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. */
78 bfd_boolean trace_files
;
80 /* Nonzero means same, but note open failures, too. */
81 bfd_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 bfd_boolean version_printed
;
87 /* Nonzero means link in every member of an archive. */
88 bfd_boolean whole_archive
;
90 /* TRUE if we should demangle symbol names. */
91 bfd_boolean demangling
;
93 args_type command_line
;
95 ld_config_type config
;
97 static void remove_output
PARAMS ((void));
98 static bfd_boolean check_for_scripts_dir
PARAMS ((char *dir
));
99 static bfd_boolean add_archive_element
PARAMS ((struct bfd_link_info
*, bfd
*,
101 static bfd_boolean multiple_definition
PARAMS ((struct bfd_link_info
*,
103 bfd
*, asection
*, bfd_vma
,
104 bfd
*, asection
*, bfd_vma
));
105 static bfd_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 bfd_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 bfd_boolean constructor_callback
PARAMS ((struct bfd_link_info
*,
115 bfd_boolean constructor
,
117 bfd
*, asection
*, bfd_vma
));
118 static bfd_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 bfd_boolean undefined_symbol
PARAMS ((struct bfd_link_info
*,
124 asection
*, bfd_vma
, bfd_boolean
));
125 static bfd_boolean reloc_overflow
PARAMS ((struct bfd_link_info
*, const char *,
126 const char *, bfd_vma
,
127 bfd
*, asection
*, bfd_vma
));
128 static bfd_boolean reloc_dangerous
PARAMS ((struct bfd_link_info
*, const char *,
129 bfd
*, asection
*, bfd_vma
));
130 static bfd_boolean unattached_reloc
PARAMS ((struct bfd_link_info
*,
131 const char *, bfd
*, asection
*,
133 static bfd_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
.relocateable
= FALSE
;
232 link_info
.emitrelocations
= FALSE
;
233 link_info
.task_link
= 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
.allow_undefined_version
= TRUE
;
244 link_info
.keep_memory
= TRUE
;
245 link_info
.notice_all
= FALSE
;
246 link_info
.nocopyreloc
= FALSE
;
247 link_info
.new_dtags
= FALSE
;
248 link_info
.combreloc
= TRUE
;
249 link_info
.eh_frame_hdr
= FALSE
;
250 link_info
.strip
= strip_none
;
251 link_info
.discard
= discard_sec_merge
;
252 link_info
.common_skip_ar_aymbols
= bfd_link_common_skip_none
;
253 link_info
.callbacks
= &link_callbacks
;
254 link_info
.hash
= NULL
;
255 link_info
.keep_hash
= NULL
;
256 link_info
.notice_hash
= NULL
;
257 link_info
.wrap_hash
= NULL
;
258 link_info
.input_bfds
= NULL
;
259 link_info
.create_object_symbols_section
= NULL
;
260 link_info
.gc_sym_list
= NULL
;
261 link_info
.base_file
= NULL
;
262 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
263 and _fini symbols. We are compatible. */
264 link_info
.init_function
= "_init";
265 link_info
.fini_function
= "_fini";
266 link_info
.mpc860c0
= 0;
267 link_info
.pei386_auto_import
= -1;
268 link_info
.pei386_runtime_pseudo_reloc
= FALSE
;
269 link_info
.spare_dynamic_tags
= 5;
270 link_info
.flags
= (bfd_vma
) 0;
271 link_info
.flags_1
= (bfd_vma
) 0;
273 ldfile_add_arch ("");
275 config
.make_executable
= TRUE
;
276 force_make_executable
= FALSE
;
277 config
.magic_demand_paged
= TRUE
;
278 config
.text_read_only
= TRUE
;
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 ldemul_set_symbols ();
290 if (link_info
.relocateable
)
292 if (command_line
.gc_sections
)
293 einfo ("%P%F: --gc-sections and -r may not be used together\n");
294 if (link_info
.mpc860c0
)
295 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
296 else if (command_line
.relax
)
297 einfo (_("%P%F: --relax and -r may not be used together\n"));
298 if (link_info
.shared
)
299 einfo (_("%P%F: -r and -shared may not be used together\n"));
302 if (! link_info
.shared
)
304 if (command_line
.filter_shlib
)
305 einfo (_("%P%F: -F may not be used without -shared\n"));
306 if (command_line
.auxiliary_filters
)
307 einfo (_("%P%F: -f may not be used without -shared\n"));
310 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
311 don't see how else this can be handled, since in this case we
312 must preserve all externally visible symbols. */
313 if (link_info
.relocateable
&& link_info
.strip
== strip_all
)
315 link_info
.strip
= strip_debugger
;
316 if (link_info
.discard
== discard_sec_merge
)
317 link_info
.discard
= discard_all
;
320 /* This essentially adds another -L directory so this must be done after
321 the -L's in argv have been processed. */
