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[binutils.git] / ld / ldmain.c
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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
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 /* Nonzero means create DT_NEEDED entries only if a dynamic library
97 actually satisfies some reference in a regular object. */
98 bfd_boolean as_needed;
100 /* Nonzero means never create DT_NEEDED entries for dynamic libraries
101 in DT_NEEDED tags. */
102 bfd_boolean add_needed = TRUE;
104 /* TRUE if we should demangle symbol names. */
105 bfd_boolean demangling;
107 args_type command_line;
109 ld_config_type config;
111 sort_type sort_section;
113 static const char *get_sysroot
114 (int, char **);
115 static char *get_emulation
116 (int, char **);
117 static bfd_boolean add_archive_element
118 (struct bfd_link_info *, bfd *, const char *);
119 static bfd_boolean multiple_definition
120 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
121 bfd *, asection *, bfd_vma);
122 static bfd_boolean multiple_common
123 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
124 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
125 static bfd_boolean add_to_set
126 (struct bfd_link_info *, struct bfd_link_hash_entry *,
127 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
128 static bfd_boolean constructor_callback
129 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
130 asection *, bfd_vma);
131 static bfd_boolean warning_callback
132 (struct bfd_link_info *, const char *, const char *, bfd *,
133 asection *, bfd_vma);
134 static void warning_find_reloc
135 (bfd *, asection *, void *);
136 static bfd_boolean undefined_symbol
137 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
138 bfd_boolean);
139 static bfd_boolean reloc_overflow
140 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
141 const char *, bfd_vma, bfd *, asection *, bfd_vma);
142 static bfd_boolean reloc_dangerous
143 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
144 static bfd_boolean unattached_reloc
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean notice
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
149 static struct bfd_link_callbacks link_callbacks =
151 add_archive_element,
152 multiple_definition,
153 multiple_common,
154 add_to_set,
155 constructor_callback,
156 warning_callback,
157 undefined_symbol,
158 reloc_overflow,
159 reloc_dangerous,
160 unattached_reloc,
161 notice,
162 einfo,
163 info_msg,
164 minfo,
165 ldlang_override_segment_assignment
168 struct bfd_link_info link_info;
170 static void
171 remove_output (void)
173 if (output_filename)
175 if (link_info.output_bfd)
176 bfd_cache_close (link_info.output_bfd);
177 if (delete_output_file_on_failure)
178 unlink_if_ordinary (output_filename);
183 main (int argc, char **argv)
185 char *emulation;
186 long start_time = get_run_time ();
188 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
189 setlocale (LC_MESSAGES, "");
190 #endif
191 #if defined (HAVE_SETLOCALE)
192 setlocale (LC_CTYPE, "");
193 #endif
194 bindtextdomain (PACKAGE, LOCALEDIR);
195 textdomain (PACKAGE);
197 program_name = argv[0];
198 xmalloc_set_program_name (program_name);
200 START_PROGRESS (program_name, 0);
202 expandargv (&argc, &argv);
204 bfd_init ();
206 bfd_set_error_program_name (program_name);
208 xatexit (remove_output);
210 /* Set up the sysroot directory. */
211 ld_sysroot = get_sysroot (argc, argv);
212 if (*ld_sysroot)
214 if (*TARGET_SYSTEM_ROOT == 0)
216 einfo ("%P%F: this linker was not configured to use sysroots\n");
217 ld_sysroot = "";
219 else
220 ld_canon_sysroot = lrealpath (ld_sysroot);
222 if (ld_canon_sysroot)
223 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
224 else
225 ld_canon_sysroot_len = -1;
227 /* Set the default BFD target based on the configured target. Doing
228 this permits the linker to be configured for a particular target,
