1 /* Main program of GNU linker.
2 Copyright (C) 1991-2018 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)
53 #ifndef TARGET_SYSTEM_ROOT
54 #define TARGET_SYSTEM_ROOT ""
59 FILE *saved_script_handle = NULL;
60 FILE *previous_script_handle = NULL;
61 bfd_boolean force_make_executable = FALSE;
64 const char *output_filename = "a.out";
66 /* Name this program was invoked by. */
69 /* The prefix for system library directories. */
70 const char *ld_sysroot;
72 /* The canonical representation of ld_sysroot. */
73 char *ld_canon_sysroot;
74 int ld_canon_sysroot_len;
76 /* Set by -G argument, for targets like MIPS ELF. */
77 int g_switch_value = 8;
79 /* Nonzero means print names of input files as processed. */
80 bfd_boolean trace_files;
82 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
85 /* Nonzero means version number was printed, so exit successfully
86 instead of complaining if no input files are given. */
87 bfd_boolean version_printed;
89 /* TRUE if we should demangle symbol names. */
90 bfd_boolean demangling;
92 args_type command_line;
94 ld_config_type config;
96 sort_type sort_section;
98 static const char *get_sysroot
100 static char *get_emulation
102 static bfd_boolean add_archive_element
103 (struct bfd_link_info *, bfd *, const char *, bfd **);
104 static void multiple_definition
105 (struct bfd_link_info *, struct bfd_link_hash_entry *,
106 bfd *, asection *, bfd_vma);
107 static void multiple_common
108 (struct bfd_link_info *, struct bfd_link_hash_entry *,
109 bfd *, enum bfd_link_hash_type, bfd_vma);
110 static void add_to_set
111 (struct bfd_link_info *, struct bfd_link_hash_entry *,
112 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
113 static void constructor_callback
114 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
115 asection *, bfd_vma);
116 static void warning_callback
117 (struct bfd_link_info *, const char *, const char *, bfd *,
118 asection *, bfd_vma);
119 static void warning_find_reloc
120 (bfd *, asection *, void *);
121 static void undefined_symbol
122 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
124 static void reloc_overflow
125 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
126 const char *, bfd_vma, bfd *, asection *, bfd_vma);
127 static void reloc_dangerous
128 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
129 static void unattached_reloc
130 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
131 static bfd_boolean notice
132 (struct bfd_link_info *, struct bfd_link_hash_entry *,
133 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
135 static struct bfd_link_callbacks link_callbacks =
141 constructor_callback,
151 ldlang_override_segment_assignment
154 static bfd_assert_handler_type default_bfd_assert_handler;
155 static bfd_error_handler_type default_bfd_error_handler;
157 struct bfd_link_info link_info;
162 bfd_cache_close_all ();
163 #ifdef ENABLE_PLUGINS
164 plugin_call_cleanup ();
166 if (output_filename && delete_output_file_on_failure)
167 unlink_if_ordinary (output_filename);
170 /* Hook to notice BFD assertions. */
173 ld_bfd_assert_handler (const char *fmt, const char *bfdver,
174 const char *file, int line)
176 config.make_executable = FALSE;
177 (*default_bfd_assert_handler) (fmt, bfdver, file, line);
180 /* Hook the bfd error/warning handler for --fatal-warnings. */
183 ld_bfd_error_handler (const char *fmt, va_list ap)
185 if (config.fatal_warnings)
186 config.make_executable = FALSE;
187 (*default_bfd_error_handler) (fmt, ap);
191 main (int argc, char **argv)
194 long start_time = get_run_time ();
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 /* Also hook the bfd error/warning handler for --fatal-warnings. */
222 default_bfd_error_handler = bfd_set_error_handler (ld_bfd_error_handler);
224 xatexit (ld_cleanup);
226 /* Set up the sysroot directory. */
227 ld_sysroot = get_sysroot (argc, argv);
229 ld_canon_sysroot = lrealpath (ld_sysroot);
230 if (ld_canon_sysroot)
232 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
234 /* is_sysrooted_pathname() relies on no trailing dirsep. */
235 if (ld_canon_sysroot_len > 0
236 && IS_DIR_SEPARATOR (ld_canon_sysroot [ld_canon_sysroot_len - 1]))
237 ld_canon_sysroot [--ld_canon_sysroot_len] = '\0';
240 ld_canon_sysroot_len = -1;
242 /* Set the default BFD target based on the configured target. Doing
