1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of the GNU Binutils.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
26 #include "safe-ctype.h"
27 #include "libiberty.h"
30 #include "filenames.h"
44 /* Somewhere above, sys/stat.h got included. */
45 #if !defined(S_ISDIR) && defined(S_IFDIR)
46 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
57 #ifndef TARGET_SYSTEM_ROOT
58 #define TARGET_SYSTEM_ROOT ""
63 FILE *saved_script_handle = NULL;
64 FILE *previous_script_handle = NULL;
65 bfd_boolean force_make_executable = FALSE;
68 const char *output_filename = "a.out";
70 /* Name this program was invoked by. */
73 /* The prefix for system library directories. */
74 const char *ld_sysroot;
76 /* The canonical representation of ld_sysroot. */
77 char * ld_canon_sysroot;
78 int ld_canon_sysroot_len;
80 /* Set by -G argument, for MIPS ECOFF target. */
81 int g_switch_value = 8;
83 /* Nonzero means print names of input files as processed. */
84 bfd_boolean trace_files;
86 /* Nonzero means same, but note open failures, too. */
87 bfd_boolean trace_file_tries;
89 /* Nonzero means version number was printed, so exit successfully
90 instead of complaining if no input files are given. */
91 bfd_boolean version_printed;
93 /* Nonzero means link in every member of an archive. */
94 bfd_boolean whole_archive;
96 /* Nonzero means create DT_NEEDED entries only if a dynamic library
97 actually satisfies some reference in a regular object. */
98 bfd_boolean as_needed;
100 /* Nonzero means never create DT_NEEDED entries for dynamic libraries
101 in DT_NEEDED tags. */
102 bfd_boolean add_needed = TRUE;
104 /* TRUE if we should demangle symbol names. */
105 bfd_boolean demangling;
107 args_type command_line;
109 ld_config_type config;
111 sort_type sort_section;
113 static const char *get_sysroot
115 static char *get_emulation
117 static bfd_boolean add_archive_element
118 (struct bfd_link_info *, bfd *, const char *);
119 static bfd_boolean multiple_definition
120 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
121 bfd *, asection *, bfd_vma);
122 static bfd_boolean multiple_common
123 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
124 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
125 static bfd_boolean add_to_set
126 (struct bfd_link_info *, struct bfd_link_hash_entry *,
127 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
128 static bfd_boolean constructor_callback
129 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
130 asection *, bfd_vma);
131 static bfd_boolean warning_callback
132 (struct bfd_link_info *, const char *, const char *, bfd *,
133 asection *, bfd_vma);
134 static void warning_find_reloc
135 (bfd *, asection *, void *);
136 static bfd_boolean undefined_symbol
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
139 static bfd_boolean reloc_overflow
140 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
141 const char *, bfd_vma, bfd *, asection *, bfd_vma);
142 static bfd_boolean reloc_dangerous
143 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
144 static bfd_boolean unattached_reloc
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean notice
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
149 static struct bfd_link_callbacks link_callbacks =
155 constructor_callback,
165 ldlang_override_segment_assignment
168 struct bfd_link_info link_info;
175 if (link_info.output_bfd)
176 bfd_cache_close (link_info.output_bfd);
177 if (delete_output_file_on_failure)
178 unlink_if_ordinary (output_filename);
183 main (int argc, char **argv)
186 long start_time = get_run_time ();
188 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
189 setlocale (LC_MESSAGES, "");
191 #if defined (HAVE_SETLOCALE)
192 setlocale (LC_CTYPE, "");
194 bindtextdomain (PACKAGE, LOCALEDIR);
195 textdomain (PACKAGE);
197 program_name = argv[0];
198 xmalloc_set_program_name (program_name);
200 START_PROGRESS (program_name, 0);
202 expandargv (&argc, &argv);
206 bfd_set_error_program_name (program_name);
208 xatexit (remove_output);
210 /* Set up the sysroot directory. */
211 ld_sysroot = get_sysroot (argc, argv);
214 if (*TARGET_SYSTEM_ROOT == 0)
216 einfo ("%P%F: this linker was not configured to use sysroots\n");
220 ld_canon_sysroot = lrealpath (ld_sysroot);
222 if (ld_canon_sysroot)
223 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
225 ld_canon_sysroot_len = -1;
