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);
225 ld_canon_sysroot = lrealpath (ld_sysroot);
226 if (ld_canon_sysroot)
227 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
229 ld_canon_sysroot_len = -1;
231 /* Set the default BFD target based on the configured target. Doing
232 this permits the linker to be configured for a particular target,
233 and linked against a shared BFD library which was configured for
234 a different target. The macro TARGET is defined by Makefile. */
235 if (! bfd_set_default_target (TARGET))
237 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
248 config.build_constructors = TRUE;
249 config.rpath_separator = ':';
250 config.split_by_reloc = (unsigned) -1;
251 config.split_by_file = (bfd_size_type) -1;
252 config.make_executable = TRUE;
253 config.magic_demand_paged = TRUE;
254 config.text_read_only = TRUE;
255 link_info.disable_target_specific_optimizations = -1;
257 command_line.warn_mismatch = TRUE;
258 command_line.warn_search_mismatch = TRUE;
259 command_line.check_section_addresses = -1;
261 /* We initialize DEMANGLING based on the environment variable
262 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
263 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
264 environment. Acting the same way here lets us provide the same
265 interface by default. */
266 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
268 link_info.allow_undefined_version = TRUE;
269 link_info.keep_memory = TRUE;
270 link_info.combreloc = TRUE;
271 link_info.strip_discarded = TRUE;
272 link_info.emit_hash = TRUE;
273 link_info.callbacks = &link_callbacks;
274 link_info.input_bfds_tail = &link_info.input_bfds;
275 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
276 and _fini symbols. We are compatible. */
277 link_info.init_function = "_init";
278 link_info.fini_function = "_fini";
279 link_info.relax_pass = 1;
280 link_info.extern_protected_data = -1;
281 link_info.pei386_auto_import = -1;
282 link_info.spare_dynamic_tags = 5;
283 link_info.path_separator = ':';
285 ldfile_add_arch ("");
286 emulation = get_emulation (argc, argv);
287 ldemul_choose_mode (emulation);
288 default_target = ldemul_choose_target (argc, argv);
289 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
290 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
293 ldemul_before_parse ();
294 lang_has_input_file = FALSE;
295 parse_args (argc, argv);
297 if (config.hash_table_size != 0)
298 bfd_hash_set_default_size (config.hash_table_size);
300 #ifdef ENABLE_PLUGINS
301 /* Now all the plugin arguments have been gathered, we can load them. */
302 plugin_load_plugins ();
303 #endif /* ENABLE_PLUGINS */
305 ldemul_set_symbols ();
307 /* If we have not already opened and parsed a linker script,
308 try the default script from command line first. */
309 if (saved_script_handle == NULL
310 && command_line.default_script != NULL)
312 ldfile_open_command_file (command_line.default_script);
313 parser_input = input_script;
317 /* If we have not already opened and parsed a linker script
318 read the emulation's appropriate default script. */
319 if (saved_script_handle == NULL)
322 char *s = ldemul_get_script (&isfile);
325 ldfile_open_default_command_file (s);
329 lex_redirect (s, _("built in linker script"), 1);
331 parser_input = input_script;
338 if (saved_script_handle)
339 info_msg (_("using external linker script:"));
341 info_msg (_("using internal linker script:"));
342 info_msg ("\n==================================================\n");
344 if (saved_script_handle)
346 static const int ld_bufsz = 8193;
348 char *buf = (char *) xmalloc (ld_bufsz);
350 rewind (saved_script_handle);
351 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
356 rewind (saved_script_handle);
363 info_msg (ldemul_get_script (&isfile));
366 info_msg ("\n==================================================\n");
369 if (command_line.print_output_format)
370 info_msg ("%s\n", lang_get_output_target ());
374 /* If the only command line argument has been -v or --version or --verbose
375 then ignore any input files provided by linker scripts and exit now.
