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, 2009, 2010, 2011
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"
45 #include "plugin-api.h"
47 #endif /* ENABLE_PLUGINS */
49 /* Somewhere above, sys/stat.h got included. */
50 #if !defined(S_ISDIR) && defined(S_IFDIR)
51 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
62 #ifndef TARGET_SYSTEM_ROOT
63 #define TARGET_SYSTEM_ROOT ""
68 FILE *saved_script_handle
= NULL
;
69 FILE *previous_script_handle
= NULL
;
70 bfd_boolean force_make_executable
= FALSE
;
73 const char *output_filename
= "a.out";
75 /* Name this program was invoked by. */
78 /* The prefix for system library directories. */
79 const char *ld_sysroot
;
81 /* The canonical representation of ld_sysroot. */
82 char * ld_canon_sysroot
;
83 int ld_canon_sysroot_len
;
85 /* Set by -G argument, for MIPS ECOFF target. */
86 int g_switch_value
= 8;
88 /* Nonzero means print names of input files as processed. */
89 bfd_boolean trace_files
;
91 /* Nonzero means same, but note open failures, too. */
92 bfd_boolean trace_file_tries
;
94 /* Nonzero means version number was printed, so exit successfully
95 instead of complaining if no input files are given. */
96 bfd_boolean version_printed
;
98 /* Nonzero means link in every member of an archive. */
99 bfd_boolean whole_archive
;
101 /* True means only create DT_NEEDED entries for dynamic libraries
102 if they actually satisfy some reference in a regular object. */
103 bfd_boolean add_DT_NEEDED_for_regular
;
105 /* True means create DT_NEEDED entries for dynamic libraries that
106 are DT_NEEDED by dynamic libraries specifically mentioned on
108 bfd_boolean add_DT_NEEDED_for_dynamic
= TRUE
;
110 /* TRUE if we should demangle symbol names. */
111 bfd_boolean demangling
;
113 args_type command_line
;
115 ld_config_type config
;
117 sort_type sort_section
;
119 static const char *get_sysroot
121 static char *get_emulation
123 static bfd_boolean add_archive_element
124 (struct bfd_link_info
*, bfd
*, const char *, bfd
**);
125 static bfd_boolean multiple_definition
126 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
127 bfd
*, asection
*, bfd_vma
);
128 static bfd_boolean multiple_common
129 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
130 bfd
*, enum bfd_link_hash_type
, bfd_vma
);
131 static bfd_boolean add_to_set
132 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
133 bfd_reloc_code_real_type
, bfd
*, asection
*, bfd_vma
);
134 static bfd_boolean constructor_callback
135 (struct bfd_link_info
*, bfd_boolean
, const char *, bfd
*,
136 asection
*, bfd_vma
);
137 static bfd_boolean warning_callback
138 (struct bfd_link_info
*, const char *, const char *, bfd
*,
139 asection
*, bfd_vma
);
140 static void warning_find_reloc
141 (bfd
*, asection
*, void *);
142 static bfd_boolean undefined_symbol
143 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
,
145 static bfd_boolean reloc_overflow
146 (struct bfd_link_info
*, struct bfd_link_hash_entry
*, const char *,
147 const char *, bfd_vma
, bfd
*, asection
*, bfd_vma
);
148 static bfd_boolean reloc_dangerous
149 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
150 static bfd_boolean unattached_reloc
151 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
152 static bfd_boolean notice
153 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
155 static struct bfd_link_callbacks link_callbacks
=
161 constructor_callback
,
171 ldlang_override_segment_assignment
174 struct bfd_link_info link_info
;
179 bfd_cache_close_all ();
180 #ifdef ENABLE_PLUGINS
181 plugin_call_cleanup ();
183 if (output_filename
&& delete_output_file_on_failure
)
184 unlink_if_ordinary (output_filename
);
188 main (int argc
, char **argv
)
191 long start_time
= get_run_time ();
193 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
194 setlocale (LC_MESSAGES
, "");
196 #if defined (HAVE_SETLOCALE)
197 setlocale (LC_CTYPE
, "");
199 bindtextdomain (PACKAGE
, LOCALEDIR
);
200 textdomain (PACKAGE
);
202 program_name