243 this permits the linker to be configured for a particular target,
244 and linked against a shared BFD library which was configured for
245 a different target. The macro TARGET is defined by Makefile. */
246 if (!bfd_set_default_target (TARGET))
248 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
259 config.build_constructors = TRUE;
260 config.rpath_separator = ':';
261 config.split_by_reloc = (unsigned) -1;
262 config.split_by_file = (bfd_size_type) -1;
263 config.make_executable = TRUE;
264 config.magic_demand_paged = TRUE;
265 config.text_read_only = TRUE;
266 link_info.disable_target_specific_optimizations = -1;
268 command_line.warn_mismatch = TRUE;
269 command_line.warn_search_mismatch = TRUE;
270 command_line.check_section_addresses = -1;
272 /* We initialize DEMANGLING based on the environment variable
273 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
274 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
275 environment. Acting the same way here lets us provide the same
276 interface by default. */
277 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
279 link_info.allow_undefined_version = TRUE;
280 link_info.keep_memory = TRUE;
281 link_info.combreloc = TRUE;
282 link_info.strip_discarded = TRUE;
283 link_info.emit_hash = DEFAULT_EMIT_SYSV_HASH;
284 link_info.emit_gnu_hash = DEFAULT_EMIT_GNU_HASH;
285 link_info.callbacks = &link_callbacks;
286 link_info.input_bfds_tail = &link_info.input_bfds;
287 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
288 and _fini symbols. We are compatible. */
289 link_info.init_function = "_init";
290 link_info.fini_function = "_fini";
291 link_info.relax_pass = 1;
292 link_info.extern_protected_data = -1;
293 link_info.dynamic_undefined_weak = -1;
294 link_info.pei386_auto_import = -1;
295 link_info.spare_dynamic_tags = 5;
296 link_info.path_separator = ':';
297 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
298 link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
300 #ifdef DEFAULT_NEW_DTAGS
301 link_info.new_dtags = DEFAULT_NEW_DTAGS;
304 ldfile_add_arch ("");
305 emulation = get_emulation (argc, argv);
306 ldemul_choose_mode (emulation);
307 default_target = ldemul_choose_target (argc, argv);
308 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
309 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
312 ldemul_before_parse ();
313 lang_has_input_file = FALSE;
314 parse_args (argc, argv);
316 if (config.hash_table_size != 0)
317 bfd_hash_set_default_size (config.hash_table_size);
319 #ifdef ENABLE_PLUGINS
320 /* Now all the plugin arguments have been gathered, we can load them. */
321 plugin_load_plugins ();
322 #endif /* ENABLE_PLUGINS */
324 ldemul_set_symbols ();
326 /* If we have not already opened and parsed a linker script,
327 try the default script from command line first. */
328 if (saved_script_handle == NULL
329 && command_line.default_script != NULL)
331 ldfile_open_command_file (command_line.default_script);
332 parser_input = input_script;
336 /* If we have not already opened and parsed a linker script
337 read the emulation's appropriate default script. */
338 if (saved_script_handle == NULL)
341 char *s = ldemul_get_script (&isfile);
344 ldfile_open_default_command_file (s);
348 lex_redirect (s, _("built in linker script"), 1);
350 parser_input = input_script;
357 if (saved_script_handle)
358 info_msg (_("using external linker script:"));
360 info_msg (_("using internal linker script:"));
361 info_msg ("\n==================================================\n");
363 if (saved_script_handle)
365 static const int ld_bufsz = 8193;
367 char *buf = (char *) xmalloc (ld_bufsz);
369 rewind (saved_script_handle);
370 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
373 info_msg ("%s", buf);
375 rewind (saved_script_handle);
382 info_msg (ldemul_get_script (&isfile));
385 info_msg ("\n==================================================\n");
388 if (command_line.force_group_allocation
389 || !bfd_link_relocatable (&link_info))
390 link_info.resolve_section_groups = TRUE;
392 link_info.resolve_section_groups = FALSE;
394 if (command_line.print_output_format)
395 info_msg ("%s\n", lang_get_output_target ());
399 /* If the only command line argument has been -v or --version or --verbose
400 then ignore any input files provided by linker scripts and exit now.