376 We do not want to create an output file when the linker is just invoked
377 to provide version information. */
378 if (argc == 2 && version_printed)
381 if (!lang_has_input_file)
383 if (version_printed || command_line.print_output_format)
385 einfo (_("%P%F: no input files\n"));
389 info_msg (_("%P: mode %s\n"), emulation);
391 ldemul_after_parse ();
393 if (config.map_filename)
395 if (strcmp (config.map_filename, "-") == 0)
397 config.map_file = stdout;
401 config.map_file = fopen (config.map_filename, FOPEN_WT);
402 if (config.map_file == (FILE *) NULL)
404 bfd_set_error (bfd_error_system_call);
405 einfo (_("%P%F: cannot open map file %s: %E\n"),
406 config.map_filename);
413 /* Print error messages for any missing symbols, for any warning
414 symbols, and possibly multiple definitions. */
415 if (bfd_link_relocatable (&link_info))
416 link_info.output_bfd->flags &= ~EXEC_P;
418 link_info.output_bfd->flags |= EXEC_P;
420 if ((link_info.compress_debug & COMPRESS_DEBUG))
422 link_info.output_bfd->flags |= BFD_COMPRESS;
423 if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
424 link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
429 if (config.map_file != NULL)
431 if (command_line.cref)
432 output_cref (config.map_file != NULL ? config.map_file : stdout);
433 if (nocrossref_list != NULL)
434 check_nocrossrefs ();
435 if (command_line.print_memory_usage)
436 lang_print_memory_usage ();
439 struct bfd_link_hash_entry * h;
441 h = bfd_link_hash_lookup (link_info.hash, "__image_base__", 0,0,1);
442 fprintf (stderr, "lookup = %p val %lx\n", h, h ? h->u.def.value : 1);
448 /* Even if we're producing relocatable output, some non-fatal errors should
449 be reported in the exit status. (What non-fatal errors, if any, do we
450 want to ignore for relocatable output?) */
451 if (!config.make_executable && !force_make_executable)
454 einfo (_("%P: link errors found, deleting executable `%s'\n"),
457 /* The file will be removed by ld_cleanup. */
462 if (! bfd_close (link_info.output_bfd))
463 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
465 /* If the --force-exe-suffix is enabled, and we're making an
466 executable file and it doesn't end in .exe, copy it to one
468 if (!bfd_link_relocatable (&link_info)
469 && command_line.force_exe_suffix)
471 int len = strlen (output_filename);
474 || (strcasecmp (output_filename + len - 4, ".exe") != 0
475 && strcasecmp (output_filename + len - 4, ".dll") != 0))
479 const int bsize = 4096;
480 char *buf = (char *) xmalloc (bsize);
482 char *dst_name = (char *) xmalloc (len + 5);
484 strcpy (dst_name, output_filename);
485 strcat (dst_name, ".exe");
486 src = fopen (output_filename, FOPEN_RB);
487 dst = fopen (dst_name, FOPEN_WB);
490 einfo (_("%P%F: unable to open for source of copy `%s'\n"),
493 einfo (_("%P%F: unable to open for destination of copy `%s'\n"),
495 while ((l = fread (buf, 1, bsize, src)) > 0)
497 int done = fwrite (buf, 1, l, dst);
500 einfo (_("%P: Error writing file `%s'\n"), dst_name);
504 if (fclose (dst) == EOF)
505 einfo (_("%P: Error closing file `%s'\n"), dst_name);
512 END_PROGRESS (program_name);
517 char *lim = (char *) sbrk (0);
519 long run_time = get_run_time () - start_time;
522 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
523 program_name, run_time / 1000000, run_time % 1000000);
525 fprintf (stderr, _("%s: data size %ld\n"), program_name,
526 (long) (lim - start_sbrk));
531 /* Prevent ld_cleanup from doing anything, after a successful link. */
532 output_filename = NULL;
538 /* If the configured sysroot is relocatable, try relocating it based on
539 default prefix FROM. Return the relocated directory if it exists,
540 otherwise return null. */
543 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
545 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
549 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
552 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
560 /* Return the sysroot directory. Return "" if no sysroot is being used. */
563 get_sysroot (int argc, char **argv)
568 for (i = 1; i < argc; i++)
569 if (CONST_STRNEQ (argv[i], "--sysroot="))
570 return argv[i] + strlen ("--sysroot=");
572 path = get_relative_sysroot (BINDIR);
576 path = get_relative_sysroot (TOOLBINDIR);
580 return TARGET_SYSTEM_ROOT;
583 /* We need to find any explicitly given emulation in order to initialize the
584 state that's needed by the lex&yacc argument parser (parse_args). */
587 get_emulation (int argc, char **argv)
592 emulation = getenv (EMULATION_ENVIRON);
593 if (emulation == NULL)
