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 = FALSE;
322 link_info.dynamic_list = NULL;
323 link_info.dynamic_data = FALSE;
324 link_info.reduce_memory_overheads = FALSE;
326 config.maxpagesize = 0;
327 config.commonpagesize = 0;
329 ldfile_add_arch ("");
331 config.make_executable = TRUE;
332 force_make_executable = FALSE;
333 config.magic_demand_paged = TRUE;
334 config.text_read_only = TRUE;
336 emulation = get_emulation (argc, argv);
337 ldemul_choose_mode (emulation);
338 default_target = ldemul_choose_target (argc, argv);
340 ldemul_before_parse ();
341 lang_has_input_file = FALSE;
342 parse_args (argc, argv);
344 if (config.hash_table_size != 0)
345 bfd_hash_set_default_size (config.hash_table_size);
347 if (config.maxpagesize != 0)
348 bfd_emul_set_maxpagesize (default_target, config.maxpagesize);
350 if (config.commonpagesize != 0)
351 bfd_emul_set_commonpagesize (default_target,
352 config.commonpagesize);
354 ldemul_set_symbols ();
356 if (link_info.relocatable)
358 if (link_info.gc_sections)
359 einfo ("%P%F: --gc-sections and -r may not be used together\n");
360 else if (command_line.relax)
361 einfo (_("%P%F: --relax and -r may not be used together\n"));
362 if (link_info.shared)
363 einfo (_("%P%F: -r and -shared may not be used together\n"));
366 if (! link_info.shared)
368 if (command_line.filter_shlib)
369 einfo (_("%P%F: -F may not be used without -shared\n"));
370 if (command_line.auxiliary_filters)
371 einfo (_("%P%F: -f may not be used without -shared\n"));
374 if (! link_info.shared || link_info.pie)
375 link_info.executable = TRUE;
377 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
378 don't see how else this can be handled, since in this case we
379 must preserve all externally visible symbols. */
380 if (link_info.relocatable && link_info.strip == strip_all)
382 link_info.strip = strip_debugger;
383 if (link_info.discard == discard_sec_merge)
384 link_info.discard = discard_all;
387 /* This essentially adds another -L directory so this must be done after
388 the -L's in argv have been processed. */
391 /* If we have not already opened and parsed a linker script
392 read the emulation's appropriate default script. */
393 if (saved_script_handle == NULL)
396 char *s = ldemul_get_script (&isfile);
399 ldfile_open_command_file (s);
405 parser_input = input_script;
410 if (trace_file_tries)
412 if (saved_script_handle)
413 info_msg (_("using external linker script:"));
415 info_msg (_("using internal linker script:"));
416 info_msg ("\n==================================================\n");
418 if (saved_script_handle)
420 static const int ld_bufsz = 8193;
422 char *buf = xmalloc (ld_bufsz);
424 rewind (saved_script_handle);
425 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
430 rewind (saved_script_handle);
437 info_msg (ldemul_get_script (&isfile));
440 info_msg ("\n==================================================\n");
445 if (!lang_has_input_file)
449 einfo (_("%P%F: no input files\n"));
453 info_msg (_("%P: mode %s\n"), emulation);
455 ldemul_after_parse ();
457 if (config.map_filename)
459 if (strcmp (config.map_filename, "-") == 0)
461 config.map_file = stdout;
465 config.map_file = fopen (config.map_filename, FOPEN_WT);
466 if (config.map_file == (FILE *) NULL)
468 bfd_set_error (bfd_error_system_call);
469 einfo (_("%P%F: cannot open map file %s: %E\n"),
470 config.map_filename);
477 /* Print error messages for any missing symbols, for any warning
478 symbols, and possibly multiple definitions. */
479 if (link_info.relocatable)
480 output_bfd->flags &= ~EXEC_P;
482 output_bfd->flags |= EXEC_P;
486 if (config.map_file != NULL)
488 if (command_line.cref)
489 output_cref (config.map_file != NULL ? config.map_file : stdout);
490 if (nocrossref_list != NULL)
491 check_nocrossrefs ();
495 /* Even if we're producing relocatable output, some non-fatal errors should
496 be reported in the exit status. (What non-fatal errors, if any, do we
497 want to ignore for relocatable output?) */
498 if (!config.make_executable && !force_make_executable)
501 einfo (_("%P: link errors found, deleting executable `%s'\n"),
504 /* The file will be removed by remove_output. */
