1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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, 59 Temple Place - Suite 330, 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)
53 #ifdef NEED_DECLARATION_SBRK
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. */
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 char *get_emulation
115 static void set_scripts_dir
117 static bfd_boolean add_archive_element
118 (struct bfd_link_info *, bfd *, const char *);
119 static bfd_boolean multiple_definition
120 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
121 bfd *, asection *, bfd_vma);
122 static bfd_boolean multiple_common
123 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
124 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
125 static bfd_boolean add_to_set
126 (struct bfd_link_info *, struct bfd_link_hash_entry *,
127 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
128 static bfd_boolean constructor_callback
129 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
130 asection *, bfd_vma);
131 static bfd_boolean warning_callback
132 (struct bfd_link_info *, const char *, const char *, bfd *,
133 asection *, bfd_vma);
134 static void warning_find_reloc
135 (bfd *, asection *, void *);
136 static bfd_boolean undefined_symbol
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
139 static bfd_boolean reloc_overflow
140 (struct bfd_link_info *, const char *, const char *, bfd_vma,
141 bfd *, asection *, bfd_vma);
142 static bfd_boolean reloc_dangerous
143 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
144 static bfd_boolean unattached_reloc
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean notice
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
149 static struct bfd_link_callbacks link_callbacks =
155 constructor_callback,
164 struct bfd_link_info link_info;
172 bfd_cache_close (output_bfd);
173 if (delete_output_file_on_failure)
174 unlink (output_filename);
179 main (int argc, char **argv)
182 long start_time = get_run_time ();
184 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
185 setlocale (LC_MESSAGES, "");
187 #if defined (HAVE_SETLOCALE)
188 setlocale (LC_CTYPE, "");
190 bindtextdomain (PACKAGE, LOCALEDIR);
191 textdomain (PACKAGE);
193 program_name = argv[0];
194 xmalloc_set_program_name (program_name);
196 START_PROGRESS (program_name, 0);
200 bfd_set_error_program_name (program_name);
202 xatexit (remove_output);
204 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
205 ld_sysroot = make_relative_prefix (program_name, BINDIR,
211 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
222 ld_sysroot = make_relative_prefix (program_name, TOOLBINDIR,
228 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
240 ld_sysroot = TARGET_SYSTEM_ROOT;
242 if (ld_sysroot && *ld_sysroot)
243 ld_canon_sysroot = lrealpath (ld_sysroot);
245 if (ld_canon_sysroot)
246 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
248 ld_canon_sysroot_len = -1;
250 /* Set the default BFD target based on the configured target. Doing
251 this permits the linker to be configured for a particular target,
252 and linked against a shared BFD library which was configured for
253 a different target. The macro TARGET is defined by Makefile. */
254 if (! bfd_set_default_target (TARGET))
256 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
267 /* Initialize the data about options. */
268 trace_files = trace_file_tries = version_printed = FALSE;
269 whole_archive = FALSE;
270 config.build_constructors = TRUE;
271 config.dynamic_link = FALSE;
272 config.has_shared = FALSE;
273 config.split_by_reloc = (unsigned) -1;
274 config.split_by_file = (bfd_size_type) -1;
275 config.hash_table_size = 0;
276 command_line.force_common_definition = FALSE;
277 command_line.inhibit_common_definition = FALSE;
278 command_line.interpreter = NULL;
279 command_line.rpath = NULL;
280 command_line.warn_mismatch = TRUE;
281 command_line.check_section_addresses = TRUE;
282 command_line.accept_unknown_input_arch = FALSE;
283 command_line.reduce_memory_overheads = FALSE;
287 /* We initialize DEMANGLING based on the environment variable
288 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