229 and linked against a shared BFD library which was configured for
230 a different target. The macro TARGET is defined by Makefile. */
231 if (! bfd_set_default_target (TARGET))
233 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
234 xexit (1);
237 #if YYDEBUG
239 extern int yydebug;
240 yydebug = 1;
242 #endif
244 config.build_constructors = TRUE;
245 config.rpath_separator = ':';
246 config.split_by_reloc = (unsigned) -1;
247 config.split_by_file = (bfd_size_type) -1;
248 config.make_executable = TRUE;
249 config.magic_demand_paged = TRUE;
250 config.text_read_only = TRUE;
252 command_line.warn_mismatch = TRUE;
253 command_line.warn_search_mismatch = TRUE;
254 command_line.check_section_addresses = TRUE;
256 /* We initialize DEMANGLING based on the environment variable
257 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
258 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
259 environment. Acting the same way here lets us provide the same
260 interface by default. */
261 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
263 link_info.allow_undefined_version = TRUE;
264 link_info.keep_memory = TRUE;
265 link_info.combreloc = TRUE;
266 link_info.strip_discarded = TRUE;
267 link_info.emit_hash = TRUE;
268 link_info.callbacks = &link_callbacks;
269 link_info.input_bfds_tail = &link_info.input_bfds;
270 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
271 and _fini symbols. We are compatible. */
272 link_info.init_function = "_init";
273 link_info.fini_function = "_fini";
274 link_info.relax_pass = 1;
275 link_info.pei386_auto_import = -1;
276 link_info.spare_dynamic_tags = 5;
277 link_info.path_separator = ':';
279 ldfile_add_arch ("");
280 emulation = get_emulation (argc, argv);
281 ldemul_choose_mode (emulation);
282 default_target = ldemul_choose_target (argc, argv);
283 lang_init ();
284 ldemul_before_parse ();
285 lang_has_input_file = FALSE;
286 parse_args (argc, argv);
288 if (config.hash_table_size != 0)
289 bfd_hash_set_default_size (config.hash_table_size);
291 ldemul_set_symbols ();
293 if (link_info.relocatable)
295 if (command_line.relax)
296 einfo (_("%P%F: --relax and -r may not be used together\n"));
297 if (link_info.shared)
298 einfo (_("%P%F: -r and -shared may not be used together\n"));
301 /* We may have -Bsymbolic, -Bsymbolic-functions, --dynamic-list-data,
302 --dynamic-list-cpp-new, --dynamic-list-cpp-typeinfo and
303 --dynamic-list FILE. -Bsymbolic and -Bsymbolic-functions are
304 for shared libraries. -Bsymbolic overrides all others and vice
305 versa. */
306 switch (command_line.symbolic)
308 case symbolic_unset:
309 break;
310 case symbolic:
311 /* -Bsymbolic is for shared library only. */
312 if (link_info.shared)
314 link_info.symbolic = TRUE;
315 /* Should we free the unused memory? */
316 link_info.dynamic_list = NULL;
317 command_line.dynamic_list = dynamic_list_unset;
319 break;
320 case symbolic_functions:
321 /* -Bsymbolic-functions is for shared library only. */
322 if (link_info.shared)
323 command_line.dynamic_list = dynamic_list_data;
324 break;
327 switch (command_line.dynamic_list)
329 case dynamic_list_unset:
330 break;
331 case dynamic_list_data:
332 link_info.dynamic_data = TRUE;
333 case dynamic_list:
334 link_info.dynamic = TRUE;
335 break;
338 if (! link_info.shared)
340 if (command_line.filter_shlib)
341 einfo (_("%P%F: -F may not be used without -shared\n"));
342 if (command_line.auxiliary_filters)
343 einfo (_("%P%F: -f may not be used without -shared\n"));
346 if (! link_info.shared || link_info.pie)
347 link_info.executable = TRUE;
349 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
350 don't see how else this can be handled, since in this case we
351 must preserve all externally visible symbols. */
352 if (link_info.relocatable && link_info.strip == strip_all)
354 link_info.strip = strip_debugger;
355 if (link_info.discard == discard_sec_merge)
356 link_info.discard = discard_all;
359 /* If we have not already opened and parsed a linker script,
