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"
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 struct bfd_link_hash_entry *, bfd *, asection *, bfd_vma, flagword);
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);
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;
430 if (config.map_file != NULL)
432 if (command_line.cref)
433 output_cref (config.map_file != NULL ? config.map_file : stdout);
434 if (nocrossref_list != NULL)
435 check_nocrossrefs ();
438 struct bfd_link_hash_entry * h;
440 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
441 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
447 /* Even if we're producing relocatable output, some non-fatal errors should
448 be reported in the exit status. (What non-fatal errors, if any, do we
449 want to ignore for relocatable output?) */
450 if (!config.make_executable && !force_make_executable)
453 einfo (_("%P: link errors found, deleting executable `%s'\n"),
456 /* The file will be removed by ld_cleanup. */
461 if (! bfd_close (link_info.output_bfd))
462 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
464 /* If the --force-exe-suffix is enabled, and we're making an
465 executable file and it doesn't end in .exe, copy it to one
467 if (! link_info.relocatable && command_line.force_exe_suffix)
469 int len = strlen (output_filename);
472 || (strcasecmp (output_filename + len - 4, ".exe") != 0
473 && strcasecmp (output_filename + len - 4, ".dll") != 0))
477 const int bsize = 4096;
478 char *buf = (char *) xmalloc (bsize);
480 char *dst_name = (char *) xmalloc (len + 5);
482 strcpy (dst_name, output_filename);
483 strcat (dst_name, ".exe");
484 src = fopen (output_filename, FOPEN_RB);
485 dst = fopen (dst_name, FOPEN_WB);
488 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
491 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
493 while ((l = fread (buf, 1, bsize, src)) > 0)
495 int done = fwrite (buf, 1, l, dst);
498 einfo (_("%P: Error writing file `%s'\n"), dst_name);
502 if (fclose (dst) == EOF)
503 einfo (_("%P: Error closing file `%s'\n"), dst_name);
510 END_PROGRESS (program_name);
515 char *lim = (char *) sbrk (0);
517 long run_time = get_run_time () - start_time;
520 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
521 program_name, run_time / 1000000, run_time % 1000000);
523 fprintf (stderr, _("%s: data size %ld\n"), program_name,
524 (long) (lim - start_sbrk));
529 /* Prevent ld_cleanup from doing anything, after a successful link. */
530 output_filename = NULL;
536 /* If the configured sysroot is relocatable, try relocating it based on
537 default prefix FROM. Return the relocated directory if it exists,
538 otherwise return null. */
541 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
543 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
547 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
550 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
558 /* Return the sysroot directory. Return "" if no sysroot is being used. */
561 get_sysroot (int argc, char **argv)
566 for (i = 1; i < argc; i++)
567 if (CONST_STRNEQ (argv[i], "--sysroot="))
568 return argv[i] + strlen ("--sysroot=");
570 path = get_relative_sysroot (BINDIR);
574 path = get_relative_sysroot (TOOLBINDIR);
578 return TARGET_SYSTEM_ROOT;
581 /* We need to find any explicitly given emulation in order to initialize the
582 state that's needed by the lex&yacc argument parser (parse_args). */
585 get_emulation (int argc, char **argv)
590 emulation = getenv (EMULATION_ENVIRON);
591 if (emulation == NULL)
592 emulation = DEFAULT_EMULATION;
594 for (i = 1; i < argc; i++)
596 if (CONST_STRNEQ (argv[i], "-m"))
598 if (argv[i][2] == '\0')
603 emulation = argv[i + 1];
607 einfo (_("%P%F: missing argument to -m\n"));
609 else if (strcmp (argv[i], "-mips1") == 0
610 || strcmp (argv[i], "-mips2") == 0
611 || strcmp (argv[i], "-mips3") == 0
612 || strcmp (argv[i], "-mips4") == 0
613 || strcmp (argv[i], "-mips5") == 0
614 || strcmp (argv[i], "-mips32") == 0
615 || strcmp (argv[i], "-mips32r2") == 0
616 || strcmp (argv[i], "-mips32r6") == 0
617 || strcmp (argv[i], "-mips64") == 0
