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, 2010, 2011
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"
45 #include "plugin-api.h"
47 #endif /* ENABLE_PLUGINS */
49 /* Somewhere above, sys/stat.h got included. */
50 #if !defined(S_ISDIR) && defined(S_IFDIR)
51 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
62 #ifndef TARGET_SYSTEM_ROOT
63 #define TARGET_SYSTEM_ROOT ""
68 FILE *saved_script_handle = NULL;
69 FILE *previous_script_handle = NULL;
70 bfd_boolean force_make_executable = FALSE;
73 const char *output_filename = "a.out";
75 /* Name this program was invoked by. */
78 /* The prefix for system library directories. */
79 const char *ld_sysroot;
81 /* The canonical representation of ld_sysroot. */
82 char * ld_canon_sysroot;
83 int ld_canon_sysroot_len;
85 /* Set by -G argument, for MIPS ECOFF target. */
86 int g_switch_value = 8;
88 /* Nonzero means print names of input files as processed. */
89 bfd_boolean trace_files;
91 /* Nonzero means same, but note open failures, too. */
92 bfd_boolean trace_file_tries;
94 /* Nonzero means version number was printed, so exit successfully
95 instead of complaining if no input files are given. */
96 bfd_boolean version_printed;
98 /* Nonzero means link in every member of an archive. */
99 bfd_boolean whole_archive;
101 /* True means only create DT_NEEDED entries for dynamic libraries
102 if they actually satisfy some reference in a regular object. */
103 bfd_boolean add_DT_NEEDED_for_regular;
105 /* True means create DT_NEEDED entries for dynamic libraries that
106 are DT_NEEDED by dynamic libraries specifically mentioned on
108 bfd_boolean add_DT_NEEDED_for_dynamic = TRUE;
110 /* TRUE if we should demangle symbol names. */
111 bfd_boolean demangling;
113 args_type command_line;
115 ld_config_type config;
117 sort_type sort_section;
119 static const char *get_sysroot
121 static char *get_emulation
123 static bfd_boolean add_archive_element
124 (struct bfd_link_info *, bfd *, const char *, bfd **);
125 static bfd_boolean multiple_definition
126 (struct bfd_link_info *, struct bfd_link_hash_entry *,
127 bfd *, asection *, bfd_vma);
128 static bfd_boolean multiple_common
129 (struct bfd_link_info *, struct bfd_link_hash_entry *,
130 bfd *, enum bfd_link_hash_type, bfd_vma);
131 static bfd_boolean add_to_set
132 (struct bfd_link_info *, struct bfd_link_hash_entry *,
133 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
134 static bfd_boolean constructor_callback
135 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
136 asection *, bfd_vma);
137 static bfd_boolean warning_callback
138 (struct bfd_link_info *, const char *, const char *, bfd *,
139 asection *, bfd_vma);
140 static void warning_find_reloc
141 (bfd *, asection *, void *);
142 static bfd_boolean undefined_symbol
143 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
145 static bfd_boolean reloc_overflow
146 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
147 const char *, bfd_vma, bfd *, asection *, bfd_vma);
148 static bfd_boolean reloc_dangerous
149 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
150 static bfd_boolean unattached_reloc
151 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
152 static bfd_boolean notice
153 (struct bfd_link_info *, struct bfd_link_hash_entry *,
154 bfd *, asection *, bfd_vma, flagword, const char *);
156 static struct bfd_link_callbacks link_callbacks =
162 constructor_callback,
172 ldlang_override_segment_assignment
175 struct bfd_link_info link_info;
180 bfd_cache_close_all ();
181 #ifdef ENABLE_PLUGINS
182 plugin_call_cleanup ();
184 if (output_filename && delete_output_file_on_failure)
185 unlink_if_ordinary (output_filename);
189 main (int argc, char **argv)
192 long start_time = get_run_time ();
194 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
195 setlocale (LC_MESSAGES, "");
197 #if defined (HAVE_SETLOCALE)
198 setlocale (LC_CTYPE, "");
200 bindtextdomain (PACKAGE, LOCALEDIR);
201 textdomain (PACKAGE);
203 program_name = argv[0];
204 xmalloc_set_program_name (program_name);
206 START_PROGRESS (program_name, 0);
208 expandargv (&argc, &argv);
212 bfd_set_error_program_name (program_name);