594 emulation = DEFAULT_EMULATION;
596 for (i = 1; i < argc; i++)
598 if (CONST_STRNEQ (argv[i], "-m"))
600 if (argv[i][2] == '\0')
605 emulation = argv[i + 1];
609 einfo (_("%P%F: missing argument to -m\n"));
611 else if (strcmp (argv[i], "-mips1") == 0
612 || strcmp (argv[i], "-mips2") == 0
613 || strcmp (argv[i], "-mips3") == 0
614 || strcmp (argv[i], "-mips4") == 0
615 || strcmp (argv[i], "-mips5") == 0
616 || strcmp (argv[i], "-mips32") == 0
617 || strcmp (argv[i], "-mips32r2") == 0
618 || strcmp (argv[i], "-mips32r6") == 0
619 || strcmp (argv[i], "-mips64") == 0
620 || strcmp (argv[i], "-mips64r2") == 0
621 || strcmp (argv[i], "-mips64r6") == 0)
623 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
624 passed to the linker by some MIPS compilers. They
625 generally tell the linker to use a slightly different
626 library path. Perhaps someday these should be
627 implemented as emulations; until then, we just ignore
628 the arguments and hope that nobody ever creates
629 emulations named ips1, ips2 or ips3. */
631 else if (strcmp (argv[i], "-m486") == 0)
633 /* FIXME: The argument -m486 is passed to the linker on
634 some Linux systems. Hope that nobody creates an
635 emulation named 486. */
640 emulation = &argv[i][2];
649 add_ysym (const char *name)
651 if (link_info.notice_hash == NULL)
653 link_info.notice_hash =
654 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
655 if (!bfd_hash_table_init_n (link_info.notice_hash,
657 sizeof (struct bfd_hash_entry),
659 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
662 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
663 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
667 add_ignoresym (struct bfd_link_info *info, const char *name)
669 if (info->ignore_hash == NULL)
671 info->ignore_hash = xmalloc (sizeof (struct bfd_hash_table));
672 if (! bfd_hash_table_init_n (info->ignore_hash,
674 sizeof (struct bfd_hash_entry),
676 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
679 if (bfd_hash_lookup (info->ignore_hash, name, TRUE, TRUE) == NULL)
680 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
683 /* Record a symbol to be wrapped, from the --wrap option. */
686 add_wrap (const char *name)
688 if (link_info.wrap_hash == NULL)
690 link_info.wrap_hash =
691 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
692 if (!bfd_hash_table_init_n (link_info.wrap_hash,
694 sizeof (struct bfd_hash_entry),
696 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
699 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
700 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
703 /* Handle the -retain-symbols-file option. */
706 add_keepsyms_file (const char *filename)
713 if (link_info.strip == strip_some)
714 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
716 file = fopen (filename, "r");
719 bfd_set_error (bfd_error_system_call);
720 einfo ("%X%P: %s: %E\n", filename);
724 link_info.keep_hash = (struct bfd_hash_table *)
725 xmalloc (sizeof (struct bfd_hash_table));
726 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
727 sizeof (struct bfd_hash_entry)))
728 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
731 buf = (char *) xmalloc (bufsize);
743 while (! ISSPACE (c) && c != EOF)
750 buf = (char *) xrealloc (buf, bufsize);
757 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
758 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
762 if (link_info.strip != strip_none)
763 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
766 link_info.strip = strip_some;
770 /* Callbacks from the BFD linker routines. */
772 /* This is called when BFD has decided to include an archive member in
776 add_archive_element (struct bfd_link_info *info,
779 bfd **subsbfd ATTRIBUTE_UNUSED)
781 lang_input_statement_type *input;
782 lang_input_statement_type orig_input;
784 input = (lang_input_statement_type *)
785 xcalloc (1, sizeof (lang_input_statement_type));
786 input->filename = abfd->filename;
787 input->local_sym_name = abfd->filename;
788 input->the_bfd = abfd;
790 /* Save the original data for trace files/tries below, as plugins
791 (if enabled) may possibly alter it to point to a replacement
792 BFD, but we still want to output the original BFD filename. */
794 #ifdef ENABLE_PLUGINS
795 if (link_info.lto_plugin_active && !no_more_claiming)
797 /* We must offer this archive member to the plugins to claim. */
798 plugin_maybe_claim (input);
799 if (input->flags.claimed)
801 input->flags.claim_archive = TRUE;
802 *subsbfd = input->the_bfd;
805 #endif /* ENABLE_PLUGINS */
807 ldlang_add_file (input);