509 if (! bfd_close (output_bfd))
510 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
512 /* If the --force-exe-suffix is enabled, and we're making an
513 executable file and it doesn't end in .exe, copy it to one
515 if (! link_info.relocatable && command_line.force_exe_suffix)
517 int len = strlen (output_filename);
520 || (strcasecmp (output_filename + len - 4, ".exe") != 0
521 && strcasecmp (output_filename + len - 4, ".dll") != 0))
525 const int bsize = 4096;
526 char *buf = xmalloc (bsize);
528 char *dst_name = xmalloc (len + 5);
530 strcpy (dst_name, output_filename);
531 strcat (dst_name, ".exe");
532 src = fopen (output_filename, FOPEN_RB);
533 dst = fopen (dst_name, FOPEN_WB);
536 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
539 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
541 while ((l = fread (buf, 1, bsize, src)) > 0)
543 int done = fwrite (buf, 1, l, dst);
546 einfo (_("%P: Error writing file `%s'\n"), dst_name);
550 if (fclose (dst) == EOF)
551 einfo (_("%P: Error closing file `%s'\n"), dst_name);
558 END_PROGRESS (program_name);
563 char *lim = sbrk (0);
565 long run_time = get_run_time () - start_time;
567 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
568 program_name, run_time / 1000000, run_time % 1000000);
570 fprintf (stderr, _("%s: data size %ld\n"), program_name,
571 (long) (lim - (char *) &environ));
575 /* Prevent remove_output from doing anything, after a successful link. */
576 output_filename = NULL;
582 /* If the configured sysroot is relocatable, try relocating it based on
583 default prefix FROM. Return the relocated directory if it exists,
584 otherwise return null. */
587 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
589 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
593 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
596 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
604 /* Return the sysroot directory. Return "" if no sysroot is being used. */
607 get_sysroot (int argc, char **argv)
612 for (i = 1; i < argc; i++)
613 if (CONST_STRNEQ (argv[i], "--sysroot="))
614 return argv[i] + strlen ("--sysroot=");
616 path = get_relative_sysroot (BINDIR);
620 path = get_relative_sysroot (TOOLBINDIR);
624 return TARGET_SYSTEM_ROOT;
627 /* We need to find any explicitly given emulation in order to initialize the
628 state that's needed by the lex&yacc argument parser (parse_args). */
631 get_emulation (int argc, char **argv)
636 emulation = getenv (EMULATION_ENVIRON);
637 if (emulation == NULL)
638 emulation = DEFAULT_EMULATION;
640 for (i = 1; i < argc; i++)
642 if (CONST_STRNEQ (argv[i], "-m"))
644 if (argv[i][2] == '\0')
649 emulation = argv[i + 1];
653 einfo (_("%P%F: missing argument to -m\n"));
655 else if (strcmp (argv[i], "-mips1") == 0
656 || strcmp (argv[i], "-mips2") == 0
657 || strcmp (argv[i], "-mips3") == 0
658 || strcmp (argv[i], "-mips4") == 0
659 || strcmp (argv[i], "-mips5") == 0
660 || strcmp (argv[i], "-mips32") == 0
661 || strcmp (argv[i], "-mips32r2") == 0
662 || strcmp (argv[i], "-mips64") == 0
663 || strcmp (argv[i], "-mips64r2") == 0)
665 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
666 passed to the linker by some MIPS compilers. They
667 generally tell the linker to use a slightly different
668 library path. Perhaps someday these should be
669 implemented as emulations; until then, we just ignore
670 the arguments and hope that nobody ever creates
671 emulations named ips1, ips2 or ips3. */
673 else if (strcmp (argv[i], "-m486") == 0)
675 /* FIXME: The argument -m486 is passed to the linker on
676 some Linux systems. Hope that nobody creates an
677 emulation named 486. */
682 emulation = &argv[i][2];
690 /* If directory DIR contains an "ldscripts" subdirectory,
691 add DIR to the library search path and return TRUE,
692 else return FALSE. */
695 check_for_scripts_dir (char *dir)
702 dirlen = strlen (dir);
703 /* sizeof counts the terminating NUL. */
704 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
705 sprintf (buf, "%s/ldscripts", dir);
707 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
710 ldfile_add_library_path (dir, FALSE);
714 /* Set the default directory for finding script files.
