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 /* TRUE if we should demangle symbol names. */
101 bfd_boolean demangling;
103 args_type command_line;
105 ld_config_type config;
107 static char *get_emulation
109 static void set_scripts_dir
111 static bfd_boolean add_archive_element
112 (struct bfd_link_info *, bfd *, const char *);
113 static bfd_boolean multiple_definition
114 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
115 bfd *, asection *, bfd_vma);
116 static bfd_boolean multiple_common
117 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
118 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
119 static bfd_boolean add_to_set
120 (struct bfd_link_info *, struct bfd_link_hash_entry *,
121 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
122 static bfd_boolean constructor_callback
123 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
124 asection *, bfd_vma);
125 static bfd_boolean warning_callback
126 (struct bfd_link_info *, const char *, const char *, bfd *,
127 asection *, bfd_vma);
128 static void warning_find_reloc
129 (bfd *, asection *, void *);
130 static bfd_boolean undefined_symbol
131 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
133 static bfd_boolean reloc_overflow
134 (struct bfd_link_info *, const char *, const char *, bfd_vma,
135 bfd *, asection *, bfd_vma);
136 static bfd_boolean reloc_dangerous
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
138 static bfd_boolean unattached_reloc
139 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
140 static bfd_boolean notice
141 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
143 static struct bfd_link_callbacks link_callbacks =
149 constructor_callback,
159 struct bfd_link_info link_info;
167 bfd_cache_close (output_bfd);
168 if (delete_output_file_on_failure)
169 unlink (output_filename);
174 main (int argc, char **argv)
177 long start_time = get_run_time ();
179 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
180 setlocale (LC_MESSAGES, "");
182 #if defined (HAVE_SETLOCALE)
183 setlocale (LC_CTYPE, "");
185 bindtextdomain (PACKAGE, LOCALEDIR);
186 textdomain (PACKAGE);
188 program_name = argv[0];
189 xmalloc_set_program_name (program_name);
191 START_PROGRESS (program_name, 0);
195 bfd_set_error_program_name (program_name);
197 xatexit (remove_output);
199 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
200 ld_sysroot = make_relative_prefix (program_name, BINDIR,
206 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
217 ld_sysroot = make_relative_prefix (program_name, TOOLBINDIR,
223 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
235 ld_sysroot = TARGET_SYSTEM_ROOT;
237 if (ld_sysroot && *ld_sysroot)
238 ld_canon_sysroot = lrealpath (ld_sysroot);
240 if (ld_canon_sysroot)
241 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
243 ld_canon_sysroot_len = -1;
245 /* Set the default BFD target based on the configured target. Doing
246 this permits the linker to be configured for a particular target,
247 and linked against a shared BFD library which was configured for
248 a different target. The macro TARGET is defined by Makefile. */
249 if (! bfd_set_default_target (TARGET))
251 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
262 /* Initialize the data about options. */
263 trace_files = trace_file_tries = version_printed = FALSE;
264 whole_archive = FALSE;
265 config.build_constructors = TRUE;
266 config.dynamic_link = FALSE;
267 config.has_shared = FALSE;
268 config.split_by_reloc = (unsigned) -1;
269 config.split_by_file = (bfd_size_type) -1;
270 command_line.force_common_definition = FALSE;
271 command_line.inhibit_common_definition = FALSE;
272 command_line.interpreter = NULL;
273 command_line.rpath = NULL;
274 command_line.warn_mismatch = TRUE;
275 command_line.check_section_addresses = TRUE;
276 command_line.accept_unknown_input_arch = FALSE;
278 /* We initialize DEMANGLING based on the environment variable
279 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
280 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
281 environment. Acting the same way here lets us provide the same
