1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
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
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 bindtextdomain (PACKAGE
, LOCALEDIR
);
173 textdomain (PACKAGE
);
175 program_name
= argv
[0];
176 xmalloc_set_program_name (program_name
);
178 START_PROGRESS (program_name
, 0);
182 bfd_set_error_program_name (program_name
);
184 xatexit (remove_output
);
186 /* Set the default BFD target based on the configured target. Doing
187 this permits the linker to be configured for a particular target,
188 and linked against a shared BFD library which was configured for
189 a different target. The macro TARGET is defined by Makefile. */
190 if (! bfd_set_default_target (TARGET
))
192 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
196 /* Initialize the data about options. */
197 trace_files
= trace_file_tries
= version_printed
= false;
198 whole_archive
= false;
199 config
.build_constructors
= true;
200 config
.dynamic_link
= false;
201 config
.has_shared
= false;
202 config
.split_by_reloc
= (unsigned) -1;
203 config
.split_by_file
= (bfd_size_type
) -1;
204 command_line
.force_common_definition
= false;
205 command_line
.interpreter
= NULL
;
206 command_line
.rpath
= NULL
;
207 command_line
.warn_mismatch
= true;
208 command_line
.check_section_addresses
= true;
210 /* We initialize DEMANGLING based on the environment variable
211 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
212 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
213 environment. Acting the same way here lets us provide the same
214 interface by default. */
215 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
217 link_info
.callbacks
= &link_callbacks
;
218 link_info
.relocateable
= false;
219 link_info
.emitrelocations
= false;
220 link_info
.shared
= false;
221 link_info
.symbolic
= false;
222 link_info
.export_dynamic
= false;
223 link_info
.static_link
= false;
224 link_info
.traditional_format
= false;
225 link_info
.optimize
= false;
226 link_info
.no_undefined
= false;
227 link_info
.allow_shlib_undefined
= false;
228 link_info
.strip
= strip_none
;
229 link_info
.discard
= discard_sec_merge
;
230 link_info
.keep_memory
= true;
231 link_info
.input_bfds
= NULL
;
232 link_info
.create_object_symbols_section
= NULL
;
233 link_info
.hash
= NULL
;
234 link_info
.keep_hash
= NULL
;
235 link_info
.notice_all
= false;
236 link_info
.notice_hash
= NULL
;
237 link_info
.wrap_hash
= NULL
;
238 link_info
.mpc860c0
= 0;
239 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
240 and _fini symbols. We are compatible. */
241 link_info
.init_function
= "_init";
242 link_info
.fini_function
= "_fini";
243 link_info
.new_dtags
= false;
244 link_info
.flags
= (bfd_vma
) 0;
245 link_info
.flags_1
= (bfd_vma
) 0;
246 link_info
.pei386_auto_import
= false;
248 ldfile_add_arch ("");
250 config
.make_executable
= true;
251 force_make_executable
= false;
252 config
.magic_demand_paged
= true;
253 config
.text_read_only
= true;
255 emulation
= get_emulation (argc
, argv
);
256 ldemul_choose_mode (emulation
);
257 default_target
= ldemul_choose_target ();
259 ldemul_before_parse ();
260 lang_has_input_file
= false;
261 parse_args (argc
, argv
);
263 ldemul_set_symbols ();
265 if (link_info
.relocateable
)
267 if (command_line
.gc_sections
)
268 einfo ("%P%F: --gc-sections and -r may not be used together\n");
269 if (link_info
.mpc860c0
)
270 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
271 else if (command_line
.relax
)
272 einfo (_("%P%F: --relax and -r may not be used together\n"));
273 if (link_info
.shared
)
274 einfo (_("%P%F: -r and -shared may not be used together\n"));
277 if (! link_info
.shared
)
279 if (command_line
.filter_shlib
)
280 einfo (_("%P%F: -F may not be used without -shared\n"));
281 if (command_line
.auxiliary_filters
)
282 einfo (_("%P%F: -f may not be used without -shared\n"));
285 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
286 don't see how else this can be handled, since in this case we
287 must preserve all externally visible symbols. */
288 if (link_info
.relocateable
&& link_info
.strip
== strip_all
)
290 link_info
.strip
= strip_debugger
;
291 if (link_info
.discard
== discard_sec_merge
)
292 link_info
.discard
= discard_all
;
295 /* This essentially adds another -L directory so this must be done after
296 the -L's in argv have been processed. */
299 /* If we have not already opened and parsed a linker script
