1 /* Main program of GNU linker.
2 Copyright (C) 1991-2014 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"
45 #endif /* ENABLE_PLUGINS */
47 /* Somewhere above, sys/stat.h got included. */
48 #if !defined(S_ISDIR) && defined(S_IFDIR)
49 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
60 #ifndef TARGET_SYSTEM_ROOT
61 #define TARGET_SYSTEM_ROOT ""
66 FILE *saved_script_handle = NULL;
67 FILE *previous_script_handle = NULL;
68 bfd_boolean force_make_executable = FALSE;
71 const char *output_filename = "a.out";
73 /* Name this program was invoked by. */
76 /* The prefix for system library directories. */
77 const char *ld_sysroot;
79 /* The canonical representation of ld_sysroot. */
80 char * ld_canon_sysroot;
81 int ld_canon_sysroot_len;
83 /* Set by -G argument, for targets like MIPS ELF. */
84 int g_switch_value = 8;
86 /* Nonzero means print names of input files as processed. */
87 bfd_boolean trace_files;
89 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
92 /* Nonzero means version number was printed, so exit successfully
93 instead of complaining if no input files are given. */
94 bfd_boolean version_printed;
96 /* TRUE if we should demangle symbol names. */
97 bfd_boolean demangling;
99 args_type command_line;
101 ld_config_type config;
103 sort_type sort_section;
105 static const char *get_sysroot
107 static char *get_emulation
109 static bfd_boolean add_archive_element
110 (struct bfd_link_info *, bfd *, const char *, bfd **);
111 static bfd_boolean multiple_definition
112 (struct bfd_link_info *, struct bfd_link_hash_entry *,
113 bfd *, asection *, bfd_vma);
114 static bfd_boolean multiple_common
115 (struct bfd_link_info *, struct bfd_link_hash_entry *,
116 bfd *, enum bfd_link_hash_type, bfd_vma);
117 static bfd_boolean add_to_set
118 (struct bfd_link_info *, struct bfd_link_hash_entry *,
119 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
120 static bfd_boolean constructor_callback
121 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
122 asection *, bfd_vma);
123 static bfd_boolean warning_callback
124 (struct bfd_link_info *, const char *, const char *, bfd *,
125 asection *, bfd_vma);
126 static void warning_find_reloc
127 (bfd *, asection *, void *);
128 static bfd_boolean undefined_symbol
129 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
131 static bfd_boolean reloc_overflow
132 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
133 const char *, bfd_vma, bfd *, asection *, bfd_vma);
134 static bfd_boolean reloc_dangerous
135 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
136 static bfd_boolean unattached_reloc
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
138 static bfd_boolean notice
139 (struct bfd_link_info *, struct bfd_link_hash_entry *,
140 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
142 static struct bfd_link_callbacks link_callbacks =
148 constructor_callback,
158 ldlang_override_segment_assignment
161 static bfd_assert_handler_type default_bfd_assert_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 /* If there's a BFD assertion, we'll notice and exit with an error
177 unless otherwise instructed. */
180 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
181 const char *file, int line)
183 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
184 config.make_executable = FALSE;
188 main (int argc, char **argv)
191 long start_time = get_run_time ();
193 char *start_sbrk = (char *) sbrk (0);
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 xatexit (ld_cleanup);
223 /* Set up the sysroot directory. */
224 ld_sysroot = get_sysroot (argc, argv);
227 if (*TARGET_SYSTEM_ROOT == 0)
229 einfo ("%P%F: this linker was not configured to use sysroots\n");
233 ld_canon_sysroot = lrealpath (ld_sysroot);
235 if (ld_canon_sysroot)
236 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
238 ld_canon_sysroot_len = -1;
