1 /* Main program of GNU linker.
2 Copyright (C) 1991-2021 Free Software Foundation, Inc.
3 Written by Steve Chamberlain steve@cygnus.com
5 This file is part of the GNU Binutils.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 #include "safe-ctype.h"
25 #include "libiberty.h"
29 #include "filenames.h"
30 #include "elf/common.h"
43 #if BFD_SUPPORTS_PLUGINS
45 #include "plugin-api.h"
46 #endif /* BFD_SUPPORTS_PLUGINS */
48 /* Somewhere above, sys/stat.h got included. */
49 #if !defined(S_ISDIR) && defined(S_IFDIR)
50 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
55 #ifndef TARGET_SYSTEM_ROOT
56 #define TARGET_SYSTEM_ROOT ""
61 FILE *saved_script_handle
= NULL
;
62 FILE *previous_script_handle
= NULL
;
63 bool force_make_executable
= false;
66 const char *output_filename
= "a.out";
68 /* Name this program was invoked by. */
71 /* The prefix for system library directories. */
72 const char *ld_sysroot
;
74 /* The canonical representation of ld_sysroot. */
75 char *ld_canon_sysroot
;
76 int ld_canon_sysroot_len
;
78 /* Set by -G argument, for targets like MIPS ELF. */
79 int g_switch_value
= 8;
81 /* Nonzero means print names of input files as processed. */
82 unsigned int trace_files
;
84 /* Nonzero means report actions taken by the linker, and describe the linker script in use. */
87 /* Nonzero means version number was printed, so exit successfully
88 instead of complaining if no input files are given. */
91 /* TRUE if we should demangle symbol names. */
94 args_type command_line
;
96 ld_config_type config
;
98 sort_type sort_section
;
100 static const char *get_sysroot
102 static char *get_emulation
104 static bool add_archive_element
105 (struct bfd_link_info
*, bfd
*, const char *, bfd
**);
106 static void multiple_definition
107 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
108 bfd
*, asection
*, bfd_vma
);
109 static void multiple_common
110 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
111 bfd
*, enum bfd_link_hash_type
, bfd_vma
);
112 static void add_to_set
113 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
114 bfd_reloc_code_real_type
, bfd
*, asection
*, bfd_vma
);
115 static void constructor_callback
116 (struct bfd_link_info
*, bool, const char *, bfd
*,
117 asection
*, bfd_vma
);
118 static void warning_callback
119 (struct bfd_link_info
*, const char *, const char *, bfd
*,
120 asection
*, bfd_vma
);
121 static void warning_find_reloc
122 (bfd
*, asection
*, void *);
123 static void undefined_symbol
124 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
,
126 static void reloc_overflow
127 (struct bfd_link_info
*, struct bfd_link_hash_entry
*, const char *,
128 const char *, bfd_vma
, bfd
*, asection
*, bfd_vma
);
129 static void reloc_dangerous
130 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
131 static void unattached_reloc
132 (struct bfd_link_info
*, const char *, bfd
*, asection
*, bfd_vma
);
134 (struct bfd_link_info
*, struct bfd_link_hash_entry
*,
135 struct bfd_link_hash_entry
*, bfd
*, asection
*, bfd_vma
, flagword
);
137 static struct bfd_link_callbacks link_callbacks
=
143 constructor_callback
,
153 ldlang_override_segment_assignment
,
154 ldlang_ctf_acquire_strings
,
156 ldlang_ctf_new_dynsym
,
157 ldlang_write_ctf_late
160 static bfd_assert_handler_type default_bfd_assert_handler
;
161 static bfd_error_handler_type default_bfd_error_handler
;
163 struct bfd_link_info link_info
;
165 struct dependency_file
167 struct dependency_file
*next
;
171 static struct dependency_file
*dependency_files
, *dependency_files_tail
;
174 track_dependency_files (const char *filename
)
176 struct dependency_file
*dep
177 = (struct dependency_file
*) xmalloc (sizeof (*dep
));
178 dep
->name
= xstrdup (filename
);
180 if (dependency_files
== NULL
)
181 dependency_files
= dep
;
183 dependency_files_tail
->next
= dep
;
184 dependency_files_tail
= dep
;
188 write_dependency_file (void)
191 struct dependency_file
*dep
;
193 out
= fopen (config
.dependency_file
, FOPEN_WT
);
196 einfo (_("%F%P: cannot open dependency file %s: %E\n"),
197 config
.dependency_file
);
200 fprintf (out
, "%s:", output_filename
);
202 for (dep
= dependency_files
; dep
!= NULL
; dep
= dep
->next
)
203 fprintf (out
, " \\\n %s", dep
->name
);
206 for (dep
= dependency_files
; dep
!= NULL
; dep
= dep
->next
)
207 fprintf (out
, "\n%s:\n", dep
->name
);
215 bfd_cache_close_all ();
216 #if BFD_SUPPORTS_PLUGINS
217 plugin_call_cleanup ();
219 if (output_filename
&& delete_output_file_on_failure
)
220 unlink_if_ordinary (output_filename
);
223 /* Hook to notice BFD assertions. */
226 ld_bfd_assert_handler (const char *fmt
, const char *bfdver
,
227 const char *file
, int line
)
229 config
.make_executable
= false;
230 (*default_bfd_assert_handler
) (fmt
, bfdver
, file
, line
);
233 /* Hook the bfd error/warning handler for --fatal-warnings. */
236 ld_bfd_error_handler (const char *fmt
, va_list ap
)
238 if (config
.fatal_warnings
)
239 config
.make_executable
= false;
240 (*default_bfd_error_handler
) (fmt
, ap
);
244 main (int argc
, char **argv
)
247 long start_time
= get_run_time ();
249 #ifdef HAVE_LC_MESSAGES
250 setlocale (LC_MESSAGES
, "");
252 setlocale (LC_CTYPE
, "");
253 bindtextdomain (PACKAGE
, LOCALEDIR
);
254 textdomain (PACKAGE
);
256 program_name
= argv
[0];
257 xmalloc_set_program_name (program_name
);
259 START_PROGRESS (program_name
, 0);
261 expandargv (&argc
, &argv
);
263 if (bfd_init () != BFD_INIT_MAGIC
)
264 einfo (_("%F%P: fatal error: libbfd ABI mismatch\n"));
266 bfd_set_error_program_name (program_name
);