300 read the emulation's appropriate default script. */
301 if (saved_script_handle
== false)
304 char *s
= ldemul_get_script (& isfile
);
307 ldfile_open_command_file (s
);
313 parser_input
= input_script
;
318 if (trace_file_tries
)
320 info_msg (_("using %s linker script:\n"),
321 saved_script_handle
? "external" : "internal");
322 info_msg ("==================================================\n");
324 if (saved_script_handle
)
326 const int BSIZE
= 8192;
328 char *buf
= xmalloc (BSIZE
);
330 rewind (saved_script_handle
);
331 while ((n
= fread (buf
, 1, BSIZE
- 1, saved_script_handle
)) > 0)
336 rewind (saved_script_handle
);
343 info_msg (ldemul_get_script (& isfile
));
346 info_msg ("\n==================================================\n");
351 if (lang_has_input_file
== false)
355 einfo (_("%P%F: no input files\n"));
360 info_msg (_("%P: mode %s\n"), emulation
);
363 ldemul_after_parse ();
365 if (config
.map_filename
)
367 if (strcmp (config
.map_filename
, "-") == 0)
369 config
.map_file
= stdout
;
373 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
374 if (config
.map_file
== (FILE *) NULL
)
376 bfd_set_error (bfd_error_system_call
);
377 einfo (_("%P%F: cannot open map file %s: %E\n"),
378 config
.map_filename
);
385 /* Print error messages for any missing symbols, for any warning
386 symbols, and possibly multiple definitions. */
388 if (! link_info
.relocateable
)
390 /* Look for a text section and switch the readonly attribute in it. */
391 asection
*found
= bfd_get_section_by_name (output_bfd
, ".text");
393 if (found
!= (asection
*) NULL
)
395 if (config
.text_read_only
)
396 found
->flags
|= SEC_READONLY
;
398 found
->flags
&= ~SEC_READONLY
;
402 if (link_info
.relocateable
)
403 output_bfd
->flags
&= ~EXEC_P
;
405 output_bfd
->flags
|= EXEC_P
;
409 if (config
.map_file
!= NULL
)
411 if (command_line
.cref
)
412 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
413 if (nocrossref_list
!= NULL
)
414 check_nocrossrefs ();
416 /* Even if we're producing relocateable output, some non-fatal errors should
417 be reported in the exit status. (What non-fatal errors, if any, do we
418 want to ignore for relocateable output?) */
420 if (config
.make_executable
== false && force_make_executable
== false)
422 if (trace_files
== true)
424 einfo (_("%P: link errors found, deleting executable `%s'\n"),
428 /* The file will be removed by remove_output. */
434 if (! bfd_close (output_bfd
))
435 einfo (_("%F%B: final close failed: %E\n"), output_bfd
);
437 /* If the --force-exe-suffix is enabled, and we're making an
438 executable file and it doesn't end in .exe, copy it to one
440 if (! link_info
.relocateable
&& command_line
.force_exe_suffix
)
442 int len
= strlen (output_filename
);
444 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
445 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
449 const int bsize
= 4096;
450 char *buf
= xmalloc (bsize
);
452 char *dst_name
= xmalloc (len
+ 5);
453 strcpy (dst_name
, output_filename
);
454 strcat (dst_name
, ".exe");
455 src
= fopen (output_filename
, FOPEN_RB
);
456 dst
= fopen (dst_name
, FOPEN_WB
);
459 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename
);
461 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name
);
462 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
464 int done
= fwrite (buf
, 1, l
, dst
);
467 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
471 if (fclose (dst
) == EOF
)
473 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
481 END_PROGRESS (program_name
);
486 char *lim
= (char *) sbrk (0);
488 long run_time
= get_run_time () - start_time
;
490 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
491 program_name
, run_time
/ 1000000, run_time
% 1000000);
493 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
494 (long) (lim
- (char *) &environ
));
498 /* Prevent remove_output from doing anything, after a successful link. */
499 output_filename
= NULL
;
505 /* We need to find any explicitly given emulation in order to initialize the
506 state that's needed by the lex&yacc argument parser (parse_args). */
509 get_emulation (argc
, argv
)
516 emulation
= getenv (EMULATION_ENVIRON
);
517 if (emulation
== NULL
)
518 emulation
= DEFAULT_EMULATION
;
520 for (i
= 1; i
< argc
; i
++)
522 if (!strncmp (argv
[i
], "-m", 2))
524 if (argv
[i
][2] == '\0')
529 emulation
= argv
[i
+ 1];
534 einfo (_("%P%F: missing argument to -m\n"));