809 if (config.map_file != NULL)
811 static bfd_boolean header_printed;
812 struct bfd_link_hash_entry *h;
816 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
828 case bfd_link_hash_defined:
829 case bfd_link_hash_defweak:
830 from = h->u.def.section->owner;
833 case bfd_link_hash_undefined:
834 case bfd_link_hash_undefweak:
835 from = h->u.undef.abfd;
838 case bfd_link_hash_common:
839 from = h->u.c.p->section->owner;
844 if (! header_printed)
848 sprintf (buf, _("Archive member included "
849 "to satisfy reference by file (symbol)\n\n"));
851 header_printed = TRUE;
854 if (bfd_my_archive (abfd) == NULL)
856 minfo ("%s", bfd_get_filename (abfd));
857 len = strlen (bfd_get_filename (abfd));
861 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
862 bfd_get_filename (abfd));
863 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
864 + strlen (bfd_get_filename (abfd))
882 minfo ("(%T)\n", h->root.string);
884 minfo ("(%s)\n", name);
887 if (trace_files || verbose)
888 info_msg ("%I\n", &orig_input);
892 /* This is called when BFD has discovered a symbol which is defined
896 multiple_definition (struct bfd_link_info *info,
897 struct bfd_link_hash_entry *h,
907 if (info->allow_multiple_definition)
912 case bfd_link_hash_defined:
913 osec = h->u.def.section;
914 oval = h->u.def.value;
915 obfd = h->u.def.section->owner;
917 case bfd_link_hash_indirect:
918 osec = bfd_ind_section_ptr;
926 /* Ignore a redefinition of an absolute symbol to the
927 same value; it's harmless. */
928 if (h->type == bfd_link_hash_defined
929 && bfd_is_abs_section (osec)
930 && bfd_is_abs_section (nsec)
934 /* If either section has the output_section field set to
935 bfd_abs_section_ptr, it means that the section is being
936 discarded, and this is not really a multiple definition at all.
937 FIXME: It would be cleaner to somehow ignore symbols defined in
938 sections which are being discarded. */
939 if ((osec->output_section != NULL
940 && ! bfd_is_abs_section (osec)
941 && bfd_is_abs_section (osec->output_section))
942 || (nsec->output_section != NULL
943 && ! bfd_is_abs_section (nsec)
944 && bfd_is_abs_section (nsec->output_section)))
947 name = h->root.string;
955 einfo (_("%X%C: multiple definition of `%T'\n"),
956 nbfd, nsec, nval, name);
958 einfo (_("%D: first defined here\n"), obfd, osec, oval);
960 if (RELAXATION_ENABLED_BY_USER)
962 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
969 /* This is called when there is a definition of a common symbol, or
970 when a common symbol is found for a symbol that is already defined,
971 or when two common symbols are found. We only do something if
972 -warn-common was used. */
975 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
976 struct bfd_link_hash_entry *h,
978 enum bfd_link_hash_type ntype,
983 enum bfd_link_hash_type otype;
986 if (!config.warn_common)
989 name = h->root.string;
991 if (otype == bfd_link_hash_common)
993 obfd = h->u.c.p->section->owner;
996 else if (otype == bfd_link_hash_defined
997 || otype == bfd_link_hash_defweak)
999 obfd = h->u.def.section->owner;
1004 /* FIXME: It would nice if we could report the BFD which defined
1005 an indirect symbol, but we don't have anywhere to store the
1011 if (ntype == bfd_link_hash_defined
1012 || ntype == bfd_link_hash_defweak
1013 || ntype == bfd_link_hash_indirect)
1015 ASSERT (otype == bfd_link_hash_common);
1016 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1019 einfo (_("%B: warning: common is here\n"), obfd);
1021 else if (otype == bfd_link_hash_defined
1022 || otype == bfd_link_hash_defweak
1023 || otype == bfd_link_hash_indirect)
1025 ASSERT (ntype == bfd_link_hash_common);
1026 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1029 einfo (_("%B: warning: defined here\n"), obfd);
1033 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1036 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1039 einfo (_("%B: warning: larger common is here\n"), obfd);
1041 else if (nsize > osize)
1043 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1046 einfo (_("%B: warning: smaller common is here\n"), obfd);
1050 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1052 einfo (_("%B: warning: previous common is here\n"), obfd);
1059 /* This is called when BFD has discovered a set element. H is the
1060 entry in the linker hash table for the set. SECTION and VALUE
1061 represent a value which should be added to the set. */
1064 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1065 struct bfd_link_hash_entry *h,
1066 bfd_reloc_code_real_type reloc,
1071 if (config.warn_constructors)
