1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of the GNU Binutils.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
26 #include "safe-ctype.h"
27 #include "libiberty.h"
30 #include "filenames.h"
44 /* Somewhere above, sys/stat.h got included. */
45 #if !defined(S_ISDIR) && defined(S_IFDIR)
46 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
57 #ifndef TARGET_SYSTEM_ROOT
58 #define TARGET_SYSTEM_ROOT ""
63 FILE *saved_script_handle = NULL;
64 FILE *previous_script_handle = NULL;
65 bfd_boolean force_make_executable = FALSE;
68 const char *output_filename = "a.out";
70 /* Name this program was invoked by. */
73 /* The prefix for system library directories. */
74 const char *ld_sysroot;
76 /* The canonical representation of ld_sysroot. */
77 char * ld_canon_sysroot;
78 int ld_canon_sysroot_len;
80 /* Set by -G argument, for MIPS ECOFF target. */
81 int g_switch_value = 8;
83 /* Nonzero means print names of input files as processed. */
84 bfd_boolean trace_files;
86 /* Nonzero means same, but note open failures, too. */
87 bfd_boolean trace_file_tries;
89 /* Nonzero means version number was printed, so exit successfully
90 instead of complaining if no input files are given. */
91 bfd_boolean version_printed;
93 /* Nonzero means link in every member of an archive. */
94 bfd_boolean whole_archive;
96 /* Nonzero means create DT_NEEDED entries only if a dynamic library
97 actually satisfies some reference in a regular object. */
98 bfd_boolean as_needed;
100 /* Nonzero means never create DT_NEEDED entries for dynamic libraries
101 in DT_NEEDED tags. */
102 bfd_boolean add_needed = TRUE;
104 /* TRUE if we should demangle symbol names. */
105 bfd_boolean demangling;
107 args_type command_line;
109 ld_config_type config;
111 sort_type sort_section;
113 static const char *get_sysroot
115 static char *get_emulation
117 static void set_scripts_dir
119 static bfd_boolean add_archive_element
120 (struct bfd_link_info *, bfd *, const char *);
121 static bfd_boolean multiple_definition
122 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
123 bfd *, asection *, bfd_vma);
124 static bfd_boolean multiple_common
125 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
126 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
127 static bfd_boolean add_to_set
128 (struct bfd_link_info *, struct bfd_link_hash_entry *,
129 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
130 static bfd_boolean constructor_callback
131 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
132 asection *, bfd_vma);
133 static bfd_boolean warning_callback
134 (struct bfd_link_info *, const char *, const char *, bfd *,
135 asection *, bfd_vma);
136 static void warning_find_reloc
137 (bfd *, asection *, void *);
138 static bfd_boolean undefined_symbol
139 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
141 static bfd_boolean reloc_overflow
142 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
143 const char *, bfd_vma, bfd *, asection *, bfd_vma);
144 static bfd_boolean reloc_dangerous
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean unattached_reloc
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
148 static bfd_boolean notice
149 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
151 static struct bfd_link_callbacks link_callbacks =
157 constructor_callback,
167 ldlang_override_segment_assignment
170 struct bfd_link_info link_info;
177 if (link_info.output_bfd)
178 bfd_cache_close (link_info.output_bfd);
179 if (delete_output_file_on_failure)
180 unlink_if_ordinary (output_filename);
185 main (int argc, char **argv)
188 long start_time = get_run_time ();
190 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
191 setlocale (LC_MESSAGES, "");
193 #if defined (HAVE_SETLOCALE)
194 setlocale (LC_CTYPE, "");
196 bindtextdomain (PACKAGE, LOCALEDIR);
197 textdomain (PACKAGE);
199 program_name = argv[0];
200 xmalloc_set_program_name (program_name);
202 START_PROGRESS (program_name, 0);
204 expandargv (&argc, &argv);
208 bfd_set_error_program_name (program_name);
210 xatexit (remove_output);
