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
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of GLD, the Gnu Linker.
9 GLD 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 2, or (at your option)
14 GLD 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 GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 #include "filenames.h"
45 /* Somewhere above, sys/stat.h got included. */
46 #if !defined(S_ISDIR) && defined(S_IFDIR)
47 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
58 #ifndef TARGET_SYSTEM_ROOT
59 #define TARGET_SYSTEM_ROOT ""
65 const char *output_filename = "a.out";
67 /* Name this program was invoked by. */
70 /* The prefix for system library directories. */
71 const char *ld_sysroot;
73 /* The canonical representation of ld_sysroot. */
74 char * ld_canon_sysroot;
75 int ld_canon_sysroot_len;
77 /* The file that we're creating. */
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 struct bfd_link_info link_info;
175 bfd_cache_close (output_bfd);
176 if (delete_output_file_on_failure)
177 unlink_if_ordinary (output_filename);
182 main (int argc, char **argv)
185 long start_time = get_run_time ();
187 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
188 setlocale (LC_MESSAGES, "");
190 #if defined (HAVE_SETLOCALE)
191 setlocale (LC_CTYPE, "");
193 bindtextdomain (PACKAGE, LOCALEDIR);
194 textdomain (PACKAGE);
196 program_name = argv[0];
197 xmalloc_set_program_name (program_name);
199 START_PROGRESS (program_name, 0);
201 expandargv (&argc, &argv);
205 bfd_set_error_program_name (program_name);
207 xatexit (remove_output);
209 /* Set up the sysroot directory. */
210 ld_sysroot = get_sysroot (argc, argv);
213 if (*TARGET_SYSTEM_ROOT == 0)
215 einfo ("%P%F: this linker was not configured to use sysroots\n");
219 ld_canon_sysroot = lrealpath (ld_sysroot);
221 if (ld_canon_sysroot)
222 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
224 ld_canon_sysroot_len = -1;
226 /* Set the default BFD target based on the configured target. Doing
227 this permits the linker to be configured for a particular target,
228 and linked against a shared BFD library which was configured for
229 a different target. The macro TARGET is defined by Makefile. */
230 if (! bfd_set_default_target (TARGET))
232 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
243 /* Initialize the data about options. */
244 trace_files = trace_file_tries = version_printed = FALSE;
245 whole_archive = FALSE;
246 config.build_constructors = TRUE;
247 config.dynamic_link = FALSE;
248 config.has_shared = FALSE;
249 config.split_by_reloc = (unsigned) -1;
250 config.split_by_file = (bfd_size_type) -1;
251 config.hash_table_size = 0;
252 command_line.force_common_definition = FALSE;
253 command_line.inhibit_common_definition = FALSE;
254 command_line.interpreter = NULL;
255 command_line.rpath = NULL;
256 command_line.warn_mismatch = TRUE;
257 command_line.check_section_addresses = TRUE;
258 command_line.accept_unknown_input_arch = FALSE;
262 /* We initialize DEMANGLING based on the environment variable
263 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
264 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
265 environment. Acting the same way here lets us provide the same
266 interface by default. */
267 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
269 link_info.relocatable = FALSE;
270 link_info.emitrelocations = FALSE;
271 link_info.task_link = FALSE;
272 link_info.shared = FALSE;
273 link_info.pie = FALSE;
274 link_info.executable = FALSE;
275 link_info.symbolic = FALSE;
276 link_info.export_dynamic = FALSE;
277 link_info.static_link = FALSE;
278 link_info.traditional_format = FALSE;
279 link_info.optimize = FALSE;
280 link_info.unresolved_syms_in_objects = RM_NOT_YET_SET;
281 link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET;
282 link_info.allow_multiple_definition = FALSE;
283 link_info.allow_undefined_version = TRUE;
284 link_info.create_default_symver = FALSE;
285 link_info.default_imported_symver = FALSE;
286 link_info.keep_memory = TRUE;
287 link_info.notice_all = FALSE;
288 link_info.nocopyreloc = FALSE;
289 link_info.new_dtags = FALSE;
290 link_info.combreloc = TRUE;
291 link_info.eh_frame_hdr = FALSE;
292 link_info.relro = FALSE;
293 link_info.strip_discarded = TRUE;
294 link_info.strip = strip_none;