360 try the default script from command line first. */
361 if (saved_script_handle == NULL
362 && command_line.default_script != NULL)
364 ldfile_open_command_file (command_line.default_script);
365 parser_input = input_script;
366 yyparse ();
369 /* If we have not already opened and parsed a linker script
370 read the emulation's appropriate default script. */
371 if (saved_script_handle == NULL)
373 int isfile;
374 char *s = ldemul_get_script (&isfile);
376 if (isfile)
377 ldfile_open_command_file (s);
378 else
380 lex_string = s;
381 lex_redirect (s);
383 parser_input = input_script;
384 yyparse ();
385 lex_string = NULL;
388 if (trace_file_tries)
390 if (saved_script_handle)
391 info_msg (_("using external linker script:"));
392 else
393 info_msg (_("using internal linker script:"));
394 info_msg ("\n==================================================\n");
396 if (saved_script_handle)
398 static const int ld_bufsz = 8193;
399 size_t n;
400 char *buf = xmalloc (ld_bufsz);
402 rewind (saved_script_handle);
403 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
405 buf[n] = 0;
406 info_msg (buf);
408 rewind (saved_script_handle);
409 free (buf);
411 else
413 int isfile;
415 info_msg (ldemul_get_script (&isfile));
418 info_msg ("\n==================================================\n");
421 lang_final ();
423 if (!lang_has_input_file)
425 if (version_printed)
426 xexit (0);
427 einfo (_("%P%F: no input files\n"));
430 if (trace_files)
431 info_msg (_("%P: mode %s\n"), emulation);
433 ldemul_after_parse ();
435 if (config.map_filename)
437 if (strcmp (config.map_filename, "-") == 0)
439 config.map_file = stdout;
441 else
443 config.map_file = fopen (config.map_filename, FOPEN_WT);
444 if (config.map_file == (FILE *) NULL)
446 bfd_set_error (bfd_error_system_call);
447 einfo (_("%P%F: cannot open map file %s: %E\n"),
448 config.map_filename);
453 lang_process ();
455 /* Print error messages for any missing symbols, for any warning
456 symbols, and possibly multiple definitions. */
457 if (link_info.relocatable)
458 link_info.output_bfd->flags &= ~EXEC_P;
459 else
460 link_info.output_bfd->flags |= EXEC_P;
462 ldwrite ();
464 if (config.map_file != NULL)
465 lang_map ();
466 if (command_line.cref)
467 output_cref (config.map_file != NULL ? config.map_file : stdout);
468 if (nocrossref_list != NULL)
469 check_nocrossrefs ();
471 lang_finish ();
473 /* Even if we're producing relocatable output, some non-fatal errors should
474 be reported in the exit status. (What non-fatal errors, if any, do we
475 want to ignore for relocatable output?) */
476 if (!config.make_executable && !force_make_executable)
478 if (trace_files)
479 einfo (_("%P: link errors found, deleting executable `%s'\n"),
480 output_filename);
482 /* The file will be removed by remove_output. */
483 xexit (1);
485 else
487 if (! bfd_close (link_info.output_bfd))
488 einfo (_("%F%B: final close failed: %E\n"), link_info.output_bfd);
490 /* If the --force-exe-suffix is enabled, and we're making an
491 executable file and it doesn't end in .exe, copy it to one
492 which does. */
493 if (! link_info.relocatable && command_line.force_exe_suffix)
495 int len = strlen (output_filename);
497 if (len < 4
498 || (strcasecmp (output_filename + len - 4, ".exe") != 0
499 && strcasecmp (output_filename + len - 4, ".dll") != 0))
501 FILE *src;
502 FILE *dst;
503 const int bsize = 4096;
504 char *buf = xmalloc (bsize);
505 int l;
506 char *dst_name = xmalloc (len + 5);
508 strcpy (dst_name, output_filename);
509 strcat (dst_name, ".exe");
510 src = fopen (output_filename, FOPEN_RB);
511 dst = fopen (dst_name, FOPEN_WB);
513 if (!src)
514 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
515 output_filename);
516 if (!dst)
517 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
518 dst_name);
519 while ((l = fread (buf, 1, bsize, src)) > 0)
521 int done = fwrite (buf, 1, l, dst);
523 if (done != l)
