1 /* Main program of GNU linker.
2 Copyright (C) 1991-2015 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"
44 #endif /* ENABLE_PLUGINS */
46 /* Somewhere above, sys/stat.h got included. */
47 #if !defined(S_ISDIR) && defined(S_IFDIR)
48 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
59 #ifndef TARGET_SYSTEM_ROOT
60 #define TARGET_SYSTEM_ROOT ""
65 FILE *saved_script_handle = NULL;
66 FILE *previous_script_handle = NULL;
67 bfd_boolean force_make_executable = FALSE;
70 const char *output_filename = "a.out";
72 /* Name this program was invoked by. */
75 /* The prefix for system library directories. */
76 const char *ld_sysroot;
78 /* The canonical representation of ld_sysroot. */
79 char * ld_canon_sysroot;
80 int ld_canon_sysroot_len;
82 /* Set by -G argument, for targets like MIPS ELF. */
83 int g_switch_value = 8;
85 /* Nonzero means print names of input files as processed. */
86 bfd_boolean trace_files;
88 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
91 /* Nonzero means version number was printed, so exit successfully
92 instead of complaining if no input files are given. */
93 bfd_boolean version_printed;
95 /* TRUE if we should demangle symbol names. */
96 bfd_boolean demangling;
98 args_type command_line;
100 ld_config_type config;
102 sort_type sort_section;
104 static const char *get_sysroot
106 static char *get_emulation
108 static bfd_boolean add_archive_element
109 (struct bfd_link_info *, bfd *, const char *, bfd **);
110 static bfd_boolean multiple_definition
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd *, asection *, bfd_vma);
113 static bfd_boolean multiple_common
114 (struct bfd_link_info *, struct bfd_link_hash_entry *,
115 bfd *, enum bfd_link_hash_type, bfd_vma);
116 static bfd_boolean add_to_set
117 (struct bfd_link_info *, struct bfd_link_hash_entry *,
118 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
119 static bfd_boolean constructor_callback
120 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
121 asection *, bfd_vma);
122 static bfd_boolean warning_callback
123 (struct bfd_link_info *, const char *, const char *, bfd *,
124 asection *, bfd_vma);
125 static void warning_find_reloc
126 (bfd *, asection *, void *);
127 static bfd_boolean undefined_symbol
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
130 static bfd_boolean reloc_overflow
131 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
132 const char *, bfd_vma, bfd *, asection *, bfd_vma);
133 static bfd_boolean reloc_dangerous
134 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
135 static bfd_boolean unattached_reloc
136 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
137 static bfd_boolean notice
138 (struct bfd_link_info *, struct bfd_link_hash_entry *,
139 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
141 static struct bfd_link_callbacks link_callbacks =
147 constructor_callback,
157 ldlang_override_segment_assignment
160 static bfd_assert_handler_type default_bfd_assert_handler;
162 struct bfd_link_info link_info;
167 bfd_cache_close_all ();
168 #ifdef ENABLE_PLUGINS
169 plugin_call_cleanup ();
171 if (output_filename && delete_output_file_on_failure)
172 unlink_if_ordinary (output_filename);
175 /* If there's a BFD assertion, we'll notice and exit with an error
176 unless otherwise instructed. */
179 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
180 const char *file, int line)
182 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
183 config.make_executable = FALSE;
187 main (int argc, char **argv)
190 long start_time = get_run_time ();
192 char *start_sbrk = (char *) sbrk (0);
195 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
196 setlocale (LC_MESSAGES, "");
198 #if defined (HAVE_SETLOCALE)
199 setlocale (LC_CTYPE, "");
201 bindtextdomain (PACKAGE, LOCALEDIR);
202 textdomain (PACKAGE);
204 program_name = argv[0];
205 xmalloc_set_program_name (program_name);
207 START_PROGRESS (program_name, 0);
209 expandargv (&argc, &argv);
213 bfd_set_error_program_name (program_name);
215 /* We want to notice and fail on those nasty BFD assertions which are
