source: trunk/src/binutils/ld/ldmain.c@ 100

Last change on this file since 100 was 100, checked in by bird, 22 years ago

review. Added some comments and #ifs.
  • Property cvs2svn:cvs-rev set to 1.3
  • Property svn:eol-style set to native
  • Property svn:executable set to *
File size: 35.0 KB
Line 
1/* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
4 Written by Steve Chamberlain steve@cygnus.com
5
6This file is part of GLD, the Gnu Linker.
7
8GLD is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2, or (at your option)
11any later version.
12
13GLD is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with GLD; see the file COPYING. If not, write to the Free
20Software Foundation, 59 Temple Place - Suite 330, Boston, MA
2102111-1307, USA. */
22
23#include "bfd.h"
24#include "sysdep.h"
25#include <stdio.h>
26#include <ctype.h>
27#include "libiberty.h"
28#include "progress.h"
29#include "bfdlink.h"
30#include "filenames.h"
31
32#include "ld.h"
33#include "ldmain.h"
34#include "ldmisc.h"
35#include "ldwrite.h"
36#include "ldgram.h"
37#include "ldexp.h"
38#include "ldlang.h"
39#include "ldlex.h"
40#include "ldfile.h"
41#include "ldemul.h"
42#include "ldctor.h"
43
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
48
49#include <string.h>
50
51#ifdef HAVE_SBRK
52#ifdef NEED_DECLARATION_SBRK
53extern PTR sbrk ();
54#endif
55#endif
56
57static char *get_emulation PARAMS ((int, char **));
58static void set_scripts_dir PARAMS ((void));
59
60/* EXPORTS */
61
62char *default_target;
63const char *output_filename = "a.out";
64
65/* Name this program was invoked by. */
66char *program_name;
67
68/* The file that we're creating. */
69bfd *output_bfd = 0;
70
71/* Set by -G argument, for MIPS ECOFF target. */
72int g_switch_value = 8;
73
74/* Nonzero means print names of input files as processed. */
75boolean trace_files;
76
77/* Nonzero means same, but note open failures, too. */
78boolean trace_file_tries;
79
80/* Nonzero means version number was printed, so exit successfully
81 instead of complaining if no input files are given. */
82boolean version_printed;
83
84/* Nonzero means link in every member of an archive. */
85boolean whole_archive;
86
87/* True if we should demangle symbol names. */
88boolean demangling;
89
90args_type command_line;
91
92ld_config_type config;
93
94static void remove_output PARAMS ((void));
95static boolean check_for_scripts_dir PARAMS ((char *dir));
96static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
97 const char *));
98static boolean multiple_definition PARAMS ((struct bfd_link_info *,
99 const char *,
100 bfd *, asection *, bfd_vma,
101 bfd *, asection *, bfd_vma));
102static boolean multiple_common PARAMS ((struct bfd_link_info *,
103 const char *, bfd *,
104 enum bfd_link_hash_type, bfd_vma,
105 bfd *, enum bfd_link_hash_type,
106 bfd_vma));
107static boolean add_to_set PARAMS ((struct bfd_link_info *,
108 struct bfd_link_hash_entry *,
109 bfd_reloc_code_real_type,
110 bfd *, asection *, bfd_vma));
111static boolean constructor_callback PARAMS ((struct bfd_link_info *,
112 boolean constructor,
113 const char *name,
114 bfd *, asection *, bfd_vma));
115static boolean warning_callback PARAMS ((struct bfd_link_info *,
116 const char *, const char *, bfd *,
117 asection *, bfd_vma));
118static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
119static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
120 const char *, bfd *,
121 asection *, bfd_vma, boolean));
122static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
123 const char *, bfd_vma,
124 bfd *, asection *, bfd_vma));
125static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
126 bfd *, asection *, bfd_vma));
127static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
128 const char *, bfd *, asection *,
129 bfd_vma));
130static boolean notice PARAMS ((struct bfd_link_info *, const char *,
131 bfd *, asection *, bfd_vma));
132
133static struct bfd_link_callbacks link_callbacks = {
134 add_archive_element,
135 multiple_definition,
136 multiple_common,
137 add_to_set,
138 constructor_callback,
139 warning_callback,
140 undefined_symbol,
141 reloc_overflow,
142 reloc_dangerous,
143 unattached_reloc,
