1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of the GNU Binutils.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
26 #include "safe-ctype.h"
27 #include "libiberty.h"
30 #include "filenames.h"
44 /* Somewhere above, sys/stat.h got included. */
45 #if !defined(S_ISDIR) && defined(S_IFDIR)
46 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
57 #ifndef TARGET_SYSTEM_ROOT
58 #define TARGET_SYSTEM_ROOT ""
63 FILE *saved_script_handle = NULL;
64 FILE *previous_script_handle = NULL;
65 bfd_boolean force_make_executable = FALSE;
68 const char *output_filename = "a.out";
70 /* Name this program was invoked by. */
73 /* The prefix for system library directories. */
74 const char *ld_sysroot;
76 /* The canonical representation of ld_sysroot. */
77 char * ld_canon_sysroot;
78 int ld_canon_sysroot_len;
80 /* Set by -G argument, for MIPS ECOFF target. */
81 int g_switch_value = 8;
83 /* Nonzero means print names of input files as processed. */
84 bfd_boolean trace_files;
86 /* Nonzero means same, but note open failures, too. */
87 bfd_boolean trace_file_tries;
89 /* Nonzero means version number was printed, so exit successfully
90 instead of complaining if no input files are given. */
91 bfd_boolean version_printed;
93 /* Nonzero means link in every member of an archive. */
94 bfd_boolean whole_archive;
96 /* True means only create DT_NEEDED entries for dynamic libraries
97 if they actually satisfy some reference in a regular object. */
98 bfd_boolean add_DT_NEEDED_for_regular;
100 /* True means create DT_NEEDED entries for dynamic libraries that
101 are DT_NEEDED by dynamic libraries specifically mentioned on
103 bfd_boolean add_DT_NEEDED_for_dynamic = TRUE;
105 /* TRUE if we should demangle symbol names. */
106 bfd_boolean demangling;
108 args_type command_line;
110 ld_config_type config;
112 sort_type sort_section;
114 static const char *get_sysroot
116 static char *get_emulation
118 static bfd_boolean add_archive_element
119 (struct bfd_link_info *, bfd *, const char *);
120 static bfd_boolean multiple_definition
121 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
122 bfd *, asection *, bfd_vma);
123 static bfd_boolean multiple_common
124 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
125 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
126 static bfd_boolean add_to_set
127 (struct bfd_link_info *, struct bfd_link_hash_entry *,
128 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
129 static bfd_boolean constructor_callback
130 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
131 asection *, bfd_vma);
132 static bfd_boolean warning_callback
133 (struct bfd_link_info *, const char *, const char *, bfd *,
134 asection *, bfd_vma);
135 static void warning_find_reloc
136 (bfd *, asection *, void *);
137 static bfd_boolean undefined_symbol
138 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
140 static bfd_boolean reloc_overflow
141 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
142 const char *, bfd_vma, bfd *, asection *, bfd_vma);
143 static bfd_boolean reloc_dangerous
144 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
145 static bfd_boolean unattached_reloc
146 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
147 static bfd_boolean notice
148 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
150 static struct bfd_link_callbacks link_callbacks =
156 constructor_callback,
166 ldlang_override_segment_assignment
169 struct bfd_link_info link_info;
176 if (link_info.output_bfd)
177 bfd_cache_close (link_info.output_bfd);
178 if (delete_output_file_on_failure)
179 unlink_if_ordinary (output_filename);
184 main (int argc, char **argv)
187 long start_time = get_run_time ();
189 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
190 setlocale (LC_MESSAGES, "");
192 #if defined (HAVE_SETLOCALE)
193 setlocale (LC_CTYPE, "");
195 bindtextdomain (PACKAGE, LOCALEDIR);
196 textdomain (PACKAGE);
198 program_name = argv[0];
199 xmalloc_set_program_name (program_name);
201 START_PROGRESS (program_name, 0);
203 expandargv (&argc, &argv);
207 bfd_set_error_program_name (program_name);
209 xatexit (remove_output);
211 /* Set up the sysroot directory. */