240 /* Set the default BFD target based on the configured target. Doing
241 this permits the linker to be configured for a particular target,
242 and linked against a shared BFD library which was configured for
243 a different target. The macro TARGET is defined by Makefile. */
244 if (! bfd_set_default_target (TARGET))
246 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
257 config.build_constructors = TRUE;
258 config.rpath_separator = ':';
259 config.split_by_reloc = (unsigned) -1;
260 config.split_by_file = (bfd_size_type) -1;
261 config.make_executable = TRUE;
262 config.magic_demand_paged = TRUE;
263 config.text_read_only = TRUE;
264 link_info.disable_target_specific_optimizations = -1;
266 command_line.warn_mismatch = TRUE;
267 command_line.warn_search_mismatch = TRUE;
268 command_line.check_section_addresses = -1;
270 /* We initialize DEMANGLING based on the environment variable
271 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
272 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
273 environment. Acting the same way here lets us provide the same
274 interface by default. */
275 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
277 link_info.allow_undefined_version = TRUE;
278 link_info.keep_memory = TRUE;
279 link_info.new_dtags = TRUE;
280 link_info.combreloc = TRUE;
281 link_info.strip_discarded = TRUE;
282 link_info.emit_hash = TRUE;
283 link_info.callbacks = &link_callbacks;
284 link_info.input_bfds_tail = &link_info.input_bfds;
285 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
286 and _fini symbols. We are compatible. */
287 link_info.init_function = "_init";
288 link_info.fini_function = "_fini";
289 link_info.relax_pass = 1;
290 link_info.pei386_auto_import = -1;
291 link_info.spare_dynamic_tags = 5;
292 link_info.path_separator = ':';
294 ldfile_add_arch ("");
295 emulation = get_emulation (argc, argv);
296 ldemul_choose_mode (emulation);
297 default_target = ldemul_choose_target (argc, argv);
298 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
299 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
301 ldemul_before_parse ();
302 lang_has_input_file = FALSE;
303 parse_args (argc, argv);
305 if (config.hash_table_size != 0)
306 bfd_hash_set_default_size (config.hash_table_size);
308 #ifdef ENABLE_PLUGINS
309 /* Now all the plugin arguments have been gathered, we can load them. */
310 plugin_load_plugins ();
311 #endif /* ENABLE_PLUGINS */
313 ldemul_set_symbols ();
315 /* If we have not already opened and parsed a linker script,
316 try the default script from command line first. */
317 if (saved_script_handle == NULL
318 && command_line.default_script != NULL)
320 ldfile_open_command_file (command_line.default_script);
321 parser_input = input_script;
325 /* If we have not already opened and parsed a linker script
326 read the emulation's appropriate default script. */
327 if (saved_script_handle == NULL)
330 char *s = ldemul_get_script (&isfile);
333 ldfile_open_default_command_file (s);
337 lex_redirect (s, _("built in linker script"), 1);
339 parser_input = input_script;
346 if (saved_script_handle)
347 info_msg (_("using external linker script:"));
349 info_msg (_("using internal linker script:"));
350 info_msg ("\n==================================================\n");
352 if (saved_script_handle)
354 static const int ld_bufsz = 8193;
356 char *buf = (char *) xmalloc (ld_bufsz);
358 rewind (saved_script_handle);
359 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
364 rewind (saved_script_handle);
371 info_msg (ldemul_get_script (&isfile));
374 info_msg ("\n==================================================\n");
377 if (command_line.print_output_format)
378 info_msg ("%s\n", lang_get_output_target ());
382 /* If the only command line argument has been -v or --version or --verbose
383 then ignore any input files provided by linker scripts and exit now.