212 /* Set up the sysroot directory. */
213 ld_sysroot = get_sysroot (argc, argv);
216 if (*TARGET_SYSTEM_ROOT == 0)
218 einfo ("%P%F: this linker was not configured to use sysroots\n");
222 ld_canon_sysroot = lrealpath (ld_sysroot);
224 if (ld_canon_sysroot)
225 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
227 ld_canon_sysroot_len = -1;
229 /* Set the default BFD target based on the configured target. Doing
230 this permits the linker to be configured for a particular target,
231 and linked against a shared BFD library which was configured for
232 a different target. The macro TARGET is defined by Makefile. */
233 if (! bfd_set_default_target (TARGET))
235 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
246 config.build_constructors = TRUE;
247 config.rpath_separator = ':';
248 config.split_by_reloc = (unsigned) -1;
249 config.split_by_file = (bfd_size_type) -1;
250 config.make_executable = TRUE;
251 config.magic_demand_paged = TRUE;
252 config.text_read_only = TRUE;
254 command_line.warn_mismatch = TRUE;
255 command_line.warn_search_mismatch = TRUE;
256 command_line.check_section_addresses = TRUE;
258 /* We initialize DEMANGLING based on the environment variable
259 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
260 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
261 environment. Acting the same way here lets us provide the same
262 interface by default. */
263 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
265 link_info.allow_undefined_version = TRUE;
266 link_info.keep_memory = TRUE;
267 link_info.combreloc = TRUE;
268 link_info.strip_discarded = TRUE;
269 link_info.emit_hash = TRUE;
270 link_info.callbacks = &link_callbacks;
271 link_info.input_bfds_tail = &link_info.input_bfds;
272 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
273 and _fini symbols. We are compatible. */
274 link_info.init_function = "_init";
275 link_info.fini_function = "_fini";
276 link_info.relax_pass = 1;
277 link_info.pei386_auto_import = -1;
278 link_info.spare_dynamic_tags = 5;
279 link_info.path_separator = ':';
280 link_info.sep_code = FALSE;
282 ldfile_add_arch ("");
283 emulation = get_emulation (argc, argv);
284 ldemul_choose_mode (emulation);
285 default_target = ldemul_choose_target (argc, argv);
287 ldemul_before_parse ();
288 lang_has_input_file = FALSE;
289 parse_args (argc, argv);
291 if (config.hash_table_size != 0)
292 bfd_hash_set_default_size (config.hash_table_size);
294 ldemul_set_symbols ();
296 if (link_info.relocatable)
298 if (command_line.relax)
299 einfo (_("%P%F: --relax and -r may not be used together\n"));
300 if (link_info.shared)
301 einfo (_("%P%F: -r and -shared may not be used together\n"));
304 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
305 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
306 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
307 for shared libraries. -Bsymbolic overrides all others and vice
309 switch (command_line.symbolic)
314 /* -Bsymbolic is for shared library only. */
315 if (link_info.shared)
317 link_info.symbolic = TRUE;
318 /* Should we free the unused memory? */
319 link_info.dynamic_list = NULL;
320 command_line.dynamic_list = dynamic_list_unset;
323 case symbolic_functions:
324 /* -Bsymbolic-functions is for shared library only. */
325 if (link_info.shared)
326 command_line.dynamic_list = dynamic_list_data;
330 switch (command_line.dynamic_list)
332 case dynamic_list_unset:
334 case dynamic_list_data:
335 link_info.dynamic_data = TRUE;
337 link_info.dynamic = TRUE;
341 if (! link_info.shared)
343 if (command_line.filter_shlib)
344 einfo (_("%P%F: -F may not be used without -shared\n"));
345 if (command_line.auxiliary_filters)
346 einfo (_("%P%F: -f may not be used without -shared\n"));
349 if (! link_info.shared || link_info.pie)
350 link_info.executable = TRUE;
352 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
353 don't see how else this can be handled, since in this case we
354 must preserve all externally visible symbols. */