216 likely to signal incorrect output being generated but otherwise may
218 default_bfd_assert_handler = bfd_set_assert_handler (ld_bfd_assert_handler);
220 xatexit (ld_cleanup);
222 /* Set up the sysroot directory. */
223 ld_sysroot = get_sysroot (argc, argv);
226 if (*TARGET_SYSTEM_ROOT == 0)
228 einfo ("%P%F: this linker was not configured to use sysroots\n");
232 ld_canon_sysroot = lrealpath (ld_sysroot);
234 if (ld_canon_sysroot)
235 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
237 ld_canon_sysroot_len = -1;
239 /* Set the default BFD target based on the configured target. Doing
240 this permits the linker to be configured for a particular target,
241 and linked against a shared BFD library which was configured for
242 a different target. The macro TARGET is defined by Makefile. */
243 if (! bfd_set_default_target (TARGET))
245 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
256 config.build_constructors = TRUE;
257 config.rpath_separator = ':';
258 config.split_by_reloc = (unsigned) -1;
259 config.split_by_file = (bfd_size_type) -1;
260 config.make_executable = TRUE;
261 config.magic_demand_paged = TRUE;
262 config.text_read_only = TRUE;
263 link_info.disable_target_specific_optimizations = -1;
265 command_line.warn_mismatch = TRUE;
266 command_line.warn_search_mismatch = TRUE;
267 command_line.check_section_addresses = -1;
269 /* We initialize DEMANGLING based on the environment variable
270 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
271 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
272 environment. Acting the same way here lets us provide the same
273 interface by default. */
274 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
276 link_info.allow_undefined_version = TRUE;
277 link_info.keep_memory = TRUE;
278 link_info.combreloc = TRUE;
279 link_info.strip_discarded = TRUE;
280 link_info.emit_hash = TRUE;
281 link_info.callbacks = &link_callbacks;
282 link_info.input_bfds_tail = &link_info.input_bfds;
283 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
284 and _fini symbols. We are compatible. */
285 link_info.init_function = "_init";
286 link_info.fini_function = "_fini";
287 link_info.relax_pass = 1;
288 link_info.extern_protected_data = -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);
301 ldemul_before_parse ();
302 lang_has_input_file = FALSE;
303 parse_args (argc, argv);
305 if (config.hash_table_size != 0)
306 bfd_hash_set_default_size (config.hash_table_size);
308 #ifdef ENABLE_PLUGINS
309 /* Now all the plugin arguments have been gathered, we can load them. */
310 plugin_load_plugins ();
311 #endif /* ENABLE_PLUGINS */
313 ldemul_set_symbols ();
315 /* If we have not already opened and parsed a linker script,
316 try the default script from command line first. */
317 if (saved_script_handle == NULL
318 && command_line.default_script != NULL)
320 ldfile_open_command_file (command_line.default_script);
321 parser_input = input_script;
325 /* If we have not already opened and parsed a linker script
326 read the emulation's appropriate default script. */
327 if (saved_script_handle == NULL)
330 char *s = ldemul_get_script (&isfile);
333 ldfile_open_default_command_file (s);
337 lex_redirect (s, _("built in linker script"), 1);
339 parser_input = input_script;
346 if (saved_script_handle)
347 info_msg (_("using external linker script:"));
349 info_msg (_("using internal linker script:"));
350 info_msg ("\n==================================================\n");
352 if (saved_script_handle)
354 static const int ld_bufsz = 8193;
356 char *buf = (char *) xmalloc (ld_bufsz);
358 rewind (saved_script_handle);
359 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
364 rewind (saved_script_handle);
371 info_msg (ldemul_get_script (&isfile));
374 info_msg ("\n==================================================\n");
377 if (command_line.print_output_format)
378 info_msg ("%s\n", lang_get_output_target ());
382 /* If the only command line argument has been -v or --version or --verbose
383 then ignore any input files provided by linker scripts and exit now.