524 einfo (_("%P: Error writing file `%s'\n"), dst_name);
527 fclose (src);
528 if (fclose (dst) == EOF)
529 einfo (_("%P: Error closing file `%s'\n"), dst_name);
530 free (dst_name);
531 free (buf);
536 END_PROGRESS (program_name);
538 if (config.stats)
540 #ifdef HAVE_SBRK
541 char *lim = sbrk (0);
542 #endif
543 long run_time = get_run_time () - start_time;
545 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
546 program_name, run_time / 1000000, run_time % 1000000);
547 #ifdef HAVE_SBRK
548 fprintf (stderr, _("%s: data size %ld\n"), program_name,
549 (long) (lim - (char *) &environ));
550 #endif
553 /* Prevent remove_output from doing anything, after a successful link. */
554 output_filename = NULL;
556 xexit (0);
557 return 0;
560 /* If the configured sysroot is relocatable, try relocating it based on
561 default prefix FROM. Return the relocated directory if it exists,
562 otherwise return null. */
564 static char *
565 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
567 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
568 char *path;
569 struct stat s;
571 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
572 if (path)
574 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
575 return path;
576 free (path);
578 #endif
579 return 0;
582 /* Return the sysroot directory. Return "" if no sysroot is being used. */
584 static const char *
585 get_sysroot (int argc, char **argv)
587 int i;
588 const char *path;
590 for (i = 1; i < argc; i++)
591 if (CONST_STRNEQ (argv[i], "--sysroot="))
592 return argv[i] + strlen ("--sysroot=");
594 path = get_relative_sysroot (BINDIR);
595 if (path)
596 return path;
598 path = get_relative_sysroot (TOOLBINDIR);
599 if (path)
600 return path;
602 return TARGET_SYSTEM_ROOT;
605 /* We need to find any explicitly given emulation in order to initialize the
606 state that's needed by the lex&yacc argument parser (parse_args). */
608 static char *
609 get_emulation (int argc, char **argv)
611 char *emulation;
612 int i;
614 emulation = getenv (EMULATION_ENVIRON);
615 if (emulation == NULL)
616 emulation = DEFAULT_EMULATION;
618 for (i = 1; i < argc; i++)
620 if (CONST_STRNEQ (argv[i], "-m"))
622 if (argv[i][2] == '\0')
624 /* -m EMUL */
625 if (i < argc - 1)
627 emulation = argv[i + 1];
628 i++;
630 else
631 einfo (_("%P%F: missing argument to -m\n"));
633 else if (strcmp (argv[i], "-mips1") == 0
634 || strcmp (argv[i], "-mips2") == 0
635 || strcmp (argv[i], "-mips3") == 0
636 || strcmp (argv[i], "-mips4") == 0
637 || strcmp (argv[i], "-mips5") == 0
638 || strcmp (argv[i], "-mips32") == 0
639 || strcmp (argv[i], "-mips32r2") == 0
640 || strcmp (argv[i], "-mips64") == 0
641 || strcmp (argv[i], "-mips64r2") == 0)
643 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
644 passed to the linker by some MIPS compilers. They
645 generally tell the linker to use a slightly different
646 library path. Perhaps someday these should be
647 implemented as emulations; until then, we just ignore
648 the arguments and hope that nobody ever creates
649 emulations named ips1, ips2 or ips3. */
651 else if (strcmp (argv[i], "-m486") == 0)
653 /* FIXME: The argument -m486 is passed to the linker on
654 some Linux systems. Hope that nobody creates an
655 emulation named 486. */
657 else
659 /* -mEMUL */
660 emulation = &argv[i][2];
665 return emulation;
668 void
669 add_ysym (const char *name)
671 if (link_info.notice_hash == NULL)
673 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
674 if (!bfd_hash_table_init_n (link_info.notice_hash,
675 bfd_hash_newfunc,
676 sizeof (struct bfd_hash_entry),
677 61))
678 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
681 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
682 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
685 /* Record a symbol to be wrapped, from the --wrap option. */
687 void
688 add_wrap (const char *name)
690 if (link_info.wrap_hash == NULL)
692 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
