. */
1229 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1231 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1235 arelent **p, **pend;
1240 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1242 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1246 relpp = (arelent **) xmalloc (relsize);
1247 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1249 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1252 pend = p + relcount;
1253 for (; p < pend && *p != NULL; p++)
1257 if (q->sym_ptr_ptr != NULL
1258 && *q->sym_ptr_ptr != NULL
1259 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1261 /* We found a reloc for the symbol we are looking for. */
1262 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1272 /* This is called when an undefined symbol is found. */
1275 undefined_symbol (struct bfd_link_info *info,
1282 static char *error_name;
1283 static unsigned int error_count;
1285 #define MAX_ERRORS_IN_A_ROW 5
1287 if (info->ignore_hash != NULL
1288 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1291 if (config.warn_once)
1293 /* Only warn once about a particular undefined symbol. */
1294 add_ignoresym (info, name);
1297 /* We never print more than a reasonable number of errors in a row
1298 for a single symbol. */
1299 if (error_name != NULL
1300 && strcmp (name, error_name) == 0)
1305 if (error_name != NULL)
1307 error_name = xstrdup (name);
1310 if (section != NULL)
1312 if (error_count < MAX_ERRORS_IN_A_ROW)
1315 einfo (_("%X%C: undefined reference to `%T'\n"),
1316 abfd, section, address, name);
1318 einfo (_("%C: warning: undefined reference to `%T'\n"),
1319 abfd, section, address, name);
1321 else if (error_count == MAX_ERRORS_IN_A_ROW)
1324 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1325 abfd, section, address, name);
1327 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1328 abfd, section, address, name);
1335 if (error_count < MAX_ERRORS_IN_A_ROW)
1338 einfo (_("%X%B: undefined reference to `%T'\n"),
1341 einfo (_("%B: warning: undefined reference to `%T'\n"),
1344 else if (error_count == MAX_ERRORS_IN_A_ROW)
1347 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1350 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1358 /* Counter to limit the number of relocation overflow error messages
1359 to print. Errors are printed as it is decremented. When it's
1360 called and the counter is zero, a final message is printed
1361 indicating more relocations were omitted. When it gets to -1, no
1362 such errors are printed. If it's initially set to a value less
1363 than -1, all such errors will be printed (--verbose does this). */
1365 int overflow_cutoff_limit = 10;
1367 /* This is called when a reloc overflows. */
1370 reloc_overflow (struct bfd_link_info *info,
1371 struct bfd_link_hash_entry *entry,
1373 const char *reloc_name,
1379 if (overflow_cutoff_limit == -1)
1382 einfo ("%X%H:", abfd, section, address);
1384 if (overflow_cutoff_limit >= 0
1385 && overflow_cutoff_limit-- == 0)
1387 einfo (_(" additional relocation overflows omitted from the output\n"));
1393 while (entry->type == bfd_link_hash_indirect
1394 || entry->type == bfd_link_hash_warning)
1395 entry = entry->u.i.link;
1396 switch (entry->type)
1398 case bfd_link_hash_undefined:
1399 case bfd_link_hash_undefweak:
1400 einfo (_(" relocation truncated to fit: "
1401 "%s against undefined symbol `%T'"),
1402 reloc_name, entry->root.string);
1404 case bfd_link_hash_defined:
1405 case bfd_link_hash_defweak:
1406 einfo (_(" relocation truncated to fit: "
1407 "%s against symbol `%T' defined in %A section in %B"),
1408 reloc_name, entry->root.string,
1409 entry->u.def.section,
1410 entry->u.def.section == bfd_abs_section_ptr
1411 ? info->output_bfd : entry->u.def.section->owner);
1419 einfo (_(" relocation truncated to fit: %s against `%T'"),
1422 einfo ("+%v", addend);
1426 /* This is called when a dangerous relocation is made. */
1429 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1430 const char *message,
1435 einfo (_("%X%H: dangerous relocation: %s\n"),
1436 abfd, section, address, message);
1439 /* This is called when a reloc is being generated attached to a symbol
1440 that is not being output. */
1443 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1449 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1450 abfd, section, address, name);
1453 /* This is called if link_info.notice_all is set, or when a symbol in
1454 link_info.notice_hash is found. Symbols are put in notice_hash
1455 using the -y option, while notice_all is set if the --cref option
1456 has been supplied, or if there are any NOCROSSREFS sections in the
1457 linker script; and if plugins are active, since they need to monitor
1458 all references from non-IR files. */
1461 notice (struct bfd_link_info *info,
1462 struct bfd_link_hash_entry *h,
1463 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1467 flagword flags ATTRIBUTE_UNUSED)
1473 if (command_line.cref || nocrossref_list != NULL)
1474 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1478 name = h->root.string;
1479 if (info->notice_hash != NULL
1480 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1482 if (bfd_is_und_section (section))
1483 einfo ("%B: reference to %s\n", abfd, name);
1485 einfo ("%B: definition of %s\n", abfd, name);
1488 if (command_line.cref || nocrossref_list != NULL)
1489 add_cref (name, abfd, section, value);