* config.sub, config.guess: Update from upstream sources.
[binutils.git] / ld / ldmain.c
blobdb87a40b6aa74e5fb91d9270e0002735ed5f5b19
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
4 Free Software Foundation, Inc.
5 Written by Steve Chamberlain steve@cygnus.com
7 This file is part of GLD, the Gnu Linker.
9 GLD 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 2, or (at your option)
12 any later version.
14 GLD 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 GLD; see the file COPYING. If not, write to the Free
21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
22 02110-1301, USA. */
24 #include "bfd.h"
25 #include "sysdep.h"
26 #include <stdio.h>
27 #include "safe-ctype.h"
28 #include "libiberty.h"
29 #include "progress.h"
30 #include "bfdlink.h"
31 #include "filenames.h"
33 #include "ld.h"
34 #include "ldmain.h"
35 #include "ldmisc.h"
36 #include "ldwrite.h"
37 #include "ldexp.h"
38 #include "ldlang.h"
39 #include <ldgram.h>
40 #include "ldlex.h"
41 #include "ldfile.h"
42 #include "ldemul.h"
43 #include "ldctor.h"
45 /* Somewhere above, sys/stat.h got included. */
46 #if !defined(S_ISDIR) && defined(S_IFDIR)
47 #define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
48 #endif
50 #include <string.h>
52 #ifdef HAVE_SBRK
53 #if !HAVE_DECL_SBRK
54 extern void *sbrk ();
55 #endif
56 #endif
58 #ifndef TARGET_SYSTEM_ROOT
59 #define TARGET_SYSTEM_ROOT ""
60 #endif
62 /* EXPORTS */
64 char *default_target;
65 const char *output_filename = "a.out";
67 /* Name this program was invoked by. */
68 char *program_name;
70 /* The prefix for system library directories. */
71 const char *ld_sysroot;
73 /* The canonical representation of ld_sysroot. */
74 char * ld_canon_sysroot;
75 int ld_canon_sysroot_len;
77 /* The file that we're creating. */
78 bfd *output_bfd = 0;
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 void set_scripts_dir
118 (void);
119 static bfd_boolean add_archive_element
120 (struct bfd_link_info *, bfd *, const char *);
121 static bfd_boolean multiple_definition
122 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
123 bfd *, asection *, bfd_vma);
124 static bfd_boolean multiple_common
125 (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
126 bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
127 static bfd_boolean add_to_set
128 (struct bfd_link_info *, struct bfd_link_hash_entry *,
129 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
130 static bfd_boolean constructor_callback
131 (struct bfd_link_info *, bfd_boolean, const char *, bfd *,
132 asection *, bfd_vma);
133 static bfd_boolean warning_callback
134 (struct bfd_link_info *, const char *, const char *, bfd *,
135 asection *, bfd_vma);
136 static void warning_find_reloc
137 (bfd *, asection *, void *);
138 static bfd_boolean undefined_symbol
139 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
140 bfd_boolean);
141 static bfd_boolean reloc_overflow
142 (struct bfd_link_info *, struct bfd_link_hash_entry *, const char *,
143 const char *, bfd_vma, bfd *, asection *, bfd_vma);
144 static bfd_boolean reloc_dangerous
145 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
146 static bfd_boolean unattached_reloc
147 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
148 static bfd_boolean notice
149 (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
151 static struct bfd_link_callbacks link_callbacks =
153 add_archive_element,
154 multiple_definition,
155 multiple_common,
156 add_to_set,
157 constructor_callback,
158 warning_callback,
159 undefined_symbol,
160 reloc_overflow,
161 reloc_dangerous,
162 unattached_reloc,
163 notice,
164 einfo
167 struct bfd_link_info link_info;
169 static void
170 remove_output (void)
172 if (output_filename)
174 if (output_bfd)
175 bfd_cache_close (output_bfd);
176 if (delete_output_file_on_failure)
177 unlink_if_ordinary (output_filename);
182 main (int argc, char **argv)
184 char *emulation;
185 long start_time = get_run_time ();
187 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
188 setlocale (LC_MESSAGES, "");
189 #endif
190 #if defined (HAVE_SETLOCALE)
191 setlocale (LC_CTYPE, "");
192 #endif
193 bindtextdomain (PACKAGE, LOCALEDIR);
194 textdomain (PACKAGE);
196 program_name = argv[0];
197 xmalloc_set_program_name (program_name);
199 START_PROGRESS (program_name, 0);
201 expandargv (&argc, &argv);
203 bfd_init ();
205 bfd_set_error_program_name (program_name);
207 xatexit (remove_output);
209 /* Set up the sysroot directory. */
210 ld_sysroot = get_sysroot (argc, argv);
211 if (*ld_sysroot)
213 if (*TARGET_SYSTEM_ROOT == 0)
215 einfo ("%P%F: this linker was not configured to use sysroots\n");
216 ld_sysroot = "";
218 else
219 ld_canon_sysroot = lrealpath (ld_sysroot);
221 if (ld_canon_sysroot)