693 if (!bfd_hash_table_init_n (link_info.wrap_hash,
694 bfd_hash_newfunc,
695 sizeof (struct bfd_hash_entry),
696 61))
697 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
700 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
701 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
704 /* Handle the -retain-symbols-file option. */
706 void
707 add_keepsyms_file (const char *filename)
709 FILE *file;
710 char *buf;
711 size_t bufsize;
712 int c;
714 if (link_info.strip == strip_some)
715 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
717 file = fopen (filename, "r");
718 if (file == NULL)
720 bfd_set_error (bfd_error_system_call);
721 einfo ("%X%P: %s: %E\n", filename);
722 return;
725 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
726 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
727 sizeof (struct bfd_hash_entry)))
728 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
730 bufsize = 100;
731 buf = xmalloc (bufsize);
733 c = getc (file);
734 while (c != EOF)
736 while (ISSPACE (c))
737 c = getc (file);
739 if (c != EOF)
741 size_t len = 0;
743 while (! ISSPACE (c) && c != EOF)
745 buf[len] = c;
746 ++len;
747 if (len >= bufsize)
749 bufsize *= 2;
750 buf = xrealloc (buf, bufsize);
752 c = getc (file);
755 buf[len] = '\0';
757 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
758 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
762 if (link_info.strip != strip_none)
763 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
765 free (buf);
766 link_info.strip = strip_some;
769 /* Callbacks from the BFD linker routines. */
771 /* This is called when BFD has decided to include an archive member in
772 a link. */
774 static bfd_boolean
775 add_archive_element (struct bfd_link_info *info,
776 bfd *abfd,
777 const char *name)
779 lang_input_statement_type *input;
781 input = xcalloc (1, sizeof (lang_input_statement_type));
782 input->filename = abfd->filename;
783 input->local_sym_name = abfd->filename;
784 input->the_bfd = abfd;
786 ldlang_add_file (input);
788 if (config.map_file != NULL)
790 static bfd_boolean header_printed;
791 struct bfd_link_hash_entry *h;
792 bfd *from;
793 int len;
795 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
797 if (h == NULL)
798 from = NULL;
799 else
801 switch (h->type)
803 default:
804 from = NULL;
805 break;
807 case bfd_link_hash_defined:
808 case bfd_link_hash_defweak:
809 from = h->u.def.section->owner;
810 break;
812 case bfd_link_hash_undefined:
813 case bfd_link_hash_undefweak:
814 from = h->u.undef.abfd;
815 break;
817 case bfd_link_hash_common:
818 from = h->u.c.p->section->owner;
819 break;
823 if (! header_printed)
825 char buf[100];
827 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
828 minfo ("%s", buf);
829 header_printed = TRUE;
832 if (bfd_my_archive (abfd) == NULL)
834 minfo ("%s", bfd_get_filename (abfd));
835 len = strlen (bfd_get_filename (abfd));
837 else
839 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
840 bfd_get_filename (abfd));
841 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
842 + strlen (bfd_get_filename (abfd))
843 + 2);
846 if (len >= 29)
848 print_nl ();
849 len = 0;
851 while (len < 30)
853 print_space ();
854 ++len;
857 if (from != NULL)
858 minfo ("%B ", from);
859 if (h != NULL)
860 minfo ("(%T)\n", h->root.string);
861 else
862 minfo ("(%s)\n", name);
865 if (trace_files || trace_file_tries)
866 info_msg ("%I\n", input);
868 return TRUE;
871 /* This is called when BFD has discovered a symbol which is defined
872 multiple times. */
874 static bfd_boolean
875 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
876 const char *name,
877 bfd *obfd,
878 asection *osec,
879 bfd_vma oval,
880 bfd *nbfd,
881 asection *nsec,
882 bfd_vma nval)
884 /* If either section has the output_section field set to
885 bfd_abs_section_ptr, it means that the section is being
886 discarded, and this is not really a multiple definition at all.