537 else if (strcmp (argv
[i
], "-mips1") == 0
538 || strcmp (argv
[i
], "-mips2") == 0
539 || strcmp (argv
[i
], "-mips3") == 0
540 || strcmp (argv
[i
], "-mips4") == 0
541 || strcmp (argv
[i
], "-mips5") == 0)
543 /* FIXME: The arguments -mips1, -mips2 and -mips3 are
544 passed to the linker by some MIPS compilers. They
545 generally tell the linker to use a slightly different
546 library path. Perhaps someday these should be
547 implemented as emulations; until then, we just ignore
548 the arguments and hope that nobody ever creates
549 emulations named ips1, ips2 or ips3. */
551 else if (strcmp (argv
[i
], "-m486") == 0)
553 /* FIXME: The argument -m486 is passed to the linker on
554 some Linux systems. Hope that nobody creates an
555 emulation named 486. */
560 emulation
= &argv
[i
][2];
568 /* If directory DIR contains an "ldscripts" subdirectory,
569 add DIR to the library search path and return true,
570 else return false. */
573 check_for_scripts_dir (dir
)
581 dirlen
= strlen (dir
);
582 /* sizeof counts the terminating NUL. */
583 buf
= (char *) xmalloc (dirlen
+ sizeof ("/ldscripts"));
584 sprintf (buf
, "%s/ldscripts", dir
);
586 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
589 ldfile_add_library_path (dir
, false);
593 /* Set the default directory for finding script files.
594 Libraries will be searched for here too, but that's ok.
595 We look for the "ldscripts" directory in:
597 SCRIPTDIR (passed from Makefile)
598 the dir where this program is (for using it from the build tree)
599 the dir where this program is/../lib (for installing the tool suite elsewhere) */
607 if (check_for_scripts_dir (SCRIPTDIR
))
608 /* We've been installed normally. */
611 /* Look for "ldscripts" in the dir where our binary is. */
612 end
= strrchr (program_name
, '/');
613 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
615 /* We could have \foo\bar, or /foo\bar. */
616 char *bslash
= strrchr (program_name
, '\\');
617 if (end
== NULL
|| (bslash
!= NULL
&& bslash
> end
))
624 /* Don't look for ldscripts in the current directory. There is
625 too much potential for confusion. */
629 dirlen
= end
- program_name
;
630 /* Make a copy of program_name in dir.
631 Leave room for later "/../lib". */
632 dir
= (char *) xmalloc (dirlen
+ 8);
633 strncpy (dir
, program_name
, dirlen
);
636 if (check_for_scripts_dir (dir
))
637 /* Don't free dir. */
640 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
641 strcpy (dir
+ dirlen
, "/../lib");
642 if (check_for_scripts_dir (dir
))
645 /* Well, we tried. */
653 if (link_info
.notice_hash
== (struct bfd_hash_table
*) NULL
)
655 link_info
.notice_hash
= ((struct bfd_hash_table
*)
656 xmalloc (sizeof (struct bfd_hash_table
)));
657 if (! bfd_hash_table_init_n (link_info
.notice_hash
,
660 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
663 if (bfd_hash_lookup (link_info
.notice_hash
, name
, true, true)
664 == (struct bfd_hash_entry
*) NULL
)
665 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
668 /* Record a symbol to be wrapped, from the --wrap option. */
674 if (link_info
.wrap_hash
== NULL
)
676 link_info
.wrap_hash
= ((struct bfd_hash_table
*)
677 xmalloc (sizeof (struct bfd_hash_table
)));
678 if (! bfd_hash_table_init_n (link_info
.wrap_hash
,
681 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
683 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, true, true) == NULL
)
684 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
687 /* Handle the -retain-symbols-file option. */
690 add_keepsyms_file (filename
)
691 const char *filename
;
698 if (link_info
.strip
== strip_some
)
699 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
701 file
= fopen (filename
, "r");
702 if (file
== (FILE *) NULL
)
704 bfd_set_error (bfd_error_system_call
);
705 einfo ("%X%P: %s: %E\n", filename
);
709 link_info
.keep_hash
= ((struct bfd_hash_table
*)
710 xmalloc (sizeof (struct bfd_hash_table
)));
711 if (! bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
))
712 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
715 buf
= (char *) xmalloc (bufsize
);
727 while (! isspace (c
) && c
!= EOF
)
734 buf
= xrealloc (buf
, bufsize
);
741 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, true, true)
742 == (struct bfd_hash_entry
*) NULL
)
743 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
747 if (link_info
.strip
!= strip_none
)
748 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
750 link_info
.strip
