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[binutils.git] / ld / ldmain.c
blob08679ecbb50b27a4e4fae662590325c567521985
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, 2007, 2008, 2009
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of the GNU Binutils.
9 This program 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 3 of the License, or
12 (at your option) any later version.
14 This program 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 this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
24 #include "sysdep.h"
25 #include "bfd.h"
26 #include "safe-ctype.h"
27 #include "libiberty.h"
28 #include "progress.h"
29 #include "bfdlink.h"
30 #include "filenames.h"
32 #include "ld.h"
33 #include "ldmain.h"
34 #include "ldmisc.h"
35 #include "ldwrite.h"
36 #include "ldexp.h"
37 #include "ldlang.h"
38 #include <ldgram.h>
39 #include "ldlex.h"
40 #include "ldfile.h"
41 #include "ldemul.h"
42 #include "ldctor.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)
47 #endif
49 #include <string.h>
51 #ifdef HAVE_SBRK
52 #if !HAVE_DECL_SBRK
53 extern void *sbrk ();
54 #endif
55 #endif
57 #ifndef TARGET_SYSTEM_ROOT
58 #define TARGET_SYSTEM_ROOT ""
59 #endif
61 /* EXPORTS */
63 FILE *saved_script_handle = NULL;
64 FILE *previous_script_handle = NULL;
65 bfd_boolean force_make_executable = FALSE;
67 char *default_target;
68 const char *output_filename = "a.out";
70 /* Name this program was invoked by. */
71 char *program_name;
73 /* The prefix for system library directories. */
74 const char *ld_sysroot;
76 /* The canonical representation of ld_sysroot. */
77 char * ld_canon_sysroot;
78 int ld_canon_sysroot_len;
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 /* True means only create DT_NEEDED entries for dynamic libraries
97 if they actually satisfy some reference in a regular object. */
98 bfd_boolean add_DT_NEEDED_for_regular;
100 /* True means create DT_NEEDED entries for dynamic libraries that
101 are DT_NEEDED by dynamic libraries specifically mentioned on
102 the command line. */
103 bfd_boolean add_DT_NEEDED_for_dynamic = TRUE;
105 /* TRUE if we should demangle symbol names. */
106 bfd_boolean demangling;
108 args_type command_line;
110 ld_config_type config;
112 sort_type sort_section;
114 static const char *get_sysroot
115 (int, char **);
116 static char *get_emulation
117 (int, char **);
118 static bfd_boolean add_archive_element
119 (struct bfd_link_info *, bfd *, const char *);
120 static bfd_boolean multiple_definition
121 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
122 bfd *, asection *, bfd_vma);
123 static bfd_boolean multiple_common
124 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
125 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
126 static bfd_boolean add_to_set
127 (struct bfd_link_info *, struct bfd_link_hash_entry *,
128 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
129 static bfd_boolean constructor_callback
130 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
131 asection *, bfd_vma);
132 static bfd_boolean warning_callback
133 (struct bfd_link_info *, const char *, const char *, bfd *,
134 asection *, bfd_vma);
135 static void warning_find_reloc
136 (bfd *, asection *, void *);
137 static bfd_boolean undefined_symbol
138 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
139 bfd_boolean);
140 static bfd_boolean reloc_overflow
141 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
142 const char *, bfd_vma, bfd *, asection *, bfd_vma);
143 static bfd_boolean reloc_dangerous
144 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
145 static bfd_boolean unattached_reloc
146 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
147 static bfd_boolean notice
148 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
150 static struct bfd_link_callbacks link_callbacks =
152 add_archive_element,
153 multiple_definition,
154 multiple_common,
155 add_to_set,
156 constructor_callback,
157 warning_callback,
158 undefined_symbol,
159 reloc_overflow,
160 reloc_dangerous,
161 unattached_reloc,
162 notice,
163 einfo,
164 info_msg,
165 minfo,
166 ldlang_override_segment_assignment
169 struct bfd_link_info link_info;
171 static void
172 remove_output (void)
174 if (output_filename)
176 if (link_info.output_bfd)
177 bfd_cache_close (link_info.output_bfd);
178 if (delete_output_file_on_failure)