227 /* Set the default BFD target based on the configured target. Doing
228 this permits the linker to be configured for a particular target,
229 and linked against a shared BFD library which was configured for
230 a different target. The macro TARGET is defined by Makefile. */
231 if (! bfd_set_default_target (TARGET))
233 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
244 config.build_constructors = TRUE;
245 config.rpath_separator = ':';
246 config.split_by_reloc = (unsigned) -1;
247 config.split_by_file = (bfd_size_type) -1;
248 config.make_executable = TRUE;
249 config.magic_demand_paged = TRUE;
250 config.text_read_only = TRUE;
252 command_line.warn_mismatch = TRUE;
253 command_line.warn_search_mismatch = TRUE;
254 command_line.check_section_addresses = -1;
256 /* We initialize DEMANGLING based on the environment variable
257 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
258 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
259 environment. Acting the same way here lets us provide the same
260 interface by default. */
261 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
263 link_info.allow_undefined_version = TRUE;
264 link_info.keep_memory = TRUE;
265 link_info.combreloc = TRUE;
266 link_info.strip_discarded = TRUE;
267 link_info.emit_hash = TRUE;
268 link_info.callbacks = &link_callbacks;
269 link_info.input_bfds_tail = &link_info.input_bfds;
270 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
271 and _fini symbols. We are compatible. */
272 link_info.init_function = "_init";
273 link_info.fini_function = "_fini";
274 link_info.relax_pass = 1;
275 link_info.pei386_auto_import = -1;
276 link_info.spare_dynamic_tags = 5;
277 link_info.path_separator = ':';
279 ldfile_add_arch ("");
280 emulation = get_emulation (argc, argv);
281 ldemul_choose_mode (emulation);
282 default_target = ldemul_choose_target (argc, argv);
284 ldemul_before_parse ();
285 lang_has_input_file = FALSE;
286 parse_args (argc, argv);
288 if (config.hash_table_size != 0)
289 bfd_hash_set_default_size (config.hash_table_size);
291 ldemul_set_symbols ();
293 if (link_info.relocatable)
295 if (command_line.check_section_addresses < 0)
296 command_line.check_section_addresses = 0;
297 if (command_line.relax)
298 einfo (_("%P%F: --relax and -r may not be used together\n"));
299 if (link_info.shared)
300 einfo (_("%P%F: -r and -shared may not be used together\n"));
303 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
304 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
305 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
306 for shared libraries. -Bsymbolic overrides all others and vice
308 switch (command_line.symbolic)
313 /* -Bsymbolic is for shared library only. */
314 if (link_info.shared)
316 link_info.symbolic = TRUE;
317 /* Should we free the unused memory? */
318 link_info.dynamic_list = NULL;
319 command_line.dynamic_list = dynamic_list_unset;
322 case symbolic_functions:
323 /* -Bsymbolic-functions is for shared library only. */
324 if (link_info.shared)
325 command_line.dynamic_list = dynamic_list_data;
329 switch (command_line.dynamic_list)
331 case dynamic_list_unset:
333 case dynamic_list_data:
334 link_info.dynamic_data = TRUE;
336 link_info.dynamic = TRUE;
340 if (! link_info.shared)
342 if (command_line.filter_shlib)
343 einfo (_("%P%F: -F may not be used without -shared\n"));
344 if (command_line.auxiliary_filters)
345 einfo (_("%P%F: -f may not be used without -shared\n"));
348 if (! link_info.shared || link_info.pie)
349 link_info.executable = TRUE;
351 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
352 don't see how else this can be handled, since in this case we
353 must preserve all externally visible symbols. */
354 if (link_info.relocatable && link_info.strip == strip_all)
356 link_info.strip = strip_debugger;
357 if (link_info.discard == discard_sec_merge)
358 link_info.discard = discard_all;
361 /* If we have not already opened and parsed a linker script,
362 try the default script from command line first. */
363 if (saved_script_handle == NULL
364 && command_line.default_script != NULL)
366 ldfile_open_command_file (command_line.default_script);
367 parser_input = input_script;
371 /* If we have not already opened and parsed a linker script
372 read the emulation's appropriate default script. */
373 if (saved_script_handle == NULL)
376 char *s = ldemul_get_script (&isfile);
