1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006
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, 51 Franklin Street - Fifth Floor, 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)
58 #ifndef TARGET_SYSTEM_ROOT
59 #define TARGET_SYSTEM_ROOT ""
65 const char *output_filename
= "a.out";
67 /* Name this program was invoked by. */
70 /* The prefix for system library directories. */
71 const char *ld_sysroot
;
73 /* The canonical representation of ld_sysroot. */
74 char * ld_canon_sysroot
;
75 int ld_canon_sysroot_len
;
77 /* The file that we're creating. */
80 /* Set by -G argument, for MIPS ECOFF target. */
81 int g_switch_value
= 8;
83 /* Nonzero means print names of input files as processed. */
84 bfd_boolean trace_files
;
86 /* Nonzero means same, but note open failures, too. */
87 bfd_boolean trace_file_tries
;
89 /* Nonzero means version number was printed, so exit successfully
90 instead of complaining if no input files are given. */
91 bfd_boolean version_printed
;
93 /* Nonzero means link in every member of an archive. */
94 bfd_boolean whole_archive
;
96 /* Nonzero means create DT_NEEDED entries only if a dynamic library
97 actually satisfies some reference in a regular object. */
98 bfd_boolean as_needed
;
100 /* Nonzero means never create DT_NEEDED entries for dynamic libraries
101 in DT_NEEDED tags. */
102 bfd_boolean add_needed
= TRUE
;
104 /* TRUE if we should demangle symbol names. */
105 bfd_boolean demangling
;
107 args_type command_line
;
109 ld_config_type config
;
111 sort_type sort_section
;
113 static const char *get_sysroot
115 static char *get_emulation
117 static void set_scripts_dir
119 static bfd_boolean add_archive_element
120 (struct bfd_link_info
*, bfd
*, const char *);
121 static bfd_boolean multiple_definition
122 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
,
123 bfd
*, asection
*, bfd_vma
);
124 static bfd_boolean multiple_common
125 (struct bfd_link_info
*, const char *, bfd
*, enum bfd_link_hash_type
,
126 bfd_vma
, bfd
*, enum bfd_link_hash_type
, bfd_vma
);
127 static bfd_boolean add_to_set
128 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
129 bfd_reloc_code_real_type
, bfd
*, asection
*, bfd_vma
);
130 static bfd_boolean constructor_callback
131 (struct bfd_link_info
*, bfd_boolean
, const char *, bfd
*,
132 asection
*, bfd_vma
);
133 static bfd_boolean warning_callback
134 (struct bfd_link_info
*, const char *, const char *, bfd
*,
135 asection
*, bfd_vma
);
136 static void warning_find_reloc
137 (bfd
*, asection
*, void *);
138 static bfd_boolean undefined_symbol
139 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
,
141 static bfd_boolean reloc_overflow
142 (struct bfd_link_info
*, struct bfd_link_hash_entry
*, const char *,
143 const char *, bfd_vma
, bfd
*, asection
*, bfd_vma
);
144 static bfd_boolean reloc_dangerous
145 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
146 static bfd_boolean unattached_reloc
147 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
148 static bfd_boolean notice
149 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
151 static struct bfd_link_callbacks link_callbacks
=
157 constructor_callback
,
167 struct bfd_link_info link_info
;
175 bfd_cache_close (output_bfd
);
176 if (delete_output_file_on_failure
)
177 unlink_if_ordinary (output_filename
);
182 main (int argc
, char **argv
)
185 long start_time
= get_run_time ();
187 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
188 setlocale (LC_MESSAGES
, "");
190 #if defined (HAVE_SETLOCALE)
191 setlocale (LC_CTYPE
, "");
193 bindtextdomain (PACKAGE
, LOCALEDIR
);
194 textdomain (PACKAGE
);
196 program_name
= argv
[0];
197 xmalloc_set_program_name (program_name
);
199 START_PROGRESS (program_name
, 0);
201 expandargv (&argc
, &argv
);
205 bfd_set_error_program_name (program_name
);
207 xatexit (remove_output
);
209 /* Set up the sysroot directory. */
210 ld_sysroot
= get_sysroot (argc
, argv
);
213 if (*TARGET_SYSTEM_ROOT
== 0)
215 einfo ("%P%F: this linker was not configured to use sysroots\n");