214 xatexit (ld_cleanup);
216 /* Set up the sysroot directory. */
217 ld_sysroot = get_sysroot (argc, argv);
220 if (*TARGET_SYSTEM_ROOT == 0)
222 einfo ("%P%F: this linker was not configured to use sysroots\n");
226 ld_canon_sysroot = lrealpath (ld_sysroot);
228 if (ld_canon_sysroot)
229 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
231 ld_canon_sysroot_len = -1;
233 /* Set the default BFD target based on the configured target. Doing
234 this permits the linker to be configured for a particular target,
235 and linked against a shared BFD library which was configured for
236 a different target. The macro TARGET is defined by Makefile. */
237 if (! bfd_set_default_target (TARGET))
239 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
250 config.build_constructors = TRUE;
251 config.rpath_separator = ':';
252 config.split_by_reloc = (unsigned) -1;
253 config.split_by_file = (bfd_size_type) -1;
254 config.make_executable = TRUE;
255 config.magic_demand_paged = TRUE;
256 config.text_read_only = TRUE;
258 command_line.warn_mismatch = TRUE;
259 command_line.warn_search_mismatch = TRUE;
260 command_line.check_section_addresses = -1;
261 command_line.disable_target_specific_optimizations = -1;
263 /* We initialize DEMANGLING based on the environment variable
264 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
265 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
266 environment. Acting the same way here lets us provide the same
267 interface by default. */
268 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
270 link_info.allow_undefined_version = TRUE;
271 link_info.keep_memory = TRUE;
272 link_info.combreloc = TRUE;
273 link_info.strip_discarded = TRUE;
274 link_info.emit_hash = TRUE;
275 link_info.callbacks = &link_callbacks;
276 link_info.input_bfds_tail = &link_info.input_bfds;
277 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
278 and _fini symbols. We are compatible. */
279 link_info.init_function = "_init";
280 link_info.fini_function = "_fini";
281 link_info.relax_pass = 1;
282 link_info.pei386_auto_import = -1;
283 link_info.spare_dynamic_tags = 5;
284 link_info.path_separator = ':';
286 ldfile_add_arch ("");
287 emulation = get_emulation (argc, argv);
288 ldemul_choose_mode (emulation);
289 default_target = ldemul_choose_target (argc, argv);
290 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
291 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
293 ldemul_before_parse ();
294 lang_has_input_file = FALSE;
295 parse_args (argc, argv);
297 if (config.hash_table_size != 0)
298 bfd_hash_set_default_size (config.hash_table_size);
300 ldemul_set_symbols ();
302 if (link_info.relocatable)
304 if (command_line.check_section_addresses < 0)
305 command_line.check_section_addresses = 0;
306 if (link_info.shared)
307 einfo (_("%P%F: -r and -shared may not be used together\n"));
310 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
311 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
312 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
313 for shared libraries. -Bsymbolic overrides all others and vice
315 switch (command_line.symbolic)
320 /* -Bsymbolic is for shared library only. */
321 if (link_info.shared)
323 link_info.symbolic = TRUE;
324 /* Should we free the unused memory? */
325 link_info.dynamic_list = NULL;
326 command_line.dynamic_list = dynamic_list_unset;
329 case symbolic_functions:
330 /* -Bsymbolic-functions is for shared library only. */
331 if (link_info.shared)
332 command_line.dynamic_list = dynamic_list_data;
336 switch (command_line.dynamic_list)
338 case dynamic_list_unset:
340 case dynamic_list_data:
341 link_info.dynamic_data = TRUE;
343 link_info.dynamic = TRUE;
347 if (! link_info.shared)
349 if (command_line.filter_shlib)
350 einfo (_("%P%F: -F may not be used without -shared\n"));
351 if (command_line.auxiliary_filters)
352 einfo (_("%P%F: -f may not be used without -shared\n"));
355 if (! link_info.shared || link_info.pie)
356 link_info.executable = TRUE;
358 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
359 don't see how else this can be handled, since in this case we