212 ld_sysroot = get_sysroot (argc, argv);
215 if (*TARGET_SYSTEM_ROOT == 0)
217 einfo ("%P%F: this linker was not configured to use sysroots\n");
221 ld_canon_sysroot = lrealpath (ld_sysroot);
223 if (ld_canon_sysroot)
224 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
226 ld_canon_sysroot_len = -1;
228 /* Set the default BFD target based on the configured target. Doing
229 this permits the linker to be configured for a particular target,
230 and linked against a shared BFD library which was configured for
231 a different target. The macro TARGET is defined by Makefile. */
232 if (! bfd_set_default_target (TARGET))
234 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
245 config.build_constructors = TRUE;
246 config.rpath_separator = ':';
247 config.split_by_reloc = (unsigned) -1;
248 config.split_by_file = (bfd_size_type) -1;
249 config.make_executable = TRUE;
250 config.magic_demand_paged = TRUE;
251 config.text_read_only = TRUE;
253 command_line.warn_mismatch = TRUE;
254 command_line.warn_search_mismatch = TRUE;
255 command_line.check_section_addresses = -1;
257 /* We initialize DEMANGLING based on the environment variable
258 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
259 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
260 environment. Acting the same way here lets us provide the same
261 interface by default. */
262 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
264 link_info.allow_undefined_version = TRUE;
265 link_info.keep_memory = TRUE;
266 link_info.combreloc = TRUE;
267 link_info.strip_discarded = TRUE;
268 link_info.emit_hash = TRUE;
269 link_info.callbacks = &link_callbacks;
270 link_info.input_bfds_tail = &link_info.input_bfds;
271 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
272 and _fini symbols. We are compatible. */
273 link_info.init_function = "_init";
274 link_info.fini_function = "_fini";
275 link_info.relax_pass = 1;
276 link_info.pei386_auto_import = -1;
277 link_info.spare_dynamic_tags = 5;
278 link_info.path_separator = ':';
280 ldfile_add_arch ("");
281 emulation = get_emulation (argc, argv);
282 ldemul_choose_mode (emulation);
283 default_target = ldemul_choose_target (argc, argv);
284 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
285 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
287 ldemul_before_parse ();
288 lang_has_input_file = FALSE;
289 parse_args (argc, argv);
291 if (config.hash_table_size != 0)
292 bfd_hash_set_default_size (config.hash_table_size);
294 ldemul_set_symbols ();
296 if (link_info.relocatable)
298 if (command_line.check_section_addresses < 0)
299 command_line.check_section_addresses = 0;
300 if (link_info.shared)
301 einfo (_("%P%F: -r and -shared may not be used together\n"));
304 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
305 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
306 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
307 for shared libraries. -Bsymbolic overrides all others and vice
309 switch (command_line.symbolic)
314 /* -Bsymbolic is for shared library only. */
315 if (link_info.shared)
317 link_info.symbolic = TRUE;
318 /* Should we free the unused memory? */
319 link_info.dynamic_list = NULL;
320 command_line.dynamic_list = dynamic_list_unset;
323 case symbolic_functions:
324 /* -Bsymbolic-functions is for shared library only. */
325 if (link_info.shared)
326 command_line.dynamic_list = dynamic_list_data;
330 switch (command_line.dynamic_list)
332 case dynamic_list_unset:
334 case dynamic_list_data:
335 link_info.dynamic_data = TRUE;
337 link_info.dynamic = TRUE;
341 if (! link_info.shared)
343 if (command_line.filter_shlib)
344 einfo (_("%P%F: -F may not be used without -shared\n"));
345 if (command_line.auxiliary_filters)
346 einfo (_("%P%F: -f may not be used without -shared\n"));
349 if (! link_info.shared || link_info.pie)
350 link_info.executable = TRUE;
352 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
353 don't see how else this can be handled, since in this case we
354 must preserve all externally visible symbols. */
355 if (link_info.relocatable && link_info.strip == strip_all)
357 link_info.strip = strip_debugger;