295 link_info.discard = discard_sec_merge;
296 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
297 link_info.callbacks = &link_callbacks;
298 link_info.hash = NULL;
299 link_info.keep_hash = NULL;
300 link_info.notice_hash = NULL;
301 link_info.wrap_hash = NULL;
302 link_info.input_bfds = NULL;
303 link_info.create_object_symbols_section = NULL;
304 link_info.gc_sym_list = NULL;
305 link_info.base_file = NULL;
306 link_info.emit_hash = TRUE;
307 link_info.emit_gnu_hash = FALSE;
308 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
309 and _fini symbols. We are compatible. */
310 link_info.init_function = "_init";
311 link_info.fini_function = "_fini";
312 link_info.pei386_auto_import = -1;
313 link_info.pei386_runtime_pseudo_reloc = FALSE;
314 link_info.spare_dynamic_tags = 5;
316 link_info.flags_1 = 0;
317 link_info.relax_pass = 1;
318 link_info.warn_shared_textrel = FALSE;
319 link_info.gc_sections = FALSE;
320 link_info.print_gc_sections = FALSE;
321 link_info.dynamic = NULL;
322 link_info.reduce_memory_overheads = FALSE;
324 config.maxpagesize = 0;
325 config.commonpagesize = 0;
327 ldfile_add_arch ("");
329 config.make_executable = TRUE;
330 force_make_executable = FALSE;
331 config.magic_demand_paged = TRUE;
332 config.text_read_only = TRUE;
334 emulation = get_emulation (argc, argv);
335 ldemul_choose_mode (emulation);
336 default_target = ldemul_choose_target (argc, argv);
338 ldemul_before_parse ();
339 lang_has_input_file = FALSE;
340 parse_args (argc, argv);
342 if (config.hash_table_size != 0)
343 bfd_hash_set_default_size (config.hash_table_size);
345 if (config.maxpagesize != 0)
346 bfd_emul_set_maxpagesize (default_target, config.maxpagesize);
348 if (config.commonpagesize != 0)
349 bfd_emul_set_commonpagesize (default_target,
350 config.commonpagesize);
352 ldemul_set_symbols ();
354 if (link_info.relocatable)
356 if (link_info.gc_sections)
357 einfo ("%P%F: --gc-sections and -r may not be used together\n");
358 else if (command_line.relax)
359 einfo (_("%P%F: --relax and -r may not be used together\n"));
360 if (link_info.shared)
361 einfo (_("%P%F: -r and -shared may not be used together\n"));
364 if (! link_info.shared)
366 if (command_line.filter_shlib)
367 einfo (_("%P%F: -F may not be used without -shared\n"));
368 if (command_line.auxiliary_filters)
369 einfo (_("%P%F: -f may not be used without -shared\n"));
372 if (! link_info.shared || link_info.pie)
373 link_info.executable = TRUE;
375 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
376 don't see how else this can be handled, since in this case we
377 must preserve all externally visible symbols. */
378 if (link_info.relocatable && link_info.strip == strip_all)
380 link_info.strip = strip_debugger;
381 if (link_info.discard == discard_sec_merge)
382 link_info.discard = discard_all;
385 /* This essentially adds another -L directory so this must be done after
386 the -L's in argv have been processed. */
389 /* If we have not already opened and parsed a linker script
390 read the emulation's appropriate default script. */
391 if (saved_script_handle == NULL)
394 char *s = ldemul_get_script (&isfile);
397 ldfile_open_command_file (s);
403 parser_input = input_script;
408 if (trace_file_tries)
410 if (saved_script_handle)
411 info_msg (_("using external linker script:"));
413 info_msg (_("using internal linker script:"));
414 info_msg ("\n==================================================\n");
416 if (saved_script_handle)
418 static const int ld_bufsz = 8193;
420 char *buf = xmalloc (ld_bufsz);
422 rewind (saved_script_handle);
423 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
428 rewind (saved_script_handle);
435 info_msg (ldemul_get_script (&isfile));
438 info_msg ("\n==================================================\n");
443 if (!lang_has_input_file)
447 einfo (_("%P%F: no input files\n"));
451 info_msg (_("%P: mode %s\n"), emulation);
453 ldemul_after_parse ();
455 if (config.map_filename)
457 if (strcmp (config.map_filename, "-") == 0)
459 config.map_file = stdout;
463 config.map_file = fopen (config.map_filename, FOPEN_WT);
464 if (config.map_file == (FILE *) NULL)
466 bfd_set_error (bfd_error_system_call);
467 einfo (_("%P%F: cannot open map file %s: %E\n"),
468 config.map_filename);
475 /* Print error messages for any missing symbols, for any warning
