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
= TRUE
;
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
.relax
)
296 einfo (_("%P%F: --relax and -r may not be used together\n"));
297 if (link_info
.shared
)
298 einfo (_("%P%F: -r and -shared may not be used together\n"));
301 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
302 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
303 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
304 for shared libraries. -Bsymbolic overrides all others and vice
306 switch (command_line
.symbolic
)
311 /* -Bsymbolic is for shared library only. */
312 if (link_info
.shared
)
314 link_info
.symbolic
= TRUE
;
315 /* Should we free the unused memory? */
316 link_info
.dynamic_list
= NULL
;
317 command_line
.dynamic_list
= dynamic_list_unset
;
320 case symbolic_functions
:
321 /* -Bsymbolic-functions is for shared library only. */
322 if (link_info
.shared
)
323 command_line
.dynamic_list
= dynamic_list_data
;
327 switch (command_line
.dynamic_list
)
329 case dynamic_list_unset
:
331 case dynamic_list_data
:
332 link_info
.dynamic_data
= TRUE
;
334 link_info
.dynamic
= TRUE
;
338 if (! link_info
.shared
)
340 if (command_line
.filter_shlib
)
341 einfo (_("%P%F: -F may not be used without -shared\n"));
342 if (command_line
.auxiliary_filters
)
343 einfo (_("%P%F: -f may not be used without -shared\n"));
346 if (! link_info
.shared
|| link_info
.pie
)
347 link_info
.executable
= TRUE
;
349 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
350 don't see how else this can be handled, since in this case we
351 must preserve all externally visible symbols. */
352 if (link_info
.relocatable
&& link_info
.strip
== strip_all
)
354 link_info
.strip
= strip_debugger
;
355 if (link_info
.discard
== discard_sec_merge
)
356 link_info
.discard
= discard_all
;
359 /* If we have not already opened and parsed a linker script,
360 try the default script from command line first. */
361 if (saved_script_handle
== NULL
362 && command_line
.default_script
!= NULL
)
364 ldfile_open_command_file (command_line
.default_script
);
365 parser_input
= input_script
;
369 /* If we have not already opened and parsed a linker script
370 read the emulation's appropriate default script. */
371 if (saved_script_handle
== NULL
)
374 char *s
= ldemul_get_script (&isfile
);
377 ldfile_open_command_file (s
);
383 parser_input
= input_script
;
388 if (trace_file_tries
)
390 if (saved_script_handle
)
391 info_msg (_("using external linker script:"));
393 info_msg (_("using internal linker script:"));
394 info_msg ("\n==================================================\n");
396 if (saved_script_handle
)
398 static const int ld_bufsz
= 8193;
400 char *buf
= xmalloc (ld_bufsz
);
402 rewind (saved_script_handle
);
403 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
408 rewind (saved_script_handle
);
415 info_msg (ldemul_get_script (&isfile
));
418 info_msg ("\n==================================================\n");
423 if (!lang_has_input_file
)
427 einfo (_("%P%F: no input files\n"));
431 info_msg (_("%P: mode %s\n"), emulation
);
433 ldemul_after_parse ();
435 if (config
.map_filename
)
437 if (strcmp (config
.map_filename
, "-") == 0)
439 config
.map_file
= stdout
;
443 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
444 if (config
.map_file
== (FILE *) NULL
)
446 bfd_set_error (bfd_error_system_call
);
447 einfo (_("%P%F: cannot open map file %s: %E\n"),
448 config
.map_filename
);
455 /* Print error messages for any missing symbols, for any warning
456 symbols, and possibly multiple definitions. */
457 if (link_info
.relocatable
)
458 link_info
.output_bfd
->flags
&= ~EXEC_P
;
460 link_info
.output_bfd
->flags
|= EXEC_P
;
464 if (config
.map_file
!= NULL
)
466 if (command_line
.cref
)
467 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
468 if (nocrossref_list
!= NULL
)
469 check_nocrossrefs ();