268 /* We want to notice and fail on those nasty BFD assertions which are
269 likely to signal incorrect output being generated but otherwise may
271 default_bfd_assert_handler
= bfd_set_assert_handler (ld_bfd_assert_handler
);
273 /* Also hook the bfd error/warning handler for --fatal-warnings. */
274 default_bfd_error_handler
= bfd_set_error_handler (ld_bfd_error_handler
);
276 xatexit (ld_cleanup
);
278 /* Set up the sysroot directory. */
279 ld_sysroot
= get_sysroot (argc
, argv
);
281 ld_canon_sysroot
= lrealpath (ld_sysroot
);
282 if (ld_canon_sysroot
)
284 ld_canon_sysroot_len
= strlen (ld_canon_sysroot
);
286 /* is_sysrooted_pathname() relies on no trailing dirsep. */
287 if (ld_canon_sysroot_len
> 0
288 && IS_DIR_SEPARATOR (ld_canon_sysroot
[ld_canon_sysroot_len
- 1]))
289 ld_canon_sysroot
[--ld_canon_sysroot_len
] = '\0';
292 ld_canon_sysroot_len
= -1;
294 /* Set the default BFD target based on the configured target. Doing
295 this permits the linker to be configured for a particular target,
296 and linked against a shared BFD library which was configured for
297 a different target. The macro TARGET is defined by Makefile. */
298 if (!bfd_set_default_target (TARGET
))
300 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET
);
311 config
.build_constructors
= true;
312 config
.rpath_separator
= ':';
313 config
.split_by_reloc
= (unsigned) -1;
314 config
.split_by_file
= (bfd_size_type
) -1;
315 config
.make_executable
= true;
316 config
.magic_demand_paged
= true;
317 config
.text_read_only
= true;
318 config
.print_map_discarded
= true;
319 link_info
.disable_target_specific_optimizations
= -1;
321 command_line
.warn_mismatch
= true;
322 command_line
.warn_search_mismatch
= true;
323 command_line
.check_section_addresses
= -1;
325 /* We initialize DEMANGLING based on the environment variable
326 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
327 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
328 environment. Acting the same way here lets us provide the same
329 interface by default. */
330 demangling
= getenv ("COLLECT_NO_DEMANGLE") == NULL
;
332 link_info
.allow_undefined_version
= true;
333 link_info
.keep_memory
= true;
334 link_info
.max_cache_size
= (bfd_size_type
) -1;
335 link_info
.combreloc
= true;
336 link_info
.strip_discarded
= true;
337 link_info
.prohibit_multiple_definition_absolute
= false;
338 link_info
.textrel_check
= DEFAULT_LD_TEXTREL_CHECK
;
339 link_info
.emit_hash
= DEFAULT_EMIT_SYSV_HASH
;
340 link_info
.emit_gnu_hash
= DEFAULT_EMIT_GNU_HASH
;
341 link_info
.callbacks
= &link_callbacks
;
342 link_info
.input_bfds_tail
= &link_info
.input_bfds
;
343 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
344 and _fini symbols. We are compatible. */
345 link_info
.init_function
= "_init";
346 link_info
.fini_function
= "_fini";
347 link_info
.relax_pass
= 1;
348 link_info
.extern_protected_data
= -1;
349 link_info
.dynamic_undefined_weak
= -1;
350 link_info
.indirect_extern_access
= -1;
351 link_info
.pei386_auto_import
= -1;
352 link_info
.spare_dynamic_tags
= 5;
353 link_info
.path_separator
= ':';
354 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
355 link_info
.compress_debug
= COMPRESS_DEBUG_GABI_ZLIB
;
357 #ifdef DEFAULT_NEW_DTAGS
358 link_info
.new_dtags
= DEFAULT_NEW_DTAGS
;
360 link_info
.start_stop_gc
= false;
361 link_info
.start_stop_visibility
= STV_PROTECTED
;
363 ldfile_add_arch ("");
364 emulation
= get_emulation (argc
, argv
);
365 ldemul_choose_mode (emulation
);
366 default_target
= ldemul_choose_target (argc
, argv
);
369 ldemul_before_parse ();
370 lang_has_input_file
= false;
371 parse_args (argc
, argv
);
373 if (config
.hash_table_size
!= 0)
374 bfd_hash_set_default_size (config
.hash_table_size
);
376 #if BFD_SUPPORTS_PLUGINS
377 /* Now all the plugin arguments have been gathered, we can load them. */
378 plugin_load_plugins ();
379 #endif /* BFD_SUPPORTS_PLUGINS */
381 ldemul_set_symbols ();
383 /* If we have not already opened and parsed a linker script,
384 try the default script from command line first. */
385 if (saved_script_handle
== NULL
386 && command_line
.default_script
!= NULL
)
388 ldfile_open_script_file (command_line
.default_script
);
389 parser_input
= input_script
;
393 /* If we have not already opened and parsed a linker script
394 read the emulation's appropriate default script. */
395 if (saved_script_handle
== NULL
)
398 char *s
= ldemul_get_script (&isfile
);
401 ldfile_open_default_command_file (s
);
405 lex_redirect (s
, _("built in linker script"), 1);
407 parser_input
= input_script
;
414 if (saved_script_handle
)
415 info_msg (_("using external linker script:"));
417 info_msg (_("using internal linker script:"));
418 info_msg ("\n==================================================\n");
420 if (saved_script_handle
)
422 static const int ld_bufsz
= 8193;
424 char *buf
= (char *) xmalloc (ld_bufsz
);
426 rewind (saved_script_handle
);
427 while ((n
= fread (buf
, 1, ld_bufsz
- 1, saved_script_handle
)) > 0)
430 info_msg ("%s", buf
);
432 rewind (saved_script_handle
);
439 info_msg (ldemul_get_script (&isfile
));
442 info_msg ("\n==================================================\n");
445 if (command_line
.force_group_allocation
446 || !bfd_link_relocatable (&link_info
))
447 link_info
.resolve_section_groups
= true;
449 link_info
.resolve_section_groups
= false;
451 if (command_line
.print_output_format
)
452 info_msg ("%s\n", lang_get_output_target ());
456 /* If the only command line argument has been -v or --version or --verbose
457 then ignore any input files provided by linker scripts and exit now.