384 We do not want to create an output file when the linker is just invoked
385 to provide version information. */
386 if (argc == 2 && version_printed)
389 if (!lang_has_input_file)
391 if (version_printed || command_line.print_output_format)
393 einfo (_("%P%F: no input files\n"));
397 info_msg (_("%P: mode %s\n"), emulation);
399 ldemul_after_parse ();
401 if (config.map_filename)
403 if (strcmp (config.map_filename, "-") == 0)
405 config.map_file = stdout;
409 config.map_file = fopen (config.map_filename, FOPEN_WT);
410 if (config.map_file == (FILE *) NULL)
412 bfd_set_error (bfd_error_system_call);
413 einfo (_("%P%F: cannot open map file %s: %E\n"),
414 config.map_filename);
421 /* Print error messages for any missing symbols, for any warning
422 symbols, and possibly multiple definitions. */
423 if (link_info.relocatable)
424 link_info.output_bfd->flags &= ~EXEC_P;
426 link_info.output_bfd->flags |= EXEC_P;
428 if ((link_info.compress_debug & COMPRESS_DEBUG))
430 link_info.output_bfd->flags |= BFD_COMPRESS;
431 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
432 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
437 if (config.map_file != NULL)
439 if (command_line.cref)
440 output_cref (config.map_file != NULL ? config.map_file : stdout);
441 if (nocrossref_list != NULL)
442 check_nocrossrefs ();
445 struct bfd_link_hash_entry * h;
447 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
448 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
454 /* Even if we're producing relocatable output, some non-fatal errors should
455 be reported in the exit status. (What non-fatal errors, if any, do we
456 want to ignore for relocatable output?) */
457 if (!config.make_executable && !force_make_executable)
460 einfo (_("%P: link errors found, deleting executable `%s'\n"),
463 /* The file will be removed by ld_cleanup. */
468 if (! bfd_close (link_info.output_bfd))
469 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
471 /* If the --force-exe-suffix is enabled, and we're making an
472 executable file and it doesn't end in .exe, copy it to one
474 if (! link_info.relocatable && command_line.force_exe_suffix)
476 int len = strlen (output_filename);
479 || (strcasecmp (output_filename + len - 4, ".exe") != 0
480 && strcasecmp (output_filename + len - 4, ".dll") != 0))
484 const int bsize = 4096;
485 char *buf = (char *) xmalloc (bsize);
487 char *dst_name = (char *) xmalloc (len + 5);
489 strcpy (dst_name, output_filename);
490 strcat (dst_name, ".exe");
491 src = fopen (output_filename, FOPEN_RB);
492 dst = fopen (dst_name, FOPEN_WB);
495 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
498 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
500 while ((l = fread (buf, 1, bsize, src)) > 0)
502 int done = fwrite (buf, 1, l, dst);
505 einfo (_("%P: Error writing file `%s'\n"), dst_name);
509 if (fclose (dst) == EOF)
510 einfo (_("%P: Error closing file `%s'\n"), dst_name);
517 END_PROGRESS (program_name);
522 char *lim = (char *) sbrk (0);
524 long run_time = get_run_time () - start_time;
527 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
528 program_name, run_time / 1000000, run_time % 1000000);
530 fprintf (stderr, _("%s: data size %ld\n"), program_name,
531 (long) (lim - start_sbrk));
536 /* Prevent ld_cleanup from doing anything, after a successful link. */
537 output_filename = NULL;
543 /* If the configured sysroot is relocatable, try relocating it based on
544 default prefix FROM. Return the relocated directory if it exists,
545 otherwise return null. */
548 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
550 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
554 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
557 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
565 /* Return the sysroot directory. Return "" if no sysroot is being used. */
568 get_sysroot (int argc, char **argv)
573 for (i = 1; i < argc; i++)
574 if (CONST_STRNEQ (argv[i], "--sysroot="))
575 return argv[i] + strlen ("--sysroot=");
577 path = get_relative_sysroot (BINDIR);
581 path = get_relative_sysroot (TOOLBINDIR);
585 return TARGET_SYSTEM_ROOT;
588 /* We need to find any explicitly given emulation in order to initialize the
589 state that's needed by the lex&yacc argument parser (parse_args). */
592 get_emulation (int argc, char **argv)
597 emulation = getenv (EMULATION_ENVIRON);
598 if (emulation == NULL)
599 emulation = DEFAULT_EMULATION;
601 for (i = 1; i < argc; i++)