144 notice
145};
146
147struct bfd_link_info link_info;
148
149
150static void
151remove_output ()
152{
153 if (output_filename)
154 {
155 if (output_bfd && output_bfd->iostream)
156 fclose ((FILE *) (output_bfd->iostream));
157 if (delete_output_file_on_failure)
158 unlink (output_filename);
159 }
160}
161
162int
163main (argc, argv)
164 int argc;
165 char **argv;
166{
167 char *emulation;
168 long start_time = get_run_time ();
169
170#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
171 setlocale (LC_MESSAGES, "");
172#endif
173 bindtextdomain (PACKAGE, LOCALEDIR);
174 textdomain (PACKAGE);
175
176#ifdef __EMX__
177 _response (&argc, &argv);
178 program_name = _getname(argv[0]);
179#else
180 program_name = argv[0];
181#endif
182 xmalloc_set_program_name (program_name);
183
184 START_PROGRESS (program_name, 0);
185
186 bfd_init ();
187
188 bfd_set_error_program_name (program_name);
189
190 xatexit (remove_output);
191
192 /* Set the default BFD target based on the configured target. Doing
193 this permits the linker to be configured for a particular target,
194 and linked against a shared BFD library which was configured for
195 a different target. The macro TARGET is defined by Makefile. */
196 if (! bfd_set_default_target (TARGET))
197 {
198 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
199 xexit (1);
200 }
201
202 /* Initialize the data about options. */
203 trace_files = trace_file_tries = version_printed = false;
204 whole_archive = false;
205 config.build_constructors = true;
206 config.dynamic_link = false;
207 config.has_shared = false;
208 config.split_by_reloc = (unsigned) -1;
209 config.split_by_file = (bfd_size_type) -1;
210 command_line.force_common_definition = false;
211 command_line.interpreter = NULL;
212 command_line.rpath = NULL;
213 command_line.warn_mismatch = true;
214 command_line.check_section_addresses = true;
215
216 /* We initialize DEMANGLING based on the environment variable
217 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
218 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
219 environment. Acting the same way here lets us provide the same
220 interface by default. */
221 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
222
223 link_info.callbacks = &link_callbacks;
224 link_info.relocateable = false;
225 link_info.emitrelocations = false;
226 link_info.shared = false;
227 link_info.symbolic = false;
228 link_info.static_link = false;
229 link_info.traditional_format = false;
230 link_info.optimize = false;
231 link_info.no_undefined = false;
232 link_info.allow_shlib_undefined = false;
233 link_info.strip = strip_none;
234 link_info.discard = discard_none;
235 link_info.keep_memory = true;
236 link_info.input_bfds = NULL;
237 link_info.create_object_symbols_section = NULL;
238 link_info.hash = NULL;
239 link_info.keep_hash = NULL;
240 link_info.notice_all = false;
241 link_info.notice_hash = NULL;
242 link_info.wrap_hash = NULL;
243 link_info.mpc860c0 = 0;
244 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
245 and _fini symbols. We are compatible. */
246 link_info.init_function = "_init";
247 link_info.fini_function = "_fini";
248 link_info.new_dtags = false;
249 link_info.flags = (bfd_vma) 0;
250 link_info.flags_1 = (bfd_vma) 0;
251
252 ldfile_add_arch ("");
253
254 config.make_executable = true;
255 force_make_executable = false;
256 config.magic_demand_paged = true;
257 config.text_read_only = true;
258
259 emulation = get_emulation (argc, argv);
260 ldemul_choose_mode (emulation);
261 default_target = ldemul_choose_target ();
262 lang_init ();
263 ldemul_before_parse ();
264 lang_has_input_file = false;
265 parse_args (argc, argv);
266
267 ldemul_set_symbols ();
268
269 if (link_info.relocateable)
270 {
271 if (command_line.gc_sections)
272 einfo ("%P%F: --gc-sections and -r may not be used together\n");
273 if (link_info.mpc860c0)
274 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
275 else if (command_line.relax)
276 einfo (_("%P%F: --relax and -r may not be used together\n"));
277 if (link_info.shared)
278 einfo (_("%P%F: -r and -shared may not be used together\n"));
279 }
280
281 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
