2000-07-20 H.J. Lu <hjl@gnu.org>
[binutils.git] / ld / ldmain.c
blob22d77a4b7cc37c12041a6227ad681465fa9fef63
1 /* Main program of GNU linker.
2 Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000
3 Free Software Foundation, Inc.
4 Written by Steve Chamberlain steve@cygnus.com
6 This file is part of GLD, the Gnu Linker.
8 GLD is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
13 GLD is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
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"
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"
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 #ifdef NEED_DECLARATION_SBRK
53 extern PTR sbrk ();
54 #endif
55 #endif
57 static char *get_emulation PARAMS ((int, char **));
58 static void set_scripts_dir PARAMS ((void));
60 /* EXPORTS */
62 char *default_target;
63 const char *output_filename = "a.out";
65 /* Name this program was invoked by. */
66 char *program_name;
68 /* The file that we're creating */
69 bfd *output_bfd = 0;
71 /* Set by -G argument, for MIPS ECOFF target. */
72 int g_switch_value = 8;
74 /* Nonzero means print names of input files as processed. */
75 boolean trace_files;
77 /* Nonzero means same, but note open failures, too. */
78 boolean trace_file_tries;
80 /* Nonzero means version number was printed, so exit successfully
81 instead of complaining if no input files are given. */
82 boolean version_printed;
84 /* Nonzero means link in every member of an archive. */
85 boolean whole_archive;
87 /* True if we should demangle symbol names. */
88 boolean demangling;
90 args_type command_line;
92 ld_config_type config;
94 static void remove_output PARAMS ((void));
95 static boolean check_for_scripts_dir PARAMS ((char *dir));
96 static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
97 const char *));
98 static boolean multiple_definition PARAMS ((struct bfd_link_info *,
99 const char *,
100 bfd *, asection *, bfd_vma,
101 bfd *, asection *, bfd_vma));
102 static 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));
107 static boolean add_to_set PARAMS ((struct bfd_link_info *,
108 struct bfd_link_hash_entry *,
109 bfd_reloc_code_real_type,
110 bfd *, asection *, bfd_vma));
111 static boolean constructor_callback PARAMS ((struct bfd_link_info *,
112 boolean constructor,
113 const char *name,
114 bfd *, asection *, bfd_vma));
115 static boolean warning_callback PARAMS ((struct bfd_link_info *,
116 const char *, const char *, bfd *,
117 asection *, bfd_vma));
118 static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
119 static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
120 const char *, bfd *,
121 asection *, bfd_vma, boolean));
122 static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
123 const char *, bfd_vma,
124 bfd *, asection *, bfd_vma));
125 static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
126 bfd *, asection *, bfd_vma));
127 static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
128 const char *, bfd *, asection *,
129 bfd_vma));
130 static boolean notice PARAMS ((struct bfd_link_info *, const char *,
131 bfd *, asection *, bfd_vma));
133 static struct bfd_link_callbacks link_callbacks =
135 add_archive_element,
136 multiple_definition,
137 multiple_common,
138 add_to_set,
139 constructor_callback,
140 warning_callback,
141 undefined_symbol,
142 reloc_overflow,
143 reloc_dangerous,
144 unattached_reloc,
145 notice
148 struct bfd_link_info link_info;
150 static void
151 remove_output ()
153 if (output_filename)
155 if (output_bfd && output_bfd->iostream)
156 fclose((FILE *)(output_bfd->iostream));
157 if (delete_output_file_on_failure)
158 unlink (output_filename);
163 main (argc, argv)
164 int argc;
165 char **argv;
167 char *emulation;
168 long start_time = get_run_time ();
170 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
171 setlocale (LC_MESSAGES, "");
172 #endif
173 bindtextdomain (PACKAGE, LOCALEDIR);
174 textdomain (PACKAGE);
176 program_name = argv[0];
177 xmalloc_set_program_name (program_name);
179 START_PROGRESS (program_name, 0);
181 bfd_init ();
183 bfd_set_error_program_name (program_name);
185 xatexit (remove_output);
