1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of GLD, the Gnu Linker.
9 GLD 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 2, or (at your option)
14 GLD 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 GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 #include "filenames.h"
45 /* Somewhere above, sys/stat.h got included . . . . */
46 #if !defined(S_ISDIR) && defined(S_IFDIR)
47 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
53 #ifdef NEED_DECLARATION_SBRK
58 int main
PARAMS ((int, char **));
60 static char *get_emulation
PARAMS ((int, char **));
61 static void set_scripts_dir
PARAMS ((void));
66 const char *output_filename
= "a.out";
68 /* Name this program was invoked by. */
71 /* The file that we're creating. */
74 /* Set by -G argument, for MIPS ECOFF target. */
75 int g_switch_value
= 8;
77 /* Nonzero means print names of input files as processed. */
80 /* Nonzero means same, but note open failures, too. */
81 boolean trace_file_tries
;
83 /* Nonzero means version number was printed, so exit successfully
84 instead of complaining if no input files are given. */
85 boolean version_printed
;
87 /* Nonzero means link in every member of an archive. */
88 boolean whole_archive
;
90 /* True if we should demangle symbol names. */
93 args_type command_line
;
95 ld_config_type config
;
97 static void remove_output
PARAMS ((void));
98 static boolean check_for_scripts_dir
PARAMS ((char *dir
));
99 static boolean add_archive_element
PARAMS ((struct bfd_link_info
*, bfd
*,
101 static boolean multiple_definition
PARAMS ((struct bfd_link_info
*,
103 bfd
*, asection
*, bfd_vma
,
104 bfd
*, asection
*, bfd_vma
));
105 static boolean multiple_common
PARAMS ((struct bfd_link_info
*,
107 enum bfd_link_hash_type
, bfd_vma
,
108 bfd
*, enum bfd_link_hash_type
,
110 static boolean add_to_set
PARAMS ((struct bfd_link_info
*,
111 struct bfd_link_hash_entry
*,
112 bfd_reloc_code_real_type
,
113 bfd
*, asection
*, bfd_vma
));
114 static boolean constructor_callback
PARAMS ((struct bfd_link_info
*,
117 bfd
*, asection
*, bfd_vma
));
118 static boolean warning_callback
PARAMS ((struct bfd_link_info
*,
119 const char *, const char *, bfd
*,
120 asection
*, bfd_vma
));
121 static void warning_find_reloc
PARAMS ((bfd
*, asection
*, PTR
));
122 static boolean undefined_symbol
PARAMS ((struct bfd_link_info
*,
124 asection
*, bfd_vma
, boolean
));
125 static boolean reloc_overflow
PARAMS ((struct bfd_link_info
*, const char *,
126 const char *, bfd_vma
,
127 bfd
*, asection
*, bfd_vma
));
128 static boolean reloc_dangerous
PARAMS ((struct bfd_link_info
*, const char *,
129 bfd
*, asection
*, bfd_vma
));
130 static boolean unattached_reloc
PARAMS ((struct bfd_link_info
*,
131 const char *, bfd
*, asection
*,
133 static boolean notice
PARAMS ((struct bfd_link_info
*, const char *,
134 bfd
*, asection
*, bfd_vma
));
136 static struct bfd_link_callbacks link_callbacks
= {
141 constructor_callback
,
150 struct bfd_link_info link_info
;
157 if (output_bfd
&& output_bfd
->iostream
)
158 fclose ((FILE *) (output_bfd
->iostream
));
159 if (delete_output_file_on_failure
)
160 unlink (output_filename
);
170 long start_time
= get_run_time ();
172 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
173 setlocale (LC_MESSAGES
, "");
175 #if defined (HAVE_SETLOCALE)
176 setlocale (LC_CTYPE
, "");
178 bindtextdomain (PACKAGE
, LOCALEDIR
);
179 textdomain (PACKAGE
);
181 program_name
= argv
[0];
182 xmalloc_set_program_name (program_name
);
184 START_PROGRESS (program_name
, 0);
188 bfd_set_error_program_name (program_name
);
190 xatexit (remove_output
);
192 /* Set the default BFD target based on the configured target. Doing
193 this permits the linker to be configured for a particular target,
194 and linked against a shared BFD library which was configured for
195 a different target. The macro TARGET is defined by Makefile. */
196 if (! bfd_set_default_target (TARGET
))
198 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
209 /* Initialize the data about options. */
210 trace_files
= trace_file_tries
= version_printed
= false;
211 whole_archive
= false;
212 config
.build_constructors
= true;
213 config
.dynamic_link