476 symbols, and possibly multiple definitions. */
477 if (link_info.relocatable)
478 output_bfd->flags &= ~EXEC_P;
480 output_bfd->flags |= EXEC_P;
484 if (config.map_file != NULL)
486 if (command_line.cref)
487 output_cref (config.map_file != NULL ? config.map_file : stdout);
488 if (nocrossref_list != NULL)
489 check_nocrossrefs ();
493 /* Even if we're producing relocatable output, some non-fatal errors should
494 be reported in the exit status. (What non-fatal errors, if any, do we
495 want to ignore for relocatable output?) */
496 if (!config.make_executable && !force_make_executable)
499 einfo (_("%P: link errors found, deleting executable `%s'\n"),
502 /* The file will be removed by remove_output. */
507 if (! bfd_close (output_bfd))
508 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
510 /* If the --force-exe-suffix is enabled, and we're making an
511 executable file and it doesn't end in .exe, copy it to one
513 if (! link_info.relocatable && command_line.force_exe_suffix)
515 int len = strlen (output_filename);
518 || (strcasecmp (output_filename + len - 4, ".exe") != 0
519 && strcasecmp (output_filename + len - 4, ".dll") != 0))
523 const int bsize = 4096;
524 char *buf = xmalloc (bsize);
526 char *dst_name = xmalloc (len + 5);
528 strcpy (dst_name, output_filename);
529 strcat (dst_name, ".exe");
530 src = fopen (output_filename, FOPEN_RB);
531 dst = fopen (dst_name, FOPEN_WB);
534 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
537 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
539 while ((l = fread (buf, 1, bsize, src)) > 0)
541 int done = fwrite (buf, 1, l, dst);
544 einfo (_("%P: Error writing file `%s'\n"), dst_name);
548 if (fclose (dst) == EOF)
549 einfo (_("%P: Error closing file `%s'\n"), dst_name);
556 END_PROGRESS (program_name);
561 char *lim = sbrk (0);
563 long run_time = get_run_time () - start_time;
565 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
566 program_name, run_time / 1000000, run_time % 1000000);
568 fprintf (stderr, _("%s: data size %ld\n"), program_name,
569 (long) (lim - (char *) &environ));
573 /* Prevent remove_output from doing anything, after a successful link. */
574 output_filename = NULL;
580 /* If the configured sysroot is relocatable, try relocating it based on
581 default prefix FROM. Return the relocated directory if it exists,
582 otherwise return null. */
585 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
587 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
591 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
594 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
602 /* Return the sysroot directory. Return "" if no sysroot is being used. */
605 get_sysroot (int argc, char **argv)
610 for (i = 1; i < argc; i++)
611 if (CONST_STRNEQ (argv[i], "--sysroot="))
612 return argv[i] + strlen ("--sysroot=");
614 path = get_relative_sysroot (BINDIR);
618 path = get_relative_sysroot (TOOLBINDIR);
622 return TARGET_SYSTEM_ROOT;
625 /* We need to find any explicitly given emulation in order to initialize the
626 state that's needed by the lex&yacc argument parser (parse_args). */
629 get_emulation (int argc, char **argv)
634 emulation = getenv (EMULATION_ENVIRON);
635 if (emulation == NULL)
636 emulation = DEFAULT_EMULATION;
638 for (i = 1; i < argc; i++)
640 if (CONST_STRNEQ (argv[i], "-m"))
642 if (argv[i][2] == '\0')
647 emulation = argv[i + 1];
651 einfo (_("%P%F: missing argument to -m\n"));
653 else if (strcmp (argv[i], "-mips1") == 0
654 || strcmp (argv[i], "-mips2") == 0
655 || strcmp (argv[i], "-mips3") == 0
656 || strcmp (argv[i], "-mips4") == 0
657 || strcmp (argv[i], "-mips5") == 0
658 || strcmp (argv[i], "-mips32") == 0
659 || strcmp (argv[i], "-mips32r2") == 0
660 || strcmp (argv[i], "-mips64") == 0
661 || strcmp (argv[i], "-mips64r2") == 0)
663 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
664 passed to the linker by some MIPS compilers. They
665 generally tell the linker to use a slightly different
666 library path. Perhaps someday these should be
667 implemented as emulations; until then, we just ignore
668 the arguments and hope that nobody ever creates
669 emulations named ips1, ips2 or ips3. */
671 else if (strcmp (argv[i], "-m486") == 0)
673 /* FIXME: The argument -m486 is passed to the linker on
674 some Linux systems. Hope that nobody creates an