219 ld_canon_sysroot
= lrealpath (ld_sysroot
);
221 if (ld_canon_sysroot
)
222 ld_canon_sysroot_len
= strlen (ld_canon_sysroot
);
224 ld_canon_sysroot_len
= -1;
226 /* Set the default BFD target based on the configured target. Doing
227 this permits the linker to be configured for a particular target,
228 and linked against a shared BFD library which was configured for
229 a different target. The macro TARGET is defined by Makefile. */
230 if (! bfd_set_default_target (TARGET
))
232 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
243 /* Initialize the data about options. */
244 trace_files
= trace_file_tries
= version_printed
= FALSE
;
245 whole_archive
= FALSE
;
246 config
.build_constructors
= TRUE
;
247 config
.dynamic_link
= FALSE
;
248 config
.has_shared
= FALSE
;
249 config
.split_by_reloc
= (unsigned) -1;
250 config
.split_by_file
= (bfd_size_type
) -1;
251 config
.hash_table_size
= 0;
252 command_line
.force_common_definition
= FALSE
;
253 command_line
.inhibit_common_definition
= FALSE
;
254 command_line
.interpreter
= NULL
;
255 command_line
.rpath
= NULL
;
256 command_line
.warn_mismatch
= TRUE
;
257 command_line
.check_section_addresses
= TRUE
;
258 command_line
.accept_unknown_input_arch
= FALSE
;
259 command_line
.reduce_memory_overheads
= FALSE
;
263 /* We initialize DEMANGLING based on the environment variable
264 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
265 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
266 environment. Acting the same way here lets us provide the same
267 interface by default. */
268 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
270 link_info
.relocatable
= FALSE
;
271 link_info
.emitrelocations
= FALSE
;
272 link_info
.task_link
= FALSE
;
273 link_info
.shared
= FALSE
;
274 link_info
.pie
= FALSE
;
275 link_info
.executable
= FALSE
;
276 link_info
.symbolic
= FALSE
;
277 link_info
.export_dynamic
= FALSE
;
278 link_info
.static_link
= FALSE
;
279 link_info
.traditional_format
= FALSE
;
280 link_info
.optimize
= FALSE
;
281 link_info
.unresolved_syms_in_objects
= RM_NOT_YET_SET
;
282 link_info
.unresolved_syms_in_shared_libs
= RM_NOT_YET_SET
;
283 link_info
.allow_multiple_definition
= FALSE
;
284 link_info
.allow_undefined_version
= TRUE
;
285 link_info
.create_default_symver
= FALSE
;
286 link_info
.default_imported_symver
= FALSE
;
287 link_info
.keep_memory
= TRUE
;
288 link_info
.notice_all
= FALSE
;
289 link_info
.nocopyreloc
= FALSE
;
290 link_info
.new_dtags
= FALSE
;
291 link_info
.combreloc
= TRUE
;
292 link_info
.eh_frame_hdr
= FALSE
;
293 link_info
.relro
= FALSE
;
294 link_info
.strip_discarded
= TRUE
;
295 link_info
.strip
= strip_none
;
296 link_info
.discard
= discard_sec_merge
;
297 link_info
.common_skip_ar_aymbols
= bfd_link_common_skip_none
;
298 link_info
.callbacks
= &link_callbacks
;
299 link_info
.hash
= NULL
;
300 link_info
.keep_hash
= NULL
;
301 link_info
.notice_hash
= NULL
;
302 link_info
.wrap_hash
= NULL
;
303 link_info
.input_bfds
= NULL
;
304 link_info
.create_object_symbols_section
= NULL
;
305 link_info
.gc_sym_list
= NULL
;
306 link_info
.base_file
= NULL
;
307 link_info
.emit_hash
= TRUE
;
308 link_info
.emit_gnu_hash
= FALSE
;
309 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
310 and _fini symbols. We are compatible. */
311 link_info
.init_function
= "_init";
312 link_info
.fini_function
= "_fini";
313 link_info
.pei386_auto_import
= -1;
314 link_info
.pei386_runtime_pseudo_reloc
= FALSE
;
315 link_info
.spare_dynamic_tags
= 5;
317 link_info
.flags_1
= 0;
318 link_info
.relax_pass
= 1;
319 link_info
.warn_shared_textrel
= FALSE
;
320 link_info
.gc_sections
= FALSE
;
321 link_info
.print_gc_sections
= FALSE
;
323 config
.maxpagesize
= 0;
324 config
.commonpagesize
= 0;
326 ldfile_add_arch ("");
328 config
.make_executable
= TRUE
;
329 force_make_executable
= FALSE
;
330 config
.magic_demand_paged
= TRUE
;
331 config
.text_read_only
= TRUE
;
333 emulation
= get_emulation (argc
, argv
);
334 ldemul_choose_mode (emulation
);
335 default_target