384 We do not want to create an output file when the linker is just invoked
385 to provide version information. */
386 if (argc == 2 && version_printed)
389 if (!lang_has_input_file)
391 if (version_printed || command_line.print_output_format)
393 einfo (_("%P%F: no input files\n"));
397 info_msg (_("%P: mode %s\n"), emulation);
399 ldemul_after_parse ();
401 if (config.map_filename)
403 if (strcmp (config.map_filename, "-") == 0)
405 config.map_file = stdout;
409 config.map_file = fopen (config.map_filename, FOPEN_WT);
410 if (config.map_file == (FILE *) NULL)
412 bfd_set_error (bfd_error_system_call);
413 einfo (_("%P%F: cannot open map file %s: %E\n"),
414 config.map_filename);
421 /* Print error messages for any missing symbols, for any warning
422 symbols, and possibly multiple definitions. */
423 if (link_info.relocatable)
424 link_info.output_bfd->flags &= ~EXEC_P;
426 link_info.output_bfd->flags |= EXEC_P;
430 if (config.map_file != NULL)
432 if (command_line.cref)
433 output_cref (config.map_file != NULL ? config.map_file : stdout);
434 if (nocrossref_list != NULL)
435 check_nocrossrefs ();
438 struct bfd_link_hash_entry * h;
440 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
441 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
446 /* Even if we're producing relocatable output, some non-fatal errors should
447 be reported in the exit status. (What non-fatal errors, if any, do we
448 want to ignore for relocatable output?) */
449 if (!config.make_executable && !force_make_executable)
452 einfo (_("%P: link errors found, deleting executable `%s'\n"),
455 /* The file will be removed by ld_cleanup. */
460 if (! bfd_close (link_info.output_bfd))
461 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
463 /* If the --force-exe-suffix is enabled, and we're making an
464 executable file and it doesn't end in .exe, copy it to one
466 if (! link_info.relocatable && command_line.force_exe_suffix)
468 int len = strlen (output_filename);
471 || (strcasecmp (output_filename + len - 4, ".exe") != 0
472 && strcasecmp (output_filename + len - 4, ".dll") != 0))
476 const int bsize = 4096;
477 char *buf = (char *) xmalloc (bsize);
479 char *dst_name = (char *) xmalloc (len + 5);
481 strcpy (dst_name, output_filename);
482 strcat (dst_name, ".exe");
483 src = fopen (output_filename, FOPEN_RB);
484 dst = fopen (dst_name, FOPEN_WB);
487 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
490 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
492 while ((l = fread (buf, 1, bsize, src)) > 0)
494 int done = fwrite (buf, 1, l, dst);
497 einfo (_("%P: Error writing file `%s'\n"), dst_name);
501 if (fclose (dst) == EOF)
502 einfo (_("%P: Error closing file `%s'\n"), dst_name);
509 END_PROGRESS (program_name);
514 char *lim = (char *) sbrk (0);
516 long run_time = get_run_time () - start_time;
519 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
520 program_name, run_time / 1000000, run_time % 1000000);
522 fprintf (stderr, _("%s: data size %ld\n"), program_name,
523 (long) (lim - start_sbrk));
528 /* Prevent ld_cleanup from doing anything, after a successful link. */
529 output_filename = NULL;
535 /* If the configured sysroot is relocatable, try relocating it based on
536 default prefix FROM. Return the relocated directory if it exists,
537 otherwise return null. */
540 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
542 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
546 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
549 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
557 /* Return the sysroot directory. Return "" if no sysroot is being used. */
560 get_sysroot (int argc, char **argv)
565 for (i = 1; i < argc; i++)
566 if (CONST_STRNEQ (argv[i], "--sysroot="))
567 return argv[i] + strlen ("--sysroot=");
569 path = get_relative_sysroot (BINDIR);
573 path = get_relative_sysroot (TOOLBINDIR);
577 return TARGET_SYSTEM_ROOT;
580 /* We need to find any explicitly given emulation in order to initialize the
581 state that's needed by the lex&yacc argument parser (parse_args). */
584 get_emulation (int argc, char **argv)
589 emulation = getenv (EMULATION_ENVIRON);
590 if (emulation == NULL)
591 emulation = DEFAULT_EMULATION;
593 for (i = 1; i < argc; i++)
595 if (CONST_STRNEQ (argv[i], "-m"))
597 if (argv[i][2] == '\0')
602 emulation = argv[i + 1];
606 einfo (_("%P%F: missing argument to -m\n"));
608 else if (strcmp (argv[i], "-mips1") == 0