222 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
223 else
224 ld_canon_sysroot_len = -1;
226 /* Set the default BFD target based on the configured target. Doing
227 this permits the linker to be configured for a particular target,
228 and linked against a shared BFD library which was configured for
229 a different target. The macro TARGET is defined by Makefile. */
230 if (! bfd_set_default_target (TARGET))
232 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
233 xexit (1);
236 #if YYDEBUG
238 extern int yydebug;
239 yydebug = 1;
241 #endif
243 /* Initialize the data about options. */
244 trace_files = trace_file_tries = version_printed = FALSE;
245 whole_archive = FALSE;
246 config.build_constructors = TRUE;
247 config.dynamic_link = FALSE;
248 config.has_shared = FALSE;
249 config.split_by_reloc = (unsigned) -1;
250 config.split_by_file = (bfd_size_type) -1;
251 config.hash_table_size = 0;
252 command_line.force_common_definition = FALSE;
253 command_line.inhibit_common_definition = FALSE;
254 command_line.interpreter = NULL;
255 command_line.rpath = NULL;
256 command_line.warn_mismatch = TRUE;
257 command_line.check_section_addresses = TRUE;
258 command_line.accept_unknown_input_arch = FALSE;
259 command_line.reduce_memory_overheads = FALSE;
261 sort_section = none;
263 /* We initialize DEMANGLING based on the environment variable
264 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
265 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
266 environment. Acting the same way here lets us provide the same
267 interface by default. */
268 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
270 link_info.relocatable = FALSE;
271 link_info.emitrelocations = FALSE;
272 link_info.task_link = FALSE;
273 link_info.shared = FALSE;
274 link_info.pie = FALSE;
275 link_info.executable = FALSE;
276 link_info.symbolic = FALSE;
277 link_info.export_dynamic = FALSE;
278 link_info.static_link = FALSE;
279 link_info.traditional_format = FALSE;
280 link_info.optimize = FALSE;
281 link_info.unresolved_syms_in_objects = RM_NOT_YET_SET;
282 link_info.unresolved_syms_in_shared_libs = RM_NOT_YET_SET;
283 link_info.allow_multiple_definition = FALSE;
284 link_info.allow_undefined_version = TRUE;
285 link_info.create_default_symver = FALSE;
286 link_info.default_imported_symver = FALSE;
287 link_info.keep_memory = TRUE;
288 link_info.notice_all = FALSE;
289 link_info.nocopyreloc = FALSE;
290 link_info.new_dtags = FALSE;
291 link_info.combreloc = TRUE;
292 link_info.eh_frame_hdr = FALSE;
293 link_info.relro = FALSE;
294 link_info.strip_discarded = TRUE;
295 link_info.strip = strip_none;
296 link_info.discard = discard_sec_merge;
297 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
298 link_info.callbacks = &link_callbacks;
299 link_info.hash = NULL;
300 link_info.keep_hash = NULL;
301 link_info.notice_hash = NULL;
302 link_info.wrap_hash = NULL;
303 link_info.input_bfds = NULL;
304 link_info.create_object_symbols_section = NULL;
305 link_info.gc_sym_list = NULL;
306 link_info.base_file = NULL;
307 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
308 and _fini symbols. We are compatible. */
309 link_info.init_function = "_init";
310 link_info.fini_function = "_fini";
311 link_info.pei386_auto_import = -1;
312 link_info.pei386_runtime_pseudo_reloc = FALSE;
313 link_info.spare_dynamic_tags = 5;
314 link_info.flags = 0;
315 link_info.flags_1 = 0;
316 link_info.relax_pass = 1;
317 link_info.warn_shared_textrel = FALSE;
318 link_info.gc_sections = FALSE;
320 ldfile_add_arch ("");
322 config.make_executable = TRUE;
323 force_make_executable = FALSE;
324 config.magic_demand_paged = TRUE;
325 config.text_read_only = TRUE;
327 emulation = get_emulation (argc, argv);
328 ldemul_choose_mode (emulation);
329 default_target = ldemul_choose_target (argc, argv);
330 lang_init ();
331 ldemul_before_parse ();
332 lang_has_input_file = FALSE;
333 parse_args (argc, argv);
335 if (config.hash_table_size != 0)
336 bfd_hash_set_default_size (config.hash_table_size);
338 ldemul_set_symbols ();
340 if (link_info.relocatable)
342 if (link_info.gc_sections)
343 einfo ("%P%F: --gc-sections and -r may not be used together\n");
344 else if (command_line.relax)
345 einfo (_("%P%F: --relax and -r may not be used together\n"));
346 if (link_info.shared)
347 einfo (_("%P%F: -r and -shared may not be used together\n"));
350 if (! link_info.shared)
352 if (command_line.filter_shlib)
353 einfo (_("%P%F: -F may not be used without -shared\n"));
354 if (command_line.auxiliary_filters)
355 einfo (_("%P%F: -f may not be used without -shared\n"));
358 if (! link_info.shared || link_info.pie)
359 link_info.executable = TRUE;
361 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
362 don't see how else this can be handled, since in this case we