401 We do not want to create an output file when the linker is just invoked
402 to provide version information. */
403 if (argc == 2 && version_printed)
406 if (link_info.inhibit_common_definition && !bfd_link_dll (&link_info))
407 einfo (_("%F%P: --no-define-common may not be used without -shared\n"));
409 if (!lang_has_input_file)
411 if (version_printed || command_line.print_output_format)
413 einfo (_("%F%P: no input files\n"));
417 info_msg (_("%P: mode %s\n"), emulation);
419 ldemul_after_parse ();
421 if (config.map_filename)
423 if (strcmp (config.map_filename, "-") == 0)
425 config.map_file = stdout;
429 config.map_file = fopen (config.map_filename, FOPEN_WT);
430 if (config.map_file == (FILE *) NULL)
432 bfd_set_error (bfd_error_system_call);
433 einfo (_("%F%P: cannot open map file %s: %E\n"),
434 config.map_filename);
441 /* Print error messages for any missing symbols, for any warning
442 symbols, and possibly multiple definitions. */
443 if (bfd_link_relocatable (&link_info))
444 link_info.output_bfd->flags &= ~EXEC_P;
446 link_info.output_bfd->flags |= EXEC_P;
448 if ((link_info.compress_debug & COMPRESS_DEBUG))
450 link_info.output_bfd->flags |= BFD_COMPRESS;
451 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
452 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
457 if (config.map_file != NULL)
459 if (command_line.cref)
460 output_cref (config.map_file != NULL ? config.map_file : stdout);
461 if (nocrossref_list != NULL)
462 check_nocrossrefs ();
463 if (command_line.print_memory_usage)
464 lang_print_memory_usage ();
467 struct bfd_link_hash_entry *h;
469 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
470 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
476 /* Even if we're producing relocatable output, some non-fatal errors should
477 be reported in the exit status. (What non-fatal errors, if any, do we
478 want to ignore for relocatable output?) */
479 if (!config.make_executable && !force_make_executable)
482 einfo (_("%P: link errors found, deleting executable `%s'\n"),
485 /* The file will be removed by ld_cleanup. */
490 if (!bfd_close (link_info.output_bfd))
491 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info.output_bfd);
493 /* If the --force-exe-suffix is enabled, and we're making an
494 executable file and it doesn't end in .exe, copy it to one
496 if (!bfd_link_relocatable (&link_info)
497 && command_line.force_exe_suffix)
499 int len = strlen (output_filename);
502 || (strcasecmp (output_filename + len - 4, ".exe") != 0
503 && strcasecmp (output_filename + len - 4, ".dll") != 0))
507 const int bsize = 4096;
508 char *buf = (char *) xmalloc (bsize);
510 char *dst_name = (char *) xmalloc (len + 5);
512 strcpy (dst_name, output_filename);
513 strcat (dst_name, ".exe");
514 src = fopen (output_filename, FOPEN_RB);
515 dst = fopen (dst_name, FOPEN_WB);
518 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
521 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
523 while ((l = fread (buf, 1, bsize, src)) > 0)
525 int done = fwrite (buf, 1, l, dst);
528 einfo (_("%P: error writing file `%s'\n"), dst_name);
532 if (fclose (dst) == EOF)
533 einfo (_("%P: error closing file `%s'\n"), dst_name);
540 END_PROGRESS (program_name);
544 long run_time = get_run_time () - start_time;
547 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
548 program_name, run_time / 1000000, run_time % 1000000);
552 /* Prevent ld_cleanup from doing anything, after a successful link. */
553 output_filename = NULL;
559 /* If the configured sysroot is relocatable, try relocating it based on
560 default prefix FROM. Return the relocated directory if it exists,
561 otherwise return null. */
564 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