618 || strcmp (argv[i], "-mips64r2") == 0
619 || strcmp (argv[i], "-mips64r6") == 0)
621 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
622 passed to the linker by some MIPS compilers. They
623 generally tell the linker to use a slightly different
624 library path. Perhaps someday these should be
625 implemented as emulations; until then, we just ignore
626 the arguments and hope that nobody ever creates
627 emulations named ips1, ips2 or ips3. */
629 else if (strcmp (argv[i], "-m486") == 0)
631 /* FIXME: The argument -m486 is passed to the linker on
632 some Linux systems. Hope that nobody creates an
633 emulation named 486. */
638 emulation = &argv[i][2];
647 add_ysym (const char *name)
649 if (link_info.notice_hash == NULL)
651 link_info.notice_hash =
652 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
653 if (!bfd_hash_table_init_n (link_info.notice_hash,
655 sizeof (struct bfd_hash_entry),
657 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
660 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
661 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
665 add_ignoresym (struct bfd_link_info *info, const char *name)
667 if (info->ignore_hash == NULL)
669 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
670 if (! bfd_hash_table_init_n (info->ignore_hash,
672 sizeof (struct bfd_hash_entry),
674 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
677 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
678 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
681 /* Record a symbol to be wrapped, from the --wrap option. */
684 add_wrap (const char *name)
686 if (link_info.wrap_hash == NULL)
688 link_info.wrap_hash =
689 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
690 if (!bfd_hash_table_init_n (link_info.wrap_hash,
692 sizeof (struct bfd_hash_entry),
694 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
697 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
698 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
701 /* Handle the -retain-symbols-file option. */
704 add_keepsyms_file (const char *filename)
711 if (link_info.strip == strip_some)
712 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
714 file = fopen (filename, "r");
717 bfd_set_error (bfd_error_system_call);
718 einfo ("%X%P: %s: %E\n", filename);
722 link_info.keep_hash = (struct bfd_hash_table *)
723 xmalloc (sizeof (struct bfd_hash_table));
724 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
725 sizeof (struct bfd_hash_entry)))
726 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
729 buf = (char *) xmalloc (bufsize);
741 while (! ISSPACE (c) && c != EOF)
748 buf = (char *) xrealloc (buf, bufsize);
755 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
756 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
760 if (link_info.strip != strip_none)
761 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
764 link_info.strip = strip_some;
768 /* Callbacks from the BFD linker routines. */
770 /* This is called when BFD has decided to include an archive member in
774 add_archive_element (struct bfd_link_info *info,
777 bfd **subsbfd ATTRIBUTE_UNUSED)
779 lang_input_statement_type *input;
780 lang_input_statement_type orig_input;
782 input = (lang_input_statement_type *)
783 xcalloc (1, sizeof (lang_input_statement_type));
784 input->filename = abfd->filename;
785 input->local_sym_name = abfd->filename;
786 input->the_bfd = abfd;
788 /* Save the original data for trace files/tries below, as plugins
789 (if enabled) may possibly alter it to point to a replacement
790 BFD, but we still want to output the original BFD filename. */
792 #ifdef ENABLE_PLUGINS
793 if (link_info.lto_plugin_active && !no_more_claiming)
795 /* We must offer this archive member to the plugins to claim. */
796 const char *filename = (bfd_my_archive (abfd) != NULL
797 ? bfd_my_archive (abfd)->filename : abfd->filename);
798 int fd = open (filename, O_RDONLY | O_BINARY);
801 struct ld_plugin_input_file file;
803 /* Offset and filesize must refer to the individual archive
804 member, not the whole file, and must exclude the header.