289 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
290 environment. Acting the same way here lets us provide the same
291 interface by default. */
292 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
294 link_info.relocatable = FALSE;
295 link_info.emitrelocations = FALSE;
296 link_info.task_link = FALSE;
297 link_info.shared = FALSE;
298 link_info.pie = FALSE;
299 link_info.executable = FALSE;
300 link_info.symbolic = FALSE;
301 link_info.export_dynamic = FALSE;
302 link_info.static_link = FALSE;
303 link_info.traditional_format = FALSE;
304 link_info.optimize = FALSE;
305 link_info.unresolved_syms_in_objects = RM_NOT_YET_SET;
306 link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET;
307 link_info.allow_multiple_definition = FALSE;
308 link_info.allow_undefined_version = TRUE;
309 link_info.keep_memory = TRUE;
310 link_info.notice_all = FALSE;
311 link_info.nocopyreloc = FALSE;
312 link_info.new_dtags = FALSE;
313 link_info.combreloc = TRUE;
314 link_info.eh_frame_hdr = FALSE;
315 link_info.relro = FALSE;
316 link_info.strip_discarded = TRUE;
317 link_info.strip = strip_none;
318 link_info.discard = discard_sec_merge;
319 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
320 link_info.callbacks = &link_callbacks;
321 link_info.hash = NULL;
322 link_info.keep_hash = NULL;
323 link_info.notice_hash = NULL;
324 link_info.wrap_hash = NULL;
325 link_info.input_bfds = NULL;
326 link_info.create_object_symbols_section = NULL;
327 link_info.gc_sym_list = NULL;
328 link_info.base_file = NULL;
329 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
330 and _fini symbols. We are compatible. */
331 link_info.init_function = "_init";
332 link_info.fini_function = "_fini";
333 link_info.pei386_auto_import = -1;
334 link_info.pei386_runtime_pseudo_reloc = FALSE;
335 link_info.spare_dynamic_tags = 5;
337 link_info.flags_1 = 0;
338 link_info.need_relax_finalize = FALSE;
340 ldfile_add_arch ("");
342 config.make_executable = TRUE;
343 force_make_executable = FALSE;
344 config.magic_demand_paged = TRUE;
345 config.text_read_only = TRUE;
347 emulation = get_emulation (argc, argv);
348 ldemul_choose_mode (emulation);
349 default_target = ldemul_choose_target (argc, argv);
351 ldemul_before_parse ();
352 lang_has_input_file = FALSE;
353 parse_args (argc, argv);
355 if (config.hash_table_size != 0)
356 bfd_hash_set_default_size (config.hash_table_size);
358 ldemul_set_symbols ();
360 if (link_info.relocatable)
362 if (command_line.gc_sections)
363 einfo ("%P%F: --gc-sections and -r may not be used together\n");
364 else if (command_line.relax)
365 einfo (_("%P%F: --relax and -r may not be used together\n"));
366 if (link_info.shared)
367 einfo (_("%P%F: -r and -shared may not be used together\n"));
370 if (! link_info.shared)
372 if (command_line.filter_shlib)
373 einfo (_("%P%F: -F may not be used without -shared\n"));
374 if (command_line.auxiliary_filters)
375 einfo (_("%P%F: -f may not be used without -shared\n"));
378 if (! link_info.shared || link_info.pie)
379 link_info.executable = TRUE;
381 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
382 don't see how else this can be handled, since in this case we
383 must preserve all externally visible symbols. */
384 if (link_info.relocatable && link_info.strip == strip_all)
386 link_info.strip = strip_debugger;
387 if (link_info.discard == discard_sec_merge)
388 link_info.discard = discard_all;
391 /* This essentially adds another -L directory so this must be done after
392 the -L's in argv have been processed. */
395 /* If we have not already opened and parsed a linker script
396 read the emulation's appropriate default script. */
397 if (saved_script_handle == NULL)
400 char *s = ldemul_get_script (&isfile);
403 ldfile_open_command_file (s);
409 parser_input = input_script;
414 if (trace_file_tries)
416 if (saved_script_handle)
417 info_msg (_("using external linker script:"));
419 info_msg (_("using internal linker script:"));
420 info_msg ("\n==================================================\n");
422 if (saved_script_handle)
424 static const int ld_bufsz = 8193;
426 char *buf = xmalloc (ld_bufsz);