324 /* If we have not already opened and parsed a linker script
325 read the emulation's appropriate default script. */
326 if (saved_script_handle
== NULL
)
329 char *s
= ldemul_get_script (&isfile
);
332 ldfile_open_command_file (s
);
338 parser_input
= input_script
;
343 if (trace_file_tries
)
345 if (saved_script_handle
)
346 info_msg (_("using external linker script:"));
348 info_msg (_("using internal linker script:"));
349 info_msg ("\n==================================================\n");
351 if (saved_script_handle
)
353 static const int ld_bufsz
= 8193;
355 char *buf
= xmalloc (ld_bufsz
);
357 rewind (saved_script_handle
);
358 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
363 rewind (saved_script_handle
);
370 info_msg (ldemul_get_script (&isfile
));
373 info_msg ("\n==================================================\n");
378 if (!lang_has_input_file
)
382 einfo (_("%P%F: no input files\n"));
387 info_msg (_("%P: mode %s\n"), emulation
);
390 ldemul_after_parse ();
392 if (config
.map_filename
)
394 if (strcmp (config
.map_filename
, "-") == 0)
396 config
.map_file
= stdout
;
400 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
401 if (config
.map_file
== (FILE *) NULL
)
403 bfd_set_error (bfd_error_system_call
);
404 einfo (_("%P%F: cannot open map file %s: %E\n"),
405 config
.map_filename
);
412 /* Print error messages for any missing symbols, for any warning
413 symbols, and possibly multiple definitions. */
415 if (link_info
.relocateable
)
416 output_bfd
->flags
&= ~EXEC_P
;
418 output_bfd
->flags
|= EXEC_P
;
422 if (config
.map_file
!= NULL
)
424 if (command_line
.cref
)
425 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
426 if (nocrossref_list
!= NULL
)
427 check_nocrossrefs ();
429 /* Even if we're producing relocateable output, some non-fatal errors should
430 be reported in the exit status. (What non-fatal errors, if any, do we
431 want to ignore for relocateable output?) */
433 if (!config
.make_executable
&& !force_make_executable
)
437 einfo (_("%P: link errors found, deleting executable `%s'\n"),
441 /* The file will be removed by remove_output. */
447 if (! bfd_close (output_bfd
))
448 einfo (_("%F%B: final close failed: %E\n"), output_bfd
);
450 /* If the --force-exe-suffix is enabled, and we're making an
451 executable file and it doesn't end in .exe, copy it to one
453 if (! link_info
.relocateable
&& command_line
.force_exe_suffix
)
455 int len
= strlen (output_filename
);
457 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
458 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
462 const int bsize
= 4096;
463 char *buf
= xmalloc (bsize
);
465 char *dst_name
= xmalloc (len
+ 5);
466 strcpy (dst_name
, output_filename
);
467 strcat (dst_name
, ".exe");
468 src
= fopen (output_filename
, FOPEN_RB
);
469 dst
= fopen (dst_name
, FOPEN_WB
);
472 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename
);
474 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name
);
475 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
477 int done
= fwrite (buf
, 1, l
, dst
);
480 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
484 if (fclose (dst
) == EOF
)
486 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
494 END_PROGRESS (program_name
);
499 char *lim
= (char *) sbrk (0);
501 long run_time
= get_run_time () - start_time
;
503 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
504 program_name
, run_time
/ 1000000, run_time
% 1000000);
506 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
507 (long) (lim
- (char *) &environ
));
511 /* Prevent remove_output from doing anything, after a successful link. */
512 output_filename
= NULL
;
518 /* We need to find any explicitly given emulation in order to initialize the
519 state that's needed by the lex&yacc argument parser (parse_args). */
522 get_emulation (argc
, argv
)
529 emulation
= getenv (EMULATION_ENVIRON
);
530 if (emulation
== NULL
)
531 emulation
= DEFAULT_EMULATION
;
533 for (i
= 1; i
< argc
; i
++)
535 if (!strncmp (argv
[i
], "-m", 2))
537 if (argv
[i
][2] == '\0')
542 emulation
= argv
[i
+ 1];
547 einfo (_("%P%F: missing argument to -m\n"));
550 else if (strcmp (argv
[i
], "-mips1") == 0
551 || strcmp (argv
[i
], "-mips2") == 0
552 || strcmp (argv
[i
], "-mips3") == 0
553 || strcmp (argv
[i
], "-mips32") == 0
554 || strcmp (argv
[i
], "-mips64") == 0
555 || strcmp (argv
[i
], "-mips4") == 0