= ldemul_choose_target (argc
, argv
);
337 ldemul_before_parse ();
338 lang_has_input_file
= FALSE
;
339 parse_args (argc
, argv
);
341 if (config
.hash_table_size
!= 0)
342 bfd_hash_set_default_size (config
.hash_table_size
);
344 if (config
.maxpagesize
!= 0)
345 bfd_emul_set_maxpagesize (default_target
, config
.maxpagesize
);
347 if (config
.commonpagesize
!= 0)
348 bfd_emul_set_commonpagesize (default_target
,
349 config
.commonpagesize
);
351 ldemul_set_symbols ();
353 if (link_info
.relocatable
)
355 if (link_info
.gc_sections
)
356 einfo ("%P%F: --gc-sections and -r may not be used together\n");
357 else if (command_line
.relax
)
358 einfo (_("%P%F: --relax and -r may not be used together\n"));
359 if (link_info
.shared
)
360 einfo (_("%P%F: -r and -shared may not be used together\n"));
363 if (! link_info
.shared
)
365 if (command_line
.filter_shlib
)
366 einfo (_("%P%F: -F may not be used without -shared\n"));
367 if (command_line
.auxiliary_filters
)
368 einfo (_("%P%F: -f may not be used without -shared\n"));
371 if (! link_info
.shared
|| link_info
.pie
)
372 link_info
.executable
= TRUE
;
374 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
375 don't see how else this can be handled, since in this case we
376 must preserve all externally visible symbols. */
377 if (link_info
.relocatable
&& link_info
.strip
== strip_all
)
379 link_info
.strip
= strip_debugger
;
380 if (link_info
.discard
== discard_sec_merge
)
381 link_info
.discard
= discard_all
;
384 /* This essentially adds another -L directory so this must be done after
385 the -L's in argv have been processed. */
388 /* If we have not already opened and parsed a linker script
389 read the emulation's appropriate default script. */
390 if (saved_script_handle
== NULL
)
393 char *s
= ldemul_get_script (&isfile
);
396 ldfile_open_command_file (s
);
402 parser_input
= input_script
;
407 if (trace_file_tries
)
409 if (saved_script_handle
)
410 info_msg (_("using external linker script:"));
412 info_msg (_("using internal linker script:"));
413 info_msg ("\n==================================================\n");
415 if (saved_script_handle
)
417 static const int ld_bufsz
= 8193;
419 char *buf
= xmalloc (ld_bufsz
);
421 rewind (saved_script_handle
);
422 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
427 rewind (saved_script_handle
);
434 info_msg (ldemul_get_script (&isfile
));
437 info_msg ("\n==================================================\n");
442 if (!lang_has_input_file
)
446 einfo (_("%P%F: no input files\n"));
450 info_msg (_("%P: mode %s\n"), emulation
);
452 ldemul_after_parse ();
454 if (config
.map_filename
)
456 if (strcmp (config
.map_filename
, "-") == 0)
458 config
.map_file
= stdout
;
462 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
463 if (config
.map_file
== (FILE *) NULL
)
465 bfd_set_error (bfd_error_system_call
);
466 einfo (_("%P%F: cannot open map file %s: %E\n"),
467 config
.map_filename
);
474 /* Print error messages for any missing symbols, for any warning
475 symbols, and possibly multiple definitions. */
476 if (link_info
.relocatable
)
477 output_bfd
->flags
&= ~EXEC_P
;
479 output_bfd
->flags
|= EXEC_P
;
483 if (config
.map_file
!= NULL
)
485 if (command_line
.cref
)
486 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
487 if (nocrossref_list
!= NULL
)
488 check_nocrossrefs ();
492 /* Even if we're producing relocatable output, some non-fatal errors should
493 be reported in the exit status. (What non-fatal errors, if any, do we
494 want to ignore for relocatable output?) */
495 if (!config
.make_executable
&& !force_make_executable
)
498 einfo (_("%P: link errors found, deleting executable `%s'\n"),
501 /* The file will be removed by remove_output. */
506 if (! bfd_close (output_bfd
))
507 einfo (_("%F%B: final close failed: %E\n"), output_bfd
);
509 /* If the --force-exe-suffix is enabled, and we're making an
510 executable file and it doesn't end in .exe, copy it to one
512 if (! link_info
.relocatable
&& command_line
.force_exe_suffix