179 unlink_if_ordinary (output_filename);
184 main (int argc, char **argv)
186 char *emulation;
187 long start_time = get_run_time ();
189 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
190 setlocale (LC_MESSAGES, "");
191 #endif
192 #if defined (HAVE_SETLOCALE)
193 setlocale (LC_CTYPE, "");
194 #endif
195 bindtextdomain (PACKAGE, LOCALEDIR);
196 textdomain (PACKAGE);
198 program_name = argv[0];
199 xmalloc_set_program_name (program_name);
201 START_PROGRESS (program_name, 0);
203 expandargv (&argc, &argv);
205 bfd_init ();
207 bfd_set_error_program_name (program_name);
209 xatexit (remove_output);
211 /* Set up the sysroot directory. */
212 ld_sysroot = get_sysroot (argc, argv);
213 if (*ld_sysroot)
215 if (*TARGET_SYSTEM_ROOT == 0)
217 einfo ("%P%F: this linker was not configured to use sysroots\n");
218 ld_sysroot = "";
220 else
221 ld_canon_sysroot = lrealpath (ld_sysroot);
223 if (ld_canon_sysroot)
224 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
225 else
226 ld_canon_sysroot_len = -1;
228 /* Set the default BFD target based on the configured target. Doing
229 this permits the linker to be configured for a particular target,
230 and linked against a shared BFD library which was configured for
231 a different target. The macro TARGET is defined by Makefile. */
232 if (! bfd_set_default_target (TARGET))
234 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
235 xexit (1);
238 #if YYDEBUG
240 extern int yydebug;
241 yydebug = 1;
243 #endif
245 config.build_constructors = TRUE;
246 config.rpath_separator = ':';
247 config.split_by_reloc = (unsigned) -1;
248 config.split_by_file = (bfd_size_type) -1;
249 config.make_executable = TRUE;
250 config.magic_demand_paged = TRUE;
251 config.text_read_only = TRUE;
253 command_line.warn_mismatch = TRUE;
254 command_line.warn_search_mismatch = TRUE;
255 command_line.check_section_addresses = -1;
256 command_line.disable_target_specific_optimizations = -1;
258 /* We initialize DEMANGLING based on the environment variable
259 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
260 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
261 environment. Acting the same way here lets us provide the same
262 interface by default. */
263 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
265 link_info.allow_undefined_version = TRUE;
266 link_info.keep_memory = TRUE;
267 link_info.combreloc = TRUE;
268 link_info.strip_discarded = TRUE;
269 link_info.emit_hash = TRUE;
270 link_info.callbacks = &link_callbacks;
271 link_info.input_bfds_tail = &link_info.input_bfds;
272 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
273 and _fini symbols. We are compatible. */
274 link_info.init_function = "_init";
275 link_info.fini_function = "_fini";
276 link_info.relax_pass = 1;
277 link_info.pei386_auto_import = -1;
278 link_info.spare_dynamic_tags = 5;
279 link_info.path_separator = ':';
281 ldfile_add_arch ("");
282 emulation = get_emulation (argc, argv);
283 ldemul_choose_mode (emulation);
284 default_target = ldemul_choose_target (argc, argv);
285 config.maxpagesize = bfd_emul_get_maxpagesize (default_target);
286 config.commonpagesize = bfd_emul_get_commonpagesize (default_target);
287 lang_init ();
288 ldemul_before_parse ();
289 lang_has_input_file = FALSE;
290 parse_args (argc, argv);
292 if (config.hash_table_size != 0)
293 bfd_hash_set_default_size (config.hash_table_size);
295 ldemul_set_symbols ();
297 if (link_info.relocatable)
299 if (command_line.check_section_addresses < 0)
300 command_line.check_section_addresses = 0;
301 if (link_info.shared)
302 einfo (_("%P%F: -r and -shared may not be used together\n"));
305 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
306 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
307 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
308 for shared libraries. -Bsymbolic overrides all others and vice
309 versa. */
310 switch (command_line.symbolic)
312 case symbolic_unset:
313 break;
314 case symbolic:
315 /* -Bsymbolic is for shared library only. */
316 if (link_info.shared)
318 link_info.symbolic = TRUE;
319 /* Should we free the unused memory? */
320 link_info.dynamic_list = NULL;
321 command_line.dynamic_list = dynamic_list_unset;
323 break;
324 case symbolic_functions:
325 /* -Bsymbolic-functions is for shared library only. */
326 if (link_info.shared)
