1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
3 Free Software Foundation, Inc.
4 Written by Steve Chamberlain steve@cygnus.com
6 This file is part of GLD, the Gnu Linker.
8 GLD is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GLD is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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)
52 #ifdef NEED_DECLARATION_SBRK
57 static char *get_emulation
PARAMS ((int, char **));
58 static void set_scripts_dir
PARAMS ((void));
63 const char *output_filename
= "a.out";
65 /* Name this program was invoked by. */
68 /* The file that we're creating. */
71 /* Set by -G argument, for MIPS ECOFF target. */
72 int g_switch_value
= 8;
74 /* Nonzero means print names of input files as processed. */
77 /* Nonzero means same, but note open failures, too. */
78 boolean trace_file_tries
;
80 /* Nonzero means version number was printed, so exit successfully
81 instead of complaining if no input files are given. */
82 boolean version_printed
;
84 /* Nonzero means link in every member of an archive. */
85 boolean whole_archive
;
87 /* True if we should demangle symbol names. */
90 args_type command_line
;
92 ld_config_type config
;
94 static void remove_output
PARAMS ((void));
95 static boolean check_for_scripts_dir
PARAMS ((char *dir
));
96 static boolean add_archive_element
PARAMS ((struct bfd_link_info
*, bfd
*,
98 static boolean multiple_definition
PARAMS ((struct bfd_link_info
*,
100 bfd
*, asection
*, bfd_vma
,
101 bfd
*, asection
*, bfd_vma
));
102 static boolean multiple_common
PARAMS ((struct bfd_link_info
*,
104 enum bfd_link_hash_type
, bfd_vma
,
105 bfd
*, enum bfd_link_hash_type
,
107 static boolean add_to_set
PARAMS ((struct bfd_link_info
*,
108 struct bfd_link_hash_entry
*,
109 bfd_reloc_code_real_type
,
110 bfd
*, asection
*, bfd_vma
));
111 static boolean constructor_callback
PARAMS ((struct bfd_link_info
*,
114 bfd
*, asection
*, bfd_vma
));
115 static boolean warning_callback
PARAMS ((struct bfd_link_info
*,
116 const char *, const char *, bfd
*,
117 asection
*, bfd_vma
));
118 static void warning_find_reloc
PARAMS ((bfd
*, asection
*, PTR
));
119 static boolean undefined_symbol
PARAMS ((struct bfd_link_info
*,
121 asection
*, bfd_vma
, boolean
));
122 static boolean reloc_overflow
PARAMS ((struct bfd_link_info
*, const char *,
123 const char *, bfd_vma
,
124 bfd
*, asection
*, bfd_vma
));
125 static boolean reloc_dangerous
PARAMS ((struct bfd_link_info
*, const char *,
126 bfd
*, asection
*, bfd_vma
));
127 static boolean unattached_reloc
PARAMS ((struct bfd_link_info
*,
128 const char *, bfd
*, asection
*,
130 static boolean notice
PARAMS ((struct bfd_link_info
*, const char *,
131 bfd
*, asection
*, bfd_vma
));
133 static struct bfd_link_callbacks link_callbacks
= {
138 constructor_callback
,
147 struct bfd_link_info link_info
;
154 if (output_bfd
&& output_bfd
->iostream
)
155 fclose ((FILE *) (output_bfd
->iostream
));
156 if (delete_output_file_on_failure
)
157 unlink (output_filename
);
167 long start_time
= get_run_time ();
169 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
170 setlocale (LC_MESSAGES
, "");
172 #if defined (HAVE_SETLOCALE)
173 setlocale (LC_CTYPE
, "");
175 bindtextdomain (PACKAGE
, LOCALEDIR
);
176 textdomain (PACKAGE
);
178 program_name
= argv
[0];
179 xmalloc_set_program_name (program_name
);
181 START_PROGRESS (program_name
, 0);
185 bfd_set_error_program_name (program_name
);
187 xatexit (remove_output
);
189 /* Set the default BFD target based on the configured target. Doing
190 this permits the linker to be configured for a particular target,
191 and linked against a shared BFD library which was configured for
192 a different target. The macro TARGET is defined by Makefile. */
193 if (! bfd_set_default_target (TARGET
))
195 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
206 /* Initialize the data about options. */
207 trace_files
= trace_file_tries
= version_printed
= false;
208 whole_archive
= false;
209 config
.build_constructors
= true;
210 config
.dynamic_link
= false;
211 config
.has_shared
= false;
212 config
.split_by_reloc
= (unsigned) -1;
213 config
.split_by_file
= (bfd_size_type
) -1;
214 command_line
.force_common_definition
= false;