363 must preserve all externally visible symbols. */
364 if (link_info.relocatable && link_info.strip == strip_all)
366 link_info.strip = strip_debugger;
367 if (link_info.discard == discard_sec_merge)
368 link_info.discard = discard_all;
371 /* This essentially adds another -L directory so this must be done after
372 the -L's in argv have been processed. */
373 set_scripts_dir ();
375 /* If we have not already opened and parsed a linker script
376 read the emulation's appropriate default script. */
377 if (saved_script_handle == NULL)
379 int isfile;
380 char *s = ldemul_get_script (&isfile);
382 if (isfile)
383 ldfile_open_command_file (s);
384 else
386 lex_string = s;
387 lex_redirect (s);
389 parser_input = input_script;
390 yyparse ();
391 lex_string = NULL;
394 if (trace_file_tries)
396 if (saved_script_handle)
397 info_msg (_("using external linker script:"));
398 else
399 info_msg (_("using internal linker script:"));
400 info_msg ("\n==================================================\n");
402 if (saved_script_handle)
404 static const int ld_bufsz = 8193;
405 size_t n;
406 char *buf = xmalloc (ld_bufsz);
408 rewind (saved_script_handle);
409 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
411 buf[n] = 0;
412 info_msg (buf);
414 rewind (saved_script_handle);
415 free (buf);
417 else
419 int isfile;
421 info_msg (ldemul_get_script (&isfile));
424 info_msg ("\n==================================================\n");
427 lang_final ();
429 if (!lang_has_input_file)
431 if (version_printed)
432 xexit (0);
433 einfo (_("%P%F: no input files\n"));
436 if (trace_files)
437 info_msg (_("%P: mode %s\n"), emulation);
439 ldemul_after_parse ();
441 if (config.map_filename)
443 if (strcmp (config.map_filename, "-") == 0)
445 config.map_file = stdout;
447 else
449 config.map_file = fopen (config.map_filename, FOPEN_WT);
450 if (config.map_file == (FILE *) NULL)
452 bfd_set_error (bfd_error_system_call);
453 einfo (_("%P%F: cannot open map file %s: %E\n"),
454 config.map_filename);
459 lang_process ();
461 /* Print error messages for any missing symbols, for any warning
462 symbols, and possibly multiple definitions. */
463 if (link_info.relocatable)
464 output_bfd->flags &= ~EXEC_P;
465 else
466 output_bfd->flags |= EXEC_P;
468 ldwrite ();
470 if (config.map_file != NULL)
471 lang_map ();
472 if (command_line.cref)
473 output_cref (config.map_file != NULL ? config.map_file : stdout);
474 if (nocrossref_list != NULL)
475 check_nocrossrefs ();
477 lang_finish ();
479 /* Even if we're producing relocatable output, some non-fatal errors should
480 be reported in the exit status. (What non-fatal errors, if any, do we
481 want to ignore for relocatable output?) */
482 if (!config.make_executable && !force_make_executable)
484 if (trace_files)
485 einfo (_("%P: link errors found, deleting executable `%s'\n"),
486 output_filename);
488 /* The file will be removed by remove_output. */
489 xexit (1);
491 else
493 if (! bfd_close (output_bfd))
494 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
496 /* If the --force-exe-suffix is enabled, and we're making an
497 executable file and it doesn't end in .exe, copy it to one
498 which does. */
499 if (! link_info.relocatable && command_line.force_exe_suffix)
501 int len = strlen (output_filename);
503 if (len < 4
504 || (strcasecmp (output_filename + len - 4, ".exe") != 0
505 && strcasecmp (output_filename + len - 4, ".dll") != 0))
507 FILE *src;
508 FILE *dst;
509 const int bsize = 4096;
510 char *buf = xmalloc (bsize);
511 int l;
512 char *dst_name = xmalloc (len + 5);
514 strcpy (dst_name, output_filename);
515 strcat (dst_name, ".exe");
516 src = fopen (output_filename, FOPEN_RB);
517 dst = fopen (dst_name, FOPEN_WB);
519 if (!src)
520 einfo (_("%X%P: unable to open for source of copy `%s'\n"),
521 output_filename);
522 if (!dst)
523 einfo (_("%X%P: unable to open for destination of copy `%s'\n"),
524 dst_name);
525 while ((l = fread (buf, 1, bsize, src)) > 0)
527 int done = fwrite (buf, 1, l, dst);
529 if (done != l)
530 einfo (_("%P: Error writing file `%s'\n"), dst_name);
533 fclose (src);
534 if (fclose (dst) == EOF)
535 einfo (_("%P: Error closing file `%s'\n"), dst_name);
536 free (dst_name);
537 free (buf);
542 END_PROGRESS (program_name);
544 if (config.stats)
546 #ifdef HAVE_SBRK
547 char *lim = sbrk (0);
548 #endif
549 long run_time = get_run_time () - start_time;
551 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
552 program_name, run_time / 1000000, run_time % 1000000);
553 #ifdef HAVE_SBRK
554 fprintf (stderr, _("%s: data size %ld\n"), program_name,
555 (long) (lim - (char *) &environ));
556 #endif
559 /* Prevent remove_output from doing anything, after a successful link. */
560 output_filename = NULL;
562 xexit (0);