1072 einfo (_("%P: warning: global constructor %s used\n"),
1075 if (! config.build_constructors)
1078 ldctor_add_set_entry (h, reloc, NULL, section, value);
1080 if (h->type == bfd_link_hash_new)
1082 h->type = bfd_link_hash_undefined;
1083 h->u.undef.abfd = abfd;
1084 /* We don't call bfd_link_add_undef to add this to the list of
1085 undefined symbols because we are going to define it
1092 /* This is called when BFD has discovered a constructor. This is only
1093 called for some object file formats--those which do not handle
1094 constructors in some more clever fashion. This is similar to
1095 adding an element to a set, but less general. */
1098 constructor_callback (struct bfd_link_info *info,
1099 bfd_boolean constructor,
1106 struct bfd_link_hash_entry *h;
1107 char set_name[1 + sizeof "__CTOR_LIST__"];
1109 if (config.warn_constructors)
1110 einfo (_("%P: warning: global constructor %s used\n"), name);
1112 if (! config.build_constructors)
1115 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1116 useful error message. */
1117 if (bfd_reloc_type_lookup (info->output_bfd, BFD_RELOC_CTOR) == NULL
1118 && (bfd_link_relocatable (info)
1119 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1120 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1123 if (bfd_get_symbol_leading_char (abfd) != '\0')
1124 *s++ = bfd_get_symbol_leading_char (abfd);
1126 strcpy (s, "__CTOR_LIST__");
1128 strcpy (s, "__DTOR_LIST__");
1130 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1131 if (h == (struct bfd_link_hash_entry *) NULL)
1132 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1133 if (h->type == bfd_link_hash_new)
1135 h->type = bfd_link_hash_undefined;
1136 h->u.undef.abfd = abfd;
1137 /* We don't call bfd_link_add_undef to add this to the list of
1138 undefined symbols because we are going to define it
1142 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1146 /* A structure used by warning_callback to pass information through
1147 bfd_map_over_sections. */
1149 struct warning_callback_info
1152 const char *warning;
1157 /* Look through the relocs to see if we can find a plausible address
1158 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1161 symbol_warning (const char *warning, const char *symbol, bfd *abfd)
1163 struct warning_callback_info cinfo;
1165 if (!bfd_generic_link_read_symbols (abfd))
1166 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1168 cinfo.found = FALSE;
1169 cinfo.warning = warning;
1170 cinfo.symbol = symbol;
1171 cinfo.asymbols = bfd_get_outsymbols (abfd);
1172 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1176 /* This is called when there is a reference to a warning symbol. */
1179 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1180 const char *warning,
1186 /* This is a hack to support warn_multiple_gp. FIXME: This should
1187 have a cleaner interface, but what? */
1188 if (! config.warn_multiple_gp
1189 && strcmp (warning, "using multiple gp values") == 0)
1192 if (section != NULL)
1193 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1194 else if (abfd == NULL)
1195 einfo ("%P: %s%s\n", _("warning: "), warning);
1196 else if (symbol == NULL)
1197 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1198 else if (! symbol_warning (warning, symbol, abfd))
1201 /* Search all input files for a reference to SYMBOL. */
1202 for (b = info->input_bfds; b; b = b->link.next)
1203 if (b != abfd && symbol_warning (warning, symbol, b))
1205 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1211 /* This is called by warning_callback for each section. It checks the
1212 relocs of the section to see if it can find a reference to the
1213 symbol which triggered the warning. If it can, it uses the reloc
1214 to give an error message with a file and line number. */
1217 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1219 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1223 arelent **p, **pend;
1228 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1230 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1234 relpp = (arelent **) xmalloc (relsize);
1235 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1237 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1240 pend = p + relcount;
1241 for (; p < pend && *p != NULL; p++)
1245 if (q->sym_ptr_ptr != NULL
1246 && *q->sym_ptr_ptr != NULL
1247 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1249 /* We found a reloc for the symbol we are looking for. */
1250 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1260 /* This is called when an undefined symbol is found. */