566 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
570 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
573 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
581 /* Return the sysroot directory. Return "" if no sysroot is being used. */
584 get_sysroot (int argc, char **argv)
589 for (i = 1; i < argc; i++)
590 if (CONST_STRNEQ (argv[i], "--sysroot="))
591 return argv[i] + strlen ("--sysroot=");
593 path = get_relative_sysroot (BINDIR);
597 path = get_relative_sysroot (TOOLBINDIR);
601 return TARGET_SYSTEM_ROOT;
604 /* We need to find any explicitly given emulation in order to initialize the
605 state that's needed by the lex&yacc argument parser (parse_args). */
608 get_emulation (int argc, char **argv)
613 emulation = getenv (EMULATION_ENVIRON);
614 if (emulation == NULL)
615 emulation = DEFAULT_EMULATION;
617 for (i = 1; i < argc; i++)
619 if (CONST_STRNEQ (argv[i], "-m"))
621 if (argv[i][2] == '\0')
626 emulation = argv[i + 1];
630 einfo (_("%F%P: missing argument to -m\n"));
632 else if (strcmp (argv[i], "-mips1") == 0
633 || strcmp (argv[i], "-mips2") == 0
634 || strcmp (argv[i], "-mips3") == 0
635 || strcmp (argv[i], "-mips4") == 0
636 || strcmp (argv[i], "-mips5") == 0
637 || strcmp (argv[i], "-mips32") == 0
638 || strcmp (argv[i], "-mips32r2") == 0
639 || strcmp (argv[i], "-mips32r6") == 0
640 || strcmp (argv[i], "-mips64") == 0
641 || strcmp (argv[i], "-mips64r2") == 0
642 || strcmp (argv[i], "-mips64r6") == 0)
644 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
645 passed to the linker by some MIPS compilers. They
646 generally tell the linker to use a slightly different
647 library path. Perhaps someday these should be
648 implemented as emulations; until then, we just ignore
649 the arguments and hope that nobody ever creates
650 emulations named ips1, ips2 or ips3. */
652 else if (strcmp (argv[i], "-m486") == 0)
654 /* FIXME: The argument -m486 is passed to the linker on
655 some Linux systems. Hope that nobody creates an
656 emulation named 486. */
661 emulation = &argv[i][2];
670 add_ysym (const char *name)
672 if (link_info.notice_hash == NULL)
674 link_info.notice_hash
675 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
676 if (!bfd_hash_table_init_n (link_info.notice_hash,
678 sizeof (struct bfd_hash_entry),
680 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
683 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
684 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
688 add_ignoresym (struct bfd_link_info *info, const char *name)
690 if (info->ignore_hash == NULL)
692 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
693 if (!bfd_hash_table_init_n (info->ignore_hash,
695 sizeof (struct bfd_hash_entry),
697 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
700 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
701 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
704 /* Record a symbol to be wrapped, from the --wrap option. */
707 add_wrap (const char *name)
709 if (link_info.wrap_hash == NULL)
712 = (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
713 if (!bfd_hash_table_init_n (link_info.wrap_hash,
715 sizeof (struct bfd_hash_entry),
717 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
720 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
721 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
724 /* Handle the -retain-symbols-file option. */
727 add_keepsyms_file (const char *filename)
734 if (link_info.strip == strip_some)
735 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
737 file = fopen (filename, "r");
740 bfd_set_error (bfd_error_system_call);
741 einfo ("%X%P: %s: %E\n", filename);
745 link_info.keep_hash = (struct bfd_hash_table *)
746 xmalloc (sizeof (struct bfd_hash_table));