473 /* Even if we're producing relocatable output, some non-fatal errors should
474 be reported in the exit status. (What non-fatal errors, if any, do we
475 want to ignore for relocatable output?) */
476 if (!config
.make_executable
&& !force_make_executable
)
479 einfo (_("%P: link errors found, deleting executable `%s'\n"),
482 /* The file will be removed by remove_output. */
487 if (! bfd_close (link_info
.output_bfd
))
488 einfo (_("%F%B: final close failed: %E\n"), link_info
.output_bfd
);
490 /* If the --force-exe-suffix is enabled, and we're making an
491 executable file and it doesn't end in .exe, copy it to one
493 if (! link_info
.relocatable
&& command_line
.force_exe_suffix
)
495 int len
= strlen (output_filename
);
498 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
499 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
503 const int bsize
= 4096;
504 char *buf
= xmalloc (bsize
);
506 char *dst_name
= xmalloc (len
+ 5);
508 strcpy (dst_name
, output_filename
);
509 strcat (dst_name
, ".exe");
510 src
= fopen (output_filename
, FOPEN_RB
);
511 dst
= fopen (dst_name
, FOPEN_WB
);
514 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
517 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
519 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
521 int done
= fwrite (buf
, 1, l
, dst
);
524 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
528 if (fclose (dst
) == EOF
)
529 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
536 END_PROGRESS (program_name
);
541 char *lim
= sbrk (0);
543 long run_time
= get_run_time () - start_time
;
545 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
546 program_name
, run_time
/ 1000000, run_time
% 1000000);
548 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
549 (long) (lim
- (char *) &environ
));
553 /* Prevent remove_output from doing anything, after a successful link. */
554 output_filename
= NULL
;
560 /* If the configured sysroot is relocatable, try relocating it based on
561 default prefix FROM. Return the relocated directory if it exists,
562 otherwise return null. */
565 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED
)
567 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
571 path
= make_relative_prefix (program_name
, from
, TARGET_SYSTEM_ROOT
);
574 if (stat (path
, &s
) == 0 && S_ISDIR (s
.st_mode
))
582 /* Return the sysroot directory. Return "" if no sysroot is being used. */
585 get_sysroot (int argc
, char **argv
)
590 for (i
= 1; i
< argc
; i
++)
591 if (CONST_STRNEQ (argv
[i
], "--sysroot="))
592 return argv
[i
] + strlen ("--sysroot=");
594 path
= get_relative_sysroot (BINDIR
);
598 path
= get_relative_sysroot (TOOLBINDIR
);
602 return TARGET_SYSTEM_ROOT
;
605 /* We need to find any explicitly given emulation in order to initialize the
606 state that's needed by the lex&yacc argument parser (parse_args). */
609 get_emulation (int argc
, char **argv
)
614 emulation
= getenv (EMULATION_ENVIRON
);
615 if (emulation
== NULL
)
616 emulation
= DEFAULT_EMULATION
;
618 for (i
= 1; i
< argc
; i
++)
620 if (CONST_STRNEQ (argv
[i
], "-m"))
622 if (argv
[i
][2] == '\0')
627 emulation
= argv
[i
+ 1];
631 einfo (_("%P%F: missing argument to -m\n"));
633 else if (strcmp (argv
[i
], "-mips1") == 0
634 || strcmp (argv
[i
], "-mips2") == 0
635 || strcmp (argv
[i
], "-mips3") == 0
636 || strcmp (argv
[i
], "-mips4") == 0
637 || strcmp (argv
[i
], "-mips5") == 0
638 || strcmp (argv
[i
], "-mips32") == 0
639 || strcmp (argv
[i
], "-mips32r2") == 0
640 || strcmp (argv
[i
], "-mips64") == 0
641 || strcmp (argv
[i
], "-mips64r2") == 0)
643 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
644 passed to the linker by some MIPS compilers. They
645 generally tell the linker to use a slightly different
646 library path. Perhaps someday these should be
647 implemented as emulations; until then, we just ignore
648 the arguments and hope that nobody ever creates
649 emulations named ips1, ips2 or ips3. */