715 Libraries will be searched for here too, but that's ok.
716 We look for the "ldscripts" directory in:
718 SCRIPTDIR (passed from Makefile)
719 (adjusted according to the current location of the binary)
720 SCRIPTDIR (passed from Makefile)
721 the dir where this program is (for using it from the build tree)
722 the dir where this program is/../lib
723 (for installing the tool suite elsewhere). */
726 set_scripts_dir (void)
732 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
735 found = check_for_scripts_dir (dir);
741 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
744 found = check_for_scripts_dir (dir);
750 if (check_for_scripts_dir (SCRIPTDIR))
751 /* We've been installed normally. */
754 /* Look for "ldscripts" in the dir where our binary is. */
755 end = strrchr (program_name, '/');
756 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
758 /* We could have \foo\bar, or /foo\bar. */
759 char *bslash = strrchr (program_name, '\\');
761 if (end == NULL || (bslash != NULL && bslash > end))
767 /* Don't look for ldscripts in the current directory. There is
768 too much potential for confusion. */
771 dirlen = end - program_name;
772 /* Make a copy of program_name in dir.
773 Leave room for later "/../lib". */
774 dir = xmalloc (dirlen + 8);
775 strncpy (dir, program_name, dirlen);
778 if (check_for_scripts_dir (dir))
784 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
785 strcpy (dir + dirlen, "/../lib");
786 check_for_scripts_dir (dir);
791 add_ysym (const char *name)
793 if (link_info.notice_hash == NULL)
795 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
796 if (!bfd_hash_table_init_n (link_info.notice_hash,
798 sizeof (struct bfd_hash_entry),
800 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
803 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
804 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
807 /* Record a symbol to be wrapped, from the --wrap option. */
810 add_wrap (const char *name)
812 if (link_info.wrap_hash == NULL)
814 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
815 if (!bfd_hash_table_init_n (link_info.wrap_hash,
817 sizeof (struct bfd_hash_entry),
819 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
822 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
823 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
826 /* Handle the -retain-symbols-file option. */
829 add_keepsyms_file (const char *filename)
836 if (link_info.strip == strip_some)
837 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
839 file = fopen (filename, "r");
842 bfd_set_error (bfd_error_system_call);
843 einfo ("%X%P: %s: %E\n", filename);
847 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
848 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
849 sizeof (struct bfd_hash_entry)))
850 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
853 buf = xmalloc (bufsize);
865 while (! ISSPACE (c) && c != EOF)
872 buf = xrealloc (buf, bufsize);
879 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
880 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
884 if (link_info.strip != strip_none)
885 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
888 link_info.strip = strip_some;
891 /* Callbacks from the BFD linker routines. */
893 /* This is called when BFD has decided to include an archive member in
897 add_archive_element (struct bfd_link_info *info,
901 lang_input_statement_type *input;
903 input = xmalloc (sizeof (lang_input_statement_type));
904 input->filename = abfd->filename;
905 input->local_sym_name = abfd->filename;
906 input->the_bfd = abfd;
907 input->asymbols = NULL;
909 input->just_syms_flag = FALSE;
910 input->loaded = FALSE;
911 input->search_dirs_flag = FALSE;
913 /* FIXME: The following fields are not set: header.next,
914 header.type, closed, passive_position, symbol_count,
915 next_real_file, is_archive, target, real. This bit of code is
916 from the old decode_library_subfile function. I don't know
917 whether any of those fields matters. */
919 ldlang_add_file (input);
921 if (config.map_file != NULL)
923 static bfd_boolean header_printed;
924 struct bfd_link_hash_entry *h;
