1 /* Main program of GNU linker.
2 Copyright (C) 1991-2015 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
5 This file is part of the GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "safe-ctype.h"
25 #include "libiberty.h"
28 #include "filenames.h"
43 #include "plugin-api.h"
44 #endif /* ENABLE_PLUGINS */
46 /* Somewhere above, sys/stat.h got included. */
47 #if !defined(S_ISDIR) && defined(S_IFDIR)
48 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
59 #ifndef TARGET_SYSTEM_ROOT
60 #define TARGET_SYSTEM_ROOT ""
65 FILE *saved_script_handle = NULL;
66 FILE *previous_script_handle = NULL;
67 bfd_boolean force_make_executable = FALSE;
70 const char *output_filename = "a.out";
72 /* Name this program was invoked by. */
75 /* The prefix for system library directories. */
76 const char *ld_sysroot;
78 /* The canonical representation of ld_sysroot. */
79 char * ld_canon_sysroot;
80 int ld_canon_sysroot_len;
82 /* Set by -G argument, for targets like MIPS ELF. */
83 int g_switch_value = 8;
85 /* Nonzero means print names of input files as processed. */
86 bfd_boolean trace_files;
88 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
91 /* Nonzero means version number was printed, so exit successfully
92 instead of complaining if no input files are given. */
93 bfd_boolean version_printed;
95 /* TRUE if we should demangle symbol names. */
96 bfd_boolean demangling;
98 args_type command_line;
100 ld_config_type config;
102 sort_type sort_section;
104 static const char *get_sysroot
106 static char *get_emulation
108 static bfd_boolean add_archive_element
109 (struct bfd_link_info *, bfd *, const char *, bfd **);
110 static bfd_boolean multiple_definition
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd *, asection *, bfd_vma);
113 static bfd_boolean multiple_common
114 (struct bfd_link_info *, struct bfd_link_hash_entry *,
115 bfd *, enum bfd_link_hash_type, bfd_vma);
116 static bfd_boolean add_to_set
117 (struct bfd_link_info *, struct bfd_link_hash_entry *,
118 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
119 static bfd_boolean constructor_callback
120 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
121 asection *, bfd_vma);
122 static bfd_boolean warning_callback
123 (struct bfd_link_info *, const char *, const char *, bfd *,
124 asection *, bfd_vma);
125 static void warning_find_reloc
126 (bfd *, asection *, void *);
127 static bfd_boolean undefined_symbol
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
130 static bfd_boolean reloc_overflow
131 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
132 const char *, bfd_vma, bfd *, asection *, bfd_vma);
133 static bfd_boolean reloc_dangerous
134 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
135 static bfd_boolean unattached_reloc
136 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
137 static bfd_boolean notice
138 (struct bfd_link_info *, struct bfd_link_hash_entry *,
139 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
141 static struct bfd_link_callbacks link_callbacks =
147 constructor_callback,
157 ldlang_override_segment_assignment
160 static bfd_assert_handler_type default_bfd_assert_handler;
162 struct bfd_link_info link_info;
167 bfd_cache_close_all ();
168 #ifdef ENABLE_PLUGINS
169 plugin_call_cleanup ();
171 if (output_filename && delete_output_file_on_failure)
172 unlink_if_ordinary (output_filename);
175 /* If there's a BFD assertion, we'll notice and exit with an error
176 unless otherwise instructed. */
179 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
180 const char *file, int line)
182 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
183 config.make_executable = FALSE;
187 main (int argc, char **argv)
190 long start_time = get_run_time ();
192 char *start_sbrk = (char *) sbrk (0);
195 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
196 setlocale (LC_MESSAGES, "");
198 #if defined (HAVE_SETLOCALE)
199 setlocale (LC_CTYPE, "");
201 bindtextdomain (PACKAGE, LOCALEDIR);
202 textdomain (PACKAGE);
204 program_name = argv[0];
205 xmalloc_set_program_name (program_name);
207 START_PROGRESS (program_name, 0);
209 expandargv (&argc, &argv);
213 bfd_set_error_program_name (program_name);
215 /* We want to notice and fail on those nasty BFD assertions which are
216 likely to signal incorrect output being generated but otherwise may
218 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
220 xatexit (ld_cleanup);
222 /* Set up the sysroot directory. */
223 ld_sysroot = get_sysroot (argc, argv);
226 if (*TARGET_SYSTEM_ROOT == 0)
228 einfo ("%P%F: this linker was not configured to use sysroots\n");