355 if (link_info.relocatable && link_info.strip == strip_all)
357 link_info.strip = strip_debugger;
358 if (link_info.discard == discard_sec_merge)
359 link_info.discard = discard_all;
362 /* This essentially adds another -L directory so this must be done after
363 the -L's in argv have been processed. */
366 /* If we have not already opened and parsed a linker script,
367 try the default script from command line first. */
368 if (saved_script_handle == NULL
369 && command_line.default_script != NULL)
371 ldfile_open_command_file (command_line.default_script);
372 parser_input = input_script;
376 /* If we have not already opened and parsed a linker script
377 read the emulation's appropriate default script. */
378 if (saved_script_handle == NULL)
381 char *s = ldemul_get_script (&isfile);
384 ldfile_open_command_file (s);
390 parser_input = input_script;
395 if (trace_file_tries)
397 if (saved_script_handle)
398 info_msg (_("using external linker script:"));
400 info_msg (_("using internal linker script:"));
401 info_msg ("\n==================================================\n");
403 if (saved_script_handle)
405 static const int ld_bufsz = 8193;
407 char *buf = xmalloc (ld_bufsz);
409 rewind (saved_script_handle);
410 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
415 rewind (saved_script_handle);
422 info_msg (ldemul_get_script (&isfile));
425 info_msg ("\n==================================================\n");
430 if (!lang_has_input_file)
434 einfo (_("%P%F: no input files\n"));
438 info_msg (_("%P: mode %s\n"), emulation);
440 ldemul_after_parse ();
442 if (config.map_filename)
444 if (strcmp (config.map_filename, "-") == 0)
446 config.map_file = stdout;
450 config.map_file = fopen (config.map_filename, FOPEN_WT);
451 if (config.map_file == (FILE *) NULL)
453 bfd_set_error (bfd_error_system_call);
454 einfo (_("%P%F: cannot open map file %s: %E\n"),
455 config.map_filename);
462 /* Print error messages for any missing symbols, for any warning
463 symbols, and possibly multiple definitions. */
464 if (link_info.relocatable)
465 link_info.output_bfd->flags &= ~EXEC_P;
467 link_info.output_bfd->flags |= EXEC_P;
471 if (config.map_file != NULL)
473 if (command_line.cref)
474 output_cref (config.map_file != NULL ? config.map_file : stdout);
475 if (nocrossref_list != NULL)
476 check_nocrossrefs ();
480 /* Even if we're producing relocatable output, some non-fatal errors should
481 be reported in the exit status. (What non-fatal errors, if any, do we
482 want to ignore for relocatable output?) */
483 if (!config.make_executable && !force_make_executable)
486 einfo (_("%P: link errors found, deleting executable `%s'\n"),
489 /* The file will be removed by remove_output. */
494 if (! bfd_close (link_info.output_bfd))
495 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
497 /* If the --force-exe-suffix is enabled, and we're making an
498 executable file and it doesn't end in .exe, copy it to one
500 if (! link_info.relocatable && command_line.force_exe_suffix)
502 int len = strlen (output_filename);
505 || (strcasecmp (output_filename + len - 4, ".exe") != 0
506 && strcasecmp (output_filename + len - 4, ".dll") != 0))
510 const int bsize = 4096;
511 char *buf = xmalloc (bsize);
513 char *dst_name = xmalloc (len + 5);
515 strcpy (dst_name, output_filename);
516 strcat (dst_name, ".exe");
517 src = fopen (output_filename, FOPEN_RB);
518 dst = fopen (dst_name, FOPEN_WB);
521 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
524 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
526 while ((l = fread (buf, 1, bsize, src)) > 0)
528 int done = fwrite (buf, 1, l, dst);
531 einfo (_("%P: Error writing file `%s'\n"), dst_name);
535 if (fclose (dst) == EOF)
536 einfo (_("%P: Error closing file `%s'\n"), dst_name);
543 END_PROGRESS (program_name);
548 char *lim = sbrk (0);
550 long run_time = get_run_time () - start_time;
552 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
553 program_name, run_time / 1000000, run_time % 1000000);
555 fprintf (stderr, _("%s: data size %ld\n"), program_name,