928 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
940 case bfd_link_hash_defined:
941 case bfd_link_hash_defweak:
942 from = h->u.def.section->owner;
945 case bfd_link_hash_undefined:
946 case bfd_link_hash_undefweak:
947 from = h->u.undef.abfd;
950 case bfd_link_hash_common:
951 from = h->u.c.p->section->owner;
956 if (! header_printed)
960 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
962 header_printed = TRUE;
965 if (bfd_my_archive (abfd) == NULL)
967 minfo ("%s", bfd_get_filename (abfd));
968 len = strlen (bfd_get_filename (abfd));
972 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
973 bfd_get_filename (abfd));
974 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
975 + strlen (bfd_get_filename (abfd))
993 minfo ("(%T)\n", h->root.string);
995 minfo ("(%s)\n", name);
998 if (trace_files || trace_file_tries)
999 info_msg ("%I\n", input);
1004 /* This is called when BFD has discovered a symbol which is defined
1008 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1017 /* If either section has the output_section field set to
1018 bfd_abs_section_ptr, it means that the section is being
1019 discarded, and this is not really a multiple definition at all.
1020 FIXME: It would be cleaner to somehow ignore symbols defined in
1021 sections which are being discarded. */
1022 if ((osec->output_section != NULL
1023 && ! bfd_is_abs_section (osec)
1024 && bfd_is_abs_section (osec->output_section))
1025 || (nsec->output_section != NULL
1026 && ! bfd_is_abs_section (nsec)
1027 && bfd_is_abs_section (nsec->output_section)))
1030 einfo (_("%X%C: multiple definition of `%T'\n"),
1031 nbfd, nsec, nval, name);
1033 einfo (_("%D: first defined here\n"), obfd, osec, oval);
1035 if (command_line.relax)
1037 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1038 command_line.relax = 0;
1044 /* This is called when there is a definition of a common symbol, or
1045 when a common symbol is found for a symbol that is already defined,
1046 or when two common symbols are found. We only do something if
1047 -warn-common was used. */
1050 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1053 enum bfd_link_hash_type otype,
1056 enum bfd_link_hash_type ntype,
1059 if (! config.warn_common)
1062 if (ntype == bfd_link_hash_defined
1063 || ntype == bfd_link_hash_defweak
1064 || ntype == bfd_link_hash_indirect)
1066 ASSERT (otype == bfd_link_hash_common);
1067 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1070 einfo (_("%B: warning: common is here\n"), obfd);
1072 else if (otype == bfd_link_hash_defined
1073 || otype == bfd_link_hash_defweak
1074 || otype == bfd_link_hash_indirect)
1076 ASSERT (ntype == bfd_link_hash_common);
1077 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1080 einfo (_("%B: warning: defined here\n"), obfd);
1084 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1087 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1090 einfo (_("%B: warning: larger common is here\n"), obfd);
1092 else if (nsize > osize)
1094 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1097 einfo (_("%B: warning: smaller common is here\n"), obfd);
1101 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1103 einfo (_("%B: warning: previous common is here\n"), obfd);
1110 /* This is called when BFD has discovered a set element. H is the
1111 entry in the linker hash table for the set. SECTION and VALUE
1112 represent a value which should be added to the set. */
1115 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1116 struct bfd_link_hash_entry *h,
1117 bfd_reloc_code_real_type reloc,
1122 if (config.warn_constructors)
1123 einfo (_("%P: warning: global constructor %s used\n"),
1126 if (! config.build_constructors)
1129 ldctor_add_set_entry (h, reloc, NULL, section, value);
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
1143 /* This is called when BFD has discovered a constructor. This is only
1144 called for some object file formats--those which do not handle
1145 constructors in some more clever fashion. This is similar to
1146 adding an element to a set, but less general. */
1149 constructor_callback (struct bfd_link_info *info,