609 || strcmp (argv[i], "-mips2") == 0
610 || strcmp (argv[i], "-mips3") == 0
611 || strcmp (argv[i], "-mips4") == 0
612 || strcmp (argv[i], "-mips5") == 0
613 || strcmp (argv[i], "-mips32") == 0
614 || strcmp (argv[i], "-mips32r2") == 0
615 || strcmp (argv[i], "-mips32r6") == 0
616 || strcmp (argv[i], "-mips64") == 0
617 || strcmp (argv[i], "-mips64r2") == 0
618 || strcmp (argv[i], "-mips64r6") == 0)
620 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
621 passed to the linker by some MIPS compilers. They
622 generally tell the linker to use a slightly different
623 library path. Perhaps someday these should be
624 implemented as emulations; until then, we just ignore
625 the arguments and hope that nobody ever creates
626 emulations named ips1, ips2 or ips3. */
628 else if (strcmp (argv[i], "-m486") == 0)
630 /* FIXME: The argument -m486 is passed to the linker on
631 some Linux systems. Hope that nobody creates an
632 emulation named 486. */
637 emulation = &argv[i][2];
646 add_ysym (const char *name)
648 if (link_info.notice_hash == NULL)
650 link_info.notice_hash =
651 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
652 if (!bfd_hash_table_init_n (link_info.notice_hash,
654 sizeof (struct bfd_hash_entry),
656 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
659 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
660 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
664 add_ignoresym (struct bfd_link_info *info, const char *name)
666 if (info->ignore_hash == NULL)
668 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
669 if (! bfd_hash_table_init_n (info->ignore_hash,
671 sizeof (struct bfd_hash_entry),
673 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
676 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
677 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
680 /* Record a symbol to be wrapped, from the --wrap option. */
683 add_wrap (const char *name)
685 if (link_info.wrap_hash == NULL)
687 link_info.wrap_hash =
688 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
689 if (!bfd_hash_table_init_n (link_info.wrap_hash,
691 sizeof (struct bfd_hash_entry),
693 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
696 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
697 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
700 /* Handle the -retain-symbols-file option. */
703 add_keepsyms_file (const char *filename)
710 if (link_info.strip == strip_some)
711 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
713 file = fopen (filename, "r");
716 bfd_set_error (bfd_error_system_call);
717 einfo ("%X%P: %s: %E\n", filename);
721 link_info.keep_hash = (struct bfd_hash_table *)
722 xmalloc (sizeof (struct bfd_hash_table));
723 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
724 sizeof (struct bfd_hash_entry)))
725 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
728 buf = (char *) xmalloc (bufsize);
740 while (! ISSPACE (c) && c != EOF)
747 buf = (char *) xrealloc (buf, bufsize);
754 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
755 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
759 if (link_info.strip != strip_none)
760 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
763 link_info.strip = strip_some;
767 /* Callbacks from the BFD linker routines. */
769 /* This is called when BFD has decided to include an archive member in
773 add_archive_element (struct bfd_link_info *info,
776 bfd **subsbfd ATTRIBUTE_UNUSED)
778 lang_input_statement_type *input;
779 lang_input_statement_type orig_input;
781 input = (lang_input_statement_type *)
782 xcalloc (1, sizeof (lang_input_statement_type));
783 input->filename = abfd->filename;
784 input->local_sym_name = abfd->filename;
785 input->the_bfd = abfd;
787 /* Save the original data for trace files/tries below, as plugins
788 (if enabled) may possibly alter it to point to a replacement
789 BFD, but we still want to output the original BFD filename. */
791 #ifdef ENABLE_PLUGINS
792 if (plugin_active_plugins_p () && !no_more_claiming)
794 /* We must offer this archive member to the plugins to claim. */
795 const char *filename = (bfd_my_archive (abfd) != NULL
796 ? bfd_my_archive (abfd)->filename : abfd->filename);
797 int fd = open (filename, O_RDONLY | O_BINARY);
800 struct ld_plugin_input_file file;
802 /* Offset and filesize must refer to the individual archive
803 member, not the whole file, and must exclude the header.