358 if (link_info.discard == discard_sec_merge)
359 link_info.discard = discard_all;
362 /* If we have not already opened and parsed a linker script,
363 try the default script from command line first. */
364 if (saved_script_handle == NULL
365 && command_line.default_script != NULL)
367 ldfile_open_command_file (command_line.default_script);
368 parser_input = input_script;
372 /* If we have not already opened and parsed a linker script
373 read the emulation's appropriate default script. */
374 if (saved_script_handle == NULL)
377 char *s = ldemul_get_script (&isfile);
380 ldfile_open_default_command_file (s);
386 parser_input = input_script;
391 if (trace_file_tries)
393 if (saved_script_handle)
394 info_msg (_("using external linker script:"));
396 info_msg (_("using internal linker script:"));
397 info_msg ("\n==================================================\n");
399 if (saved_script_handle)
401 static const int ld_bufsz = 8193;
403 char *buf = (char *) xmalloc (ld_bufsz);
405 rewind (saved_script_handle);
406 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
411 rewind (saved_script_handle);
418 info_msg (ldemul_get_script (&isfile));
421 info_msg ("\n==================================================\n");
426 if (!lang_has_input_file)
430 einfo (_("%P%F: no input files\n"));
434 info_msg (_("%P: mode %s\n"), emulation);
436 ldemul_after_parse ();
438 if (config.map_filename)
440 if (strcmp (config.map_filename, "-") == 0)
442 config.map_file = stdout;
446 config.map_file = fopen (config.map_filename, FOPEN_WT);
447 if (config.map_file == (FILE *) NULL)
449 bfd_set_error (bfd_error_system_call);
450 einfo (_("%P%F: cannot open map file %s: %E\n"),
451 config.map_filename);
458 /* Print error messages for any missing symbols, for any warning
459 symbols, and possibly multiple definitions. */
460 if (link_info.relocatable)
461 link_info.output_bfd->flags &= ~EXEC_P;
463 link_info.output_bfd->flags |= EXEC_P;
467 if (config.map_file != NULL)
469 if (command_line.cref)
470 output_cref (config.map_file != NULL ? config.map_file : stdout);
471 if (nocrossref_list != NULL)
472 check_nocrossrefs ();
476 /* Even if we're producing relocatable output, some non-fatal errors should
477 be reported in the exit status. (What non-fatal errors, if any, do we
478 want to ignore for relocatable output?) */
479 if (!config.make_executable && !force_make_executable)
482 einfo (_("%P: link errors found, deleting executable `%s'\n"),
485 /* The file will be removed by remove_output. */
490 if (! bfd_close (link_info.output_bfd))
491 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
493 /* If the --force-exe-suffix is enabled, and we're making an
494 executable file and it doesn't end in .exe, copy it to one
496 if (! link_info.relocatable && command_line.force_exe_suffix)
498 int len = strlen (output_filename);
501 || (strcasecmp (output_filename + len - 4, ".exe") != 0
502 && strcasecmp (output_filename + len - 4, ".dll") != 0))
506 const int bsize = 4096;
507 char *buf = (char *) xmalloc (bsize);
509 char *dst_name = (char *) xmalloc (len + 5);
511 strcpy (dst_name, output_filename);
512 strcat (dst_name, ".exe");
513 src = fopen (output_filename, FOPEN_RB);
514 dst = fopen (dst_name, FOPEN_WB);
517 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
520 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
522 while ((l = fread (buf, 1, bsize, src)) > 0)
524 int done = fwrite (buf, 1, l, dst);
527 einfo (_("%P: Error writing file `%s'\n"), dst_name);
531 if (fclose (dst) == EOF)
532 einfo (_("%P: Error closing file `%s'\n"), dst_name);
539 END_PROGRESS (program_name);
544 char *lim = (char *) sbrk (0);
546 long run_time = get_run_time () - start_time;
548 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
549 program_name, run_time / 1000000, run_time % 1000000);
551 fprintf (stderr, _("%s: data size %ld\n"), program_name,
552 (long) (lim - (char *) &environ));
556 /* Prevent remove_output from doing anything, after a successful link. */
557 output_filename = NULL;
563 /* If the configured sysroot is relocatable, try relocating it based on
564 default prefix FROM. Return the relocated directory if it exists,