1150 bfd_boolean constructor,
1157 struct bfd_link_hash_entry *h;
1158 char set_name[1 + sizeof "__CTOR_LIST__"];
1160 if (config.warn_constructors)
1161 einfo (_("%P: warning: global constructor %s used\n"), name);
1163 if (! config.build_constructors)
1166 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1167 useful error message. */
1168 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1169 && (info->relocatable
1170 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1171 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1174 if (bfd_get_symbol_leading_char (abfd) != '\0')
1175 *s++ = bfd_get_symbol_leading_char (abfd);
1177 strcpy (s, "__CTOR_LIST__");
1179 strcpy (s, "__DTOR_LIST__");
1181 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1182 if (h == (struct bfd_link_hash_entry *) NULL)
1183 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1184 if (h->type == bfd_link_hash_new)
1186 h->type = bfd_link_hash_undefined;
1187 h->u.undef.abfd = abfd;
1188 /* We don't call bfd_link_add_undef to add this to the list of
1189 undefined symbols because we are going to define it
1193 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1197 /* A structure used by warning_callback to pass information through
1198 bfd_map_over_sections. */
1200 struct warning_callback_info
1203 const char *warning;
1208 /* This is called when there is a reference to a warning symbol. */
1211 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1212 const char *warning,
1218 /* This is a hack to support warn_multiple_gp. FIXME: This should
1219 have a cleaner interface, but what? */
1220 if (! config.warn_multiple_gp
1221 && strcmp (warning, "using multiple gp values") == 0)
1224 if (section != NULL)
1225 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1226 else if (abfd == NULL)
1227 einfo ("%P: %s%s\n", _("warning: "), warning);
1228 else if (symbol == NULL)
1229 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1232 lang_input_statement_type *entry;
1234 struct warning_callback_info info;
1236 /* Look through the relocs to see if we can find a plausible
1238 entry = (lang_input_statement_type *) abfd->usrdata;
1239 if (entry != NULL && entry->asymbols != NULL)
1240 asymbols = entry->asymbols;
1246 symsize = bfd_get_symtab_upper_bound (abfd);
1248 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1249 asymbols = xmalloc (symsize);
1250 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1251 if (symbol_count < 0)
1252 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1255 entry->asymbols = asymbols;
1256 entry->symbol_count = symbol_count;
1261 info.warning = warning;
1262 info.symbol = symbol;
1263 info.asymbols = asymbols;
1264 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1267 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1276 /* This is called by warning_callback for each section. It checks the
1277 relocs of the section to see if it can find a reference to the
1278 symbol which triggered the warning. If it can, it uses the reloc
1279 to give an error message with a file and line number. */
1282 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1284 struct warning_callback_info *info = iarg;
1288 arelent **p, **pend;
1293 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1295 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1299 relpp = xmalloc (relsize);
1300 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1302 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1305 pend = p + relcount;
1306 for (; p < pend && *p != NULL; p++)
1310 if (q->sym_ptr_ptr != NULL
1311 && *q->sym_ptr_ptr != NULL
1312 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1314 /* We found a reloc for the symbol we are looking for. */
1315 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1325 /* This is called when an undefined symbol is found. */
1328 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1335 static char *error_name;
1336 static unsigned int error_count;
1338 #define MAX_ERRORS_IN_A_ROW 5
1340 if (config.warn_once)
1342 static struct bfd_hash_table *hash;
1344 /* Only warn once about a particular undefined symbol. */