747 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
748 sizeof (struct bfd_hash_entry)))
749 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
752 buf = (char *) xmalloc (bufsize);
764 while (!ISSPACE (c) && c != EOF)
771 buf = (char *) xrealloc (buf, bufsize);
778 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
779 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
783 if (link_info.strip != strip_none)
784 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
787 link_info.strip = strip_some;
791 /* Callbacks from the BFD linker routines. */
793 /* This is called when BFD has decided to include an archive member in
797 add_archive_element (struct bfd_link_info *info,
800 bfd **subsbfd ATTRIBUTE_UNUSED)
802 lang_input_statement_type *input;
803 lang_input_statement_type *parent;
804 lang_input_statement_type orig_input;
806 input = (lang_input_statement_type *)
807 xcalloc (1, sizeof (lang_input_statement_type));
808 input->header.type = lang_input_statement_enum;
809 input->filename = abfd->filename;
810 input->local_sym_name = abfd->filename;
811 input->the_bfd = abfd;
813 parent = abfd->my_archive->usrdata;
814 if (parent != NULL && !parent->flags.reload)
815 parent->next = (lang_statement_union_type *) input;
817 /* Save the original data for trace files/tries below, as plugins
818 (if enabled) may possibly alter it to point to a replacement
819 BFD, but we still want to output the original BFD filename. */
821 #ifdef ENABLE_PLUGINS
822 if (link_info.lto_plugin_active)
824 /* We must offer this archive member to the plugins to claim. */
825 plugin_maybe_claim (input);
826 if (input->flags.claimed)
828 if (no_more_claiming)
830 /* Don't claim new IR symbols after all IR symbols have
832 if (trace_files || verbose)
833 info_msg ("%pI: no new IR symbols to claimi\n",
835 input->flags.claimed = 0;
838 input->flags.claim_archive = TRUE;
839 *subsbfd = input->the_bfd;
842 #endif /* ENABLE_PLUGINS */
844 ldlang_add_file (input);
846 if (config.map_file != NULL)
848 static bfd_boolean header_printed;
849 struct bfd_link_hash_entry *h;
853 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
865 case bfd_link_hash_defined:
866 case bfd_link_hash_defweak:
867 from = h->u.def.section->owner;
870 case bfd_link_hash_undefined:
871 case bfd_link_hash_undefweak:
872 from = h->u.undef.abfd;
875 case bfd_link_hash_common:
876 from = h->u.c.p->section->owner;
883 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
884 header_printed = TRUE;
887 if (abfd->my_archive == NULL
888 || bfd_is_thin_archive (abfd->my_archive))
890 minfo ("%s", bfd_get_filename (abfd));
891 len = strlen (bfd_get_filename (abfd));
895 minfo ("%s(%s)", bfd_get_filename (abfd->my_archive),
896 bfd_get_filename (abfd));
897 len = (strlen (bfd_get_filename (abfd->my_archive))
898 + strlen (bfd_get_filename (abfd))
914 minfo ("%pB ", from);
916 minfo ("(%pT)\n", h->root.string);
918 minfo ("(%s)\n", name);
921 if (trace_files || verbose)
922 info_msg ("%pI\n", &orig_input);
926 /* This is called when BFD has discovered a symbol which is defined
930 multiple_definition (struct bfd_link_info *info,
931 struct bfd_link_hash_entry *h,
941 if (info->allow_multiple_definition)
946 case bfd_link_hash_defined:
947 osec = h->u.def.section;
948 oval = h->u.def.value;
949 obfd = h->u.def.section->owner;
951 case bfd_link_hash_indirect:
952 osec = bfd_ind_section_ptr;
960 /* Ignore a redefinition of an absolute symbol to the
961 same value; it's harmless. */
962 if (h->type == bfd_link_hash_defined
963 && bfd_is_abs_section (osec)
964 && bfd_is_abs_section (nsec)
968 /* If either section has the output_section field set to
969 bfd_abs_section_ptr, it means that the section is being
970 discarded, and this is not really a multiple definition at all.