282 don't see how else this can be handled, since in this case we
283 must preserve all externally visible symbols. */
284 if (link_info.relocateable && link_info.strip == strip_all)
285 {
286 link_info.strip = strip_debugger;
287 if (link_info.discard == discard_none)
288 link_info.discard = discard_all;
289 }
290
291 /* This essentially adds another -L directory so this must be done after
292 the -L's in argv have been processed. */
293 set_scripts_dir ();
294
295 if (had_script == false)
296 {
297 /* Read the emulation's appropriate default script. */
298 int isfile;
299 char *s = ldemul_get_script (&isfile);
300
301 if (isfile)
302 ldfile_open_command_file (s);
303 else
304 {
305 if (trace_file_tries)
306 {
307 info_msg (_("using internal linker script:\n"));
308 info_msg ("==================================================\n");
309 info_msg (s);
310 info_msg ("\n==================================================\n");
311 }
312 lex_string = s;
313 lex_redirect (s);
314 }
315 parser_input = input_script;
316 yyparse ();
317 lex_string = NULL;
318 }
319
320 lang_final ();
321
322 if (lang_has_input_file == false)
323 {
324 if (version_printed)
325 xexit (0);
326 einfo (_("%P%F: no input files\n"));
327 }
328
329 if (trace_files)
330 {
331 info_msg (_("%P: mode %s\n"), emulation);
332 }
333
334 ldemul_after_parse ();
335
336 if (config.map_filename)
337 {
338 if (strcmp (config.map_filename, "-") == 0)
339 {
340 config.map_file = stdout;
341 }
342 else
343 {
344 config.map_file = fopen (config.map_filename, FOPEN_WT);
345 if (config.map_file == (FILE *) NULL)
346 {
347 bfd_set_error (bfd_error_system_call);
348 einfo (_("%P%F: cannot open map file %s: %E\n"),
349 config.map_filename);
350 }
351 }
352 }
353
354 lang_process ();
355
356 /* Print error messages for any missing symbols, for any warning
357 symbols, and possibly multiple definitions. */
358
359 if (! link_info.relocateable)
360 {
361 /* Look for a text section and switch the readonly attribute in it. */
362 asection *found = bfd_get_section_by_name (output_bfd, ".text");
363
364 if (found != (asection *) NULL)
365 {
366 if (config.text_read_only)
367 found->flags |= SEC_READONLY;
368 else
369 found->flags &= ~SEC_READONLY;
370 }
371 }
372
373 if (link_info.relocateable)
374 output_bfd->flags &= ~EXEC_P;
375 else
376 output_bfd->flags |= EXEC_P;
377
378 ldwrite ();
379
380 if (config.map_file != NULL)
381 lang_map ();
382 if (command_line.cref)
383 output_cref (config.map_file != NULL ? config.map_file : stdout);
384 if (nocrossref_list != NULL)
385 check_nocrossrefs ();
386
387 /* Even if we're producing relocateable output, some non-fatal errors should
388 be reported in the exit status. (What non-fatal errors, if any, do we
389 want to ignore for relocateable output?) */
390
391 if (config.make_executable == false && force_make_executable == false)
392 {
393 if (trace_files == true)
394 {
395 einfo (_("%P: link errors found, deleting executable `%s'\n"),
396 output_filename);
397 }
398
399 /* The file will be removed by remove_output. */
400
401 xexit (1);
402 }
403 else
404 {
405 if (! bfd_close (output_bfd))
406 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
407
408 /* Perform the final actions on output file
409 * (Added by the EMX/OS2 port) */
410 ldemul_finish_link (output_filename);
411
412 /* If the --force-exe-suffix is enabled, and we're making an
413 executable file and it doesn't end in .exe, copy it to one
414 which does. */
415 if (! link_info.relocateable && command_line.force_exe_suffix)
416 {
417 int len = strlen (output_filename);
418 if (len < 4
419 || (strcasecmp (output_filename + len - 4, ".exe") != 0
420 && strcasecmp (output_filename + len - 4, ".dll") != 0))
421 {
422 FILE *src;
423 FILE *dst;
424 const int bsize = 4096;
425 char *buf = xmalloc (bsize);
426 int l;
427 char *dst_name = xmalloc (len + 5);
428 strcpy (dst_name, output_filename);
429 strcat (dst_name, ".exe");
430 src = fopen (output_filename, FOPEN_RB);
431 dst = fopen (dst_name, FOPEN_WB);
432
433 if (!src)
434 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
435 if (!dst)
436 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