458 We do not want to create an output file when the linker is just invoked
459 to provide version information. */
460 if (argc
== 2 && version_printed
)
463 if (link_info
.inhibit_common_definition
&& !bfd_link_dll (&link_info
))
464 einfo (_("%F%P: --no-define-common may not be used without -shared\n"));
466 if (!lang_has_input_file
)
468 if (version_printed
|| command_line
.print_output_format
)
470 einfo (_("%F%P: no input files\n"));
474 info_msg (_("%P: mode %s\n"), emulation
);
476 ldemul_after_parse ();
478 if (config
.map_filename
)
480 if (strcmp (config
.map_filename
, "-") == 0)
482 config
.map_file
= stdout
;
486 config
.map_file
= fopen (config
.map_filename
, FOPEN_WT
);
487 if (config
.map_file
== (FILE *) NULL
)
489 bfd_set_error (bfd_error_system_call
);
490 einfo (_("%F%P: cannot open map file %s: %E\n"),
491 config
.map_filename
);
494 link_info
.has_map_file
= true;
499 /* Print error messages for any missing symbols, for any warning
500 symbols, and possibly multiple definitions. */
501 if (bfd_link_relocatable (&link_info
))
502 link_info
.output_bfd
->flags
&= ~EXEC_P
;
504 link_info
.output_bfd
->flags
|= EXEC_P
;
506 if ((link_info
.compress_debug
& COMPRESS_DEBUG
))
508 link_info
.output_bfd
->flags
|= BFD_COMPRESS
;
509 if (link_info
.compress_debug
== COMPRESS_DEBUG_GABI_ZLIB
)
510 link_info
.output_bfd
->flags
|= BFD_COMPRESS_GABI
;
515 if (config
.map_file
!= NULL
)
517 if (command_line
.cref
)
518 output_cref (config
.map_file
!= NULL
? config
.map_file
: stdout
);
519 if (nocrossref_list
!= NULL
)
520 check_nocrossrefs ();
521 if (command_line
.print_memory_usage
)
522 lang_print_memory_usage ();
525 struct bfd_link_hash_entry
*h
;
527 h
= bfd_link_hash_lookup (link_info
.hash
, "__image_base__", 0,0,1);
528 fprintf (stderr
, "lookup = %p val %lx\n", h
, h
? h
->u
.def
.value
: 1);
534 if (config
.dependency_file
!= NULL
)
535 write_dependency_file ();
537 /* Even if we're producing relocatable output, some non-fatal errors should
538 be reported in the exit status. (What non-fatal errors, if any, do we
539 want to ignore for relocatable output?) */
540 if (!config
.make_executable
&& !force_make_executable
)
543 einfo (_("%P: link errors found, deleting executable `%s'\n"),
546 /* The file will be removed by ld_cleanup. */
551 if (!bfd_close (link_info
.output_bfd
))
552 einfo (_("%F%P: %pB: final close failed: %E\n"), link_info
.output_bfd
);
554 /* If the --force-exe-suffix is enabled, and we're making an
555 executable file and it doesn't end in .exe, copy it to one
557 if (!bfd_link_relocatable (&link_info
)
558 && command_line
.force_exe_suffix
)
560 int len
= strlen (output_filename
);
563 || (strcasecmp (output_filename
+ len
- 4, ".exe") != 0
564 && strcasecmp (output_filename
+ len
- 4, ".dll") != 0))
568 const int bsize
= 4096;
569 char *buf
= (char *) xmalloc (bsize
);
571 char *dst_name
= (char *) xmalloc (len
+ 5);
573 strcpy (dst_name
, output_filename
);
574 strcat (dst_name
, ".exe");
575 src
= fopen (output_filename
, FOPEN_RB
);
576 dst
= fopen (dst_name
, FOPEN_WB
);
579 einfo (_("%F%P: unable to open for source of copy `%s'\n"),
582 einfo (_("%F%P: unable to open for destination of copy `%s'\n"),
584 while ((l
= fread (buf
, 1, bsize
, src
)) > 0)
586 int done
= fwrite (buf
, 1, l
, dst
);
589 einfo (_("%P: error writing file `%s'\n"), dst_name
);
593 if (fclose (dst
) == EOF
)
594 einfo (_("%P: error closing file `%s'\n"), dst_name
);
601 END_PROGRESS (program_name
);
605 long run_time
= get_run_time () - start_time
;
608 fprintf (stderr
, _("%s: total time in link: %ld.%06ld\n"),
609 program_name
, run_time
/ 1000000, run_time
% 1000000);
613 /* Prevent ld_cleanup from doing anything, after a successful link. */
614 output_filename
= NULL
;
620 /* If the configured sysroot is relocatable, try relocating it based on
621 default prefix FROM. Return the relocated directory if it exists,
622 otherwise return null. */
625 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED
)
627 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
631 path
= make_relative_prefix (program_name
, from
, TARGET_SYSTEM_ROOT
);
634 if (stat (path
, &s
) == 0 && S_ISDIR (s
.st_mode
))
642 /* Return the sysroot directory. Return "" if no sysroot is being used. */