675 emulation named 486. */
680 emulation = &argv[i][2];
688 /* If directory DIR contains an "ldscripts" subdirectory,
689 add DIR to the library search path and return TRUE,
690 else return FALSE. */
693 check_for_scripts_dir (char *dir)
700 dirlen = strlen (dir);
701 /* sizeof counts the terminating NUL. */
702 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
703 sprintf (buf, "%s/ldscripts", dir);
705 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
708 ldfile_add_library_path (dir, FALSE);
712 /* Set the default directory for finding script files.
713 Libraries will be searched for here too, but that's ok.
714 We look for the "ldscripts" directory in:
716 SCRIPTDIR (passed from Makefile)
717 (adjusted according to the current location of the binary)
718 SCRIPTDIR (passed from Makefile)
719 the dir where this program is (for using it from the build tree)
720 the dir where this program is/../lib
721 (for installing the tool suite elsewhere). */
724 set_scripts_dir (void)
730 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
733 found = check_for_scripts_dir (dir);
739 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
742 found = check_for_scripts_dir (dir);
748 if (check_for_scripts_dir (SCRIPTDIR))
749 /* We've been installed normally. */
752 /* Look for "ldscripts" in the dir where our binary is. */
753 end = strrchr (program_name, '/');
754 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
756 /* We could have \foo\bar, or /foo\bar. */
757 char *bslash = strrchr (program_name, '\\');
759 if (end == NULL || (bslash != NULL && bslash > end))
765 /* Don't look for ldscripts in the current directory. There is
766 too much potential for confusion. */
769 dirlen = end - program_name;
770 /* Make a copy of program_name in dir.
771 Leave room for later "/../lib". */
772 dir = xmalloc (dirlen + 8);
773 strncpy (dir, program_name, dirlen);
776 if (check_for_scripts_dir (dir))
782 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
783 strcpy (dir + dirlen, "/../lib");
784 check_for_scripts_dir (dir);
789 add_ysym (const char *name)
791 if (link_info.notice_hash == NULL)
793 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
794 if (!bfd_hash_table_init_n (link_info.notice_hash,
796 sizeof (struct bfd_hash_entry),
798 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
801 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
802 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
805 /* Record a symbol to be wrapped, from the --wrap option. */
808 add_wrap (const char *name)
810 if (link_info.wrap_hash == NULL)
812 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
813 if (!bfd_hash_table_init_n (link_info.wrap_hash,
815 sizeof (struct bfd_hash_entry),
817 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
820 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
821 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
824 /* Handle the -retain-symbols-file option. */
827 add_keepsyms_file (const char *filename)
834 if (link_info.strip == strip_some)
835 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
837 file = fopen (filename, "r");
840 bfd_set_error (bfd_error_system_call);
841 einfo ("%X%P: %s: %E\n", filename);
845 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
846 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
847 sizeof (struct bfd_hash_entry)))
848 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
851 buf = xmalloc (bufsize);
863 while (! ISSPACE (c) && c != EOF)
870 buf = xrealloc (buf, bufsize);
877 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
878 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
882 if (link_info.strip != strip_none)
883 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
886 link_info.strip = strip_some;
889 /* Callbacks from the BFD linker routines. */
891 /* This is called when BFD has decided to include an archive member in
895 add_archive_element (struct bfd_link_info *info,
899 lang_input_statement_type *input;
901 input = xmalloc (sizeof (lang_input_statement_type));
902 input->filename = abfd->filename;
903 input->local_sym_name = abfd->filename;
904 input->the_bfd = abfd;
905 input->asymbols = NULL;
907 input->just_syms_flag = FALSE;
908 input->loaded = FALSE;
909 input->search_dirs_flag = FALSE;
911 /* FIXME: The following fields are not set: header.next,