804 Fortunately for us, that is how the data is stored in the
805 origin field of the bfd and in the arelt_data. */
806 file.name = filename;
807 file.offset = abfd->origin;
808 file.filesize = arelt_size (abfd);
810 plugin_maybe_claim (&file, input);
811 if (input->flags.claimed)
813 input->flags.claim_archive = TRUE;
814 *subsbfd = input->the_bfd;
818 #endif /* ENABLE_PLUGINS */
820 ldlang_add_file (input);
822 if (config.map_file != NULL)
824 static bfd_boolean header_printed;
825 struct bfd_link_hash_entry *h;
829 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
841 case bfd_link_hash_defined:
842 case bfd_link_hash_defweak:
843 from = h->u.def.section->owner;
846 case bfd_link_hash_undefined:
847 case bfd_link_hash_undefweak:
848 from = h->u.undef.abfd;
851 case bfd_link_hash_common:
852 from = h->u.c.p->section->owner;
857 if (! header_printed)
861 sprintf (buf, _("Archive member included "
862 "to satisfy reference by file (symbol)\n\n"));
864 header_printed = TRUE;
867 if (bfd_my_archive (abfd) == NULL)
869 minfo ("%s", bfd_get_filename (abfd));
870 len = strlen (bfd_get_filename (abfd));
874 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
875 bfd_get_filename (abfd));
876 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
877 + strlen (bfd_get_filename (abfd))
895 minfo ("(%T)\n", h->root.string);
897 minfo ("(%s)\n", name);
900 if (trace_files || verbose)
901 info_msg ("%I\n", &orig_input);
905 /* This is called when BFD has discovered a symbol which is defined
909 multiple_definition (struct bfd_link_info *info,
910 struct bfd_link_hash_entry *h,
920 if (info->allow_multiple_definition)
925 case bfd_link_hash_defined:
926 osec = h->u.def.section;
927 oval = h->u.def.value;
928 obfd = h->u.def.section->owner;
930 case bfd_link_hash_indirect:
931 osec = bfd_ind_section_ptr;
939 /* Ignore a redefinition of an absolute symbol to the
940 same value; it's harmless. */
941 if (h->type == bfd_link_hash_defined
942 && bfd_is_abs_section (osec)
943 && bfd_is_abs_section (nsec)
947 /* If either section has the output_section field set to
948 bfd_abs_section_ptr, it means that the section is being
949 discarded, and this is not really a multiple definition at all.
950 FIXME: It would be cleaner to somehow ignore symbols defined in
951 sections which are being discarded. */
952 if ((osec->output_section != NULL
953 && ! bfd_is_abs_section (osec)
954 && bfd_is_abs_section (osec->output_section))
955 || (nsec->output_section != NULL
956 && ! bfd_is_abs_section (nsec)
957 && bfd_is_abs_section (nsec->output_section)))
960 name = h->root.string;
968 einfo (_("%X%C: multiple definition of `%T'\n"),
969 nbfd, nsec, nval, name);
971 einfo (_("%D: first defined here\n"), obfd, osec, oval);
973 if (RELAXATION_ENABLED_BY_USER)
975 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
982 /* This is called when there is a definition of a common symbol, or
983 when a common symbol is found for a symbol that is already defined,
984 or when two common symbols are found. We only do something if
985 -warn-common was used. */
988 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
989 struct bfd_link_hash_entry *h,
991 enum bfd_link_hash_type ntype,
996 enum bfd_link_hash_type otype;
999 if (!config.warn_common)
1002 name = h->root.string;
1004 if (otype == bfd_link_hash_common)
1006 obfd = h->u.c.p->section->owner;
1007 osize = h->u.c.size;
1009 else if (otype == bfd_link_hash_defined
1010 || otype == bfd_link_hash_defweak)
1012 obfd = h->u.def.section->owner;
1017 /* FIXME: It would nice if we could report the BFD which defined
1018 an indirect symbol, but we don't have anywhere to store the
1024 if (ntype == bfd_link_hash_defined
1025 || ntype == bfd_link_hash_defweak
1026 || ntype == bfd_link_hash_indirect)
1028 ASSERT (otype == bfd_link_hash_common);
1029 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1032 einfo (_("%B: warning: common is here\n"), obfd);
1034 else if (otype == bfd_link_hash_defined
1035 || otype == bfd_link_hash_defweak
1036 || otype == bfd_link_hash_indirect)
1038 ASSERT (ntype == bfd_link_hash_common);
1039 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1042 einfo (_("%B: warning: defined here\n"), obfd);
1046 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1049 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1052 einfo (_("%B: warning: larger common is here\n"), obfd);
1054 else if (nsize > osize)
1056 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1059 einfo (_("%B: warning: smaller common is here\n"), obfd);
1063 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1065 einfo (_("%B: warning: previous common is here\n"), obfd);