327 command_line.dynamic_list = dynamic_list_data;
328 break;
331 switch (command_line.dynamic_list)
333 case dynamic_list_unset:
334 break;
335 case dynamic_list_data:
336 link_info.dynamic_data = TRUE;
337 case dynamic_list:
338 link_info.dynamic = TRUE;
339 break;
342 if (! link_info.shared)
344 if (command_line.filter_shlib)
345 einfo (_("%P%F: -F may not be used without -shared\n"));
346 if (command_line.auxiliary_filters)
347 einfo (_("%P%F: -f may not be used without -shared\n"));
350 if (! link_info.shared || link_info.pie)
351 link_info.executable = TRUE;
353 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
354 don't see how else this can be handled, since in this case we
355 must preserve all externally visible symbols. */
356 if (link_info.relocatable && link_info.strip == strip_all)
358 link_info.strip = strip_debugger;
359 if (link_info.discard == discard_sec_merge)
360 link_info.discard = discard_all;
363 /* If we have not already opened and parsed a linker script,
364 try the default script from command line first. */
365 if (saved_script_handle == NULL
366 && command_line.default_script != NULL)
368 ldfile_open_command_file (command_line.default_script);
369 parser_input = input_script;
370 yyparse ();
373 /* If we have not already opened and parsed a linker script
374 read the emulation's appropriate default script. */
375 if (saved_script_handle == NULL)
377 int isfile;
378 char *s = ldemul_get_script (&isfile);
380 if (isfile)
381 ldfile_open_default_command_file (s);
382 else
384 lex_string = s;
385 lex_redirect (s);
387 parser_input = input_script;
388 yyparse ();
389 lex_string = NULL;
392 if (trace_file_tries)
394 if (saved_script_handle)
395 info_msg (_("using external linker script:"));
396 else
397 info_msg (_("using internal linker script:"));
398 info_msg ("\n==================================================\n");
400 if (saved_script_handle)
402 static const int ld_bufsz = 8193;
403 size_t n;
404 char *buf = (char *) xmalloc (ld_bufsz);
406 rewind (saved_script_handle);
407 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
409 buf[n] = 0;
410 info_msg (buf);
412 rewind (saved_script_handle);
413 free (buf);
415 else
417 int isfile;
419 info_msg (ldemul_get_script (&isfile));
422 info_msg ("\n==================================================\n");
425 lang_final ();
427 if (!lang_has_input_file)
429 if (version_printed)
430 xexit (0);
431 einfo (_("%P%F: no input files\n"));
434 if (trace_files)
435 info_msg (_("%P: mode %s\n"), emulation);
437 ldemul_after_parse ();
439 if (config.map_filename)
441 if (strcmp (config.map_filename, "-") == 0)
443 config.map_file = stdout;
445 else
447 config.map_file = fopen (config.map_filename, FOPEN_WT);
448 if (config.map_file == (FILE *) NULL)
450 bfd_set_error (bfd_error_system_call);
451 einfo (_("%P%F: cannot open map file %s: %E\n"),
452 config.map_filename);
457 lang_process ();
459 /* Print error messages for any missing symbols, for any warning
460 symbols, and possibly multiple definitions. */
461 if (link_info.relocatable)
462 link_info.output_bfd->flags &= ~EXEC_P;
463 else
464 link_info.output_bfd->flags |= EXEC_P;
466 ldwrite ();
468 if (config.map_file != NULL)
469 lang_map ();
470 if (command_line.cref)
471 output_cref (config.map_file != NULL ? config.map_file : stdout);
472 if (nocrossref_list != NULL)
473 check_nocrossrefs ();
475 lang_finish ();
477 /* Even if we're producing relocatable output, some non-fatal errors should
478 be reported in the exit status. (What non-fatal errors, if any, do we
479 want to ignore for relocatable output?) */
480 if (!config.make_executable && !force_make_executable)
482 if (trace_files)
483 einfo (_("%P: link errors found, deleting executable `%s'\n"),
484 output_filename);
486 /* The file will be removed by remove_output. */
487 xexit (1);
489 else
491 if (! bfd_close (link_info.output_bfd))
492 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
494 /* If the --force-exe-suffix is enabled, and we're making an
495 executable file and it doesn't end in .exe, copy it to one
496 which does. */
497 if (! link_info.relocatable && command_line.force_exe_suffix)
499 int len = strlen (output_filename);
501 if (len < 4
502 || (strcasecmp (output_filename + len - 4, ".exe") != 0
503 && strcasecmp (output_filename + len - 4, ".dll") != 0))