187 /* Set the default BFD target based on the configured target. Doing
188 this permits the linker to be configured for a particular target,
189 and linked against a shared BFD library which was configured for
190 a different target. The macro TARGET is defined by Makefile. */
191 if (! bfd_set_default_target (TARGET))
193 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
194 xexit (1);
197 /* Initialize the data about options. */
198 trace_files = trace_file_tries = version_printed = false;
199 whole_archive = false;
200 config.build_constructors = true;
201 config.dynamic_link = false;
202 config.has_shared = false;
203 command_line.force_common_definition = false;
204 command_line.interpreter = NULL;
205 command_line.rpath = NULL;
206 command_line.warn_mismatch = true;
207 command_line.check_section_addresses = true;
209 /* We initialize DEMANGLING based on the environment variable
210 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
211 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
212 environment. Acting the same way here lets us provide the same
213 interface by default. */
214 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
216 link_info.callbacks = &link_callbacks;
217 link_info.relocateable = false;
218 link_info.emitrelocations = false;
219 link_info.shared = false;
220 link_info.symbolic = false;
221 link_info.static_link = false;
222 link_info.traditional_format = false;
223 link_info.optimize = false;
224 link_info.no_undefined = false;
225 link_info.strip = strip_none;
226 link_info.discard = discard_none;
227 link_info.keep_memory = true;
228 link_info.input_bfds = NULL;
229 link_info.create_object_symbols_section = NULL;
230 link_info.hash = NULL;
231 link_info.keep_hash = NULL;
232 link_info.notice_all = false;
233 link_info.notice_hash = NULL;
234 link_info.wrap_hash = NULL;
235 link_info.mpc860c0 = 0;
236 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
237 and _fini symbols. We are compatible. */
238 link_info.init_function = "_init";
239 link_info.fini_function = "_fini";
240 link_info.new_dtags = false;
241 link_info.flags = (bfd_vma) 0;
242 link_info.flags_1 = (bfd_vma) 0;
244 ldfile_add_arch ("");
246 config.make_executable = true;
247 force_make_executable = false;
248 config.magic_demand_paged = true;
249 config.text_read_only = true;
250 config.make_executable = true;
252 emulation = get_emulation (argc, argv);
253 ldemul_choose_mode (emulation);
254 default_target = ldemul_choose_target ();
255 lang_init ();
256 ldemul_before_parse ();
257 lang_has_input_file = false;
258 parse_args (argc, argv);
260 ldemul_set_symbols ();
262 if (link_info.relocateable)
264 if (command_line.gc_sections)
265 einfo ("%P%F: --gc-sections and -r may not be used together\n");
266 if (link_info.mpc860c0)
267 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
268 else if (command_line.relax)
269 einfo (_("%P%F: --relax and -r may not be used together\n"));
270 if (link_info.shared)
271 einfo (_("%P%F: -r and -shared may not be used together\n"));
274 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
275 don't see how else this can be handled, since in this case we
276 must preserve all externally visible symbols. */
277 if (link_info.relocateable && link_info.strip == strip_all)
279 link_info.strip = strip_debugger;
280 if (link_info.discard == discard_none)
281 link_info.discard = discard_all;
284 /* This essentially adds another -L directory so this must be done after
285 the -L's in argv have been processed. */
286 set_scripts_dir ();
288 if (had_script == false)
290 /* Read the emulation's appropriate default script. */
291 int isfile;
292 char *s = ldemul_get_script (&isfile);
294 if (isfile)
295 ldfile_open_command_file (s);
296 else
298 if (trace_file_tries)
300 info_msg (_("using internal linker script:\n"));
301 info_msg ("==================================================\n");
302 info_msg (s);
303 info_msg ("\n==================================================\n");
305 lex_string = s;
306 lex_redirect (s);
308 parser_input = input_script;
309 yyparse ();
310 lex_string = NULL;
313 lang_final ();
315 if (lang_has_input_file == false)