805 Fortunately for us, that is how the data is stored in the
806 origin field of the bfd and in the arelt_data. */
807 file.name = filename;
808 file.offset = abfd->origin;
809 file.filesize = arelt_size (abfd);
811 plugin_maybe_claim (&file, input);
812 if (input->flags.claimed)
814 input->flags.claim_archive = TRUE;
815 *subsbfd = input->the_bfd;
819 #endif /* ENABLE_PLUGINS */
821 ldlang_add_file (input);
823 if (config.map_file != NULL)
825 static bfd_boolean header_printed;
826 struct bfd_link_hash_entry *h;
830 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
842 case bfd_link_hash_defined:
843 case bfd_link_hash_defweak:
844 from = h->u.def.section->owner;
847 case bfd_link_hash_undefined:
848 case bfd_link_hash_undefweak:
849 from = h->u.undef.abfd;
852 case bfd_link_hash_common:
853 from = h->u.c.p->section->owner;
858 if (! header_printed)
862 sprintf (buf, _("Archive member included "
863 "to satisfy reference by file (symbol)\n\n"));
865 header_printed = TRUE;
868 if (bfd_my_archive (abfd) == NULL)
870 minfo ("%s", bfd_get_filename (abfd));
871 len = strlen (bfd_get_filename (abfd));
875 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
876 bfd_get_filename (abfd));
877 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
878 + strlen (bfd_get_filename (abfd))
896 minfo ("(%T)\n", h->root.string);
898 minfo ("(%s)\n", name);
901 if (trace_files || verbose)
902 info_msg ("%I\n", &orig_input);
906 /* This is called when BFD has discovered a symbol which is defined
910 multiple_definition (struct bfd_link_info *info,
911 struct bfd_link_hash_entry *h,
921 if (info->allow_multiple_definition)
926 case bfd_link_hash_defined:
927 osec = h->u.def.section;
928 oval = h->u.def.value;
929 obfd = h->u.def.section->owner;
931 case bfd_link_hash_indirect:
932 osec = bfd_ind_section_ptr;
940 /* Ignore a redefinition of an absolute symbol to the
941 same value; it's harmless. */
942 if (h->type == bfd_link_hash_defined
943 && bfd_is_abs_section (osec)
944 && bfd_is_abs_section (nsec)
948 /* If either section has the output_section field set to
949 bfd_abs_section_ptr, it means that the section is being
950 discarded, and this is not really a multiple definition at all.
951 FIXME: It would be cleaner to somehow ignore symbols defined in
952 sections which are being discarded. */
953 if ((osec->output_section != NULL
954 && ! bfd_is_abs_section (osec)
955 && bfd_is_abs_section (osec->output_section))
956 || (nsec->output_section != NULL
957 && ! bfd_is_abs_section (nsec)
958 && bfd_is_abs_section (nsec->output_section)))
961 name = h->root.string;
969 einfo (_("%X%C: multiple definition of `%T'\n"),
970 nbfd, nsec, nval, name);
972 einfo (_("%D: first defined here\n"), obfd, osec, oval);
974 if (RELAXATION_ENABLED_BY_USER)
976 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
983 /* This is called when there is a definition of a common symbol, or
984 when a common symbol is found for a symbol that is already defined,
985 or when two common symbols are found. We only do something if
986 -warn-common was used. */
989 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
990 struct bfd_link_hash_entry *h,
992 enum bfd_link_hash_type ntype,
997 enum bfd_link_hash_type otype;
1000 if (!config.warn_common)
1003 name = h->root.string;
1005 if (otype == bfd_link_hash_common)
1007 obfd = h->u.c.p->section->owner;
1008 osize = h->u.c.size;
1010 else if (otype == bfd_link_hash_defined
1011 || otype == bfd_link_hash_defweak)
1013 obfd = h->u.def.section->owner;
1018 /* FIXME: It would nice if we could report the BFD which defined
1019 an indirect symbol, but we don't have anywhere to store the
1025 if (ntype == bfd_link_hash_defined
1026 || ntype == bfd_link_hash_defweak
1027 || ntype == bfd_link_hash_indirect)
1029 ASSERT (otype == bfd_link_hash_common);
1030 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1033 einfo (_("%B: warning: common is here\n"), obfd);
1035 else if (otype == bfd_link_hash_defined
1036 || otype == bfd_link_hash_defweak
1037 || otype == bfd_link_hash_indirect)
1039 ASSERT (ntype == bfd_link_hash_common);
1040 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1043 einfo (_("%B: warning: defined here\n"), obfd);
1047 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1050 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1053 einfo (_("%B: warning: larger common is here\n"), obfd);
1055 else if (nsize > osize)
1057 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1060 einfo (_("%B: warning: smaller common is here\n"), obfd);
1064 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1066 einfo (_("%B: warning: previous common is here\n"), obfd);