887 FIXME: It would be cleaner to somehow ignore symbols defined in
888 sections which are being discarded. */
889 if ((osec->output_section != NULL
890 && ! bfd_is_abs_section (osec)
891 && bfd_is_abs_section (osec->output_section))
892 || (nsec->output_section != NULL
893 && ! bfd_is_abs_section (nsec)
894 && bfd_is_abs_section (nsec->output_section)))
895 return TRUE;
897 einfo (_("%X%C: multiple definition of `%T'\n"),
898 nbfd, nsec, nval, name);
899 if (obfd != NULL)
900 einfo (_("%D: first defined here\n"), obfd, osec, oval);
902 if (command_line.relax)
904 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
905 command_line.relax = 0;
908 return TRUE;
911 /* This is called when there is a definition of a common symbol, or
912 when a common symbol is found for a symbol that is already defined,
913 or when two common symbols are found. We only do something if
914 -warn-common was used. */
916 static bfd_boolean
917 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
918 const char *name,
919 bfd *obfd,
920 enum bfd_link_hash_type otype,
921 bfd_vma osize,
922 bfd *nbfd,
923 enum bfd_link_hash_type ntype,
924 bfd_vma nsize)
926 if (! config.warn_common)
927 return TRUE;
929 if (ntype == bfd_link_hash_defined
930 || ntype == bfd_link_hash_defweak
931 || ntype == bfd_link_hash_indirect)
933 ASSERT (otype == bfd_link_hash_common);
934 einfo (_("%B: warning: definition of `%T' overriding common\n"),
935 nbfd, name);
936 if (obfd != NULL)
937 einfo (_("%B: warning: common is here\n"), obfd);
939 else if (otype == bfd_link_hash_defined
940 || otype == bfd_link_hash_defweak
941 || otype == bfd_link_hash_indirect)
943 ASSERT (ntype == bfd_link_hash_common);
944 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
945 nbfd, name);
946 if (obfd != NULL)
947 einfo (_("%B: warning: defined here\n"), obfd);
949 else
951 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
952 if (osize > nsize)
954 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
955 nbfd, name);
956 if (obfd != NULL)
957 einfo (_("%B: warning: larger common is here\n"), obfd);
959 else if (nsize > osize)
961 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
962 nbfd, name);
963 if (obfd != NULL)
964 einfo (_("%B: warning: smaller common is here\n"), obfd);
966 else
968 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
969 if (obfd != NULL)
970 einfo (_("%B: warning: previous common is here\n"), obfd);
974 return TRUE;
977 /* This is called when BFD has discovered a set element. H is the
978 entry in the linker hash table for the set. SECTION and VALUE
979 represent a value which should be added to the set. */
981 static bfd_boolean
982 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
983 struct bfd_link_hash_entry *h,
984 bfd_reloc_code_real_type reloc,
985 bfd *abfd,
986 asection *section,
987 bfd_vma value)
989 if (config.warn_constructors)
990 einfo (_("%P: warning: global constructor %s used\n"),
991 h->root.string);
993 if (! config.build_constructors)
994 return TRUE;
996 ldctor_add_set_entry (h, reloc, NULL, section, value);
998 if (h->type == bfd_link_hash_new)
1000 h->type = bfd_link_hash_undefined;
1001 h->u.undef.abfd = abfd;
1002 /* We don't call bfd_link_add_undef to add this to the list of
1003 undefined symbols because we are going to define it
1004 ourselves. */
1007 return TRUE;
1010 /* This is called when BFD has discovered a constructor. This is only
1011 called for some object file formats--those which do not handle
1012 constructors in some more clever fashion. This is similar to
1013 adding an element to a set, but less general. */
1015 static bfd_boolean
1016 constructor_callback (struct bfd_link_info *info,
1017 bfd_boolean constructor,
1018 const char *name,
1019 bfd *abfd,
1020 asection *section,
1021 bfd_vma value)
1023 char *s;
1024 struct bfd_link_hash_entry *h;
1025 char set_name[1 + sizeof "__CTOR_LIST__"];
1027 if (config.warn_constructors)
1028 einfo (_("%P: warning: global constructor %s used\n"), name);
1030 if (! config.build_constructors)
1031 return TRUE;
1033 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1034 useful error message. */
1035 if (bfd_reloc_type_lookup (link_info.output_bfd, BFD_RELOC_CTOR) == NULL
1036 && (info->relocatable
1037 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1038 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1040 s = set_name;
1041 if (bfd_get_symbol_leading_char (abfd) != '\0')
1042 *s++ = bfd_get_symbol_leading_char (abfd);
1043 if (constructor)
1044 strcpy (s, "__CTOR_LIST__");
1045 else