645 get_sysroot (int argc
, char **argv
)
648 const char *path
= NULL
;
650 for (i
= 1; i
< argc
; i
++)
651 if (startswith (argv
[i
], "--sysroot="))
652 path
= argv
[i
] + strlen ("--sysroot=");
655 path
= get_relative_sysroot (BINDIR
);
658 path
= get_relative_sysroot (TOOLBINDIR
);
661 path
= TARGET_SYSTEM_ROOT
;
663 if (IS_DIR_SEPARATOR (*path
) && path
[1] == 0)
669 /* We need to find any explicitly given emulation in order to initialize the
670 state that's needed by the lex&yacc argument parser (parse_args). */
673 get_emulation (int argc
, char **argv
)
678 emulation
= getenv (EMULATION_ENVIRON
);
679 if (emulation
== NULL
)
680 emulation
= DEFAULT_EMULATION
;
682 for (i
= 1; i
< argc
; i
++)
684 if (startswith (argv
[i
], "-m"))
686 if (argv
[i
][2] == '\0')
691 emulation
= argv
[i
+ 1];
695 einfo (_("%F%P: missing argument to -m\n"));
697 else if (strcmp (argv
[i
], "-mips1") == 0
698 || strcmp (argv
[i
], "-mips2") == 0
699 || strcmp (argv
[i
], "-mips3") == 0
700 || strcmp (argv
[i
], "-mips4") == 0
701 || strcmp (argv
[i
], "-mips5") == 0
702 || strcmp (argv
[i
], "-mips32") == 0
703 || strcmp (argv
[i
], "-mips32r2") == 0
704 || strcmp (argv
[i
], "-mips32r3") == 0
705 || strcmp (argv
[i
], "-mips32r5") == 0
706 || strcmp (argv
[i
], "-mips32r6") == 0
707 || strcmp (argv
[i
], "-mips64") == 0
708 || strcmp (argv
[i
], "-mips64r2") == 0
709 || strcmp (argv
[i
], "-mips64r3") == 0
710 || strcmp (argv
[i
], "-mips64r5") == 0
711 || strcmp (argv
[i
], "-mips64r6") == 0)
713 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
714 passed to the linker by some MIPS compilers. They
715 generally tell the linker to use a slightly different
716 library path. Perhaps someday these should be
717 implemented as emulations; until then, we just ignore
718 the arguments and hope that nobody ever creates
719 emulations named ips1, ips2 or ips3. */
721 else if (strcmp (argv
[i
], "-m486") == 0)
723 /* FIXME: The argument -m486 is passed to the linker on
724 some Linux systems. Hope that nobody creates an
725 emulation named 486. */
730 emulation
= &argv
[i
][2];
739 add_ysym (const char *name
)
741 if (link_info
.notice_hash
== NULL
)
743 link_info
.notice_hash
744 = (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
745 if (!bfd_hash_table_init_n (link_info
.notice_hash
,
747 sizeof (struct bfd_hash_entry
),
749 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
752 if (bfd_hash_lookup (link_info
.notice_hash
, name
, true, true) == NULL
)
753 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
757 add_ignoresym (struct bfd_link_info
*info
, const char *name
)
759 if (info
->ignore_hash
== NULL
)
761 info
->ignore_hash
= xmalloc (sizeof (struct bfd_hash_table
));
762 if (!bfd_hash_table_init_n (info
->ignore_hash
,
764 sizeof (struct bfd_hash_entry
),
766 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
769 if (bfd_hash_lookup (info
->ignore_hash
, name
, true, true) == NULL
)
770 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
773 /* Record a symbol to be wrapped, from the --wrap option. */
776 add_wrap (const char *name
)
778 if (link_info
.wrap_hash
== NULL
)
781 = (struct bfd_hash_table
*) xmalloc (sizeof (struct bfd_hash_table
));
782 if (!bfd_hash_table_init_n (link_info
.wrap_hash
,
784 sizeof (struct bfd_hash_entry
),
786 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
789 if (bfd_hash_lookup (link_info
.wrap_hash
, name
, true, true) == NULL
)
790 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
793 /* Handle the -retain-symbols-file option. */
796 add_keepsyms_file (const char *filename
)
803 if (link_info
.strip
== strip_some
)
804 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
806 file
= fopen (filename
, "r");
809 bfd_set_error (bfd_error_system_call
);
810 einfo ("%X%P: %s: %E\n", filename
);
814 link_info
.keep_hash
= (struct bfd_hash_table
*)
815 xmalloc (sizeof (struct bfd_hash_table
));
816 if (!bfd_hash_table_init (link_info
.keep_hash
, bfd_hash_newfunc
,
817 sizeof (struct bfd_hash_entry
)))
818 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
821 buf
= (char *) xmalloc (bufsize
);
833 while (!ISSPACE (c
) && c
!= EOF
)
840 buf
= (char *) xrealloc (buf
, bufsize
);
847 if (bfd_hash_lookup (link_info
.keep_hash
, buf
, true, true) == NULL