1072 /* This is called when BFD has discovered a set element. H is the
1073 entry in the linker hash table for the set. SECTION and VALUE
1074 represent a value which should be added to the set. */
1077 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1078 struct bfd_link_hash_entry *h,
1079 bfd_reloc_code_real_type reloc,
1084 if (config.warn_constructors)
1085 einfo (_("%P: warning: global constructor %s used\n"),
1088 if (! config.build_constructors)
1091 ldctor_add_set_entry (h, reloc, NULL, section, value);
1093 if (h->type == bfd_link_hash_new)
1095 h->type = bfd_link_hash_undefined;
1096 h->u.undef.abfd = abfd;
1097 /* We don't call bfd_link_add_undef to add this to the list of
1098 undefined symbols because we are going to define it
1105 /* This is called when BFD has discovered a constructor. This is only
1106 called for some object file formats--those which do not handle
1107 constructors in some more clever fashion. This is similar to
1108 adding an element to a set, but less general. */
1111 constructor_callback (struct bfd_link_info *info,
1112 bfd_boolean constructor,
1119 struct bfd_link_hash_entry *h;
1120 char set_name[1 + sizeof "__CTOR_LIST__"];
1122 if (config.warn_constructors)
1123 einfo (_("%P: warning: global constructor %s used\n"), name);
1125 if (! config.build_constructors)
1128 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1129 useful error message. */
1130 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1131 && (info->relocatable
1132 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1133 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1136 if (bfd_get_symbol_leading_char (abfd) != '\0')
1137 *s++ = bfd_get_symbol_leading_char (abfd);
1139 strcpy (s, "__CTOR_LIST__");
1141 strcpy (s, "__DTOR_LIST__");
1143 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1144 if (h == (struct bfd_link_hash_entry *) NULL)
1145 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1146 if (h->type == bfd_link_hash_new)
1148 h->type = bfd_link_hash_undefined;
1149 h->u.undef.abfd = abfd;
1150 /* We don't call bfd_link_add_undef to add this to the list of
1151 undefined symbols because we are going to define it
1155 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1159 /* A structure used by warning_callback to pass information through
1160 bfd_map_over_sections. */
1162 struct warning_callback_info
1165 const char *warning;
1170 /* Look through the relocs to see if we can find a plausible address
1171 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1174 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1176 struct warning_callback_info cinfo;
1178 if (!bfd_generic_link_read_symbols (abfd))
1179 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1181 cinfo.found = FALSE;
1182 cinfo.warning = warning;
1183 cinfo.symbol = symbol;
1184 cinfo.asymbols = bfd_get_outsymbols (abfd);
1185 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1189 /* This is called when there is a reference to a warning symbol. */
1192 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1193 const char *warning,
1199 /* This is a hack to support warn_multiple_gp. FIXME: This should
1200 have a cleaner interface, but what? */
1201 if (! config.warn_multiple_gp
1202 && strcmp (warning, "using multiple gp values") == 0)
1205 if (section != NULL)
1206 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1207 else if (abfd == NULL)
1208 einfo ("%P: %s%s\n", _("warning: "), warning);
1209 else if (symbol == NULL)
1210 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1211 else if (! symbol_warning (warning, symbol, abfd))
1214 /* Search all input files for a reference to SYMBOL. */
1215 for (b = info->input_bfds; b; b = b->link.next)
1216 if (b != abfd && symbol_warning (warning, symbol, b))
1218 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1224 /* This is called by warning_callback for each section. It checks the
1225 relocs of the section to see if it can find a reference to the
1226 symbol which triggered the warning. If it can, it uses the reloc
1227 to give an error message with a file and line number. */
1230 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1232 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1236 arelent **p, **pend;
1241 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1243 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1247 relpp = (arelent **) xmalloc (relsize);
1248 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1250 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1253 pend = p + relcount;
1254 for (; p < pend && *p != NULL; p++)
1258 if (q->sym_ptr_ptr != NULL
1259 && *q->sym_ptr_ptr != NULL
1260 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1262 /* We found a reloc for the symbol we are looking for. */