215 command_line
.inhibit_common_definition
= false;
216 command_line
.interpreter
= NULL
;
217 command_line
.rpath
= NULL
;
218 command_line
.warn_mismatch
= true;
219 command_line
.check_section_addresses
= true;
221 /* We initialize DEMANGLING based on the environment variable
222 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
223 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
224 environment. Acting the same way here lets us provide the same
225 interface by default. */
226 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
228 link_info
.callbacks
= &link_callbacks
;
229 link_info
.relocateable
= false;
230 link_info
.emitrelocations
= false;
231 link_info
.shared
= false;
232 link_info
.symbolic
= false;
233 link_info
.export_dynamic
= false;
234 link_info
.static_link
= false;
235 link_info
.traditional_format
= false;
236 link_info
.optimize
= false;
237 link_info
.no_undefined
= false;
238 link_info
.allow_shlib_undefined
= false;
239 link_info
.strip
= strip_none
;
240 link_info
.discard
= discard_sec_merge
;
241 link_info
.keep_memory
= true;
242 link_info
.input_bfds
= NULL
;
243 link_info
.create_object_symbols_section
= NULL
;
244 link_info
.hash
= NULL
;
245 link_info
.keep_hash
= NULL
;
246 link_info
.notice_all
= false;
247 link_info
.notice_hash
= NULL
;
248 link_info
.wrap_hash
= NULL
;
249 link_info
.mpc860c0
= 0;
250 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
251 and _fini symbols. We are compatible. */
252 link_info
.init_function
= "_init";
253 link_info
.fini_function
= "_fini";
254 link_info
.new_dtags
= false;
255 link_info
.eh_frame_hdr
= false;
256 link_info
.flags
= (bfd_vma
) 0;
257 link_info
.flags_1
= (bfd_vma
) 0;
258 link_info
.pei386_auto_import
= false;
259 link_info
.combreloc
= false;
260 link_info
.spare_dynamic_tags
= 5;
262 ldfile_add_arch ("");
264 config
.make_executable
= true;
265 force_make_executable
= false;
266 config
.magic_demand_paged
= true;
267 config
.text_read_only
= true;
269 emulation
= get_emulation (argc
, argv
);
270 ldemul_choose_mode (emulation
);
271 default_target
= ldemul_choose_target (argc
, argv
);
273 ldemul_before_parse ();
274 lang_has_input_file
= false;
275 parse_args (argc
, argv
);
277 ldemul_set_symbols ();
279 if (link_info
.relocateable
)
281 if (command_line
.gc_sections
)
282 einfo ("%P%F: --gc-sections and -r may not be used together\n");
283 if (link_info
.mpc860c0
)
284 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
285 else if (command_line
.relax
)
286 einfo (_("%P%F: --relax and -r may not be used together\n"));
287 if (link_info
.shared
)
288 einfo (_("%P%F: -r and -shared may not be used together\n"));
291 if (! link_info
.shared
)
293 if (command_line
.filter_shlib
)
294 einfo (_("%P%F: -F may not be used without -shared\n"));
295 if (command_line
.auxiliary_filters
)
296 einfo (_("%P%F: -f may not be used without -shared\n"));
299 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
300 don't see how else this can be handled, since in this case we
301 must preserve all externally visible symbols. */
302 if (link_info
.relocateable
&& link_info
.strip
== strip_all
)
304 link_info
.strip
= strip_debugger
;
305 if (link_info
.discard
== discard_sec_merge
)
306 link_info
.discard
= discard_all
;
309 /* This essentially adds another -L directory so this must be done after
310 the -L's in argv have been processed. */
313 /* If we have not already opened and parsed a linker script
314 read the emulation's appropriate default script. */
315 if (saved_script_handle
== NULL
)
318 char *s
= ldemul_get_script (& isfile
);
321 ldfile_open_command_file (s
);
327 parser_input
= input_script
;
332 if (trace_file_tries
)
334 if (saved_script_handle
)
335 info_msg (_("using external linker script:"));
337 info_msg (_("using internal linker script:"));
338 info_msg ("\n==================================================\n");
340 if (saved_script_handle
)
342 static const int ld_bufsz
= 8193;
344 char *buf
= xmalloc (ld_bufsz
);
346 rewind (saved_script_handle
);
347 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
352 rewind (saved_script_handle
);
359 info_msg (ldemul_get_script (& isfile
));
362 info_msg ("\n==================================================\n");
