1 /* Main program of GNU linker.
2 Copyright (C) 1991-2014 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
5 This file is part of the GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "safe-ctype.h"
25 #include "libiberty.h"
28 #include "filenames.h"
43 #include "plugin-api.h"
45 #endif /* ENABLE_PLUGINS */
47 /* Somewhere above, sys/stat.h got included. */
48 #if !defined(S_ISDIR) && defined(S_IFDIR)
49 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
60 #ifndef TARGET_SYSTEM_ROOT
61 #define TARGET_SYSTEM_ROOT ""
66 FILE *saved_script_handle = NULL;
67 FILE *previous_script_handle = NULL;
68 bfd_boolean force_make_executable = FALSE;
71 const char *output_filename = "a.out";
73 /* Name this program was invoked by. */
76 /* The prefix for system library directories. */
77 const char *ld_sysroot;
79 /* The canonical representation of ld_sysroot. */
80 char * ld_canon_sysroot;
81 int ld_canon_sysroot_len;
83 /* Set by -G argument, for targets like MIPS ELF. */
84 int g_switch_value = 8;
86 /* Nonzero means print names of input files as processed. */
87 bfd_boolean trace_files;
89 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
92 /* Nonzero means version number was printed, so exit successfully
93 instead of complaining if no input files are given. */
94 bfd_boolean version_printed;
96 /* TRUE if we should demangle symbol names. */
97 bfd_boolean demangling;
99 args_type command_line;
101 ld_config_type config;
103 sort_type sort_section;
105 static const char *get_sysroot
107 static char *get_emulation
109 static bfd_boolean add_archive_element
110 (struct bfd_link_info *, bfd *, const char *, bfd **);
111 static bfd_boolean multiple_definition
112 (struct bfd_link_info *, struct bfd_link_hash_entry *,
113 bfd *, asection *, bfd_vma);
114 static bfd_boolean multiple_common
115 (struct bfd_link_info *, struct bfd_link_hash_entry *,
116 bfd *, enum bfd_link_hash_type, bfd_vma);
117 static bfd_boolean add_to_set
118 (struct bfd_link_info *, struct bfd_link_hash_entry *,
119 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
120 static bfd_boolean constructor_callback
121 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
122 asection *, bfd_vma);
123 static bfd_boolean warning_callback
124 (struct bfd_link_info *, const char *, const char *, bfd *,
125 asection *, bfd_vma);
126 static void warning_find_reloc
127 (bfd *, asection *, void *);
128 static bfd_boolean undefined_symbol
129 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
131 static bfd_boolean reloc_overflow
132 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
133 const char *, bfd_vma, bfd *, asection *, bfd_vma);
134 static bfd_boolean reloc_dangerous
135 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
136 static bfd_boolean unattached_reloc
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
138 static bfd_boolean notice
139 (struct bfd_link_info *, struct bfd_link_hash_entry *,
140 bfd *, asection *, bfd_vma, flagword, const char *);
142 static struct bfd_link_callbacks link_callbacks =
148 constructor_callback,
158 ldlang_override_segment_assignment
161 static bfd_assert_handler_type default_bfd_assert_handler;
163 struct bfd_link_info link_info;
168 bfd_cache_close_all ();
169 #ifdef ENABLE_PLUGINS
170 plugin_call_cleanup ();
172 if (output_filename && delete_output_file_on_failure)
173 unlink_if_ordinary (output_filename);
176 /* If there's a BFD assertion, we'll notice and exit with an error
177 unless otherwise instructed. */
180 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
181 const char *file, int line)
183 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
184 config.make_executable = FALSE;
188 main (int argc, char **argv)
191 long start_time = get_run_time ();
193 char *start_sbrk = (char *) sbrk (0);
196 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
197 setlocale (LC_MESSAGES, "");
199 #if defined (HAVE_SETLOCALE)
200 setlocale (LC_CTYPE, "");
202 bindtextdomain (PACKAGE, LOCALEDIR);
203 textdomain (PACKAGE);
205 program_name = argv[0];
206 xmalloc_set_program_name (program_name);
208 START_PROGRESS (program_name, 0);
210 expandargv (&argc, &argv);
214 bfd_set_error_program_name (program_name);
216 /* We want to notice and fail on those nasty BFD assertions which are
217 likely to signal incorrect output being generated but otherwise may