651 else if (strcmp (argv
[i
], "-m486") == 0)
653 /* FIXME: The argument -m486 is passed to the linker on
654 some Linux systems. Hope that nobody creates an
655 emulation named 486. */
660 emulation
= &argv
[i
][2];
669 add_ysym (const char *name
)
671 if (link_info
.notice_hash
== NULL
)
673 link_info
.notice_hash
= xmalloc (sizeof (struct bfd_hash_table
));
674 if (!bfd_hash_table_init_n (link_info
.notice_hash
,
676 sizeof (struct bfd_hash_entry
),
678 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
681 if (bfd_hash_lookup (link_info
.notice_hash
, name
, TRUE
, TRUE
) == NULL
)
682 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
685 /* Record a symbol to be wrapped, from the --wrap option. */
688 add_wrap (const char *name
)
690 if (link_info
.wrap_hash
== NULL
)
692 link_info
.wrap_hash
= xmalloc (sizeof (struct bfd_hash_table
));
693 if (!bfd_hash_table_init_n (link_info
.wrap_hash
,
695 sizeof (struct bfd_hash_entry
),
697 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
700 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, TRUE
, TRUE
) == NULL
)
701 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
704 /* Handle the -retain-symbols-file option. */
707 add_keepsyms_file (const char *filename
)
714 if (link_info
.strip
== strip_some
)
715 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
717 file
= fopen (filename
, "r");
720 bfd_set_error (bfd_error_system_call
);
721 einfo ("%X%P: %s: %E\n", filename
);
725 link_info
.keep_hash
= 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
= xmalloc (bufsize
);
743 while (! ISSPACE (c
) && c
!= EOF
)
750 buf
= 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
;
769 /* Callbacks from the BFD linker routines. */
771 /* This is called when BFD has decided to include an archive member in
775 add_archive_element (struct bfd_link_info
*info
,
779 lang_input_statement_type
*input
;
781 input
= xmalloc (sizeof (lang_input_statement_type
));
782 input
->filename
= abfd
->filename
;
783 input
->local_sym_name
= abfd
->filename
;
784 input
->the_bfd
= abfd
;
785 input
->asymbols
= NULL
;
787 input
->just_syms_flag
= FALSE
;
788 input
->loaded
= FALSE
;
789 input
->search_dirs_flag
= FALSE
;
791 /* FIXME: The following fields are not set: header.next,
792 header.type, closed, passive_position, symbol_count,
793 next_real_file, is_archive, target, real. This bit of code is
794 from the old decode_library_subfile function. I don't know
795 whether any of those fields matters. */
797 ldlang_add_file (input
);
799 if (config
.map_file
!= NULL
)
801 static bfd_boolean header_printed
;
802 struct bfd_link_hash_entry
*h
;
806 h
= bfd_link_hash_lookup (info
->hash
, name
, FALSE
, FALSE
, TRUE
);
818 case bfd_link_hash_defined
:
819 case bfd_link_hash_defweak
:
820 from
= h
->u
.def
.section
->owner
;
823 case bfd_link_hash_undefined
:
824 case bfd_link_hash_undefweak
:
825 from
= h
->u
.undef
.abfd
;
828 case bfd_link_hash_common
:
829 from
= h
->u
.c
.p
->section
->owner
;
834 if (! header_printed
)
838 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
840 header_printed
= TRUE
;
843 if (bfd_my_archive (abfd
) == NULL
)
845 minfo ("%s", bfd_get_filename (abfd
));
846 len
= strlen (bfd_get_filename (abfd
));
850 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
851 bfd_get_filename (abfd
));
852 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
853 + strlen (bfd_get_filename (abfd
))
871 minfo ("(%T)\n", h
->root
.string
);
873 minfo ("(%s)\n", name
);
876 if (trace_files
|| trace_file_tries
)
877 info_msg ("%I\n", input
);
882 /* This is called when BFD has discovered a symbol which is defined
886 multiple_definition (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
895 /* If either section has the output_section field set to
896 bfd_abs_section_ptr, it means that the section is being
897 discarded, and this is not really a multiple definition at all.