)
848 einfo (_("%F%P: bfd_hash_lookup for insertion failed: %E\n"));
852 if (link_info
.strip
!= strip_none
)
853 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
856 link_info
.strip
= strip_some
;
860 /* Callbacks from the BFD linker routines. */
862 /* This is called when BFD has decided to include an archive member in
866 add_archive_element (struct bfd_link_info
*info
,
869 bfd
**subsbfd ATTRIBUTE_UNUSED
)
871 lang_input_statement_type
*input
;
872 lang_input_statement_type
*parent
;
873 lang_input_statement_type orig_input
;
875 input
= (lang_input_statement_type
*)
876 xcalloc (1, sizeof (lang_input_statement_type
));
877 input
->header
.type
= lang_input_statement_enum
;
878 input
->filename
= bfd_get_filename (abfd
);
879 input
->local_sym_name
= bfd_get_filename (abfd
);
880 input
->the_bfd
= abfd
;
882 /* Save the original data for trace files/tries below, as plugins
883 (if enabled) may possibly alter it to point to a replacement
884 BFD, but we still want to output the original BFD filename. */
886 #if BFD_SUPPORTS_PLUGINS
887 if (link_info
.lto_plugin_active
)
889 /* We must offer this archive member to the plugins to claim. */
890 plugin_maybe_claim (input
);
891 if (input
->flags
.claimed
)
893 if (no_more_claiming
)
895 /* Don't claim new IR symbols after all IR symbols have
898 info_msg ("%pI: no new IR symbols to claim\n",
900 input
->flags
.claimed
= 0;
903 input
->flags
.claim_archive
= true;
904 *subsbfd
= input
->the_bfd
;
907 #endif /* BFD_SUPPORTS_PLUGINS */
909 if (link_info
.input_bfds_tail
== &input
->the_bfd
->link
.next
910 || input
->the_bfd
->link
.next
!= NULL
)
912 /* We have already loaded this element, and are attempting to
913 load it again. This can happen when the archive map doesn't
914 match actual symbols defined by the element. */
916 bfd_set_error (bfd_error_malformed_archive
);
920 /* Set the file_chain pointer of archives to the last element loaded
921 from the archive. See ldlang.c:find_rescan_insertion. */
922 parent
= bfd_usrdata (abfd
->my_archive
);
923 if (parent
!= NULL
&& !parent
->flags
.reload
)
924 parent
->next
= input
;
926 ldlang_add_file (input
);
928 if (config
.map_file
!= NULL
)
930 static bool header_printed
;
931 struct bfd_link_hash_entry
*h
;
935 h
= bfd_link_hash_lookup (info
->hash
, name
, false, false, true);
937 && info
->pei386_auto_import
938 && startswith (name
, "__imp_"))
939 h
= bfd_link_hash_lookup (info
->hash
, name
+ 6, false, false, true);
951 case bfd_link_hash_defined
:
952 case bfd_link_hash_defweak
:
953 from
= h
->u
.def
.section
->owner
;
956 case bfd_link_hash_undefined
:
957 case bfd_link_hash_undefweak
:
958 from
= h
->u
.undef
.abfd
;
961 case bfd_link_hash_common
:
962 from
= h
->u
.c
.p
->section
->owner
;
969 minfo (_("Archive member included to satisfy reference by file (symbol)\n\n"));
970 header_printed
= true;
973 if (abfd
->my_archive
== NULL
974 || bfd_is_thin_archive (abfd
->my_archive
))
976 minfo ("%s", bfd_get_filename (abfd
));
977 len
= strlen (bfd_get_filename (abfd
));
981 minfo ("%s(%s)", bfd_get_filename (abfd
->my_archive
),
982 bfd_get_filename (abfd
));
983 len
= (strlen (bfd_get_filename (abfd
->my_archive
))
984 + strlen (bfd_get_filename (abfd
))
1000 minfo ("%pB ", from
);
1002 minfo ("(%pT)\n", h
->root
.string
);
1004 minfo ("(%s)\n", name
);
1009 || (trace_files
&& bfd_is_thin_archive (orig_input
.the_bfd
->my_archive
)))
1010 info_msg ("%pI\n", &orig_input
);
1014 /* This is called when BFD has discovered a symbol which is defined
1018 multiple_definition (struct bfd_link_info
*info
,
1019 struct bfd_link_hash_entry
*h
,
1029 if (info
->allow_multiple_definition
)
1034 case bfd_link_hash_defined
:
1035 osec
= h
->u
.def
.section
;
1036 oval
= h
->u
.def
.value
;
1037 obfd
= h
->u
.def
.section
->owner
;
1039 case bfd_link_hash_indirect
:
1040 osec
= bfd_ind_section_ptr
;
1048 /* Ignore a redefinition of an absolute symbol to the
1049 same value; it's harmless. */
1050 if (h
->type
== bfd_link_hash_defined
1051 && bfd_is_abs_section (osec
)
1052 && bfd_is_abs_section (nsec
)
1056 /* If either section has the output_section field set to
1057 bfd_abs_section_ptr, it means that the section is being
1058 discarded, and this is not really a multiple definition at all.