282 interface by default. */
283 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
285 link_info.relocatable = FALSE;
286 link_info.emitrelocations = FALSE;
287 link_info.task_link = FALSE;
288 link_info.shared = FALSE;
289 link_info.pie = FALSE;
290 link_info.executable = FALSE;
291 link_info.symbolic = FALSE;
292 link_info.export_dynamic = FALSE;
293 link_info.static_link = FALSE;
294 link_info.traditional_format = FALSE;
295 link_info.optimize = FALSE;
296 link_info.unresolved_syms_in_objects = RM_NOT_YET_SET;
297 link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET;
298 link_info.allow_multiple_definition = FALSE;
299 link_info.allow_undefined_version = TRUE;
300 link_info.keep_memory = TRUE;
301 link_info.notice_all = FALSE;
302 link_info.nocopyreloc = FALSE;
303 link_info.new_dtags = FALSE;
304 link_info.combreloc = TRUE;
305 link_info.eh_frame_hdr = FALSE;
306 link_info.relro = FALSE;
307 link_info.strip_discarded = TRUE;
308 link_info.strip = strip_none;
309 link_info.discard = discard_sec_merge;
310 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
311 link_info.callbacks = &link_callbacks;
312 link_info.hash = NULL;
313 link_info.keep_hash = NULL;
314 link_info.notice_hash = NULL;
315 link_info.wrap_hash = NULL;
316 link_info.input_bfds = NULL;
317 link_info.create_object_symbols_section = NULL;
318 link_info.gc_sym_list = NULL;
319 link_info.base_file = NULL;
320 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
321 and _fini symbols. We are compatible. */
322 link_info.init_function = "_init";
323 link_info.fini_function = "_fini";
324 link_info.pei386_auto_import = -1;
325 link_info.pei386_runtime_pseudo_reloc = FALSE;
326 link_info.spare_dynamic_tags = 5;
328 link_info.flags_1 = 0;
329 link_info.need_relax_finalize = FALSE;
331 ldfile_add_arch ("");
333 config.make_executable = TRUE;
334 force_make_executable = FALSE;
335 config.magic_demand_paged = TRUE;
336 config.text_read_only = TRUE;
338 emulation = get_emulation (argc, argv);
339 ldemul_choose_mode (emulation);
340 default_target = ldemul_choose_target (argc, argv);
342 ldemul_before_parse ();
343 lang_has_input_file = FALSE;
344 parse_args (argc, argv);
346 ldemul_set_symbols ();
348 if (link_info.relocatable)
350 if (command_line.gc_sections)
351 einfo ("%P%F: --gc-sections and -r may not be used together\n");
352 else if (command_line.relax)
353 einfo (_("%P%F: --relax and -r may not be used together\n"));
354 if (link_info.shared)
355 einfo (_("%P%F: -r and -shared may not be used together\n"));
358 if (! link_info.shared)
360 if (command_line.filter_shlib)
361 einfo (_("%P%F: -F may not be used without -shared\n"));
362 if (command_line.auxiliary_filters)
363 einfo (_("%P%F: -f may not be used without -shared\n"));
366 if (! link_info.shared || link_info.pie)
367 link_info.executable = TRUE;
369 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
370 don't see how else this can be handled, since in this case we
371 must preserve all externally visible symbols. */
372 if (link_info.relocatable && link_info.strip == strip_all)
374 link_info.strip = strip_debugger;
375 if (link_info.discard == discard_sec_merge)
376 link_info.discard = discard_all;
379 /* This essentially adds another -L directory so this must be done after
380 the -L's in argv have been processed. */
383 /* If we have not already opened and parsed a linker script
384 read the emulation's appropriate default script. */
385 if (saved_script_handle == NULL)
388 char *s = ldemul_get_script (&isfile);
391 ldfile_open_command_file (s);
397 parser_input = input_script;
402 if (trace_file_tries)
404 if (saved_script_handle)
405 info_msg (_("using external linker script:"));
407 info_msg (_("using internal linker script:"));
408 info_msg ("\n==================================================\n");
410 if (saved_script_handle)
412 static const int ld_bufsz = 8193;
414 char *buf = xmalloc (ld_bufsz);
416 rewind (saved_script_handle);
417 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
422 rewind (saved_script_handle);
429 info_msg (ldemul_get_script (&isfile));
432 info_msg ("\n==================================================\n");