= argv
[0];
203 xmalloc_set_program_name (program_name
);
205 START_PROGRESS (program_name
, 0);
207 expandargv (&argc
, &argv
);
211 bfd_set_error_program_name (program_name
);
213 xatexit (ld_cleanup
);
215 /* Set up the sysroot directory. */
216 ld_sysroot
= get_sysroot (argc
, argv
);
219 if (*TARGET_SYSTEM_ROOT
== 0)
221 einfo ("%P%F: this linker was not configured to use sysroots\n");
225 ld_canon_sysroot
= lrealpath (ld_sysroot
);
227 if (ld_canon_sysroot
)
228 ld_canon_sysroot_len
= strlen (ld_canon_sysroot
);
230 ld_canon_sysroot_len
= -1;
232 /* Set the default BFD target based on the configured target. Doing
233 this permits the linker to be configured for a particular target,
234 and linked against a shared BFD library which was configured for
235 a different target. The macro TARGET is defined by Makefile. */
236 if (! bfd_set_default_target (TARGET
))
238 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
249 config
.build_constructors
= TRUE
;
250 config
.rpath_separator
= ':';
251 config
.split_by_reloc
= (unsigned) -1;
252 config
.split_by_file
= (bfd_size_type
) -1;
253 config
.make_executable
= TRUE
;
254 config
.magic_demand_paged
= TRUE
;
255 config
.text_read_only
= TRUE
;
257 command_line
.warn_mismatch
= TRUE
;
258 command_line
.warn_search_mismatch
= TRUE
;
259 command_line
.check_section_addresses
= -1;
260 command_line
.disable_target_specific_optimizations
= -1;
262 /* We initialize DEMANGLING based on the environment variable
263 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
264 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
265 environment. Acting the same way here lets us provide the same
266 interface by default. */
267 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
269 link_info
.allow_undefined_version
= TRUE
;
270 link_info
.keep_memory
= TRUE
;
271 link_info
.combreloc
= TRUE
;
272 link_info
.strip_discarded
= TRUE
;
273 link_info
.emit_hash
= TRUE
;
274 link_info
.callbacks
= &link_callbacks
;
275 link_info
.input_bfds_tail
= &link_info
.input_bfds
;
276 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
277 and _fini symbols. We are compatible. */
278 link_info
.init_function
= "_init";
279 link_info
.fini_function
= "_fini";
280 link_info
.relax_pass
= 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
);
292 ldemul_before_parse ();
293 lang_has_input_file
= FALSE
;
294 parse_args (argc
, argv
);
296 if (config
.hash_table_size
!= 0)
297 bfd_hash_set_default_size (config
.hash_table_size
);
299 ldemul_set_symbols ();
301 if (link_info
.relocatable
)
303 if (command_line
.check_section_addresses
< 0)
304 command_line
.check_section_addresses
= 0;
305 if (link_info
.shared
)
306 einfo (_("%P%F: -r and -shared may not be used together\n"));
309 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
310 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
311 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
312 for shared libraries. -Bsymbolic overrides all others and vice
314 switch (command_line
.symbolic
)
319 /* -Bsymbolic is for shared library only. */
320 if (link_info
.shared
)
322 link_info
.symbolic
= TRUE
;
323 /* Should we free the unused memory? */
324 link_info
.dynamic_list
= NULL
;
325 command_line
.dynamic_list
= dynamic_list_unset
;
328 case symbolic_functions
:
329 /* -Bsymbolic-functions is for shared library only. */
330 if (link_info
.shared
)
331 command_line
.dynamic_list
= dynamic_list_data
;
335 switch (command_line
.dynamic_list
)
337 case dynamic_list_unset
:
339 case dynamic_list_data
:
340 link_info
.dynamic_data
= TRUE
;
342 link_info
.dynamic
= TRUE
;
346 if (! link_info
.shared
)
348 if (command_line
.filter_shlib
)
349 einfo (_("%P%F: -F may not be used without -shared\n"));
350 if (command_line
.auxiliary_filters
)
351 einfo (_("%P%F: -f may not be used without -shared\n"));
354 if (! link_info
.shared
|| link_info
.pie
)
355 link_info
.executable
= TRUE
;
357 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