219 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
221 xatexit (ld_cleanup);
223 /* Set up the sysroot directory. */
224 ld_sysroot = get_sysroot (argc, argv);
227 if (*TARGET_SYSTEM_ROOT == 0)
229 einfo ("%P%F: this linker was not configured to use sysroots\n");
233 ld_canon_sysroot = lrealpath (ld_sysroot);
235 if (ld_canon_sysroot)
236 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
238 ld_canon_sysroot_len = -1;
240 /* Set the default BFD target based on the configured target. Doing
241 this permits the linker to be configured for a particular target,
242 and linked against a shared BFD library which was configured for
243 a different target. The macro TARGET is defined by Makefile. */
244 if (! bfd_set_default_target (TARGET))
246 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
257 config.build_constructors = TRUE;
258 config.rpath_separator = ':';
259 config.split_by_reloc = (unsigned) -1;
260 config.split_by_file = (bfd_size_type) -1;
261 config.make_executable = TRUE;
262 config.magic_demand_paged = TRUE;
263 config.text_read_only = TRUE;
264 link_info.disable_target_specific_optimizations = -1;
266 command_line.warn_mismatch = TRUE;
267 command_line.warn_search_mismatch = TRUE;
268 command_line.check_section_addresses = -1;
270 /* We initialize DEMANGLING based on the environment variable
271 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
272 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
273 environment. Acting the same way here lets us provide the same
274 interface by default. */
275 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
277 link_info.allow_undefined_version = TRUE;
278 link_info.keep_memory = TRUE;
279 link_info.combreloc = TRUE;
280 link_info.strip_discarded = TRUE;
281 link_info.emit_hash = TRUE;
282 link_info.callbacks = &link_callbacks;
283 link_info.input_bfds_tail = &link_info.input_bfds;
284 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
285 and _fini symbols. We are compatible. */
286 link_info.init_function = "_init";
287 link_info.fini_function = "_fini";
288 link_info.relax_pass = 1;
289 link_info.pei386_auto_import = -1;
290 link_info.spare_dynamic_tags = 5;
291 link_info.path_separator = ':';
293 ldfile_add_arch ("");
294 emulation = get_emulation (argc, argv);
295 ldemul_choose_mode (emulation);
296 default_target = ldemul_choose_target (argc, argv);
297 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
298 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
300 ldemul_before_parse ();
301 lang_has_input_file = FALSE;
302 parse_args (argc, argv);
304 if (config.hash_table_size != 0)
305 bfd_hash_set_default_size (config.hash_table_size);
307 #ifdef ENABLE_PLUGINS
308 /* Now all the plugin arguments have been gathered, we can load them. */
309 plugin_load_plugins ();
310 #endif /* ENABLE_PLUGINS */
312 ldemul_set_symbols ();
314 /* If we have not already opened and parsed a linker script,
315 try the default script from command line first. */
316 if (saved_script_handle == NULL
317 && command_line.default_script != NULL)
319 ldfile_open_command_file (command_line.default_script);
320 parser_input = input_script;
324 /* If we have not already opened and parsed a linker script
325 read the emulation's appropriate default script. */
326 if (saved_script_handle == NULL)
329 char *s = ldemul_get_script (&isfile);
332 ldfile_open_default_command_file (s);
336 lex_redirect (s, _("built in linker script"), 1);
338 parser_input = input_script;
345 if (saved_script_handle)
346 info_msg (_("using external linker script:"));
348 info_msg (_("using internal linker script:"));
349 info_msg ("\n==================================================\n");
351 if (saved_script_handle)
353 static const int ld_bufsz = 8193;
355 char *buf = (char *) xmalloc (ld_bufsz);
357 rewind (saved_script_handle);
358 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
363 rewind (saved_script_handle);
370 info_msg (ldemul_get_script (&isfile));
373 info_msg ("\n==================================================\n");
376 if (command_line.print_output_format)
377 info_msg ("%s\n", lang_get_output_target ());
381 /* If the only command line argument has been -v or --version or --verbose
382 then ignore any input files provided by linker scripts and exit now.