232 ld_canon_sysroot = lrealpath (ld_sysroot);
234 if (ld_canon_sysroot)
235 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
237 ld_canon_sysroot_len = -1;
239 /* Set the default BFD target based on the configured target. Doing
240 this permits the linker to be configured for a particular target,
241 and linked against a shared BFD library which was configured for
242 a different target. The macro TARGET is defined by Makefile. */
243 if (! bfd_set_default_target (TARGET))
245 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
256 config.build_constructors = TRUE;
257 config.rpath_separator = ':';
258 config.split_by_reloc = (unsigned) -1;
259 config.split_by_file = (bfd_size_type) -1;
260 config.make_executable = TRUE;
261 config.magic_demand_paged = TRUE;
262 config.text_read_only = TRUE;
263 link_info.disable_target_specific_optimizations = -1;
265 command_line.warn_mismatch = TRUE;
266 command_line.warn_search_mismatch = TRUE;
267 command_line.check_section_addresses = -1;
269 /* We initialize DEMANGLING based on the environment variable
270 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
271 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
272 environment. Acting the same way here lets us provide the same
273 interface by default. */
274 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
276 link_info.allow_undefined_version = TRUE;
277 link_info.keep_memory = TRUE;
278 link_info.combreloc = TRUE;
279 link_info.strip_discarded = TRUE;
280 link_info.emit_hash = TRUE;
281 link_info.callbacks = &link_callbacks;
282 link_info.input_bfds_tail = &link_info.input_bfds;
283 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
284 and _fini symbols. We are compatible. */
285 link_info.init_function = "_init";
286 link_info.fini_function = "_fini";
287 link_info.relax_pass = 1;
288 link_info.extern_protected_data = -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);
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);
447 /* Even if we're producing relocatable output, some non-fatal errors should
448 be reported in the exit status. (What non-fatal errors, if any, do we
449 want to ignore for relocatable output?) */
450 if (!config.make_executable && !force_make_executable)
453 einfo (_("%P: link errors found, deleting executable `%s'\n"),
456 /* The file will be removed by ld_cleanup. */
461 if (! bfd_close (link_info.output_bfd))
462 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
464 /* If the --force-exe-suffix is enabled, and we're making an
465 executable file and it doesn't end in .exe, copy it to one
467 if (! link_info.relocatable && command_line.force_exe_suffix)
469 int len = strlen (output_filename);
472 || (strcasecmp (output_filename + len - 4, ".exe") != 0
473 && strcasecmp (output_filename + len - 4, ".dll") != 0))
477 const int bsize = 4096;
478 char *buf = (char *) xmalloc (bsize);
480 char *dst_name = (char *) xmalloc (len + 5);
482 strcpy (dst_name, output_filename);
483 strcat (dst_name, ".exe");
484 src = fopen (output_filename, FOPEN_RB);
485 dst = fopen (dst_name, FOPEN_WB);
488 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
491 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
493 while ((l = fread (buf, 1, bsize, src)) > 0)
495 int done = fwrite (buf, 1, l, dst);
498 einfo (_("%P: Error writing file `%s'\n"), dst_name);
502 if (fclose (dst) == EOF)
503 einfo (_("%P: Error closing file `%s'\n"), dst_name);
510 END_PROGRESS (program_name);
515 char *lim = (char *) sbrk (0);
517 long run_time = get_run_time () - start_time;
520 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
521 program_name, run_time / 1000000, run_time % 1000000);
523 fprintf (stderr, _("%s: data size %ld\n"), program_name,
524 (long) (lim - start_sbrk));
529 /* Prevent ld_cleanup from doing anything, after a successful link. */
530 output_filename = NULL;
536 /* If the configured sysroot is relocatable, try relocating it based on
537 default prefix FROM. Return the relocated directory if it exists,
538 otherwise return null. */
541 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
543 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
547 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
550 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
558 /* Return the sysroot directory. Return "" if no sysroot is being used. */
561 get_sysroot (int argc, char **argv)
566 for (i = 1; i < argc; i++)
567 if (CONST_STRNEQ (argv[i], "--sysroot="))
568 return argv[i] + strlen ("--sysroot=");
570 path = get_relative_sysroot (BINDIR);
574 path = get_relative_sysroot (TOOLBINDIR);
578 return TARGET_SYSTEM_ROOT;