358 don't see how else this can be handled, since in this case we
359 must preserve all externally visible symbols. */
360 if (link_info
.relocatable
&& link_info
.strip
== strip_all
)
362 link_info
.strip
= strip_debugger
;
363 if (link_info
.discard
== discard_sec_merge
)
364 link_info
.discard
= discard_all
;
367 /* If we have not already opened and parsed a linker script,
368 try the default script from command line first. */
369 if (saved_script_handle
== NULL
370 && command_line
.default_script
!= NULL
)
372 ldfile_open_command_file (command_line
.default_script
);
373 parser_input
= input_script
;
377 /* If we have not already opened and parsed a linker script
378 read the emulation's appropriate default script. */
379 if (saved_script_handle
== NULL
)
382 char *s
= ldemul_get_script (&isfile
);
385 ldfile_open_default_command_file (s
);
391 parser_input
= input_script
;
396 if (trace_file_tries
)
398 if (saved_script_handle
)
399 info_msg (_("using external linker script:"));
401 info_msg (_("using internal linker script:"));
402 info_msg ("\n==================================================\n");
404 if (saved_script_handle
)
406 static const int ld_bufsz
= 8193;
408 char *buf
= (char *) xmalloc (ld_bufsz
);
410 rewind (saved_script_handle
);
411 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
416 rewind (saved_script_handle
);
423 info_msg (ldemul_get_script (&isfile
));
426 info_msg ("\n==================================================\n");
431 if (!lang_has_input_file
)
435 einfo (_("%P%F: no input files\n"));
439 info_msg (_("%P: mode %s\n"), emulation
);
441 ldemul_after_parse ();
443 if (config
.map_filename
)
445 if (strcmp (config
.map_filename
, "-") == 0)
447 config
.map_file
= stdout
;
451 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
452 if (config
.map_file
== (FILE *) NULL
)
454 bfd_set_error (bfd_error_system_call
);
455 einfo (_("%P%F: cannot open map file %s: %E\n"),
456 config
.map_filename
);
463 /* Print error messages for any missing symbols, for any warning
464 symbols, and possibly multiple definitions. */
465 if (link_info
.relocatable
)
466 link_info
.output_bfd
->flags
&= ~EXEC_P
;
468 link_info
.output_bfd
->flags
|= EXEC_P
;
472 if (config
.map_file
!= NULL
)
474 if (command_line
.cref
)
475 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
476 if (nocrossref_list
!= NULL
)
477 check_nocrossrefs ();
481 /* Even if we're producing relocatable output, some non-fatal errors should
482 be reported in the exit status. (What non-fatal errors, if any, do we
483 want to ignore for relocatable output?) */
484 if (!config
.make_executable
&& !force_make_executable
)
487 einfo (_("%P: link errors found, deleting executable `%s'\n"),
490 /* The file will be removed by remove_output. */
495 if (! bfd_close (link_info
.output_bfd
))
496 einfo (_("%F%B: final close failed: %E\n"), link_info
.output_bfd
);
498 /* If the --force-exe-suffix is enabled, and we're making an
499 executable file and it doesn't end in .exe, copy it to one
501 if (! link_info
.relocatable
&& command_line
.force_exe_suffix
)
503 int len
= strlen (output_filename
);
506 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
507 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
511 const int bsize
= 4096;
512 char *buf
= (char *) xmalloc (bsize
);
514 char *dst_name
= (char *) xmalloc (len
+ 5);
516 strcpy (dst_name
, output_filename
);
517 strcat (dst_name
, ".exe");
518 src
= fopen (output_filename
, FOPEN_RB
);
519 dst
= fopen (dst_name
, FOPEN_WB
);
522 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
525 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
527 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
529 int done
= fwrite (buf
, 1, l
, dst
);
532 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
536 if (fclose (dst
) == EOF
)
537 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
544 END_PROGRESS (program_name
);
549 char *lim
= (char *) sbrk (0);
551 long run_time