= false;
214 config
.has_shared
= false;
215 config
.split_by_reloc
= (unsigned) -1;
216 config
.split_by_file
= (bfd_size_type
) -1;
217 command_line
.force_common_definition
= false;
218 command_line
.inhibit_common_definition
= false;
219 command_line
.interpreter
= NULL
;
220 command_line
.rpath
= NULL
;
221 command_line
.warn_mismatch
= true;
222 command_line
.check_section_addresses
= true;
224 /* We initialize DEMANGLING based on the environment variable
225 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
226 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
227 environment. Acting the same way here lets us provide the same
228 interface by default. */
229 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
231 link_info
.callbacks
= &link_callbacks
;
232 link_info
.relocateable
= false;
233 link_info
.emitrelocations
= false;
234 link_info
.shared
= false;
235 link_info
.symbolic
= false;
236 link_info
.export_dynamic
= false;
237 link_info
.static_link
= false;
238 link_info
.traditional_format
= false;
239 link_info
.optimize
= false;
240 link_info
.no_undefined
= false;
241 link_info
.allow_shlib_undefined
= false;
242 link_info
.allow_multiple_definition
= false;
243 link_info
.strip
= strip_none
;
244 link_info
.discard
= discard_sec_merge
;
245 link_info
.keep_memory
= true;
246 link_info
.input_bfds
= NULL
;
247 link_info
.create_object_symbols_section
= NULL
;
248 link_info
.gc_sym_list
= NULL
;
249 link_info
.hash
= NULL
;
250 link_info
.keep_hash
= NULL
;
251 link_info
.notice_all
= false;
252 link_info
.notice_hash
= NULL
;
253 link_info
.wrap_hash
= NULL
;
254 link_info
.mpc860c0
= 0;
255 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
256 and _fini symbols. We are compatible. */
257 link_info
.init_function
= "_init";
258 link_info
.fini_function
= "_fini";
259 link_info
.new_dtags
= false;
260 link_info
.eh_frame_hdr
= false;
261 link_info
.flags
= (bfd_vma
) 0;
262 link_info
.flags_1
= (bfd_vma
) 0;
263 link_info
.pei386_auto_import
= false;
264 link_info
.pei386_auto_import
= -1;
265 link_info
.combreloc
= true;
266 link_info
.spare_dynamic_tags
= 5;
267 link_info
.common_skip_ar_aymbols
= bfd_link_common_skip_none
;
269 ldfile_add_arch ("");
271 config
.make_executable
= true;
272 force_make_executable
= false;
273 config
.magic_demand_paged
= true;
274 config
.text_read_only
= true;
276 emulation
= get_emulation (argc
, argv
);
277 ldemul_choose_mode (emulation
);
278 default_target
= ldemul_choose_target (argc
, argv
);
280 ldemul_before_parse ();
281 lang_has_input_file
= false;
282 parse_args (argc
, argv
);
284 ldemul_set_symbols ();
286 if (link_info
.relocateable
)
288 if (command_line
.gc_sections
)
289 einfo ("%P%F: --gc-sections and -r may not be used together\n");
290 if (link_info
.mpc860c0
)
291 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
292 else if (command_line
.relax
)
293 einfo (_("%P%F: --relax and -r may not be used together\n"));
294 if (link_info
.shared
)
295 einfo (_("%P%F: -r and -shared may not be used together\n"));
298 if (! link_info
.shared
)
300 if (command_line
.filter_shlib
)
301 einfo (_("%P%F: -F may not be used without -shared\n"));
302 if (command_line
.auxiliary_filters
)
303 einfo (_("%P%F: -f may not be used without -shared\n"));
306 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
307 don't see how else this can be handled, since in this case we
308 must preserve all externally visible symbols. */
309 if (link_info
.relocateable
&& link_info
.strip
== strip_all
)
311 link_info
.strip
= strip_debugger
;
312 if (link_info
.discard
== discard_sec_merge
)
313 link_info
.discard
= discard_all
;
316 /* This essentially adds another -L directory so this must be done after
317 the -L's in argv have been processed. */
320 /* If we have not already opened and parsed a linker script
321 read the emulation's appropriate default script. */
322 if (saved_script_handle
== NULL
)
325 char *s
= ldemul_get_script (&isfile
);
328 ldfile_open_command_file (s
);
334 parser_input
= input_script
;
339 if (trace_file_tries
)
341 if (saved_script_handle
)
342 info_msg (_("using external linker script:"));