)
514 int len
= strlen (output_filename
);
517 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
518 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
522 const int bsize
= 4096;
523 char *buf
= xmalloc (bsize
);
525 char *dst_name
= xmalloc (len
+ 5);
527 strcpy (dst_name
, output_filename
);
528 strcat (dst_name
, ".exe");
529 src
= fopen (output_filename
, FOPEN_RB
);
530 dst
= fopen (dst_name
, FOPEN_WB
);
533 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
536 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
538 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
540 int done
= fwrite (buf
, 1, l
, dst
);
543 einfo (_("%P: Error writing file `%s'\n"), dst_name
);
547 if (fclose (dst
) == EOF
)
548 einfo (_("%P: Error closing file `%s'\n"), dst_name
);
555 END_PROGRESS (program_name
);
560 char *lim
= sbrk (0);
562 long run_time
= get_run_time () - start_time
;
564 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
565 program_name
, run_time
/ 1000000, run_time
% 1000000);
567 fprintf (stderr
, _("%s: data size %ld\n"), program_name
,
568 (long) (lim
- (char *) &environ
));
572 /* Prevent remove_output from doing anything, after a successful link. */
573 output_filename
= NULL
;
579 /* If the configured sysroot is relocatable, try relocating it based on
580 default prefix FROM. Return the relocated directory if it exists,
581 otherwise return null. */
584 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED
)
586 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
590 path
= make_relative_prefix (program_name
, from
, TARGET_SYSTEM_ROOT
);
593 if (stat (path
, &s
) == 0 && S_ISDIR (s
.st_mode
))
601 /* Return the sysroot directory. Return "" if no sysroot is being used. */
604 get_sysroot (int argc
, char **argv
)
609 for (i
= 1; i
< argc
; i
++)
610 if (strncmp (argv
[i
], "--sysroot=", strlen ("--sysroot=")) == 0)
611 return argv
[i
] + strlen ("--sysroot=");
613 path
= get_relative_sysroot (BINDIR
);
617 path
= get_relative_sysroot (TOOLBINDIR
);
621 return TARGET_SYSTEM_ROOT
;
624 /* We need to find any explicitly given emulation in order to initialize the
625 state that's needed by the lex&yacc argument parser (parse_args). */
628 get_emulation (int argc
, char **argv
)
633 emulation
= getenv (EMULATION_ENVIRON
);
634 if (emulation
== NULL
)
635 emulation
= DEFAULT_EMULATION
;
637 for (i
= 1; i
< argc
; i
++)
639 if (!strncmp (argv
[i
], "-m", 2))
641 if (argv
[i
][2] == '\0')
646 emulation
= argv
[i
+ 1];
650 einfo (_("%P%F: missing argument to -m\n"));
652 else if (strcmp (argv
[i
], "-mips1") == 0
653 || strcmp (argv
[i
], "-mips2") == 0
654 || strcmp (argv
[i
], "-mips3") == 0
655 || strcmp (argv
[i
], "-mips4") == 0
656 || strcmp (argv
[i
], "-mips5") == 0
657 || strcmp (argv
[i
], "-mips32") == 0
658 || strcmp (argv
[i
], "-mips32r2") == 0
659 || strcmp (argv
[i
], "-mips64") == 0
660 || strcmp (argv
[i
], "-mips64r2") == 0)
662 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
663 passed to the linker by some MIPS compilers. They
664 generally tell the linker to use a slightly different
665 library path. Perhaps someday these should be
666 implemented as emulations; until then, we just ignore
667 the arguments and hope that nobody ever creates
668 emulations named ips1, ips2 or ips3. */
670 else if (strcmp (argv
[i
], "-m486") == 0)
672 /* FIXME: The argument -m486 is passed to the linker on
673 some Linux systems. Hope that nobody creates an
674 emulation named 486. */
679 emulation
= &argv
[i
][2];
687 /* If directory DIR contains an "ldscripts" subdirectory,
688 add DIR to the library search path and return TRUE,
689 else return FALSE. */
692 check_for_scripts_dir (char *dir
)
699 dirlen
= strlen (dir
);
700 /* sizeof counts the terminating NUL. */
701 buf
= xmalloc (dirlen
+ sizeof ("/ldscripts"));
702 sprintf (buf
, "%s/ldscripts", dir
);
704 res
= stat (buf
, &s
) == 0 && S_ISDIR (s
.st_mode
);
707 ldfile_add_library_path (dir
, FALSE
);
711 /* Set the default directory for finding script files.