383 We do not want to create an output file when the linker is just invoked
384 to provide version information. */
385 if (argc == 2 && version_printed)
388 if (!lang_has_input_file)
390 if (version_printed || command_line.print_output_format)
392 einfo (_("%P%F: no input files\n"));
396 info_msg (_("%P: mode %s\n"), emulation);
398 ldemul_after_parse ();
400 if (config.map_filename)
402 if (strcmp (config.map_filename, "-") == 0)
404 config.map_file = stdout;
408 config.map_file = fopen (config.map_filename, FOPEN_WT);
409 if (config.map_file == (FILE *) NULL)
411 bfd_set_error (bfd_error_system_call);
412 einfo (_("%P%F: cannot open map file %s: %E\n"),
413 config.map_filename);
420 /* Print error messages for any missing symbols, for any warning
421 symbols, and possibly multiple definitions. */
422 if (link_info.relocatable)
423 link_info.output_bfd->flags &= ~EXEC_P;
425 link_info.output_bfd->flags |= EXEC_P;
429 if (config.map_file != NULL)
431 if (command_line.cref)
432 output_cref (config.map_file != NULL ? config.map_file : stdout);
433 if (nocrossref_list != NULL)
434 check_nocrossrefs ();
437 struct bfd_link_hash_entry * h;
439 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
440 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
445 /* Even if we're producing relocatable output, some non-fatal errors should
446 be reported in the exit status. (What non-fatal errors, if any, do we
447 want to ignore for relocatable output?) */
448 if (!config.make_executable && !force_make_executable)
451 einfo (_("%P: link errors found, deleting executable `%s'\n"),
454 /* The file will be removed by ld_cleanup. */
459 if (! bfd_close (link_info.output_bfd))
460 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
462 /* If the --force-exe-suffix is enabled, and we're making an
463 executable file and it doesn't end in .exe, copy it to one
465 if (! link_info.relocatable && command_line.force_exe_suffix)
467 int len = strlen (output_filename);
470 || (strcasecmp (output_filename + len - 4, ".exe") != 0
471 && strcasecmp (output_filename + len - 4, ".dll") != 0))
475 const int bsize = 4096;
476 char *buf = (char *) xmalloc (bsize);
478 char *dst_name = (char *) xmalloc (len + 5);
480 strcpy (dst_name, output_filename);
481 strcat (dst_name, ".exe");
482 src = fopen (output_filename, FOPEN_RB);
483 dst = fopen (dst_name, FOPEN_WB);
486 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
489 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
491 while ((l = fread (buf, 1, bsize, src)) > 0)
493 int done = fwrite (buf, 1, l, dst);
496 einfo (_("%P: Error writing file `%s'\n"), dst_name);
500 if (fclose (dst) == EOF)
501 einfo (_("%P: Error closing file `%s'\n"), dst_name);
508 END_PROGRESS (program_name);
513 char *lim = (char *) sbrk (0);
515 long run_time = get_run_time () - start_time;
518 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
519 program_name, run_time / 1000000, run_time % 1000000);
521 fprintf (stderr, _("%s: data size %ld\n"), program_name,
522 (long) (lim - start_sbrk));
527 /* Prevent ld_cleanup from doing anything, after a successful link. */
528 output_filename = NULL;
534 /* If the configured sysroot is relocatable, try relocating it based on
535 default prefix FROM. Return the relocated directory if it exists,
536 otherwise return null. */
539 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
541 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
545 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
548 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
556 /* Return the sysroot directory. Return "" if no sysroot is being used. */
559 get_sysroot (int argc, char **argv)
564 for (i = 1; i < argc; i++)
565 if (CONST_STRNEQ (argv[i], "--sysroot="))
566 return argv[i] + strlen ("--sysroot=");
568 path = get_relative_sysroot (BINDIR);
572 path = get_relative_sysroot (TOOLBINDIR);
576 return TARGET_SYSTEM_ROOT;
579 /* We need to find any explicitly given emulation in order to initialize the
580 state that's needed by the lex&yacc argument parser (parse_args). */
583 get_emulation (int argc, char **argv)
588 emulation = getenv (EMULATION_ENVIRON);
589 if (emulation == NULL)
590 emulation = DEFAULT_EMULATION;
592 for (i = 1; i < argc; i++)
594 if (CONST_STRNEQ (argv[i], "-m"))
596 if (argv[i][2] == '\0')
601 emulation = argv[i + 1];
605 einfo (_("%P%F: missing argument to -m\n"));