360 must preserve all externally visible symbols. */
361 if (link_info.relocatable && link_info.strip == strip_all)
363 link_info.strip = strip_debugger;
364 if (link_info.discard == discard_sec_merge)
365 link_info.discard = discard_all;
368 /* If we have not already opened and parsed a linker script,
369 try the default script from command line first. */
370 if (saved_script_handle == NULL
371 && command_line.default_script != NULL)
373 ldfile_open_command_file (command_line.default_script);
374 parser_input = input_script;
378 /* If we have not already opened and parsed a linker script
379 read the emulation's appropriate default script. */
380 if (saved_script_handle == NULL)
383 char *s = ldemul_get_script (&isfile);
386 ldfile_open_default_command_file (s);
392 parser_input = input_script;
397 if (trace_file_tries)
399 if (saved_script_handle)
400 info_msg (_("using external linker script:"));
402 info_msg (_("using internal linker script:"));
403 info_msg ("\n==================================================\n");
405 if (saved_script_handle)
407 static const int ld_bufsz = 8193;
409 char *buf = (char *) xmalloc (ld_bufsz);
411 rewind (saved_script_handle);
412 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
417 rewind (saved_script_handle);
424 info_msg (ldemul_get_script (&isfile));
427 info_msg ("\n==================================================\n");
430 if (command_line.print_output_format)
431 info_msg ("%s\n", lang_get_output_target ());
435 if (!lang_has_input_file)
437 if (version_printed || command_line.print_output_format)
439 einfo (_("%P%F: no input files\n"));
443 info_msg (_("%P: mode %s\n"), emulation);
445 ldemul_after_parse ();
447 if (config.map_filename)
449 if (strcmp (config.map_filename, "-") == 0)
451 config.map_file = stdout;
455 config.map_file = fopen (config.map_filename, FOPEN_WT);
456 if (config.map_file == (FILE *) NULL)
458 bfd_set_error (bfd_error_system_call);
459 einfo (_("%P%F: cannot open map file %s: %E\n"),
460 config.map_filename);
467 /* Print error messages for any missing symbols, for any warning
468 symbols, and possibly multiple definitions. */
469 if (link_info.relocatable)
470 link_info.output_bfd->flags &= ~EXEC_P;
472 link_info.output_bfd->flags |= EXEC_P;
476 if (config.map_file != NULL)
478 if (command_line.cref)
479 output_cref (config.map_file != NULL ? config.map_file : stdout);
480 if (nocrossref_list != NULL)
481 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 (link_info.output_bfd))
500 einfo (_("%F%B: final close failed: %E\n"), link_info.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 = (char *) xmalloc (bsize);
518 char *dst_name = (char *) 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 = (char *) sbrk (0);
555 long run_time = get_run_time () - start_time;
558 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
559 program_name, run_time / 1000000, run_time % 1000000);
561 fprintf (stderr, _("%s: data size %ld\n"), program_name,
562 (long) (lim - (char *) &environ));
567 /* Prevent remove_output from doing anything, after a successful link. */
568 output_filename = NULL;
574 /* If the configured sysroot is relocatable, try relocating it based on
575 default prefix FROM. Return the relocated directory if it exists,
576 otherwise return null. */
579 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
581 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
585 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
588 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
596 /* Return the sysroot directory. Return "" if no sysroot is being used. */
599 get_sysroot (int argc, char **argv)
604 for (i = 1; i < argc; i++)
605 if (CONST_STRNEQ (argv[i], "--sysroot="))
606 return argv[i] + strlen ("--sysroot=");
608 path = get_relative_sysroot (BINDIR);
612 path = get_relative_sysroot (TOOLBINDIR);
616 return TARGET_SYSTEM_ROOT;
619 /* We need to find any explicitly given emulation in order to initialize the
620 state that's needed by the lex&yacc argument parser (parse_args). */
623 get_emulation (int argc, char **argv)
628 emulation = getenv (EMULATION_ENVIRON);