603 if (CONST_STRNEQ (argv[i], "-m"))
605 if (argv[i][2] == '\0')
610 emulation = argv[i + 1];
614 einfo (_("%P%F: missing argument to -m\n"));
616 else if (strcmp (argv[i], "-mips1") == 0
617 || strcmp (argv[i], "-mips2") == 0
618 || strcmp (argv[i], "-mips3") == 0
619 || strcmp (argv[i], "-mips4") == 0
620 || strcmp (argv[i], "-mips5") == 0
621 || strcmp (argv[i], "-mips32") == 0
622 || strcmp (argv[i], "-mips32r2") == 0
623 || strcmp (argv[i], "-mips32r6") == 0
624 || strcmp (argv[i], "-mips64") == 0
625 || strcmp (argv[i], "-mips64r2") == 0
626 || strcmp (argv[i], "-mips64r6") == 0)
628 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
629 passed to the linker by some MIPS compilers. They
630 generally tell the linker to use a slightly different
631 library path. Perhaps someday these should be
632 implemented as emulations; until then, we just ignore
633 the arguments and hope that nobody ever creates
634 emulations named ips1, ips2 or ips3. */
636 else if (strcmp (argv[i], "-m486") == 0)
638 /* FIXME: The argument -m486 is passed to the linker on
639 some Linux systems. Hope that nobody creates an
640 emulation named 486. */
645 emulation = &argv[i][2];
654 add_ysym (const char *name)
656 if (link_info.notice_hash == NULL)
658 link_info.notice_hash =
659 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
660 if (!bfd_hash_table_init_n (link_info.notice_hash,
662 sizeof (struct bfd_hash_entry),
664 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
667 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
668 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
672 add_ignoresym (struct bfd_link_info *info, const char *name)
674 if (info->ignore_hash == NULL)
676 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
677 if (! bfd_hash_table_init_n (info->ignore_hash,
679 sizeof (struct bfd_hash_entry),
681 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
684 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
685 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
688 /* Record a symbol to be wrapped, from the --wrap option. */
691 add_wrap (const char *name)
693 if (link_info.wrap_hash == NULL)
695 link_info.wrap_hash =
696 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
697 if (!bfd_hash_table_init_n (link_info.wrap_hash,
699 sizeof (struct bfd_hash_entry),
701 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
704 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
705 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
708 /* Handle the -retain-symbols-file option. */
711 add_keepsyms_file (const char *filename)
718 if (link_info.strip == strip_some)
719 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
721 file = fopen (filename, "r");
724 bfd_set_error (bfd_error_system_call);
725 einfo ("%X%P: %s: %E\n", filename);
729 link_info.keep_hash = (struct bfd_hash_table *)
730 xmalloc (sizeof (struct bfd_hash_table));
731 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
732 sizeof (struct bfd_hash_entry)))
733 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
736 buf = (char *) xmalloc (bufsize);
748 while (! ISSPACE (c) && c != EOF)
755 buf = (char *) xrealloc (buf, bufsize);
762 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
763 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
767 if (link_info.strip != strip_none)
768 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
771 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,
784 bfd **subsbfd ATTRIBUTE_UNUSED)
786 lang_input_statement_type *input;
787 lang_input_statement_type orig_input;
789 input = (lang_input_statement_type *)
790 xcalloc (1, sizeof (lang_input_statement_type));
791 input->filename = abfd->filename;
792 input->local_sym_name = abfd->filename;
793 input->the_bfd = abfd;
795 /* Save the original data for trace files/tries below, as plugins
796 (if enabled) may possibly alter it to point to a replacement
797 BFD, but we still want to output the original BFD filename. */
799 #ifdef ENABLE_PLUGINS
800 if (link_info.lto_plugin_active && !no_more_claiming)
802 /* We must offer this archive member to the plugins to claim. */
803 plugin_maybe_claim (input);
804 if (input->flags.claimed)
806 input->flags.claim_archive = TRUE;
807 *subsbfd = input->the_bfd;
810 #endif /* ENABLE_PLUGINS */
812 ldlang_add_file (input);
814 if (config.map_file != NULL)
816 static bfd_boolean header_printed;
817 struct bfd_link_hash_entry *h;
821 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
833 case bfd_link_hash_defined:
834 case bfd_link_hash_defweak:
835 from = h->u.def.section->owner;
838 case bfd_link_hash_undefined:
839 case bfd_link_hash_undefweak:
840 from = h->u.undef.abfd;
843 case bfd_link_hash_common:
844 from = h->u.c.p->section->owner;
849 if (! header_printed)
853 sprintf (buf, _("Archive member included "
854 "to satisfy reference by file (symbol)\n\n"));
856 header_printed = TRUE;
859 if (bfd_my_archive (abfd) == NULL)
861 minfo ("%s", bfd_get_filename (abfd));
862 len = strlen (bfd_get_filename (abfd));
866 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
867 bfd_get_filename (abfd));
868 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
869 + strlen (bfd_get_filename (abfd))
887 minfo ("(%T)\n", h->root.string);
889 minfo ("(%s)\n", name);
892 if (trace_files || verbose)
893 info_msg ("%I\n", &orig_input);
897 /* This is called when BFD has discovered a symbol which is defined
901 multiple_definition (struct bfd_link_info *info,
902 struct bfd_link_hash_entry *h,
912 if (info->allow_multiple_definition)
917 case bfd_link_hash_defined:
918 osec = h->u.def.section;
919 oval = h->u.def.value;
920 obfd = h->u.def.section->owner;
922 case bfd_link_hash_indirect:
923 osec = bfd_ind_section_ptr;
931 /* Ignore a redefinition of an absolute symbol to the
932 same value; it's harmless. */
933 if (h->type == bfd_link_hash_defined
934 && bfd_is_abs_section (osec)
935 && bfd_is_abs_section (nsec)
939 /* If either section has the output_section field set to
940 bfd_abs_section_ptr, it means that the section is being
941 discarded, and this is not really a multiple definition at all.
942 FIXME: It would be cleaner to somehow ignore symbols defined in
943 sections which are being discarded. */
944 if ((osec->output_section != NULL
945 && ! bfd_is_abs_section (osec)
946 && bfd_is_abs_section (osec->output_section))
947 || (nsec->output_section != NULL
948 && ! bfd_is_abs_section (nsec)
949 && bfd_is_abs_section (nsec->output_section)))
952 name = h->root.string;
960 einfo (_("%X%C: multiple definition of `%T'\n"),
961 nbfd, nsec, nval, name);
963 einfo (_("%D: first defined here\n"), obfd, osec, oval);
965 if (RELAXATION_ENABLED_BY_USER)
967 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
974 /* This is called when there is a definition of a common symbol, or
975 when a common symbol is found for a symbol that is already defined,
976 or when two common symbols are found. We only do something if
977 -warn-common was used. */
980 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
981 struct bfd_link_hash_entry *h,
983 enum bfd_link_hash_type ntype,
988 enum bfd_link_hash_type otype;
991 if (!config.warn_common)
994 name = h->root.string;
996 if (otype == bfd_link_hash_common)
998 obfd = h->u.c.p->section->owner;
1001 else if (otype == bfd_link_hash_defined
1002 || otype == bfd_link_hash_defweak)
1004 obfd = h->u.def.section->owner;
1009 /* FIXME: It would nice if we could report the BFD which defined
1010 an indirect symbol, but we don't have anywhere to store the
1016 if (ntype == bfd_link_hash_defined
1017 || ntype == bfd_link_hash_defweak
1018 || ntype == bfd_link_hash_indirect)
1020 ASSERT (otype == bfd_link_hash_common);
1021 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1024 einfo (_("%B: warning: common is here\n"), obfd);
1026 else if (otype == bfd_link_hash_defined
1027 || otype == bfd_link_hash_defweak
1028 || otype == bfd_link_hash_indirect)
1030 ASSERT (ntype == bfd_link_hash_common);
1031 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1034 einfo (_("%B: warning: defined here\n"), obfd);
1038 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1041 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1044 einfo (_("%B: warning: larger common is here\n"), obfd);
1046 else if (nsize > osize)
1048 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1051 einfo (_("%B: warning: smaller common is here\n"), obfd);
1055 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1057 einfo (_("%B: warning: previous common is here\n"), obfd);
1064 /* This is called when BFD has discovered a set element. H is the
1065 entry in the linker hash table for the set. SECTION and VALUE
1066 represent a value which should be added to the set. */
1069 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1070 struct bfd_link_hash_entry *h,
1071 bfd_reloc_code_real_type reloc,
1076 if (config.warn_constructors)
1077 einfo (_("%P: warning: global constructor %s used\n"),
1080 if (! config.build_constructors)