344 info_msg (_("using internal linker script:"));
345 info_msg ("\n==================================================\n");
347 if (saved_script_handle
)
349 static const int ld_bufsz
= 8193;
351 char *buf
= xmalloc (ld_bufsz
);
353 rewind (saved_script_handle
);
354 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
359 rewind (saved_script_handle
);
366 info_msg (ldemul_get_script (&isfile
));
369 info_msg ("\n==================================================\n");
374 if (lang_has_input_file
== false)
378 einfo (_("%P%F: no input files\n"));
383 info_msg (_("%P: mode %s\n"), emulation
);
386 ldemul_after_parse ();
388 if (config
.map_filename
)
390 if (strcmp (config
.map_filename
, "-") == 0)
392 config
.map_file
= stdout
;
396 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
397 if (config
.map_file
== (FILE *) NULL
)
399 bfd_set_error (bfd_error_system_call
);
400 einfo (_("%P%F: cannot open map file %s: %E\n"),
401 config
.map_filename
);
408 /* Print error messages for any missing symbols, for any warning
409 symbols, and possibly multiple definitions. */
411 if (link_info
.relocateable
)
412 output_bfd
->flags
&= ~EXEC_P
;
414 output_bfd
->flags
|= EXEC_P
;
418 if (config
.map_file
!= NULL
)
420 if (command_line
.cref
)
421 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
422 if (nocrossref_list
!= NULL
)
423 check_nocrossrefs ();
425 /* Even if we're producing relocateable output, some non-fatal errors should
426 be reported in the exit status. (What non-fatal errors, if any, do we
427 want to ignore for relocateable output?) */
429 if (config
.make_executable
== false && force_make_executable
== false)
431 if (trace_files
== true)
433 einfo (_("%P: link errors found, deleting executable `%s'\n"),
437 /* The file will be removed by remove_output. */
443 if (! bfd_close (output_bfd
))
444 einfo (_("%F%B: final close failed: %E\n"), output_bfd
);
446 /* If the --force-exe-suffix is enabled, and we're making an
447 executable file and it doesn't end in .exe, copy it to one
449 if (! link_info
.relocateable
&& command_line
.force_exe_suffix
)
451 int len
= strlen (output_filename
);
453 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
454 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
458 const int bsize
= 4096;
459 char *buf
= xmalloc (bsize
);
461 char *dst_name
= xmalloc (len
+ 5);
462 strcpy (dst_name
, output_filename
);
463 strcat (dst_name
, ".exe");
464 src
= fopen (output_filename
, FOPEN_RB
);
465 dst
= fopen (dst_name
, FOPEN_WB
);
468 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename
);
470 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name
);
471 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
473 int done
= fwrite (buf
, 1, l
, dst
);
476 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
480 if (fclose (dst
) == EOF
)
482 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
490 END_PROGRESS (program_name
);
495 char *lim
= (char *) sbrk (0);
497 long run_time
= get_run_time () - start_time
;
499 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
500 program_name
, run_time
/ 1000000, run_time
% 1000000);
502 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
503 (long) (lim
- (char *) &environ
));
507 /* Prevent remove_output from doing anything, after a successful link. */
508 output_filename
= NULL
;
514 /* We need to find any explicitly given emulation in order to initialize the
515 state that's needed by the lex&yacc argument parser (parse_args). */
518 get_emulation (argc
, argv
)
525 emulation
= getenv (EMULATION_ENVIRON
);
526 if (emulation
== NULL
)
527 emulation
= DEFAULT_EMULATION
;
529 for (i
= 1; i
< argc
; i
++)
531 if (!strncmp (argv
[i
], "-m", 2))
533 if (argv
[i
][2] == '\0')
538 emulation
= argv
[i
+ 1];
543 einfo (_("%P%F: missing argument to -m\n"));
546 else if (strcmp (argv
[i
], "-mips1") == 0
547 || strcmp (argv
[i
], "-mips2") == 0
548 || strcmp (argv
[i
], "-mips3") == 0
549 || strcmp (argv
[i
], "-mips32") == 0
550 || strcmp (argv
[i
], "-mips64") == 0
551 || strcmp (argv
[i
], "-mips4") == 0
552 || strcmp (argv
[i
], "-mips5") == 0)
554 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
555 passed to the linker by some MIPS compilers. They