912 header.type, closed, passive_position, symbol_count,
913 next_real_file, is_archive, target, real. This bit of code is
914 from the old decode_library_subfile function. I don't know
915 whether any of those fields matters. */
917 ldlang_add_file (input);
919 if (config.map_file != NULL)
921 static bfd_boolean header_printed;
922 struct bfd_link_hash_entry *h;
926 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
938 case bfd_link_hash_defined:
939 case bfd_link_hash_defweak:
940 from = h->u.def.section->owner;
943 case bfd_link_hash_undefined:
944 case bfd_link_hash_undefweak:
945 from = h->u.undef.abfd;
948 case bfd_link_hash_common:
949 from = h->u.c.p->section->owner;
954 if (! header_printed)
958 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
960 header_printed = TRUE;
963 if (bfd_my_archive (abfd) == NULL)
965 minfo ("%s", bfd_get_filename (abfd));
966 len = strlen (bfd_get_filename (abfd));
970 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
971 bfd_get_filename (abfd));
972 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
973 + strlen (bfd_get_filename (abfd))
991 minfo ("(%T)\n", h->root.string);
993 minfo ("(%s)\n", name);
996 if (trace_files || trace_file_tries)
997 info_msg ("%I\n", input);
1002 /* This is called when BFD has discovered a symbol which is defined
1006 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1015 /* If either section has the output_section field set to
1016 bfd_abs_section_ptr, it means that the section is being
1017 discarded, and this is not really a multiple definition at all.
1018 FIXME: It would be cleaner to somehow ignore symbols defined in
1019 sections which are being discarded. */
1020 if ((osec->output_section != NULL
1021 && ! bfd_is_abs_section (osec)
1022 && bfd_is_abs_section (osec->output_section))
1023 || (nsec->output_section != NULL
1024 && ! bfd_is_abs_section (nsec)
1025 && bfd_is_abs_section (nsec->output_section)))
1028 einfo (_("%X%C: multiple definition of `%T'\n"),
1029 nbfd, nsec, nval, name);
1031 einfo (_("%D: first defined here\n"), obfd, osec, oval);
1033 if (command_line.relax)
1035 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1036 command_line.relax = 0;
1042 /* This is called when there is a definition of a common symbol, or
1043 when a common symbol is found for a symbol that is already defined,
1044 or when two common symbols are found. We only do something if
1045 -warn-common was used. */
1048 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1051 enum bfd_link_hash_type otype,
1054 enum bfd_link_hash_type ntype,
1057 if (! config.warn_common)
1060 if (ntype == bfd_link_hash_defined
1061 || ntype == bfd_link_hash_defweak
1062 || ntype == bfd_link_hash_indirect)
1064 ASSERT (otype == bfd_link_hash_common);
1065 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1068 einfo (_("%B: warning: common is here\n"), obfd);
1070 else if (otype == bfd_link_hash_defined
1071 || otype == bfd_link_hash_defweak
1072 || otype == bfd_link_hash_indirect)
1074 ASSERT (ntype == bfd_link_hash_common);
1075 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1078 einfo (_("%B: warning: defined here\n"), obfd);
1082 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1085 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1088 einfo (_("%B: warning: larger common is here\n"), obfd);
1090 else if (nsize > osize)
1092 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1095 einfo (_("%B: warning: smaller common is here\n"), obfd);
1099 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1101 einfo (_("%B: warning: previous common is here\n"), obfd);
1108 /* This is called when BFD has discovered a set element. H is the
1109 entry in the linker hash table for the set. SECTION and VALUE
1110 represent a value which should be added to the set. */
1113 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1114 struct bfd_link_hash_entry *h,
1115 bfd_reloc_code_real_type reloc,
1120 if (config.warn_constructors)
1121 einfo (_("%P: warning: global constructor %s used\n"),
1124 if (! config.build_constructors)
1127 ldctor_add_set_entry (h, reloc, NULL, section, value);
1129 if (h->type == bfd_link_hash_new)
1131 h->type = bfd_link_hash_undefined;
1132 h->u.undef.abfd = abfd;
1133 /* We don't call bfd_link_add_undef to add this to the list of