437 while ((l = fread (buf, 1, bsize, src)) > 0)
438 {
439 int done = fwrite (buf, 1, l, dst);
440 if (done != l)
441 {
442 einfo (_("%P: Error writing file `%s'\n"), dst_name);
443 }
444 }
445 fclose (src);
446 if (fclose (dst) == EOF)
447 {
448 einfo (_("%P: Error closing file `%s'\n"), dst_name);
449 }
450 free (dst_name);
451 free (buf);
452 }
453 }
454 }
455
456 END_PROGRESS (program_name);
457
458 if (config.stats)
459 {
460#ifdef HAVE_SBRK
461 char *lim = (char *) sbrk (0);
462#endif
463 long run_time = get_run_time () - start_time;
464
465 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
466 program_name, run_time / 1000000, run_time % 1000000);
467#ifdef HAVE_SBRK
468 fprintf (stderr, _("%s: data size %ld\n"), program_name,
469 (long) (lim - (char *) &environ));
470#endif
471 }
472
473 /* Prevent remove_output from doing anything, after a successful link. */
474 output_filename = NULL;
475
476 xexit (0);
477 return 0;
478}
479
480/* We need to find any explicitly given emulation in order to initialize the
481 state that's needed by the lex&yacc argument parser (parse_args). */
482
483static char *
484get_emulation (argc, argv)
485 int argc;
486 char **argv;
487{
488 char *emulation;
489 int i;
490
491 emulation = getenv (EMULATION_ENVIRON);
492 if (emulation == NULL)
493 emulation = DEFAULT_EMULATION;
494
495 for (i = 1; i < argc; i++)
496 {
497 if (!strncmp (argv[i], "-m", 2))
498 {
499 if (argv[i][2] == '\0')
500 {
501 /* -m EMUL */
502 if (i < argc - 1)
503 {
504 emulation = argv[i + 1];
505 i++;
506 }
507 else
508 {
509 einfo (_("%P%F: missing argument to -m\n"));
510 }
511 }
512 else if (strcmp (argv[i], "-mips1") == 0
513 || strcmp (argv[i], "-mips2") == 0
514 || strcmp (argv[i], "-mips3") == 0
515 || strcmp (argv[i], "-mips4") == 0)
516 {
517 /* FIXME: The arguments -mips1, -mips2 and -mips3 are
518 passed to the linker by some MIPS compilers. They
519 generally tell the linker to use a slightly different
520 library path. Perhaps someday these should be
521 implemented as emulations; until then, we just ignore
522 the arguments and hope that nobody ever creates
523 emulations named ips1, ips2 or ips3. */
524 }
525 else if (strcmp (argv[i], "-m486") == 0)
526 {
527 /* FIXME: The argument -m486 is passed to the linker on
528 some Linux systems. Hope that nobody creates an
529 emulation named 486. */
530 }
531 else
532 {
533 /* -mEMUL */
534 emulation = &argv[i][2];
535 }
536 }
537 }
538
539 return emulation;
540}
541
542/* If directory DIR contains an "ldscripts" subdirectory,
543 add DIR to the library search path and return true,
544 else return false. */
545
546static boolean
547check_for_scripts_dir (dir)
548 char *dir;
549{
550 size_t dirlen;
551 char *buf;
552 struct stat s;
553 boolean res;
554
555 dirlen = strlen (dir);
556 /* sizeof counts the terminating NUL. */
557 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
558 sprintf (buf, "%s/ldscripts", dir);
559
560 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
561 free (buf);
562 if (res)
563 ldfile_add_library_path (dir, false);
564 return res;
565}
566
567/* Set the default directory for finding script files.
568 Libraries will be searched for here too, but that's ok.
569 We look for the "ldscripts" directory in:
570
571 SCRIPTDIR (passed from Makefile)
572 the dir where this program is (for using it from the build tree)
573 the dir where this program is/../lib (for installing the tool suite elsewhere) */
574
575static void
576set_scripts_dir ()
577{
578 char *end, *dir;
579 size_t dirlen;
580
581 if (check_for_scripts_dir (SCRIPTDIR))
582 /* We've been installed normally. */
583 return;
584
585 /* Look for "ldscripts" in the dir where our binary is. */
586 end = strrchr (program_name, '/');
587#ifdef HAVE_DOS_BASED_FILE_SYSTEM
588 {
589 /* We could have \foo\bar, or /foo\bar. */
590 char *bslash = strrchr (program_name, '\\');
591 if (end == NULL || (bslash != NULL && bslash > end))
592 end = bslash;
593 }
594#endif
595
596 if (end == NULL)
597 {
598 /* Don't look for ldscripts in the current directory. There is
599 too much potential for confusion. */
600 return;
601 }
602
603 dirlen = end - program_name;
604 /* Make a copy of program_name in dir.