565 otherwise return null. */
568 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
570 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
574 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
577 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
585 /* Return the sysroot directory. Return "" if no sysroot is being used. */
588 get_sysroot (int argc, char **argv)
593 for (i = 1; i < argc; i++)
594 if (CONST_STRNEQ (argv[i], "--sysroot="))
595 return argv[i] + strlen ("--sysroot=");
597 path = get_relative_sysroot (BINDIR);
601 path = get_relative_sysroot (TOOLBINDIR);
605 return TARGET_SYSTEM_ROOT;
608 /* We need to find any explicitly given emulation in order to initialize the
609 state that's needed by the lex&yacc argument parser (parse_args). */
612 get_emulation (int argc, char **argv)
617 emulation = getenv (EMULATION_ENVIRON);
618 if (emulation == NULL)
619 emulation = DEFAULT_EMULATION;
621 for (i = 1; i < argc; i++)
623 if (CONST_STRNEQ (argv[i], "-m"))
625 if (argv[i][2] == '\0')
630 emulation = argv[i + 1];
634 einfo (_("%P%F: missing argument to -m\n"));
636 else if (strcmp (argv[i], "-mips1") == 0
637 || strcmp (argv[i], "-mips2") == 0
638 || strcmp (argv[i], "-mips3") == 0
639 || strcmp (argv[i], "-mips4") == 0
640 || strcmp (argv[i], "-mips5") == 0
641 || strcmp (argv[i], "-mips32") == 0
642 || strcmp (argv[i], "-mips32r2") == 0
643 || strcmp (argv[i], "-mips64") == 0
644 || strcmp (argv[i], "-mips64r2") == 0)
646 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
647 passed to the linker by some MIPS compilers. They
648 generally tell the linker to use a slightly different
649 library path. Perhaps someday these should be
650 implemented as emulations; until then, we just ignore
651 the arguments and hope that nobody ever creates
652 emulations named ips1, ips2 or ips3. */
654 else if (strcmp (argv[i], "-m486") == 0)
656 /* FIXME: The argument -m486 is passed to the linker on
657 some Linux systems. Hope that nobody creates an
658 emulation named 486. */
663 emulation = &argv[i][2];
672 add_ysym (const char *name)
674 if (link_info.notice_hash == NULL)
676 link_info.notice_hash =
677 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
678 if (!bfd_hash_table_init_n (link_info.notice_hash,
680 sizeof (struct bfd_hash_entry),
682 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
685 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
686 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
689 /* Record a symbol to be wrapped, from the --wrap option. */
692 add_wrap (const char *name)
694 if (link_info.wrap_hash == NULL)
696 link_info.wrap_hash =
697 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
698 if (!bfd_hash_table_init_n (link_info.wrap_hash,
700 sizeof (struct bfd_hash_entry),
702 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
705 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
706 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
709 /* Handle the -retain-symbols-file option. */
712 add_keepsyms_file (const char *filename)
719 if (link_info.strip == strip_some)
720 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
722 file = fopen (filename, "r");
725 bfd_set_error (bfd_error_system_call);
726 einfo ("%X%P: %s: %E\n", filename);
730 link_info.keep_hash = (struct bfd_hash_table *)
731 xmalloc (sizeof (struct bfd_hash_table));
732 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
733 sizeof (struct bfd_hash_entry)))
734 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
737 buf = (char *) xmalloc (bufsize);
749 while (! ISSPACE (c) && c != EOF)
756 buf = (char *) xrealloc (buf, bufsize);
763 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
764 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
768 if (link_info.strip != strip_none)
769 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
772 link_info.strip = strip_some;
775 /* Callbacks from the BFD linker routines. */
777 /* This is called when BFD has decided to include an archive member in
781 add_archive_element (struct bfd_link_info *info,
785 lang_input_statement_type *input;
787 input = (lang_input_statement_type *)
788 xcalloc (1, sizeof (lang_input_statement_type));