563 return 0;
566 /* If the configured sysroot is relocatable, try relocating it based on
567 default prefix FROM. Return the relocated directory if it exists,
568 otherwise return null. */
570 static char *
571 get_relative_sysroot (const char *from ATTRIBUTE_UNUSED)
573 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
574 char *path;
575 struct stat s;
577 path = make_relative_prefix (program_name, from, TARGET_SYSTEM_ROOT);
578 if (path)
580 if (stat (path, &s) == 0 && S_ISDIR (s.st_mode))
581 return path;
582 free (path);
584 #endif
585 return 0;
588 /* Return the sysroot directory. Return "" if no sysroot is being used. */
590 static const char *
591 get_sysroot (int argc, char **argv)
593 int i;
594 const char *path;
596 for (i = 1; i < argc; i++)
597 if (strncmp (argv[i], "--sysroot=", strlen ("--sysroot=")) == 0)
598 return argv[i] + strlen ("--sysroot=");
600 path = get_relative_sysroot (BINDIR);
601 if (path)
602 return path;
604 path = get_relative_sysroot (TOOLBINDIR);
605 if (path)
606 return path;
608 return TARGET_SYSTEM_ROOT;
611 /* We need to find any explicitly given emulation in order to initialize the
612 state that's needed by the lex&yacc argument parser (parse_args). */
614 static char *
615 get_emulation (int argc, char **argv)
617 char *emulation;
618 int i;
620 emulation = getenv (EMULATION_ENVIRON);
621 if (emulation == NULL)
622 emulation = DEFAULT_EMULATION;
624 for (i = 1; i < argc; i++)
626 if (!strncmp (argv[i], "-m", 2))
628 if (argv[i][2] == '\0')
630 /* -m EMUL */
631 if (i < argc - 1)
633 emulation = argv[i + 1];
634 i++;
636 else
637 einfo (_("%P%F: missing argument to -m\n"));
639 else if (strcmp (argv[i], "-mips1") == 0
640 || strcmp (argv[i], "-mips2") == 0
641 || strcmp (argv[i], "-mips3") == 0
642 || strcmp (argv[i], "-mips4") == 0
643 || strcmp (argv[i], "-mips5") == 0
644 || strcmp (argv[i], "-mips32") == 0
645 || strcmp (argv[i], "-mips32r2") == 0
646 || strcmp (argv[i], "-mips64") == 0
647 || strcmp (argv[i], "-mips64r2") == 0)
649 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
650 passed to the linker by some MIPS compilers. They
651 generally tell the linker to use a slightly different
652 library path. Perhaps someday these should be
653 implemented as emulations; until then, we just ignore
654 the arguments and hope that nobody ever creates
655 emulations named ips1, ips2 or ips3. */
657 else if (strcmp (argv[i], "-m486") == 0)
659 /* FIXME: The argument -m486 is passed to the linker on
660 some Linux systems. Hope that nobody creates an
661 emulation named 486. */
663 else
665 /* -mEMUL */
666 emulation = &argv[i][2];
671 return emulation;
674 /* If directory DIR contains an "ldscripts" subdirectory,
675 add DIR to the library search path and return TRUE,
676 else return FALSE. */
678 static bfd_boolean
679 check_for_scripts_dir (char *dir)
681 size_t dirlen;
682 char *buf;
683 struct stat s;
684 bfd_boolean res;
686 dirlen = strlen (dir);
687 /* sizeof counts the terminating NUL. */
688 buf = xmalloc (dirlen + sizeof ("/ldscripts"));
689 sprintf (buf, "%s/ldscripts", dir);
691 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
692 free (buf);
693 if (res)
694 ldfile_add_library_path (dir, FALSE);
695 return res;
698 /* Set the default directory for finding script files.
699 Libraries will be searched for here too, but that's ok.
700 We look for the "ldscripts" directory in:
702 SCRIPTDIR (passed from Makefile)
703 (adjusted according to the current location of the binary)
704 SCRIPTDIR (passed from Makefile)
705 the dir where this program is (for using it from the build tree)
706 the dir where this program is/../lib
707 (for installing the tool suite elsewhere). */
709 static void
710 set_scripts_dir (void)
712 char *end, *dir;
713 size_t dirlen;
714 bfd_boolean found;
716 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
717 if (dir)
719 found = check_for_scripts_dir (dir);
720 free (dir);
721 if (found)
722 return;
725 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
726 if (dir)
728 found = check_for_scripts_dir (dir);
729 free (dir);
730 if (found)
731 return;
734 if (check_for_scripts_dir (SCRIPTDIR))
735 /* We've been installed normally. */
736 return;
738 /* Look for "ldscripts" in the dir where our binary is. */
739 end = strrchr (program_name, '/');
740 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
742 /* We could have \foo\bar, or /foo\bar. */
743 char *bslash = strrchr (program_name, '\\');
745 if (end == NULL || (bslash != NULL && bslash > end))
746 end = bslash;
748 #endif
750 if (end == NULL)
751 /* Don't look for ldscripts in the current directory. There is
752 too much potential for confusion. */
753 return;
755 dirlen = end - program_name;
756 /* Make a copy of program_name in dir.