437 if (!lang_has_input_file)
441 einfo (_("%P%F: no input files\n"));
445 info_msg (_("%P: mode %s\n"), emulation);
447 ldemul_after_parse ();
449 if (config.map_filename)
451 if (strcmp (config.map_filename, "-") == 0)
453 config.map_file = stdout;
457 config.map_file = fopen (config.map_filename, FOPEN_WT);
458 if (config.map_file == (FILE *) NULL)
460 bfd_set_error (bfd_error_system_call);
461 einfo (_("%P%F: cannot open map file %s: %E\n"),
462 config.map_filename);
469 /* Print error messages for any missing symbols, for any warning
470 symbols, and possibly multiple definitions. */
471 if (link_info.relocatable)
472 output_bfd->flags &= ~EXEC_P;
474 output_bfd->flags |= EXEC_P;
478 if (config.map_file != NULL)
480 if (command_line.cref)
481 output_cref (config.map_file != NULL ? config.map_file : stdout);
482 if (nocrossref_list != NULL)
483 check_nocrossrefs ();
485 /* Even if we're producing relocatable output, some non-fatal errors should
486 be reported in the exit status. (What non-fatal errors, if any, do we
487 want to ignore for relocatable output?) */
488 if (!config.make_executable && !force_make_executable)
491 einfo (_("%P: link errors found, deleting executable `%s'\n"),
494 /* The file will be removed by remove_output. */
499 if (! bfd_close (output_bfd))
500 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
502 /* If the --force-exe-suffix is enabled, and we're making an
503 executable file and it doesn't end in .exe, copy it to one
505 if (! link_info.relocatable && command_line.force_exe_suffix)
507 int len = strlen (output_filename);
510 || (strcasecmp (output_filename + len - 4, ".exe") != 0
511 && strcasecmp (output_filename + len - 4, ".dll") != 0))
515 const int bsize = 4096;
516 char *buf = xmalloc (bsize);
518 char *dst_name = xmalloc (len + 5);
520 strcpy (dst_name, output_filename);
521 strcat (dst_name, ".exe");
522 src = fopen (output_filename, FOPEN_RB);
523 dst = fopen (dst_name, FOPEN_WB);
526 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
529 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
531 while ((l = fread (buf, 1, bsize, src)) > 0)
533 int done = fwrite (buf, 1, l, dst);
536 einfo (_("%P: Error writing file `%s'\n"), dst_name);
540 if (fclose (dst) == EOF)
541 einfo (_("%P: Error closing file `%s'\n"), dst_name);
548 END_PROGRESS (program_name);
553 char *lim = sbrk (0);
555 long run_time = get_run_time () - start_time;
557 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
558 program_name, run_time / 1000000, run_time % 1000000);
560 fprintf (stderr, _("%s: data size %ld\n"), program_name,
561 (long) (lim - (char *) &environ));
565 /* Prevent remove_output from doing anything, after a successful link. */
566 output_filename = NULL;
572 /* We need to find any explicitly given emulation in order to initialize the
573 state that's needed by the lex&yacc argument parser (parse_args). */
576 get_emulation (int argc, char **argv)
581 emulation = getenv (EMULATION_ENVIRON);
582 if (emulation == NULL)
583 emulation = DEFAULT_EMULATION;
585 for (i = 1; i < argc; i++)
587 if (!strncmp (argv[i], "-m", 2))
589 if (argv[i][2] == '\0')
594 emulation = argv[i + 1];
598 einfo (_("%P%F: missing argument to -m\n"));
600 else if (strcmp (argv[i], "-mips1") == 0
601 || strcmp (argv[i], "-mips2") == 0
602 || strcmp (argv[i], "-mips3") == 0
603 || strcmp (argv[i], "-mips4") == 0
604 || strcmp (argv[i], "-mips5") == 0
605 || strcmp (argv[i], "-mips32") == 0
606 || strcmp (argv[i], "-mips32r2") == 0
607 || strcmp (argv[i], "-mips64") == 0
608 || strcmp (argv[i], "-mips64r2") == 0)
610 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
611 passed to the linker by some MIPS compilers. They
612 generally tell the linker to use a slightly different
613 library path. Perhaps someday these should be
614 implemented as emulations; until then, we just ignore
615 the arguments and hope that nobody ever creates
616 emulations named ips1, ips2 or ips3. */
618 else if (strcmp (argv[i], "-m486") == 0)
620 /* FIXME: The argument -m486 is passed to the linker on
621 some Linux systems. Hope that nobody creates an