= get_run_time () - start_time
;
554 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
555 program_name
, run_time
/ 1000000, run_time
% 1000000);
557 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
558 (long) (lim
- (char *) &environ
));
563 /* Prevent remove_output from doing anything, after a successful link. */
564 output_filename
= NULL
;
570 /* If the configured sysroot is relocatable, try relocating it based on
571 default prefix FROM. Return the relocated directory if it exists,
572 otherwise return null. */
575 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED
)
577 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
581 path
= make_relative_prefix (program_name
, from
, TARGET_SYSTEM_ROOT
);
584 if (stat (path
, &s
) == 0 && S_ISDIR (s
.st_mode
))
592 /* Return the sysroot directory. Return "" if no sysroot is being used. */
595 get_sysroot (int argc
, char **argv
)
600 for (i
= 1; i
< argc
; i
++)
601 if (CONST_STRNEQ (argv
[i
], "--sysroot="))
602 return argv
[i
] + strlen ("--sysroot=");
604 path
= get_relative_sysroot (BINDIR
);
608 path
= get_relative_sysroot (TOOLBINDIR
);
612 return TARGET_SYSTEM_ROOT
;
615 /* We need to find any explicitly given emulation in order to initialize the
616 state that's needed by the lex&yacc argument parser (parse_args). */
619 get_emulation (int argc
, char **argv
)
624 emulation
= getenv (EMULATION_ENVIRON
);
625 if (emulation
== NULL
)
626 emulation
= DEFAULT_EMULATION
;
628 for (i
= 1; i
< argc
; i
++)
630 if (CONST_STRNEQ (argv
[i
], "-m"))
632 if (argv
[i
][2] == '\0')
637 emulation
= argv
[i
+ 1];
641 einfo (_("%P%F: missing argument to -m\n"));
643 else if (strcmp (argv
[i
], "-mips1") == 0
644 || strcmp (argv
[i
], "-mips2") == 0
645 || strcmp (argv
[i
], "-mips3") == 0
646 || strcmp (argv
[i
], "-mips4") == 0
647 || strcmp (argv
[i
], "-mips5") == 0
648 || strcmp (argv
[i
], "-mips32") == 0
649 || strcmp (argv
[i
], "-mips32r2") == 0
650 || strcmp (argv
[i
], "-mips64") == 0
651 || strcmp (argv
[i
], "-mips64r2") == 0)
653 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
654 passed to the linker by some MIPS compilers. They
655 generally tell the linker to use a slightly different
656 library path. Perhaps someday these should be
657 implemented as emulations; until then, we just ignore
658 the arguments and hope that nobody ever creates
659 emulations named ips1, ips2 or ips3. */
661 else if (strcmp (argv
[i
], "-m486") == 0)
663 /* FIXME: The argument -m486 is passed to the linker on
664 some Linux systems. Hope that nobody creates an
665 emulation named 486. */
670 emulation
= &argv
[i
][2];
679 add_ysym (const char *name
)
681 if (link_info
.notice_hash
== NULL
)
683 link_info
.notice_hash
=
684 (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
685 if (!bfd_hash_table_init_n (link_info
.notice_hash
,
687 sizeof (struct bfd_hash_entry
),
689 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
692 if (bfd_hash_lookup (link_info
.notice_hash
, name
, TRUE
, TRUE
) == NULL
)
693 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
696 /* Record a symbol to be wrapped, from the --wrap option. */
699 add_wrap (const char *name
)
701 if (link_info
.wrap_hash
== NULL
)
703 link_info
.wrap_hash
=
704 (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
705 if (!bfd_hash_table_init_n (link_info
.wrap_hash
,
707 sizeof (struct bfd_hash_entry
),
709 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
712 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, TRUE
, TRUE
) == NULL
)
713 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
716 /* Handle the -retain-symbols-file option. */
719 add_keepsyms_file (const char *filename
)
726 if (link_info
.strip
== strip_some
)
727 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
729 file
= fopen (filename
, "r");
732 bfd_set_error (bfd_error_system_call
);
733 einfo ("%X%P: %s: %E\n", filename
);
737 link_info
.keep_hash
= (struct bfd_hash_table
*)
738 xmalloc (sizeof (struct bfd_hash_table