556 || strcmp (argv
[i
], "-mips5") == 0)
558 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
559 passed to the linker by some MIPS compilers. They
560 generally tell the linker to use a slightly different
561 library path. Perhaps someday these should be
562 implemented as emulations; until then, we just ignore
563 the arguments and hope that nobody ever creates
564 emulations named ips1, ips2 or ips3. */
566 else if (strcmp (argv
[i
], "-m486") == 0)
568 /* FIXME: The argument -m486 is passed to the linker on
569 some Linux systems. Hope that nobody creates an
570 emulation named 486. */
575 emulation
= &argv
[i
][2];
583 /* If directory DIR contains an "ldscripts" subdirectory,
584 add DIR to the library search path and return TRUE,
585 else return FALSE. */
588 check_for_scripts_dir (dir
)
596 dirlen
= strlen (dir
);
597 /* sizeof counts the terminating NUL. */
598 buf
= (char *) xmalloc (dirlen
+ sizeof ("/ldscripts"));
599 sprintf (buf
, "%s/ldscripts", dir
);
601 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
604 ldfile_add_library_path (dir
, FALSE
);
608 /* Set the default directory for finding script files.
609 Libraries will be searched for here too, but that's ok.
610 We look for the "ldscripts" directory in:
612 SCRIPTDIR (passed from Makefile)
613 the dir where this program is (for using it from the build tree)
614 the dir where this program is/../lib (for installing the tool suite elsewhere) */
622 if (check_for_scripts_dir (SCRIPTDIR
))
623 /* We've been installed normally. */
626 /* Look for "ldscripts" in the dir where our binary is. */
627 end
= strrchr (program_name
, '/');
628 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
630 /* We could have \foo\bar, or /foo\bar. */
631 char *bslash
= strrchr (program_name
, '\\');
632 if (end
== NULL
|| (bslash
!= NULL
&& bslash
> end
))
639 /* Don't look for ldscripts in the current directory. There is
640 too much potential for confusion. */
644 dirlen
= end
- program_name
;
645 /* Make a copy of program_name in dir.
646 Leave room for later "/../lib". */
647 dir
= (char *) xmalloc (dirlen
+ 8);
648 strncpy (dir
, program_name
, dirlen
);
651 if (check_for_scripts_dir (dir
))
652 /* Don't free dir. */
655 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
656 strcpy (dir
+ dirlen
, "/../lib");
657 if (check_for_scripts_dir (dir
))
660 /* Well, we tried. */
668 if (link_info
.notice_hash
== (struct bfd_hash_table
*) NULL
)
670 link_info
.notice_hash
= ((struct bfd_hash_table
*)
671 xmalloc (sizeof (struct bfd_hash_table
)));
672 if (! bfd_hash_table_init_n (link_info
.notice_hash
,
675 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
678 if (bfd_hash_lookup (link_info
.notice_hash
, name
, TRUE
, TRUE
)
679 == (struct bfd_hash_entry
*) NULL
)
680 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
683 /* Record a symbol to be wrapped, from the --wrap option. */
689 if (link_info
.wrap_hash
== NULL
)
691 link_info
.wrap_hash
= ((struct bfd_hash_table
*)
692 xmalloc (sizeof (struct bfd_hash_table
)));
693 if (! bfd_hash_table_init_n (link_info
.wrap_hash
,
696 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
698 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, TRUE
, TRUE
) == NULL
)
699 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
702 /* Handle the -retain-symbols-file option. */
705 add_keepsyms_file (filename
)
706 const char *filename
;
713 if (link_info
.strip
== strip_some
)
714 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
716 file
= fopen (filename
, "r");
717 if (file
== (FILE *) NULL
)
719 bfd_set_error (bfd_error_system_call
);
720 einfo ("%X%P: %s: %E\n", filename
);
724 link_info
.keep_hash
= ((struct bfd_hash_table
*)
725 xmalloc (sizeof (struct bfd_hash_table
)));
726 if (! bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
))
727 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
730 buf
= (char *) xmalloc (bufsize
);
742 while (! ISSPACE (c
) && c
!= EOF
)
749 buf
= xrealloc (buf
, bufsize
);
756 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, TRUE
, TRUE
)
757 == (struct bfd_hash_entry
*) 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"));
765 link_info
.strip
= strip_some
;
768 /* Callbacks from the BFD linker routines. */
770 /* This is called when BFD has decided to include an archive member in
774 add_archive_element (info
, abfd
, name
)