1046 strcpy (s, "__DTOR_LIST__");
1048 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1049 if (h == (struct bfd_link_hash_entry *) NULL)
1050 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1051 if (h->type == bfd_link_hash_new)
1053 h->type = bfd_link_hash_undefined;
1054 h->u.undef.abfd = abfd;
1055 /* We don't call bfd_link_add_undef to add this to the list of
1056 undefined symbols because we are going to define it
1057 ourselves. */
1060 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1061 return TRUE;
1064 /* A structure used by warning_callback to pass information through
1065 bfd_map_over_sections. */
1067 struct warning_callback_info
1069 bfd_boolean found;
1070 const char *warning;
1071 const char *symbol;
1072 asymbol **asymbols;
1075 /* This is called when there is a reference to a warning symbol. */
1077 static bfd_boolean
1078 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1079 const char *warning,
1080 const char *symbol,
1081 bfd *abfd,
1082 asection *section,
1083 bfd_vma address)
1085 /* This is a hack to support warn_multiple_gp. FIXME: This should
1086 have a cleaner interface, but what? */
1087 if (! config.warn_multiple_gp
1088 && strcmp (warning, "using multiple gp values") == 0)
1089 return TRUE;
1091 if (section != NULL)
1092 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1093 else if (abfd == NULL)
1094 einfo ("%P: %s%s\n", _("warning: "), warning);
1095 else if (symbol == NULL)
1096 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1097 else
1099 struct warning_callback_info info;
1101 /* Look through the relocs to see if we can find a plausible
1102 address. */
1104 if (!bfd_generic_link_read_symbols (abfd))
1105 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1107 info.found = FALSE;
1108 info.warning = warning;
1109 info.symbol = symbol;
1110 info.asymbols = bfd_get_outsymbols (abfd);
1111 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1113 if (! info.found)
1114 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1117 return TRUE;
1120 /* This is called by warning_callback for each section. It checks the
1121 relocs of the section to see if it can find a reference to the
1122 symbol which triggered the warning. If it can, it uses the reloc
1123 to give an error message with a file and line number. */
1125 static void
1126 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1128 struct warning_callback_info *info = iarg;
1129 long relsize;
1130 arelent **relpp;
1131 long relcount;
1132 arelent **p, **pend;
1134 if (info->found)
1135 return;
1137 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1138 if (relsize < 0)
1139 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1140 if (relsize == 0)
1141 return;
1143 relpp = xmalloc (relsize);
1144 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1145 if (relcount < 0)
1146 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1148 p = relpp;
1149 pend = p + relcount;
1150 for (; p < pend && *p != NULL; p++)
1152 arelent *q = *p;
1154 if (q->sym_ptr_ptr != NULL
1155 && *q->sym_ptr_ptr != NULL
1156 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1158 /* We found a reloc for the symbol we are looking for. */
1159 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1160 info->warning);
1161 info->found = TRUE;
1162 break;
1166 free (relpp);
1169 /* This is called when an undefined symbol is found. */
1171 static bfd_boolean
1172 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1173 const char *name,
1174 bfd *abfd,
1175 asection *section,
1176 bfd_vma address,
1177 bfd_boolean error)
1179 static char *error_name;
1180 static unsigned int error_count;
1182 #define MAX_ERRORS_IN_A_ROW 5
1184 if (config.warn_once)
1186 static struct bfd_hash_table *hash;
1188 /* Only warn once about a particular undefined symbol. */
1189 if (hash == NULL)
1191 hash = xmalloc (sizeof (struct bfd_hash_table));
1192 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1193 sizeof (struct bfd_hash_entry)))
1194 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1197 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1198 return TRUE;
1200 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1201 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1204 /* We never print more than a reasonable number of errors in a row
1205 for a single symbol. */
1206 if (error_name != NULL
1207 && strcmp (name, error_name) == 0)
1208 ++error_count;
1209 else
1211 error_count = 0;
1212 if (error_name != NULL)
1213 free (error_name);
1214 error_name = xstrdup (name);
1217 if (section != NULL)