367 if (lang_has_input_file
== false)
371 einfo (_("%P%F: no input files\n"));
376 info_msg (_("%P: mode %s\n"), emulation
);
379 ldemul_after_parse ();
381 if (config
.map_filename
)
383 if (strcmp (config
.map_filename
, "-") == 0)
385 config
.map_file
= stdout
;
389 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
390 if (config
.map_file
== (FILE *) NULL
)
392 bfd_set_error (bfd_error_system_call
);
393 einfo (_("%P%F: cannot open map file %s: %E\n"),
394 config
.map_filename
);
401 /* Print error messages for any missing symbols, for any warning
402 symbols, and possibly multiple definitions. */
404 if (! link_info
.relocateable
)
406 /* Look for a text section and switch the readonly attribute in it. */
407 asection
*found
= bfd_get_section_by_name (output_bfd
, ".text");
409 if (found
!= (asection
*) NULL
)
411 if (config
.text_read_only
)
412 found
->flags
|= SEC_READONLY
;
414 found
->flags
&= ~SEC_READONLY
;
418 if (link_info
.relocateable
)
419 output_bfd
->flags
&= ~EXEC_P
;
421 output_bfd
->flags
|= EXEC_P
;
425 if (config
.map_file
!= NULL
)
427 if (command_line
.cref
)
428 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
429 if (nocrossref_list
!= NULL
)
430 check_nocrossrefs ();
432 /* Even if we're producing relocateable output, some non-fatal errors should
433 be reported in the exit status. (What non-fatal errors, if any, do we
434 want to ignore for relocateable output?) */
436 if (config
.make_executable
== false && force_make_executable
== false)
438 if (trace_files
== true)
440 einfo (_("%P: link errors found, deleting executable `%s'\n"),
444 /* The file will be removed by remove_output. */
450 if (! bfd_close (output_bfd
))
451 einfo (_("%F%B: final close failed: %E\n"), output_bfd
);
453 /* If the --force-exe-suffix is enabled, and we're making an
454 executable file and it doesn't end in .exe, copy it to one
456 if (! link_info
.relocateable
&& command_line
.force_exe_suffix
)
458 int len
= strlen (output_filename
);
460 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
461 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
465 const int bsize
= 4096;
466 char *buf
= xmalloc (bsize
);
468 char *dst_name
= xmalloc (len
+ 5);
469 strcpy (dst_name
, output_filename
);
470 strcat (dst_name
, ".exe");
471 src
= fopen (output_filename
, FOPEN_RB
);
472 dst
= fopen (dst_name
, FOPEN_WB
);
475 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename
);
477 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name
);
478 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
480 int done
= fwrite (buf
, 1, l
, dst
);
483 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
487 if (fclose (dst
) == EOF
)
489 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
497 END_PROGRESS (program_name
);
502 char *lim
= (char *) sbrk (0);
504 long run_time
= get_run_time () - start_time
;
506 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
507 program_name
, run_time
/ 1000000, run_time
% 1000000);
509 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
510 (long) (lim
- (char *) &environ
));
514 /* Prevent remove_output from doing anything, after a successful link. */
515 output_filename
= NULL
;
521 /* We need to find any explicitly given emulation in order to initialize the
522 state that's needed by the lex&yacc argument parser (parse_args). */
525 get_emulation (argc
, argv
)
532 emulation
= getenv (EMULATION_ENVIRON
);
533 if (emulation
== NULL
)
534 emulation
= DEFAULT_EMULATION
;
536 for (i
= 1; i
< argc
; i
++)
538 if (!strncmp (argv
[i
], "-m", 2))
540 if (argv
[i
][2] == '\0')
545 emulation
= argv
[i
+ 1];
550 einfo (_("%P%F: missing argument to -m\n"));
553 else if (strcmp (argv
[i
], "-mips1") == 0
554 || strcmp (argv
[i
], "-mips2") == 0
555 || strcmp (argv
[i
], "-mips3") == 0
556 || strcmp (argv
[i
], "-mips32") == 0
557 || strcmp (argv
[i
], "-mips64") == 0
558 || strcmp (argv
[i
], "-mips4") == 0
559 || strcmp (argv
[i
], "-mips5") == 0)
561 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
562 passed to the linker by some MIPS compilers. They
563 generally tell the linker to use a slightly different
564 library path. Perhaps someday these should be