775 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
779 lang_input_statement_type
*input
;
781 input
= ((lang_input_statement_type
*)
782 xmalloc (sizeof (lang_input_statement_type
)));
783 input
->filename
= abfd
->filename
;
784 input
->local_sym_name
= abfd
->filename
;
785 input
->the_bfd
= abfd
;
786 input
->asymbols
= NULL
;
788 input
->just_syms_flag
= FALSE
;
789 input
->loaded
= FALSE
;
790 input
->search_dirs_flag
= FALSE
;
792 /* FIXME: The following fields are not set: header.next,
793 header.type, closed, passive_position, symbol_count,
794 next_real_file, is_archive, target, real. This bit of code is
795 from the old decode_library_subfile function. I don't know
796 whether any of those fields matters. */
798 ldlang_add_file (input
);
800 if (config
.map_file
!= (FILE *) NULL
)
802 static bfd_boolean header_printed
;
803 struct bfd_link_hash_entry
*h
;
807 h
= bfd_link_hash_lookup (link_info
.hash
, name
, FALSE
, FALSE
, TRUE
);
819 case bfd_link_hash_defined
:
820 case bfd_link_hash_defweak
:
821 from
= h
->u
.def
.section
->owner
;
824 case bfd_link_hash_undefined
:
825 case bfd_link_hash_undefweak
:
826 from
= h
->u
.undef
.abfd
;
829 case bfd_link_hash_common
:
830 from
= h
->u
.c
.p
->section
->owner
;
835 if (! header_printed
)
839 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
841 header_printed
= TRUE
;
844 if (bfd_my_archive (abfd
) == NULL
)
846 minfo ("%s", bfd_get_filename (abfd
));
847 len
= strlen (bfd_get_filename (abfd
));
851 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
852 bfd_get_filename (abfd
));
853 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
854 + strlen (bfd_get_filename (abfd
))
872 minfo ("(%T)\n", h
->root
.string
);
874 minfo ("(%s)\n", name
);
877 if (trace_files
|| trace_file_tries
)
878 info_msg ("%I\n", input
);
883 /* This is called when BFD has discovered a symbol which is defined
887 multiple_definition (info
, name
, obfd
, osec
, oval
, nbfd
, nsec
, nval
)
888 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
897 /* If either section has the output_section field set to
898 bfd_abs_section_ptr, it means that the section is being
899 discarded, and this is not really a multiple definition at all.
900 FIXME: It would be cleaner to somehow ignore symbols defined in
901 sections which are being discarded. */
902 if ((osec
->output_section
!= NULL
903 && ! bfd_is_abs_section (osec
)
904 && bfd_is_abs_section (osec
->output_section
))
905 || (nsec
->output_section
!= NULL
906 && ! bfd_is_abs_section (nsec
)
907 && bfd_is_abs_section (nsec
->output_section
)))
910 einfo (_("%X%C: multiple definition of `%T'\n"),
911 nbfd
, nsec
, nval
, name
);
912 if (obfd
!= (bfd
*) NULL
)
913 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
915 if (command_line
.relax
)
917 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
918 command_line
.relax
= 0;
924 /* This is called when there is a definition of a common symbol, or
925 when a common symbol is found for a symbol that is already defined,
926 or when two common symbols are found. We only do something if
927 -warn-common was used. */
930 multiple_common (info
, name
, obfd
, otype
, osize
, nbfd
, ntype
, nsize
)
931 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
934 enum bfd_link_hash_type otype
;
937 enum bfd_link_hash_type ntype
;
940 if (! config
.warn_common
)
943 if (ntype
== bfd_link_hash_defined
944 || ntype
== bfd_link_hash_defweak
945 || ntype
== bfd_link_hash_indirect
)
947 ASSERT (otype
== bfd_link_hash_common
);
948 einfo (_("%B: warning: definition of `%T' overriding common\n"),
951 einfo (_("%B: warning: common is here\n"), obfd
);
953 else if (otype
== bfd_link_hash_defined
954 || otype
== bfd_link_hash_defweak
955 || otype
== bfd_link_hash_indirect
)
957 ASSERT (ntype
== bfd_link_hash_common
);
958 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
961 einfo (_("%B: warning: defined here\n"), obfd
);
965 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
968 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
971 einfo (_("%B: warning: larger common is here\n"), obfd
);
973 else if (nsize
> osize
)
975 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
978 einfo (_("%B: warning: smaller common is here\n"), obfd
);
982 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
984 einfo (_("%B: warning: previous common is here\n"), obfd
);