789 input->filename = abfd->filename;
790 input->local_sym_name = abfd->filename;
791 input->the_bfd = abfd;
793 ldlang_add_file (input);
795 if (config.map_file != NULL)
797 static bfd_boolean header_printed;
798 struct bfd_link_hash_entry *h;
802 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
814 case bfd_link_hash_defined:
815 case bfd_link_hash_defweak:
816 from = h->u.def.section->owner;
819 case bfd_link_hash_undefined:
820 case bfd_link_hash_undefweak:
821 from = h->u.undef.abfd;
824 case bfd_link_hash_common:
825 from = h->u.c.p->section->owner;
830 if (! header_printed)
834 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
836 header_printed = TRUE;
839 if (bfd_my_archive (abfd) == NULL)
841 minfo ("%s", bfd_get_filename (abfd));
842 len = strlen (bfd_get_filename (abfd));
846 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
847 bfd_get_filename (abfd));
848 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
849 + strlen (bfd_get_filename (abfd))
867 minfo ("(%T)\n", h->root.string);
869 minfo ("(%s)\n", name);
872 if (trace_files || trace_file_tries)
873 info_msg ("%I\n", input);
878 /* This is called when BFD has discovered a symbol which is defined
882 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
891 /* If either section has the output_section field set to
892 bfd_abs_section_ptr, it means that the section is being
893 discarded, and this is not really a multiple definition at all.
894 FIXME: It would be cleaner to somehow ignore symbols defined in
895 sections which are being discarded. */
896 if ((osec->output_section != NULL
897 && ! bfd_is_abs_section (osec)
898 && bfd_is_abs_section (osec->output_section))
899 || (nsec->output_section != NULL
900 && ! bfd_is_abs_section (nsec)
901 && bfd_is_abs_section (nsec->output_section)))
904 einfo (_("%X%C: multiple definition of `%T'\n"),
905 nbfd, nsec, nval, name);
907 einfo (_("%D: first defined here\n"), obfd, osec, oval);
909 if (command_line.relax)
911 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
912 command_line.relax = 0;
918 /* This is called when there is a definition of a common symbol, or
919 when a common symbol is found for a symbol that is already defined,
920 or when two common symbols are found. We only do something if
921 -warn-common was used. */
924 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
927 enum bfd_link_hash_type otype,
930 enum bfd_link_hash_type ntype,
933 if (! config.warn_common)
936 if (ntype == bfd_link_hash_defined
937 || ntype == bfd_link_hash_defweak
938 || ntype == bfd_link_hash_indirect)
940 ASSERT (otype == bfd_link_hash_common);
941 einfo (_("%B: warning: definition of `%T' overriding common\n"),
944 einfo (_("%B: warning: common is here\n"), obfd);
946 else if (otype == bfd_link_hash_defined
947 || otype == bfd_link_hash_defweak
948 || otype == bfd_link_hash_indirect)
950 ASSERT (ntype == bfd_link_hash_common);
951 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
954 einfo (_("%B: warning: defined here\n"), obfd);
958 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
961 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
964 einfo (_("%B: warning: larger common is here\n"), obfd);
966 else if (nsize > osize)
968 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
971 einfo (_("%B: warning: smaller common is here\n"), obfd);
975 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
977 einfo (_("%B: warning: previous common is here\n"), obfd);
984 /* This is called when BFD has discovered a set element. H is the
985 entry in the linker hash table for the set. SECTION and VALUE
986 represent a value which should be added to the set. */
989 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
990 struct bfd_link_hash_entry *h,
991 bfd_reloc_code_real_type reloc,
996 if (config.warn_constructors)
997 einfo (_("%P: warning: global constructor %s used\n"),
1000 if (! config.build_constructors)
1003 ldctor_add_set_entry (h, reloc, NULL, section, value);
1005 if (h->type == bfd_link_hash_new)
1007 h->type = bfd_link_hash_undefined;
1008 h->u.undef.abfd = abfd;
1009 /* We don't call bfd_link_add_undef to add this to the list of