));
739 if (!bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
,
740 sizeof (struct bfd_hash_entry
)))
741 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
744 buf
= (char *) xmalloc (bufsize
);
756 while (! ISSPACE (c
) && c
!= EOF
)
763 buf
= (char *) xrealloc (buf
, bufsize
);
770 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, TRUE
, TRUE
) == NULL
)
771 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
775 if (link_info
.strip
!= strip_none
)
776 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
779 link_info
.strip
= strip_some
;
782 /* Callbacks from the BFD linker routines. */
784 /* This is called when BFD has decided to include an archive member in
788 add_archive_element (struct bfd_link_info
*info
,
791 bfd
**subsbfd ATTRIBUTE_UNUSED
)
793 lang_input_statement_type
*input
;
794 lang_input_statement_type orig_input
;
796 input
= (lang_input_statement_type
*)
797 xcalloc (1, sizeof (lang_input_statement_type
));
798 input
->filename
= abfd
->filename
;
799 input
->local_sym_name
= abfd
->filename
;
800 input
->the_bfd
= abfd
;
802 /* Save the original data for trace files/tries below, as plugins
803 (if enabled) may possibly alter it to point to a replacement
804 BFD, but we still want to output the original BFD filename. */
806 #ifdef ENABLE_PLUGINS
807 if (bfd_my_archive (abfd
) != NULL
808 && plugin_active_plugins_p ()
809 && !no_more_claiming
)
811 /* We must offer this archive member to the plugins to claim. */
812 int fd
= open (bfd_my_archive (abfd
)->filename
, O_RDONLY
| O_BINARY
);
815 struct ld_plugin_input_file file
;
817 /* Offset and filesize must refer to the individual archive
818 member, not the whole file, and must exclude the header.
819 Fortunately for us, that is how the data is stored in the
820 origin field of the bfd and in the arelt_data. */
821 file
.name
= bfd_my_archive (abfd
)->filename
;
822 file
.offset
= abfd
->origin
;
823 file
.filesize
= arelt_size (abfd
);
825 plugin_maybe_claim (&file
, input
);
828 input
->claim_archive
= TRUE
;
829 *subsbfd
= input
->the_bfd
;
833 #endif /* ENABLE_PLUGINS */
835 ldlang_add_file (input
);
837 if (config
.map_file
!= NULL
)
839 static bfd_boolean header_printed
;
840 struct bfd_link_hash_entry
*h
;
844 h
= bfd_link_hash_lookup (info
->hash
, name
, FALSE
, FALSE
, TRUE
);
856 case bfd_link_hash_defined
:
857 case bfd_link_hash_defweak
:
858 from
= h
->u
.def
.section
->owner
;
861 case bfd_link_hash_undefined
:
862 case bfd_link_hash_undefweak
:
863 from
= h
->u
.undef
.abfd
;
866 case bfd_link_hash_common
:
867 from
= h
->u
.c
.p
->section
->owner
;
872 if (! header_printed
)
876 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
878 header_printed
= TRUE
;
881 if (bfd_my_archive (abfd
) == NULL
)
883 minfo ("%s", bfd_get_filename (abfd
));
884 len
= strlen (bfd_get_filename (abfd
));
888 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
889 bfd_get_filename (abfd
));
890 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
891 + strlen (bfd_get_filename (abfd
))
909 minfo ("(%T)\n", h
->root
.string
);
911 minfo ("(%s)\n", name
);
914 if (trace_files
|| trace_file_tries
)
915 info_msg ("%I\n", &orig_input
);
919 /* This is called when BFD has discovered a symbol which is defined
923 multiple_definition (struct bfd_link_info
*info
,
924 struct bfd_link_hash_entry
*h
,
934 if (info
->allow_multiple_definition
)
939 case bfd_link_hash_defined
:
940 osec
= h
->u
.def
.section
;
941 oval
= h
->u
.def
.value
;
942 obfd
= h
->u
.def
.section
->owner
;
944 case bfd_link_hash_indirect
:
945 osec
= bfd_ind_section_ptr
;
953 /* Ignore a redefinition of an absolute symbol to the
954 same value; it's harmless. */
955 if (h
->type
== bfd_link_hash_defined
956 && bfd_is_abs_section (osec
)
957 && bfd_is_abs_section (nsec
)
961 /* If either section has the output_section field set to
962 bfd_abs_section_ptr, it means that the section is being
963 discarded, and this is not really a multiple definition at all.