629 if (emulation == NULL)
630 emulation = DEFAULT_EMULATION;
632 for (i = 1; i < argc; i++)
634 if (CONST_STRNEQ (argv[i], "-m"))
636 if (argv[i][2] == '\0')
641 emulation = argv[i + 1];
645 einfo (_("%P%F: missing argument to -m\n"));
647 else if (strcmp (argv[i], "-mips1") == 0
648 || strcmp (argv[i], "-mips2") == 0
649 || strcmp (argv[i], "-mips3") == 0
650 || strcmp (argv[i], "-mips4") == 0
651 || strcmp (argv[i], "-mips5") == 0
652 || strcmp (argv[i], "-mips32") == 0
653 || strcmp (argv[i], "-mips32r2") == 0
654 || strcmp (argv[i], "-mips64") == 0
655 || strcmp (argv[i], "-mips64r2") == 0)
657 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
658 passed to the linker by some MIPS compilers. They
659 generally tell the linker to use a slightly different
660 library path. Perhaps someday these should be
661 implemented as emulations; until then, we just ignore
662 the arguments and hope that nobody ever creates
663 emulations named ips1, ips2 or ips3. */
665 else if (strcmp (argv[i], "-m486") == 0)
667 /* FIXME: The argument -m486 is passed to the linker on
668 some Linux systems. Hope that nobody creates an
669 emulation named 486. */
674 emulation = &argv[i][2];
683 add_ysym (const char *name)
685 if (link_info.notice_hash == NULL)
687 link_info.notice_hash =
688 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
689 if (!bfd_hash_table_init_n (link_info.notice_hash,
691 sizeof (struct bfd_hash_entry),
693 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
696 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
697 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
700 /* Record a symbol to be wrapped, from the --wrap option. */
703 add_wrap (const char *name)
705 if (link_info.wrap_hash == NULL)
707 link_info.wrap_hash =
708 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
709 if (!bfd_hash_table_init_n (link_info.wrap_hash,
711 sizeof (struct bfd_hash_entry),
713 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
716 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
717 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
720 /* Handle the -retain-symbols-file option. */
723 add_keepsyms_file (const char *filename)
730 if (link_info.strip == strip_some)
731 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
733 file = fopen (filename, "r");
736 bfd_set_error (bfd_error_system_call);
737 einfo ("%X%P: %s: %E\n", filename);
741 link_info.keep_hash = (struct bfd_hash_table *)
742 xmalloc (sizeof (struct bfd_hash_table));
743 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
744 sizeof (struct bfd_hash_entry)))
745 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
748 buf = (char *) xmalloc (bufsize);
760 while (! ISSPACE (c) && c != EOF)
767 buf = (char *) xrealloc (buf, bufsize);
774 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
775 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
779 if (link_info.strip != strip_none)
780 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
783 link_info.strip = strip_some;
786 /* Callbacks from the BFD linker routines. */
788 /* This is called when BFD has decided to include an archive member in
792 add_archive_element (struct bfd_link_info *info,
795 bfd **subsbfd ATTRIBUTE_UNUSED)
797 lang_input_statement_type *input;
798 lang_input_statement_type orig_input;
800 input = (lang_input_statement_type *)
801 xcalloc (1, sizeof (lang_input_statement_type));
802 input->filename = abfd->filename;
803 input->local_sym_name = abfd->filename;
804 input->the_bfd = abfd;
806 /* Save the original data for trace files/tries below, as plugins
807 (if enabled) may possibly alter it to point to a replacement
808 BFD, but we still want to output the original BFD filename. */
810 #ifdef ENABLE_PLUGINS
811 if (bfd_my_archive (abfd) != NULL
812 && plugin_active_plugins_p ()
813 && !no_more_claiming)
815 /* We must offer this archive member to the plugins to claim. */
816 int fd = open (bfd_my_archive (abfd)->filename, O_RDONLY | O_BINARY);
819 struct ld_plugin_input_file file;
821 /* Offset and filesize must refer to the individual archive
822 member, not the whole file, and must exclude the header.