317 if (version_printed)
318 xexit (0);
319 einfo (_("%P%F: no input files\n"));
322 if (trace_files)
324 info_msg (_("%P: mode %s\n"), emulation);
327 ldemul_after_parse ();
330 if (config.map_filename)
332 if (strcmp (config.map_filename, "-") == 0)
334 config.map_file = stdout;
336 else
338 config.map_file = fopen (config.map_filename, FOPEN_WT);
339 if (config.map_file == (FILE *) NULL)
341 bfd_set_error (bfd_error_system_call);
342 einfo (_("%P%F: cannot open map file %s: %E\n"),
343 config.map_filename);
349 lang_process ();
351 /* Print error messages for any missing symbols, for any warning
352 symbols, and possibly multiple definitions */
354 if (! link_info.relocateable)
356 /* Look for a text section and switch the readonly attribute in it. */
357 asection * found = bfd_get_section_by_name (output_bfd, ".text");
359 if (found != (asection *) NULL)
361 if (config.text_read_only)
362 found->flags |= SEC_READONLY;
363 else
364 found->flags &= ~SEC_READONLY;
368 if (link_info.relocateable)
369 output_bfd->flags &= ~EXEC_P;
370 else
371 output_bfd->flags |= EXEC_P;
373 ldwrite ();
375 if (config.map_file != NULL)
376 lang_map ();
377 if (command_line.cref)
378 output_cref (config.map_file != NULL ? config.map_file : stdout);
379 if (nocrossref_list != NULL)
380 check_nocrossrefs ();
382 /* Even if we're producing relocateable output, some non-fatal errors should
383 be reported in the exit status. (What non-fatal errors, if any, do we
384 want to ignore for relocateable output?) */
386 if (config.make_executable == false && force_make_executable == false)
388 if (trace_files == true)
390 einfo (_("%P: link errors found, deleting executable `%s'\n"),
391 output_filename);
394 /* The file will be removed by remove_output. */
396 xexit (1);
398 else
400 if (! bfd_close (output_bfd))
401 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
403 /* If the --force-exe-suffix is enabled, and we're making an
404 executable file and it doesn't end in .exe, copy it to one which does. */
406 if (! link_info.relocateable && command_line.force_exe_suffix)
408 int len = strlen (output_filename);
409 if (len < 4
410 || (strcasecmp (output_filename + len - 4, ".exe") != 0
411 && strcasecmp (output_filename + len - 4, ".dll") != 0))
413 FILE *src;
414 FILE *dst;
415 const int bsize = 4096;
416 char *buf = xmalloc (bsize);
417 int l;
418 char *dst_name = xmalloc (len + 5);
419 strcpy (dst_name, output_filename);
420 strcat (dst_name, ".exe");
421 src = fopen (output_filename, FOPEN_RB);
422 dst = fopen (dst_name, FOPEN_WB);
424 if (!src)
425 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
426 if (!dst)
427 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
428 while ((l = fread (buf, 1, bsize, src)) > 0)
430 int done = fwrite (buf, 1, l, dst);
431 if (done != l)
433 einfo (_("%P: Error writing file `%s'\n"), dst_name);
436 fclose (src);
437 if (fclose (dst) == EOF)
439 einfo (_("%P: Error closing file `%s'\n"), dst_name);
441 free (dst_name);
442 free (buf);
447 END_PROGRESS (program_name);
449 if (config.stats)
451 #ifdef HAVE_SBRK
452 char *lim = (char *) sbrk (0);
453 #endif
454 long run_time = get_run_time () - start_time;
456 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
457 program_name, run_time / 1000000, run_time % 1000000);
458 #ifdef HAVE_SBRK
459 fprintf (stderr, _("%s: data size %ld\n"), program_name,
460 (long) (lim - (char *) &environ));
461 #endif
464 /* Prevent remove_output from doing anything, after a successful link. */
465 output_filename = NULL;
467 xexit (0);
468 return 0;
471 /* We need to find any explicitly given emulation in order to initialize the
472 state that's needed by the lex&yacc argument parser (parse_args). */
474 static char *
475 get_emulation (argc, argv)
476 int argc;
477 char **argv;
479 char *emulation;
480 int i;
482 emulation = getenv (EMULATION_ENVIRON);
483 if (emulation == NULL)
484 emulation = DEFAULT_EMULATION;
486 for (i = 1; i < argc; i++)
488 if (!strncmp (argv[i], "-m", 2))
490 if (argv[i][2] == '\0')
492 /* -m EMUL */
493 if (i < argc - 1)
495 emulation = argv[i + 1];
496 i++;
498 else