971 FIXME: It would be cleaner to somehow ignore symbols defined in
972 sections which are being discarded. */
973 if ((osec->output_section != NULL
974 && !bfd_is_abs_section (osec)
975 && bfd_is_abs_section (osec->output_section))
976 || (nsec->output_section != NULL
977 && !bfd_is_abs_section (nsec)
978 && bfd_is_abs_section (nsec->output_section)))
981 name = h->root.string;
989 einfo (_("%X%P: %C: multiple definition of `%pT'"),
990 nbfd, nsec, nval, name);
992 einfo (_("; %D: first defined here"), obfd, osec, oval);
995 if (RELAXATION_ENABLED_BY_USER)
997 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1002 /* This is called when there is a definition of a common symbol, or
1003 when a common symbol is found for a symbol that is already defined,
1004 or when two common symbols are found. We only do something if
1005 -warn-common was used. */
1008 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1009 struct bfd_link_hash_entry *h,
1011 enum bfd_link_hash_type ntype,
1016 enum bfd_link_hash_type otype;
1019 if (!config.warn_common)
1022 name = h->root.string;
1024 if (otype == bfd_link_hash_common)
1026 obfd = h->u.c.p->section->owner;
1027 osize = h->u.c.size;
1029 else if (otype == bfd_link_hash_defined
1030 || otype == bfd_link_hash_defweak)
1032 obfd = h->u.def.section->owner;
1037 /* FIXME: It would nice if we could report the BFD which defined
1038 an indirect symbol, but we don't have anywhere to store the
1044 if (ntype == bfd_link_hash_defined
1045 || ntype == bfd_link_hash_defweak
1046 || ntype == bfd_link_hash_indirect)
1048 ASSERT (otype == bfd_link_hash_common);
1050 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1054 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1057 else if (otype == bfd_link_hash_defined
1058 || otype == bfd_link_hash_defweak
1059 || otype == bfd_link_hash_indirect)
1061 ASSERT (ntype == bfd_link_hash_common);
1063 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1067 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1072 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1076 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1077 " by larger common from %pB\n"),
1080 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1081 " by larger common\n"),
1084 else if (nsize > osize)
1087 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1088 " smaller common from %pB\n"),
1091 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1092 " smaller common\n"),
1098 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1101 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1107 /* This is called when BFD has discovered a set element. H is the
1108 entry in the linker hash table for the set. SECTION and VALUE
1109 represent a value which should be added to the set. */
1112 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1113 struct bfd_link_hash_entry *h,
1114 bfd_reloc_code_real_type reloc,
1119 if (config.warn_constructors)
1120 einfo (_("%P: warning: global constructor %s used\n"),
1123 if (!config.build_constructors)
1126 ldctor_add_set_entry (h, reloc, NULL, section, value);
1128 if (h->type == bfd_link_hash_new)
1130 h->type = bfd_link_hash_undefined;
1131 h->u.undef.abfd = abfd;
1132 /* We don't call bfd_link_add_undef to add this to the list of
1133 undefined symbols because we are going to define it
1138 /* This is called when BFD has discovered a constructor. This is only
1139 called for some object file formats--those which do not handle
1140 constructors in some more clever fashion. This is similar to
1141 adding an element to a set, but less general. */
1144 constructor_callback (struct bfd_link_info *info,
1145 bfd_boolean constructor,
1152 struct bfd_link_hash_entry *h;
1153 char set_name[1 + sizeof "__CTOR_LIST__"];
1155 if (config.warn_constructors)
1156 einfo (_("%P: warning: global constructor %s used\n"), name);
1158 if (!config.build_constructors)
1161 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1162 useful error message. */
1163 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1164 && (bfd_link_relocatable (info)