581 /* We need to find any explicitly given emulation in order to initialize the
582 state that's needed by the lex&yacc argument parser (parse_args). */
585 get_emulation (int argc, char **argv)
590 emulation = getenv (EMULATION_ENVIRON);
591 if (emulation == NULL)
592 emulation = DEFAULT_EMULATION;
594 for (i = 1; i < argc; i++)
596 if (CONST_STRNEQ (argv[i], "-m"))
598 if (argv[i][2] == '\0')
603 emulation = argv[i + 1];
607 einfo (_("%P%F: missing argument to -m\n"));
609 else if (strcmp (argv[i], "-mips1") == 0
610 || strcmp (argv[i], "-mips2") == 0
611 || strcmp (argv[i], "-mips3") == 0
612 || strcmp (argv[i], "-mips4") == 0
613 || strcmp (argv[i], "-mips5") == 0
614 || strcmp (argv[i], "-mips32") == 0
615 || strcmp (argv[i], "-mips32r2") == 0
616 || strcmp (argv[i], "-mips32r6") == 0
617 || strcmp (argv[i], "-mips64") == 0
618 || strcmp (argv[i], "-mips64r2") == 0
619 || strcmp (argv[i], "-mips64r6") == 0)
621 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
622 passed to the linker by some MIPS compilers. They
623 generally tell the linker to use a slightly different
624 library path. Perhaps someday these should be
625 implemented as emulations; until then, we just ignore
626 the arguments and hope that nobody ever creates
627 emulations named ips1, ips2 or ips3. */
629 else if (strcmp (argv[i], "-m486") == 0)
631 /* FIXME: The argument -m486 is passed to the linker on
632 some Linux systems. Hope that nobody creates an
633 emulation named 486. */
638 emulation = &argv[i][2];
647 add_ysym (const char *name)
649 if (link_info.notice_hash == NULL)
651 link_info.notice_hash =
652 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
653 if (!bfd_hash_table_init_n (link_info.notice_hash,
655 sizeof (struct bfd_hash_entry),
657 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
660 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
661 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
665 add_ignoresym (struct bfd_link_info *info, const char *name)
667 if (info->ignore_hash == NULL)
669 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
670 if (! bfd_hash_table_init_n (info->ignore_hash,
672 sizeof (struct bfd_hash_entry),
674 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
677 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
678 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
681 /* Record a symbol to be wrapped, from the --wrap option. */
684 add_wrap (const char *name)
686 if (link_info.wrap_hash == NULL)
688 link_info.wrap_hash =
689 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
690 if (!bfd_hash_table_init_n (link_info.wrap_hash,
692 sizeof (struct bfd_hash_entry),
694 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
697 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
698 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
701 /* Handle the -retain-symbols-file option. */
704 add_keepsyms_file (const char *filename)
711 if (link_info.strip == strip_some)
712 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
714 file = fopen (filename, "r");
717 bfd_set_error (bfd_error_system_call);
718 einfo ("%X%P: %s: %E\n", filename);
722 link_info.keep_hash = (struct bfd_hash_table *)
723 xmalloc (sizeof (struct bfd_hash_table));
724 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
725 sizeof (struct bfd_hash_entry)))
726 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
729 buf = (char *) xmalloc (bufsize);
741 while (! ISSPACE (c) && c != EOF)
748 buf = (char *) xrealloc (buf, bufsize);
755 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
756 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
760 if (link_info.strip != strip_none)
761 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
764 link_info.strip = strip_some;
768 /* Callbacks from the BFD linker routines. */
770 /* This is called when BFD has decided to include an archive member in
774 add_archive_element (struct bfd_link_info *info,
777 bfd **subsbfd ATTRIBUTE_UNUSED)
779 lang_input_statement_type *input;
780 lang_input_statement_type orig_input;
782 input = (lang_input_statement_type *)
783 xcalloc (1, sizeof (lang_input_statement_type));
784 input->filename = abfd->filename;
785 input->local_sym_name = abfd->filename;
786 input->the_bfd = abfd;
788 /* Save the original data for trace files/tries below, as plugins
789 (if enabled) may possibly alter it to point to a replacement
790 BFD, but we still want to output the original BFD filename. */
792 #ifdef ENABLE_PLUGINS
793 if (link_info.lto_plugin_active && !no_more_claiming)
795 /* We must offer this archive member to the plugins to claim. */