379 ldfile_open_command_file (s);
385 parser_input = input_script;
390 if (trace_file_tries)
392 if (saved_script_handle)
393 info_msg (_("using external linker script:"));
395 info_msg (_("using internal linker script:"));
396 info_msg ("\n==================================================\n");
398 if (saved_script_handle)
400 static const int ld_bufsz = 8193;
402 char *buf = xmalloc (ld_bufsz);
404 rewind (saved_script_handle);
405 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
410 rewind (saved_script_handle);
417 info_msg (ldemul_get_script (&isfile));
420 info_msg ("\n==================================================\n");
425 if (!lang_has_input_file)
429 einfo (_("%P%F: no input files\n"));
433 info_msg (_("%P: mode %s\n"), emulation);
435 ldemul_after_parse ();
437 if (config.map_filename)
439 if (strcmp (config.map_filename, "-") == 0)
441 config.map_file = stdout;
445 config.map_file = fopen (config.map_filename, FOPEN_WT);
446 if (config.map_file == (FILE *) NULL)
448 bfd_set_error (bfd_error_system_call);
449 einfo (_("%P%F: cannot open map file %s: %E\n"),
450 config.map_filename);
457 /* Print error messages for any missing symbols, for any warning
458 symbols, and possibly multiple definitions. */
459 if (link_info.relocatable)
460 link_info.output_bfd->flags &= ~EXEC_P;
462 link_info.output_bfd->flags |= EXEC_P;
466 if (config.map_file != NULL)
468 if (command_line.cref)
469 output_cref (config.map_file != NULL ? config.map_file : stdout);
470 if (nocrossref_list != NULL)
471 check_nocrossrefs ();
475 /* Even if we're producing relocatable output, some non-fatal errors should
476 be reported in the exit status. (What non-fatal errors, if any, do we
477 want to ignore for relocatable output?) */
478 if (!config.make_executable && !force_make_executable)
481 einfo (_("%P: link errors found, deleting executable `%s'\n"),
484 /* The file will be removed by remove_output. */
489 if (! bfd_close (link_info.output_bfd))
490 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
492 /* If the --force-exe-suffix is enabled, and we're making an
493 executable file and it doesn't end in .exe, copy it to one
495 if (! link_info.relocatable && command_line.force_exe_suffix)
497 int len = strlen (output_filename);
500 || (strcasecmp (output_filename + len - 4, ".exe") != 0
501 && strcasecmp (output_filename + len - 4, ".dll") != 0))
505 const int bsize = 4096;
506 char *buf = xmalloc (bsize);
508 char *dst_name = xmalloc (len + 5);
510 strcpy (dst_name, output_filename);
511 strcat (dst_name, ".exe");
512 src = fopen (output_filename, FOPEN_RB);
513 dst = fopen (dst_name, FOPEN_WB);
516 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
519 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
521 while ((l = fread (buf, 1, bsize, src)) > 0)
523 int done = fwrite (buf, 1, l, dst);
526 einfo (_("%P: Error writing file `%s'\n"), dst_name);
530 if (fclose (dst) == EOF)
531 einfo (_("%P: Error closing file `%s'\n"), dst_name);
538 END_PROGRESS (program_name);
543 char *lim = sbrk (0);
545 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);
550 fprintf (stderr, _("%s: data size %ld\n"), program_name,
551 (long) (lim - (char *) &environ));
555 /* Prevent remove_output from doing anything, after a successful link. */
556 output_filename = NULL;
562 /* If the configured sysroot is relocatable, try relocating it based on
563 default prefix FROM. Return the relocated directory if it exists,
564 otherwise return null. */
567 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
569 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
573 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
576 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
584 /* Return the sysroot directory. Return "" if no sysroot is being used. */
587 get_sysroot (int argc, char **argv)
592 for (i = 1; i < argc; i++)
593 if (CONST_STRNEQ (argv[i], "--sysroot="))
594 return argv[i] + strlen ("--sysroot=");
596 path = get_relative_sysroot (BINDIR);
600 path = get_relative_sysroot (TOOLBINDIR);
604 return TARGET_SYSTEM_ROOT;
607 /* We need to find any explicitly given emulation in order to initialize the
608 state that's needed by the lex&yacc argument parser (parse_args). */
611 get_emulation (int argc, char **argv)
616 emulation = getenv (EMULATION_ENVIRON);
617 if (emulation == NULL)
618 emulation = DEFAULT_EMULATION;