1010 undefined symbols because we are going to define it
1017 /* This is called when BFD has discovered a constructor. This is only
1018 called for some object file formats--those which do not handle
1019 constructors in some more clever fashion. This is similar to
1020 adding an element to a set, but less general. */
1023 constructor_callback (struct bfd_link_info *info,
1024 bfd_boolean constructor,
1031 struct bfd_link_hash_entry *h;
1032 char set_name[1 + sizeof "__CTOR_LIST__"];
1034 if (config.warn_constructors)
1035 einfo (_("%P: warning: global constructor %s used\n"), name);
1037 if (! config.build_constructors)
1040 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1041 useful error message. */
1042 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1043 && (info->relocatable
1044 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1045 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1048 if (bfd_get_symbol_leading_char (abfd) != '\0')
1049 *s++ = bfd_get_symbol_leading_char (abfd);
1051 strcpy (s, "__CTOR_LIST__");
1053 strcpy (s, "__DTOR_LIST__");
1055 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1056 if (h == (struct bfd_link_hash_entry *) NULL)
1057 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1058 if (h->type == bfd_link_hash_new)
1060 h->type = bfd_link_hash_undefined;
1061 h->u.undef.abfd = abfd;
1062 /* We don't call bfd_link_add_undef to add this to the list of
1063 undefined symbols because we are going to define it
1067 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1071 /* A structure used by warning_callback to pass information through
1072 bfd_map_over_sections. */
1074 struct warning_callback_info
1077 const char *warning;
1082 /* This is called when there is a reference to a warning symbol. */
1085 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1086 const char *warning,
1092 /* This is a hack to support warn_multiple_gp. FIXME: This should
1093 have a cleaner interface, but what? */
1094 if (! config.warn_multiple_gp
1095 && strcmp (warning, "using multiple gp values") == 0)
1098 if (section != NULL)
1099 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1100 else if (abfd == NULL)
1101 einfo ("%P: %s%s\n", _("warning: "), warning);
1102 else if (symbol == NULL)
1103 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1106 struct warning_callback_info info;
1108 /* Look through the relocs to see if we can find a plausible
1111 if (!bfd_generic_link_read_symbols (abfd))
1112 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1115 info.warning = warning;
1116 info.symbol = symbol;
1117 info.asymbols = bfd_get_outsymbols (abfd);
1118 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1121 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1127 /* This is called by warning_callback for each section. It checks the
1128 relocs of the section to see if it can find a reference to the
1129 symbol which triggered the warning. If it can, it uses the reloc
1130 to give an error message with a file and line number. */
1133 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1135 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1139 arelent **p, **pend;
1144 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1146 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1150 relpp = (arelent **) xmalloc (relsize);
1151 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1153 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1156 pend = p + relcount;
1157 for (; p < pend && *p != NULL; p++)
1161 if (q->sym_ptr_ptr != NULL
1162 && *q->sym_ptr_ptr != NULL
1163 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1165 /* We found a reloc for the symbol we are looking for. */
1166 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1176 /* This is called when an undefined symbol is found. */
1179 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1186 static char *error_name;
1187 static unsigned int error_count;
1189 #define MAX_ERRORS_IN_A_ROW 5
1191 if (config.warn_once)
1193 static struct bfd_hash_table *hash;
1195 /* Only warn once about a particular undefined symbol. */
1198 hash = (struct bfd_hash_table *)