823 Fortunately for us, that is how the data is stored in the
824 origin field of the bfd and in the arelt_data. */
825 file.name = bfd_my_archive (abfd)->filename;
826 file.offset = abfd->origin;
827 file.filesize = arelt_size (abfd);
829 plugin_maybe_claim (&file, input);
832 input->claim_archive = TRUE;
833 *subsbfd = input->the_bfd;
837 #endif /* ENABLE_PLUGINS */
839 ldlang_add_file (input);
841 if (config.map_file != NULL)
843 static bfd_boolean header_printed;
844 struct bfd_link_hash_entry *h;
848 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
860 case bfd_link_hash_defined:
861 case bfd_link_hash_defweak:
862 from = h->u.def.section->owner;
865 case bfd_link_hash_undefined:
866 case bfd_link_hash_undefweak:
867 from = h->u.undef.abfd;
870 case bfd_link_hash_common:
871 from = h->u.c.p->section->owner;
876 if (! header_printed)
880 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
882 header_printed = TRUE;
885 if (bfd_my_archive (abfd) == NULL)
887 minfo ("%s", bfd_get_filename (abfd));
888 len = strlen (bfd_get_filename (abfd));
892 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
893 bfd_get_filename (abfd));
894 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
895 + strlen (bfd_get_filename (abfd))
913 minfo ("(%T)\n", h->root.string);
915 minfo ("(%s)\n", name);
918 if (trace_files || trace_file_tries)
919 info_msg ("%I\n", &orig_input);
923 /* This is called when BFD has discovered a symbol which is defined
927 multiple_definition (struct bfd_link_info *info,
928 struct bfd_link_hash_entry *h,
938 if (info->allow_multiple_definition)
943 case bfd_link_hash_defined:
944 osec = h->u.def.section;
945 oval = h->u.def.value;
946 obfd = h->u.def.section->owner;
948 case bfd_link_hash_indirect:
949 osec = bfd_ind_section_ptr;
957 /* Ignore a redefinition of an absolute symbol to the
958 same value; it's harmless. */
959 if (h->type == bfd_link_hash_defined
960 && bfd_is_abs_section (osec)
961 && bfd_is_abs_section (nsec)
965 /* If either section has the output_section field set to
966 bfd_abs_section_ptr, it means that the section is being
967 discarded, and this is not really a multiple definition at all.
968 FIXME: It would be cleaner to somehow ignore symbols defined in
969 sections which are being discarded. */
970 if ((osec->output_section != NULL
971 && ! bfd_is_abs_section (osec)
972 && bfd_is_abs_section (osec->output_section))
973 || (nsec->output_section != NULL
974 && ! bfd_is_abs_section (nsec)
975 && bfd_is_abs_section (nsec->output_section)))
978 name = h->root.string;
986 einfo (_("%X%C: multiple definition of `%T'\n"),
987 nbfd, nsec, nval, name);
989 einfo (_("%D: first defined here\n"), obfd, osec, oval);
991 if (RELAXATION_ENABLED)
993 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
994 command_line.disable_target_specific_optimizations = -1;
1000 /* This is called when there is a definition of a common symbol, or
1001 when a common symbol is found for a symbol that is already defined,
1002 or when two common symbols are found. We only do something if
1003 -warn-common was used. */
1006 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1007 struct bfd_link_hash_entry *h,
1009 enum bfd_link_hash_type ntype,
1014 enum bfd_link_hash_type otype;
1017 if (!config.warn_common)
1020 name = h->root.string;
1022 if (otype == bfd_link_hash_common)
1024 obfd = h->u.c.p->section->owner;
1025 osize = h->u.c.size;
1027 else if (otype == bfd_link_hash_defined
1028 || otype == bfd_link_hash_defweak)
1030 obfd = h->u.def.section->owner;
1035 /* FIXME: It would nice if we could report the BFD which defined
1036 an indirect symbol, but we don't have anywhere to store the
1042 if (ntype == bfd_link_hash_defined
1043 || ntype == bfd_link_hash_defweak
1044 || ntype == bfd_link_hash_indirect)
1046 ASSERT (otype == bfd_link_hash_common);
1047 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1050 einfo (_("%B: warning: common is here\n"), obfd);
1052 else if (otype == bfd_link_hash_defined
1053 || otype == bfd_link_hash_defweak
1054 || otype == bfd_link_hash_indirect)
1056 ASSERT (ntype == bfd_link_hash_common);
1057 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1060 einfo (_("%B: warning: defined here\n"), obfd);
1064 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1067 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1070 einfo (_("%B: warning: larger common is here\n"), obfd);
1072 else if (nsize > osize)
1074 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1077 einfo (_("%B: warning: smaller common is here\n"), obfd);
1081 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1083 einfo (_("%B: warning: previous common is here\n"), obfd);