620 for (i = 1; i < argc; i++)
622 if (CONST_STRNEQ (argv[i], "-m"))
624 if (argv[i][2] == '\0')
629 emulation = argv[i + 1];
633 einfo (_("%P%F: missing argument to -m\n"));
635 else if (strcmp (argv[i], "-mips1") == 0
636 || strcmp (argv[i], "-mips2") == 0
637 || strcmp (argv[i], "-mips3") == 0
638 || strcmp (argv[i], "-mips4") == 0
639 || strcmp (argv[i], "-mips5") == 0
640 || strcmp (argv[i], "-mips32") == 0
641 || strcmp (argv[i], "-mips32r2") == 0
642 || strcmp (argv[i], "-mips64") == 0
643 || strcmp (argv[i], "-mips64r2") == 0)
645 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
646 passed to the linker by some MIPS compilers. They
647 generally tell the linker to use a slightly different
648 library path. Perhaps someday these should be
649 implemented as emulations; until then, we just ignore
650 the arguments and hope that nobody ever creates
651 emulations named ips1, ips2 or ips3. */
653 else if (strcmp (argv[i], "-m486") == 0)
655 /* FIXME: The argument -m486 is passed to the linker on
656 some Linux systems. Hope that nobody creates an
657 emulation named 486. */
662 emulation = &argv[i][2];
671 add_ysym (const char *name)
673 if (link_info.notice_hash == NULL)
675 link_info.notice_hash = 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 (_("%P%F: bfd_hash_table_init failed: %E\n"));
683 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
684 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
687 /* Record a symbol to be wrapped, from the --wrap option. */
690 add_wrap (const char *name)
692 if (link_info.wrap_hash == NULL)
694 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
695 if (!bfd_hash_table_init_n (link_info.wrap_hash,
697 sizeof (struct bfd_hash_entry),
699 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
702 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
703 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
706 /* Handle the -retain-symbols-file option. */
709 add_keepsyms_file (const char *filename)
716 if (link_info.strip == strip_some)
717 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
719 file = fopen (filename, "r");
722 bfd_set_error (bfd_error_system_call);
723 einfo ("%X%P: %s: %E\n", filename);
727 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
728 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
729 sizeof (struct bfd_hash_entry)))
730 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
733 buf = xmalloc (bufsize);
745 while (! ISSPACE (c) && c != EOF)
752 buf = xrealloc (buf, bufsize);
759 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
760 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
764 if (link_info.strip != strip_none)
765 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
768 link_info.strip = strip_some;
771 /* Callbacks from the BFD linker routines. */
773 /* This is called when BFD has decided to include an archive member in
777 add_archive_element (struct bfd_link_info *info,
781 lang_input_statement_type *input;
783 input = 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 ldlang_add_file (input);
790 if (config.map_file != NULL)
792 static bfd_boolean header_printed;
793 struct bfd_link_hash_entry *h;
797 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
809 case bfd_link_hash_defined:
810 case bfd_link_hash_defweak:
811 from = h->u.def.section->owner;
814 case bfd_link_hash_undefined:
815 case bfd_link_hash_undefweak:
816 from = h->u.undef.abfd;
819 case bfd_link_hash_common:
820 from = h->u.c.p->section->owner;
825 if (! header_printed)
829 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
831 header_printed = TRUE;
834 if (bfd_my_archive (abfd) == NULL)
836 minfo ("%s", bfd_get_filename (abfd));
837 len = strlen (bfd_get_filename (abfd));
841 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
842 bfd_get_filename (abfd));
843 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
844 + strlen (bfd_get_filename (abfd))
862 minfo ("(%T)\n", h->root.string);
864 minfo ("(%s)\n", name);
867 if (trace_files || trace_file_tries)
868 info_msg ("%I\n", input);
873 /* This is called when BFD has discovered a symbol which is defined
877 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
886 /* If either section has the output_section field set to
887 bfd_abs_section_ptr, it means that the section is being
888 discarded, and this is not really a multiple definition at all.