964 FIXME: It would be cleaner to somehow ignore symbols defined in
965 sections which are being discarded. */
966 if ((osec
->output_section
!= NULL
967 && ! bfd_is_abs_section (osec
)
968 && bfd_is_abs_section (osec
->output_section
))
969 || (nsec
->output_section
!= NULL
970 && ! bfd_is_abs_section (nsec
)
971 && bfd_is_abs_section (nsec
->output_section
)))
974 name
= h
->root
.string
;
982 einfo (_("%X%C: multiple definition of `%T'\n"),
983 nbfd
, nsec
, nval
, name
);
985 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
987 if (RELAXATION_ENABLED
)
989 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
990 command_line
.disable_target_specific_optimizations
= -1;
996 /* This is called when there is a definition of a common symbol, or
997 when a common symbol is found for a symbol that is already defined,
998 or when two common symbols are found. We only do something if
999 -warn-common was used. */
1002 multiple_common (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1003 struct bfd_link_hash_entry
*h
,
1005 enum bfd_link_hash_type ntype
,
1010 enum bfd_link_hash_type otype
;
1013 if (!config
.warn_common
)
1016 name
= h
->root
.string
;
1018 if (otype
== bfd_link_hash_common
)
1020 obfd
= h
->u
.c
.p
->section
->owner
;
1021 osize
= h
->u
.c
.size
;
1023 else if (otype
== bfd_link_hash_defined
1024 || otype
== bfd_link_hash_defweak
)
1026 obfd
= h
->u
.def
.section
->owner
;
1031 /* FIXME: It would nice if we could report the BFD which defined
1032 an indirect symbol, but we don't have anywhere to store the
1038 if (ntype
== bfd_link_hash_defined
1039 || ntype
== bfd_link_hash_defweak
1040 || ntype
== bfd_link_hash_indirect
)
1042 ASSERT (otype
== bfd_link_hash_common
);
1043 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1046 einfo (_("%B: warning: common is here\n"), obfd
);
1048 else if (otype
== bfd_link_hash_defined
1049 || otype
== bfd_link_hash_defweak
1050 || otype
== bfd_link_hash_indirect
)
1052 ASSERT (ntype
== bfd_link_hash_common
);
1053 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1056 einfo (_("%B: warning: defined here\n"), obfd
);
1060 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
1063 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1066 einfo (_("%B: warning: larger common is here\n"), obfd
);
1068 else if (nsize
> osize
)
1070 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1073 einfo (_("%B: warning: smaller common is here\n"), obfd
);
1077 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
1079 einfo (_("%B: warning: previous common is here\n"), obfd
);
1086 /* This is called when BFD has discovered a set element. H is the
1087 entry in the linker hash table for the set. SECTION and VALUE
1088 represent a value which should be added to the set. */
1091 add_to_set (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1092 struct bfd_link_hash_entry
*h
,
1093 bfd_reloc_code_real_type reloc
,
1098 if (config
.warn_constructors
)
1099 einfo (_("%P: warning: global constructor %s used\n"),
1102 if (! config
.build_constructors
)
1105 ldctor_add_set_entry (h
, reloc
, NULL
, section
, value
);
1107 if (h
->type
== bfd_link_hash_new
)
1109 h
->type
= bfd_link_hash_undefined
;
1110 h
->u
.undef
.abfd
= abfd
;
1111 /* We don't call bfd_link_add_undef to add this to the list of
1112 undefined symbols because we are going to define it
1119 /* This is called when BFD has discovered a constructor. This is only
1120 called for some object file formats--those which do not handle
1121 constructors in some more clever fashion. This is similar to
1122 adding an element to a set, but less general. */
1125 constructor_callback (struct bfd_link_info
*info
,
1126 bfd_boolean constructor
,
1133 struct bfd_link_hash_entry
*h
;
1134 char set_name
[1 + sizeof "__CTOR_LIST__"];
1136 if (config
.warn_constructors
)
1137 einfo (_("%P: warning: global constructor %s used\n"), name
);
1139 if (! config
.build_constructors
)
1142 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1143 useful error message. */
1144 if (bfd_reloc_type_lookup (link_info
.output_bfd
, BFD_RELOC_CTOR