428 rewind (saved_script_handle);
429 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
434 rewind (saved_script_handle);
441 info_msg (ldemul_get_script (&isfile));
444 info_msg ("\n==================================================\n");
449 if (!lang_has_input_file)
453 einfo (_("%P%F: no input files\n"));
457 info_msg (_("%P: mode %s\n"), emulation);
459 ldemul_after_parse ();
461 if (config.map_filename)
463 if (strcmp (config.map_filename, "-") == 0)
465 config.map_file = stdout;
469 config.map_file = fopen (config.map_filename, FOPEN_WT);
470 if (config.map_file == (FILE *) NULL)
472 bfd_set_error (bfd_error_system_call);
473 einfo (_("%P%F: cannot open map file %s: %E\n"),
474 config.map_filename);
481 /* Print error messages for any missing symbols, for any warning
482 symbols, and possibly multiple definitions. */
483 if (link_info.relocatable)
484 output_bfd->flags &= ~EXEC_P;
486 output_bfd->flags |= EXEC_P;
490 if (config.map_file != NULL)
492 if (command_line.cref)
493 output_cref (config.map_file != NULL ? config.map_file : stdout);
494 if (nocrossref_list != NULL)
495 check_nocrossrefs ();
497 /* Even if we're producing relocatable output, some non-fatal errors should
498 be reported in the exit status. (What non-fatal errors, if any, do we
499 want to ignore for relocatable output?) */
500 if (!config.make_executable && !force_make_executable)
503 einfo (_("%P: link errors found, deleting executable `%s'\n"),
506 /* The file will be removed by remove_output. */
511 if (! bfd_close (output_bfd))
512 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
514 /* If the --force-exe-suffix is enabled, and we're making an
515 executable file and it doesn't end in .exe, copy it to one
517 if (! link_info.relocatable && command_line.force_exe_suffix)
519 int len = strlen (output_filename);
522 || (strcasecmp (output_filename + len - 4, ".exe") != 0
523 && strcasecmp (output_filename + len - 4, ".dll") != 0))
527 const int bsize = 4096;
528 char *buf = xmalloc (bsize);
530 char *dst_name = xmalloc (len + 5);
532 strcpy (dst_name, output_filename);
533 strcat (dst_name, ".exe");
534 src = fopen (output_filename, FOPEN_RB);
535 dst = fopen (dst_name, FOPEN_WB);
538 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
541 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
543 while ((l = fread (buf, 1, bsize, src)) > 0)
545 int done = fwrite (buf, 1, l, dst);
548 einfo (_("%P: Error writing file `%s'\n"), dst_name);
552 if (fclose (dst) == EOF)
553 einfo (_("%P: Error closing file `%s'\n"), dst_name);
560 END_PROGRESS (program_name);
565 char *lim = sbrk (0);
567 long run_time = get_run_time () - start_time;
569 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
570 program_name, run_time / 1000000, run_time % 1000000);
572 fprintf (stderr, _("%s: data size %ld\n"), program_name,
573 (long) (lim - (char *) &environ));
577 /* Prevent remove_output from doing anything, after a successful link. */
578 output_filename = NULL;
584 /* We need to find any explicitly given emulation in order to initialize the
585 state that's needed by the lex&yacc argument parser (parse_args). */
588 get_emulation (int argc, char **argv)
593 emulation = getenv (EMULATION_ENVIRON);
594 if (emulation == NULL)
595 emulation = DEFAULT_EMULATION;
597 for (i = 1; i < argc; i++)
599 if (!strncmp (argv[i], "-m", 2))
601 if (argv[i][2] == '\0')
606 emulation = argv[i + 1];
610 einfo (_("%P%F: missing argument to -m\n"));
612 else if (strcmp (argv[i], "-mips1") == 0
613 || strcmp (argv[i], "-mips2") == 0
614 || strcmp (argv[i], "-mips3") == 0
615 || strcmp (argv[i], "-mips4") == 0
616 || strcmp (argv[i], "-mips5") == 0
617 || strcmp (argv[i], "-mips32") == 0
618 || strcmp (argv[i], "-mips32r2") == 0
619 || strcmp (argv[i], "-mips64") == 0
620 || strcmp (argv[i], "-mips64r2") == 0)
622 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
623 passed to the linker by some MIPS compilers. They
624 generally tell the linker to use a slightly different
625 library path. Perhaps someday these should be
626 implemented as emulations; until then, we just ignore
627 the arguments and hope that nobody ever creates
628 emulations named ips1, ips2 or ips3. */