889 FIXME: It would be cleaner to somehow ignore symbols defined in
890 sections which are being discarded. */
891 if ((osec->output_section != NULL
892 && ! bfd_is_abs_section (osec)
893 && bfd_is_abs_section (osec->output_section))
894 || (nsec->output_section != NULL
895 && ! bfd_is_abs_section (nsec)
896 && bfd_is_abs_section (nsec->output_section)))
899 einfo (_("%X%C: multiple definition of `%T'\n"),
900 nbfd, nsec, nval, name);
902 einfo (_("%D: first defined here\n"), obfd, osec, oval);
904 if (command_line.relax)
906 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
907 command_line.relax = 0;
913 /* This is called when there is a definition of a common symbol, or
914 when a common symbol is found for a symbol that is already defined,
915 or when two common symbols are found. We only do something if
916 -warn-common was used. */
919 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
922 enum bfd_link_hash_type otype,
925 enum bfd_link_hash_type ntype,
928 if (! config.warn_common)
931 if (ntype == bfd_link_hash_defined
932 || ntype == bfd_link_hash_defweak
933 || ntype == bfd_link_hash_indirect)
935 ASSERT (otype == bfd_link_hash_common);
936 einfo (_("%B: warning: definition of `%T' overriding common\n"),
939 einfo (_("%B: warning: common is here\n"), obfd);
941 else if (otype == bfd_link_hash_defined
942 || otype == bfd_link_hash_defweak
943 || otype == bfd_link_hash_indirect)
945 ASSERT (ntype == bfd_link_hash_common);
946 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
949 einfo (_("%B: warning: defined here\n"), obfd);
953 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
956 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
959 einfo (_("%B: warning: larger common is here\n"), obfd);
961 else if (nsize > osize)
963 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
966 einfo (_("%B: warning: smaller common is here\n"), obfd);
970 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
972 einfo (_("%B: warning: previous common is here\n"), obfd);
979 /* This is called when BFD has discovered a set element. H is the
980 entry in the linker hash table for the set. SECTION and VALUE
981 represent a value which should be added to the set. */
984 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
985 struct bfd_link_hash_entry *h,
986 bfd_reloc_code_real_type reloc,
991 if (config.warn_constructors)
992 einfo (_("%P: warning: global constructor %s used\n"),
995 if (! config.build_constructors)
998 ldctor_add_set_entry (h, reloc, NULL, section, value);
1000 if (h->type == bfd_link_hash_new)
1002 h->type = bfd_link_hash_undefined;
1003 h->u.undef.abfd = abfd;
1004 /* We don't call bfd_link_add_undef to add this to the list of
1005 undefined symbols because we are going to define it
1012 /* This is called when BFD has discovered a constructor. This is only
1013 called for some object file formats--those which do not handle
1014 constructors in some more clever fashion. This is similar to
1015 adding an element to a set, but less general. */
1018 constructor_callback (struct bfd_link_info *info,
1019 bfd_boolean constructor,
1026 struct bfd_link_hash_entry *h;
1027 char set_name[1 + sizeof "__CTOR_LIST__"];
1029 if (config.warn_constructors)
1030 einfo (_("%P: warning: global constructor %s used\n"), name);
1032 if (! config.build_constructors)
1035 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1036 useful error message. */
1037 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1038 && (info->relocatable
1039 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1040 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1043 if (bfd_get_symbol_leading_char (abfd) != '\0')
1044 *s++ = bfd_get_symbol_leading_char (abfd);
1046 strcpy (s, "__CTOR_LIST__");
1048 strcpy (s, "__DTOR_LIST__");
1050 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1051 if (h == (struct bfd_link_hash_entry *) NULL)
1052 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1053 if (h->type == bfd_link_hash_new)
1055 h->type = bfd_link_hash_undefined;
1056 h->u.undef.abfd = abfd;
1057 /* We don't call bfd_link_add_undef to add this to the list of
1058 undefined symbols because we are going to define it
1062 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1066 /* A structure used by warning_callback to pass information through
1067 bfd_map_over_sections. */
1069 struct warning_callback_info
1072 const char *warning;
1077 /* This is called when there is a reference to a warning symbol. */
1080 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1081 const char *warning,
1087 /* This is a hack to support warn_multiple_gp. FIXME: This should
1088 have a cleaner interface, but what? */
1089 if (! config.warn_multiple_gp
1090 && strcmp (warning, "using multiple gp values") == 0)
1093 if (section != NULL)
1094 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1095 else if (abfd == NULL)
1096 einfo ("%P: %s%s\n", _("warning: "), warning);
1097 else if (symbol == NULL)
1098 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1101 struct warning_callback_info info;
1103 /* Look through the relocs to see if we can find a plausible
1106 if (!bfd_generic_link_read_symbols (abfd))
1107 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1110 info.warning = warning;
1111 info.symbol = symbol;
1112 info.asymbols = bfd_get_outsymbols (abfd);
1113 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1116 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1122 /* This is called by warning_callback for each section. It checks the