622 emulation named 486. */
627 emulation = &argv[i][2];
635 /* If directory DIR contains an "ldscripts" subdirectory,
636 add DIR to the library search path and return TRUE,
637 else return FALSE. */
640 check_for_scripts_dir (char *dir)
647 dirlen = strlen (dir);
648 /* sizeof counts the terminating NUL. */
649 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
650 sprintf (buf, "%s/ldscripts", dir);
652 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
655 ldfile_add_library_path (dir, FALSE);
659 /* Set the default directory for finding script files.
660 Libraries will be searched for here too, but that's ok.
661 We look for the "ldscripts" directory in:
663 SCRIPTDIR (passed from Makefile)
664 (adjusted according to the current location of the binary)
665 SCRIPTDIR (passed from Makefile)
666 the dir where this program is (for using it from the build tree)
667 the dir where this program is/../lib
668 (for installing the tool suite elsewhere). */
671 set_scripts_dir (void)
677 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
680 found = check_for_scripts_dir (dir);
686 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
689 found = check_for_scripts_dir (dir);
695 if (check_for_scripts_dir (SCRIPTDIR))
696 /* We've been installed normally. */
699 /* Look for "ldscripts" in the dir where our binary is. */
700 end = strrchr (program_name, '/');
701 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
703 /* We could have \foo\bar, or /foo\bar. */
704 char *bslash = strrchr (program_name, '\\');
706 if (end == NULL || (bslash != NULL && bslash > end))
712 /* Don't look for ldscripts in the current directory. There is
713 too much potential for confusion. */
716 dirlen = end - program_name;
717 /* Make a copy of program_name in dir.
718 Leave room for later "/../lib". */
719 dir = xmalloc (dirlen + 8);
720 strncpy (dir, program_name, dirlen);
723 if (check_for_scripts_dir (dir))
729 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
730 strcpy (dir + dirlen, "/../lib");
731 check_for_scripts_dir (dir);
736 add_ysym (const char *name)
738 if (link_info.notice_hash == NULL)
740 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
741 if (! bfd_hash_table_init_n (link_info.notice_hash,
744 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
747 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
748 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
751 /* Record a symbol to be wrapped, from the --wrap option. */
754 add_wrap (const char *name)
756 if (link_info.wrap_hash == NULL)
758 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
759 if (! bfd_hash_table_init_n (link_info.wrap_hash,
762 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
765 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
766 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
769 /* Handle the -retain-symbols-file option. */
772 add_keepsyms_file (const char *filename)
779 if (link_info.strip == strip_some)
780 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
782 file = fopen (filename, "r");
785 bfd_set_error (bfd_error_system_call);
786 einfo ("%X%P: %s: %E\n", filename);
790 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
791 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
792 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
795 buf = xmalloc (bufsize);
807 while (! ISSPACE (c) && c != EOF)
814 buf = xrealloc (buf, bufsize);
821 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
822 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
826 if (link_info.strip != strip_none)
827 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
830 link_info.strip = strip_some;
833 /* Callbacks from the BFD linker routines. */
835 /* This is called when BFD has decided to include an archive member in
839 add_archive_element (struct bfd_link_info *info ATTRIBUTE_UNUSED,
843 lang_input_statement_type *input;
845 input = xmalloc (sizeof (lang_input_statement_type));
846 input->filename = abfd->filename;
847 input->local_sym_name = abfd->filename;
848 input->the_bfd = abfd;
849 input->asymbols = NULL;
851 input->just_syms_flag = FALSE;