505 FILE *src;
506 FILE *dst;
507 const int bsize = 4096;
508 char *buf = (char *) xmalloc (bsize);
509 int l;
510 char *dst_name = (char *) xmalloc (len + 5);
512 strcpy (dst_name, output_filename);
513 strcat (dst_name, ".exe");
514 src = fopen (output_filename, FOPEN_RB);
515 dst = fopen (dst_name, FOPEN_WB);
517 if (!src)
518 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
519 output_filename);
520 if (!dst)
521 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
522 dst_name);
523 while ((l = fread (buf, 1, bsize, src)) > 0)
525 int done = fwrite (buf, 1, l, dst);
527 if (done != l)
528 einfo (_("%P: Error writing file `%s'\n"), dst_name);
531 fclose (src);
532 if (fclose (dst) == EOF)
533 einfo (_("%P: Error closing file `%s'\n"), dst_name);
534 free (dst_name);
535 free (buf);
540 END_PROGRESS (program_name);
542 if (config.stats)
544 #ifdef HAVE_SBRK
545 char *lim = (char *) sbrk (0);
546 #endif
547 long run_time = get_run_time () - start_time;
549 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
550 program_name, run_time / 1000000, run_time % 1000000);
551 #ifdef HAVE_SBRK
552 fprintf (stderr, _("%s: data size %ld\n"), program_name,
553 (long) (lim - (char *) &environ));
554 #endif
557 /* Prevent remove_output from doing anything, after a successful link. */
558 output_filename = NULL;
560 xexit (0);
561 return 0;
564 /* If the configured sysroot is relocatable, try relocating it based on
565 default prefix FROM. Return the relocated directory if it exists,
566 otherwise return null. */
568 static char *
569 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
571 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
572 char *path;
573 struct stat s;
575 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
576 if (path)
578 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
579 return path;
580 free (path);
582 #endif
583 return 0;
586 /* Return the sysroot directory. Return "" if no sysroot is being used. */
588 static const char *
589 get_sysroot (int argc, char **argv)
591 int i;
592 const char *path;
594 for (i = 1; i < argc; i++)
595 if (CONST_STRNEQ (argv[i], "--sysroot="))
596 return argv[i] + strlen ("--sysroot=");
598 path = get_relative_sysroot (BINDIR);
599 if (path)
600 return path;
602 path = get_relative_sysroot (TOOLBINDIR);
603 if (path)
604 return path;
606 return TARGET_SYSTEM_ROOT;
609 /* We need to find any explicitly given emulation in order to initialize the
610 state that's needed by the lex&yacc argument parser (parse_args). */
612 static char *
613 get_emulation (int argc, char **argv)
615 char *emulation;
616 int i;
618 emulation = getenv (EMULATION_ENVIRON);
619 if (emulation == NULL)
620 emulation = DEFAULT_EMULATION;
622 for (i = 1; i < argc; i++)
624 if (CONST_STRNEQ (argv[i], "-m"))
626 if (argv[i][2] == '\0')
628 /* -m EMUL */
629 if (i < argc - 1)
631 emulation = argv[i + 1];
632 i++;
634 else
635 einfo (_("%P%F: missing argument to -m\n"));
637 else if (strcmp (argv[i], "-mips1") == 0
638 || strcmp (argv[i], "-mips2") == 0
639 || strcmp (argv[i], "-mips3") == 0
640 || strcmp (argv[i], "-mips4") == 0
641 || strcmp (argv[i], "-mips5") == 0
642 || strcmp (argv[i], "-mips32") == 0
643 || strcmp (argv[i], "-mips32r2") == 0
644 || strcmp (argv[i], "-mips64") == 0
645 || strcmp (argv[i], "-mips64r2") == 0)
647 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
648 passed to the linker by some MIPS compilers. They
649 generally tell the linker to use a slightly different
650 library path. Perhaps someday these should be
651 implemented as emulations; until then, we just ignore
652 the arguments and hope that nobody ever creates
653 emulations named ips1, ips2 or ips3. */
655 else if (strcmp (argv[i], "-m486") == 0)
657 /* FIXME: The argument -m486 is passed to the linker on
658 some Linux systems. Hope that nobody creates an
659 emulation named 486. */
661 else
663 /* -mEMUL */
664 emulation = &argv[i][2];
669 return emulation;
672 void
673 add_ysym (const char *name)
675 if (link_info.notice_hash == NULL)
677 link_info.notice_hash =
678 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
679 if (!bfd_hash_table_init_n (link_info.notice_hash,
680 bfd_hash_newfunc,
681 sizeof (struct bfd_hash_entry),
682 61))
683 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
686 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