= strip_some
;
753 /* Callbacks from the BFD linker routines. */
755 /* This is called when BFD has decided to include an archive member in
759 add_archive_element (info
, abfd
, name
)
760 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
764 lang_input_statement_type
*input
;
766 input
= ((lang_input_statement_type
*)
767 xmalloc (sizeof (lang_input_statement_type
)));
768 input
->filename
= abfd
->filename
;
769 input
->local_sym_name
= abfd
->filename
;
770 input
->the_bfd
= abfd
;
771 input
->asymbols
= NULL
;
773 input
->just_syms_flag
= false;
774 input
->loaded
= false;
775 input
->search_dirs_flag
= false;
777 /* FIXME: The following fields are not set: header.next,
778 header.type, closed, passive_position, symbol_count,
779 next_real_file, is_archive, target, real. This bit of code is
780 from the old decode_library_subfile function. I don't know
781 whether any of those fields matters. */
783 ldlang_add_file (input
);
785 if (config
.map_file
!= (FILE *) NULL
)
787 static boolean header_printed
;
788 struct bfd_link_hash_entry
*h
;
792 h
= bfd_link_hash_lookup (link_info
.hash
, name
, false, false, true);
804 case bfd_link_hash_defined
:
805 case bfd_link_hash_defweak
:
806 from
= h
->u
.def
.section
->owner
;
809 case bfd_link_hash_undefined
:
810 case bfd_link_hash_undefweak
:
811 from
= h
->u
.undef
.abfd
;
814 case bfd_link_hash_common
:
815 from
= h
->u
.c
.p
->section
->owner
;
820 if (! header_printed
)
824 sprintf (buf
, "%-29s %s\n\n", _("Archive member included"),
825 _("because of file (symbol)"));
827 header_printed
= true;
830 if (bfd_my_archive (abfd
) == NULL
)
832 minfo ("%s", bfd_get_filename (abfd
));
833 len
= strlen (bfd_get_filename (abfd
));
837 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
838 bfd_get_filename (abfd
));
839 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
840 + strlen (bfd_get_filename (abfd
))
858 minfo ("(%T)\n", h
->root
.string
);
860 minfo ("(%s)\n", name
);
863 if (trace_files
|| trace_file_tries
)
864 info_msg ("%I\n", input
);
869 /* This is called when BFD has discovered a symbol which is defined
873 multiple_definition (info
, name
, obfd
, osec
, oval
, nbfd
, nsec
, nval
)
874 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
883 /* If either section has the output_section field set to
884 bfd_abs_section_ptr, it means that the section is being
885 discarded, and this is not really a multiple definition at all.
886 FIXME: It would be cleaner to somehow ignore symbols defined in
887 sections which are being discarded. */
888 if ((osec
->output_section
!= NULL
889 && ! bfd_is_abs_section (osec
)
890 && bfd_is_abs_section (osec
->output_section
))
891 || (nsec
->output_section
!= NULL
892 && ! bfd_is_abs_section (nsec
)
893 && bfd_is_abs_section (nsec
->output_section
)))
896 einfo (_("%X%C: multiple definition of `%T'\n"),
897 nbfd
, nsec
, nval
, name
);
898 if (obfd
!= (bfd
*) NULL
)
899 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
901 if (command_line
.relax
)
903 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
904 command_line
.relax
= 0;
910 /* This is called when there is a definition of a common symbol, or
911 when a common symbol is found for a symbol that is already defined,
912 or when two common symbols are found. We only do something if
913 -warn-common was used. */
916 multiple_common (info
, name
, obfd
, otype
, osize
, nbfd
, ntype
, nsize
)
917 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
920 enum bfd_link_hash_type otype
;
923 enum bfd_link_hash_type ntype
;
926 if (! config
.warn_common
)
929 if (ntype
== bfd_link_hash_defined
930 || ntype
== bfd_link_hash_defweak
931 || ntype
== bfd_link_hash_indirect
)
933 ASSERT (otype
== bfd_link_hash_common
);
934 einfo (_("%B: warning: definition of `%T' overriding common\n"),
937 einfo (_("%B: warning: common is here\n"), obfd
);
939 else if (otype
== bfd_link_hash_defined
940 || otype
== bfd_link_hash_defweak
941 || otype
== bfd_link_hash_indirect
)
943 ASSERT (ntype
== bfd_link_hash_common
);
944 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
947 einfo (_("%B: warning: defined here\n"), obfd
);
951 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
954 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
957 einfo (_("%B: warning: larger common is here\n"), obfd
);
959 else if (nsize
> osize
)
961 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
964 einfo (_("%B: warning: smaller common is here\n"), obfd