1083 ldctor_add_set_entry (h, reloc, NULL, section, value);
1085 if (h->type == bfd_link_hash_new)
1087 h->type = bfd_link_hash_undefined;
1088 h->u.undef.abfd = abfd;
1089 /* We don't call bfd_link_add_undef to add this to the list of
1090 undefined symbols because we are going to define it
1097 /* This is called when BFD has discovered a constructor. This is only
1098 called for some object file formats--those which do not handle
1099 constructors in some more clever fashion. This is similar to
1100 adding an element to a set, but less general. */
1103 constructor_callback (struct bfd_link_info *info,
1104 bfd_boolean constructor,
1111 struct bfd_link_hash_entry *h;
1112 char set_name[1 + sizeof "__CTOR_LIST__"];
1114 if (config.warn_constructors)
1115 einfo (_("%P: warning: global constructor %s used\n"), name);
1117 if (! config.build_constructors)
1120 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1121 useful error message. */
1122 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1123 && (info->relocatable
1124 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1125 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1128 if (bfd_get_symbol_leading_char (abfd) != '\0')
1129 *s++ = bfd_get_symbol_leading_char (abfd);
1131 strcpy (s, "__CTOR_LIST__");
1133 strcpy (s, "__DTOR_LIST__");
1135 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1136 if (h == (struct bfd_link_hash_entry *) NULL)
1137 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1138 if (h->type == bfd_link_hash_new)
1140 h->type = bfd_link_hash_undefined;
1141 h->u.undef.abfd = abfd;
1142 /* We don't call bfd_link_add_undef to add this to the list of
1143 undefined symbols because we are going to define it
1147 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1151 /* A structure used by warning_callback to pass information through
1152 bfd_map_over_sections. */
1154 struct warning_callback_info
1157 const char *warning;
1162 /* Look through the relocs to see if we can find a plausible address
1163 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1166 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1168 struct warning_callback_info cinfo;
1170 if (!bfd_generic_link_read_symbols (abfd))
1171 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1173 cinfo.found = FALSE;
1174 cinfo.warning = warning;
1175 cinfo.symbol = symbol;
1176 cinfo.asymbols = bfd_get_outsymbols (abfd);
1177 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1181 /* This is called when there is a reference to a warning symbol. */
1184 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1185 const char *warning,
1191 /* This is a hack to support warn_multiple_gp. FIXME: This should
1192 have a cleaner interface, but what? */
1193 if (! config.warn_multiple_gp
1194 && strcmp (warning, "using multiple gp values") == 0)
1197 if (section != NULL)
1198 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1199 else if (abfd == NULL)
1200 einfo ("%P: %s%s\n", _("warning: "), warning);
1201 else if (symbol == NULL)
1202 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1203 else if (! symbol_warning (warning, symbol, abfd))
1206 /* Search all input files for a reference to SYMBOL. */
1207 for (b = info->input_bfds; b; b = b->link.next)
1208 if (b != abfd && symbol_warning (warning, symbol, b))
1210 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1216 /* This is called by warning_callback for each section. It checks the
1217 relocs of the section to see if it can find a reference to the
1218 symbol which triggered the warning. If it can, it uses the reloc
1219 to give an error message with a file and line number. */
1222 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1224 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1228 arelent **p, **pend;
1233 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1235 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1239 relpp = (arelent **) xmalloc (relsize);
1240 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1242 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1245 pend = p + relcount;
1246 for (; p < pend && *p != NULL; p++)
1250 if (q->sym_ptr_ptr != NULL
1251 && *q->sym_ptr_ptr != NULL
1252 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1254 /* We found a reloc for the symbol we are looking for. */
1255 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1265 /* This is called when an undefined symbol is found. */
1268 undefined_symbol (struct bfd_link_info *info,