1263 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1273 /* This is called when an undefined symbol is found. */
1276 undefined_symbol (struct bfd_link_info *info,
1283 static char *error_name;
1284 static unsigned int error_count;
1286 #define MAX_ERRORS_IN_A_ROW 5
1288 if (info->ignore_hash != NULL
1289 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1292 if (config.warn_once)
1294 /* Only warn once about a particular undefined symbol. */
1295 add_ignoresym (info, name);
1298 /* We never print more than a reasonable number of errors in a row
1299 for a single symbol. */
1300 if (error_name != NULL
1301 && strcmp (name, error_name) == 0)
1306 if (error_name != NULL)
1308 error_name = xstrdup (name);
1311 if (section != NULL)
1313 if (error_count < MAX_ERRORS_IN_A_ROW)
1316 einfo (_("%X%C: undefined reference to `%T'\n"),
1317 abfd, section, address, name);
1319 einfo (_("%C: warning: undefined reference to `%T'\n"),
1320 abfd, section, address, name);
1322 else if (error_count == MAX_ERRORS_IN_A_ROW)
1325 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1326 abfd, section, address, name);
1328 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1329 abfd, section, address, name);
1336 if (error_count < MAX_ERRORS_IN_A_ROW)
1339 einfo (_("%X%B: undefined reference to `%T'\n"),
1342 einfo (_("%B: warning: undefined reference to `%T'\n"),
1345 else if (error_count == MAX_ERRORS_IN_A_ROW)
1348 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1351 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1361 /* Counter to limit the number of relocation overflow error messages
1362 to print. Errors are printed as it is decremented. When it's
1363 called and the counter is zero, a final message is printed
1364 indicating more relocations were omitted. When it gets to -1, no
1365 such errors are printed. If it's initially set to a value less
1366 than -1, all such errors will be printed (--verbose does this). */
1368 int overflow_cutoff_limit = 10;
1370 /* This is called when a reloc overflows. */
1373 reloc_overflow (struct bfd_link_info *info,
1374 struct bfd_link_hash_entry *entry,
1376 const char *reloc_name,
1382 if (overflow_cutoff_limit == -1)
1385 einfo ("%X%H:", abfd, section, address);
1387 if (overflow_cutoff_limit >= 0
1388 && overflow_cutoff_limit-- == 0)
1390 einfo (_(" additional relocation overflows omitted from the output\n"));
1396 while (entry->type == bfd_link_hash_indirect
1397 || entry->type == bfd_link_hash_warning)
1398 entry = entry->u.i.link;
1399 switch (entry->type)
1401 case bfd_link_hash_undefined:
1402 case bfd_link_hash_undefweak:
1403 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1404 reloc_name, entry->root.string);
1406 case bfd_link_hash_defined:
1407 case bfd_link_hash_defweak:
1408 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1409 reloc_name, entry->root.string,
1410 entry->u.def.section,
1411 entry->u.def.section == bfd_abs_section_ptr
1412 ? info->output_bfd : entry->u.def.section->owner);
1420 einfo (_(" relocation truncated to fit: %s against `%T'"),
1423 einfo ("+%v", addend);
1428 /* This is called when a dangerous relocation is made. */
1431 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1432 const char *message,
1437 einfo (_("%X%H: dangerous relocation: %s\n"),
1438 abfd, section, address, message);
1442 /* This is called when a reloc is being generated attached to a symbol
1443 that is not being output. */
1446 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1452 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1453 abfd, section, address, name);
1457 /* This is called if link_info.notice_all is set, or when a symbol in
1458 link_info.notice_hash is found. Symbols are put in notice_hash
1459 using the -y option, while notice_all is set if the --cref option
1460 has been supplied, or if there are any NOCROSSREFS sections in the
1461 linker script; and if plugins are active, since they need to monitor
1462 all references from non-IR files. */
1465 notice (struct bfd_link_info *info,
1466 struct bfd_link_hash_entry *h,
1467 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1471 flagword flags ATTRIBUTE_UNUSED)
1477 if (command_line.cref || nocrossref_list != NULL)
1478 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1482 name = h->root.string;
1483 if (info->notice_hash != NULL
1484 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1486 if (bfd_is_und_section (section))
1487 einfo ("%B: reference to %s\n", abfd, name);
1489 einfo ("%B: definition of %s\n", abfd, name);
1492 if (command_line.cref || nocrossref_list != NULL)
1493 add_cref (name, abfd, section, value);