991 /* This is called when BFD has discovered a set element. H is the
992 entry in the linker hash table for the set. SECTION and VALUE
993 represent a value which should be added to the set. */
996 add_to_set (info
, h
, reloc
, abfd
, section
, value
)
997 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
998 struct bfd_link_hash_entry
*h
;
999 bfd_reloc_code_real_type reloc
;
1004 if (config
.warn_constructors
)
1005 einfo (_("%P: warning: global constructor %s used\n"),
1008 if (! config
.build_constructors
)
1011 ldctor_add_set_entry (h
, reloc
, (const char *) NULL
, section
, value
);
1013 if (h
->type
== bfd_link_hash_new
)
1015 h
->type
= bfd_link_hash_undefined
;
1016 h
->u
.undef
.abfd
= abfd
;
1017 /* We don't call bfd_link_add_undef to add this to the list of
1018 undefined symbols because we are going to define it
1025 /* This is called when BFD has discovered a constructor. This is only
1026 called for some object file formats--those which do not handle
1027 constructors in some more clever fashion. This is similar to
1028 adding an element to a set, but less general. */
1031 constructor_callback (info
, constructor
, name
, abfd
, section
, value
)
1032 struct bfd_link_info
*info
;
1033 bfd_boolean constructor
;
1040 struct bfd_link_hash_entry
*h
;
1041 char set_name
[1 + sizeof "__CTOR_LIST__"];
1043 if (config
.warn_constructors
)
1044 einfo (_("%P: warning: global constructor %s used\n"), name
);
1046 if (! config
.build_constructors
)
1049 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1050 useful error message. */
1051 if (bfd_reloc_type_lookup (output_bfd
, BFD_RELOC_CTOR
) == NULL
1052 && (link_info
.relocateable
1053 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1054 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1057 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1058 *s
++ = bfd_get_symbol_leading_char (abfd
);
1060 strcpy (s
, "__CTOR_LIST__");
1062 strcpy (s
, "__DTOR_LIST__");
1064 h
= bfd_link_hash_lookup (info
->hash
, set_name
, TRUE
, TRUE
, TRUE
);
1065 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1066 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1067 if (h
->type
== bfd_link_hash_new
)
1069 h
->type
= bfd_link_hash_undefined
;
1070 h
->u
.undef
.abfd
= abfd
;
1071 /* We don't call bfd_link_add_undef to add this to the list of
1072 undefined symbols because we are going to define it
1076 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1080 /* A structure used by warning_callback to pass information through
1081 bfd_map_over_sections. */
1083 struct warning_callback_info
{
1085 const char *warning
;
1090 /* This is called when there is a reference to a warning symbol. */
1093 warning_callback (info
, warning
, symbol
, abfd
, section
, address
)
1094 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1095 const char *warning
;
1101 /* This is a hack to support warn_multiple_gp. FIXME: This should
1102 have a cleaner interface, but what? */
1103 if (! config
.warn_multiple_gp
1104 && strcmp (warning
, "using multiple gp values") == 0)
1107 if (section
!= NULL
)
1108 einfo ("%C: %s\n", abfd
, section
, address
, warning
);
1109 else if (abfd
== NULL
)
1110 einfo ("%P: %s\n", warning
);
1111 else if (symbol
== NULL
)
1112 einfo ("%B: %s\n", abfd
, warning
);
1115 lang_input_statement_type
*entry
;
1117 struct warning_callback_info info
;
1119 /* Look through the relocs to see if we can find a plausible
1122 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1123 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1124 asymbols
= entry
->asymbols
;
1130 symsize
= bfd_get_symtab_upper_bound (abfd
);
1132 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1133 asymbols
= (asymbol
**) xmalloc (symsize
);
1134 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1135 if (symbol_count
< 0)
1136 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1139 entry
->asymbols
= asymbols
;
1140 entry
->symbol_count
= symbol_count
;
1145 info
.warning
= warning
;
1146 info
.symbol
= symbol
;
1147 info
.asymbols
= asymbols
;
1148 bfd_map_over_sections (abfd
, warning_find_reloc
, (PTR
) &info
);
1151 einfo ("%B: %s\n", abfd
, warning
);
1160 /* This is called by warning_callback for each section. It checks the
1161 relocs of the section to see if it can find a reference to the
1162 symbol which triggered the warning. If it can, it uses the reloc
