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 bfd *, asection *, bfd_vma, flagword, const char *);
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.combreloc = TRUE;
280 link_info.strip_discarded = TRUE;
281 link_info.emit_hash = TRUE;
282 link_info.callbacks = &link_callbacks;
283 link_info.input_bfds_tail = &link_info.input_bfds;
284 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
285 and _fini symbols. We are compatible. */
286 link_info.init_function = "_init";
287 link_info.fini_function = "_fini";
288 link_info.relax_pass = 1;
289 link_info.pei386_auto_import = -1;
290 link_info.spare_dynamic_tags = 5;
291 link_info.path_separator = ':';
293 ldfile_add_arch ("");
294 emulation = get_emulation (argc, argv);
295 ldemul_choose_mode (emulation);
296 default_target = ldemul_choose_target (argc, argv);
297 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
298 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
300 ldemul_before_parse ();
301 lang_has_input_file = FALSE;
302 parse_args (argc, argv);
304 if (config.hash_table_size != 0)
305 bfd_hash_set_default_size (config.hash_table_size);
307 #ifdef ENABLE_PLUGINS
308 /* Now all the plugin arguments have been gathered, we can load them. */
309 plugin_load_plugins ();
310 #endif /* ENABLE_PLUGINS */
312 ldemul_set_symbols ();
314 /* If we have not already opened and parsed a linker script,
315 try the default script from command line first. */
316 if (saved_script_handle == NULL
317 && command_line.default_script != NULL)
319 ldfile_open_command_file (command_line.default_script);
320 parser_input = input_script;
324 /* If we have not already opened and parsed a linker script
325 read the emulation's appropriate default script. */
326 if (saved_script_handle == NULL)
329 char *s = ldemul_get_script (&isfile);
332 ldfile_open_default_command_file (s);
336 lex_redirect (s, _("built in linker script"), 1);
338 parser_input = input_script;
345 if (saved_script_handle)
346 info_msg (_("using external linker script:"));
348 info_msg (_("using internal linker script:"));
349 info_msg ("\n==================================================\n");
351 if (saved_script_handle)
353 static const int ld_bufsz = 8193;
355 char *buf = (char *) xmalloc (ld_bufsz);
357 rewind (saved_script_handle);
358 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
363 rewind (saved_script_handle);
370 info_msg (ldemul_get_script (&isfile));
373 info_msg ("\n==================================================\n");
376 if (command_line.print_output_format)
377 info_msg ("%s\n", lang_get_output_target ());
381 /* If the only command line argument has been -v or --version or --verbose
382 then ignore any input files provided by linker scripts and exit now.
383 We do not want to create an output file when the linker is just invoked
384 to provide version information. */
385 if (argc == 2 && version_printed)
388 if (!lang_has_input_file)
390 if (version_printed || command_line.print_output_format)
392 einfo (_("%P%F: no input files\n"));
396 info_msg (_("%P: mode %s\n"), emulation);
398 ldemul_after_parse ();
400 if (config.map_filename)
402 if (strcmp (config.map_filename, "-") == 0)
404 config.map_file = stdout;
408 config.map_file = fopen (config.map_filename, FOPEN_WT);
409 if (config.map_file == (FILE *) NULL)
411 bfd_set_error (bfd_error_system_call);
412 einfo (_("%P%F: cannot open map file %s: %E\n"),
413 config.map_filename);
420 /* Print error messages for any missing symbols, for any warning
421 symbols, and possibly multiple definitions. */
422 if (link_info.relocatable)
423 link_info.output_bfd->flags &= ~EXEC_P;
425 link_info.output_bfd->flags |= EXEC_P;
429 if (config.map_file != NULL)
431 if (command_line.cref)
432 output_cref (config.map_file != NULL ? config.map_file : stdout);