712 Libraries will be searched for here too, but that's ok.
713 We look for the "ldscripts" directory in:
715 SCRIPTDIR (passed from Makefile)
716 (adjusted according to the current location of the binary)
717 SCRIPTDIR (passed from Makefile)
718 the dir where this program is (for using it from the build tree)
719 the dir where this program is/../lib
720 (for installing the tool suite elsewhere). */
723 set_scripts_dir (void)
729 dir
= make_relative_prefix (program_name
, BINDIR
, SCRIPTDIR
);
732 found
= check_for_scripts_dir (dir
);
738 dir
= make_relative_prefix (program_name
, TOOLBINDIR
, SCRIPTDIR
);
741 found
= check_for_scripts_dir (dir
);
747 if (check_for_scripts_dir (SCRIPTDIR
))
748 /* We've been installed normally. */
751 /* Look for "ldscripts" in the dir where our binary is. */
752 end
= strrchr (program_name
, '/');
753 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
755 /* We could have \foo\bar, or /foo\bar. */
756 char *bslash
= strrchr (program_name
, '\\');
758 if (end
== NULL
|| (bslash
!= NULL
&& bslash
> end
))
764 /* Don't look for ldscripts in the current directory. There is
765 too much potential for confusion. */
768 dirlen
= end
- program_name
;
769 /* Make a copy of program_name in dir.
770 Leave room for later "/../lib". */
771 dir
= xmalloc (dirlen
+ 8);
772 strncpy (dir
, program_name
, dirlen
);
775 if (check_for_scripts_dir (dir
))
781 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
782 strcpy (dir
+ dirlen
, "/../lib");
783 check_for_scripts_dir (dir
);
788 add_ysym (const char *name
)
790 if (link_info
.notice_hash
== NULL
)
792 link_info
.notice_hash
= xmalloc (sizeof (struct bfd_hash_table
));
793 if (!bfd_hash_table_init_n (link_info
.notice_hash
,
795 sizeof (struct bfd_hash_entry
),
797 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
800 if (bfd_hash_lookup (link_info
.notice_hash
, name
, TRUE
, TRUE
) == NULL
)
801 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
804 /* Record a symbol to be wrapped, from the --wrap option. */
807 add_wrap (const char *name
)
809 if (link_info
.wrap_hash
== NULL
)
811 link_info
.wrap_hash
= xmalloc (sizeof (struct bfd_hash_table
));
812 if (!bfd_hash_table_init_n (link_info
.wrap_hash
,
814 sizeof (struct bfd_hash_entry
),
816 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
819 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, TRUE
, TRUE
) == NULL
)
820 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
823 /* Handle the -retain-symbols-file option. */
826 add_keepsyms_file (const char *filename
)
833 if (link_info
.strip
== strip_some
)
834 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
836 file
= fopen (filename
, "r");
839 bfd_set_error (bfd_error_system_call
);
840 einfo ("%X%P: %s: %E\n", filename
);
844 link_info
.keep_hash
= xmalloc (sizeof (struct bfd_hash_table
));
845 if (!bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
,
846 sizeof (struct bfd_hash_entry
)))
847 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
850 buf
= xmalloc (bufsize
);
862 while (! ISSPACE (c
) && c
!= EOF
)
869 buf
= xrealloc (buf
, bufsize
);
876 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, TRUE
, TRUE
) == NULL
)
877 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
881 if (link_info
.strip
!= strip_none
)
882 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
885 link_info
.strip
= strip_some
;
888 /* Callbacks from the BFD linker routines. */
890 /* This is called when BFD has decided to include an archive member in
894 add_archive_element (struct bfd_link_info
*info
,
898 lang_input_statement_type
*input
;
900 input
= xmalloc (sizeof (lang_input_statement_type
));
901 input
->filename
= abfd
->filename
;
902 input
->local_sym_name
= abfd
->filename
;
903 input
->the_bfd
= abfd
;
904 input
->asymbols
= NULL
;
906 input
->just_syms_flag
= FALSE
;
907 input
->loaded
= FALSE
;
908 input
->search_dirs_flag
= FALSE
;
910 /* FIXME: The following fields are not set: header.next,
911 header.type, closed, passive_position, symbol_count,
912 next_real_file, is_archive, target, real. This bit of code is
913 from the old decode_library_subfile function. I don't know
914 whether any of those fields matters. */
916 ldlang_add_file (input
);
918 if (config
.map_file
!= NULL
)
920 static bfd_boolean header_printed
;
921 struct bfd_link_hash_entry
*h
;
925 h
= bfd_link_hash_lookup (info
->hash