1073 /* This is called when BFD has discovered a set element. H is the
1074 entry in the linker hash table for the set. SECTION and VALUE
1075 represent a value which should be added to the set. */
1078 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1079 struct bfd_link_hash_entry *h,
1080 bfd_reloc_code_real_type reloc,
1085 if (config.warn_constructors)
1086 einfo (_("%P: warning: global constructor %s used\n"),
1089 if (! config.build_constructors)
1092 ldctor_add_set_entry (h, reloc, NULL, section, value);
1094 if (h->type == bfd_link_hash_new)
1096 h->type = bfd_link_hash_undefined;
1097 h->u.undef.abfd = abfd;
1098 /* We don't call bfd_link_add_undef to add this to the list of
1099 undefined symbols because we are going to define it
1106 /* This is called when BFD has discovered a constructor. This is only
1107 called for some object file formats--those which do not handle
1108 constructors in some more clever fashion. This is similar to
1109 adding an element to a set, but less general. */
1112 constructor_callback (struct bfd_link_info *info,
1113 bfd_boolean constructor,
1120 struct bfd_link_hash_entry *h;
1121 char set_name[1 + sizeof "__CTOR_LIST__"];
1123 if (config.warn_constructors)
1124 einfo (_("%P: warning: global constructor %s used\n"), name);
1126 if (! config.build_constructors)
1129 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1130 useful error message. */
1131 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1132 && (info->relocatable
1133 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1134 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1137 if (bfd_get_symbol_leading_char (abfd) != '\0')
1138 *s++ = bfd_get_symbol_leading_char (abfd);
1140 strcpy (s, "__CTOR_LIST__");
1142 strcpy (s, "__DTOR_LIST__");
1144 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1145 if (h == (struct bfd_link_hash_entry *) NULL)
1146 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1147 if (h->type == bfd_link_hash_new)
1149 h->type = bfd_link_hash_undefined;
1150 h->u.undef.abfd = abfd;
1151 /* We don't call bfd_link_add_undef to add this to the list of
1152 undefined symbols because we are going to define it
1156 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1160 /* A structure used by warning_callback to pass information through
1161 bfd_map_over_sections. */
1163 struct warning_callback_info
1166 const char *warning;
1171 /* Look through the relocs to see if we can find a plausible address
1172 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1175 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1177 struct warning_callback_info cinfo;
1179 if (!bfd_generic_link_read_symbols (abfd))
1180 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1182 cinfo.found = FALSE;
1183 cinfo.warning = warning;
1184 cinfo.symbol = symbol;
1185 cinfo.asymbols = bfd_get_outsymbols (abfd);
1186 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1190 /* This is called when there is a reference to a warning symbol. */
1193 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1194 const char *warning,
1200 /* This is a hack to support warn_multiple_gp. FIXME: This should
1201 have a cleaner interface, but what? */
1202 if (! config.warn_multiple_gp
1203 && strcmp (warning, "using multiple gp values") == 0)
1206 if (section != NULL)
1207 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1208 else if (abfd == NULL)
1209 einfo ("%P: %s%s\n", _("warning: "), warning);
1210 else if (symbol == NULL)
1211 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1212 else if (! symbol_warning (warning, symbol, abfd))
1215 /* Search all input files for a reference to SYMBOL. */
1216 for (b = info->input_bfds; b; b = b->link.next)
1217 if (b != abfd && symbol_warning (warning, symbol, b))
1219 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1225 /* This is called by warning_callback for each section. It checks the
1226 relocs of the section to see if it can find a reference to the
1227 symbol which triggered the warning. If it can, it uses the reloc
1228 to give an error message with a file and line number. */
1231 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1233 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1237 arelent **p, **pend;
1242 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1244 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1248 relpp = (arelent **) xmalloc (relsize);
1249 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1251 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1254 pend = p + relcount;
1255 for (; p < pend && *p != NULL; p++)
1259 if (q->sym_ptr_ptr != NULL
1260 && *q->sym_ptr_ptr != NULL
1261 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1263 /* We found a reloc for the symbol we are looking for. */