433 if (nocrossref_list != NULL)
434 check_nocrossrefs ();
438 /* Even if we're producing relocatable output, some non-fatal errors should
439 be reported in the exit status. (What non-fatal errors, if any, do we
440 want to ignore for relocatable output?) */
441 if (!config.make_executable && !force_make_executable)
444 einfo (_("%P: link errors found, deleting executable `%s'\n"),
447 /* The file will be removed by ld_cleanup. */
452 if (! bfd_close (link_info.output_bfd))
453 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
455 /* If the --force-exe-suffix is enabled, and we're making an
456 executable file and it doesn't end in .exe, copy it to one
458 if (! link_info.relocatable && command_line.force_exe_suffix)
460 int len = strlen (output_filename);
463 || (strcasecmp (output_filename + len - 4, ".exe") != 0
464 && strcasecmp (output_filename + len - 4, ".dll") != 0))
468 const int bsize = 4096;
469 char *buf = (char *) xmalloc (bsize);
471 char *dst_name = (char *) xmalloc (len + 5);
473 strcpy (dst_name, output_filename);
474 strcat (dst_name, ".exe");
475 src = fopen (output_filename, FOPEN_RB);
476 dst = fopen (dst_name, FOPEN_WB);
479 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
482 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
484 while ((l = fread (buf, 1, bsize, src)) > 0)
486 int done = fwrite (buf, 1, l, dst);
489 einfo (_("%P: Error writing file `%s'\n"), dst_name);
493 if (fclose (dst) == EOF)
494 einfo (_("%P: Error closing file `%s'\n"), dst_name);
501 END_PROGRESS (program_name);
506 char *lim = (char *) sbrk (0);
508 long run_time = get_run_time () - start_time;
511 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
512 program_name, run_time / 1000000, run_time % 1000000);
514 fprintf (stderr, _("%s: data size %ld\n"), program_name,
515 (long) (lim - start_sbrk));
520 /* Prevent ld_cleanup from doing anything, after a successful link. */
521 output_filename = NULL;
527 /* If the configured sysroot is relocatable, try relocating it based on
528 default prefix FROM. Return the relocated directory if it exists,
529 otherwise return null. */
532 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
534 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
538 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
541 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
549 /* Return the sysroot directory. Return "" if no sysroot is being used. */
552 get_sysroot (int argc, char **argv)
557 for (i = 1; i < argc; i++)
558 if (CONST_STRNEQ (argv[i], "--sysroot="))
559 return argv[i] + strlen ("--sysroot=");
561 path = get_relative_sysroot (BINDIR);
565 path = get_relative_sysroot (TOOLBINDIR);
569 return TARGET_SYSTEM_ROOT;
572 /* We need to find any explicitly given emulation in order to initialize the
573 state that's needed by the lex&yacc argument parser (parse_args). */
576 get_emulation (int argc, char **argv)
581 emulation = getenv (EMULATION_ENVIRON);
582 if (emulation == NULL)
583 emulation = DEFAULT_EMULATION;
585 for (i = 1; i < argc; i++)
587 if (CONST_STRNEQ (argv[i], "-m"))
589 if (argv[i][2] == '\0')
594 emulation = argv[i + 1];
598 einfo (_("%P%F: missing argument to -m\n"));
600 else if (strcmp (argv[i], "-mips1") == 0
601 || strcmp (argv[i], "-mips2") == 0
602 || strcmp (argv[i], "-mips3") == 0
603 || strcmp (argv[i], "-mips4") == 0
604 || strcmp (argv[i], "-mips5") == 0
605 || strcmp (argv[i], "-mips32") == 0
606 || strcmp (argv[i], "-mips32r2") == 0
607 || strcmp (argv[i], "-mips64") == 0
608 || strcmp (argv[i], "-mips64r2") == 0)
610 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
611 passed to the linker by some MIPS compilers. They
612 generally tell the linker to use a slightly different
613 library path. Perhaps someday these should be