757 Leave room for later "/../lib". */
758 dir = xmalloc (dirlen + 8);
759 strncpy (dir, program_name, dirlen);
760 dir[dirlen] = '\0';
762 if (check_for_scripts_dir (dir))
764 free (dir);
765 return;
768 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
769 strcpy (dir + dirlen, "/../lib");
770 check_for_scripts_dir (dir);
771 free (dir);
774 void
775 add_ysym (const char *name)
777 if (link_info.notice_hash == NULL)
779 link_info.notice_hash = xmalloc (sizeof (struct bfd_hash_table));
780 if (!bfd_hash_table_init_n (link_info.notice_hash,
781 bfd_hash_newfunc,
782 sizeof (struct bfd_hash_entry),
783 61))
784 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
787 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE) == NULL)
788 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
791 /* Record a symbol to be wrapped, from the --wrap option. */
793 void
794 add_wrap (const char *name)
796 if (link_info.wrap_hash == NULL)
798 link_info.wrap_hash = xmalloc (sizeof (struct bfd_hash_table));
799 if (!bfd_hash_table_init_n (link_info.wrap_hash,
800 bfd_hash_newfunc,
801 sizeof (struct bfd_hash_entry),
802 61))
803 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
806 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
807 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
810 /* Handle the -retain-symbols-file option. */
812 void
813 add_keepsyms_file (const char *filename)
815 FILE *file;
816 char *buf;
817 size_t bufsize;
818 int c;
820 if (link_info.strip == strip_some)
821 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
823 file = fopen (filename, "r");
824 if (file == NULL)
826 bfd_set_error (bfd_error_system_call);
827 einfo ("%X%P: %s: %E\n", filename);
828 return;
831 link_info.keep_hash = xmalloc (sizeof (struct bfd_hash_table));
832 if (!bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc,
833 sizeof (struct bfd_hash_entry)))
834 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
836 bufsize = 100;
837 buf = xmalloc (bufsize);
839 c = getc (file);
840 while (c != EOF)
842 while (ISSPACE (c))
843 c = getc (file);
845 if (c != EOF)
847 size_t len = 0;
849 while (! ISSPACE (c) && c != EOF)
851 buf[len] = c;
852 ++len;
853 if (len >= bufsize)
855 bufsize *= 2;
856 buf = xrealloc (buf, bufsize);
858 c = getc (file);
861 buf[len] = '\0';
863 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE) == NULL)
864 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
868 if (link_info.strip != strip_none)
869 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
871 free (buf);
872 link_info.strip = strip_some;
875 /* Callbacks from the BFD linker routines. */
877 /* This is called when BFD has decided to include an archive member in
878 a link. */
880 static bfd_boolean
881 add_archive_element (struct bfd_link_info *info,
882 bfd *abfd,
883 const char *name)
885 lang_input_statement_type *input;
887 input = xmalloc (sizeof (lang_input_statement_type));
888 input->filename = abfd->filename;
889 input->local_sym_name = abfd->filename;
890 input->the_bfd = abfd;
891 input->asymbols = NULL;
892 input->next = NULL;
893 input->just_syms_flag = FALSE;
894 input->loaded = FALSE;
895 input->search_dirs_flag = FALSE;
897 /* FIXME: The following fields are not set: header.next,
898 header.type, closed, passive_position, symbol_count,
899 next_real_file, is_archive, target, real. This bit of code is
900 from the old decode_library_subfile function. I don't know
901 whether any of those fields matters. */
903 ldlang_add_file (input);
905 if (config.map_file != NULL)
907 static bfd_boolean header_printed;
908 struct bfd_link_hash_entry *h;
909 bfd *from;
910 int len;
912 h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
914 if (h == NULL)
915 from = NULL;
916 else
918 switch (h->type)
920 default:
921 from = NULL;
922 break;
924 case bfd_link_hash_defined:
925 case bfd_link_hash_defweak:
926 from = h->u.def.section->owner;
927 break;
929 case bfd_link_hash_undefined:
930 case bfd_link_hash_undefweak:
931 from = h->u.undef.abfd;
932 break;
934 case bfd_link_hash_common:
935 from = h->u.c.p->section->owner;
936 break;
940 if (! header_printed)
942 char buf[100];
944 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
945 minfo ("%s", buf);
946 header_printed = TRUE;
949 if (bfd_my_archive (abfd) == NULL)
951 minfo ("%s", bfd_get_filename (abfd));
952 len = strlen (bfd_get_filename (abfd));
954 else
956 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
957 bfd_get_filename (abfd));
958 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
959 + strlen (bfd_get_filename (abfd))
960 + 2);
963 if (len >= 29)
965 print_nl ();
966 len = 0;
968 while (len < 30)
970 print_space ();
971 ++len;
974 if (from != NULL)
975 minfo ("%B ", from);
976 if (h != NULL)
977 minfo ("(%T)\n", h->root.string);
978 else
979 minfo ("(%s)\n", name);
982 if (trace_files || trace_file_tries)
983 info_msg ("%I\n", input);
985 return TRUE;
988 /* This is called when BFD has discovered a symbol which is defined
989 multiple times. */
991 static bfd_boolean
992 multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
993 const char *name,
994 bfd *obfd,
995 asection *osec,
996 bfd_vma oval,
997 bfd *nbfd,
998 asection *nsec,
999 bfd_vma nval)
1001 /* If either section has the output_section field set to
1002 bfd_abs_section_ptr, it means that the section is being
1003 discarded, and this is not really a multiple definition at all.