852 input->loaded = FALSE;
853 input->search_dirs_flag = FALSE;
855 /* FIXME: The following fields are not set: header.next,
856 header.type, closed, passive_position, symbol_count,
857 next_real_file, is_archive, target, real. This bit of code is
858 from the old decode_library_subfile function. I don't know
859 whether any of those fields matters. */
861 ldlang_add_file (input);
863 if (config.map_file != NULL)
865 static bfd_boolean header_printed;
866 struct bfd_link_hash_entry *h;
870 h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE);
882 case bfd_link_hash_defined:
883 case bfd_link_hash_defweak:
884 from = h->u.def.section->owner;
887 case bfd_link_hash_undefined:
888 case bfd_link_hash_undefweak:
889 from = h->u.undef.abfd;
892 case bfd_link_hash_common:
893 from = h->u.c.p->section->owner;
898 if (! header_printed)
902 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
904 header_printed = TRUE;
907 if (bfd_my_archive (abfd) == NULL)
909 minfo ("%s", bfd_get_filename (abfd));
910 len = strlen (bfd_get_filename (abfd));
914 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
915 bfd_get_filename (abfd));
916 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
917 + strlen (bfd_get_filename (abfd))
935 minfo ("(%T)\n", h->root.string);
937 minfo ("(%s)\n", name);
940 if (trace_files || trace_file_tries)
941 info_msg ("%I\n", input);
946 /* This is called when BFD has discovered a symbol which is defined
950 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
959 /* If either section has the output_section field set to
960 bfd_abs_section_ptr, it means that the section is being
961 discarded, and this is not really a multiple definition at all.
962 FIXME: It would be cleaner to somehow ignore symbols defined in
963 sections which are being discarded. */
964 if ((osec->output_section != NULL
965 && ! bfd_is_abs_section (osec)
966 && bfd_is_abs_section (osec->output_section))
967 || (nsec->output_section != NULL
968 && ! bfd_is_abs_section (nsec)
969 && bfd_is_abs_section (nsec->output_section)))
972 einfo (_("%X%C: multiple definition of `%T'\n"),
973 nbfd, nsec, nval, name);
975 einfo (_("%D: first defined here\n"), obfd, osec, oval);
977 if (command_line.relax)
979 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
980 command_line.relax = 0;
986 /* This is called when there is a definition of a common symbol, or
987 when a common symbol is found for a symbol that is already defined,
988 or when two common symbols are found. We only do something if
989 -warn-common was used. */
992 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
995 enum bfd_link_hash_type otype,
998 enum bfd_link_hash_type ntype,
1001 if (! config.warn_common)
1004 if (ntype == bfd_link_hash_defined
1005 || ntype == bfd_link_hash_defweak
1006 || ntype == bfd_link_hash_indirect)
1008 ASSERT (otype == bfd_link_hash_common);
1009 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1012 einfo (_("%B: warning: common is here\n"), obfd);
1014 else if (otype == bfd_link_hash_defined
1015 || otype == bfd_link_hash_defweak
1016 || otype == bfd_link_hash_indirect)
1018 ASSERT (ntype == bfd_link_hash_common);
1019 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1022 einfo (_("%B: warning: defined here\n"), obfd);
1026 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1029 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1032 einfo (_("%B: warning: larger common is here\n"), obfd);
1034 else if (nsize > osize)
1036 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1039 einfo (_("%B: warning: smaller common is here\n"), obfd);
1043 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1045 einfo (_("%B: warning: previous common is here\n"), obfd);
1052 /* This is called when BFD has discovered a set element. H is the
1053 entry in the linker hash table for the set. SECTION and VALUE
1054 represent a value which should be added to the set. */
1057 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1058 struct bfd_link_hash_entry *h,
1059 bfd_reloc_code_real_type reloc,
1064 if (config.warn_constructors)
1065 einfo (_("%P: warning: global constructor %s used\n"),