614 implemented as emulations; until then, we just ignore
615 the arguments and hope that nobody ever creates
616 emulations named ips1, ips2 or ips3. */
618 else if (strcmp (argv[i], "-m486") == 0)
620 /* FIXME: The argument -m486 is passed to the linker on
621 some Linux systems. Hope that nobody creates an
622 emulation named 486. */
627 emulation = &argv[i][2];
636 add_ysym (const char *name)
638 if (link_info.notice_hash == NULL)
640 link_info.notice_hash =
641 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
642 if (!bfd_hash_table_init_n (link_info.notice_hash,
644 sizeof (struct bfd_hash_entry),
646 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
649 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
650 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
654 add_ignoresym (struct bfd_link_info *info, const char *name)
656 if (info->ignore_hash == NULL)
658 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
659 if (! bfd_hash_table_init_n (info->ignore_hash,
661 sizeof (struct bfd_hash_entry),
663 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
666 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
667 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
670 /* Record a symbol to be wrapped, from the --wrap option. */
673 add_wrap (const char *name)
675 if (link_info.wrap_hash == NULL)
677 link_info.wrap_hash =
678 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
679 if (!bfd_hash_table_init_n (link_info.wrap_hash,
681 sizeof (struct bfd_hash_entry),
683 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
686 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
687 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
690 /* Handle the -retain-symbols-file option. */
693 add_keepsyms_file (const char *filename)
700 if (link_info.strip == strip_some)
701 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
703 file = fopen (filename, "r");
706 bfd_set_error (bfd_error_system_call);
707 einfo ("%X%P: %s: %E\n", filename);
711 link_info.keep_hash = (struct bfd_hash_table *)
712 xmalloc (sizeof (struct bfd_hash_table));
713 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
714 sizeof (struct bfd_hash_entry)))
715 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
718 buf = (char *) xmalloc (bufsize);
730 while (! ISSPACE (c) && c != EOF)
737 buf = (char *) xrealloc (buf, bufsize);
744 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
745 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
749 if (link_info.strip != strip_none)
750 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
753 link_info.strip = strip_some;
757 /* Callbacks from the BFD linker routines. */
759 /* This is called when BFD has decided to include an archive member in
763 add_archive_element (struct bfd_link_info *info,
766 bfd **subsbfd ATTRIBUTE_UNUSED)
768 lang_input_statement_type *input;
769 lang_input_statement_type orig_input;
771 input = (lang_input_statement_type *)
772 xcalloc (1, sizeof (lang_input_statement_type));
773 input->filename = abfd->filename;
774 input->local_sym_name = abfd->filename;
775 input->the_bfd = abfd;
777 /* Save the original data for trace files/tries below, as plugins
778 (if enabled) may possibly alter it to point to a replacement
779 BFD, but we still want to output the original BFD filename. */
781 #ifdef ENABLE_PLUGINS
782 if (plugin_active_plugins_p () && !no_more_claiming)
784 /* We must offer this archive member to the plugins to claim. */
785 const char *filename = (bfd_my_archive (abfd) != NULL
786 ? bfd_my_archive (abfd)->filename : abfd->filename);
787 int fd = open (filename, O_RDONLY | O_BINARY);
790 struct ld_plugin_input_file file;
792 /* Offset and filesize must refer to the individual archive
793 member, not the whole file, and must exclude the header.