1059 FIXME: It would be cleaner to somehow ignore symbols defined in
1060 sections which are being discarded. */
1061 if (!info
->prohibit_multiple_definition_absolute
1062 && ((osec
->output_section
!= NULL
1063 && ! bfd_is_abs_section (osec
)
1064 && bfd_is_abs_section (osec
->output_section
))
1065 || (nsec
->output_section
!= NULL
1066 && !bfd_is_abs_section (nsec
)
1067 && bfd_is_abs_section (nsec
->output_section
))))
1070 name
= h
->root
.string
;
1078 if (info
->warn_multiple_definition
)
1079 einfo (_("%P: %C: warning: multiple definition of `%pT'"),
1080 nbfd
, nsec
, nval
, name
);
1082 einfo (_("%X%P: %C: multiple definition of `%pT'"),
1083 nbfd
, nsec
, nval
, name
);
1085 einfo (_("; %D: first defined here"), obfd
, osec
, oval
);
1088 if (RELAXATION_ENABLED_BY_USER
)
1090 einfo (_("%P: disabling relaxation; it will not work with multiple definitions\n"));
1095 /* This is called when there is a definition of a common symbol, or
1096 when a common symbol is found for a symbol that is already defined,
1097 or when two common symbols are found. We only do something if
1098 -warn-common was used. */
1101 multiple_common (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1102 struct bfd_link_hash_entry
*h
,
1104 enum bfd_link_hash_type ntype
,
1109 enum bfd_link_hash_type otype
;
1112 if (!config
.warn_common
)
1115 name
= h
->root
.string
;
1117 if (otype
== bfd_link_hash_common
)
1119 obfd
= h
->u
.c
.p
->section
->owner
;
1120 osize
= h
->u
.c
.size
;
1122 else if (otype
== bfd_link_hash_defined
1123 || otype
== bfd_link_hash_defweak
)
1125 obfd
= h
->u
.def
.section
->owner
;
1130 /* FIXME: It would nice if we could report the BFD which defined
1131 an indirect symbol, but we don't have anywhere to store the
1137 if (ntype
== bfd_link_hash_defined
1138 || ntype
== bfd_link_hash_defweak
1139 || ntype
== bfd_link_hash_indirect
)
1141 ASSERT (otype
== bfd_link_hash_common
);
1143 einfo (_("%P: %pB: warning: definition of `%pT' overriding common"
1147 einfo (_("%P: %pB: warning: definition of `%pT' overriding common\n"),
1150 else if (otype
== bfd_link_hash_defined
1151 || otype
== bfd_link_hash_defweak
1152 || otype
== bfd_link_hash_indirect
)
1154 ASSERT (ntype
== bfd_link_hash_common
);
1156 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition"
1160 einfo (_("%P: %pB: warning: common of `%pT' overridden by definition\n"),
1165 ASSERT (otype
== bfd_link_hash_common
&& ntype
== bfd_link_hash_common
);
1169 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1170 " by larger common from %pB\n"),
1173 einfo (_("%P: %pB: warning: common of `%pT' overridden"
1174 " by larger common\n"),
1177 else if (nsize
> osize
)
1180 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1181 " smaller common from %pB\n"),
1184 einfo (_("%P: %pB: warning: common of `%pT' overriding"
1185 " smaller common\n"),
1191 einfo (_("%P: %pB and %pB: warning: multiple common of `%pT'\n"),
1194 einfo (_("%P: %pB: warning: multiple common of `%pT'\n"),
1200 /* This is called when BFD has discovered a set element. H is the
1201 entry in the linker hash table for the set. SECTION and VALUE
1202 represent a value which should be added to the set. */
1205 add_to_set (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1206 struct bfd_link_hash_entry
*h
,
1207 bfd_reloc_code_real_type reloc
,
1212 if (config
.warn_constructors
)
1213 einfo (_("%P: warning: global constructor %s used\n"),
1216 if (!config
.build_constructors
)
1219 ldctor_add_set_entry (h
, reloc
, NULL
, section
, value
);
1221 if (h
->type
== bfd_link_hash_new
)
1223 h
->type
= bfd_link_hash_undefined
;
1224 h
->u
.undef
.abfd
= abfd
;
1225 /* We don't call bfd_link_add_undef to add this to the list of
1226 undefined symbols because we are going to define it
1231 /* This is called when BFD has discovered a constructor. This is only
1232 called for some object file formats--those which do not handle
1233 constructors in some more clever fashion. This is similar to
1234 adding an element to a set, but less general. */
1237 constructor_callback (struct bfd_link_info
*info
,
1245 struct bfd_link_hash_entry
*h
;
1246 char set_name
[1 + sizeof "__CTOR_LIST__"];
1248 if (config
.warn_constructors
)
1249 einfo (_("%P: warning: global constructor %s used\n"), name
);
1251 if (!config
.build_constructors
)
1254 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1255 useful error message. */
1256 if (bfd_reloc_type_lookup (info
->output_bfd
, BFD_RELOC_CTOR
) == NULL
1257 && (bfd_link_relocatable (info
)
1258 || bfd_reloc_type_lookup (abfd
, BFD_RELOC_CTOR
) == NULL
))
1259 einfo (_("%F%P: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1262 if (bfd_get_symbol_leading_char (abfd