1263 undefined_symbol (struct bfd_link_info *info,
1270 static char *error_name;
1271 static unsigned int error_count;
1273 #define MAX_ERRORS_IN_A_ROW 5
1275 if (info->ignore_hash != NULL
1276 && bfd_hash_lookup (info->ignore_hash, name, FALSE, FALSE) != NULL)
1279 if (config.warn_once)
1281 /* Only warn once about a particular undefined symbol. */
1282 add_ignoresym (info, name);
1285 /* We never print more than a reasonable number of errors in a row
1286 for a single symbol. */
1287 if (error_name != NULL
1288 && strcmp (name, error_name) == 0)
1293 if (error_name != NULL)
1295 error_name = xstrdup (name);
1298 if (section != NULL)
1300 if (error_count < MAX_ERRORS_IN_A_ROW)
1303 einfo (_("%X%C: undefined reference to `%T'\n"),
1304 abfd, section, address, name);
1306 einfo (_("%C: warning: undefined reference to `%T'\n"),
1307 abfd, section, address, name);
1309 else if (error_count == MAX_ERRORS_IN_A_ROW)
1312 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1313 abfd, section, address, name);
1315 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1316 abfd, section, address, name);
1323 if (error_count < MAX_ERRORS_IN_A_ROW)
1326 einfo (_("%X%B: undefined reference to `%T'\n"),
1329 einfo (_("%B: warning: undefined reference to `%T'\n"),
1332 else if (error_count == MAX_ERRORS_IN_A_ROW)
1335 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1338 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1348 /* Counter to limit the number of relocation overflow error messages
1349 to print. Errors are printed as it is decremented. When it's
1350 called and the counter is zero, a final message is printed
1351 indicating more relocations were omitted. When it gets to -1, no
1352 such errors are printed. If it's initially set to a value less
1353 than -1, all such errors will be printed (--verbose does this). */
1355 int overflow_cutoff_limit = 10;
1357 /* This is called when a reloc overflows. */
1360 reloc_overflow (struct bfd_link_info *info,
1361 struct bfd_link_hash_entry *entry,
1363 const char *reloc_name,
1369 if (overflow_cutoff_limit == -1)
1372 einfo ("%X%H:", abfd, section, address);
1374 if (overflow_cutoff_limit >= 0
1375 && overflow_cutoff_limit-- == 0)
1377 einfo (_(" additional relocation overflows omitted from the output\n"));
1383 while (entry->type == bfd_link_hash_indirect
1384 || entry->type == bfd_link_hash_warning)
1385 entry = entry->u.i.link;
1386 switch (entry->type)
1388 case bfd_link_hash_undefined:
1389 case bfd_link_hash_undefweak:
1390 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1391 reloc_name, entry->root.string);
1393 case bfd_link_hash_defined:
1394 case bfd_link_hash_defweak:
1395 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1396 reloc_name, entry->root.string,
1397 entry->u.def.section,
1398 entry->u.def.section == bfd_abs_section_ptr
1399 ? info->output_bfd : entry->u.def.section->owner);
1407 einfo (_(" relocation truncated to fit: %s against `%T'"),
1410 einfo ("+%v", addend);
1415 /* This is called when a dangerous relocation is made. */
1418 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1419 const char *message,
1424 einfo (_("%X%H: dangerous relocation: %s\n"),
1425 abfd, section, address, message);
1429 /* This is called when a reloc is being generated attached to a symbol
1430 that is not being output. */
1433 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1439 einfo (_("%X%H: reloc refers to symbol `%T' which is not being output\n"),
1440 abfd, section, address, name);
1444 /* This is called if link_info.notice_all is set, or when a symbol in
1445 link_info.notice_hash is found. Symbols are put in notice_hash
1446 using the -y option, while notice_all is set if the --cref option
1447 has been supplied, or if there are any NOCROSSREFS sections in the
1448 linker script; and if plugins are active, since they need to monitor
1449 all references from non-IR files. */
1452 notice (struct bfd_link_info *info,
1453 struct bfd_link_hash_entry *h,
1454 struct bfd_link_hash_entry *inh ATTRIBUTE_UNUSED,
1458 flagword flags ATTRIBUTE_UNUSED)
1464 if (command_line.cref || nocrossref_list != NULL)
1465 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1469 name = h->root.string;
1470 if (info->notice_hash != NULL
1471 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL)
1473 if (bfd_is_und_section (section))
1474 einfo ("%B: reference to %s\n", abfd, name);
1476 einfo ("%B: definition of %s\n", abfd, name);
1479 if (command_line.cref || nocrossref_list != NULL)
1480 add_cref (name, abfd, section, value);