794 Fortunately for us, that is how the data is stored in the
795 origin field of the bfd and in the arelt_data. */
796 file.name = filename;
797 file.offset = abfd->origin;
798 file.filesize = arelt_size (abfd);
800 plugin_maybe_claim (&file, input);
801 if (input->flags.claimed)
803 input->flags.claim_archive = TRUE;
804 *subsbfd = input->the_bfd;
808 #endif /* ENABLE_PLUGINS */
810 ldlang_add_file (input);
812 if (config.map_file != NULL)
814 static bfd_boolean header_printed;
815 struct bfd_link_hash_entry *h;
819 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
831 case bfd_link_hash_defined:
832 case bfd_link_hash_defweak:
833 from = h->u.def.section->owner;
836 case bfd_link_hash_undefined:
837 case bfd_link_hash_undefweak:
838 from = h->u.undef.abfd;
841 case bfd_link_hash_common:
842 from = h->u.c.p->section->owner;
847 if (! header_printed)
851 sprintf (buf, _("Archive member included "
852 "to satisfy reference by file (symbol)\n\n"));
854 header_printed = TRUE;
857 if (bfd_my_archive (abfd) == NULL)
859 minfo ("%s", bfd_get_filename (abfd));
860 len = strlen (bfd_get_filename (abfd));
864 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
865 bfd_get_filename (abfd));
866 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
867 + strlen (bfd_get_filename (abfd))
885 minfo ("(%T)\n", h->root.string);
887 minfo ("(%s)\n", name);
890 if (trace_files || verbose)
891 info_msg ("%I\n", &orig_input);
895 /* This is called when BFD has discovered a symbol which is defined
899 multiple_definition (struct bfd_link_info *info,
900 struct bfd_link_hash_entry *h,
910 if (info->allow_multiple_definition)
915 case bfd_link_hash_defined:
916 osec = h->u.def.section;
917 oval = h->u.def.value;
918 obfd = h->u.def.section->owner;
920 case bfd_link_hash_indirect:
921 osec = bfd_ind_section_ptr;
929 /* Ignore a redefinition of an absolute symbol to the
930 same value; it's harmless. */
931 if (h->type == bfd_link_hash_defined
932 && bfd_is_abs_section (osec)
933 && bfd_is_abs_section (nsec)
937 /* If either section has the output_section field set to
938 bfd_abs_section_ptr, it means that the section is being
939 discarded, and this is not really a multiple definition at all.
940 FIXME: It would be cleaner to somehow ignore symbols defined in
941 sections which are being discarded. */
942 if ((osec->output_section != NULL
943 && ! bfd_is_abs_section (osec)
944 && bfd_is_abs_section (osec->output_section))
945 || (nsec->output_section != NULL
946 && ! bfd_is_abs_section (nsec)
947 && bfd_is_abs_section (nsec->output_section)))
950 name = h->root.string;
958 einfo (_("%X%C: multiple definition of `%T'\n"),
959 nbfd, nsec, nval, name);
961 einfo (_("%D: first defined here\n"), obfd, osec, oval);
963 if (RELAXATION_ENABLED_BY_USER)
965 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
972 /* This is called when there is a definition of a common symbol, or
973 when a common symbol is found for a symbol that is already defined,
974 or when two common symbols are found. We only do something if
975 -warn-common was used. */
978 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
979 struct bfd_link_hash_entry *h,
981 enum bfd_link_hash_type ntype,
986 enum bfd_link_hash_type otype;
989 if (!config.warn_common)
992 name = h->root.string;
994 if (otype == bfd_link_hash_common)
996 obfd = h->u.c.p->section->owner;
999 else if (otype == bfd_link_hash_defined
1000 || otype == bfd_link_hash_defweak)
1002 obfd = h->u.def.section->owner;
1007 /* FIXME: It would nice if we could report the BFD which defined
1008 an indirect symbol, but we don't have anywhere to store the
1014 if (ntype == bfd_link_hash_defined
1015 || ntype == bfd_link_hash_defweak
1016 || ntype == bfd_link_hash_indirect)
1018 ASSERT (otype == bfd_link_hash_common);
1019 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1022 einfo (_("%B: warning: common is here\n"), obfd);
1024 else if (otype == bfd_link_hash_defined
1025 || otype == bfd_link_hash_defweak
1026 || otype == bfd_link_hash_indirect)
1028 ASSERT (ntype == bfd_link_hash_common);
1029 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1032 einfo (_("%B: warning: defined here\n"), obfd);
1036 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1039 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1042 einfo (_("%B: warning: larger common is here\n"), obfd);
1044 else if (nsize > osize)
1046 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1049 einfo (_("%B: warning: smaller common is here\n"), obfd);
1053 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1055 einfo (_("%B: warning: previous common is here\n"), obfd);
1062 /* This is called when BFD has discovered a set element. H is the