500 einfo(_("%P%F: missing argument to -m\n"));
503 else if (strcmp (argv[i], "-mips1") == 0
504 || strcmp (argv[i], "-mips2") == 0
505 || strcmp (argv[i], "-mips3") == 0
506 || strcmp (argv[i], "-mips4") == 0)
508 /* FIXME: The arguments -mips1, -mips2 and -mips3 are
509 passed to the linker by some MIPS compilers. They
510 generally tell the linker to use a slightly different
511 library path. Perhaps someday these should be
512 implemented as emulations; until then, we just ignore
513 the arguments and hope that nobody ever creates
514 emulations named ips1, ips2 or ips3. */
516 else if (strcmp (argv[i], "-m486") == 0)
518 /* FIXME: The argument -m486 is passed to the linker on
519 some Linux systems. Hope that nobody creates an
520 emulation named 486. */
522 else
524 /* -mEMUL */
525 emulation = &argv[i][2];
530 return emulation;
533 /* If directory DIR contains an "ldscripts" subdirectory,
534 add DIR to the library search path and return true,
535 else return false. */
537 static boolean
538 check_for_scripts_dir (dir)
539 char *dir;
541 size_t dirlen;
542 char *buf;
543 struct stat s;
544 boolean res;
546 dirlen = strlen (dir);
547 /* sizeof counts the terminating NUL. */
548 buf = (char *) xmalloc (dirlen + sizeof("/ldscripts"));
549 sprintf (buf, "%s/ldscripts", dir);
551 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
552 free (buf);
553 if (res)
554 ldfile_add_library_path (dir, false);
555 return res;
558 /* Set the default directory for finding script files.
559 Libraries will be searched for here too, but that's ok.
560 We look for the "ldscripts" directory in:
562 SCRIPTDIR (passed from Makefile)
563 the dir where this program is (for using it from the build tree)
564 the dir where this program is/../lib (for installing the tool suite elsewhere) */
566 static void
567 set_scripts_dir ()
569 char *end, *dir;
570 size_t dirlen;
572 if (check_for_scripts_dir (SCRIPTDIR))
573 return; /* We've been installed normally. */
575 /* Look for "ldscripts" in the dir where our binary is. */
576 end = strrchr (program_name, '/');
577 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
579 /* We could have \foo\bar, or /foo\bar. */
580 char *bslash = strrchr (program_name, '\\');
581 if (end == NULL || (bslash != NULL && bslash > end))
582 end = bslash;
584 #endif
586 if (end == NULL)
588 /* Don't look for ldscripts in the current directory. There is
589 too much potential for confusion. */
590 return;
593 dirlen = end - program_name;
594 /* Make a copy of program_name in dir.
595 Leave room for later "/../lib". */
596 dir = (char *) xmalloc (dirlen + 8);
597 strncpy (dir, program_name, dirlen);
598 dir[dirlen] = '\0';
600 if (check_for_scripts_dir (dir))
601 return; /* Don't free dir. */
603 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
604 strcpy (dir + dirlen, "/../lib");
605 if (check_for_scripts_dir (dir))
606 return;
608 free (dir); /* Well, we tried. */
611 void
612 add_ysym (name)
613 const char *name;
615 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
617 link_info.notice_hash = ((struct bfd_hash_table *)
618 xmalloc (sizeof (struct bfd_hash_table)));
619 if (! bfd_hash_table_init_n (link_info.notice_hash,
620 bfd_hash_newfunc,
621 61))
622 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
625 if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
626 == (struct bfd_hash_entry *) NULL)
627 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
630 /* Record a symbol to be wrapped, from the --wrap option. */
632 void
633 add_wrap (name)
634 const char *name;
636 if (link_info.wrap_hash == NULL)
638 link_info.wrap_hash = ((struct bfd_hash_table *)
639 xmalloc (sizeof (struct bfd_hash_table)));
640 if (! bfd_hash_table_init_n (link_info.wrap_hash,
641 bfd_hash_newfunc,
642 61))
643 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
645 if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
646 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
649 /* Handle the -retain-symbols-file option. */
651 void
652 add_keepsyms_file (filename)
653 const char *filename;
655 FILE *file;
656 char *buf;
657 size_t bufsize;
658 int c;