605 Leave room for later "/../lib". */
606 dir = (char *) xmalloc (dirlen + 8);
607 strncpy (dir, program_name, dirlen);
608 dir[dirlen] = '\0';
609
610 if (check_for_scripts_dir (dir))
611 /* Don't free dir. */
612 return;
613
614 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
615 strcpy (dir + dirlen, "/../lib");
616 if (check_for_scripts_dir (dir))
617 return;
618
619 /* Well, we tried. */
620 free (dir);
621}
622
623void
624add_ysym (name)
625 const char *name;
626{
627 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
628 {
629 link_info.notice_hash = ((struct bfd_hash_table *)
630 xmalloc (sizeof (struct bfd_hash_table)));
631 if (! bfd_hash_table_init_n (link_info.notice_hash,
632 bfd_hash_newfunc,
633 61))
634 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
635 }
636
637 if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
638 == (struct bfd_hash_entry *) NULL)
639 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
640}
641
642/* Record a symbol to be wrapped, from the --wrap option. */
643
644void
645add_wrap (name)
646 const char *name;
647{
648 if (link_info.wrap_hash == NULL)
649 {
650 link_info.wrap_hash = ((struct bfd_hash_table *)
651 xmalloc (sizeof (struct bfd_hash_table)));
652 if (! bfd_hash_table_init_n (link_info.wrap_hash,
653 bfd_hash_newfunc,
654 61))
655 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
656 }
657 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
658 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
659}
660
661/* Handle the -retain-symbols-file option. */
662
663void
664add_keepsyms_file (filename)
665 const char *filename;
666{
667 FILE *file;
668 char *buf;
669 size_t bufsize;
670 int c;
671
672 if (link_info.strip == strip_some)
673 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
674
675 file = fopen (filename, "r");
676 if (file == (FILE *) NULL)
677 {
678 bfd_set_error (bfd_error_system_call);
679 einfo ("%X%P: %s: %E\n", filename);
680 return;
681 }
682
683 link_info.keep_hash = ((struct bfd_hash_table *)
684 xmalloc (sizeof (struct bfd_hash_table)));
685 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
686 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
687
688 bufsize = 100;
689 buf = (char *) xmalloc (bufsize);
690
691 c = getc (file);
692 while (c != EOF)
693 {
694 while (isspace (c))
695 c = getc (file);
696
697 if (c != EOF)
698 {
699 size_t len = 0;
700
701 while (! isspace (c) && c != EOF)
702 {
703 buf[len] = c;
704 ++len;
705 if (len >= bufsize)
706 {
707 bufsize *= 2;
708 buf = xrealloc (buf, bufsize);
709 }
710 c = getc (file);
711 }
712
713 buf[len] = '\0';
714
715 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
716 == (struct bfd_hash_entry *) NULL)
717 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
718 }
719 }
720
721 if (link_info.strip != strip_none)
722 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
723
724 link_info.strip = strip_some;
725}
726
727
728/* Callbacks from the BFD linker routines. */
729
730/* This is called when BFD has decided to include an archive member in
731 a link. */
732
733static boolean
734add_archive_element (info, abfd, name)
735 struct bfd_link_info *info ATTRIBUTE_UNUSED;
736 bfd *abfd;
737 const char *name;
738{
739 lang_input_statement_type *input;
740
741 input = ((lang_input_statement_type *)
742 xmalloc (sizeof (lang_input_statement_type)));
743 input->filename = abfd->filename;
744 input->local_sym_name = abfd->filename;
745 input->the_bfd = abfd;
746 input->asymbols = NULL;
747 input->next = NULL;
748 input->just_syms_flag = false;
749 input->loaded = false;
750 input->search_dirs_flag = false;
751
752 /* FIXME: The following fields are not set: header.next,
753 header.type, closed, passive_position, symbol_count,
754 next_real_file, is_archive, target, real. This bit of code is
755 from the old decode_library_subfile function. I don't know
756 whether any of those fields matters. */
757
758 ldlang_add_file (input);
759
760 if (config.map_file != (FILE *) NULL)
761 {
762 static boolean header_printed;
763 struct bfd_link_hash_entry *h;
764 bfd *from;
765 int len;
766
767 h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
768
769 if (h == NULL)
770 from = NULL;
771 else
772 {
773 switch (h->type)
774 {
775 default:
776 from = NULL;
777 break;
778
779 case bfd_link_hash_defined:
780 case bfd_link_hash_defweak:
781 from = h->u.def.section->owner;
782 break;
783
784 case bfd_link_hash_undefined:
785 case bfd_link_hash_undefweak:
786 from = h->u.undef.abfd;
787 break;
788
789 case bfd_link_hash_common:
790 from = h->u.c.p->section->owner;
791 break;
792 }
793 }
794
795 if (! header_printed)
796 {
797 char buf[100];
798
799 sprintf (buf, "%-29s %s\n\n", _("Archive member included"),
800 _("because of file (symbol)"));
801 minfo ("%s", buf);
802 header_printed = true;
803 }
804
805 if (bfd_my_archive (abfd) == NULL)
806 {
807 minfo ("%s", bfd_get_filename (abfd));
808 len = strlen (bfd_get_filename (abfd));
809 }
810 else
811 {
812 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
813 bfd_get_filename (abfd));
814 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
815 + strlen (bfd_get_filename (abfd))
816 + 2);
817 }
818
819 if (len >= 29)
820 {
821 print_nl ();
822 len = 0;
823 }
824 while (len < 30)
825 {
826 print_space ();
827 ++len;
828 }
829
830 if (from != NULL)
831 minfo ("%B ", from);
832 if (h != NULL)
833 minfo ("(%T)\n", h->root.string);
834 else
835 minfo ("(%s)\n", name);
836 }
837
838 if (trace_files || trace_file_tries)
839 info_msg ("%I\n", input);
840
841 return true;
842}
843
844/* This is called when BFD has discovered a symbol which is defined
845 multiple times. */
846
847static boolean
848multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
849 struct bfd_link_info *info ATTRIBUTE_UNUSED;
850 const char *name;
851 bfd *obfd;
852 asection *osec;
853 bfd_vma oval;
854 bfd *nbfd;
855 asection *nsec;
856 bfd_vma nval;
857{
858 /* If either section has the output_section field set to
859 bfd_abs_section_ptr, it means that the section is being
860 discarded, and this is not really a multiple definition at all.