607 else if (strcmp (argv[i], "-mips1") == 0
608 || strcmp (argv[i], "-mips2") == 0
609 || strcmp (argv[i], "-mips3") == 0
610 || strcmp (argv[i], "-mips4") == 0
611 || strcmp (argv[i], "-mips5") == 0
612 || strcmp (argv[i], "-mips32") == 0
613 || strcmp (argv[i], "-mips32r2") == 0
614 || strcmp (argv[i], "-mips64") == 0
615 || strcmp (argv[i], "-mips64r2") == 0)
617 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
618 passed to the linker by some MIPS compilers. They
619 generally tell the linker to use a slightly different
620 library path. Perhaps someday these should be
621 implemented as emulations; until then, we just ignore
622 the arguments and hope that nobody ever creates
623 emulations named ips1, ips2 or ips3. */
625 else if (strcmp (argv[i], "-m486") == 0)
627 /* FIXME: The argument -m486 is passed to the linker on
628 some Linux systems. Hope that nobody creates an
629 emulation named 486. */
634 emulation = &argv[i][2];
643 add_ysym (const char *name)
645 if (link_info.notice_hash == NULL)
647 link_info.notice_hash =
648 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
649 if (!bfd_hash_table_init_n (link_info.notice_hash,
651 sizeof (struct bfd_hash_entry),
653 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
656 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
657 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
661 add_ignoresym (struct bfd_link_info *info, const char *name)
663 if (info->ignore_hash == NULL)
665 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
666 if (! bfd_hash_table_init_n (info->ignore_hash,
668 sizeof (struct bfd_hash_entry),
670 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
673 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
674 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
677 /* Record a symbol to be wrapped, from the --wrap option. */
680 add_wrap (const char *name)
682 if (link_info.wrap_hash == NULL)
684 link_info.wrap_hash =
685 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
686 if (!bfd_hash_table_init_n (link_info.wrap_hash,
688 sizeof (struct bfd_hash_entry),
690 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
693 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
694 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
697 /* Handle the -retain-symbols-file option. */
700 add_keepsyms_file (const char *filename)
707 if (link_info.strip == strip_some)
708 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
710 file = fopen (filename, "r");
713 bfd_set_error (bfd_error_system_call);
714 einfo ("%X%P: %s: %E\n", filename);
718 link_info.keep_hash = (struct bfd_hash_table *)
719 xmalloc (sizeof (struct bfd_hash_table));
720 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
721 sizeof (struct bfd_hash_entry)))
722 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
725 buf = (char *) xmalloc (bufsize);
737 while (! ISSPACE (c) && c != EOF)
744 buf = (char *) xrealloc (buf, bufsize);
751 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
752 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
756 if (link_info.strip != strip_none)
757 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
760 link_info.strip = strip_some;
764 /* Callbacks from the BFD linker routines. */
766 /* This is called when BFD has decided to include an archive member in
770 add_archive_element (struct bfd_link_info *info,
773 bfd **subsbfd ATTRIBUTE_UNUSED)
775 lang_input_statement_type *input;
776 lang_input_statement_type orig_input;
778 input = (lang_input_statement_type *)
779 xcalloc (1, sizeof (lang_input_statement_type));
780 input->filename = abfd->filename;
781 input->local_sym_name = abfd->filename;
782 input->the_bfd = abfd;
784 /* Save the original data for trace files/tries below, as plugins
785 (if enabled) may possibly alter it to point to a replacement
786 BFD, but we still want to output the original BFD filename. */
788 #ifdef ENABLE_PLUGINS
789 if (plugin_active_plugins_p () && !no_more_claiming)
791 /* We must offer this archive member to the plugins to claim. */
792 const char *filename = (bfd_my_archive (abfd) != NULL
793 ? bfd_my_archive (abfd)->filename : abfd->filename);
794 int fd = open (filename, O_RDONLY | O_BINARY);
797 struct ld_plugin_input_file file;
799 /* Offset and filesize must refer to the individual archive
800 member, not the whole file, and must exclude the header.