630 else if (strcmp (argv[i], "-m486") == 0)
632 /* FIXME: The argument -m486 is passed to the linker on
633 some Linux systems. Hope that nobody creates an
634 emulation named 486. */
639 emulation = &argv[i][2];
647 /* If directory DIR contains an "ldscripts" subdirectory,
648 add DIR to the library search path and return TRUE,
649 else return FALSE. */
652 check_for_scripts_dir (char *dir)
659 dirlen = strlen (dir);
660 /* sizeof counts the terminating NUL. */
661 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
662 sprintf (buf, "%s/ldscripts", dir);
664 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
667 ldfile_add_library_path (dir, FALSE);
671 /* Set the default directory for finding script files.
672 Libraries will be searched for here too, but that's ok.
673 We look for the "ldscripts" directory in:
675 SCRIPTDIR (passed from Makefile)
676 (adjusted according to the current location of the binary)
677 SCRIPTDIR (passed from Makefile)
678 the dir where this program is (for using it from the build tree)
679 the dir where this program is/../lib
680 (for installing the tool suite elsewhere). */
683 set_scripts_dir (void)
689 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
692 found = check_for_scripts_dir (dir);
698 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
701 found = check_for_scripts_dir (dir);
707 if (check_for_scripts_dir (SCRIPTDIR))
708 /* We've been installed normally. */
711 /* Look for "ldscripts" in the dir where our binary is. */
712 end = strrchr (program_name, '/');
713 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
715 /* We could have \foo\bar, or /foo\bar. */
716 char *bslash = strrchr (program_name, '\\');
718 if (end == NULL || (bslash != NULL && bslash > end))
724 /* Don't look for ldscripts in the current directory. There is
725 too much potential for confusion. */
728 dirlen = end - program_name;
729 /* Make a copy of program_name in dir.
730 Leave room for later "/../lib". */
731 dir = xmalloc (dirlen + 8);
732 strncpy (dir, program_name, dirlen);
735 if (check_for_scripts_dir (dir))
741 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
742 strcpy (dir + dirlen, "/../lib");
743 check_for_scripts_dir (dir);
748 add_ysym (const char *name)
750 if (link_info.notice_hash == NULL)
752 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
753 if (! bfd_hash_table_init_n (link_info.notice_hash,
756 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
759 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
760 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
763 /* Record a symbol to be wrapped, from the --wrap option. */
766 add_wrap (const char *name)
768 if (link_info.wrap_hash == NULL)
770 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
771 if (! bfd_hash_table_init_n (link_info.wrap_hash,
774 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
777 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
778 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
781 /* Handle the -retain-symbols-file option. */
784 add_keepsyms_file (const char *filename)
791 if (link_info.strip == strip_some)
792 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
794 file = fopen (filename, "r");
797 bfd_set_error (bfd_error_system_call);
798 einfo ("%X%P: %s: %E\n", filename);
802 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
803 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
804 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
807 buf = xmalloc (bufsize);
819 while (! ISSPACE (c) && c != EOF)
826 buf = xrealloc (buf, bufsize);
833 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
834 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
838 if (link_info.strip != strip_none)
839 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
842 link_info.strip = strip_some;
845 /* Callbacks from the BFD linker routines. */
847 /* This is called when BFD has decided to include an archive member in
851 add_archive_element (struct bfd_link_info *info ATTRIBUTE_UNUSED,
855 lang_input_statement_type *input;
857 input = xmalloc (sizeof (lang_input_statement_type));
858 input->filename = abfd->filename;