556 (long) (lim - (char *) &environ));
560 /* Prevent remove_output from doing anything, after a successful link. */
561 output_filename = NULL;
567 /* If the configured sysroot is relocatable, try relocating it based on
568 default prefix FROM. Return the relocated directory if it exists,
569 otherwise return null. */
572 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
574 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
578 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
581 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
589 /* Return the sysroot directory. Return "" if no sysroot is being used. */
592 get_sysroot (int argc, char **argv)
597 for (i = 1; i < argc; i++)
598 if (CONST_STRNEQ (argv[i], "--sysroot="))
599 return argv[i] + strlen ("--sysroot=");
601 path = get_relative_sysroot (BINDIR);
605 path = get_relative_sysroot (TOOLBINDIR);
609 return TARGET_SYSTEM_ROOT;
612 /* We need to find any explicitly given emulation in order to initialize the
613 state that's needed by the lex&yacc argument parser (parse_args). */
616 get_emulation (int argc, char **argv)
621 emulation = getenv (EMULATION_ENVIRON);
622 if (emulation == NULL)
623 emulation = DEFAULT_EMULATION;
625 for (i = 1; i < argc; i++)
627 if (CONST_STRNEQ (argv[i], "-m"))
629 if (argv[i][2] == '\0')
634 emulation = argv[i + 1];
638 einfo (_("%P%F: missing argument to -m\n"));
640 else if (strcmp (argv[i], "-mips1") == 0
641 || strcmp (argv[i], "-mips2") == 0
642 || strcmp (argv[i], "-mips3") == 0
643 || strcmp (argv[i], "-mips4") == 0
644 || strcmp (argv[i], "-mips5") == 0
645 || strcmp (argv[i], "-mips32") == 0
646 || strcmp (argv[i], "-mips32r2") == 0
647 || strcmp (argv[i], "-mips64") == 0
648 || strcmp (argv[i], "-mips64r2") == 0)
650 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
651 passed to the linker by some MIPS compilers. They
652 generally tell the linker to use a slightly different
653 library path. Perhaps someday these should be
654 implemented as emulations; until then, we just ignore
655 the arguments and hope that nobody ever creates
656 emulations named ips1, ips2 or ips3. */
658 else if (strcmp (argv[i], "-m486") == 0)
660 /* FIXME: The argument -m486 is passed to the linker on
661 some Linux systems. Hope that nobody creates an
662 emulation named 486. */
667 emulation = &argv[i][2];
675 /* If directory DIR contains an "ldscripts" subdirectory,
676 add DIR to the library search path and return TRUE,
677 else return FALSE. */
680 check_for_scripts_dir (char *dir)
687 dirlen = strlen (dir);
688 /* sizeof counts the terminating NUL. */
689 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
690 sprintf (buf, "%s/ldscripts", dir);
692 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
695 ldfile_add_library_path (dir, FALSE);
699 /* Set the default directory for finding script files.
700 Libraries will be searched for here too, but that's ok.
701 We look for the "ldscripts" directory in:
703 SCRIPTDIR (passed from Makefile)
704 (adjusted according to the current location of the binary)
705 SCRIPTDIR (passed from Makefile)
706 the dir where this program is (for using it from the build tree)
707 the dir where this program is/../lib
708 (for installing the tool suite elsewhere). */
711 set_scripts_dir (void)
717 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
720 found = check_for_scripts_dir (dir);
726 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
729 found = check_for_scripts_dir (dir);
735 if (check_for_scripts_dir (SCRIPTDIR))
736 /* We've been installed normally. */
739 /* Look for "ldscripts" in the dir where our binary is. */
740 end = strrchr (program_name, '/');
741 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
743 /* We could have \foo\bar, or /foo\bar. */
744 char *bslash = strrchr (program_name, '\\');
746 if (end == NULL || (bslash != NULL && bslash > end))
752 /* Don't look for ldscripts in the current directory. There is
753 too much potential for confusion. */
756 dirlen = end - program_name;
757 /* Make a copy of program_name in dir.