, name
, FALSE
, FALSE
, TRUE
);
937 case bfd_link_hash_defined
:
938 case bfd_link_hash_defweak
:
939 from
= h
->u
.def
.section
->owner
;
942 case bfd_link_hash_undefined
:
943 case bfd_link_hash_undefweak
:
944 from
= h
->u
.undef
.abfd
;
947 case bfd_link_hash_common
:
948 from
= h
->u
.c
.p
->section
->owner
;
953 if (! header_printed
)
957 sprintf (buf
, _("Archive member included because of file (symbol)\n\n"));
959 header_printed
= TRUE
;
962 if (bfd_my_archive (abfd
) == NULL
)
964 minfo ("%s", bfd_get_filename (abfd
));
965 len
= strlen (bfd_get_filename (abfd
));
969 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd
)),
970 bfd_get_filename (abfd
));
971 len
= (strlen (bfd_get_filename (bfd_my_archive (abfd
)))
972 + strlen (bfd_get_filename (abfd
))
990 minfo ("(%T)\n", h
->root
.string
);
992 minfo ("(%s)\n", name
);
995 if (trace_files
|| trace_file_tries
)
996 info_msg ("%I\n", input
);
1001 /* This is called when BFD has discovered a symbol which is defined
1005 multiple_definition (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1014 /* If either section has the output_section field set to
1015 bfd_abs_section_ptr, it means that the section is being
1016 discarded, and this is not really a multiple definition at all.
1017 FIXME: It would be cleaner to somehow ignore symbols defined in
1018 sections which are being discarded. */
1019 if ((osec
->output_section
!= NULL
1020 && ! bfd_is_abs_section (osec
)
1021 && bfd_is_abs_section (osec
->output_section
))
1022 || (nsec
->output_section
!= NULL
1023 && ! bfd_is_abs_section (nsec
)
1024 && bfd_is_abs_section (nsec
->output_section
)))
1027 einfo (_("%X%C: multiple definition of `%T'\n"),
1028 nbfd
, nsec
, nval
, name
);
1030 einfo (_("%D: first defined here\n"), obfd
, osec
, oval
);
1032 if (command_line
.relax
)
1034 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1035 command_line
.relax
= 0;
1041 /* This is called when there is a definition of a common symbol, or
1042 when a common symbol is found for a symbol that is already defined,
1043 or when two common symbols are found. We only do something if
1044 -warn-common was used. */
1047 multiple_common (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1050 enum bfd_link_hash_type otype
,
1053 enum bfd_link_hash_type ntype
,
1056 if (! config
.warn_common
)
1059 if (ntype
== bfd_link_hash_defined
1060 || ntype
== bfd_link_hash_defweak
1061 || ntype
== bfd_link_hash_indirect
)
1063 ASSERT (otype
== bfd_link_hash_common
);
1064 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1067 einfo (_("%B: warning: common is here\n"), obfd
);
1069 else if (otype
== bfd_link_hash_defined
1070 || otype
== bfd_link_hash_defweak
1071 || otype
== bfd_link_hash_indirect
)
1073 ASSERT (ntype
== bfd_link_hash_common
);
1074 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1077 einfo (_("%B: warning: defined here\n"), obfd
);
1081 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
1084 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1087 einfo (_("%B: warning: larger common is here\n"), obfd
);
1089 else if (nsize
> osize
)
1091 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1094 einfo (_("%B: warning: smaller common is here\n"), obfd
);
1098 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd
, name
);
1100 einfo (_("%B: warning: previous common is here\n"), obfd
);
1107 /* This is called when BFD has discovered a set element. H is the
1108 entry in the linker hash table for the set. SECTION and VALUE
1109 represent a value which should be added to the set. */
1112 add_to_set (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1113 struct bfd_link_hash_entry
*h
,
1114 bfd_reloc_code_real_type reloc
,
1119 if (config
.warn_constructors
)
1120 einfo (_("%P: warning: global constructor %s used\n"),
1123 if (! config
.build_constructors
)
1126 ldctor_add_set_entry (h
, reloc
, NULL
, section
, value
);
1128 if (h
->type
== bfd_link_hash_new
)
1130 h
->type
= bfd_link_hash_undefined
;
1131 h
->u
.undef
.abfd
= abfd
;
1132 /* We don't call bfd_link_add_undef to add this to the list of
1133 undefined symbols because we are going to define it
1140 /* This is called when BFD has discovered a constructor. This is only
1141 called for some object file formats--those which do not handle
1142 constructors in some more clever fashion. This is similar to
1143 adding an element to a set, but less general. */