1163 to give an error message with a file and line number. */
1166 warning_find_reloc (abfd
, sec
, iarg
)
1171 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1175 arelent
**p
, **pend
;
1180 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1182 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1186 relpp
= (arelent
**) xmalloc (relsize
);
1187 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1189 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1192 pend
= p
+ relcount
;
1193 for (; p
< pend
&& *p
!= NULL
; p
++)
1197 if (q
->sym_ptr_ptr
!= NULL
1198 && *q
->sym_ptr_ptr
!= NULL
1199 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1201 /* We found a reloc for the symbol we are looking for. */
1202 einfo ("%C: %s\n", abfd
, sec
, q
->address
, info
->warning
);
1211 /* This is called when an undefined symbol is found. */
1214 undefined_symbol (info
, name
, abfd
, section
, address
, fatal
)
1215 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1220 bfd_boolean fatal ATTRIBUTE_UNUSED
;
1222 static char *error_name
;
1223 static unsigned int error_count
;
1225 #define MAX_ERRORS_IN_A_ROW 5
1227 if (config
.warn_once
)
1229 static struct bfd_hash_table
*hash
;
1231 /* Only warn once about a particular undefined symbol. */
1235 hash
= ((struct bfd_hash_table
*)
1236 xmalloc (sizeof (struct bfd_hash_table
)));
1237 if (! bfd_hash_table_init (hash
, bfd_hash_newfunc
))
1238 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1241 if (bfd_hash_lookup (hash
, name
, FALSE
, FALSE
) != NULL
)
1244 if (bfd_hash_lookup (hash
, name
, TRUE
, TRUE
) == NULL
)
1245 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1248 /* We never print more than a reasonable number of errors in a row
1249 for a single symbol. */
1250 if (error_name
!= (char *) NULL
1251 && strcmp (name
, error_name
) == 0)
1256 if (error_name
!= (char *) NULL
)
1258 error_name
= xstrdup (name
);
1261 if (section
!= NULL
)
1263 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1265 einfo (_("%C: undefined reference to `%T'\n"),
1266 abfd
, section
, address
, name
);
1270 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1271 einfo (_("%D: more undefined references to `%T' follow\n"),
1272 abfd
, section
, address
, name
);
1276 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1278 einfo (_("%B: undefined reference to `%T'\n"),
1283 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1284 einfo (_("%B: more undefined references to `%T' follow\n"),
1291 /* This is called when a reloc overflows. */
1294 reloc_overflow (info
, name
, reloc_name
, addend
, abfd
, section
, address
)
1295 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1297 const char *reloc_name
;
1303 if (abfd
== (bfd
*) NULL
)
1304 einfo (_("%P%X: generated"));
1306 einfo ("%X%C:", abfd
, section
, address
);
1307 einfo (_(" relocation truncated to fit: %s %T"), reloc_name
, name
);
1309 einfo ("+%v", addend
);
1314 /* This is called when a dangerous relocation is made. */
1317 reloc_dangerous (info
, message
, abfd
, section
, address
)
1318 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1319 const char *message
;
1324 if (abfd
== (bfd
*) NULL
)
1325 einfo (_("%P%X: generated"));
1327 einfo ("%X%C:", abfd
, section
, address
);
1328 einfo (_("dangerous relocation: %s\n"), message
);
1332 /* This is called when a reloc is being generated attached to a symbol
1333 that is not being output. */
1336 unattached_reloc (info
, name
, abfd
, section
, address
)
1337 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1343 if (abfd
== (bfd
*) NULL
)
1344 einfo (_("%P%X: generated"));
1346 einfo ("%X%C:", abfd
, section
, address
);
1347 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name
);
1351 /* This is called if link_info.notice_all is set, or when a symbol in
1352 link_info.notice_hash is found. Symbols are put in notice_hash
1353 using the -y option. */
1356 notice (info
, name
, abfd
, section
, value
)
1357 struct bfd_link_info
*info
;
1363 if (! info
->notice_all
1364 || (info
->notice_hash
!= NULL
1365 && bfd_hash_lookup (info
->notice_hash
, name
, FALSE
, FALSE
) != NULL
))
1367 if (bfd_is_und_section (section
))
1368 einfo ("%B: reference to %s\n", abfd
, name
);
1370 einfo ("%B: definition of %s\n", abfd
, name
);
1373 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1374 add_cref (name
, abfd
, section
, value
);