758 Leave room for later "/../lib". */
759 dir = xmalloc (dirlen + 8);
760 strncpy (dir, program_name, dirlen);
763 if (check_for_scripts_dir (dir))
769 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
770 strcpy (dir + dirlen, "/../lib");
771 check_for_scripts_dir (dir);
776 add_ysym (const char *name)
778 if (link_info.notice_hash == NULL)
780 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
781 if (!bfd_hash_table_init_n (link_info.notice_hash,
783 sizeof (struct bfd_hash_entry),
785 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
788 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
789 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
792 /* Record a symbol to be wrapped, from the --wrap option. */
795 add_wrap (const char *name)
797 if (link_info.wrap_hash == NULL)
799 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
800 if (!bfd_hash_table_init_n (link_info.wrap_hash,
802 sizeof (struct bfd_hash_entry),
804 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
807 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
808 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
811 /* Handle the -retain-symbols-file option. */
814 add_keepsyms_file (const char *filename)
821 if (link_info.strip == strip_some)
822 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
824 file = fopen (filename, "r");
827 bfd_set_error (bfd_error_system_call);
828 einfo ("%X%P: %s: %E\n", filename);
832 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
833 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
834 sizeof (struct bfd_hash_entry)))
835 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
838 buf = xmalloc (bufsize);
850 while (! ISSPACE (c) && c != EOF)
857 buf = xrealloc (buf, bufsize);
864 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
865 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
869 if (link_info.strip != strip_none)
870 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
873 link_info.strip = strip_some;
876 /* Callbacks from the BFD linker routines. */
878 /* This is called when BFD has decided to include an archive member in
882 add_archive_element (struct bfd_link_info *info,
886 lang_input_statement_type *input;
888 input = xmalloc (sizeof (lang_input_statement_type));
889 input->filename = abfd->filename;
890 input->local_sym_name = abfd->filename;
891 input->the_bfd = abfd;
892 input->asymbols = NULL;
894 input->just_syms_flag = FALSE;
895 input->loaded = FALSE;
896 input->search_dirs_flag = FALSE;
898 /* FIXME: The following fields are not set: header.next,
899 header.type, closed, passive_position, symbol_count,
900 next_real_file, is_archive, target, real. This bit of code is
901 from the old decode_library_subfile function. I don't know
902 whether any of those fields matters. */
904 ldlang_add_file (input);
906 if (config.map_file != NULL)
908 static bfd_boolean header_printed;
909 struct bfd_link_hash_entry *h;
913 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
925 case bfd_link_hash_defined:
926 case bfd_link_hash_defweak:
927 from = h->u.def.section->owner;
930 case bfd_link_hash_undefined:
931 case bfd_link_hash_undefweak:
932 from = h->u.undef.abfd;
935 case bfd_link_hash_common:
936 from = h->u.c.p->section->owner;
941 if (! header_printed)
945 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
947 header_printed = TRUE;
950 if (bfd_my_archive (abfd) == NULL)
952 minfo ("%s", bfd_get_filename (abfd));
953 len = strlen (bfd_get_filename (abfd));
957 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
958 bfd_get_filename (abfd));
959 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
960 + strlen (bfd_get_filename (abfd))
978 minfo ("(%T)\n", h->root.string);
980 minfo ("(%s)\n", name);
983 if (trace_files || trace_file_tries)
984 info_msg ("%I\n", input);
989 /* This is called when BFD has discovered a symbol which is defined
993 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1002 /* If either section has the output_section field set to
1003 bfd_abs_section_ptr, it means that the section is being
1004 discarded, and this is not really a multiple definition at all.
1005 FIXME: It would be cleaner to somehow ignore symbols defined in
1006 sections which are being discarded. */
1007 if ((osec->output_section != NULL
1008 && ! bfd_is_abs_section (osec)
1009 && bfd_is_abs_section (osec->output_section))
1010 || (nsec->output_section != NULL
1011 && ! bfd_is_abs_section (nsec)
1012 && bfd_is_abs_section (nsec->output_section)))
1015 einfo (_("%X%C: multiple definition of `%T'\n"),
1016 nbfd, nsec, nval, name);
1018 einfo (_("%D: first defined here\n"), obfd, osec, oval);
1020 if (command_line.relax)
1022 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1023 command_line.relax = 0;
1029 /* This is called when there is a definition of a common symbol, or
1030 when a common symbol is found for a symbol that is already defined,
1031 or when two common symbols are found. We only do something if
1032 -warn-common was used. */
1035 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1038 enum bfd_link_hash_type otype,
1041 enum bfd_link_hash_type ntype,
1044 if (! config.warn_common)
1047 if (ntype == bfd_link_hash_defined