898 FIXME: It would be cleaner to somehow ignore symbols defined in
899 sections which are being discarded. */
900 if ((osec
->output_section
!= NULL
901 && ! bfd_is_abs_section (osec
)
902 && bfd_is_abs_section (osec
->output_section
))
903 || (nsec
->output_section
!= NULL
904 && ! bfd_is_abs_section (nsec
)
905 && bfd_is_abs_section (nsec
->output_section
)))
908 einfo (_("%X%C: multiple definition of `%T'\n"),
909 nbfd
, nsec
, nval
, name
);
911 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
913 if (command_line
.relax
)
915 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
916 command_line
.relax
= 0;
922 /* This is called when there is a definition of a common symbol, or
923 when a common symbol is found for a symbol that is already defined,
924 or when two common symbols are found. We only do something if
925 -warn-common was used. */
928 multiple_common (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
931 enum bfd_link_hash_type otype
,
934 enum bfd_link_hash_type ntype
,
937 if (! config
.warn_common
)
940 if (ntype
== bfd_link_hash_defined
941 || ntype
== bfd_link_hash_defweak
942 || ntype
== bfd_link_hash_indirect
)
944 ASSERT (otype
== bfd_link_hash_common
);
945 einfo (_("%B: warning: definition of `%T' overriding common\n"),
948 einfo (_("%B: warning: common is here\n"), obfd
);
950 else if (otype
== bfd_link_hash_defined
951 || otype
== bfd_link_hash_defweak
952 || otype
== bfd_link_hash_indirect
)
954 ASSERT (ntype
== bfd_link_hash_common
);
955 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
958 einfo (_("%B: warning: defined here\n"), obfd
);
962 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
965 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
968 einfo (_("%B: warning: larger common is here\n"), obfd
);
970 else if (nsize
> osize
)
972 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
975 einfo (_("%B: warning: smaller common is here\n"), obfd
);
979 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
981 einfo (_("%B: warning: previous common is here\n"), obfd
);
988 /* This is called when BFD has discovered a set element. H is the
989 entry in the linker hash table for the set. SECTION and VALUE
990 represent a value which should be added to the set. */
993 add_to_set (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
994 struct bfd_link_hash_entry
*h
,
995 bfd_reloc_code_real_type reloc
,
1000 if (config
.warn_constructors
)
1001 einfo (_("%P: warning: global constructor %s used\n"),
1004 if (! config
.build_constructors
)
1007 ldctor_add_set_entry (h
, reloc
, NULL
, section
, value
);
1009 if (h
->type
== bfd_link_hash_new
)
1011 h
->type
= bfd_link_hash_undefined
;
1012 h
->u
.undef
.abfd
= abfd
;
1013 /* We don't call bfd_link_add_undef to add this to the list of
1014 undefined symbols because we are going to define it
1021 /* This is called when BFD has discovered a constructor. This is only
1022 called for some object file formats--those which do not handle
1023 constructors in some more clever fashion. This is similar to
1024 adding an element to a set, but less general. */
1027 constructor_callback (struct bfd_link_info
*info
,
1028 bfd_boolean constructor
,
1035 struct bfd_link_hash_entry
*h
;
1036 char set_name
[1 + sizeof "__CTOR_LIST__"];
1038 if (config
.warn_constructors
)
1039 einfo (_("%P: warning: global constructor %s used\n"), name
);
1041 if (! config
.build_constructors
)
1044 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1045 useful error message. */
1046 if (bfd_reloc_type_lookup (link_info
.output_bfd
, BFD_RELOC_CTOR
) == NULL
1047 && (info
->relocatable
1048 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1049 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1052 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1053 *s
++ = bfd_get_symbol_leading_char (abfd
);
1055 strcpy (s
, "__CTOR_LIST__");
1057 strcpy (s
, "__DTOR_LIST__");
1059 h
= bfd_link_hash_lookup (info
->hash
, set_name