556 generally tell the linker to use a slightly different
557 library path. Perhaps someday these should be
558 implemented as emulations; until then, we just ignore
559 the arguments and hope that nobody ever creates
560 emulations named ips1, ips2 or ips3. */
562 else if (strcmp (argv
[i
], "-m486") == 0)
564 /* FIXME: The argument -m486 is passed to the linker on
565 some Linux systems. Hope that nobody creates an
566 emulation named 486. */
571 emulation
= &argv
[i
][2];
579 /* If directory DIR contains an "ldscripts" subdirectory,
580 add DIR to the library search path and return true,
581 else return false. */
584 check_for_scripts_dir (dir
)
592 dirlen
= strlen (dir
);
593 /* sizeof counts the terminating NUL. */
594 buf
= (char *) xmalloc (dirlen
+ sizeof ("/ldscripts"));
595 sprintf (buf
, "%s/ldscripts", dir
);
597 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
600 ldfile_add_library_path (dir
, false);
604 /* Set the default directory for finding script files.
605 Libraries will be searched for here too, but that's ok.
606 We look for the "ldscripts" directory in:
608 SCRIPTDIR (passed from Makefile)
609 the dir where this program is (for using it from the build tree)
610 the dir where this program is/../lib (for installing the tool suite elsewhere) */
618 if (check_for_scripts_dir (SCRIPTDIR
))
619 /* We've been installed normally. */
622 /* Look for "ldscripts" in the dir where our binary is. */
623 end
= strrchr (program_name
, '/');
624 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
626 /* We could have \foo\bar, or /foo\bar. */
627 char *bslash
= strrchr (program_name
, '\\');
628 if (end
== NULL
|| (bslash
!= NULL
&& bslash
> end
))
635 /* Don't look for ldscripts in the current directory. There is
636 too much potential for confusion. */
640 dirlen
= end
- program_name
;
641 /* Make a copy of program_name in dir.
642 Leave room for later "/../lib". */
643 dir
= (char *) xmalloc (dirlen
+ 8);
644 strncpy (dir
, program_name
, dirlen
);
647 if (check_for_scripts_dir (dir
))
648 /* Don't free dir. */
651 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
652 strcpy (dir
+ dirlen
, "/../lib");
653 if (check_for_scripts_dir (dir
))
656 /* Well, we tried. */
664 if (link_info
.notice_hash
== (struct bfd_hash_table
*) NULL
)
666 link_info
.notice_hash
= ((struct bfd_hash_table
*)
667 xmalloc (sizeof (struct bfd_hash_table
)));
668 if (! bfd_hash_table_init_n (link_info
.notice_hash
,
671 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
674 if (bfd_hash_lookup (link_info
.notice_hash
, name
, true, true)
675 == (struct bfd_hash_entry
*) NULL
)
676 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
679 /* Record a symbol to be wrapped, from the --wrap option. */
685 if (link_info
.wrap_hash
== NULL
)
687 link_info
.wrap_hash
= ((struct bfd_hash_table
*)
688 xmalloc (sizeof (struct bfd_hash_table
)));
689 if (! bfd_hash_table_init_n (link_info
.wrap_hash
,
692 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
694 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, true, true) == NULL
)
695 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
698 /* Handle the -retain-symbols-file option. */
701 add_keepsyms_file (filename
)
702 const char *filename
;
709 if (link_info
.strip
== strip_some
)
710 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
712 file
= fopen (filename
, "r");
713 if (file
== (FILE *) NULL
)
715 bfd_set_error (bfd_error_system_call
);
716 einfo ("%X%P: %s: %E\n", filename
);
720 link_info
.keep_hash
= ((struct bfd_hash_table
*)
721 xmalloc (sizeof (struct bfd_hash_table
)));
722 if (! bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
))
723 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
726 buf
= (char *) xmalloc (bufsize
);
738 while (! ISSPACE (c
) && c
!= EOF
)
745 buf
= xrealloc (buf
, bufsize
);
752 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, true, true)
753 == (struct bfd_hash_entry
*) NULL
)
754 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
758 if (link_info
.strip
!= strip_none
)
759 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
761 link_info
.strip
= strip_some
;