) == NULL
1145 && (info
->relocatable
1146 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1147 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1150 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1151 *s
++ = bfd_get_symbol_leading_char (abfd
);
1153 strcpy (s
, "__CTOR_LIST__");
1155 strcpy (s
, "__DTOR_LIST__");
1157 h
= bfd_link_hash_lookup (info
->hash
, set_name
, TRUE
, TRUE
, TRUE
);
1158 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1159 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1160 if (h
->type
== bfd_link_hash_new
)
1162 h
->type
= bfd_link_hash_undefined
;
1163 h
->u
.undef
.abfd
= abfd
;
1164 /* We don't call bfd_link_add_undef to add this to the list of
1165 undefined symbols because we are going to define it
1169 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1173 /* A structure used by warning_callback to pass information through
1174 bfd_map_over_sections. */
1176 struct warning_callback_info
1179 const char *warning
;
1184 /* This is called when there is a reference to a warning symbol. */
1187 warning_callback (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1188 const char *warning
,
1194 /* This is a hack to support warn_multiple_gp. FIXME: This should
1195 have a cleaner interface, but what? */
1196 if (! config
.warn_multiple_gp
1197 && strcmp (warning
, "using multiple gp values") == 0)
1200 if (section
!= NULL
)
1201 einfo ("%C: %s%s\n", abfd
, section
, address
, _("warning: "), warning
);
1202 else if (abfd
== NULL
)
1203 einfo ("%P: %s%s\n", _("warning: "), warning
);
1204 else if (symbol
== NULL
)
1205 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1208 struct warning_callback_info cinfo
;
1210 /* Look through the relocs to see if we can find a plausible
1213 if (!bfd_generic_link_read_symbols (abfd
))
1214 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1216 cinfo
.found
= FALSE
;
1217 cinfo
.warning
= warning
;
1218 cinfo
.symbol
= symbol
;
1219 cinfo
.asymbols
= bfd_get_outsymbols (abfd
);
1220 bfd_map_over_sections (abfd
, warning_find_reloc
, &cinfo
);
1223 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1229 /* This is called by warning_callback for each section. It checks the
1230 relocs of the section to see if it can find a reference to the
1231 symbol which triggered the warning. If it can, it uses the reloc
1232 to give an error message with a file and line number. */
1235 warning_find_reloc (bfd
*abfd
, asection
*sec
, void *iarg
)
1237 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1241 arelent
**p
, **pend
;
1246 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1248 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1252 relpp
= (arelent
**) xmalloc (relsize
);
1253 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1255 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1258 pend
= p
+ relcount
;
1259 for (; p
< pend
&& *p
!= NULL
; p
++)
1263 if (q
->sym_ptr_ptr
!= NULL
1264 && *q
->sym_ptr_ptr
!= NULL
1265 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1267 /* We found a reloc for the symbol we are looking for. */
1268 einfo ("%C: %s%s\n", abfd
, sec
, q
->address
, _("warning: "),
1278 /* This is called when an undefined symbol is found. */
1281 undefined_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1288 static char *error_name
;
1289 static unsigned int error_count
;
1291 #define MAX_ERRORS_IN_A_ROW 5
1293 if (config
.warn_once
)
1295 static struct bfd_hash_table
*hash
;
1297 /* Only warn once about a particular undefined symbol. */
1300 hash
= (struct bfd_hash_table
*)
1301 xmalloc (sizeof (struct bfd_hash_table
));
1302 if (!bfd_hash_table_init (hash
, bfd_hash_newfunc
,
1303 sizeof (struct bfd_hash_entry
)))
1304 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1307 if (bfd_hash_lookup (hash
, name
, FALSE
, FALSE
) != NULL
)
1310 if (bfd_hash_lookup (hash
, name
, TRUE
, TRUE
) == NULL
)
1311 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1314 /* We never print more than a reasonable number of errors in a row
1315 for a single symbol. */
1316 if (error_name
!= NULL