801 Fortunately for us, that is how the data is stored in the
802 origin field of the bfd and in the arelt_data. */
803 file.name = filename;
804 file.offset = abfd->origin;
805 file.filesize = arelt_size (abfd);
807 plugin_maybe_claim (&file, input);
808 if (input->flags.claimed)
810 input->flags.claim_archive = TRUE;
811 *subsbfd = input->the_bfd;
815 #endif /* ENABLE_PLUGINS */
817 ldlang_add_file (input);
819 if (config.map_file != NULL)
821 static bfd_boolean header_printed;
822 struct bfd_link_hash_entry *h;
826 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
838 case bfd_link_hash_defined:
839 case bfd_link_hash_defweak:
840 from = h->u.def.section->owner;
843 case bfd_link_hash_undefined:
844 case bfd_link_hash_undefweak:
845 from = h->u.undef.abfd;
848 case bfd_link_hash_common:
849 from = h->u.c.p->section->owner;
854 if (! header_printed)
858 sprintf (buf, _("Archive member included "
859 "to satisfy reference by file (symbol)\n\n"));
861 header_printed = TRUE;
864 if (bfd_my_archive (abfd) == NULL)
866 minfo ("%s", bfd_get_filename (abfd));
867 len = strlen (bfd_get_filename (abfd));
871 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
872 bfd_get_filename (abfd));
873 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
874 + strlen (bfd_get_filename (abfd))
892 minfo ("(%T)\n", h->root.string);
894 minfo ("(%s)\n", name);
897 if (trace_files || verbose)
898 info_msg ("%I\n", &orig_input);
902 /* This is called when BFD has discovered a symbol which is defined
906 multiple_definition (struct bfd_link_info *info,
907 struct bfd_link_hash_entry *h,
917 if (info->allow_multiple_definition)
922 case bfd_link_hash_defined:
923 osec = h->u.def.section;
924 oval = h->u.def.value;
925 obfd = h->u.def.section->owner;
927 case bfd_link_hash_indirect:
928 osec = bfd_ind_section_ptr;
936 /* Ignore a redefinition of an absolute symbol to the
937 same value; it's harmless. */
938 if (h->type == bfd_link_hash_defined
939 && bfd_is_abs_section (osec)
940 && bfd_is_abs_section (nsec)
944 /* If either section has the output_section field set to
945 bfd_abs_section_ptr, it means that the section is being
946 discarded, and this is not really a multiple definition at all.
947 FIXME: It would be cleaner to somehow ignore symbols defined in
948 sections which are being discarded. */
949 if ((osec->output_section != NULL
950 && ! bfd_is_abs_section (osec)
951 && bfd_is_abs_section (osec->output_section))
952 || (nsec->output_section != NULL
953 && ! bfd_is_abs_section (nsec)
954 && bfd_is_abs_section (nsec->output_section)))
957 name = h->root.string;
965 einfo (_("%X%C: multiple definition of `%T'\n"),
966 nbfd, nsec, nval, name);
968 einfo (_("%D: first defined here\n"), obfd, osec, oval);
970 if (RELAXATION_ENABLED_BY_USER)
972 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
979 /* This is called when there is a definition of a common symbol, or
980 when a common symbol is found for a symbol that is already defined,
981 or when two common symbols are found. We only do something if
982 -warn-common was used. */
985 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
986 struct bfd_link_hash_entry *h,
988 enum bfd_link_hash_type ntype,
993 enum bfd_link_hash_type otype;
996 if (!config.warn_common)
999 name = h->root.string;
1001 if (otype == bfd_link_hash_common)
1003 obfd = h->u.c.p->section->owner;
1004 osize = h->u.c.size;
1006 else if (otype == bfd_link_hash_defined
1007 || otype == bfd_link_hash_defweak)
1009 obfd = h->u.def.section->owner;
1014 /* FIXME: It would nice if we could report the BFD which defined
1015 an indirect symbol, but we don't have anywhere to store the
1021 if (ntype == bfd_link_hash_defined
1022 || ntype == bfd_link_hash_defweak
1023 || ntype == bfd_link_hash_indirect)
1025 ASSERT (otype == bfd_link_hash_common);
1026 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1029 einfo (_("%B: warning: common is here\n"), obfd);
1031 else if (otype == bfd_link_hash_defined
1032 || otype == bfd_link_hash_defweak
1033 || otype == bfd_link_hash_indirect)
1035 ASSERT (ntype == bfd_link_hash_common);
1036 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1039 einfo (_("%B: warning: defined here\n"), obfd);
1043 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1046 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1049 einfo (_("%B: warning: larger common is here\n"), obfd);
1051 else if (nsize > osize)
1053 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1056 einfo (_("%B: warning: smaller common is here\n"), obfd);
1060 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1062 einfo (_("%B: warning: previous common is here\n"), obfd);