) != '\0')
1263 *s
++ = bfd_get_symbol_leading_char (abfd
);
1265 strcpy (s
, "__CTOR_LIST__");
1267 strcpy (s
, "__DTOR_LIST__");
1269 h
= bfd_link_hash_lookup (info
->hash
, set_name
, true, true, true);
1270 if (h
== (struct bfd_link_hash_entry
*) NULL
)
1271 einfo (_("%F%P: bfd_link_hash_lookup failed: %E\n"));
1272 if (h
->type
== bfd_link_hash_new
)
1274 h
->type
= bfd_link_hash_undefined
;
1275 h
->u
.undef
.abfd
= abfd
;
1276 /* We don't call bfd_link_add_undef to add this to the list of
1277 undefined symbols because we are going to define it
1281 ldctor_add_set_entry (h
, BFD_RELOC_CTOR
, name
, section
, value
);
1284 /* A structure used by warning_callback to pass information through
1285 bfd_map_over_sections. */
1287 struct warning_callback_info
1290 const char *warning
;
1295 /* Look through the relocs to see if we can find a plausible address
1296 for SYMBOL in ABFD. Return TRUE if found. Otherwise return FALSE. */
1299 symbol_warning (const char *warning
, const char *symbol
, bfd
*abfd
)
1301 struct warning_callback_info cinfo
;
1303 if (!bfd_generic_link_read_symbols (abfd
))
1304 einfo (_("%F%P: %pB: could not read symbols: %E\n"), abfd
);
1306 cinfo
.found
= false;
1307 cinfo
.warning
= warning
;
1308 cinfo
.symbol
= symbol
;
1309 cinfo
.asymbols
= bfd_get_outsymbols (abfd
);
1310 bfd_map_over_sections (abfd
, warning_find_reloc
, &cinfo
);
1314 /* This is called when there is a reference to a warning symbol. */
1317 warning_callback (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1318 const char *warning
,
1324 /* This is a hack to support warn_multiple_gp. FIXME: This should
1325 have a cleaner interface, but what? */
1326 if (!config
.warn_multiple_gp
1327 && strcmp (warning
, "using multiple gp values") == 0)
1330 if (section
!= NULL
)
1331 einfo ("%P: %C: %s%s\n", abfd
, section
, address
, _("warning: "), warning
);
1332 else if (abfd
== NULL
)
1333 einfo ("%P: %s%s\n", _("warning: "), warning
);
1334 else if (symbol
== NULL
)
1335 einfo ("%P: %pB: %s%s\n", abfd
, _("warning: "), warning
);
1336 else if (!symbol_warning (warning
, symbol
, abfd
))
1339 /* Search all input files for a reference to SYMBOL. */
1340 for (b
= info
->input_bfds
; b
; b
= b
->link
.next
)
1341 if (b
!= abfd
&& symbol_warning (warning
, symbol
, b
))
1343 einfo ("%P: %pB: %s%s\n", abfd
, _("warning: "), warning
);
1347 /* This is called by warning_callback for each section. It checks the
1348 relocs of the section to see if it can find a reference to the
1349 symbol which triggered the warning. If it can, it uses the reloc
1350 to give an error message with a file and line number. */
1353 warning_find_reloc (bfd
*abfd
, asection
*sec
, void *iarg
)
1355 struct warning_callback_info
*info
= (struct warning_callback_info
*) iarg
;
1359 arelent
**p
, **pend
;
1364 relsize
= bfd_get_reloc_upper_bound (abfd
, sec
);
1366 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd
);
1370 relpp
= (arelent
**) xmalloc (relsize
);
1371 relcount
= bfd_canonicalize_reloc (abfd
, sec
, relpp
, info
->asymbols
);
1373 einfo (_("%F%P: %pB: could not read relocs: %E\n"), abfd
);
1376 pend
= p
+ relcount
;
1377 for (; p
< pend
&& *p
!= NULL
; p
++)
1381 if (q
->sym_ptr_ptr
!= NULL
1382 && *q
->sym_ptr_ptr
!= NULL
1383 && strcmp (bfd_asymbol_name (*q
->sym_ptr_ptr
), info
->symbol
) == 0)
1385 /* We found a reloc for the symbol we are looking for. */
1386 einfo ("%P: %C: %s%s\n", abfd
, sec
, q
->address
, _("warning: "),
1396 #if SUPPORT_ERROR_HANDLING_SCRIPT
1397 char * error_handling_script
= NULL
;
1400 /* This is called when an undefined symbol is found. */
1403 undefined_symbol (struct bfd_link_info
*info
,
1410 static char *error_name
;
1411 static unsigned int error_count
;
1413 #define MAX_ERRORS_IN_A_ROW 5
1415 if (info
->ignore_hash
!= NULL
1416 && bfd_hash_lookup (info
->ignore_hash
, name
, false, false) != NULL
)
1419 if (config
.warn_once
)
1421 /* Only warn once about a particular undefined symbol. */
1422 add_ignoresym (info
, name
);
1425 /* We never print more than a reasonable number of errors in a row
1426 for a single symbol. */
1427 if (error_name
!= NULL
1428 && strcmp (name
, error_name
) == 0)
1434 error_name
= xstrdup (name
);
1437 #if SUPPORT_ERROR_HANDLING_SCRIPT
1438 if (error_handling_script
!= NULL
1439 && error_count
< MAX_ERRORS_IN_A_ROW
)
1445 argv
[0] = error_handling_script
;
1446 argv
[1] = "undefined-symbol";
1447 argv
[2] = (char *) name
;
1451 einfo (_("%P: About to run error handling script '%s' with arguments: '%s' '%s'\n"),
1452 argv
[0], argv
[1], argv
[2]);
1454 res
= pex_one (PEX_SEARCH
, error_handling_script
, argv
,
1455 N_("error handling script"),
1456 NULL