1068 if (! config.build_constructors)
1071 ldctor_add_set_entry (h, reloc, NULL, section, value);
1073 if (h->type == bfd_link_hash_new)
1075 h->type = bfd_link_hash_undefined;
1076 h->u.undef.abfd = abfd;
1077 /* We don't call bfd_link_add_undef to add this to the list of
1078 undefined symbols because we are going to define it
1085 /* This is called when BFD has discovered a constructor. This is only
1086 called for some object file formats--those which do not handle
1087 constructors in some more clever fashion. This is similar to
1088 adding an element to a set, but less general. */
1091 constructor_callback (struct bfd_link_info *info,
1092 bfd_boolean constructor,
1099 struct bfd_link_hash_entry *h;
1100 char set_name[1 + sizeof "__CTOR_LIST__"];
1102 if (config.warn_constructors)
1103 einfo (_("%P: warning: global constructor %s used\n"), name);
1105 if (! config.build_constructors)
1108 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1109 useful error message. */
1110 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1111 && (link_info.relocatable
1112 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1113 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1116 if (bfd_get_symbol_leading_char (abfd) != '\0')
1117 *s++ = bfd_get_symbol_leading_char (abfd);
1119 strcpy (s, "__CTOR_LIST__");
1121 strcpy (s, "__DTOR_LIST__");
1123 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1124 if (h == (struct bfd_link_hash_entry *) NULL)
1125 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1126 if (h->type == bfd_link_hash_new)
1128 h->type = bfd_link_hash_undefined;
1129 h->u.undef.abfd = abfd;
1130 /* We don't call bfd_link_add_undef to add this to the list of
1131 undefined symbols because we are going to define it
1135 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1139 /* A structure used by warning_callback to pass information through
1140 bfd_map_over_sections. */
1142 struct warning_callback_info
1145 const char *warning;
1150 /* This is called when there is a reference to a warning symbol. */
1153 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1154 const char *warning,
1160 /* This is a hack to support warn_multiple_gp. FIXME: This should
1161 have a cleaner interface, but what? */
1162 if (! config.warn_multiple_gp
1163 && strcmp (warning, "using multiple gp values") == 0)
1166 if (section != NULL)
1167 einfo ("%C: %s\n", abfd, section, address, warning);
1168 else if (abfd == NULL)
1169 einfo ("%P: %s\n", warning);
1170 else if (symbol == NULL)
1171 einfo ("%B: %s\n", abfd, warning);
1174 lang_input_statement_type *entry;
1176 struct warning_callback_info info;
1178 /* Look through the relocs to see if we can find a plausible
1180 entry = (lang_input_statement_type *) abfd->usrdata;
1181 if (entry != NULL && entry->asymbols != NULL)
1182 asymbols = entry->asymbols;
1188 symsize = bfd_get_symtab_upper_bound (abfd);
1190 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1191 asymbols = xmalloc (symsize);
1192 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1193 if (symbol_count < 0)
1194 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1197 entry->asymbols = asymbols;
1198 entry->symbol_count = symbol_count;
1203 info.warning = warning;
1204 info.symbol = symbol;
1205 info.asymbols = asymbols;
1206 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1209 einfo ("%B: %s\n", abfd, warning);
1218 /* This is called by warning_callback for each section. It checks the
1219 relocs of the section to see if it can find a reference to the
1220 symbol which triggered the warning. If it can, it uses the reloc
1221 to give an error message with a file and line number. */
1224 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1226 struct warning_callback_info *info = iarg;
1230 arelent **p, **pend;
1235 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1237 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1241 relpp = xmalloc (relsize);
1242 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1244 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1247 pend = p + relcount;