);
968 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
970 einfo (_("%B: warning: previous common is here\n"), obfd
);
977 /* This is called when BFD has discovered a set element. H is the
978 entry in the linker hash table for the set. SECTION and VALUE
979 represent a value which should be added to the set. */
982 add_to_set (info
, h
, reloc
, abfd
, section
, value
)
983 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
984 struct bfd_link_hash_entry
*h
;
985 bfd_reloc_code_real_type reloc
;
990 if (config
.warn_constructors
)
991 einfo (_("%P: warning: global constructor %s used\n"),
994 if (! config
.build_constructors
)
997 ldctor_add_set_entry (h
, reloc
, (const char *) NULL
, section
, value
);
999 if (h
->type
== bfd_link_hash_new
)
1001 h
->type
= bfd_link_hash_undefined
;
1002 h
->u
.undef
.abfd
= abfd
;
1003 /* We don't call bfd_link_add_undef to add this to the list of
1004 undefined symbols because we are going to define it
1011 /* This is called when BFD has discovered a constructor. This is only
1012 called for some object file formats--those which do not handle
1013 constructors in some more clever fashion. This is similar to
1014 adding an element to a set, but less general. */
1017 constructor_callback (info
, constructor
, name
, abfd
, section
, value
)
1018 struct bfd_link_info
*info
;
1019 boolean constructor
;
1026 struct bfd_link_hash_entry
*h
;
1027 char set_name
[1 + sizeof "__CTOR_LIST__"];
1029 if (config
.warn_constructors
)
1030 einfo (_("%P: warning: global constructor %s used\n"), name
);
1032 if (! config
.build_constructors
)
1035 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1036 useful error message. */
1037 if (bfd_reloc_type_lookup (output_bfd
, BFD_RELOC_CTOR
) == NULL
1038 && (link_info
.relocateable
1039 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1040 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1043 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1044 *s
++ = bfd_get_symbol_leading_char (abfd
);
1046 strcpy (s
, "__CTOR_LIST__");
1048 strcpy (s
, "__DTOR_LIST__");
1050 h
= bfd_link_hash_lookup (info
->hash
, set_name
, true, true, true);
1051 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1052 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1053 if (h
->type
== bfd_link_hash_new
)
1055 h
->type
= bfd_link_hash_undefined
;
1056 h
->u
.undef
.abfd
= abfd
;
1057 /* We don't call bfd_link_add_undef to add this to the list of
1058 undefined symbols because we are going to define it
1062 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1066 /* A structure used by warning_callback to pass information through
1067 bfd_map_over_sections. */
1069 struct warning_callback_info
{
1071 const char *warning
;
1076 /* This is called when there is a reference to a warning symbol. */
1079 warning_callback (info
, warning
, symbol
, abfd
, section
, address
)
1080 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1081 const char *warning
;
1087 /* This is a hack to support warn_multiple_gp. FIXME: This should
1088 have a cleaner interface, but what? */
1089 if (! config
.warn_multiple_gp
1090 && strcmp (warning
, "using multiple gp values") == 0)
1093 if (section
!= NULL
)
1094 einfo ("%C: %s\n", abfd
, section
, address
, warning
);
1095 else if (abfd
== NULL
)
1096 einfo ("%P: %s\n", warning
);
1097 else if (symbol
== NULL
)
1098 einfo ("%B: %s\n", abfd
, warning
);
1101 lang_input_statement_type
*entry
;
1103 struct warning_callback_info info
;
1105 /* Look through the relocs to see if we can find a plausible
1108 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1109 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1110 asymbols
= entry
->asymbols
;
1116 symsize
= bfd_get_symtab_upper_bound (abfd
);
1118 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1119 asymbols
= (asymbol
**) xmalloc (symsize
);
1120 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1121 if (symbol_count
< 0)
1122 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1125 entry
->asymbols
= asymbols
;
1126 entry
->symbol_count
= symbol_count
;
1131 info
.warning
= warning
;
1132 info
.symbol
= symbol
;
1133 info
.asymbols
= asymbols
;
1134 bfd_map_over_sections (abfd
, warning_find_reloc
, (PTR
) &info
);
1137 einfo ("%B: %s\n", abfd
, warning
);
1146 /* This is called by warning_callback for each section. It checks the
1147 relocs of the section to see if it can find a reference to the