1347 hash = xmalloc (sizeof (struct bfd_hash_table));
1348 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1349 sizeof (struct bfd_hash_entry)))
1350 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1353 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1356 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1357 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1360 /* We never print more than a reasonable number of errors in a row
1361 for a single symbol. */
1362 if (error_name != NULL
1363 && strcmp (name, error_name) == 0)
1368 if (error_name != NULL)
1370 error_name = xstrdup (name);
1373 if (section != NULL)
1375 if (error_count < MAX_ERRORS_IN_A_ROW)
1378 einfo (_("%X%C: undefined reference to `%T'\n"),
1379 abfd, section, address, name);
1381 einfo (_("%C: warning: undefined reference to `%T'\n"),
1382 abfd, section, address, name);
1384 else if (error_count == MAX_ERRORS_IN_A_ROW)
1387 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1388 abfd, section, address, name);
1390 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1391 abfd, section, address, name);
1398 if (error_count < MAX_ERRORS_IN_A_ROW)
1401 einfo (_("%X%B: undefined reference to `%T'\n"),
1404 einfo (_("%B: warning: undefined reference to `%T'\n"),
1407 else if (error_count == MAX_ERRORS_IN_A_ROW)
1410 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1413 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1423 /* Counter to limit the number of relocation overflow error messages
1424 to print. Errors are printed as it is decremented. When it's
1425 called and the counter is zero, a final message is printed
1426 indicating more relocations were omitted. When it gets to -1, no
1427 such errors are printed. If it's initially set to a value less
1428 than -1, all such errors will be printed (--verbose does this). */
1430 int overflow_cutoff_limit = 10;
1432 /* This is called when a reloc overflows. */
1435 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1436 struct bfd_link_hash_entry *entry,
1438 const char *reloc_name,
1444 if (overflow_cutoff_limit == -1)
1447 einfo ("%X%C:", abfd, section, address);
1449 if (overflow_cutoff_limit >= 0
1450 && overflow_cutoff_limit-- == 0)
1452 einfo (_(" additional relocation overflows omitted from the output\n"));
1458 while (entry->type == bfd_link_hash_indirect
1459 || entry->type == bfd_link_hash_warning)
1460 entry = entry->u.i.link;
1461 switch (entry->type)
1463 case bfd_link_hash_undefined:
1464 case bfd_link_hash_undefweak:
1465 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1466 reloc_name, entry->root.string);
1468 case bfd_link_hash_defined:
1469 case bfd_link_hash_defweak:
1470 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1471 reloc_name, entry->root.string,
1472 entry->u.def.section,
1473 entry->u.def.section == bfd_abs_section_ptr
1474 ? output_bfd : entry->u.def.section->owner);
1482 einfo (_(" relocation truncated to fit: %s against `%T'"),
1485 einfo ("+%v", addend);
1490 /* This is called when a dangerous relocation is made. */
1493 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1494 const char *message,
1499 einfo (_("%X%C: dangerous relocation: %s\n"),
1500 abfd, section, address, message);
1504 /* This is called when a reloc is being generated attached to a symbol
1505 that is not being output. */
1508 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1514 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1515 abfd, section, address, name);
1519 /* This is called if link_info.notice_all is set, or when a symbol in
1520 link_info.notice_hash is found. Symbols are put in notice_hash
1521 using the -y option. */
1524 notice (struct bfd_link_info *info,
1532 if (command_line.cref || nocrossref_list != NULL)
1533 return handle_asneeded_cref (abfd, value);
1537 if (! info->notice_all
1538 || (info->notice_hash != NULL
1539 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1541 if (bfd_is_und_section (section))
1542 einfo ("%B: reference to %s\n", abfd, name);
1544 einfo ("%B: definition of %s\n", abfd, name);
1547 if (command_line.cref || nocrossref_list != NULL)
1548 add_cref (name, abfd, section, value);