565 implemented as emulations; until then, we just ignore
566 the arguments and hope that nobody ever creates
567 emulations named ips1, ips2 or ips3. */
569 else if (strcmp (argv
[i
], "-m486") == 0)
571 /* FIXME: The argument -m486 is passed to the linker on
572 some Linux systems. Hope that nobody creates an
573 emulation named 486. */
578 emulation
= &argv
[i
][2];
586 /* If directory DIR contains an "ldscripts" subdirectory,
587 add DIR to the library search path and return true,
588 else return false. */
591 check_for_scripts_dir (dir
)
599 dirlen
= strlen (dir
);
600 /* sizeof counts the terminating NUL. */
601 buf
= (char *) xmalloc (dirlen
+ sizeof ("/ldscripts"));
602 sprintf (buf
, "%s/ldscripts", dir
);
604 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
607 ldfile_add_library_path (dir
, false);
611 /* Set the default directory for finding script files.
612 Libraries will be searched for here too, but that's ok.
613 We look for the "ldscripts" directory in:
615 SCRIPTDIR (passed from Makefile)
616 the dir where this program is (for using it from the build tree)
617 the dir where this program is/../lib (for installing the tool suite elsewhere) */
625 if (check_for_scripts_dir (SCRIPTDIR
))
626 /* We've been installed normally. */
629 /* Look for "ldscripts" in the dir where our binary is. */
630 end
= strrchr (program_name
, '/');
631 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
633 /* We could have \foo\bar, or /foo\bar. */
634 char *bslash
= strrchr (program_name
, '\\');
635 if (end
== NULL
|| (bslash
!= NULL
&& bslash
> end
))
642 /* Don't look for ldscripts in the current directory. There is
643 too much potential for confusion. */
647 dirlen
= end
- program_name
;
648 /* Make a copy of program_name in dir.
649 Leave room for later "/../lib". */
650 dir
= (char *) xmalloc (dirlen
+ 8);
651 strncpy (dir
, program_name
, dirlen
);
654 if (check_for_scripts_dir (dir
))
655 /* Don't free dir. */
658 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
659 strcpy (dir
+ dirlen
, "/../lib");
660 if (check_for_scripts_dir (dir
))
663 /* Well, we tried. */
671 if (link_info
.notice_hash
== (struct bfd_hash_table
*) NULL
)
673 link_info
.notice_hash
= ((struct bfd_hash_table
*)
674 xmalloc (sizeof (struct bfd_hash_table
)));
675 if (! bfd_hash_table_init_n (link_info
.notice_hash
,
678 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
681 if (bfd_hash_lookup (link_info
.notice_hash
, name
, true, true)
682 == (struct bfd_hash_entry
*) NULL
)
683 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
686 /* Record a symbol to be wrapped, from the --wrap option. */
692 if (link_info
.wrap_hash
== NULL
)
694 link_info
.wrap_hash
= ((struct bfd_hash_table
*)
695 xmalloc (sizeof (struct bfd_hash_table
)));
696 if (! bfd_hash_table_init_n (link_info
.wrap_hash
,
699 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
701 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, true, true) == NULL
)
702 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
705 /* Handle the -retain-symbols-file option. */
708 add_keepsyms_file (filename
)
709 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");
720 if (file
== (FILE *) NULL
)
722 bfd_set_error (bfd_error_system_call
);
723 einfo ("%X%P: %s: %E\n", filename
);
727 link_info
.keep_hash
= ((struct bfd_hash_table
*)
728 xmalloc (sizeof (struct bfd_hash_table
)));
729 if (! bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
))
730 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
733 buf
= (char *) 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)
760 == (struct bfd_hash_entry
*) NULL
)
761 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
765 if (link_info
.strip
!= strip_none
)
766 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 (info
, abfd
, name
)
778 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
782 lang_input_statement_type
*input
;
784 input
= ((lang_input_statement_type
*)
785 xmalloc (sizeof (lang_input_statement_type
)));
786 input
->filename
= abfd
->filename
;
787 input
->local_sym_name
= abfd
->filename
;
788 input
->the_bfd
= abfd
;
789 input
->asymbols
= NULL
;
791 input
->just_syms_flag
= false;
792 input
->loaded
= false;
793 input
->search_dirs_flag
= false;