1004 FIXME: It would be cleaner to somehow ignore symbols defined in
1005 sections which are being discarded. */
1006 if ((osec->output_section != NULL
1007 && ! bfd_is_abs_section (osec)
1008 && bfd_is_abs_section (osec->output_section))
1009 || (nsec->output_section != NULL
1010 && ! bfd_is_abs_section (nsec)
1011 && bfd_is_abs_section (nsec->output_section)))
1012 return TRUE;
1014 einfo (_("%X%C: multiple definition of `%T'\n"),
1015 nbfd, nsec, nval, name);
1016 if (obfd != NULL)
1017 einfo (_("%D: first defined here\n"), obfd, osec, oval);
1019 if (command_line.relax)
1021 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
1022 command_line.relax = 0;
1025 return TRUE;
1028 /* This is called when there is a definition of a common symbol, or
1029 when a common symbol is found for a symbol that is already defined,
1030 or when two common symbols are found. We only do something if
1031 -warn-common was used. */
1033 static bfd_boolean
1034 multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1035 const char *name,
1036 bfd *obfd,
1037 enum bfd_link_hash_type otype,
1038 bfd_vma osize,
1039 bfd *nbfd,
1040 enum bfd_link_hash_type ntype,
1041 bfd_vma nsize)
1043 if (! config.warn_common)
1044 return TRUE;
1046 if (ntype == bfd_link_hash_defined
1047 || ntype == bfd_link_hash_defweak
1048 || ntype == bfd_link_hash_indirect)
1050 ASSERT (otype == bfd_link_hash_common);
1051 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1052 nbfd, name);
1053 if (obfd != NULL)
1054 einfo (_("%B: warning: common is here\n"), obfd);
1056 else if (otype == bfd_link_hash_defined
1057 || otype == bfd_link_hash_defweak
1058 || otype == bfd_link_hash_indirect)
1060 ASSERT (ntype == bfd_link_hash_common);
1061 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1062 nbfd, name);
1063 if (obfd != NULL)
1064 einfo (_("%B: warning: defined here\n"), obfd);
1066 else
1068 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1069 if (osize > nsize)
1071 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1072 nbfd, name);
1073 if (obfd != NULL)
1074 einfo (_("%B: warning: larger common is here\n"), obfd);
1076 else if (nsize > osize)
1078 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1079 nbfd, name);
1080 if (obfd != NULL)
1081 einfo (_("%B: warning: smaller common is here\n"), obfd);
1083 else
1085 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1086 if (obfd != NULL)
1087 einfo (_("%B: warning: previous common is here\n"), obfd);
1091 return TRUE;
1094 /* This is called when BFD has discovered a set element. H is the
1095 entry in the linker hash table for the set. SECTION and VALUE
1096 represent a value which should be added to the set. */
1098 static bfd_boolean
1099 add_to_set (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1100 struct bfd_link_hash_entry *h,
1101 bfd_reloc_code_real_type reloc,
1102 bfd *abfd,
1103 asection *section,
1104 bfd_vma value)
1106 if (config.warn_constructors)
1107 einfo (_("%P: warning: global constructor %s used\n"),
1108 h->root.string);
1110 if (! config.build_constructors)
1111 return TRUE;
1113 ldctor_add_set_entry (h, reloc, NULL, section, value);
1115 if (h->type == bfd_link_hash_new)
1117 h->type = bfd_link_hash_undefined;
1118 h->u.undef.abfd = abfd;
1119 /* We don't call bfd_link_add_undef to add this to the list of
1120 undefined symbols because we are going to define it
1121 ourselves. */
1124 return TRUE;
1127 /* This is called when BFD has discovered a constructor. This is only
1128 called for some object file formats--those which do not handle
1129 constructors in some more clever fashion. This is similar to
1130 adding an element to a set, but less general. */
1132 static bfd_boolean
1133 constructor_callback (struct bfd_link_info *info,
1134 bfd_boolean constructor,
1135 const char *name,
1136 bfd *abfd,
1137 asection *section,
1138 bfd_vma value)
1140 char *s;
1141 struct bfd_link_hash_entry *h;
1142 char set_name[1 + sizeof "__CTOR_LIST__"];
1144 if (config.warn_constructors)
1145 einfo (_("%P: warning: global constructor %s used\n"), name);
1147 if (! config.build_constructors)
1148 return TRUE;
1150 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1151 useful error message. */
1152 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1153 && (info->relocatable
1154 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1155 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1157 s = set_name;
1158 if (bfd_get_symbol_leading_char (abfd) != '\0')
1159 *s++ = bfd_get_symbol_leading_char (abfd);
1160 if (constructor)
1161 strcpy (s, "__CTOR_LIST__");
1162 else
1163 strcpy (s, "__DTOR_LIST__");
1165 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1166 if (h == (struct bfd_link_hash_entry *) NULL)
1167 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1168 if (h->type == bfd_link_hash_new)