1123 relocs of the section to see if it can find a reference to the
1124 symbol which triggered the warning. If it can, it uses the reloc
1125 to give an error message with a file and line number. */
1128 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1130 struct warning_callback_info *info = iarg;
1134 arelent **p, **pend;
1139 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1141 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1145 relpp = xmalloc (relsize);
1146 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1148 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1151 pend = p + relcount;
1152 for (; p < pend && *p != NULL; p++)
1156 if (q->sym_ptr_ptr != NULL
1157 && *q->sym_ptr_ptr != NULL
1158 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1160 /* We found a reloc for the symbol we are looking for. */
1161 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1171 /* This is called when an undefined symbol is found. */
1174 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1181 static char *error_name;
1182 static unsigned int error_count;
1184 #define MAX_ERRORS_IN_A_ROW 5
1186 if (config.warn_once)
1188 static struct bfd_hash_table *hash;
1190 /* Only warn once about a particular undefined symbol. */
1193 hash = xmalloc (sizeof (struct bfd_hash_table));
1194 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1195 sizeof (struct bfd_hash_entry)))
1196 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1199 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1202 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1203 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1206 /* We never print more than a reasonable number of errors in a row
1207 for a single symbol. */
1208 if (error_name != NULL
1209 && strcmp (name, error_name) == 0)
1214 if (error_name != NULL)
1216 error_name = xstrdup (name);
1219 if (section != NULL)
1221 if (error_count < MAX_ERRORS_IN_A_ROW)
1224 einfo (_("%X%C: undefined reference to `%T'\n"),
1225 abfd, section, address, name);
1227 einfo (_("%C: warning: undefined reference to `%T'\n"),
1228 abfd, section, address, name);
1230 else if (error_count == MAX_ERRORS_IN_A_ROW)
1233 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1234 abfd, section, address, name);
1236 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1237 abfd, section, address, name);
1244 if (error_count < MAX_ERRORS_IN_A_ROW)
1247 einfo (_("%X%B: undefined reference to `%T'\n"),
1250 einfo (_("%B: warning: undefined reference to `%T'\n"),
1253 else if (error_count == MAX_ERRORS_IN_A_ROW)
1256 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1259 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1269 /* Counter to limit the number of relocation overflow error messages
1270 to print. Errors are printed as it is decremented. When it's
1271 called and the counter is zero, a final message is printed
1272 indicating more relocations were omitted. When it gets to -1, no
1273 such errors are printed. If it's initially set to a value less
1274 than -1, all such errors will be printed (--verbose does this). */
1276 int overflow_cutoff_limit = 10;
1278 /* This is called when a reloc overflows. */
1281 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1282 struct bfd_link_hash_entry *entry,
1284 const char *reloc_name,
1290 if (overflow_cutoff_limit == -1)
1293 einfo ("%X%C:", abfd, section, address);
1295 if (overflow_cutoff_limit >= 0
1296 && overflow_cutoff_limit-- == 0)
1298 einfo (_(" additional relocation overflows omitted from the output\n"));
1304 while (entry->type == bfd_link_hash_indirect
1305 || entry->type == bfd_link_hash_warning)
1306 entry = entry->u.i.link;
1307 switch (entry->type)
1309 case bfd_link_hash_undefined:
1310 case bfd_link_hash_undefweak:
1311 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1312 reloc_name, entry->root.string);
1314 case bfd_link_hash_defined:
1315 case bfd_link_hash_defweak:
1316 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1317 reloc_name, entry->root.string,
1318 entry->u.def.section,
1319 entry->u.def.section == bfd_abs_section_ptr
1320 ? link_info.output_bfd : entry->u.def.section->owner);
1328 einfo (_(" relocation truncated to fit: %s against `%T'"),
1331 einfo ("+%v", addend);
1336 /* This is called when a dangerous relocation is made. */
1339 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1340 const char *message,
1345 einfo (_("%X%C: dangerous relocation: %s\n"),
1346 abfd, section, address, message);
1350 /* This is called when a reloc is being generated attached to a symbol
1351 that is not being output. */
1354 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1360 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1361 abfd, section, address, name);
1365 /* This is called if link_info.notice_all is set, or when a symbol in
1366 link_info.notice_hash is found. Symbols are put in notice_hash
1367 using the -y option. */
1370 notice (struct bfd_link_info *info,
1378 if (command_line.cref || nocrossref_list != NULL)
1379 return handle_asneeded_cref (abfd, value);
1383 if (! info->notice_all
1384 || (info->notice_hash != NULL
1385 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1387 if (bfd_is_und_section (section))
1388 einfo ("%B: reference to %s\n", abfd, name);
1390 einfo ("%B: definition of %s\n", abfd, name);
1393 if (command_line.cref || nocrossref_list != NULL)
1394 add_cref (name, abfd, section, value);