1069 /* This is called when BFD has discovered a set element. H is the
1070 entry in the linker hash table for the set. SECTION and VALUE
1071 represent a value which should be added to the set. */
1074 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1075 struct bfd_link_hash_entry *h,
1076 bfd_reloc_code_real_type reloc,
1081 if (config.warn_constructors)
1082 einfo (_("%P: warning: global constructor %s used\n"),
1085 if (! config.build_constructors)
1088 ldctor_add_set_entry (h, reloc, NULL, section, value);
1090 if (h->type == bfd_link_hash_new)
1092 h->type = bfd_link_hash_undefined;
1093 h->u.undef.abfd = abfd;
1094 /* We don't call bfd_link_add_undef to add this to the list of
1095 undefined symbols because we are going to define it
1102 /* This is called when BFD has discovered a constructor. This is only
1103 called for some object file formats--those which do not handle
1104 constructors in some more clever fashion. This is similar to
1105 adding an element to a set, but less general. */
1108 constructor_callback (struct bfd_link_info *info,
1109 bfd_boolean constructor,
1116 struct bfd_link_hash_entry *h;
1117 char set_name[1 + sizeof "__CTOR_LIST__"];
1119 if (config.warn_constructors)
1120 einfo (_("%P: warning: global constructor %s used\n"), name);
1122 if (! config.build_constructors)
1125 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1126 useful error message. */
1127 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1128 && (info->relocatable
1129 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1130 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1133 if (bfd_get_symbol_leading_char (abfd) != '\0')
1134 *s++ = bfd_get_symbol_leading_char (abfd);
1136 strcpy (s, "__CTOR_LIST__");
1138 strcpy (s, "__DTOR_LIST__");
1140 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1141 if (h == (struct bfd_link_hash_entry *) NULL)
1142 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1143 if (h->type == bfd_link_hash_new)
1145 h->type = bfd_link_hash_undefined;
1146 h->u.undef.abfd = abfd;
1147 /* We don't call bfd_link_add_undef to add this to the list of
1148 undefined symbols because we are going to define it
1152 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1156 /* A structure used by warning_callback to pass information through
1157 bfd_map_over_sections. */
1159 struct warning_callback_info
1162 const char *warning;
1167 /* Look through the relocs to see if we can find a plausible address
1168 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1171 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1173 struct warning_callback_info cinfo;
1175 if (!bfd_generic_link_read_symbols (abfd))
1176 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1178 cinfo.found = FALSE;
1179 cinfo.warning = warning;
1180 cinfo.symbol = symbol;
1181 cinfo.asymbols = bfd_get_outsymbols (abfd);
1182 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1186 /* This is called when there is a reference to a warning symbol. */
1189 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1190 const char *warning,
1196 /* This is a hack to support warn_multiple_gp. FIXME: This should
1197 have a cleaner interface, but what? */
1198 if (! config.warn_multiple_gp
1199 && strcmp (warning, "using multiple gp values") == 0)
1202 if (section != NULL)
1203 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1204 else if (abfd == NULL)
1205 einfo ("%P: %s%s\n", _("warning: "), warning);
1206 else if (symbol == NULL)
1207 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1208 else if (! symbol_warning (warning, symbol, abfd))
1211 /* Search all input files for a reference to SYMBOL. */
1212 for (b = info->input_bfds; b; b = b->link_next)
1213 if (b != abfd && symbol_warning (warning, symbol, b))
1215 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1221 /* This is called by warning_callback for each section. It checks the
1222 relocs of the section to see if it can find a reference to the
1223 symbol which triggered the warning. If it can, it uses the reloc
1224 to give an error message with a file and line number. */
1227 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1229 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1233 arelent **p, **pend;
1238 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1240 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1244 relpp = (arelent **) xmalloc (relsize);
1245 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1247 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1250 pend = p + relcount;
1251 for (; p < pend && *p != NULL; p++)
1255 if (q->sym_ptr_ptr != NULL
1256 && *q->sym_ptr_ptr != NULL