1090 /* This is called when BFD has discovered a set element. H is the
1091 entry in the linker hash table for the set. SECTION and VALUE
1092 represent a value which should be added to the set. */
1095 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1096 struct bfd_link_hash_entry *h,
1097 bfd_reloc_code_real_type reloc,
1102 if (config.warn_constructors)
1103 einfo (_("%P: warning: global constructor %s used\n"),
1106 if (! config.build_constructors)
1109 ldctor_add_set_entry (h, reloc, NULL, section, value);
1111 if (h->type == bfd_link_hash_new)
1113 h->type = bfd_link_hash_undefined;
1114 h->u.undef.abfd = abfd;
1115 /* We don't call bfd_link_add_undef to add this to the list of
1116 undefined symbols because we are going to define it
1123 /* This is called when BFD has discovered a constructor. This is only
1124 called for some object file formats--those which do not handle
1125 constructors in some more clever fashion. This is similar to
1126 adding an element to a set, but less general. */
1129 constructor_callback (struct bfd_link_info *info,
1130 bfd_boolean constructor,
1137 struct bfd_link_hash_entry *h;
1138 char set_name[1 + sizeof "__CTOR_LIST__"];
1140 if (config.warn_constructors)
1141 einfo (_("%P: warning: global constructor %s used\n"), name);
1143 if (! config.build_constructors)
1146 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1147 useful error message. */
1148 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1149 && (info->relocatable
1150 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1151 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1154 if (bfd_get_symbol_leading_char (abfd) != '\0')
1155 *s++ = bfd_get_symbol_leading_char (abfd);
1157 strcpy (s, "__CTOR_LIST__");
1159 strcpy (s, "__DTOR_LIST__");
1161 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1162 if (h == (struct bfd_link_hash_entry *) NULL)
1163 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1164 if (h->type == bfd_link_hash_new)
1166 h->type = bfd_link_hash_undefined;
1167 h->u.undef.abfd = abfd;
1168 /* We don't call bfd_link_add_undef to add this to the list of
1169 undefined symbols because we are going to define it
1173 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1177 /* A structure used by warning_callback to pass information through
1178 bfd_map_over_sections. */
1180 struct warning_callback_info
1183 const char *warning;
1188 /* This is called when there is a reference to a warning symbol. */
1191 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1192 const char *warning,
1198 /* This is a hack to support warn_multiple_gp. FIXME: This should
1199 have a cleaner interface, but what? */
1200 if (! config.warn_multiple_gp
1201 && strcmp (warning, "using multiple gp values") == 0)
1204 if (section != NULL)
1205 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1206 else if (abfd == NULL)
1207 einfo ("%P: %s%s\n", _("warning: "), warning);
1208 else if (symbol == NULL)
1209 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1212 struct warning_callback_info cinfo;
1214 /* Look through the relocs to see if we can find a plausible
1217 if (!bfd_generic_link_read_symbols (abfd))
1218 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1220 cinfo.found = FALSE;
1221 cinfo.warning = warning;
1222 cinfo.symbol = symbol;
1223 cinfo.asymbols = bfd_get_outsymbols (abfd);
1224 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1227 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1233 /* This is called by warning_callback for each section. It checks the
1234 relocs of the section to see if it can find a reference to the
1235 symbol which triggered the warning. If it can, it uses the reloc
1236 to give an error message with a file and line number. */
1239 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1241 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1245 arelent **p, **pend;
1250 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1252 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1256 relpp = (arelent **) xmalloc (relsize);
1257 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1259 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1262 pend = p + relcount;
1263 for (; p < pend && *p != NULL; p++)
1267 if (q->sym_ptr_ptr != NULL
1268 && *q->sym_ptr_ptr != NULL
1269 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1271 /* We found a reloc for the symbol we are looking for. */
1272 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1282 /* This is called when an undefined symbol is found. */
1285 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1292 static char *error_name;
1293 static unsigned int error_count;
1295 #define MAX_ERRORS_IN_A_ROW 5