1134 undefined symbols because we are going to define it
1141 /* This is called when BFD has discovered a constructor. This is only
1142 called for some object file formats--those which do not handle
1143 constructors in some more clever fashion. This is similar to
1144 adding an element to a set, but less general. */
1147 constructor_callback (struct bfd_link_info *info,
1148 bfd_boolean constructor,
1155 struct bfd_link_hash_entry *h;
1156 char set_name[1 + sizeof "__CTOR_LIST__"];
1158 if (config.warn_constructors)
1159 einfo (_("%P: warning: global constructor %s used\n"), name);
1161 if (! config.build_constructors)
1164 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1165 useful error message. */
1166 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1167 && (info->relocatable
1168 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1169 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1172 if (bfd_get_symbol_leading_char (abfd) != '\0')
1173 *s++ = bfd_get_symbol_leading_char (abfd);
1175 strcpy (s, "__CTOR_LIST__");
1177 strcpy (s, "__DTOR_LIST__");
1179 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1180 if (h == (struct bfd_link_hash_entry *) NULL)
1181 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1182 if (h->type == bfd_link_hash_new)
1184 h->type = bfd_link_hash_undefined;
1185 h->u.undef.abfd = abfd;
1186 /* We don't call bfd_link_add_undef to add this to the list of
1187 undefined symbols because we are going to define it
1191 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1195 /* A structure used by warning_callback to pass information through
1196 bfd_map_over_sections. */
1198 struct warning_callback_info
1201 const char *warning;
1206 /* This is called when there is a reference to a warning symbol. */
1209 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1210 const char *warning,
1216 /* This is a hack to support warn_multiple_gp. FIXME: This should
1217 have a cleaner interface, but what? */
1218 if (! config.warn_multiple_gp
1219 && strcmp (warning, "using multiple gp values") == 0)
1222 if (section != NULL)
1223 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1224 else if (abfd == NULL)
1225 einfo ("%P: %s%s\n", _("warning: "), warning);
1226 else if (symbol == NULL)
1227 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1230 lang_input_statement_type *entry;
1232 struct warning_callback_info info;
1234 /* Look through the relocs to see if we can find a plausible
1236 entry = (lang_input_statement_type *) abfd->usrdata;
1237 if (entry != NULL && entry->asymbols != NULL)
1238 asymbols = entry->asymbols;
1244 symsize = bfd_get_symtab_upper_bound (abfd);
1246 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1247 asymbols = xmalloc (symsize);
1248 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1249 if (symbol_count < 0)
1250 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1253 entry->asymbols = asymbols;
1254 entry->symbol_count = symbol_count;
1259 info.warning = warning;
1260 info.symbol = symbol;
1261 info.asymbols = asymbols;
1262 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1265 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1274 /* This is called by warning_callback for each section. It checks the
1275 relocs of the section to see if it can find a reference to the
1276 symbol which triggered the warning. If it can, it uses the reloc
1277 to give an error message with a file and line number. */
1280 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1282 struct warning_callback_info *info = iarg;
1286 arelent **p, **pend;
1291 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1293 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1297 relpp = xmalloc (relsize);
1298 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1300 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1303 pend = p + relcount;
1304 for (; p < pend && *p != NULL; p++)
1308 if (q->sym_ptr_ptr != NULL
1309 && *q->sym_ptr_ptr != NULL
1310 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1312 /* We found a reloc for the symbol we are looking for. */
1313 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1323 /* This is called when an undefined symbol is found. */
1326 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1333 static char *error_name;
1334 static unsigned int error_count;