1317 && strcmp (name
, error_name
) == 0)
1322 if (error_name
!= NULL
)
1324 error_name
= xstrdup (name
);
1327 if (section
!= NULL
)
1329 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1332 einfo (_("%X%C: undefined reference to `%T'\n"),
1333 abfd
, section
, address
, name
);
1335 einfo (_("%C: warning: undefined reference to `%T'\n"),
1336 abfd
, section
, address
, name
);
1338 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1341 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1342 abfd
, section
, address
, name
);
1344 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1345 abfd
, section
, address
, name
);
1352 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1355 einfo (_("%X%B: undefined reference to `%T'\n"),
1358 einfo (_("%B: warning: undefined reference to `%T'\n"),
1361 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1364 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1367 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1377 /* Counter to limit the number of relocation overflow error messages
1378 to print. Errors are printed as it is decremented. When it's
1379 called and the counter is zero, a final message is printed
1380 indicating more relocations were omitted. When it gets to -1, no
1381 such errors are printed. If it's initially set to a value less
1382 than -1, all such errors will be printed (--verbose does this). */
1384 int overflow_cutoff_limit
= 10;
1386 /* This is called when a reloc overflows. */
1389 reloc_overflow (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1390 struct bfd_link_hash_entry
*entry
,
1392 const char *reloc_name
,
1398 if (overflow_cutoff_limit
== -1)
1401 einfo ("%X%C:", abfd
, section
, address
);
1403 if (overflow_cutoff_limit
>= 0
1404 && overflow_cutoff_limit
-- == 0)
1406 einfo (_(" additional relocation overflows omitted from the output\n"));
1412 while (entry
->type
== bfd_link_hash_indirect
1413 || entry
->type
== bfd_link_hash_warning
)
1414 entry
= entry
->u
.i
.link
;
1415 switch (entry
->type
)
1417 case bfd_link_hash_undefined
:
1418 case bfd_link_hash_undefweak
:
1419 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1420 reloc_name
, entry
->root
.string
);
1422 case bfd_link_hash_defined
:
1423 case bfd_link_hash_defweak
:
1424 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1425 reloc_name
, entry
->root
.string
,
1426 entry
->u
.def
.section
,
1427 entry
->u
.def
.section
== bfd_abs_section_ptr
1428 ? link_info
.output_bfd
: entry
->u
.def
.section
->owner
);
1436 einfo (_(" relocation truncated to fit: %s against `%T'"),
1439 einfo ("+%v", addend
);
1444 /* This is called when a dangerous relocation is made. */
1447 reloc_dangerous (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1448 const char *message
,
1453 einfo (_("%X%C: dangerous relocation: %s\n"),
1454 abfd
, section
, address
, message
);
1458 /* This is called when a reloc is being generated attached to a symbol
1459 that is not being output. */
1462 unattached_reloc (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1468 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1469 abfd
, section
, address
, name
);
1473 /* This is called if link_info.notice_all is set, or when a symbol in
1474 link_info.notice_hash is found. Symbols are put in notice_hash
1475 using the -y option, while notice_all is set if the --cref option
1476 has been supplied, or if there are any NOCROSSREFS sections in the
1477 linker script; and if plugins are active, since they need to monitor
1478 all references from non-IR files. */
1481 notice (struct bfd_link_info
*info
,
1489 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1490 return handle_asneeded_cref (abfd
, (enum notice_asneeded_action
) value
);
1494 if (info
->notice_hash
!= NULL
1495 && bfd_hash_lookup (info
->notice_hash
, name
, FALSE
, FALSE
) != NULL
)
1497 if (bfd_is_und_section (section
))
1498 einfo ("%B: reference to %s\n", abfd
, name
);
1500 einfo ("%B: definition of %s\n", abfd
, name
);
1503 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1504 add_cref (name
, abfd
, section
, value
);