687 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
690 /* Record a symbol to be wrapped, from the --wrap option. */
692 void
693 add_wrap (const char *name)
695 if (link_info.wrap_hash == NULL)
697 link_info.wrap_hash =
698 (struct bfd_hash_table *) xmalloc (sizeof (struct bfd_hash_table));
699 if (!bfd_hash_table_init_n (link_info.wrap_hash,
700 bfd_hash_newfunc,
701 sizeof (struct bfd_hash_entry),
702 61))
703 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
706 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
707 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
710 /* Handle the -retain-symbols-file option. */
712 void
713 add_keepsyms_file (const char *filename)
715 FILE *file;
716 char *buf;
717 size_t bufsize;
718 int c;
720 if (link_info.strip == strip_some)
721 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
723 file = fopen (filename, "r");
724 if (file == NULL)
726 bfd_set_error (bfd_error_system_call);
727 einfo ("%X%P: %s: %E\n", filename);
728 return;
731 link_info.keep_hash = (struct bfd_hash_table *)
732 xmalloc (sizeof (struct bfd_hash_table));
733 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
734 sizeof (struct bfd_hash_entry)))
735 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
737 bufsize = 100;
738 buf = (char *) xmalloc (bufsize);
740 c = getc (file);
741 while (c != EOF)
743 while (ISSPACE (c))
744 c = getc (file);
746 if (c != EOF)
748 size_t len = 0;
750 while (! ISSPACE (c) && c != EOF)
752 buf[len] = c;
753 ++len;
754 if (len >= bufsize)
756 bufsize *= 2;
757 buf = (char *) xrealloc (buf, bufsize);
759 c = getc (file);
762 buf[len] = '\0';
764 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
765 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
769 if (link_info.strip != strip_none)
770 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
772 free (buf);
773 link_info.strip = strip_some;
776 /* Callbacks from the BFD linker routines. */
778 /* This is called when BFD has decided to include an archive member in
779 a link. */
781 static bfd_boolean
782 add_archive_element (struct bfd_link_info *info,
783 bfd *abfd,
784 const char *name)
786 lang_input_statement_type *input;
788 input = (lang_input_statement_type *)
789 xcalloc (1, sizeof (lang_input_statement_type));
790 input->filename = abfd->filename;
791 input->local_sym_name = abfd->filename;
792 input->the_bfd = abfd;
794 ldlang_add_file (input);
796 if (config.map_file != NULL)
798 static bfd_boolean header_printed;
799 struct bfd_link_hash_entry *h;
800 bfd *from;
801 int len;
803 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
805 if (h == NULL)
806 from = NULL;
807 else
809 switch (h->type)
811 default:
812 from = NULL;
813 break;
815 case bfd_link_hash_defined:
816 case bfd_link_hash_defweak:
817 from = h->u.def.section->owner;
818 break;
820 case bfd_link_hash_undefined:
821 case bfd_link_hash_undefweak:
822 from = h->u.undef.abfd;
823 break;
825 case bfd_link_hash_common:
826 from = h->u.c.p->section->owner;
827 break;
831 if (! header_printed)
833 char buf[100];
835 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
836 minfo ("%s", buf);
837 header_printed = TRUE;
840 if (bfd_my_archive (abfd) == NULL)
842 minfo ("%s", bfd_get_filename (abfd));
843 len = strlen (bfd_get_filename (abfd));
845 else
847 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
848 bfd_get_filename (abfd));
849 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
850 + strlen (bfd_get_filename (abfd))
851 + 2);
854 if (len >= 29)
856 print_nl ();
857 len = 0;
859 while (len < 30)
861 print_space ();
862 ++len;
865 if (from != NULL)
866 minfo ("%B ", from);
867 if (h != NULL)
868 minfo ("(%T)\n", h->root.string);
869 else
870 minfo ("(%s)\n", name);
873 if (trace_files || trace_file_tries)
874 info_msg ("%I\n", input);
876 return TRUE;
879 /* This is called when BFD has discovered a symbol which is defined
880 multiple times. */
882 static bfd_boolean
883 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
884 const char *name,
885 bfd *obfd,
886 asection *osec,
887 bfd_vma oval,
888 bfd *nbfd,
889 asection *nsec,
890 bfd_vma nval)
892 /* If either section has the output_section field set to
893 bfd_abs_section_ptr, it means that the section is being
894 discarded, and this is not really a multiple definition at all.