795 /* FIXME: The following fields are not set: header.next,
796 header.type, closed, passive_position, symbol_count,
797 next_real_file, is_archive, target, real. This bit of code is
798 from the old decode_library_subfile function. I don't know
799 whether any of those fields matters. */
801 ldlang_add_file (input
);
803 if (config
.map_file
!= (FILE *) NULL
)
805 static boolean header_printed
;
806 struct bfd_link_hash_entry
*h
;
810 h
= bfd_link_hash_lookup (link_info
.hash
, name
, false, false, true);
822 case bfd_link_hash_defined
:
823 case bfd_link_hash_defweak
:
824 from
= h
->u
.def
.section
->owner
;
827 case bfd_link_hash_undefined
:
828 case bfd_link_hash_undefweak
:
829 from
= h
->u
.undef
.abfd
;
832 case bfd_link_hash_common
:
833 from
= h
->u
.c
.p
->section
->owner
;
838 if (! header_printed
)
842 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
844 header_printed
= true;
847 if (bfd_my_archive (abfd
) == NULL
)
849 minfo ("%s", bfd_get_filename (abfd
));
850 len
= strlen (bfd_get_filename (abfd
));
854 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
855 bfd_get_filename (abfd
));
856 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
857 + strlen (bfd_get_filename (abfd
))
875 minfo ("(%T)\n", h
->root
.string
);
877 minfo ("(%s)\n", name
);
880 if (trace_files
|| trace_file_tries
)
881 info_msg ("%I\n", input
);
886 /* This is called when BFD has discovered a symbol which is defined
890 multiple_definition (info
, name
, obfd
, osec
, oval
, nbfd
, nsec
, nval
)
891 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
900 /* If either section has the output_section field set to
901 bfd_abs_section_ptr, it means that the section is being
902 discarded, and this is not really a multiple definition at all.
903 FIXME: It would be cleaner to somehow ignore symbols defined in
904 sections which are being discarded. */
905 if ((osec
->output_section
!= NULL
906 && ! bfd_is_abs_section (osec
)
907 && bfd_is_abs_section (osec
->output_section
))
908 || (nsec
->output_section
!= NULL
909 && ! bfd_is_abs_section (nsec
)
910 && bfd_is_abs_section (nsec
->output_section
)))
913 einfo (_("%X%C: multiple definition of `%T'\n"),
914 nbfd
, nsec
, nval
, name
);
915 if (obfd
!= (bfd
*) NULL
)
916 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
918 if (command_line
.relax
)
920 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
921 command_line
.relax
= 0;
927 /* This is called when there is a definition of a common symbol, or
928 when a common symbol is found for a symbol that is already defined,
929 or when two common symbols are found. We only do something if
930 -warn-common was used. */
933 multiple_common (info
, name
, obfd
, otype
, osize
, nbfd
, ntype
, nsize
)
934 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
937 enum bfd_link_hash_type otype
;
940 enum bfd_link_hash_type ntype
;
943 if (! config
.warn_common
)
946 if (ntype
== bfd_link_hash_defined
947 || ntype
== bfd_link_hash_defweak
948 || ntype
== bfd_link_hash_indirect
)
950 ASSERT (otype
== bfd_link_hash_common
);
951 einfo (_("%B: warning: definition of `%T' overriding common\n"),
954 einfo (_("%B: warning: common is here\n"), obfd
);
956 else if (otype
== bfd_link_hash_defined
957 || otype
== bfd_link_hash_defweak
958 || otype
== bfd_link_hash_indirect
)
960 ASSERT (ntype
== bfd_link_hash_common
);
961 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
964 einfo (_("%B: warning: defined here\n"), obfd
);
968 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
971 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
974 einfo (_("%B: warning: larger common is here\n"), obfd
);
976 else if (nsize
> osize
)
978 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
981 einfo (_("%B: warning: smaller common is here\n"), obfd
);
985 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
987 einfo (_("%B: warning: previous common is here\n"), obfd
);
994 /* This is called when BFD has discovered a set element. H is the
995 entry in the linker hash table for the set. SECTION and VALUE
996 represent a value which should be added to the set. */
999 add_to_set (info
, h
, reloc
, abfd
, section
, value
)
1000 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1001 struct bfd_link_hash_entry