861 FIXME: It would be cleaner to somehow ignore symbols defined in
862 sections which are being discarded. */
863 if ((osec->output_section != NULL
864 && ! bfd_is_abs_section (osec)
865 && bfd_is_abs_section (osec->output_section))
866 || (nsec->output_section != NULL
867 && ! bfd_is_abs_section (nsec)
868 && bfd_is_abs_section (nsec->output_section)))
869 return true;
870
871 einfo (_("%X%C: multiple definition of `%T'\n"),
872 nbfd, nsec, nval, name);
873 if (obfd != (bfd *) NULL)
874 einfo (_("%D: first defined here\n"), obfd, osec, oval);
875
876 if (command_line.relax)
877 {
878 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
879 command_line.relax = 0;
880 }
881
882 return true;
883}
884
885/* This is called when there is a definition of a common symbol, or
886 when a common symbol is found for a symbol that is already defined,
887 or when two common symbols are found. We only do something if
888 -warn-common was used. */
889
890static boolean
891multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
892 struct bfd_link_info *info ATTRIBUTE_UNUSED;
893 const char *name;
894 bfd *obfd;
895 enum bfd_link_hash_type otype;
896 bfd_vma osize;
897 bfd *nbfd;
898 enum bfd_link_hash_type ntype;
899 bfd_vma nsize;
900{
901 if (! config.warn_common)
902 return true;
903
904 if (ntype == bfd_link_hash_defined
905 || ntype == bfd_link_hash_defweak
906 || ntype == bfd_link_hash_indirect)
907 {
908 ASSERT (otype == bfd_link_hash_common);
909 einfo (_("%B: warning: definition of `%T' overriding common\n"),
910 nbfd, name);
911 if (obfd != NULL)
912 einfo (_("%B: warning: common is here\n"), obfd);
913 }
914 else if (otype == bfd_link_hash_defined
915 || otype == bfd_link_hash_defweak
916 || otype == bfd_link_hash_indirect)
917 {
918 ASSERT (ntype == bfd_link_hash_common);
919 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
920 nbfd, name);
921 if (obfd != NULL)
922 einfo (_("%B: warning: defined here\n"), obfd);
923 }
924 else
925 {
926 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
927 if (osize > nsize)
928 {
929 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
930 nbfd, name);
931 if (obfd != NULL)
932 einfo (_("%B: warning: larger common is here\n"), obfd);
933 }
934 else if (nsize > osize)
935 {
936 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
937 nbfd, name);
938 if (obfd != NULL)
939 einfo (_("%B: warning: smaller common is here\n"), obfd);
940 }
941 else
942 {
943 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
944 if (obfd != NULL)
945 einfo (_("%B: warning: previous common is here\n"), obfd);
946 }
947 }
948
949 return true;
950}
951
952/* This is called when BFD has discovered a set element. H is the
953 entry in the linker hash table for the set. SECTION and VALUE
954 represent a value which should be added to the set. */
955
956static boolean
957add_to_set (info, h, reloc, abfd, section, value)
958 struct bfd_link_info *info ATTRIBUTE_UNUSED;
959 struct bfd_link_hash_entry *h;
960 bfd_reloc_code_real_type reloc;
961 bfd *abfd;
962 asection *section;
963 bfd_vma value;
964{
965 if (config.warn_constructors)
966 einfo (_("%P: warning: global constructor %s used\n"),
967 h->root.string);
968
969 if (! config.build_constructors)
970 return true;
971
972 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
973
974 if (h->type == bfd_link_hash_new)
975 {
976 h->type = bfd_link_hash_undefined;
977 h->u.undef.abfd = abfd;
978 /* We don't call bfd_link_add_undef to add this to the list of
979 undefined symbols because we are going to define it
980 ourselves. */
981 }
982
983 return true;
984}
985
986/* This is called when BFD has discovered a constructor. This is only
987 called for some object file formats--those which do not handle
988 constructors in some more clever fashion. This is similar to
989 adding an element to a set, but less general. */
990
991static boolean
992constructor_callback (info, constructor, name, abfd, section, value)
993 struct bfd_link_info *info;
994 boolean constructor;
995 const char *name;
996 bfd *abfd;
997 asection *section;
998 bfd_vma value;
999{
1000 char *s;
1001 struct bfd_link_hash_entry *h;
1002 char set_name[1 + sizeof "__CTOR_LIST__"];
1003
1004 if (config.warn_constructors)
1005 einfo (_("%P: warning: global constructor %s used\n"), name);
1006
1007 if (! config.build_constructors)
1008 return true;
1009
1010 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1011 useful error message. */
1012 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1013 && (link_info.relocateable