1297 if (config.warn_once)
1299 static struct bfd_hash_table *hash;
1301 /* Only warn once about a particular undefined symbol. */
1304 hash = (struct bfd_hash_table *)
1305 xmalloc (sizeof (struct bfd_hash_table));
1306 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1307 sizeof (struct bfd_hash_entry)))
1308 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1311 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1314 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1315 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1318 /* We never print more than a reasonable number of errors in a row
1319 for a single symbol. */
1320 if (error_name != NULL
1321 && strcmp (name, error_name) == 0)
1326 if (error_name != NULL)
1328 error_name = xstrdup (name);
1331 if (section != NULL)
1333 if (error_count < MAX_ERRORS_IN_A_ROW)
1336 einfo (_("%X%C: undefined reference to `%T'\n"),
1337 abfd, section, address, name);
1339 einfo (_("%C: warning: undefined reference to `%T'\n"),
1340 abfd, section, address, name);
1342 else if (error_count == MAX_ERRORS_IN_A_ROW)
1345 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1346 abfd, section, address, name);
1348 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1349 abfd, section, address, name);
1356 if (error_count < MAX_ERRORS_IN_A_ROW)
1359 einfo (_("%X%B: undefined reference to `%T'\n"),
1362 einfo (_("%B: warning: undefined reference to `%T'\n"),
1365 else if (error_count == MAX_ERRORS_IN_A_ROW)
1368 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1371 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1381 /* Counter to limit the number of relocation overflow error messages
1382 to print. Errors are printed as it is decremented. When it's
1383 called and the counter is zero, a final message is printed
1384 indicating more relocations were omitted. When it gets to -1, no
1385 such errors are printed. If it's initially set to a value less
1386 than -1, all such errors will be printed (--verbose does this). */
1388 int overflow_cutoff_limit = 10;
1390 /* This is called when a reloc overflows. */
1393 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1394 struct bfd_link_hash_entry *entry,
1396 const char *reloc_name,
1402 if (overflow_cutoff_limit == -1)
1405 einfo ("%X%H:", abfd, section, address);
1407 if (overflow_cutoff_limit >= 0
1408 && overflow_cutoff_limit-- == 0)
1410 einfo (_(" additional relocation overflows omitted from the output\n"));
1416 while (entry->type == bfd_link_hash_indirect
1417 || entry->type == bfd_link_hash_warning)
1418 entry = entry->u.i.link;
1419 switch (entry->type)
1421 case bfd_link_hash_undefined:
1422 case bfd_link_hash_undefweak:
1423 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1424 reloc_name, entry->root.string);
1426 case bfd_link_hash_defined:
1427 case bfd_link_hash_defweak:
1428 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1429 reloc_name, entry->root.string,
1430 entry->u.def.section,
1431 entry->u.def.section == bfd_abs_section_ptr
1432 ? link_info.output_bfd : entry->u.def.section->owner);
1440 einfo (_(" relocation truncated to fit: %s against `%T'"),
1443 einfo ("+%v", addend);
1448 /* This is called when a dangerous relocation is made. */
1451 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1452 const char *message,
1457 einfo (_("%X%H: dangerous relocation: %s\n"),
1458 abfd, section, address, message);
1462 /* This is called when a reloc is being generated attached to a symbol
1463 that is not being output. */
1466 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1472 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1473 abfd, section, address, name);
1477 /* This is called if link_info.notice_all is set, or when a symbol in
1478 link_info.notice_hash is found. Symbols are put in notice_hash
1479 using the -y option, while notice_all is set if the --cref option
1480 has been supplied, or if there are any NOCROSSREFS sections in the
1481 linker script; and if plugins are active, since they need to monitor
1482 all references from non-IR files. */
1485 notice (struct bfd_link_info *info,
1486 struct bfd_link_hash_entry *h,
1490 flagword flags ATTRIBUTE_UNUSED,
1491 const char *string ATTRIBUTE_UNUSED)
1497 if (command_line.cref || nocrossref_list != NULL)
1498 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1502 name = h->root.string;
1503 if (info->notice_hash != NULL
1504 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1506 if (bfd_is_und_section (section))
1507 einfo ("%B: reference to %s\n", abfd, name);
1509 einfo ("%B: definition of %s\n", abfd, name);
1512 if (command_line.cref || nocrossref_list != NULL)
1513 add_cref (name, abfd, section, value);