1170 h->type = bfd_link_hash_undefined;
1171 h->u.undef.abfd = abfd;
1172 /* We don't call bfd_link_add_undef to add this to the list of
1173 undefined symbols because we are going to define it
1174 ourselves. */
1177 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1178 return TRUE;
1181 /* A structure used by warning_callback to pass information through
1182 bfd_map_over_sections. */
1184 struct warning_callback_info
1186 bfd_boolean found;
1187 const char *warning;
1188 const char *symbol;
1189 asymbol **asymbols;
1192 /* This is called when there is a reference to a warning symbol. */
1194 static bfd_boolean
1195 warning_callback (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1196 const char *warning,
1197 const char *symbol,
1198 bfd *abfd,
1199 asection *section,
1200 bfd_vma address)
1202 /* This is a hack to support warn_multiple_gp. FIXME: This should
1203 have a cleaner interface, but what? */
1204 if (! config.warn_multiple_gp
1205 && strcmp (warning, "using multiple gp values") == 0)
1206 return TRUE;
1208 if (section != NULL)
1209 einfo ("%C: %s%s\n", abfd, section, address, _("warning: "), warning);
1210 else if (abfd == NULL)
1211 einfo ("%P: %s%s\n", _("warning: "), warning);
1212 else if (symbol == NULL)
1213 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1214 else
1216 lang_input_statement_type *entry;
1217 asymbol **asymbols;
1218 struct warning_callback_info info;
1220 /* Look through the relocs to see if we can find a plausible
1221 address. */
1222 entry = (lang_input_statement_type *) abfd->usrdata;
1223 if (entry != NULL && entry->asymbols != NULL)
1224 asymbols = entry->asymbols;
1225 else
1227 long symsize;
1228 long symbol_count;
1230 symsize = bfd_get_symtab_upper_bound (abfd);
1231 if (symsize < 0)
1232 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1233 asymbols = xmalloc (symsize);
1234 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1235 if (symbol_count < 0)
1236 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1237 if (entry != NULL)
1239 entry->asymbols = asymbols;
1240 entry->symbol_count = symbol_count;
1244 info.found = FALSE;
1245 info.warning = warning;
1246 info.symbol = symbol;
1247 info.asymbols = asymbols;
1248 bfd_map_over_sections (abfd, warning_find_reloc, &info);
1250 if (! info.found)
1251 einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
1253 if (entry == NULL)
1254 free (asymbols);
1257 return TRUE;
1260 /* This is called by warning_callback for each section. It checks the
1261 relocs of the section to see if it can find a reference to the
1262 symbol which triggered the warning. If it can, it uses the reloc
1263 to give an error message with a file and line number. */
1265 static void
1266 warning_find_reloc (bfd *abfd, asection *sec, void *iarg)
1268 struct warning_callback_info *info = iarg;
1269 long relsize;
1270 arelent **relpp;
1271 long relcount;
1272 arelent **p, **pend;
1274 if (info->found)
1275 return;
1277 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1278 if (relsize < 0)
1279 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1280 if (relsize == 0)
1281 return;
1283 relpp = xmalloc (relsize);
1284 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1285 if (relcount < 0)
1286 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1288 p = relpp;
1289 pend = p + relcount;
1290 for (; p < pend && *p != NULL; p++)
1292 arelent *q = *p;
1294 if (q->sym_ptr_ptr != NULL
1295 && *q->sym_ptr_ptr != NULL
1296 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1298 /* We found a reloc for the symbol we are looking for. */
1299 einfo ("%C: %s%s\n", abfd, sec, q->address, _("warning: "),
1300 info->warning);
1301 info->found = TRUE;
1302 break;
1306 free (relpp);
1309 /* This is called when an undefined symbol is found. */
1311 static bfd_boolean
1312 undefined_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1313 const char *name,
1314 bfd *abfd,
1315 asection *section,
1316 bfd_vma address,
1317 bfd_boolean error)
1319 static char *error_name;
1320 static unsigned int error_count;
1322 #define MAX_ERRORS_IN_A_ROW 5
1324 if (config.warn_once)
1326 static struct bfd_hash_table *hash;
1328 /* Only warn once about a particular undefined symbol. */
1329 if (hash == NULL)
1331 hash = xmalloc (sizeof (struct bfd_hash_table));
1332 if (!bfd_hash_table_init (hash, bfd_hash_newfunc,
1333 sizeof (struct bfd_hash_entry)))
1334 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1337 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1338 return TRUE;
1340 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1341 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1344 /* We never print more than a reasonable number of errors in a row
1345 for a single symbol. */
1346 if (error_name != NULL