1146 constructor_callback (struct bfd_link_info
*info
,
1147 bfd_boolean constructor
,
1154 struct bfd_link_hash_entry
*h
;
1155 char set_name
[1 + sizeof "__CTOR_LIST__"];
1157 if (config
.warn_constructors
)
1158 einfo (_("%P: warning: global constructor %s used\n"), name
);
1160 if (! config
.build_constructors
)
1163 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1164 useful error message. */
1165 if (bfd_reloc_type_lookup (output_bfd
, BFD_RELOC_CTOR
) == NULL
1166 && (info
->relocatable
1167 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1168 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1171 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1172 *s
++ = bfd_get_symbol_leading_char (abfd
);
1174 strcpy (s
, "__CTOR_LIST__");
1176 strcpy (s
, "__DTOR_LIST__");
1178 h
= bfd_link_hash_lookup (info
->hash
, set_name
, TRUE
, TRUE
, TRUE
);
1179 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1180 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1181 if (h
->type
== bfd_link_hash_new
)
1183 h
->type
= bfd_link_hash_undefined
;
1184 h
->u
.undef
.abfd
= abfd
;
1185 /* We don't call bfd_link_add_undef to add this to the list of
1186 undefined symbols because we are going to define it
1190 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1194 /* A structure used by warning_callback to pass information through
1195 bfd_map_over_sections. */
1197 struct warning_callback_info
1200 const char *warning
;
1205 /* This is called when there is a reference to a warning symbol. */
1208 warning_callback (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1209 const char *warning
,
1215 /* This is a hack to support warn_multiple_gp. FIXME: This should
1216 have a cleaner interface, but what? */
1217 if (! config
.warn_multiple_gp
1218 && strcmp (warning
, "using multiple gp values") == 0)
1221 if (section
!= NULL
)
1222 einfo ("%C: %s%s\n", abfd
, section
, address
, _("warning: "), warning
);
1223 else if (abfd
== NULL
)
1224 einfo ("%P: %s%s\n", _("warning: "), warning
);
1225 else if (symbol
== NULL
)
1226 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1229 lang_input_statement_type
*entry
;
1231 struct warning_callback_info info
;
1233 /* Look through the relocs to see if we can find a plausible
1235 entry
= (lang_input_statement_type
*) abfd
->usrdata
;
1236 if (entry
!= NULL
&& entry
->asymbols
!= NULL
)
1237 asymbols
= entry
->asymbols
;
1243 symsize
= bfd_get_symtab_upper_bound (abfd
);
1245 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1246 asymbols
= xmalloc (symsize
);
1247 symbol_count
= bfd_canonicalize_symtab (abfd
, asymbols
);
1248 if (symbol_count
< 0)
1249 einfo (_("%B%F: could not read symbols: %E\n"), abfd
);
1252 entry
->asymbols
= asymbols
;
1253 entry
->symbol_count
= symbol_count
;
1258 info
.warning
= warning
;
1259 info
.symbol
= symbol
;
1260 info
.asymbols
= asymbols
;
1261 bfd_map_over_sections (abfd
, warning_find_reloc
, &info
);
1264 einfo ("%B: %s%s\n", abfd
, _("warning: "), warning
);
1273 /* This is called by warning_callback for each section. It checks the
1274 relocs of the section to see if it can find a reference to the
1275 symbol which triggered the warning. If it can, it uses the reloc
1276 to give an error message with a file and line number. */
1279 warning_find_reloc (bfd
*abfd
, asection
*sec
, void *iarg
)
1281 struct warning_callback_info
*info
= iarg
;
1285 arelent
**p
, **pend
;
1290 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1292 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1296 relpp
= xmalloc (relsize
);
1297 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1299 einfo (_("%B%F: could not read relocs: %E\n"), abfd
);
1302 pend
= p
+ relcount
;
1303 for (; p
< pend
&& *p
!= NULL
; p
++)
1307 if (q
->sym_ptr_ptr
!= NULL
1308 && *q
->sym_ptr_ptr
!= NULL
1309 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1311 /* We found a reloc for the symbol we are looking for. */
1312 einfo ("%C: %s%s\n", abfd
, sec
, q
->address
, _("warning: "),
1322 /* This is called when an undefined symbol is found. */
1325 undefined_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1332 static char *error_name
;
1333 static unsigned int error_count
;
1335 #define MAX_ERRORS_IN_A_ROW 5
1337 if (config
.warn_once
)
1339 static struct bfd_hash_table
*hash
;
1341 /* Only warn once about a particular undefined symbol. */