859 input->local_sym_name = abfd->filename;
860 input->the_bfd = abfd;
861 input->asymbols = NULL;
863 input->just_syms_flag = FALSE;
864 input->loaded = FALSE;
865 input->search_dirs_flag = FALSE;
867 /* FIXME: The following fields are not set: header.next,
868 header.type, closed, passive_position, symbol_count,
869 next_real_file, is_archive, target, real. This bit of code is
870 from the old decode_library_subfile function. I don't know
871 whether any of those fields matters. */
873 ldlang_add_file (input);
875 if (config.map_file != NULL)
877 static bfd_boolean header_printed;
878 struct bfd_link_hash_entry *h;
882 h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE);
894 case bfd_link_hash_defined:
895 case bfd_link_hash_defweak:
896 from = h->u.def.section->owner;
899 case bfd_link_hash_undefined:
900 case bfd_link_hash_undefweak:
901 from = h->u.undef.abfd;
904 case bfd_link_hash_common:
905 from = h->u.c.p->section->owner;
910 if (! header_printed)
914 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
916 header_printed = TRUE;
919 if (bfd_my_archive (abfd) == NULL)
921 minfo ("%s", bfd_get_filename (abfd));
922 len = strlen (bfd_get_filename (abfd));
926 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
927 bfd_get_filename (abfd));
928 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
929 + strlen (bfd_get_filename (abfd))
947 minfo ("(%T)\n", h->root.string);
949 minfo ("(%s)\n", name);
952 if (trace_files || trace_file_tries)
953 info_msg ("%I\n", input);
958 /* This is called when BFD has discovered a symbol which is defined
962 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
971 /* If either section has the output_section field set to
972 bfd_abs_section_ptr, it means that the section is being
973 discarded, and this is not really a multiple definition at all.
974 FIXME: It would be cleaner to somehow ignore symbols defined in
975 sections which are being discarded. */
976 if ((osec->output_section != NULL
977 && ! bfd_is_abs_section (osec)
978 && bfd_is_abs_section (osec->output_section))
979 || (nsec->output_section != NULL
980 && ! bfd_is_abs_section (nsec)
981 && bfd_is_abs_section (nsec->output_section)))
984 einfo (_("%X%C: multiple definition of `%T'\n"),
985 nbfd, nsec, nval, name);
987 einfo (_("%D: first defined here\n"), obfd, osec, oval);
989 if (command_line.relax)
991 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
992 command_line.relax = 0;
998 /* This is called when there is a definition of a common symbol, or
999 when a common symbol is found for a symbol that is already defined,
1000 or when two common symbols are found. We only do something if
1001 -warn-common was used. */
1004 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1007 enum bfd_link_hash_type otype,
1010 enum bfd_link_hash_type ntype,
1013 if (! config.warn_common)
1016 if (ntype == bfd_link_hash_defined
1017 || ntype == bfd_link_hash_defweak
1018 || ntype == bfd_link_hash_indirect)
1020 ASSERT (otype == bfd_link_hash_common);
1021 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1024 einfo (_("%B: warning: common is here\n"), obfd);
1026 else if (otype == bfd_link_hash_defined
1027 || otype == bfd_link_hash_defweak
1028 || otype == bfd_link_hash_indirect)
1030 ASSERT (ntype == bfd_link_hash_common);
1031 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1034 einfo (_("%B: warning: defined here\n"), obfd);
1038 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1041 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1044 einfo (_("%B: warning: larger common is here\n"), obfd);
1046 else if (nsize > osize)
1048 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1051 einfo (_("%B: warning: smaller common is here\n"), obfd);
1055 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1057 einfo (_("%B: warning: previous common is here\n"), obfd);
1064 /* This is called when BFD has discovered a set element. H is the
1065 entry in the linker hash table for the set. SECTION and VALUE
1066 represent a value which should be added to the set. */
1069 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1070 struct bfd_link_hash_entry *h,
1071 bfd_reloc_code_real_type reloc,