764 /* Callbacks from the BFD linker routines. */
766 /* This is called when BFD has decided to include an archive member in
770 add_archive_element (info
, abfd
, name
)
771 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
775 lang_input_statement_type
*input
;
777 input
= ((lang_input_statement_type
*)
778 xmalloc (sizeof (lang_input_statement_type
)));
779 input
->filename
= abfd
->filename
;
780 input
->local_sym_name
= abfd
->filename
;
781 input
->the_bfd
= abfd
;
782 input
->asymbols
= NULL
;
784 input
->just_syms_flag
= false;
785 input
->loaded
= false;
786 input
->search_dirs_flag
= false;
788 /* FIXME: The following fields are not set: header.next,
789 header.type, closed, passive_position, symbol_count,
790 next_real_file, is_archive, target, real. This bit of code is
791 from the old decode_library_subfile function. I don't know
792 whether any of those fields matters. */
794 ldlang_add_file (input
);
796 if (config
.map_file
!= (FILE *) NULL
)
798 static boolean header_printed
;
799 struct bfd_link_hash_entry
*h
;
803 h
= bfd_link_hash_lookup (link_info
.hash
, name
, false, false, true);
815 case bfd_link_hash_defined
:
816 case bfd_link_hash_defweak
:
817 from
= h
->u
.def
.section
->owner
;
820 case bfd_link_hash_undefined
:
821 case bfd_link_hash_undefweak
:
822 from
= h
->u
.undef
.abfd
;
825 case bfd_link_hash_common
:
826 from
= h
->u
.c
.p
->section
->owner
;
831 if (! header_printed
)
835 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
837 header_printed
= true;
840 if (bfd_my_archive (abfd
) == NULL
)
842 minfo ("%s", bfd_get_filename (abfd
));
843 len
= strlen (bfd_get_filename (abfd
));
847 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
848 bfd_get_filename (abfd
));
849 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
850 + strlen (bfd_get_filename (abfd
))
868 minfo ("(%T)\n", h
->root
.string
);
870 minfo ("(%s)\n", name
);
873 if (trace_files
|| trace_file_tries
)
874 info_msg ("%I\n", input
);
879 /* This is called when BFD has discovered a symbol which is defined
883 multiple_definition (info
, name
, obfd
, osec
, oval
, nbfd
, nsec
, nval
)
884 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
893 /* If either section has the output_section field set to
894 bfd_abs_section_ptr, it means that the section is being
895 discarded, and this is not really a multiple definition at all.
896 FIXME: It would be cleaner to somehow ignore symbols defined in
897 sections which are being discarded. */
898 if ((osec
->output_section
!= NULL
899 && ! bfd_is_abs_section (osec
)
900 && bfd_is_abs_section (osec
->output_section
))
901 || (nsec
->output_section
!= NULL
902 && ! bfd_is_abs_section (nsec
)
903 && bfd_is_abs_section (nsec
->output_section
)))
906 einfo (_("%X%C: multiple definition of `%T'\n"),
907 nbfd
, nsec
, nval
, name
);
908 if (obfd
!= (bfd
*) NULL
)
909 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
911 if (command_line
.relax
)
913 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
914 command_line
.relax
= 0;
920 /* This is called when there is a definition of a common symbol, or
921 when a common symbol is found for a symbol that is already defined,
922 or when two common symbols are found. We only do something if
923 -warn-common was used. */
926 multiple_common (info
, name
, obfd
, otype
, osize
, nbfd
, ntype
, nsize
)
927 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
930 enum bfd_link_hash_type otype
;
933 enum bfd_link_hash_type ntype
;
936 if (! config
.warn_common
)
939 if (ntype
== bfd_link_hash_defined
940 || ntype
== bfd_link_hash_defweak
941 || ntype
== bfd_link_hash_indirect
)
943 ASSERT (otype
== bfd_link_hash_common
);
944 einfo (_("%B: warning: definition of `%T' overriding common\n"),
947 einfo (_("%B: warning: common is here\n"), obfd
);
949 else if (otype
== bfd_link_hash_defined
950 || otype
== bfd_link_hash_defweak
951 || otype
== bfd_link_hash_indirect
)
953 ASSERT (ntype
== bfd_link_hash_common
);
954 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
957 einfo (_("%B: warning: defined here\n"), obfd
);
961 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
964 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