895 FIXME: It would be cleaner to somehow ignore symbols defined in
896 sections which are being discarded. */
897 if ((osec->output_section != NULL
898 && ! bfd_is_abs_section (osec)
899 && bfd_is_abs_section (osec->output_section))
900 || (nsec->output_section != NULL
901 && ! bfd_is_abs_section (nsec)
902 && bfd_is_abs_section (nsec->output_section)))
903 return TRUE;
905 einfo (_("%X%C: multiple definition of `%T'\n"),
906 nbfd, nsec, nval, name);
907 if (obfd != NULL)
908 einfo (_("%D: first defined here\n"), obfd, osec, oval);
910 if (RELAXATION_ENABLED)
912 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
913 command_line.disable_target_specific_optimizations = -1;
916 return TRUE;
919 /* This is called when there is a definition of a common symbol, or
920 when a common symbol is found for a symbol that is already defined,
921 or when two common symbols are found. We only do something if
922 -warn-common was used. */
924 static bfd_boolean
925 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
926 const char *name,
927 bfd *obfd,
928 enum bfd_link_hash_type otype,
929 bfd_vma osize,
930 bfd *nbfd,
931 enum bfd_link_hash_type ntype,
932 bfd_vma nsize)
934 if (! config.warn_common)
935 return TRUE;
937 if (ntype == bfd_link_hash_defined
938 || ntype == bfd_link_hash_defweak
939 || ntype == bfd_link_hash_indirect)
941 ASSERT (otype == bfd_link_hash_common);
942 einfo (_("%B: warning: definition of `%T' overriding common\n"),
943 nbfd, name);
944 if (obfd != NULL)
945 einfo (_("%B: warning: common is here\n"), obfd);
947 else if (otype == bfd_link_hash_defined
948 || otype == bfd_link_hash_defweak
949 || otype == bfd_link_hash_indirect)
951 ASSERT (ntype == bfd_link_hash_common);
952 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
953 nbfd, name);
954 if (obfd != NULL)
955 einfo (_("%B: warning: defined here\n"), obfd);
957 else
959 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
960 if (osize > nsize)
962 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
963 nbfd, name);
964 if (obfd != NULL)
965 einfo (_("%B: warning: larger common is here\n"), obfd);
967 else if (nsize > osize)
969 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
970 nbfd, name);
971 if (obfd != NULL)
972 einfo (_("%B: warning: smaller common is here\n"), obfd);
974 else
976 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
977 if (obfd != NULL)
978 einfo (_("%B: warning: previous common is here\n"), obfd);
982 return TRUE;
985 /* This is called when BFD has discovered a set element. H is the
986 entry in the linker hash table for the set. SECTION and VALUE
987 represent a value which should be added to the set. */
989 static bfd_boolean
990 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
991 struct bfd_link_hash_entry *h,
992 bfd_reloc_code_real_type reloc,
993 bfd *abfd,
994 asection *section,
995 bfd_vma value)
997 if (config.warn_constructors)
998 einfo (_("%P: warning: global constructor %s used\n"),
999 h->root.string);
1001 if (! config.build_constructors)
1002 return TRUE;
1004 ldctor_add_set_entry (h, reloc, NULL, section, value);
1006 if (h->type == bfd_link_hash_new)
1008 h->type = bfd_link_hash_undefined;
1009 h->u.undef.abfd = abfd;
1010 /* We don't call bfd_link_add_undef to add this to the list of
1011 undefined symbols because we are going to define it
1012 ourselves. */
1015 return TRUE;
1018 /* This is called when BFD has discovered a constructor. This is only
1019 called for some object file formats--those which do not handle
1020 constructors in some more clever fashion. This is similar to
1021 adding an element to a set, but less general. */
1023 static bfd_boolean
1024 constructor_callback (struct bfd_link_info *info,
1025 bfd_boolean constructor,
1026 const char *name,
1027 bfd *abfd,
1028 asection *section,
1029 bfd_vma value)
1031 char *s;
1032 struct bfd_link_hash_entry *h;
1033 char set_name[1 + sizeof "__CTOR_LIST__"];
1035 if (config.warn_constructors)
1036 einfo (_("%P: warning: global constructor %s used\n"), name);
1038 if (! config.build_constructors)
1039 return TRUE;
1041 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1042 useful error message. */
1043 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1044 && (info->relocatable
1045 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1046 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1048 s = set_name;
1049 if (bfd_get_symbol_leading_char (abfd) != '\0')
1050 *s++ = bfd_get_symbol_leading_char (abfd);
1051 if (constructor)
1052 strcpy (s, "__CTOR_LIST__");
1053 else
1054 strcpy (s, "__DTOR_LIST__");