/* Send stdout to random, temp file. */,
1457 NULL
/* Write to stderr. */,
1461 einfo (_("%P: Failed to run error handling script '%s', reason: "),
1462 error_handling_script
);
1463 /* FIXME: We assume here that errrno == err. */
1466 /* We ignore the return status of the script and
1467 carry on to issue the normal error message. */
1469 #endif /* SUPPORT_ERROR_HANDLING_SCRIPT */
1471 if (section
!= NULL
)
1473 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1476 einfo (_("%X%P: %C: undefined reference to `%pT'\n"),
1477 abfd
, section
, address
, name
);
1479 einfo (_("%P: %C: warning: undefined reference to `%pT'\n"),
1480 abfd
, section
, address
, name
);
1482 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1485 einfo (_("%X%P: %D: more undefined references to `%pT' follow\n"),
1486 abfd
, section
, address
, name
);
1488 einfo (_("%P: %D: warning: more undefined references to `%pT' follow\n"),
1489 abfd
, section
, address
, name
);
1496 if (error_count
< MAX_ERRORS_IN_A_ROW
)
1499 einfo (_("%X%P: %pB: undefined reference to `%pT'\n"),
1502 einfo (_("%P: %pB: warning: undefined reference to `%pT'\n"),
1505 else if (error_count
== MAX_ERRORS_IN_A_ROW
)
1508 einfo (_("%X%P: %pB: more undefined references to `%pT' follow\n"),
1511 einfo (_("%P: %pB: warning: more undefined references to `%pT' follow\n"),
1519 /* Counter to limit the number of relocation overflow error messages
1520 to print. Errors are printed as it is decremented. When it's
1521 called and the counter is zero, a final message is printed
1522 indicating more relocations were omitted. When it gets to -1, no
1523 such errors are printed. If it's initially set to a value less
1524 than -1, all such errors will be printed (--verbose does this). */
1526 int overflow_cutoff_limit
= 10;
1528 /* This is called when a reloc overflows. */
1531 reloc_overflow (struct bfd_link_info
*info
,
1532 struct bfd_link_hash_entry
*entry
,
1534 const char *reloc_name
,
1540 if (overflow_cutoff_limit
== -1)
1543 einfo ("%X%H:", abfd
, section
, address
);
1545 if (overflow_cutoff_limit
>= 0
1546 && overflow_cutoff_limit
-- == 0)
1548 einfo (_(" additional relocation overflows omitted from the output\n"));
1554 while (entry
->type
== bfd_link_hash_indirect
1555 || entry
->type
== bfd_link_hash_warning
)
1556 entry
= entry
->u
.i
.link
;
1557 switch (entry
->type
)
1559 case bfd_link_hash_undefined
:
1560 case bfd_link_hash_undefweak
:
1561 einfo (_(" relocation truncated to fit: "
1562 "%s against undefined symbol `%pT'"),
1563 reloc_name
, entry
->root
.string
);
1565 case bfd_link_hash_defined
:
1566 case bfd_link_hash_defweak
:
1567 einfo (_(" relocation truncated to fit: "
1568 "%s against symbol `%pT' defined in %pA section in %pB"),
1569 reloc_name
, entry
->root
.string
,
1570 entry
->u
.def
.section
,
1571 entry
->u
.def
.section
== bfd_abs_section_ptr
1572 ? info
->output_bfd
: entry
->u
.def
.section
->owner
);
1580 einfo (_(" relocation truncated to fit: %s against `%pT'"),
1583 einfo ("+%v", addend
);
1587 /* This is called when a dangerous relocation is made. */
1590 reloc_dangerous (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1591 const char *message
,
1596 einfo (_("%X%H: dangerous relocation: %s\n"),
1597 abfd
, section
, address
, message
);
1600 /* This is called when a reloc is being generated attached to a symbol
1601 that is not being output. */
1604 unattached_reloc (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1610 einfo (_("%X%H: reloc refers to symbol `%pT' which is not being output\n"),
1611 abfd
, section
, address
, name
);
1614 /* This is called if link_info.notice_all is set, or when a symbol in
1615 link_info.notice_hash is found. Symbols are put in notice_hash
1616 using the -y option, while notice_all is set if the --cref option
1617 has been supplied, or if there are any NOCROSSREFS sections in the
1618 linker script; and if plugins are active, since they need to monitor
1619 all references from non-IR files. */
1622 notice (struct bfd_link_info
*info
,
1623 struct bfd_link_hash_entry
*h
,
1624 struct bfd_link_hash_entry
*inh ATTRIBUTE_UNUSED
,
1628 flagword flags ATTRIBUTE_UNUSED
)
1634 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1635 return handle_asneeded_cref (abfd
, (enum notice_asneeded_action
) value
);
1639 name
= h
->root
.string
;
1640 if (info
->notice_hash
!= NULL
1641 && bfd_hash_lookup (info
->notice_hash
, name
, false, false) != NULL
)
1643 if (bfd_is_und_section (section
))
1644 einfo (_("%P: %pB: reference to %s\n"), abfd
, name
);
1646 einfo (_("%P: %pB: definition of %s\n"), abfd
, name
);
1649 if (command_line
.cref
|| nocrossref_list
!= NULL
)
1650 add_cref (name
, abfd
, section
, value
);