1344 hash
= xmalloc (sizeof (struct bfd_hash_table
));
1345 if (!bfd_hash_table_init (hash
, bfd_hash_newfunc
,
1346 sizeof (struct bfd_hash_entry
)))
1347 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1350 if (bfd_hash_lookup (hash
, name
, FALSE
, FALSE
) != NULL
)
1353 if (bfd_hash_lookup (hash
, name
, TRUE
, TRUE
) == NULL
)
1354 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1357 /* We never print more than a reasonable number of errors in a row
1358 for a single symbol. */
1359 if (error_name
!= NULL
1360 && strcmp (name
, error_name
) == 0)
1365 if (error_name
!= NULL
)
1367 error_name
= xstrdup (name
);
1370 if (section
!= NULL
)
1372 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1375 einfo (_("%X%C: undefined reference to `%T'\n"),
1376 abfd
, section
, address
, name
);
1378 einfo (_("%C: warning: undefined reference to `%T'\n"),
1379 abfd
, section
, address
, name
);
1381 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1384 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1385 abfd
, section
, address
, name
);
1387 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1388 abfd
, section
, address
, name
);
1395 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1398 einfo (_("%X%B: undefined reference to `%T'\n"),
1401 einfo (_("%B: warning: undefined reference to `%T'\n"),
1404 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1407 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1410 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1420 /* Counter to limit the number of relocation overflow error messages
1421 to print. Errors are printed as it is decremented. When it's
1422 called and the counter is zero, a final message is printed
1423 indicating more relocations were omitted. When it gets to -1, no
1424 such errors are printed. If it's initially set to a value less
1425 than -1, all such errors will be printed (--verbose does this). */
1427 int overflow_cutoff_limit
= 10;
1429 /* This is called when a reloc overflows. */
1432 reloc_overflow (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1433 struct bfd_link_hash_entry
*entry
,
1435 const char *reloc_name
,
1441 if (overflow_cutoff_limit
== -1)
1444 einfo ("%X%C:", abfd
, section
, address
);
1446 if (overflow_cutoff_limit
>= 0
1447 && overflow_cutoff_limit
-- == 0)
1449 einfo (_(" additional relocation overflows omitted from the output\n"));
1455 while (entry
->type
== bfd_link_hash_indirect
1456 || entry
->type
== bfd_link_hash_warning
)
1457 entry
= entry
->u
.i
.link
;
1458 switch (entry
->type
)
1460 case bfd_link_hash_undefined
:
1461 case bfd_link_hash_undefweak
:
1462 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1463 reloc_name
, entry
->root
.string
);
1465 case bfd_link_hash_defined
:
1466 case bfd_link_hash_defweak
:
1467 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1468 reloc_name
, entry
->root
.string
,
1469 entry
->u
.def
.section
,
1470 entry
->u
.def
.section
== bfd_abs_section_ptr
1471 ? output_bfd
: entry
->u
.def
.section
->owner
);
1479 einfo (_(" relocation truncated to fit: %s against `%T'"),
1482 einfo ("+%v", addend
);
1487 /* This is called when a dangerous relocation is made. */
1490 reloc_dangerous (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1491 const char *message
,
1496 einfo (_("%X%C: dangerous relocation: %s\n"),
1497 abfd
, section
, address
, message
);
1501 /* This is called when a reloc is being generated attached to a symbol
1502 that is not being output. */
1505 unattached_reloc (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1511 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1512 abfd
, section
, address
, name
);
1516 /* This is called if link_info.notice_all is set, or when a symbol in
1517 link_info.notice_hash is found. Symbols are put in notice_hash
1518 using the -y option. */
1521 notice (struct bfd_link_info
*info
,
1529 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1530 return handle_asneeded_cref (abfd
, value
);
1534 if (! info
->notice_all
1535 || (info
->notice_hash
!= NULL
1536 && bfd_hash_lookup (info
->notice_hash
, name
, FALSE
, FALSE
) != NULL
))
1538 if (bfd_is_und_section (section
))
1539 einfo ("%B: reference to %s\n", abfd
, name
);
1541 einfo ("%B: definition of %s\n", abfd
, name
);
1544 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1545 add_cref (name
, abfd
, section
, value
);