1056 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1057 if (h == (struct bfd_link_hash_entry *) NULL)
1058 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1059 if (h->type == bfd_link_hash_new)
1061 h->type = bfd_link_hash_undefined;
1062 h->u.undef.abfd = abfd;
1063 /* We don't call bfd_link_add_undef to add this to the list of
1064 undefined symbols because we are going to define it
1065 ourselves. */
1068 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1069 return TRUE;
1072 /* A structure used by warning_callback to pass information through
1073 bfd_map_over_sections. */
1075 struct warning_callback_info
1077 bfd_boolean found;
1078 const char *warning;
1079 const char *symbol;
1080 asymbol **asymbols;
1083 /* This is called when there is a reference to a warning symbol. */
1085 static bfd_boolean
1086 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1087 const char *warning,
1088 const char *symbol,
1089 bfd *abfd,
1090 asection *section,
1091 bfd_vma address)
1093 /* This is a hack to support warn_multiple_gp. FIXME: This should
1094 have a cleaner interface, but what? */
1095 if (! config.warn_multiple_gp
1096 && strcmp (warning, "using multiple gp values") == 0)
1097 return TRUE;
1099 if (section != NULL)
1100 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1101 else if (abfd == NULL)
1102 einfo ("%P: %s%s\n", _("warning: "), warning);
1103 else if (symbol == NULL)
1104 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1105 else
1107 struct warning_callback_info cinfo;
1109 /* Look through the relocs to see if we can find a plausible
1110 address. */
1112 if (!bfd_generic_link_read_symbols (abfd))
1113 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1115 cinfo.found = FALSE;
1116 cinfo.warning = warning;
1117 cinfo.symbol = symbol;
1118 cinfo.asymbols = bfd_get_outsymbols (abfd);
1119 bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
1121 if (! cinfo.found)
1122 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1125 return TRUE;
1128 /* This is called by warning_callback for each section. It checks the
1129 relocs of the section to see if it can find a reference to the
1130 symbol which triggered the warning. If it can, it uses the reloc
1131 to give an error message with a file and line number. */
1133 static void
1134 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1136 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1137 long relsize;
1138 arelent **relpp;
1139 long relcount;
1140 arelent **p, **pend;
1142 if (info->found)
1143 return;
1145 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1146 if (relsize < 0)
1147 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1148 if (relsize == 0)
1149 return;
1151 relpp = (arelent **) xmalloc (relsize);
1152 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1153 if (relcount < 0)
1154 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1156 p = relpp;
1157 pend = p + relcount;
1158 for (; p < pend && *p != NULL; p++)
1160 arelent *q = *p;
1162 if (q->sym_ptr_ptr != NULL
1163 && *q->sym_ptr_ptr != NULL
1164 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1166 /* We found a reloc for the symbol we are looking for. */
1167 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1168 info->warning);
1169 info->found = TRUE;
1170 break;
1174 free (relpp);
1177 /* This is called when an undefined symbol is found. */
1179 static bfd_boolean
1180 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1181 const char *name,
1182 bfd *abfd,
1183 asection *section,
1184 bfd_vma address,
1185 bfd_boolean error)
1187 static char *error_name;
1188 static unsigned int error_count;
1190 #define MAX_ERRORS_IN_A_ROW 5
1192 if (config.warn_once)
1194 static struct bfd_hash_table *hash;
1196 /* Only warn once about a particular undefined symbol. */
1197 if (hash == NULL)
1199 hash = (struct bfd_hash_table *)
1200 xmalloc (sizeof (struct bfd_hash_table));
1201 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1202 sizeof (struct bfd_hash_entry)))
1203 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1206 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1207 return TRUE;
1209 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1210 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1213 /* We never print more than a reasonable number of errors in a row
1214 for a single symbol. */
1215 if (error_name != NULL
1216 && strcmp (name, error_name) == 0)
1217 ++error_count;
1218 else
1220 error_count = 0;
1221 if (error_name != NULL)
1222 free (error_name);
1223 error_name = xstrdup (name);
1226 if (section != NULL)