1048 || ntype == bfd_link_hash_defweak
1049 || ntype == bfd_link_hash_indirect)
1051 ASSERT (otype == bfd_link_hash_common);
1052 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1055 einfo (_("%B: warning: common is here\n"), obfd);
1057 else if (otype == bfd_link_hash_defined
1058 || otype == bfd_link_hash_defweak
1059 || otype == bfd_link_hash_indirect)
1061 ASSERT (ntype == bfd_link_hash_common);
1062 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1065 einfo (_("%B: warning: defined here\n"), obfd);
1069 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1072 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1075 einfo (_("%B: warning: larger common is here\n"), obfd);
1077 else if (nsize > osize)
1079 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1082 einfo (_("%B: warning: smaller common is here\n"), obfd);
1086 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1088 einfo (_("%B: warning: previous common is here\n"), obfd);
1095 /* This is called when BFD has discovered a set element. H is the
1096 entry in the linker hash table for the set. SECTION and VALUE
1097 represent a value which should be added to the set. */
1100 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1101 struct bfd_link_hash_entry *h,
1102 bfd_reloc_code_real_type reloc,
1107 if (config.warn_constructors)
1108 einfo (_("%P: warning: global constructor %s used\n"),
1111 if (! config.build_constructors)
1114 ldctor_add_set_entry (h, reloc, NULL, section, value);
1116 if (h->type == bfd_link_hash_new)
1118 h->type = bfd_link_hash_undefined;
1119 h->u.undef.abfd = abfd;
1120 /* We don't call bfd_link_add_undef to add this to the list of
1121 undefined symbols because we are going to define it
1128 /* This is called when BFD has discovered a constructor. This is only
1129 called for some object file formats--those which do not handle
1130 constructors in some more clever fashion. This is similar to
1131 adding an element to a set, but less general. */
1134 constructor_callback (struct bfd_link_info *info,
1135 bfd_boolean constructor,
1142 struct bfd_link_hash_entry *h;
1143 char set_name[1 + sizeof "__CTOR_LIST__"];
1145 if (config.warn_constructors)
1146 einfo (_("%P: warning: global constructor %s used\n"), name);
1148 if (! config.build_constructors)
1151 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1152 useful error message. */
1153 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1154 && (info->relocatable
1155 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1156 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1159 if (bfd_get_symbol_leading_char (abfd) != '\0')
1160 *s++ = bfd_get_symbol_leading_char (abfd);
1162 strcpy (s, "__CTOR_LIST__");
1164 strcpy (s, "__DTOR_LIST__");
1166 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1167 if (h == (struct bfd_link_hash_entry *) NULL)
1168 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1169 if (h->type == bfd_link_hash_new)
1171 h->type = bfd_link_hash_undefined;
1172 h->u.undef.abfd = abfd;
1173 /* We don't call bfd_link_add_undef to add this to the list of
1174 undefined symbols because we are going to define it
1178 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1182 /* A structure used by warning_callback to pass information through
1183 bfd_map_over_sections. */
1185 struct warning_callback_info
1188 const char *warning;
1193 /* This is called when there is a reference to a warning symbol. */
1196 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1197 const char *warning,
1203 /* This is a hack to support warn_multiple_gp. FIXME: This should
1204 have a cleaner interface, but what? */
1205 if (! config.warn_multiple_gp
1206 && strcmp (warning, "using multiple gp values") == 0)
1209 if (section != NULL)
1210 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1211 else if (abfd == NULL)
1212 einfo ("%P: %s%s\n", _("warning: "), warning);
1213 else if (symbol == NULL)
1214 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1217 lang_input_statement_type *entry;
1219 struct warning_callback_info info;
1221 /* Look through the relocs to see if we can find a plausible
1223 entry = (lang_input_statement_type *) abfd->usrdata;
1224 if (entry != NULL && entry->asymbols != NULL)
1225 asymbols = entry->asymbols;
1231 symsize = bfd_get_symtab_upper_bound (abfd);
1233 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1234 asymbols = xmalloc (symsize);
1235 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1236 if (symbol_count < 0)
1237 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1240 entry->asymbols = asymbols;
1241 entry->symbol_count = symbol_count;
1246 info.warning = warning;
1247 info.symbol = symbol;
1248 info.asymbols = asymbols;
1249 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1252 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1261 /* This is called by warning_callback for each section. It checks the
1262 relocs of the section to see if it can find a reference to the
1263 symbol which triggered the warning. If it can, it uses the reloc
1264 to give an error message with a file and line number. */