1257 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1259 /* We found a reloc for the symbol we are looking for. */
1260 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1270 /* This is called when an undefined symbol is found. */
1273 undefined_symbol (struct bfd_link_info *info,
1280 static char *error_name;
1281 static unsigned int error_count;
1283 #define MAX_ERRORS_IN_A_ROW 5
1285 if (info->ignore_hash != NULL
1286 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1289 if (config.warn_once)
1291 /* Only warn once about a particular undefined symbol. */
1292 add_ignoresym (info, name);
1295 /* We never print more than a reasonable number of errors in a row
1296 for a single symbol. */
1297 if (error_name != NULL
1298 && strcmp (name, error_name) == 0)
1303 if (error_name != NULL)
1305 error_name = xstrdup (name);
1308 if (section != NULL)
1310 if (error_count < MAX_ERRORS_IN_A_ROW)
1313 einfo (_("%X%C: undefined reference to `%T'\n"),
1314 abfd, section, address, name);
1316 einfo (_("%C: warning: undefined reference to `%T'\n"),
1317 abfd, section, address, name);
1319 else if (error_count == MAX_ERRORS_IN_A_ROW)
1322 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1323 abfd, section, address, name);
1325 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1326 abfd, section, address, name);
1333 if (error_count < MAX_ERRORS_IN_A_ROW)
1336 einfo (_("%X%B: undefined reference to `%T'\n"),
1339 einfo (_("%B: warning: undefined reference to `%T'\n"),
1342 else if (error_count == MAX_ERRORS_IN_A_ROW)
1345 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1348 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1358 /* Counter to limit the number of relocation overflow error messages
1359 to print. Errors are printed as it is decremented. When it's
1360 called and the counter is zero, a final message is printed
1361 indicating more relocations were omitted. When it gets to -1, no
1362 such errors are printed. If it's initially set to a value less
1363 than -1, all such errors will be printed (--verbose does this). */
1365 int overflow_cutoff_limit = 10;
1367 /* This is called when a reloc overflows. */
1370 reloc_overflow (struct bfd_link_info *info,
1371 struct bfd_link_hash_entry *entry,
1373 const char *reloc_name,
1379 if (overflow_cutoff_limit == -1)
1382 einfo ("%X%H:", abfd, section, address);
1384 if (overflow_cutoff_limit >= 0
1385 && overflow_cutoff_limit-- == 0)
1387 einfo (_(" additional relocation overflows omitted from the output\n"));
1393 while (entry->type == bfd_link_hash_indirect
1394 || entry->type == bfd_link_hash_warning)
1395 entry = entry->u.i.link;
1396 switch (entry->type)
1398 case bfd_link_hash_undefined:
1399 case bfd_link_hash_undefweak:
1400 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1401 reloc_name, entry->root.string);
1403 case bfd_link_hash_defined:
1404 case bfd_link_hash_defweak:
1405 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1406 reloc_name, entry->root.string,
1407 entry->u.def.section,
1408 entry->u.def.section == bfd_abs_section_ptr
1409 ? info->output_bfd : entry->u.def.section->owner);
1417 einfo (_(" relocation truncated to fit: %s against `%T'"),
1420 einfo ("+%v", addend);
1425 /* This is called when a dangerous relocation is made. */
1428 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1429 const char *message,
1434 einfo (_("%X%H: dangerous relocation: %s\n"),
1435 abfd, section, address, message);
1439 /* This is called when a reloc is being generated attached to a symbol
1440 that is not being output. */
1443 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1449 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1450 abfd, section, address, name);
1454 /* This is called if link_info.notice_all is set, or when a symbol in
1455 link_info.notice_hash is found. Symbols are put in notice_hash
1456 using the -y option, while notice_all is set if the --cref option
1457 has been supplied, or if there are any NOCROSSREFS sections in the
1458 linker script; and if plugins are active, since they need to monitor
1459 all references from non-IR files. */
1462 notice (struct bfd_link_info *info,
1463 struct bfd_link_hash_entry *h,
1467 flagword flags ATTRIBUTE_UNUSED,
1468 const char *string ATTRIBUTE_UNUSED)
1474 if (command_line.cref || nocrossref_list != NULL)
1475 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1479 name = h->root.string;
1480 if (info->notice_hash != NULL
1481 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1483 if (bfd_is_und_section (section))
1484 einfo ("%B: reference to %s\n", abfd, name);
1486 einfo ("%B: definition of %s\n", abfd, name);
1489 if (command_line.cref || nocrossref_list != NULL)
1490 add_cref (name, abfd, section, value);