796 plugin_maybe_claim (input);
797 if (input->flags.claimed)
799 input->flags.claim_archive = TRUE;
800 *subsbfd = input->the_bfd;
803 #endif /* ENABLE_PLUGINS */
805 ldlang_add_file (input);
807 if (config.map_file != NULL)
809 static bfd_boolean header_printed;
810 struct bfd_link_hash_entry *h;
814 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
826 case bfd_link_hash_defined:
827 case bfd_link_hash_defweak:
828 from = h->u.def.section->owner;
831 case bfd_link_hash_undefined:
832 case bfd_link_hash_undefweak:
833 from = h->u.undef.abfd;
836 case bfd_link_hash_common:
837 from = h->u.c.p->section->owner;
842 if (! header_printed)
846 sprintf (buf, _("Archive member included "
847 "to satisfy reference by file (symbol)\n\n"));
849 header_printed = TRUE;
852 if (bfd_my_archive (abfd) == NULL)
854 minfo ("%s", bfd_get_filename (abfd));
855 len = strlen (bfd_get_filename (abfd));
859 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
860 bfd_get_filename (abfd));
861 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
862 + strlen (bfd_get_filename (abfd))
880 minfo ("(%T)\n", h->root.string);
882 minfo ("(%s)\n", name);
885 if (trace_files || verbose)
886 info_msg ("%I\n", &orig_input);
890 /* This is called when BFD has discovered a symbol which is defined
894 multiple_definition (struct bfd_link_info *info,
895 struct bfd_link_hash_entry *h,
905 if (info->allow_multiple_definition)
910 case bfd_link_hash_defined:
911 osec = h->u.def.section;
912 oval = h->u.def.value;
913 obfd = h->u.def.section->owner;
915 case bfd_link_hash_indirect:
916 osec = bfd_ind_section_ptr;
924 /* Ignore a redefinition of an absolute symbol to the
925 same value; it's harmless. */
926 if (h->type == bfd_link_hash_defined
927 && bfd_is_abs_section (osec)
928 && bfd_is_abs_section (nsec)
932 /* If either section has the output_section field set to
933 bfd_abs_section_ptr, it means that the section is being
934 discarded, and this is not really a multiple definition at all.
935 FIXME: It would be cleaner to somehow ignore symbols defined in
936 sections which are being discarded. */
937 if ((osec->output_section != NULL
938 && ! bfd_is_abs_section (osec)
939 && bfd_is_abs_section (osec->output_section))
940 || (nsec->output_section != NULL
941 && ! bfd_is_abs_section (nsec)
942 && bfd_is_abs_section (nsec->output_section)))
945 name = h->root.string;
953 einfo (_("%X%C: multiple definition of `%T'\n"),
954 nbfd, nsec, nval, name);
956 einfo (_("%D: first defined here\n"), obfd, osec, oval);
958 if (RELAXATION_ENABLED_BY_USER)
960 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
967 /* This is called when there is a definition of a common symbol, or
968 when a common symbol is found for a symbol that is already defined,
969 or when two common symbols are found. We only do something if
970 -warn-common was used. */
973 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
974 struct bfd_link_hash_entry *h,
976 enum bfd_link_hash_type ntype,
981 enum bfd_link_hash_type otype;
984 if (!config.warn_common)
987 name = h->root.string;
989 if (otype == bfd_link_hash_common)
991 obfd = h->u.c.p->section->owner;
994 else if (otype == bfd_link_hash_defined
995 || otype == bfd_link_hash_defweak)
997 obfd = h->u.def.section->owner;
1002 /* FIXME: It would nice if we could report the BFD which defined
1003 an indirect symbol, but we don't have anywhere to store the
1009 if (ntype == bfd_link_hash_defined
1010 || ntype == bfd_link_hash_defweak
1011 || ntype == bfd_link_hash_indirect)
1013 ASSERT (otype == bfd_link_hash_common);
1014 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1017 einfo (_("%B: warning: common is here\n"), obfd);
1019 else if (otype == bfd_link_hash_defined
1020 || otype == bfd_link_hash_defweak
1021 || otype == bfd_link_hash_indirect)
1023 ASSERT (ntype == bfd_link_hash_common);
1024 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1027 einfo (_("%B: warning: defined here\n"), obfd);
1031 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1034 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1037 einfo (_("%B: warning: larger common is here\n"), obfd);
1039 else if (nsize > osize)
1041 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1044 einfo (_("%B: warning: smaller common is here\n"), obfd);
1048 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1050 einfo (_("%B: warning: previous common is here\n"), obfd);
1057 /* This is called when BFD has discovered a set element. H is the
1058 entry in the linker hash table for the set. SECTION and VALUE
1059 represent a value which should be added to the set. */