*h
;
1002 bfd_reloc_code_real_type reloc
;
1007 if (config
.warn_constructors
)
1008 einfo (_("%P: warning: global constructor %s used\n"),
1011 if (! config
.build_constructors
)
1014 ldctor_add_set_entry (h
, reloc
, (const char *) NULL
, section
, value
);
1016 if (h
->type
== bfd_link_hash_new
)
1018 h
->type
= bfd_link_hash_undefined
;
1019 h
->u
.undef
.abfd
= abfd
;
1020 /* We don't call bfd_link_add_undef to add this to the list of
1021 undefined symbols because we are going to define it
1028 /* This is called when BFD has discovered a constructor. This is only
1029 called for some object file formats--those which do not handle
1030 constructors in some more clever fashion. This is similar to
1031 adding an element to a set, but less general. */
1034 constructor_callback (info
, constructor
, name
, abfd
, section
, value
)
1035 struct bfd_link_info
*info
;
1036 boolean constructor
;
1043 struct bfd_link_hash_entry
*h
;
1044 char set_name
[1 + sizeof "__CTOR_LIST__"];
1046 if (config
.warn_constructors
)
1047 einfo (_("%P: warning: global constructor %s used\n"), name
);
1049 if (! config
.build_constructors
)
1052 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1053 useful error message. */
1054 if (bfd_reloc_type_lookup (output_bfd
, BFD_RELOC_CTOR
) == NULL
1055 && (link_info
.relocateable
1056 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1057 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1060 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1061 *s
++ = bfd_get_symbol_leading_char (abfd
);
1063 strcpy (s
, "__CTOR_LIST__");
1065 strcpy (s
, "__DTOR_LIST__");
1067 h
= bfd_link_hash_lookup (info
->hash
, set_name
, true, true, true);
1068 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1069 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1070 if (h
->type
== bfd_link_hash_new
)
1072 h
->type
= bfd_link_hash_undefined
;
1073 h
->u
.undef
.abfd
= abfd
;
1074 /* We don't call bfd_link_add_undef to add this to the list of
1075 undefined symbols because we are going to define it
1079 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1083 /* A structure used by warning_callback to pass information through
1084 bfd_map_over_sections. */
1086 struct warning_callback_info
{
1088 const char *warning
;
1093 /* This is called when there is a reference to a warning symbol. */
1096 warning_callback (info
, warning
, symbol
, abfd
, section
, address
)
1097 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1098 const char *warning
;
1104 /* This is a hack to support warn_multiple_gp. FIXME: This should
1105 have a cleaner interface, but what? */
1106 if (! config
.warn_multiple_gp
1107 && strcmp (warning
, "using multiple gp values") == 0)
1110 if (section
!= NULL
)
1111 einfo ("%C: %s\n", abfd
, section
, address
, warning
);
1112 else if (abfd
== NULL
)
1113 einfo ("%P: %s\n", warning
);
1114 else if (symbol
== NULL
)
1115 einfo ("%B: %s\n", abfd
, warning
);
1118 lang_input_statement_type
*entry
;
1120 struct warning_callback_info info
;
1122 /* Look through the relocs to see if we can find a plausible
1125 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1126 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1127 asymbols
= entry
->asymbols
;
1133 symsize
= bfd_get_symtab_upper_bound (abfd
);
1135 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1136 asymbols
= (asymbol
**) xmalloc (symsize
);
1137 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1138 if (symbol_count
< 0)
1139 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1142 entry
->asymbols
= asymbols
;
1143 entry
->symbol_count
= symbol_count
;
1148 info
.warning
= warning
;
1149 info
.symbol
= symbol
;
1150 info
.asymbols
= asymbols
;
1151 bfd_map_over_sections (abfd
, warning_find_reloc
, (PTR
) &info
);
1154 einfo ("%B: %s\n", abfd
, warning
);
1163 /* This is called by warning_callback for each section. It checks the
1164 relocs of the section to see if it can find a reference to the
1165 symbol which triggered the warning. If it can, it uses the reloc
1166 to give an error message with a file and line number. */
1169 warning_find_reloc (abfd
, sec
, iarg
)
1174 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1178 arelent