660 if (link_info.strip == strip_some)
661 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
663 file = fopen (filename, "r");
664 if (file == (FILE *) NULL)
666 bfd_set_error (bfd_error_system_call);
667 einfo ("%X%P: %s: %E\n", filename);
668 return;
671 link_info.keep_hash = ((struct bfd_hash_table *)
672 xmalloc (sizeof (struct bfd_hash_table)));
673 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
674 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
676 bufsize = 100;
677 buf = (char *) xmalloc (bufsize);
679 c = getc (file);
680 while (c != EOF)
682 while (isspace (c))
683 c = getc (file);
685 if (c != EOF)
687 size_t len = 0;
689 while (! isspace (c) && c != EOF)
691 buf[len] = c;
692 ++len;
693 if (len >= bufsize)
695 bufsize *= 2;
696 buf = xrealloc (buf, bufsize);
698 c = getc (file);
701 buf[len] = '\0';
703 if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
704 == (struct bfd_hash_entry *) NULL)
705 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
709 if (link_info.strip != strip_none)
710 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
712 link_info.strip = strip_some;
715 /* Callbacks from the BFD linker routines. */
717 /* This is called when BFD has decided to include an archive member in
718 a link. */
720 /*ARGSUSED*/
721 static boolean
722 add_archive_element (info, abfd, name)
723 struct bfd_link_info *info ATTRIBUTE_UNUSED;
724 bfd *abfd;
725 const char *name;
727 lang_input_statement_type *input;
729 input = ((lang_input_statement_type *)
730 xmalloc (sizeof (lang_input_statement_type)));
731 input->filename = abfd->filename;
732 input->local_sym_name = abfd->filename;
733 input->the_bfd = abfd;
734 input->asymbols = NULL;
735 input->next = NULL;
736 input->just_syms_flag = false;
737 input->loaded = false;
738 input->search_dirs_flag = false;
740 /* FIXME: The following fields are not set: header.next,
741 header.type, closed, passive_position, symbol_count,
742 next_real_file, is_archive, target, real. This bit of code is
743 from the old decode_library_subfile function. I don't know
744 whether any of those fields matters. */
746 ldlang_add_file (input);
748 if (config.map_file != (FILE *) NULL)
750 static boolean header_printed;
751 struct bfd_link_hash_entry *h;
752 bfd *from;
753 int len;
755 h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
757 if (h == NULL)
758 from = NULL;
759 else
761 switch (h->type)
763 default:
764 from = NULL;
765 break;
767 case bfd_link_hash_defined:
768 case bfd_link_hash_defweak:
769 from = h->u.def.section->owner;
770 break;
772 case bfd_link_hash_undefined:
773 case bfd_link_hash_undefweak:
774 from = h->u.undef.abfd;
775 break;
777 case bfd_link_hash_common:
778 from = h->u.c.p->section->owner;
779 break;
783 if (! header_printed)
785 char buf[100];
787 sprintf (buf, "%-29s %s\n\n", _("Archive member included"),
788 _("because of file (symbol)"));
789 minfo ("%s", buf);
790 header_printed = true;
793 if (bfd_my_archive (abfd) == NULL)
795 minfo ("%s", bfd_get_filename (abfd));
796 len = strlen (bfd_get_filename (abfd));
798 else
800 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
801 bfd_get_filename (abfd));
802 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
803 + strlen (bfd_get_filename (abfd))
804 + 2);
807 if (len >= 29)
809 print_nl ();
810 len = 0;
812 while (len < 30)
814 print_space ();
815 ++len;
818 if (from != NULL)
819 minfo ("%B ", from);
820 if (h != NULL)
821 minfo ("(%T)\n", h->root.string);
822 else
823 minfo ("(%s)\n", name);
826 if (trace_files || trace_file_tries)
827 info_msg ("%I\n", input);
829 return true;
832 /* This is called when BFD has discovered a symbol which is defined
833 multiple times. */
835 /*ARGSUSED*/
836 static boolean
837 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
838 struct bfd_link_info *info ATTRIBUTE_UNUSED;
839 const char *name;
840 bfd *obfd;
841 asection *osec;
842 bfd_vma oval;
843 bfd *nbfd;
844 asection *nsec;
845 bfd_vma nval;
847 /* If either section has the output_section field set to
848 bfd_abs_section_ptr, it means that the section is being
849 discarded, and this is not really a multiple definition at all.