1165 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1166 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1169 if (bfd_get_symbol_leading_char (abfd) != '\0')
1170 *s++ = bfd_get_symbol_leading_char (abfd);
1172 strcpy (s, "__CTOR_LIST__");
1174 strcpy (s, "__DTOR_LIST__");
1176 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1177 if (h == (struct bfd_link_hash_entry *) NULL)
1178 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1179 if (h->type == bfd_link_hash_new)
1181 h->type = bfd_link_hash_undefined;
1182 h->u.undef.abfd = abfd;
1183 /* We don't call bfd_link_add_undef to add this to the list of
1184 undefined symbols because we are going to define it
1188 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1191 /* A structure used by warning_callback to pass information through
1192 bfd_map_over_sections. */
1194 struct warning_callback_info
1197 const char *warning;
1202 /* Look through the relocs to see if we can find a plausible address
1203 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1206 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1208 struct warning_callback_info cinfo;
1210 if (!bfd_generic_link_read_symbols (abfd))
1211 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd);
1213 cinfo.found = FALSE;
1214 cinfo.warning = warning;
1215 cinfo.symbol = symbol;
1216 cinfo.asymbols = bfd_get_outsymbols (abfd);
1217 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1221 /* This is called when there is a reference to a warning symbol. */
1224 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1225 const char *warning,
1231 /* This is a hack to support warn_multiple_gp. FIXME: This should
1232 have a cleaner interface, but what? */
1233 if (!config.warn_multiple_gp
1234 && strcmp (warning, "using multiple gp values") == 0)
1237 if (section != NULL)
1238 einfo ("%P: %C: %s%s\n", abfd, section, address, _("warning: "), warning);
1239 else if (abfd == NULL)
1240 einfo ("%P: %s%s\n", _("warning: "), warning);
1241 else if (symbol == NULL)
1242 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1243 else if (!symbol_warning (warning, symbol, abfd))
1246 /* Search all input files for a reference to SYMBOL. */
1247 for (b = info->input_bfds; b; b = b->link.next)
1248 if (b != abfd && symbol_warning (warning, symbol, b))
1250 einfo ("%P: %pB: %s%s\n", abfd, _("warning: "), warning);
1254 /* This is called by warning_callback for each section. It checks the
1255 relocs of the section to see if it can find a reference to the
1256 symbol which triggered the warning. If it can, it uses the reloc
1257 to give an error message with a file and line number. */
1260 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1262 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1266 arelent **p, **pend;
1271 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1273 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1277 relpp = (arelent **) xmalloc (relsize);
1278 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1280 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd);
1283 pend = p + relcount;
1284 for (; p < pend && *p != NULL; p++)
1288 if (q->sym_ptr_ptr != NULL
1289 && *q->sym_ptr_ptr != NULL
1290 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1292 /* We found a reloc for the symbol we are looking for. */
1293 einfo ("%P: %C: %s%s\n", abfd, sec, q->address, _("warning: "),
1303 /* This is called when an undefined symbol is found. */
1306 undefined_symbol (struct bfd_link_info *info,
1313 static char *error_name;
1314 static unsigned int error_count;
1316 #define MAX_ERRORS_IN_A_ROW 5
1318 if (info->ignore_hash != NULL
1319 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1322 if (config.warn_once)
1324 /* Only warn once about a particular undefined symbol. */
1325 add_ignoresym (info, name);
1328 /* We never print more than a reasonable number of errors in a row
1329 for a single symbol. */
1330 if (error_name != NULL
1331 && strcmp (name, error_name) == 0)
1336 if (error_name != NULL)
1338 error_name = xstrdup (name);