, TRUE
, TRUE
, TRUE
);
1060 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1061 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1062 if (h
->type
== bfd_link_hash_new
)
1064 h
->type
= bfd_link_hash_undefined
;
1065 h
->u
.undef
.abfd
= abfd
;
1066 /* We don't call bfd_link_add_undef to add this to the list of
1067 undefined symbols because we are going to define it
1071 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1075 /* A structure used by warning_callback to pass information through
1076 bfd_map_over_sections. */
1078 struct warning_callback_info
1081 const char *warning
;
1086 /* This is called when there is a reference to a warning symbol. */
1089 warning_callback (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1090 const char *warning
,
1096 /* This is a hack to support warn_multiple_gp. FIXME: This should
1097 have a cleaner interface, but what? */
1098 if (! config
.warn_multiple_gp
1099 && strcmp (warning
, "using multiple gp values") == 0)
1102 if (section
!= NULL
)
1103 einfo ("%C: %s%s\n", abfd
, section
, address
, _("warning: "), warning
);
1104 else if (abfd
== NULL
)
1105 einfo ("%P: %s%s\n", _("warning: "), warning
);
1106 else if (symbol
== NULL
)
1107 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1110 lang_input_statement_type
*entry
;
1112 struct warning_callback_info info
;
1114 /* Look through the relocs to see if we can find a plausible
1116 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1117 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1118 asymbols
= entry
->asymbols
;
1124 symsize
= bfd_get_symtab_upper_bound (abfd
);
1126 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1127 asymbols
= xmalloc (symsize
);
1128 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1129 if (symbol_count
< 0)
1130 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1133 entry
->asymbols
= asymbols
;
1134 entry
->symbol_count
= symbol_count
;
1139 info
.warning
= warning
;
1140 info
.symbol
= symbol
;
1141 info
.asymbols
= asymbols
;
1142 bfd_map_over_sections (abfd
, warning_find_reloc
, &info
);
1145 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1154 /* This is called by warning_callback for each section. It checks the
1155 relocs of the section to see if it can find a reference to the
1156 symbol which triggered the warning. If it can, it uses the reloc
1157 to give an error message with a file and line number. */
1160 warning_find_reloc (bfd
*abfd
, asection
*sec
, void *iarg
)
1162 struct warning_callback_info
*info
= iarg
;
1166 arelent
**p
, **pend
;
1171 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1173 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1177 relpp
= xmalloc (relsize
);
1178 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1180 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1183 pend
= p
+ relcount
;
1184 for (; p
< pend
&& *p
!= NULL
; p
++)
1188 if (q
->sym_ptr_ptr
!= NULL
1189 && *q
->sym_ptr_ptr
!= NULL
1190 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1192 /* We found a reloc for the symbol we are looking for. */
1193 einfo ("%C: %s%s\n", abfd
, sec
, q
->address
, _("warning: "),
1203 /* This is called when an undefined symbol is found. */
1206 undefined_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1213 static char *error_name
;
1214 static unsigned int error_count
;
1216 #define MAX_ERRORS_IN_A_ROW 5
1218 if (config
.warn_once
)
1220 static struct bfd_hash_table
*hash
;
1222 /* Only warn once about a particular undefined symbol. */
1225 hash
= xmalloc (sizeof (struct bfd_hash_table
));
1226 if (!bfd_hash_table_init (hash
, bfd_hash_newfunc
,
1227 sizeof (struct bfd_hash_entry
)))
1228 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1231 if (bfd_hash_lookup (hash
, name
, FALSE
, FALSE
) != NULL
)
1234 if (bfd_hash_lookup (hash
, name
, TRUE
, TRUE
) == NULL
)
1235 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1238 /* We never print more than a reasonable number of errors in a row