1063 entry in the linker hash table for the set. SECTION and VALUE
1064 represent a value which should be added to the set. */
1067 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1068 struct bfd_link_hash_entry *h,
1069 bfd_reloc_code_real_type reloc,
1074 if (config.warn_constructors)
1075 einfo (_("%P: warning: global constructor %s used\n"),
1078 if (! config.build_constructors)
1081 ldctor_add_set_entry (h, reloc, NULL, section, value);
1083 if (h->type == bfd_link_hash_new)
1085 h->type = bfd_link_hash_undefined;
1086 h->u.undef.abfd = abfd;
1087 /* We don't call bfd_link_add_undef to add this to the list of
1088 undefined symbols because we are going to define it
1095 /* This is called when BFD has discovered a constructor. This is only
1096 called for some object file formats--those which do not handle
1097 constructors in some more clever fashion. This is similar to
1098 adding an element to a set, but less general. */
1101 constructor_callback (struct bfd_link_info *info,
1102 bfd_boolean constructor,
1109 struct bfd_link_hash_entry *h;
1110 char set_name[1 + sizeof "__CTOR_LIST__"];
1112 if (config.warn_constructors)
1113 einfo (_("%P: warning: global constructor %s used\n"), name);
1115 if (! config.build_constructors)
1118 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1119 useful error message. */
1120 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1121 && (info->relocatable
1122 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1123 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1126 if (bfd_get_symbol_leading_char (abfd) != '\0')
1127 *s++ = bfd_get_symbol_leading_char (abfd);
1129 strcpy (s, "__CTOR_LIST__");
1131 strcpy (s, "__DTOR_LIST__");
1133 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1134 if (h == (struct bfd_link_hash_entry *) NULL)
1135 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1136 if (h->type == bfd_link_hash_new)
1138 h->type = bfd_link_hash_undefined;
1139 h->u.undef.abfd = abfd;
1140 /* We don't call bfd_link_add_undef to add this to the list of
1141 undefined symbols because we are going to define it
1145 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1149 /* A structure used by warning_callback to pass information through
1150 bfd_map_over_sections. */
1152 struct warning_callback_info
1155 const char *warning;
1160 /* Look through the relocs to see if we can find a plausible address
1161 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1164 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1166 struct warning_callback_info cinfo;
1168 if (!bfd_generic_link_read_symbols (abfd))
1169 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1171 cinfo.found = FALSE;
1172 cinfo.warning = warning;
1173 cinfo.symbol = symbol;
1174 cinfo.asymbols = bfd_get_outsymbols (abfd);
1175 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1179 /* This is called when there is a reference to a warning symbol. */
1182 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1183 const char *warning,
1189 /* This is a hack to support warn_multiple_gp. FIXME: This should
1190 have a cleaner interface, but what? */
1191 if (! config.warn_multiple_gp
1192 && strcmp (warning, "using multiple gp values") == 0)
1195 if (section != NULL)
1196 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1197 else if (abfd == NULL)
1198 einfo ("%P: %s%s\n", _("warning: "), warning);
1199 else if (symbol == NULL)
1200 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1201 else if (! symbol_warning (warning, symbol, abfd))
1204 /* Search all input files for a reference to SYMBOL. */
1205 for (b = info->input_bfds; b; b = b->link_next)
1206 if (b != abfd && symbol_warning (warning, symbol, b))
1208 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1214 /* This is called by warning_callback for each section. It checks the
1215 relocs of the section to see if it can find a reference to the
1216 symbol which triggered the warning. If it can, it uses the reloc
1217 to give an error message with a file and line number. */
1220 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1222 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1226 arelent **p, **pend;
1231 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1233 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1237 relpp = (arelent **) xmalloc (relsize);
1238 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1240 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1243 pend = p + relcount;
1244 for (; p < pend && *p != NULL; p++)
1248 if (q->sym_ptr_ptr != NULL
1249 && *q->sym_ptr_ptr != NULL
1250 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1252 /* We found a reloc for the symbol we are looking for. */