1264 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1274 /* This is called when an undefined symbol is found. */
1277 undefined_symbol (struct bfd_link_info *info,
1284 static char *error_name;
1285 static unsigned int error_count;
1287 #define MAX_ERRORS_IN_A_ROW 5
1289 if (info->ignore_hash != NULL
1290 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1293 if (config.warn_once)
1295 /* Only warn once about a particular undefined symbol. */
1296 add_ignoresym (info, name);
1299 /* We never print more than a reasonable number of errors in a row
1300 for a single symbol. */
1301 if (error_name != NULL
1302 && strcmp (name, error_name) == 0)
1307 if (error_name != NULL)
1309 error_name = xstrdup (name);
1312 if (section != NULL)
1314 if (error_count < MAX_ERRORS_IN_A_ROW)
1317 einfo (_("%X%C: undefined reference to `%T'\n"),
1318 abfd, section, address, name);
1320 einfo (_("%C: warning: undefined reference to `%T'\n"),
1321 abfd, section, address, name);
1323 else if (error_count == MAX_ERRORS_IN_A_ROW)
1326 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1327 abfd, section, address, name);
1329 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1330 abfd, section, address, name);
1337 if (error_count < MAX_ERRORS_IN_A_ROW)
1340 einfo (_("%X%B: undefined reference to `%T'\n"),
1343 einfo (_("%B: warning: undefined reference to `%T'\n"),
1346 else if (error_count == MAX_ERRORS_IN_A_ROW)
1349 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1352 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1362 /* Counter to limit the number of relocation overflow error messages
1363 to print. Errors are printed as it is decremented. When it's
1364 called and the counter is zero, a final message is printed
1365 indicating more relocations were omitted. When it gets to -1, no
1366 such errors are printed. If it's initially set to a value less
1367 than -1, all such errors will be printed (--verbose does this). */
1369 int overflow_cutoff_limit = 10;
1371 /* This is called when a reloc overflows. */
1374 reloc_overflow (struct bfd_link_info *info,
1375 struct bfd_link_hash_entry *entry,
1377 const char *reloc_name,
1383 if (overflow_cutoff_limit == -1)
1386 einfo ("%X%H:", abfd, section, address);
1388 if (overflow_cutoff_limit >= 0
1389 && overflow_cutoff_limit-- == 0)
1391 einfo (_(" additional relocation overflows omitted from the output\n"));
1397 while (entry->type == bfd_link_hash_indirect
1398 || entry->type == bfd_link_hash_warning)
1399 entry = entry->u.i.link;
1400 switch (entry->type)
1402 case bfd_link_hash_undefined:
1403 case bfd_link_hash_undefweak:
1404 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1405 reloc_name, entry->root.string);
1407 case bfd_link_hash_defined:
1408 case bfd_link_hash_defweak:
1409 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1410 reloc_name, entry->root.string,
1411 entry->u.def.section,
1412 entry->u.def.section == bfd_abs_section_ptr
1413 ? info->output_bfd : entry->u.def.section->owner);
1421 einfo (_(" relocation truncated to fit: %s against `%T'"),
1424 einfo ("+%v", addend);
1429 /* This is called when a dangerous relocation is made. */
1432 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1433 const char *message,
1438 einfo (_("%X%H: dangerous relocation: %s\n"),
1439 abfd, section, address, message);
1443 /* This is called when a reloc is being generated attached to a symbol
1444 that is not being output. */
1447 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1453 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1454 abfd, section, address, name);
1458 /* This is called if link_info.notice_all is set, or when a symbol in
1459 link_info.notice_hash is found. Symbols are put in notice_hash
1460 using the -y option, while notice_all is set if the --cref option
1461 has been supplied, or if there are any NOCROSSREFS sections in the
1462 linker script; and if plugins are active, since they need to monitor
1463 all references from non-IR files. */
1466 notice (struct bfd_link_info *info,
1467 struct bfd_link_hash_entry *h,
1468 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1472 flagword flags ATTRIBUTE_UNUSED)
1478 if (command_line.cref || nocrossref_list != NULL)
1479 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1483 name = h->root.string;
1484 if (info->notice_hash != NULL
1485 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1487 if (bfd_is_und_section (section))
1488 einfo ("%B: reference to %s\n", abfd, name);
1490 einfo ("%B: definition of %s\n", abfd, name);
1493 if (command_line.cref || nocrossref_list != NULL)
1494 add_cref (name, abfd, section, value);