1014 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1015 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1016
1017 s = set_name;
1018 if (bfd_get_symbol_leading_char (abfd) != '\0')
1019 *s++ = bfd_get_symbol_leading_char (abfd);
1020 if (constructor)
1021 strcpy (s, "__CTOR_LIST__");
1022 else
1023 strcpy (s, "__DTOR_LIST__");
1024
1025 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1026 if (h == (struct bfd_link_hash_entry *) NULL)
1027 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1028 if (h->type == bfd_link_hash_new)
1029 {
1030 h->type = bfd_link_hash_undefined;
1031 h->u.undef.abfd = abfd;
1032 /* We don't call bfd_link_add_undef to add this to the list of
1033 undefined symbols because we are going to define it
1034 ourselves. */
1035 }
1036
1037 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1038 return true;
1039}
1040
1041/* A structure used by warning_callback to pass information through
1042 bfd_map_over_sections. */
1043
1044struct warning_callback_info {
1045 boolean found;
1046 const char *warning;
1047 const char *symbol;
1048 asymbol **asymbols;
1049};
1050
1051/* This is called when there is a reference to a warning symbol. */
1052
1053static boolean
1054warning_callback (info, warning, symbol, abfd, section, address)
1055 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1056 const char *warning;
1057 const char *symbol;
1058 bfd *abfd;
1059 asection *section;
1060 bfd_vma address;
1061{
1062 /* This is a hack to support warn_multiple_gp. FIXME: This should
1063 have a cleaner interface, but what? */
1064 if (! config.warn_multiple_gp
1065 && strcmp (warning, "using multiple gp values") == 0)
1066 return true;
1067
1068 if (section != NULL)
1069 einfo ("%C: %s\n", abfd, section, address, warning);
1070 else if (abfd == NULL)
1071 einfo ("%P: %s\n", warning);
1072 else if (symbol == NULL)
1073 einfo ("%B: %s\n", abfd, warning);
1074 else
1075 {
1076 lang_input_statement_type *entry;
1077 asymbol **asymbols;
1078 struct warning_callback_info info;
1079
1080 /* Look through the relocs to see if we can find a plausible
1081 address. */
1082
1083 entry = (lang_input_statement_type *) abfd->usrdata;
1084 if (entry != NULL && entry->asymbols != NULL)
1085 asymbols = entry->asymbols;
1086 else
1087 {
1088 long symsize;
1089 long symbol_count;
1090
1091 symsize = bfd_get_symtab_upper_bound (abfd);
1092 if (symsize < 0)
1093 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1094 asymbols = (asymbol **) xmalloc (symsize);
1095 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1096 if (symbol_count < 0)
1097 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1098 if (entry != NULL)
1099 {
1100 entry->asymbols = asymbols;
1101 entry->symbol_count = symbol_count;
1102 }
1103 }
1104
1105 info.found = false;
1106 info.warning = warning;
1107 info.symbol = symbol;
1108 info.asymbols = asymbols;
1109 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1110
1111 if (! info.found)
1112 einfo ("%B: %s\n", abfd, warning);
1113
1114 if (entry == NULL)
1115 free (asymbols);
1116 }
1117
1118 return true;
1119}
1120
1121/* This is called by warning_callback for each section. It checks the
1122 relocs of the section to see if it can find a reference to the
1123 symbol which triggered the warning. If it can, it uses the reloc
1124 to give an error message with a file and line number. */
1125
1126static void
1127warning_find_reloc (abfd, sec, iarg)
1128 bfd *abfd;
1129 asection *sec;
1130 PTR iarg;
1131{
1132 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1133 long relsize;
1134 arelent **relpp;
1135 long relcount;
1136 arelent **p, **pend;
1137
1138 if (info->found)
1139 return;
1140
1141 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1142 if (relsize < 0)
1143 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1144 if (relsize == 0)
1145 return;
1146
1147 relpp = (arelent **) xmalloc (relsize);
1148 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1149 if (relcount < 0)
1150 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1151
1152 p = relpp;
1153 pend = p + relcount;
1154 for (; p < pend && *p != NULL; p++)
1155 {
1156 arelent *q = *p;
1157
1158 if (q->sym_ptr_ptr != NULL
1159 && *q->sym_ptr_ptr != NULL
1160 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1161 {
1162 /* We found a reloc for the symbol we are looking for. */
1163 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1164 info->found = true;
1165 break;
1166 }
1167 }
1168
1169 free (relpp);
1170}
1171
1172/* This is called when an undefined symbol is found. */