967 einfo (_("%B: warning: larger common is here\n"), obfd
);
969 else if (nsize
> osize
)
971 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
974 einfo (_("%B: warning: smaller common is here\n"), obfd
);
978 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
980 einfo (_("%B: warning: previous common is here\n"), obfd
);
987 /* This is called when BFD has discovered a set element. H is the
988 entry in the linker hash table for the set. SECTION and VALUE
989 represent a value which should be added to the set. */
992 add_to_set (info
, h
, reloc
, abfd
, section
, value
)
993 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
, (const char *) 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 (info
, constructor
, name
, abfd
, section
, value
)
1028 struct bfd_link_info
*info
;
1029 boolean constructor
;
1036 struct bfd_link_hash_entry
*h
;
1037 char set_name
[1 + sizeof "__CTOR_LIST__"];
1039 if (config
.warn_constructors
)
1040 einfo (_("%P: warning: global constructor %s used\n"), name
);
1042 if (! config
.build_constructors
)
1045 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1046 useful error message. */
1047 if (bfd_reloc_type_lookup (output_bfd
, BFD_RELOC_CTOR
) == NULL
1048 && (link_info
.relocateable
1049 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1050 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1053 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1054 *s
++ = bfd_get_symbol_leading_char (abfd
);
1056 strcpy (s
, "__CTOR_LIST__");
1058 strcpy (s
, "__DTOR_LIST__");
1060 h
= bfd_link_hash_lookup (info
->hash
, set_name
, true, true, true);
1061 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1062 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1063 if (h
->type
== bfd_link_hash_new
)
1065 h
->type
= bfd_link_hash_undefined
;
1066 h
->u
.undef
.abfd
= abfd
;
1067 /* We don't call bfd_link_add_undef to add this to the list of
1068 undefined symbols because we are going to define it
1072 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1076 /* A structure used by warning_callback to pass information through
1077 bfd_map_over_sections. */
1079 struct warning_callback_info
{
1081 const char *warning
;
1086 /* This is called when there is a reference to a warning symbol. */
1089 warning_callback (info
, warning
, symbol
, abfd
, section
, address
)
1090 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1091 const char *warning
;
1097 /* This is a hack to support warn_multiple_gp. FIXME: This should
1098 have a cleaner interface, but what? */
1099 if (! config
.warn_multiple_gp
1100 && strcmp (warning
, "using multiple gp values") == 0)
1103 if (section
!= NULL
)
1104 einfo ("%C: %s\n", abfd
, section
, address
, warning
);
1105 else if (abfd
== NULL
)
1106 einfo ("%P: %s\n", warning
);
1107 else if (symbol
== NULL
)
1108 einfo ("%B: %s\n", abfd
, warning
);
1111 lang_input_statement_type
*entry
;
1113 struct warning_callback_info info
;
1115 /* Look through the relocs to see if we can find a plausible
1118 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1119 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1120 asymbols
= entry
->asymbols
;
1126 symsize
= bfd_get_symtab_upper_bound (abfd
);
1128 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1129 asymbols
= (asymbol
**) xmalloc (symsize
);
1130 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1131 if (symbol_count
< 0)
1132 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1135 entry
->asymbols
= asymbols
;
1136 entry
->symbol_count
= symbol_count
;
1141 info
.warning
= warning
;
1142 info
.symbol
= symbol
;
1143 info
.asymbols
= asymbols
;
1144 bfd_map_over_sections (abfd
, warning_find_reloc
, (PTR
) &info
);
1147 einfo ("%B: %s\n", abfd
, warning
);
1156 /* This is called by warning_callback for each section. It checks the
1157 relocs of the section to see if it can find a reference to the
1158 symbol which triggered the warning. If it can, it uses the reloc
1159 to give an error message with a file and line number. */
1162 warning_find_reloc (abfd
, sec
, iarg
)
1167 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1171 arelent
**p
, **pend
;