1248 for (; p < pend && *p != NULL; p++)
1252 if (q->sym_ptr_ptr != NULL
1253 && *q->sym_ptr_ptr != NULL
1254 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1256 /* We found a reloc for the symbol we are looking for. */
1257 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1266 /* This is called when an undefined symbol is found. */
1269 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1276 static char *error_name;
1277 static unsigned int error_count;
1279 #define MAX_ERRORS_IN_A_ROW 5
1281 if (config.warn_once)
1283 static struct bfd_hash_table *hash;
1285 /* Only warn once about a particular undefined symbol. */
1288 hash = xmalloc (sizeof (struct bfd_hash_table));
1289 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1290 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1293 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1296 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1297 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1300 /* We never print more than a reasonable number of errors in a row
1301 for a single symbol. */
1302 if (error_name != NULL
1303 && strcmp (name, error_name) == 0)
1308 if (error_name != NULL)
1310 error_name = xstrdup (name);
1313 if (section != NULL)
1315 if (error_count < MAX_ERRORS_IN_A_ROW)
1318 einfo (_("%X%C: undefined reference to `%T'\n"),
1319 abfd, section, address, name);
1321 einfo (_("%C: warning: undefined reference to `%T'\n"),
1322 abfd, section, address, name);
1324 else if (error_count == MAX_ERRORS_IN_A_ROW)
1327 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1328 abfd, section, address, name);
1330 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1331 abfd, section, address, name);
1338 if (error_count < MAX_ERRORS_IN_A_ROW)
1341 einfo (_("%X%B: undefined reference to `%T'\n"),
1344 einfo (_("%B: warning: undefined reference to `%T'\n"),
1347 else if (error_count == MAX_ERRORS_IN_A_ROW)
1350 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1353 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1363 /* Counter to limit the number of relocation overflow error messages
1364 to print. Errors are printed as it is decremented. When it's
1365 called and the counter is zero, a final message is printed
1366 indicating more relocations were omitted. When it gets to -1, no
1367 such errors are printed. If it's initially set to a value less
1368 than -1, all such errors will be printed (--verbose does this). */
1370 int overflow_cutoff_limit = 10;
1372 /* This is called when a reloc overflows. */
1375 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1377 const char *reloc_name,
1383 if (overflow_cutoff_limit == -1)
1387 einfo (_("%P%X: generated"));
1389 einfo ("%X%C:", abfd, section, address);
1391 if (overflow_cutoff_limit >= 0
1392 && overflow_cutoff_limit-- == 0)
1394 einfo (_(" additional relocation overflows omitted from the output\n"));
1398 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1400 einfo ("+%v", addend);
1405 /* This is called when a dangerous relocation is made. */
1408 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1409 const char *message,
1415 einfo (_("%P%X: generated"));
1417 einfo ("%X%C:", abfd, section, address);
1418 einfo (_("dangerous relocation: %s\n"), message);
1422 /* This is called when a reloc is being generated attached to a symbol
1423 that is not being output. */
1426 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1433 einfo (_("%P%X: generated"));
1435 einfo ("%X%C:", abfd, section, address);
1436 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1440 /* This is called if link_info.notice_all is set, or when a symbol in
1441 link_info.notice_hash is found. Symbols are put in notice_hash
1442 using the -y option. */
1445 notice (struct bfd_link_info *info,
1451 if (! info->notice_all
1452 || (info->notice_hash != NULL
1453 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1455 if (bfd_is_und_section (section))
1456 einfo ("%B: reference to %s\n", abfd, name);
1458 einfo ("%B: definition of %s\n", abfd, name);
1461 if (command_line.cref || nocrossref_list != NULL)
1462 add_cref (name, abfd, section, value);