1062 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1063 struct bfd_link_hash_entry *h,
1064 bfd_reloc_code_real_type reloc,
1069 if (config.warn_constructors)
1070 einfo (_("%P: warning: global constructor %s used\n"),
1073 if (! config.build_constructors)
1076 ldctor_add_set_entry (h, reloc, NULL, section, value);
1078 if (h->type == bfd_link_hash_new)
1080 h->type = bfd_link_hash_undefined;
1081 h->u.undef.abfd = abfd;
1082 /* We don't call bfd_link_add_undef to add this to the list of
1083 undefined symbols because we are going to define it
1090 /* This is called when BFD has discovered a constructor. This is only
1091 called for some object file formats--those which do not handle
1092 constructors in some more clever fashion. This is similar to
1093 adding an element to a set, but less general. */
1096 constructor_callback (struct bfd_link_info *info,
1097 bfd_boolean constructor,
1104 struct bfd_link_hash_entry *h;
1105 char set_name[1 + sizeof "__CTOR_LIST__"];
1107 if (config.warn_constructors)
1108 einfo (_("%P: warning: global constructor %s used\n"), name);
1110 if (! config.build_constructors)
1113 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1114 useful error message. */
1115 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1116 && (info->relocatable
1117 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1118 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1121 if (bfd_get_symbol_leading_char (abfd) != '\0')
1122 *s++ = bfd_get_symbol_leading_char (abfd);
1124 strcpy (s, "__CTOR_LIST__");
1126 strcpy (s, "__DTOR_LIST__");
1128 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1129 if (h == (struct bfd_link_hash_entry *) NULL)
1130 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1131 if (h->type == bfd_link_hash_new)
1133 h->type = bfd_link_hash_undefined;
1134 h->u.undef.abfd = abfd;
1135 /* We don't call bfd_link_add_undef to add this to the list of
1136 undefined symbols because we are going to define it
1140 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1144 /* A structure used by warning_callback to pass information through
1145 bfd_map_over_sections. */
1147 struct warning_callback_info
1150 const char *warning;
1155 /* Look through the relocs to see if we can find a plausible address
1156 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1159 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1161 struct warning_callback_info cinfo;
1163 if (!bfd_generic_link_read_symbols (abfd))
1164 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1166 cinfo.found = FALSE;
1167 cinfo.warning = warning;
1168 cinfo.symbol = symbol;
1169 cinfo.asymbols = bfd_get_outsymbols (abfd);
1170 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1174 /* This is called when there is a reference to a warning symbol. */
1177 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1178 const char *warning,
1184 /* This is a hack to support warn_multiple_gp. FIXME: This should
1185 have a cleaner interface, but what? */
1186 if (! config.warn_multiple_gp
1187 && strcmp (warning, "using multiple gp values") == 0)
1190 if (section != NULL)
1191 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1192 else if (abfd == NULL)
1193 einfo ("%P: %s%s\n", _("warning: "), warning);
1194 else if (symbol == NULL)
1195 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1196 else if (! symbol_warning (warning, symbol, abfd))
1199 /* Search all input files for a reference to SYMBOL. */
1200 for (b = info->input_bfds; b; b = b->link.next)
1201 if (b != abfd && symbol_warning (warning, symbol, b))
1203 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1209 /* This is called by warning_callback for each section. It checks the
1210 relocs of the section to see if it can find a reference to the
1211 symbol which triggered the warning. If it can, it uses the reloc
1212 to give an error message with a file and line number. */
1215 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1217 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1221 arelent **p, **pend;
1226 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1228 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1232 relpp = (arelent **) xmalloc (relsize);
1233 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1235 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1238 pend = p + relcount;
1239 for (; p < pend && *p != NULL; p++)
1243 if (q->sym_ptr_ptr != NULL
1244 && *q->sym_ptr_ptr != NULL
1245 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1247 /* We found a reloc for the symbol we are looking for. */