850 FIXME: It would be cleaner to somehow ignore symbols defined in
851 sections which are being discarded. */
852 if ((osec->output_section != NULL
853 && ! bfd_is_abs_section (osec)
854 && bfd_is_abs_section (osec->output_section))
855 || (nsec->output_section != NULL
856 && ! bfd_is_abs_section (nsec)
857 && bfd_is_abs_section (nsec->output_section)))
858 return true;
860 einfo (_("%X%C: multiple definition of `%T'\n"),
861 nbfd, nsec, nval, name);
862 if (obfd != (bfd *) NULL)
863 einfo (_("%D: first defined here\n"), obfd, osec, oval);
864 return true;
867 /* This is called when there is a definition of a common symbol, or
868 when a common symbol is found for a symbol that is already defined,
869 or when two common symbols are found. We only do something if
870 -warn-common was used. */
872 /*ARGSUSED*/
873 static boolean
874 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
875 struct bfd_link_info *info ATTRIBUTE_UNUSED;
876 const char *name;
877 bfd *obfd;
878 enum bfd_link_hash_type otype;
879 bfd_vma osize;
880 bfd *nbfd;
881 enum bfd_link_hash_type ntype;
882 bfd_vma nsize;
884 if (! config.warn_common)
885 return true;
887 if (ntype == bfd_link_hash_defined
888 || ntype == bfd_link_hash_defweak
889 || ntype == bfd_link_hash_indirect)
891 ASSERT (otype == bfd_link_hash_common);
892 einfo (_("%B: warning: definition of `%T' overriding common\n"),
893 nbfd, name);
894 if (obfd != NULL)
895 einfo (_("%B: warning: common is here\n"), obfd);
897 else if (otype == bfd_link_hash_defined
898 || otype == bfd_link_hash_defweak
899 || otype == bfd_link_hash_indirect)
901 ASSERT (ntype == bfd_link_hash_common);
902 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
903 nbfd, name);
904 if (obfd != NULL)
905 einfo (_("%B: warning: defined here\n"), obfd);
907 else
909 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
910 if (osize > nsize)
912 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
913 nbfd, name);
914 if (obfd != NULL)
915 einfo (_("%B: warning: larger common is here\n"), obfd);
917 else if (nsize > osize)
919 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
920 nbfd, name);
921 if (obfd != NULL)
922 einfo (_("%B: warning: smaller common is here\n"), obfd);
924 else
926 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
927 if (obfd != NULL)
928 einfo (_("%B: warning: previous common is here\n"), obfd);
932 return true;
935 /* This is called when BFD has discovered a set element. H is the
936 entry in the linker hash table for the set. SECTION and VALUE
937 represent a value which should be added to the set. */
939 /*ARGSUSED*/
940 static boolean
941 add_to_set (info, h, reloc, abfd, section, value)
942 struct bfd_link_info *info ATTRIBUTE_UNUSED;
943 struct bfd_link_hash_entry *h;
944 bfd_reloc_code_real_type reloc;
945 bfd *abfd;
946 asection *section;
947 bfd_vma value;
949 if (config.warn_constructors)
950 einfo (_("%P: warning: global constructor %s used\n"),
951 h->root.string);
953 if (! config.build_constructors)
954 return true;
956 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
958 if (h->type == bfd_link_hash_new)
960 h->type = bfd_link_hash_undefined;
961 h->u.undef.abfd = abfd;
962 /* We don't call bfd_link_add_undef to add this to the list of
963 undefined symbols because we are going to define it
964 ourselves. */
967 return true;
970 /* This is called when BFD has discovered a constructor. This is only
971 called for some object file formats--those which do not handle
972 constructors in some more clever fashion. This is similar to
973 adding an element to a set, but less general. */
975 static boolean
976 constructor_callback (info, constructor, name, abfd, section, value)
977 struct bfd_link_info *info;
978 boolean constructor;
979 const char *name;
980 bfd *abfd;
981 asection *section;
982 bfd_vma value;
984 char *s;
985 struct bfd_link_hash_entry *h;
986 char set_name[1 + sizeof "__CTOR_LIST__"];
988 if (config.warn_constructors)
989 einfo (_("%P: warning: global constructor %s used\n"), name);
991 if (! config.build_constructors)
992 return true;
994 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
995 useful error message. */
996 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
997 && (link_info.relocateable
998 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