1076 if (config.warn_constructors)
1077 einfo (_("%P: warning: global constructor %s used\n"),
1080 if (! config.build_constructors)
1083 ldctor_add_set_entry (h, reloc, NULL, section, value);
1085 if (h->type == bfd_link_hash_new)
1087 h->type = bfd_link_hash_undefined;
1088 h->u.undef.abfd = abfd;
1089 /* We don't call bfd_link_add_undef to add this to the list of
1090 undefined symbols because we are going to define it
1097 /* This is called when BFD has discovered a constructor. This is only
1098 called for some object file formats--those which do not handle
1099 constructors in some more clever fashion. This is similar to
1100 adding an element to a set, but less general. */
1103 constructor_callback (struct bfd_link_info *info,
1104 bfd_boolean constructor,
1111 struct bfd_link_hash_entry *h;
1112 char set_name[1 + sizeof "__CTOR_LIST__"];
1114 if (config.warn_constructors)
1115 einfo (_("%P: warning: global constructor %s used\n"), name);
1117 if (! config.build_constructors)
1120 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1121 useful error message. */
1122 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1123 && (link_info.relocatable
1124 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1125 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1128 if (bfd_get_symbol_leading_char (abfd) != '\0')
1129 *s++ = bfd_get_symbol_leading_char (abfd);
1131 strcpy (s, "__CTOR_LIST__");
1133 strcpy (s, "__DTOR_LIST__");
1135 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1136 if (h == (struct bfd_link_hash_entry *) NULL)
1137 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1138 if (h->type == bfd_link_hash_new)
1140 h->type = bfd_link_hash_undefined;
1141 h->u.undef.abfd = abfd;
1142 /* We don't call bfd_link_add_undef to add this to the list of
1143 undefined symbols because we are going to define it
1147 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1151 /* A structure used by warning_callback to pass information through
1152 bfd_map_over_sections. */
1154 struct warning_callback_info
1157 const char *warning;
1162 /* This is called when there is a reference to a warning symbol. */
1165 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1166 const char *warning,
1172 /* This is a hack to support warn_multiple_gp. FIXME: This should
1173 have a cleaner interface, but what? */
1174 if (! config.warn_multiple_gp
1175 && strcmp (warning, "using multiple gp values") == 0)
1178 if (section != NULL)
1179 einfo ("%C: %s\n", abfd, section, address, warning);
1180 else if (abfd == NULL)
1181 einfo ("%P: %s\n", warning);
1182 else if (symbol == NULL)
1183 einfo ("%B: %s\n", abfd, warning);
1186 lang_input_statement_type *entry;
1188 struct warning_callback_info info;
1190 /* Look through the relocs to see if we can find a plausible
1192 entry = (lang_input_statement_type *) abfd->usrdata;
1193 if (entry != NULL && entry->asymbols != NULL)
1194 asymbols = entry->asymbols;
1200 symsize = bfd_get_symtab_upper_bound (abfd);
1202 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1203 asymbols = xmalloc (symsize);
1204 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1205 if (symbol_count < 0)
1206 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1209 entry->asymbols = asymbols;
1210 entry->symbol_count = symbol_count;
1215 info.warning = warning;
1216 info.symbol = symbol;
1217 info.asymbols = asymbols;
1218 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1221 einfo ("%B: %s\n", abfd, warning);
1230 /* This is called by warning_callback for each section. It checks the
1231 relocs of the section to see if it can find a reference to the
1232 symbol which triggered the warning. If it can, it uses the reloc
1233 to give an error message with a file and line number. */
1236 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1238 struct warning_callback_info *info = iarg;
1242 arelent **p, **pend;
1247 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1249 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1253 relpp = xmalloc (relsize);
1254 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1256 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1259 pend = p + relcount;