1173
1174static boolean
1175undefined_symbol (info, name, abfd, section, address, fatal)
1176 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1177 const char *name;
1178 bfd *abfd;
1179 asection *section;
1180 bfd_vma address;
1181 boolean fatal ATTRIBUTE_UNUSED;
1182{
1183 static char *error_name;
1184 static unsigned int error_count;
1185
1186#define MAX_ERRORS_IN_A_ROW 5
1187
1188 if (config.warn_once)
1189 {
1190 static struct bfd_hash_table *hash;
1191
1192 /* Only warn once about a particular undefined symbol. */
1193
1194 if (hash == NULL)
1195 {
1196 hash = ((struct bfd_hash_table *)
1197 xmalloc (sizeof (struct bfd_hash_table)));
1198 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1199 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1200 }
1201
1202 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1203 return true;
1204
1205 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1206 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1207 }
1208
1209 /* We never print more than a reasonable number of errors in a row
1210 for a single symbol. */
1211 if (error_name != (char *) NULL
1212 && strcmp (name, error_name) == 0)
1213 ++error_count;
1214 else
1215 {
1216 error_count = 0;
1217 if (error_name != (char *) NULL)
1218 free (error_name);
1219 error_name = xstrdup (name);
1220 }
1221
1222 if (section != NULL)
1223 {
1224 if (error_count < MAX_ERRORS_IN_A_ROW)
1225 {
1226 einfo (_("%C: undefined reference to `%T'\n"),
1227 abfd, section, address, name);
1228 if (fatal)
1229 einfo ("%X");
1230 }
1231 else if (error_count == MAX_ERRORS_IN_A_ROW)
1232 einfo (_("%D: more undefined references to `%T' follow\n"),
1233 abfd, section, address, name);
1234 }
1235 else
1236 {
1237 if (error_count < MAX_ERRORS_IN_A_ROW)
1238 {
1239 einfo (_("%B: undefined reference to `%T'\n"),
1240 abfd, name);
1241 if (fatal)
1242 einfo ("%X");
1243 }
1244 else if (error_count == MAX_ERRORS_IN_A_ROW)
1245 einfo (_("%B: more undefined references to `%T' follow\n"),
1246 abfd, name);
1247 }
1248
1249 return true;
1250}
1251
1252/* This is called when a reloc overflows. */
1253
1254static boolean
1255reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1256 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1257 const char *name;
1258 const char *reloc_name;
1259 bfd_vma addend;
1260 bfd *abfd;
1261 asection *section;
1262 bfd_vma address;
1263{
1264 if (abfd == (bfd *) NULL)
1265 einfo (_("%P%X: generated"));
1266 else
1267 einfo ("%X%C:", abfd, section, address);
1268 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1269 if (addend != 0)
1270 einfo ("+%v", addend);
1271 einfo ("\n");
1272 return true;
1273}
1274
1275/* This is called when a dangerous relocation is made. */
1276
1277static boolean
1278reloc_dangerous (info, message, abfd, section, address)
1279 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1280 const char *message;
1281 bfd *abfd;
1282 asection *section;
1283 bfd_vma address;
1284{
1285 if (abfd == (bfd *) NULL)
1286 einfo (_("%P%X: generated"));
1287 else
1288 einfo ("%X%C:", abfd, section, address);
1289 einfo (_("dangerous relocation: %s\n"), message);
1290 return true;
1291}
1292
1293/* This is called when a reloc is being generated attached to a symbol
1294 that is not being output. */
1295
1296static boolean
1297unattached_reloc (info, name, abfd, section, address)
1298 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1299 const char *name;
1300 bfd *abfd;
1301 asection *section;
1302 bfd_vma address;
1303{
1304 if (abfd == (bfd *) NULL)
1305 einfo (_("%P%X: generated"));
1306 else
1307 einfo ("%X%C:", abfd, section, address);
1308 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1309 return true;
1310}
1311
1312/* This is called if link_info.notice_all is set, or when a symbol in
1313 link_info.notice_hash is found. Symbols are put in notice_hash
1314 using the -y option. */
1315
1316static boolean
1317notice (info, name, abfd, section, value)
1318 struct bfd_link_info *info;
1319 const char *name;
1320 bfd *abfd;
1321 asection *section;
1322 bfd_vma value;
1323{
1324 if (! info->notice_all
1325 || (info->notice_hash != NULL
1326 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1327 {
1328 if (bfd_is_und_section (section))
1329 einfo ("%B: reference to %s\n", abfd, name);
1330 else
1331 einfo ("%B: definition of %s\n", abfd, name);
1332 }
1333
1334 if (command_line.cref || nocrossref_list != NULL)
1335 add_cref (name, abfd, section, value);
1336
1337 return true;
1338}
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