999 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1001 s = set_name;
1002 if (bfd_get_symbol_leading_char (abfd) != '\0')
1003 *s++ = bfd_get_symbol_leading_char (abfd);
1004 if (constructor)
1005 strcpy (s, "__CTOR_LIST__");
1006 else
1007 strcpy (s, "__DTOR_LIST__");
1009 h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
1010 if (h == (struct bfd_link_hash_entry *) NULL)
1011 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1012 if (h->type == bfd_link_hash_new)
1014 h->type = bfd_link_hash_undefined;
1015 h->u.undef.abfd = abfd;
1016 /* We don't call bfd_link_add_undef to add this to the list of
1017 undefined symbols because we are going to define it
1018 ourselves. */
1021 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1022 return true;
1025 /* A structure used by warning_callback to pass information through
1026 bfd_map_over_sections. */
1028 struct warning_callback_info
1030 boolean found;
1031 const char *warning;
1032 const char *symbol;
1033 asymbol **asymbols;
1036 /* This is called when there is a reference to a warning symbol. */
1038 /*ARGSUSED*/
1039 static boolean
1040 warning_callback (info, warning, symbol, abfd, section, address)
1041 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1042 const char *warning;
1043 const char *symbol;
1044 bfd *abfd;
1045 asection *section;
1046 bfd_vma address;
1048 /* This is a hack to support warn_multiple_gp. FIXME: This should
1049 have a cleaner interface, but what? */
1050 if (! config.warn_multiple_gp
1051 && strcmp (warning, "using multiple gp values") == 0)
1052 return true;
1054 if (section != NULL)
1055 einfo ("%C: %s\n", abfd, section, address, warning);
1056 else if (abfd == NULL)
1057 einfo ("%P: %s\n", warning);
1058 else if (symbol == NULL)
1059 einfo ("%B: %s\n", abfd, warning);
1060 else
1062 lang_input_statement_type *entry;
1063 asymbol **asymbols;
1064 struct warning_callback_info info;
1066 /* Look through the relocs to see if we can find a plausible
1067 address. */
1069 entry = (lang_input_statement_type *) abfd->usrdata;
1070 if (entry != NULL && entry->asymbols != NULL)
1071 asymbols = entry->asymbols;
1072 else
1074 long symsize;
1075 long symbol_count;
1077 symsize = bfd_get_symtab_upper_bound (abfd);
1078 if (symsize < 0)
1079 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1080 asymbols = (asymbol **) xmalloc (symsize);
1081 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1082 if (symbol_count < 0)
1083 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1084 if (entry != NULL)
1086 entry->asymbols = asymbols;
1087 entry->symbol_count = symbol_count;
1091 info.found = false;
1092 info.warning = warning;
1093 info.symbol = symbol;
1094 info.asymbols = asymbols;
1095 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1097 if (! info.found)
1098 einfo ("%B: %s\n", abfd, warning);
1100 if (entry == NULL)
1101 free (asymbols);
1104 return true;
1107 /* This is called by warning_callback for each section. It checks the
1108 relocs of the section to see if it can find a reference to the
1109 symbol which triggered the warning. If it can, it uses the reloc
1110 to give an error message with a file and line number. */
1112 static void
1113 warning_find_reloc (abfd, sec, iarg)
1114 bfd *abfd;
1115 asection *sec;
1116 PTR iarg;
1118 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1119 long relsize;
1120 arelent **relpp;
1121 long relcount;
1122 arelent **p, **pend;
1124 if (info->found)
1125 return;
1127 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1128 if (relsize < 0)
1129 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1130 if (relsize == 0)
1131 return;
1133 relpp = (arelent **) xmalloc (relsize);
1134 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1135 if (relcount < 0)
1136 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1138 p = relpp;
1139 pend = p + relcount;
1140 for (; p < pend && *p != NULL; p++)
1142 arelent *q = *p;
1144 if (q->sym_ptr_ptr != NULL
1145 && *q->sym_ptr_ptr != NULL
1146 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1148 /* We found a reloc for the symbol we are looking for. */
1149 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1150 info->found = true;
1151 break;
1155 free (relpp);
1158 /* This is called when an undefined symbol is found. */
1160 /*ARGSUSED*/