1228 if (error_count < MAX_ERRORS_IN_A_ROW)
1230 if (error)
1231 einfo (_("%X%C: undefined reference to `%T'\n"),
1232 abfd, section, address, name);
1233 else
1234 einfo (_("%C: warning: undefined reference to `%T'\n"),
1235 abfd, section, address, name);
1237 else if (error_count == MAX_ERRORS_IN_A_ROW)
1239 if (error)
1240 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1241 abfd, section, address, name);
1242 else
1243 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1244 abfd, section, address, name);
1246 else if (error)
1247 einfo ("%X");
1249 else
1251 if (error_count < MAX_ERRORS_IN_A_ROW)
1253 if (error)
1254 einfo (_("%X%B: undefined reference to `%T'\n"),
1255 abfd, name);
1256 else
1257 einfo (_("%B: warning: undefined reference to `%T'\n"),
1258 abfd, name);
1260 else if (error_count == MAX_ERRORS_IN_A_ROW)
1262 if (error)
1263 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1264 abfd, name);
1265 else
1266 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1267 abfd, name);
1269 else if (error)
1270 einfo ("%X");
1273 return TRUE;
1276 /* Counter to limit the number of relocation overflow error messages
1277 to print. Errors are printed as it is decremented. When it's
1278 called and the counter is zero, a final message is printed
1279 indicating more relocations were omitted. When it gets to -1, no
1280 such errors are printed. If it's initially set to a value less
1281 than -1, all such errors will be printed (--verbose does this). */
1283 int overflow_cutoff_limit = 10;
1285 /* This is called when a reloc overflows. */
1287 static bfd_boolean
1288 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1289 struct bfd_link_hash_entry *entry,
1290 const char *name,
1291 const char *reloc_name,
1292 bfd_vma addend,
1293 bfd *abfd,
1294 asection *section,
1295 bfd_vma address)
1297 if (overflow_cutoff_limit == -1)
1298 return TRUE;
1300 einfo ("%X%C:", abfd, section, address);
1302 if (overflow_cutoff_limit >= 0
1303 && overflow_cutoff_limit-- == 0)
1305 einfo (_(" additional relocation overflows omitted from the output\n"));
1306 return TRUE;
1309 if (entry)
1311 while (entry->type == bfd_link_hash_indirect
1312 || entry->type == bfd_link_hash_warning)
1313 entry = entry->u.i.link;
1314 switch (entry->type)
1316 case bfd_link_hash_undefined:
1317 case bfd_link_hash_undefweak:
1318 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1319 reloc_name, entry->root.string);
1320 break;
1321 case bfd_link_hash_defined:
1322 case bfd_link_hash_defweak:
1323 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1324 reloc_name, entry->root.string,
1325 entry->u.def.section,
1326 entry->u.def.section == bfd_abs_section_ptr
1327 ? link_info.output_bfd : entry->u.def.section->owner);
1328 break;
1329 default:
1330 abort ();
1331 break;
1334 else
1335 einfo (_(" relocation truncated to fit: %s against `%T'"),
1336 reloc_name, name);
1337 if (addend != 0)
1338 einfo ("+%v", addend);
1339 einfo ("\n");
1340 return TRUE;
1343 /* This is called when a dangerous relocation is made. */
1345 static bfd_boolean
1346 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1347 const char *message,
1348 bfd *abfd,
1349 asection *section,
1350 bfd_vma address)
1352 einfo (_("%X%C: dangerous relocation: %s\n"),
1353 abfd, section, address, message);
1354 return TRUE;
1357 /* This is called when a reloc is being generated attached to a symbol
1358 that is not being output. */
1360 static bfd_boolean
1361 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1362 const char *name,
1363 bfd *abfd,
1364 asection *section,
1365 bfd_vma address)
1367 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1368 abfd, section, address, name);
1369 return TRUE;
1372 /* This is called if link_info.notice_all is set, or when a symbol in
1373 link_info.notice_hash is found. Symbols are put in notice_hash
1374 using the -y option. */
1376 static bfd_boolean
1377 notice (struct bfd_link_info *info,
1378 const char *name,
1379 bfd *abfd,
1380 asection *section,
1381 bfd_vma value)
1383 if (name == NULL)
1385 if (command_line.cref || nocrossref_list != NULL)
1386 return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
1387 return TRUE;
1390 if (! info->notice_all
1391 || (info->notice_hash != NULL
1392 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1394 if (bfd_is_und_section (section))
1395 einfo ("%B: reference to %s\n", abfd, name);
1396 else
1397 einfo ("%B: definition of %s\n", abfd, name);
1400 if (command_line.cref || nocrossref_list != NULL)
1401 add_cref (name, abfd, section, value);
1403 return TRUE;