1341 if (section != NULL)
1343 if (error_count < MAX_ERRORS_IN_A_ROW)
1346 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1347 abfd, section, address, name);
1349 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1350 abfd, section, address, name);
1352 else if (error_count == MAX_ERRORS_IN_A_ROW)
1355 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1356 abfd, section, address, name);
1358 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1359 abfd, section, address, name);
1366 if (error_count < MAX_ERRORS_IN_A_ROW)
1369 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1372 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1375 else if (error_count == MAX_ERRORS_IN_A_ROW)
1378 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1381 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1389 /* Counter to limit the number of relocation overflow error messages
1390 to print. Errors are printed as it is decremented. When it's
1391 called and the counter is zero, a final message is printed
1392 indicating more relocations were omitted. When it gets to -1, no
1393 such errors are printed. If it's initially set to a value less
1394 than -1, all such errors will be printed (--verbose does this). */
1396 int overflow_cutoff_limit = 10;
1398 /* This is called when a reloc overflows. */
1401 reloc_overflow (struct bfd_link_info *info,
1402 struct bfd_link_hash_entry *entry,
1404 const char *reloc_name,
1410 if (overflow_cutoff_limit == -1)
1413 einfo ("%X%P: %H:", abfd, section, address);
1415 if (overflow_cutoff_limit >= 0
1416 && overflow_cutoff_limit-- == 0)
1418 einfo (_(" additional relocation overflows omitted from the output\n"));
1424 while (entry->type == bfd_link_hash_indirect
1425 || entry->type == bfd_link_hash_warning)
1426 entry = entry->u.i.link;
1427 switch (entry->type)
1429 case bfd_link_hash_undefined:
1430 case bfd_link_hash_undefweak:
1431 einfo (_(" relocation truncated to fit: "
1432 "%s against undefined symbol `%pT'"),
1433 reloc_name, entry->root.string);
1435 case bfd_link_hash_defined:
1436 case bfd_link_hash_defweak:
1437 einfo (_(" relocation truncated to fit: "
1438 "%s against symbol `%pT' defined in %pA section in %pB"),
1439 reloc_name, entry->root.string,
1440 entry->u.def.section,
1441 entry->u.def.section == bfd_abs_section_ptr
1442 ? info->output_bfd : entry->u.def.section->owner);
1450 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1453 einfo ("+%v", addend);
1457 /* This is called when a dangerous relocation is made. */
1460 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1461 const char *message,
1466 einfo (_("%X%P: %H: dangerous relocation: %s\n"),
1467 abfd, section, address, message);
1470 /* This is called when a reloc is being generated attached to a symbol
1471 that is not being output. */
1474 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1480 einfo (_("%X%P: %H: reloc refers to symbol `%pT' which is not being output\n"),
1481 abfd, section, address, name);
1484 /* This is called if link_info.notice_all is set, or when a symbol in
1485 link_info.notice_hash is found. Symbols are put in notice_hash
1486 using the -y option, while notice_all is set if the --cref option
1487 has been supplied, or if there are any NOCROSSREFS sections in the
1488 linker script; and if plugins are active, since they need to monitor
1489 all references from non-IR files. */
1492 notice (struct bfd_link_info *info,
1493 struct bfd_link_hash_entry *h,
1494 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1498 flagword flags ATTRIBUTE_UNUSED)
1504 if (command_line.cref || nocrossref_list != NULL)
1505 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1509 name = h->root.string;
1510 if (info->notice_hash != NULL
1511 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1513 if (bfd_is_und_section (section))
1514 einfo (_("%P: %pB: reference to %s\n"), abfd, name);
1516 einfo (_("%P: %pB: definition of %s\n"), abfd, name);
1519 if (command_line.cref || nocrossref_list != NULL)
1520 add_cref (name, abfd, section, value);