1219 if (error_count < MAX_ERRORS_IN_A_ROW)
1221 if (error)
1222 einfo (_("%X%C: undefined reference to `%T'\n"),
1223 abfd, section, address, name);
1224 else
1225 einfo (_("%C: warning: undefined reference to `%T'\n"),
1226 abfd, section, address, name);
1228 else if (error_count == MAX_ERRORS_IN_A_ROW)
1230 if (error)
1231 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1232 abfd, section, address, name);
1233 else
1234 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1235 abfd, section, address, name);
1237 else if (error)
1238 einfo ("%X");
1240 else
1242 if (error_count < MAX_ERRORS_IN_A_ROW)
1244 if (error)
1245 einfo (_("%X%B: undefined reference to `%T'\n"),
1246 abfd, name);
1247 else
1248 einfo (_("%B: warning: undefined reference to `%T'\n"),
1249 abfd, name);
1251 else if (error_count == MAX_ERRORS_IN_A_ROW)
1253 if (error)
1254 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1255 abfd, name);
1256 else
1257 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1258 abfd, name);
1260 else if (error)
1261 einfo ("%X");
1264 return TRUE;
1267 /* Counter to limit the number of relocation overflow error messages
1268 to print. Errors are printed as it is decremented. When it's
1269 called and the counter is zero, a final message is printed
1270 indicating more relocations were omitted. When it gets to -1, no
1271 such errors are printed. If it's initially set to a value less
1272 than -1, all such errors will be printed (--verbose does this). */
1274 int overflow_cutoff_limit = 10;
1276 /* This is called when a reloc overflows. */
1278 static bfd_boolean
1279 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1280 struct bfd_link_hash_entry *entry,
1281 const char *name,
1282 const char *reloc_name,
1283 bfd_vma addend,
1284 bfd *abfd,
1285 asection *section,
1286 bfd_vma address)
1288 if (overflow_cutoff_limit == -1)
1289 return TRUE;
1291 einfo ("%X%C:", abfd, section, address);
1293 if (overflow_cutoff_limit >= 0
1294 && overflow_cutoff_limit-- == 0)
1296 einfo (_(" additional relocation overflows omitted from the output\n"));
1297 return TRUE;
1300 if (entry)
1302 while (entry->type == bfd_link_hash_indirect
1303 || entry->type == bfd_link_hash_warning)
1304 entry = entry->u.i.link;
1305 switch (entry->type)
1307 case bfd_link_hash_undefined:
1308 case bfd_link_hash_undefweak:
1309 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1310 reloc_name, entry->root.string);
1311 break;
1312 case bfd_link_hash_defined:
1313 case bfd_link_hash_defweak:
1314 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1315 reloc_name, entry->root.string,
1316 entry->u.def.section,
1317 entry->u.def.section == bfd_abs_section_ptr
1318 ? link_info.output_bfd : entry->u.def.section->owner);
1319 break;
1320 default:
1321 abort ();
1322 break;
1325 else
1326 einfo (_(" relocation truncated to fit: %s against `%T'"),
1327 reloc_name, name);
1328 if (addend != 0)
1329 einfo ("+%v", addend);
1330 einfo ("\n");
1331 return TRUE;
1334 /* This is called when a dangerous relocation is made. */
1336 static bfd_boolean
1337 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1338 const char *message,
1339 bfd *abfd,
1340 asection *section,
1341 bfd_vma address)
1343 einfo (_("%X%C: dangerous relocation: %s\n"),
1344 abfd, section, address, message);
1345 return TRUE;
1348 /* This is called when a reloc is being generated attached to a symbol
1349 that is not being output. */
1351 static bfd_boolean
1352 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1353 const char *name,
1354 bfd *abfd,
1355 asection *section,
1356 bfd_vma address)
1358 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1359 abfd, section, address, name);
1360 return TRUE;
1363 /* This is called if link_info.notice_all is set, or when a symbol in
1364 link_info.notice_hash is found. Symbols are put in notice_hash
1365 using the -y option. */
1367 static bfd_boolean
1368 notice (struct bfd_link_info *info,
1369 const char *name,
1370 bfd *abfd,
1371 asection *section,
1372 bfd_vma value)
1374 if (name == NULL)
1376 if (command_line.cref || nocrossref_list != NULL)
1377 return handle_asneeded_cref (abfd, value);
1378 return TRUE;
1381 if (! info->notice_all
1382 || (info->notice_hash != NULL
1383 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1385 if (bfd_is_und_section (section))
1386 einfo ("%B: reference to %s\n", abfd, name);
1387 else
1388 einfo ("%B: definition of %s\n", abfd, name);
1391 if (command_line.cref || nocrossref_list != NULL)
1392 add_cref (name, abfd, section, value);
1394 return TRUE;