1199 xmalloc (sizeof (struct bfd_hash_table));
1200 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1201 sizeof (struct bfd_hash_entry)))
1202 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1205 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1208 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1209 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1212 /* We never print more than a reasonable number of errors in a row
1213 for a single symbol. */
1214 if (error_name != NULL
1215 && strcmp (name, error_name) == 0)
1220 if (error_name != NULL)
1222 error_name = xstrdup (name);
1225 if (section != NULL)
1227 if (error_count < MAX_ERRORS_IN_A_ROW)
1230 einfo (_("%X%C: undefined reference to `%T'\n"),
1231 abfd, section, address, name);
1233 einfo (_("%C: warning: undefined reference to `%T'\n"),
1234 abfd, section, address, name);
1236 else if (error_count == MAX_ERRORS_IN_A_ROW)
1239 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1240 abfd, section, address, name);
1242 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1243 abfd, section, address, name);
1250 if (error_count < MAX_ERRORS_IN_A_ROW)
1253 einfo (_("%X%B: undefined reference to `%T'\n"),
1256 einfo (_("%B: warning: undefined reference to `%T'\n"),
1259 else if (error_count == MAX_ERRORS_IN_A_ROW)
1262 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1265 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1275 /* Counter to limit the number of relocation overflow error messages
1276 to print. Errors are printed as it is decremented. When it's
1277 called and the counter is zero, a final message is printed
1278 indicating more relocations were omitted. When it gets to -1, no
1279 such errors are printed. If it's initially set to a value less
1280 than -1, all such errors will be printed (--verbose does this). */
1282 int overflow_cutoff_limit = 10;
1284 /* This is called when a reloc overflows. */
1287 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1288 struct bfd_link_hash_entry *entry,
1290 const char *reloc_name,
1296 if (overflow_cutoff_limit == -1)
1299 einfo ("%X%C:", abfd, section, address);
1301 if (overflow_cutoff_limit >= 0
1302 && overflow_cutoff_limit-- == 0)
1304 einfo (_(" additional relocation overflows omitted from the output\n"));
1310 while (entry->type == bfd_link_hash_indirect
1311 || entry->type == bfd_link_hash_warning)
1312 entry = entry->u.i.link;
1313 switch (entry->type)
1315 case bfd_link_hash_undefined:
1316 case bfd_link_hash_undefweak:
1317 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1318 reloc_name, entry->root.string);
1320 case bfd_link_hash_defined:
1321 case bfd_link_hash_defweak:
1322 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1323 reloc_name, entry->root.string,
1324 entry->u.def.section,
1325 entry->u.def.section == bfd_abs_section_ptr
1326 ? link_info.output_bfd : entry->u.def.section->owner);
1334 einfo (_(" relocation truncated to fit: %s against `%T'"),
1337 einfo ("+%v", addend);
1342 /* This is called when a dangerous relocation is made. */
1345 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1346 const char *message,
1351 einfo (_("%X%C: dangerous relocation: %s\n"),
1352 abfd, section, address, message);
1356 /* This is called when a reloc is being generated attached to a symbol
1357 that is not being output. */
1360 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1366 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1367 abfd, section, address, name);
1371 /* This is called if link_info.notice_all is set, or when a symbol in
1372 link_info.notice_hash is found. Symbols are put in notice_hash
1373 using the -y option. */
1376 notice (struct bfd_link_info *info,
1384 if (command_line.cref || nocrossref_list != NULL)
1385 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1389 if (! info->notice_all
1390 || (info->notice_hash != NULL
1391 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1393 if (bfd_is_und_section (section))
1394 einfo ("%B: reference to %s\n", abfd, name);
1396 einfo ("%B: definition of %s\n", abfd, name);
1399 if (command_line.cref || nocrossref_list != NULL)
1400 add_cref (name, abfd, section, value);