1176 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1178 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1182 relpp
= (arelent
**) xmalloc (relsize
);
1183 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1185 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1188 pend
= p
+ relcount
;
1189 for (; p
< pend
&& *p
!= NULL
; p
++)
1193 if (q
->sym_ptr_ptr
!= NULL
1194 && *q
->sym_ptr_ptr
!= NULL
1195 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1197 /* We found a reloc for the symbol we are looking for. */
1198 einfo ("%C: %s\n", abfd
, sec
, q
->address
, info
->warning
);
1207 /* This is called when an undefined symbol is found. */
1210 undefined_symbol (info
, name
, abfd
, section
, address
, fatal
)
1211 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1216 boolean fatal ATTRIBUTE_UNUSED
;
1218 static char *error_name
;
1219 static unsigned int error_count
;
1221 #define MAX_ERRORS_IN_A_ROW 5
1223 if (config
.warn_once
)
1225 static struct bfd_hash_table
*hash
;
1227 /* Only warn once about a particular undefined symbol. */
1231 hash
= ((struct bfd_hash_table
*)
1232 xmalloc (sizeof (struct bfd_hash_table
)));
1233 if (! bfd_hash_table_init (hash
, bfd_hash_newfunc
))
1234 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1237 if (bfd_hash_lookup (hash
, name
, false, false) != NULL
)
1240 if (bfd_hash_lookup (hash
, name
, true, true) == NULL
)
1241 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1244 /* We never print more than a reasonable number of errors in a row
1245 for a single symbol. */
1246 if (error_name
!= (char *) NULL
1247 && strcmp (name
, error_name
) == 0)
1252 if (error_name
!= (char *) NULL
)
1254 error_name
= xstrdup (name
);
1257 if (section
!= NULL
)
1259 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1261 einfo (_("%C: undefined reference to `%T'\n"),
1262 abfd
, section
, address
, name
);
1266 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1267 einfo (_("%D: more undefined references to `%T' follow\n"),
1268 abfd
, section
, address
, name
);
1272 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1274 einfo (_("%B: undefined reference to `%T'\n"),
1279 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1280 einfo (_("%B: more undefined references to `%T' follow\n"),
1287 /* This is called when a reloc overflows. */
1290 reloc_overflow (info
, name
, reloc_name
, addend
, abfd
, section
, address
)
1291 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1293 const char *reloc_name
;
1299 if (abfd
== (bfd
*) NULL
)
1300 einfo (_("%P%X: generated"));
1302 einfo ("%X%C:", abfd
, section
, address
);
1303 einfo (_(" relocation truncated to fit: %s %T"), reloc_name
, name
);
1305 einfo ("+%v", addend
);
1310 /* This is called when a dangerous relocation is made. */
1313 reloc_dangerous (info
, message
, abfd
, section
, address
)
1314 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1315 const char *message
;
1320 if (abfd
== (bfd
*) NULL
)
1321 einfo (_("%P%X: generated"));
1323 einfo ("%X%C:", abfd
, section
, address
);
1324 einfo (_("dangerous relocation: %s\n"), message
);
1328 /* This is called when a reloc is being generated attached to a symbol
1329 that is not being output. */
1332 unattached_reloc (info
, name
, abfd
, section
, address
)
1333 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1339 if (abfd
== (bfd
*) NULL
)
1340 einfo (_("%P%X: generated"));
1342 einfo ("%X%C:", abfd
, section
, address
);
1343 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name
);
1347 /* This is called if link_info.notice_all is set, or when a symbol in
1348 link_info.notice_hash is found. Symbols are put in notice_hash
1349 using the -y option. */
1352 notice (info
, name
, abfd
, section
, value
)
1353 struct bfd_link_info
*info
;
1359 if (! info
->notice_all
1360 || (info
->notice_hash
!= NULL
1361 && bfd_hash_lookup (info
->notice_hash
, name
, false, false) != NULL
))
1363 if (bfd_is_und_section (section
))
1364 einfo ("%B: reference to %s\n", abfd
, name
);
1366 einfo ("%B: definition of %s\n", abfd
, name
);
1369 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1370 add_cref (name
, abfd
, section
, value
);