1336 #define MAX_ERRORS_IN_A_ROW 5
1338 if (config.warn_once)
1340 static struct bfd_hash_table *hash;
1342 /* Only warn once about a particular undefined symbol. */
1345 hash = xmalloc (sizeof (struct bfd_hash_table));
1346 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1347 sizeof (struct bfd_hash_entry)))
1348 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1351 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1354 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1355 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1358 /* We never print more than a reasonable number of errors in a row
1359 for a single symbol. */
1360 if (error_name != NULL
1361 && strcmp (name, error_name) == 0)
1366 if (error_name != NULL)
1368 error_name = xstrdup (name);
1371 if (section != NULL)
1373 if (error_count < MAX_ERRORS_IN_A_ROW)
1376 einfo (_("%X%C: undefined reference to `%T'\n"),
1377 abfd, section, address, name);
1379 einfo (_("%C: warning: undefined reference to `%T'\n"),
1380 abfd, section, address, name);
1382 else if (error_count == MAX_ERRORS_IN_A_ROW)
1385 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1386 abfd, section, address, name);
1388 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1389 abfd, section, address, name);
1396 if (error_count < MAX_ERRORS_IN_A_ROW)
1399 einfo (_("%X%B: undefined reference to `%T'\n"),
1402 einfo (_("%B: warning: undefined reference to `%T'\n"),
1405 else if (error_count == MAX_ERRORS_IN_A_ROW)
1408 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1411 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1421 /* Counter to limit the number of relocation overflow error messages
1422 to print. Errors are printed as it is decremented. When it's
1423 called and the counter is zero, a final message is printed
1424 indicating more relocations were omitted. When it gets to -1, no
1425 such errors are printed. If it's initially set to a value less
1426 than -1, all such errors will be printed (--verbose does this). */
1428 int overflow_cutoff_limit = 10;
1430 /* This is called when a reloc overflows. */
1433 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1434 struct bfd_link_hash_entry *entry,
1436 const char *reloc_name,
1442 if (overflow_cutoff_limit == -1)
1445 einfo ("%X%C:", abfd, section, address);
1447 if (overflow_cutoff_limit >= 0
1448 && overflow_cutoff_limit-- == 0)
1450 einfo (_(" additional relocation overflows omitted from the output\n"));
1456 while (entry->type == bfd_link_hash_indirect
1457 || entry->type == bfd_link_hash_warning)
1458 entry = entry->u.i.link;
1459 switch (entry->type)
1461 case bfd_link_hash_undefined:
1462 case bfd_link_hash_undefweak:
1463 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1464 reloc_name, entry->root.string);
1466 case bfd_link_hash_defined:
1467 case bfd_link_hash_defweak:
1468 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1469 reloc_name, entry->root.string,
1470 entry->u.def.section,
1471 entry->u.def.section == bfd_abs_section_ptr
1472 ? output_bfd : entry->u.def.section->owner);
1480 einfo (_(" relocation truncated to fit: %s against `%T'"),
1483 einfo ("+%v", addend);
1488 /* This is called when a dangerous relocation is made. */
1491 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1492 const char *message,
1497 einfo (_("%X%C: dangerous relocation: %s\n"),
1498 abfd, section, address, message);
1502 /* This is called when a reloc is being generated attached to a symbol
1503 that is not being output. */
1506 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1512 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1513 abfd, section, address, name);
1517 /* This is called if link_info.notice_all is set, or when a symbol in
1518 link_info.notice_hash is found. Symbols are put in notice_hash
1519 using the -y option. */
1522 notice (struct bfd_link_info *info,
1530 if (command_line.cref || nocrossref_list != NULL)
1531 return handle_asneeded_cref (abfd, value);
1535 if (! info->notice_all
1536 || (info->notice_hash != NULL
1537 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1539 if (bfd_is_und_section (section))
1540 einfo ("%B: reference to %s\n", abfd, name);
1542 einfo ("%B: definition of %s\n", abfd, name);
1545 if (command_line.cref || nocrossref_list != NULL)
1546 add_cref (name, abfd, section, value);