1248 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1258 /* This is called when an undefined symbol is found. */
1261 undefined_symbol (struct bfd_link_info *info,
1268 static char *error_name;
1269 static unsigned int error_count;
1271 #define MAX_ERRORS_IN_A_ROW 5
1273 if (info->ignore_hash != NULL
1274 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1277 if (config.warn_once)
1279 /* Only warn once about a particular undefined symbol. */
1280 add_ignoresym (info, name);
1283 /* We never print more than a reasonable number of errors in a row
1284 for a single symbol. */
1285 if (error_name != NULL
1286 && strcmp (name, error_name) == 0)
1291 if (error_name != NULL)
1293 error_name = xstrdup (name);
1296 if (section != NULL)
1298 if (error_count < MAX_ERRORS_IN_A_ROW)
1301 einfo (_("%X%C: undefined reference to `%T'\n"),
1302 abfd, section, address, name);
1304 einfo (_("%C: warning: undefined reference to `%T'\n"),
1305 abfd, section, address, name);
1307 else if (error_count == MAX_ERRORS_IN_A_ROW)
1310 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1311 abfd, section, address, name);
1313 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1314 abfd, section, address, name);
1321 if (error_count < MAX_ERRORS_IN_A_ROW)
1324 einfo (_("%X%B: undefined reference to `%T'\n"),
1327 einfo (_("%B: warning: undefined reference to `%T'\n"),
1330 else if (error_count == MAX_ERRORS_IN_A_ROW)
1333 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1336 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1346 /* Counter to limit the number of relocation overflow error messages
1347 to print. Errors are printed as it is decremented. When it's
1348 called and the counter is zero, a final message is printed
1349 indicating more relocations were omitted. When it gets to -1, no
1350 such errors are printed. If it's initially set to a value less
1351 than -1, all such errors will be printed (--verbose does this). */
1353 int overflow_cutoff_limit = 10;
1355 /* This is called when a reloc overflows. */
1358 reloc_overflow (struct bfd_link_info *info,
1359 struct bfd_link_hash_entry *entry,
1361 const char *reloc_name,
1367 if (overflow_cutoff_limit == -1)
1370 einfo ("%X%H:", abfd, section, address);
1372 if (overflow_cutoff_limit >= 0
1373 && overflow_cutoff_limit-- == 0)
1375 einfo (_(" additional relocation overflows omitted from the output\n"));
1381 while (entry->type == bfd_link_hash_indirect
1382 || entry->type == bfd_link_hash_warning)
1383 entry = entry->u.i.link;
1384 switch (entry->type)
1386 case bfd_link_hash_undefined:
1387 case bfd_link_hash_undefweak:
1388 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1389 reloc_name, entry->root.string);
1391 case bfd_link_hash_defined:
1392 case bfd_link_hash_defweak:
1393 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1394 reloc_name, entry->root.string,
1395 entry->u.def.section,
1396 entry->u.def.section == bfd_abs_section_ptr
1397 ? info->output_bfd : entry->u.def.section->owner);
1405 einfo (_(" relocation truncated to fit: %s against `%T'"),
1408 einfo ("+%v", addend);
1413 /* This is called when a dangerous relocation is made. */
1416 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1417 const char *message,
1422 einfo (_("%X%H: dangerous relocation: %s\n"),
1423 abfd, section, address, message);
1427 /* This is called when a reloc is being generated attached to a symbol
1428 that is not being output. */
1431 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1437 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1438 abfd, section, address, name);
1442 /* This is called if link_info.notice_all is set, or when a symbol in
1443 link_info.notice_hash is found. Symbols are put in notice_hash
1444 using the -y option, while notice_all is set if the --cref option
1445 has been supplied, or if there are any NOCROSSREFS sections in the
1446 linker script; and if plugins are active, since they need to monitor
1447 all references from non-IR files. */
1450 notice (struct bfd_link_info *info,
1451 struct bfd_link_hash_entry *h,
1452 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1456 flagword flags ATTRIBUTE_UNUSED)
1462 if (command_line.cref || nocrossref_list != NULL)
1463 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1467 name = h->root.string;
1468 if (info->notice_hash != NULL
1469 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1471 if (bfd_is_und_section (section))
1472 einfo ("%B: reference to %s\n", abfd, name);
1474 einfo ("%B: definition of %s\n", abfd, name);
1477 if (command_line.cref || nocrossref_list != NULL)
1478 add_cref (name, abfd, section, value);