1347 && strcmp (name, error_name) == 0)
1348 ++error_count;
1349 else
1351 error_count = 0;
1352 if (error_name != NULL)
1353 free (error_name);
1354 error_name = xstrdup (name);
1357 if (section != NULL)
1359 if (error_count < MAX_ERRORS_IN_A_ROW)
1361 if (error)
1362 einfo (_("%X%C: undefined reference to `%T'\n"),
1363 abfd, section, address, name);
1364 else
1365 einfo (_("%C: warning: undefined reference to `%T'\n"),
1366 abfd, section, address, name);
1368 else if (error_count == MAX_ERRORS_IN_A_ROW)
1370 if (error)
1371 einfo (_("%X%D: more undefined references to `%T' follow\n"),
1372 abfd, section, address, name);
1373 else
1374 einfo (_("%D: warning: more undefined references to `%T' follow\n"),
1375 abfd, section, address, name);
1377 else if (error)
1378 einfo ("%X");
1380 else
1382 if (error_count < MAX_ERRORS_IN_A_ROW)
1384 if (error)
1385 einfo (_("%X%B: undefined reference to `%T'\n"),
1386 abfd, name);
1387 else
1388 einfo (_("%B: warning: undefined reference to `%T'\n"),
1389 abfd, name);
1391 else if (error_count == MAX_ERRORS_IN_A_ROW)
1393 if (error)
1394 einfo (_("%X%B: more undefined references to `%T' follow\n"),
1395 abfd, name);
1396 else
1397 einfo (_("%B: warning: more undefined references to `%T' follow\n"),
1398 abfd, name);
1400 else if (error)
1401 einfo ("%X");
1404 return TRUE;
1407 /* Counter to limit the number of relocation overflow error messages
1408 to print. Errors are printed as it is decremented. When it's
1409 called and the counter is zero, a final message is printed
1410 indicating more relocations were omitted. When it gets to -1, no
1411 such errors are printed. If it's initially set to a value less
1412 than -1, all such errors will be printed (--verbose does this). */
1414 int overflow_cutoff_limit = 10;
1416 /* This is called when a reloc overflows. */
1418 static bfd_boolean
1419 reloc_overflow (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1420 struct bfd_link_hash_entry *entry,
1421 const char *name,
1422 const char *reloc_name,
1423 bfd_vma addend,
1424 bfd *abfd,
1425 asection *section,
1426 bfd_vma address)
1428 if (overflow_cutoff_limit == -1)
1429 return TRUE;
1431 einfo ("%X%C:", abfd, section, address);
1433 if (overflow_cutoff_limit >= 0
1434 && overflow_cutoff_limit-- == 0)
1436 einfo (_(" additional relocation overflows omitted from the output\n"));
1437 return TRUE;
1440 if (entry)
1442 while (entry->type == bfd_link_hash_indirect
1443 || entry->type == bfd_link_hash_warning)
1444 entry = entry->u.i.link;
1445 switch (entry->type)
1447 case bfd_link_hash_undefined:
1448 case bfd_link_hash_undefweak:
1449 einfo (_(" relocation truncated to fit: %s against undefined symbol `%T'"),
1450 reloc_name, entry->root.string);
1451 break;
1452 case bfd_link_hash_defined:
1453 case bfd_link_hash_defweak:
1454 einfo (_(" relocation truncated to fit: %s against symbol `%T' defined in %A section in %B"),
1455 reloc_name, entry->root.string,
1456 entry->u.def.section,
1457 entry->u.def.section == bfd_abs_section_ptr
1458 ? output_bfd : entry->u.def.section->owner);
1459 break;
1460 default:
1461 abort ();
1462 break;
1465 else
1466 einfo (_(" relocation truncated to fit: %s against `%T'"),
1467 reloc_name, name);
1468 if (addend != 0)
1469 einfo ("+%v", addend);
1470 einfo ("\n");
1471 return TRUE;
1474 /* This is called when a dangerous relocation is made. */
1476 static bfd_boolean
1477 reloc_dangerous (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1478 const char *message,
1479 bfd *abfd,
1480 asection *section,
1481 bfd_vma address)
1483 einfo (_("%X%C: dangerous relocation: %s\n"),
1484 abfd, section, address, message);
1485 return TRUE;
1488 /* This is called when a reloc is being generated attached to a symbol
1489 that is not being output. */
1491 static bfd_boolean
1492 unattached_reloc (struct bfd_link_info *info ATTRIBUTE_UNUSED,
1493 const char *name,
1494 bfd *abfd,
1495 asection *section,
1496 bfd_vma address)
1498 einfo (_("%X%C: reloc refers to symbol `%T' which is not being output\n"),
1499 abfd, section, address, name);
1500 return TRUE;
1503 /* This is called if link_info.notice_all is set, or when a symbol in
1504 link_info.notice_hash is found. Symbols are put in notice_hash
1505 using the -y option. */
1507 static bfd_boolean
1508 notice (struct bfd_link_info *info,
1509 const char *name,
1510 bfd *abfd,
1511 asection *section,
1512 bfd_vma value)
1514 if (! info->notice_all
1515 || (info->notice_hash != NULL
1516 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1518 if (bfd_is_und_section (section))
1519 einfo ("%B: reference to %s\n", abfd, name);
1520 else
1521 einfo ("%B: definition of %s\n", abfd, name);
1524 if (command_line.cref || nocrossref_list != NULL)
1525 add_cref (name, abfd, section, value);
1527 return TRUE;