1239 for a single symbol. */
1240 if (error_name
!= NULL
1241 && strcmp (name
, error_name
) == 0)
1246 if (error_name
!= NULL
)
1248 error_name
= xstrdup (name
);
1251 if (section
!= NULL
)
1253 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1256 einfo (_("%X%C: undefined reference to `%T'\n"),
1257 abfd
, section
, address
, name
);
1259 einfo (_("%C: warning: undefined reference to `%T'\n"),
1260 abfd
, section
, address
, name
);
1262 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1265 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1266 abfd
, section
, address
, name
);
1268 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1269 abfd
, section
, address
, name
);
1276 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1279 einfo (_("%X%B: undefined reference to `%T'\n"),
1282 einfo (_("%B: warning: undefined reference to `%T'\n"),
1285 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1288 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1291 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1301 /* Counter to limit the number of relocation overflow error messages
1302 to print. Errors are printed as it is decremented. When it's
1303 called and the counter is zero, a final message is printed
1304 indicating more relocations were omitted. When it gets to -1, no
1305 such errors are printed. If it's initially set to a value less
1306 than -1, all such errors will be printed (--verbose does this). */
1308 int overflow_cutoff_limit
= 10;
1310 /* This is called when a reloc overflows. */
1313 reloc_overflow (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1314 struct bfd_link_hash_entry
*entry
,
1316 const char *reloc_name
,
1322 if (overflow_cutoff_limit
== -1)
1325 einfo ("%X%C:", abfd
, section
, address
);
1327 if (overflow_cutoff_limit
>= 0
1328 && overflow_cutoff_limit
-- == 0)
1330 einfo (_(" additional relocation overflows omitted from the output\n"));
1336 while (entry
->type
== bfd_link_hash_indirect
1337 || entry
->type
== bfd_link_hash_warning
)
1338 entry
= entry
->u
.i
.link
;
1339 switch (entry
->type
)
1341 case bfd_link_hash_undefined
:
1342 case bfd_link_hash_undefweak
:
1343 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1344 reloc_name
, entry
->root
.string
);
1346 case bfd_link_hash_defined
:
1347 case bfd_link_hash_defweak
:
1348 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1349 reloc_name
, entry
->root
.string
,
1350 entry
->u
.def
.section
,
1351 entry
->u
.def
.section
== bfd_abs_section_ptr
1352 ? link_info
.output_bfd
: entry
->u
.def
.section
->owner
);
1360 einfo (_(" relocation truncated to fit: %s against `%T'"),
1363 einfo ("+%v", addend
);
1368 /* This is called when a dangerous relocation is made. */
1371 reloc_dangerous (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1372 const char *message
,
1377 einfo (_("%X%C: dangerous relocation: %s\n"),
1378 abfd
, section
, address
, message
);
1382 /* This is called when a reloc is being generated attached to a symbol
1383 that is not being output. */
1386 unattached_reloc (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1392 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1393 abfd
, section
, address
, name
);
1397 /* This is called if link_info.notice_all is set, or when a symbol in
1398 link_info.notice_hash is found. Symbols are put in notice_hash
1399 using the -y option. */
1402 notice (struct bfd_link_info
*info
,
1410 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1411 return handle_asneeded_cref (abfd
, value
);
1415 if (! info
->notice_all
1416 || (info
->notice_hash
!= NULL
1417 && bfd_hash_lookup (info
->notice_hash
, name
, FALSE
, FALSE
) != NULL
))
1419 if (bfd_is_und_section (section
))
1420 einfo ("%B: reference to %s\n", abfd
, name
);
1422 einfo ("%B: definition of %s\n", abfd
, name
);
1425 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1426 add_cref (name
, abfd
, section
, value
);