1267 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1269 struct warning_callback_info *info = iarg;
1273 arelent **p, **pend;
1278 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1280 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1284 relpp = xmalloc (relsize);
1285 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1287 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1290 pend = p + relcount;
1291 for (; p < pend && *p != NULL; p++)
1295 if (q->sym_ptr_ptr != NULL
1296 && *q->sym_ptr_ptr != NULL
1297 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1299 /* We found a reloc for the symbol we are looking for. */
1300 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1310 /* This is called when an undefined symbol is found. */
1313 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1320 static char *error_name;
1321 static unsigned int error_count;
1323 #define MAX_ERRORS_IN_A_ROW 5
1325 if (config.warn_once)
1327 static struct bfd_hash_table *hash;
1329 /* Only warn once about a particular undefined symbol. */
1332 hash = xmalloc (sizeof (struct bfd_hash_table));
1333 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1334 sizeof (struct bfd_hash_entry)))
1335 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1338 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1341 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1342 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1345 /* We never print more than a reasonable number of errors in a row
1346 for a single symbol. */
1347 if (error_name != NULL
1348 && strcmp (name, error_name) == 0)
1353 if (error_name != NULL)
1355 error_name = xstrdup (name);
1358 if (section != NULL)
1360 if (error_count < MAX_ERRORS_IN_A_ROW)
1363 einfo (_("%X%C: undefined reference to `%T'\n"),
1364 abfd, section, address, name);
1366 einfo (_("%C: warning: undefined reference to `%T'\n"),
1367 abfd, section, address, name);
1369 else if (error_count == MAX_ERRORS_IN_A_ROW)
1372 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1373 abfd, section, address, name);
1375 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1376 abfd, section, address, name);
1383 if (error_count < MAX_ERRORS_IN_A_ROW)
1386 einfo (_("%X%B: undefined reference to `%T'\n"),
1389 einfo (_("%B: warning: undefined reference to `%T'\n"),
1392 else if (error_count == MAX_ERRORS_IN_A_ROW)
1395 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1398 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1408 /* Counter to limit the number of relocation overflow error messages
1409 to print. Errors are printed as it is decremented. When it's
1410 called and the counter is zero, a final message is printed
1411 indicating more relocations were omitted. When it gets to -1, no
1412 such errors are printed. If it's initially set to a value less
1413 than -1, all such errors will be printed (--verbose does this). */
1415 int overflow_cutoff_limit = 10;
1417 /* This is called when a reloc overflows. */
1420 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1421 struct bfd_link_hash_entry *entry,
1423 const char *reloc_name,
1429 if (overflow_cutoff_limit == -1)
1432 einfo ("%X%C:", abfd, section, address);
1434 if (overflow_cutoff_limit >= 0
1435 && overflow_cutoff_limit-- == 0)
1437 einfo (_(" additional relocation overflows omitted from the output\n"));
1443 while (entry->type == bfd_link_hash_indirect
1444 || entry->type == bfd_link_hash_warning)
1445 entry = entry->u.i.link;
1446 switch (entry->type)
1448 case bfd_link_hash_undefined:
1449 case bfd_link_hash_undefweak:
1450 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1451 reloc_name, entry->root.string);
1453 case bfd_link_hash_defined:
1454 case bfd_link_hash_defweak:
1455 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1456 reloc_name, entry->root.string,
1457 entry->u.def.section,
1458 entry->u.def.section == bfd_abs_section_ptr
1459 ? link_info.output_bfd : entry->u.def.section->owner);
1467 einfo (_(" relocation truncated to fit: %s against `%T'"),
1470 einfo ("+%v", addend);
1475 /* This is called when a dangerous relocation is made. */
1478 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1479 const char *message,
1484 einfo (_("%X%C: dangerous relocation: %s\n"),
1485 abfd, section, address, message);
1489 /* This is called when a reloc is being generated attached to a symbol
1490 that is not being output. */
1493 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1499 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1500 abfd, section, address, name);
1504 /* This is called if link_info.notice_all is set, or when a symbol in
1505 link_info.notice_hash is found. Symbols are put in notice_hash
1506 using the -y option. */
1509 notice (struct bfd_link_info *info,
1517 if (command_line.cref || nocrossref_list != NULL)
1518 return handle_asneeded_cref (abfd, value);
1522 if (! info->notice_all
1523 || (info->notice_hash != NULL
1524 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1526 if (bfd_is_und_section (section))
1527 einfo ("%B: reference to %s\n", abfd, name);
1529 einfo ("%B: definition of %s\n", abfd, name);
1532 if (command_line.cref || nocrossref_list != NULL)
1533 add_cref (name, abfd, section, value);