1161 static boolean
1162 undefined_symbol (info, name, abfd, section, address, fatal)
1163 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1164 const char *name;
1165 bfd *abfd;
1166 asection *section;
1167 bfd_vma address;
1168 boolean fatal ATTRIBUTE_UNUSED;
1170 static char *error_name;
1171 static unsigned int error_count;
1173 #define MAX_ERRORS_IN_A_ROW 5
1175 if (config.warn_once)
1177 static struct bfd_hash_table *hash;
1179 /* Only warn once about a particular undefined symbol. */
1181 if (hash == NULL)
1183 hash = ((struct bfd_hash_table *)
1184 xmalloc (sizeof (struct bfd_hash_table)));
1185 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1186 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1189 if (bfd_hash_lookup (hash, name, false, false) != NULL)
1190 return true;
1192 if (bfd_hash_lookup (hash, name, true, true) == NULL)
1193 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1196 /* We never print more than a reasonable number of errors in a row
1197 for a single symbol. */
1198 if (error_name != (char *) NULL
1199 && strcmp (name, error_name) == 0)
1200 ++error_count;
1201 else
1203 error_count = 0;
1204 if (error_name != (char *) NULL)
1205 free (error_name);
1206 error_name = buystring (name);
1209 if (section != NULL)
1211 if (error_count < MAX_ERRORS_IN_A_ROW)
1213 einfo (_("%C: undefined reference to `%T'\n"),
1214 abfd, section, address, name);
1215 if (fatal)
1216 einfo ("%X");
1218 else if (error_count == MAX_ERRORS_IN_A_ROW)
1219 einfo (_("%D: more undefined references to `%T' follow\n"),
1220 abfd, section, address, name);
1222 else
1224 if (error_count < MAX_ERRORS_IN_A_ROW)
1226 einfo (_("%B: undefined reference to `%T'\n"),
1227 abfd, name);
1228 if (fatal)
1229 einfo ("%X");
1231 else if (error_count == MAX_ERRORS_IN_A_ROW)
1232 einfo (_("%B: more undefined references to `%T' follow\n"),
1233 abfd, name);
1236 return true;
1239 /* This is called when a reloc overflows. */
1241 /*ARGSUSED*/
1242 static boolean
1243 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1244 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1245 const char *name;
1246 const char *reloc_name;
1247 bfd_vma addend;
1248 bfd *abfd;
1249 asection *section;
1250 bfd_vma address;
1252 if (abfd == (bfd *) NULL)
1253 einfo (_("%P%X: generated"));
1254 else
1255 einfo ("%X%C:", abfd, section, address);
1256 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1257 if (addend != 0)
1258 einfo ("+%v", addend);
1259 einfo ("\n");
1260 return true;
1263 /* This is called when a dangerous relocation is made. */
1265 /*ARGSUSED*/
1266 static boolean
1267 reloc_dangerous (info, message, abfd, section, address)
1268 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1269 const char *message;
1270 bfd *abfd;
1271 asection *section;
1272 bfd_vma address;
1274 if (abfd == (bfd *) NULL)
1275 einfo (_("%P%X: generated"));
1276 else
1277 einfo ("%X%C:", abfd, section, address);
1278 einfo (_("dangerous relocation: %s\n"), message);
1279 return true;
1282 /* This is called when a reloc is being generated attached to a symbol
1283 that is not being output. */
1285 /*ARGSUSED*/
1286 static boolean
1287 unattached_reloc (info, name, abfd, section, address)
1288 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1289 const char *name;
1290 bfd *abfd;
1291 asection *section;
1292 bfd_vma address;
1294 if (abfd == (bfd *) NULL)
1295 einfo (_("%P%X: generated"));
1296 else
1297 einfo ("%X%C:", abfd, section, address);
1298 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1299 return true;
1302 /* This is called if link_info.notice_all is set, or when a symbol in
1303 link_info.notice_hash is found. Symbols are put in notice_hash
1304 using the -y option. */
1306 static boolean
1307 notice (info, name, abfd, section, value)
1308 struct bfd_link_info *info;
1309 const char *name;
1310 bfd *abfd;
1311 asection *section;
1312 bfd_vma value;
1314 if (! info->notice_all
1315 || (info->notice_hash != NULL
1316 && bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
1318 if (bfd_is_und_section (section))
1319 einfo ("%B: reference to %s\n", abfd, name);
1320 else
1321 einfo ("%B: definition of %s\n", abfd, name);
1324 if (command_line.cref || nocrossref_list != NULL)
1325 add_cref (name, abfd, section, value);
1327 return true;