**p
, **pend
;
1183 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1185 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1189 relpp
= (arelent
**) xmalloc (relsize
);
1190 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1192 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1195 pend
= p
+ relcount
;
1196 for (; p
< pend
&& *p
!= NULL
; p
++)
1200 if (q
->sym_ptr_ptr
!= NULL
1201 && *q
->sym_ptr_ptr
!= NULL
1202 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1204 /* We found a reloc for the symbol we are looking for. */
1205 einfo ("%C: %s\n", abfd
, sec
, q
->address
, info
->warning
);
1214 /* This is called when an undefined symbol is found. */
1217 undefined_symbol (info
, name
, abfd
, section
, address
, fatal
)
1218 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1223 boolean fatal ATTRIBUTE_UNUSED
;
1225 static char *error_name
;
1226 static unsigned int error_count
;
1228 #define MAX_ERRORS_IN_A_ROW 5
1230 if (config
.warn_once
)
1232 static struct bfd_hash_table
*hash
;
1234 /* Only warn once about a particular undefined symbol. */
1238 hash
= ((struct bfd_hash_table
*)
1239 xmalloc (sizeof (struct bfd_hash_table
)));
1240 if (! bfd_hash_table_init (hash
, bfd_hash_newfunc
))
1241 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1244 if (bfd_hash_lookup (hash
, name
, false, false) != NULL
)
1247 if (bfd_hash_lookup (hash
, name
, true, true) == NULL
)
1248 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1251 /* We never print more than a reasonable number of errors in a row
1252 for a single symbol. */
1253 if (error_name
!= (char *) NULL
1254 && strcmp (name
, error_name
) == 0)
1259 if (error_name
!= (char *) NULL
)
1261 error_name
= xstrdup (name
);
1264 if (section
!= NULL
)
1266 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1268 einfo (_("%C: undefined reference to `%T'\n"),
1269 abfd
, section
, address
, name
);
1273 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1274 einfo (_("%D: more undefined references to `%T' follow\n"),
1275 abfd
, section
, address
, name
);
1279 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1281 einfo (_("%B: undefined reference to `%T'\n"),
1286 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1287 einfo (_("%B: more undefined references to `%T' follow\n"),
1294 /* This is called when a reloc overflows. */
1297 reloc_overflow (info
, name
, reloc_name
, addend
, abfd
, section
, address
)
1298 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1300 const char *reloc_name
;
1306 if (abfd
== (bfd
*) NULL
)
1307 einfo (_("%P%X: generated"));
1309 einfo ("%X%C:", abfd
, section
, address
);
1310 einfo (_(" relocation truncated to fit: %s %T"), reloc_name
, name
);
1312 einfo ("+%v", addend
);
1317 /* This is called when a dangerous relocation is made. */
1320 reloc_dangerous (info
, message
, abfd
, section
, address
)
1321 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1322 const char *message
;
1327 if (abfd
== (bfd
*) NULL
)
1328 einfo (_("%P%X: generated"));
1330 einfo ("%X%C:", abfd
, section
, address
);
1331 einfo (_("dangerous relocation: %s\n"), message
);
1335 /* This is called when a reloc is being generated attached to a symbol
1336 that is not being output. */
1339 unattached_reloc (info
, name
, abfd
, section
, address
)
1340 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1346 if (abfd
== (bfd
*) NULL
)
1347 einfo (_("%P%X: generated"));
1349 einfo ("%X%C:", abfd
, section
, address
);
1350 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name
);
1354 /* This is called if link_info.notice_all is set, or when a symbol in
1355 link_info.notice_hash is found. Symbols are put in notice_hash
1356 using the -y option. */
1359 notice (info
, name
, abfd
, section
, value
)
1360 struct bfd_link_info
*info
;
1366 if (! info
->notice_all
1367 || (info
->notice_hash
!= NULL
1368 && bfd_hash_lookup (info
->notice_hash
, name
, false, false) != NULL
))
1370 if (bfd_is_und_section (section
))
1371 einfo ("%B: reference to %s\n", abfd
, name
);
1373 einfo ("%B: definition of %s\n", abfd
, name
);
1376 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1377 add_cref (name
, abfd
, section
, value
);