1253 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1263 /* This is called when an undefined symbol is found. */
1266 undefined_symbol (struct bfd_link_info *info,
1273 static char *error_name;
1274 static unsigned int error_count;
1276 #define MAX_ERRORS_IN_A_ROW 5
1278 if (info->ignore_hash != NULL
1279 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1282 if (config.warn_once)
1284 /* Only warn once about a particular undefined symbol. */
1285 add_ignoresym (info, name);
1288 /* We never print more than a reasonable number of errors in a row
1289 for a single symbol. */
1290 if (error_name != NULL
1291 && strcmp (name, error_name) == 0)
1296 if (error_name != NULL)
1298 error_name = xstrdup (name);
1301 if (section != NULL)
1303 if (error_count < MAX_ERRORS_IN_A_ROW)
1306 einfo (_("%X%C: undefined reference to `%T'\n"),
1307 abfd, section, address, name);
1309 einfo (_("%C: warning: undefined reference to `%T'\n"),
1310 abfd, section, address, name);
1312 else if (error_count == MAX_ERRORS_IN_A_ROW)
1315 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1316 abfd, section, address, name);
1318 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1319 abfd, section, address, name);
1326 if (error_count < MAX_ERRORS_IN_A_ROW)
1329 einfo (_("%X%B: undefined reference to `%T'\n"),
1332 einfo (_("%B: warning: undefined reference to `%T'\n"),
1335 else if (error_count == MAX_ERRORS_IN_A_ROW)
1338 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1341 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1351 /* Counter to limit the number of relocation overflow error messages
1352 to print. Errors are printed as it is decremented. When it's
1353 called and the counter is zero, a final message is printed
1354 indicating more relocations were omitted. When it gets to -1, no
1355 such errors are printed. If it's initially set to a value less
1356 than -1, all such errors will be printed (--verbose does this). */
1358 int overflow_cutoff_limit = 10;
1360 /* This is called when a reloc overflows. */
1363 reloc_overflow (struct bfd_link_info *info,
1364 struct bfd_link_hash_entry *entry,
1366 const char *reloc_name,
1372 if (overflow_cutoff_limit == -1)
1375 einfo ("%X%H:", abfd, section, address);
1377 if (overflow_cutoff_limit >= 0
1378 && overflow_cutoff_limit-- == 0)
1380 einfo (_(" additional relocation overflows omitted from the output\n"));
1386 while (entry->type == bfd_link_hash_indirect
1387 || entry->type == bfd_link_hash_warning)
1388 entry = entry->u.i.link;
1389 switch (entry->type)
1391 case bfd_link_hash_undefined:
1392 case bfd_link_hash_undefweak:
1393 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1394 reloc_name, entry->root.string);
1396 case bfd_link_hash_defined:
1397 case bfd_link_hash_defweak:
1398 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1399 reloc_name, entry->root.string,
1400 entry->u.def.section,
1401 entry->u.def.section == bfd_abs_section_ptr
1402 ? info->output_bfd : entry->u.def.section->owner);
1410 einfo (_(" relocation truncated to fit: %s against `%T'"),
1413 einfo ("+%v", addend);
1418 /* This is called when a dangerous relocation is made. */
1421 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1422 const char *message,
1427 einfo (_("%X%H: dangerous relocation: %s\n"),
1428 abfd, section, address, message);
1432 /* This is called when a reloc is being generated attached to a symbol
1433 that is not being output. */
1436 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1442 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1443 abfd, section, address, name);
1447 /* This is called if link_info.notice_all is set, or when a symbol in
1448 link_info.notice_hash is found. Symbols are put in notice_hash
1449 using the -y option, while notice_all is set if the --cref option
1450 has been supplied, or if there are any NOCROSSREFS sections in the
1451 linker script; and if plugins are active, since they need to monitor
1452 all references from non-IR files. */
1455 notice (struct bfd_link_info *info,
1456 struct bfd_link_hash_entry *h,
1460 flagword flags ATTRIBUTE_UNUSED,
1461 const char *string ATTRIBUTE_UNUSED)
1467 if (command_line.cref || nocrossref_list != NULL)
1468 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1472 name = h->root.string;
1473 if (info->notice_hash != NULL
1474 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1476 if (bfd_is_und_section (section))
1477 einfo ("%B: reference to %s\n", abfd, name);
1479 einfo ("%B: definition of %s\n", abfd, name);
1482 if (command_line.cref || nocrossref_list != NULL)
1483 add_cref (name, abfd, section, value);