1148 symbol which triggered the warning. If it can, it uses the reloc
1149 to give an error message with a file and line number. */
1152 warning_find_reloc (abfd
, sec
, iarg
)
1157 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1161 arelent
**p
, **pend
;
1166 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1168 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1172 relpp
= (arelent
**) xmalloc (relsize
);
1173 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1175 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1178 pend
= p
+ relcount
;
1179 for (; p
< pend
&& *p
!= NULL
; p
++)
1183 if (q
->sym_ptr_ptr
!= NULL
1184 && *q
->sym_ptr_ptr
!= NULL
1185 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1187 /* We found a reloc for the symbol we are looking for. */
1188 einfo ("%C: %s\n", abfd
, sec
, q
->address
, info
->warning
);
1197 /* This is called when an undefined symbol is found. */
1200 undefined_symbol (info
, name
, abfd
, section
, address
, fatal
)
1201 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1206 boolean fatal ATTRIBUTE_UNUSED
;
1208 static char *error_name
;
1209 static unsigned int error_count
;
1211 #define MAX_ERRORS_IN_A_ROW 5
1213 if (config
.warn_once
)
1215 static struct bfd_hash_table
*hash
;
1217 /* Only warn once about a particular undefined symbol. */
1221 hash
= ((struct bfd_hash_table
*)
1222 xmalloc (sizeof (struct bfd_hash_table
)));
1223 if (! bfd_hash_table_init (hash
, bfd_hash_newfunc
))
1224 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1227 if (bfd_hash_lookup (hash
, name
, false, false) != NULL
)
1230 if (bfd_hash_lookup (hash
, name
, true, true) == NULL
)
1231 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1234 /* We never print more than a reasonable number of errors in a row
1235 for a single symbol. */
1236 if (error_name
!= (char *) NULL
1237 && strcmp (name
, error_name
) == 0)
1242 if (error_name
!= (char *) NULL
)
1244 error_name
= xstrdup (name
);
1247 if (section
!= NULL
)
1249 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1251 einfo (_("%C: undefined reference to `%T'\n"),
1252 abfd
, section
, address
, name
);
1256 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1257 einfo (_("%D: more undefined references to `%T' follow\n"),
1258 abfd
, section
, address
, name
);
1262 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1264 einfo (_("%B: undefined reference to `%T'\n"),
1269 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1270 einfo (_("%B: more undefined references to `%T' follow\n"),
1277 /* This is called when a reloc overflows. */
1280 reloc_overflow (info
, name
, reloc_name
, addend
, abfd
, section
, address
)
1281 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1283 const char *reloc_name
;
1289 if (abfd
== (bfd
*) NULL
)
1290 einfo (_("%P%X: generated"));
1292 einfo ("%X%C:", abfd
, section
, address
);
1293 einfo (_(" relocation truncated to fit: %s %T"), reloc_name
, name
);
1295 einfo ("+%v", addend
);
1300 /* This is called when a dangerous relocation is made. */
1303 reloc_dangerous (info
, message
, abfd
, section
, address
)
1304 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1305 const char *message
;
1310 if (abfd
== (bfd
*) NULL
)
1311 einfo (_("%P%X: generated"));
1313 einfo ("%X%C:", abfd
, section
, address
);
1314 einfo (_("dangerous relocation: %s\n"), message
);
1318 /* This is called when a reloc is being generated attached to a symbol
1319 that is not being output. */
1322 unattached_reloc (info
, name
, abfd
, section
, address
)
1323 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
1329 if (abfd
== (bfd
*) NULL
)
1330 einfo (_("%P%X: generated"));
1332 einfo ("%X%C:", abfd
, section
, address
);
1333 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name
);
1337 /* This is called if link_info.notice_all is set, or when a symbol in
1338 link_info.notice_hash is found. Symbols are put in notice_hash
1339 using the -y option. */
1342 notice (info
, name
, abfd
, section
, value
)
1343 struct bfd_link_info
*info
;
1349 if (! info
->notice_all
1350 || (info
->notice_hash
!= NULL
1351 && bfd_hash_lookup (info
->notice_hash
, name
, false, false) != NULL
))
1353 if (bfd_is_und_section (section
))
1354 einfo ("%B: reference to %s\n", abfd
, name
);
1356 einfo ("%B: definition of %s\n", abfd
, name
);
1359 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1360 add_cref (name
, abfd
, section
, value
);