1260 for (; p < pend && *p != NULL; p++)
1264 if (q->sym_ptr_ptr != NULL
1265 && *q->sym_ptr_ptr != NULL
1266 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1268 /* We found a reloc for the symbol we are looking for. */
1269 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1278 /* This is called when an undefined symbol is found. */
1281 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1288 static char *error_name;
1289 static unsigned int error_count;
1291 #define MAX_ERRORS_IN_A_ROW 5
1293 if (config.warn_once)
1295 static struct bfd_hash_table *hash;
1297 /* Only warn once about a particular undefined symbol. */
1300 hash = xmalloc (sizeof (struct bfd_hash_table));
1301 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1302 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1305 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1308 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1309 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1312 /* We never print more than a reasonable number of errors in a row
1313 for a single symbol. */
1314 if (error_name != NULL
1315 && strcmp (name, error_name) == 0)
1320 if (error_name != NULL)
1322 error_name = xstrdup (name);
1325 if (section != NULL)
1327 if (error_count < MAX_ERRORS_IN_A_ROW)
1330 einfo (_("%X%C: undefined reference to `%T'\n"),
1331 abfd, section, address, name);
1333 einfo (_("%C: warning: undefined reference to `%T'\n"),
1334 abfd, section, address, name);
1336 else if (error_count == MAX_ERRORS_IN_A_ROW)
1339 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1340 abfd, section, address, name);
1342 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1343 abfd, section, address, name);
1350 if (error_count < MAX_ERRORS_IN_A_ROW)
1353 einfo (_("%X%B: undefined reference to `%T'\n"),
1356 einfo (_("%B: warning: undefined reference to `%T'\n"),
1359 else if (error_count == MAX_ERRORS_IN_A_ROW)
1362 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1365 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1375 /* Counter to limit the number of relocation overflow error messages
1376 to print. Errors are printed as it is decremented. When it's
1377 called and the counter is zero, a final message is printed
1378 indicating more relocations were omitted. When it gets to -1, no
1379 such errors are printed. If it's initially set to a value less
1380 than -1, all such errors will be printed (--verbose does this). */
1382 int overflow_cutoff_limit = 10;
1384 /* This is called when a reloc overflows. */
1387 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1389 const char *reloc_name,
1395 if (overflow_cutoff_limit == -1)
1399 einfo (_("%P%X: generated"));
1401 einfo ("%X%C:", abfd, section, address);
1403 if (overflow_cutoff_limit >= 0
1404 && overflow_cutoff_limit-- == 0)
1406 einfo (_(" additional relocation overflows omitted from the output\n"));
1410 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1412 einfo ("+%v", addend);
1417 /* This is called when a dangerous relocation is made. */
1420 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1421 const char *message,
1427 einfo (_("%P%X: generated"));
1429 einfo ("%X%C:", abfd, section, address);
1430 einfo (_("dangerous relocation: %s\n"), message);
1434 /* This is called when a reloc is being generated attached to a symbol
1435 that is not being output. */
1438 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1445 einfo (_("%P%X: generated"));
1447 einfo ("%X%C:", abfd, section, address);
1448 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1452 /* This is called if link_info.notice_all is set, or when a symbol in
1453 link_info.notice_hash is found. Symbols are put in notice_hash
1454 using the -y option. */
1457 notice (struct bfd_link_info *info,
1463 if (! info->notice_all
1464 || (info->notice_hash != NULL
1465 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1467 if (bfd_is_und_section (section))
1468 einfo ("%B: reference to %s\n", abfd, name);
1470 einfo ("%B: definition of %s\n", abfd, name);
1473 if (command_line.cref || nocrossref_list != NULL)
1474 add_cref (name, abfd, section, value);