1275 static char *error_name;
1276 static unsigned int error_count;
1278 #define MAX_ERRORS_IN_A_ROW 5
1280 if (info->ignore_hash != NULL
1281 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1284 if (config.warn_once)
1286 /* Only warn once about a particular undefined symbol. */
1287 add_ignoresym (info, name);
1290 /* We never print more than a reasonable number of errors in a row
1291 for a single symbol. */
1292 if (error_name != NULL
1293 && strcmp (name, error_name) == 0)
1298 if (error_name != NULL)
1300 error_name = xstrdup (name);
1303 if (section != NULL)
1305 if (error_count < MAX_ERRORS_IN_A_ROW)
1308 einfo (_("%X%C: undefined reference to `%T'\n"),
1309 abfd, section, address, name);
1311 einfo (_("%C: warning: undefined reference to `%T'\n"),
1312 abfd, section, address, name);
1314 else if (error_count == MAX_ERRORS_IN_A_ROW)
1317 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1318 abfd, section, address, name);
1320 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1321 abfd, section, address, name);
1328 if (error_count < MAX_ERRORS_IN_A_ROW)
1331 einfo (_("%X%B: undefined reference to `%T'\n"),
1334 einfo (_("%B: warning: undefined reference to `%T'\n"),
1337 else if (error_count == MAX_ERRORS_IN_A_ROW)
1340 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1343 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1353 /* Counter to limit the number of relocation overflow error messages
1354 to print. Errors are printed as it is decremented. When it's
1355 called and the counter is zero, a final message is printed
1356 indicating more relocations were omitted. When it gets to -1, no
1357 such errors are printed. If it's initially set to a value less
1358 than -1, all such errors will be printed (--verbose does this). */
1360 int overflow_cutoff_limit = 10;
1362 /* This is called when a reloc overflows. */
1365 reloc_overflow (struct bfd_link_info *info,
1366 struct bfd_link_hash_entry *entry,
1368 const char *reloc_name,
1374 if (overflow_cutoff_limit == -1)
1377 einfo ("%X%H:", abfd, section, address);
1379 if (overflow_cutoff_limit >= 0
1380 && overflow_cutoff_limit-- == 0)
1382 einfo (_(" additional relocation overflows omitted from the output\n"));
1388 while (entry->type == bfd_link_hash_indirect
1389 || entry->type == bfd_link_hash_warning)
1390 entry = entry->u.i.link;
1391 switch (entry->type)
1393 case bfd_link_hash_undefined:
1394 case bfd_link_hash_undefweak:
1395 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1396 reloc_name, entry->root.string);
1398 case bfd_link_hash_defined:
1399 case bfd_link_hash_defweak:
1400 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1401 reloc_name, entry->root.string,
1402 entry->u.def.section,
1403 entry->u.def.section == bfd_abs_section_ptr
1404 ? info->output_bfd : entry->u.def.section->owner);
1412 einfo (_(" relocation truncated to fit: %s against `%T'"),
1415 einfo ("+%v", addend);
1420 /* This is called when a dangerous relocation is made. */
1423 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1424 const char *message,
1429 einfo (_("%X%H: dangerous relocation: %s\n"),
1430 abfd, section, address, message);
1434 /* This is called when a reloc is being generated attached to a symbol
1435 that is not being output. */
1438 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1444 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1445 abfd, section, address, name);
1449 /* This is called if link_info.notice_all is set, or when a symbol in
1450 link_info.notice_hash is found. Symbols are put in notice_hash
1451 using the -y option, while notice_all is set if the --cref option
1452 has been supplied, or if there are any NOCROSSREFS sections in the
1453 linker script; and if plugins are active, since they need to monitor
1454 all references from non-IR files. */
1457 notice (struct bfd_link_info *info,
1458 struct bfd_link_hash_entry *h,
1459 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1463 flagword flags ATTRIBUTE_UNUSED)
1469 if (command_line.cref || nocrossref_list != NULL)
1470 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1474 name = h->root.string;
1475 if (info->notice_hash != NULL
1476 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1478 if (bfd_is_und_section (section))
1479 einfo ("%B: reference to %s\n", abfd, name);
1481 einfo ("%B: definition of %s\n", abfd, name);
1484 if (command_line.cref || nocrossref_list != NULL)
1485 add_cref (name, abfd, section, value);