1 /* Main program of GNU linker.
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
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)
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, 59 Temple Place - Suite 330, Boston, MA
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 #include "filenames.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)
53 #ifdef NEED_DECLARATION_SBRK
58 #ifndef TARGET_SYSTEM_ROOT
59 #define TARGET_SYSTEM_ROOT ""
62 int main PARAMS ((int, char **));
67 const char *output_filename = "a.out";
69 /* Name this program was invoked by. */
72 /* The prefix for system library directories. */
75 /* The canonical representation of ld_sysroot. */
76 char * ld_canon_sysroot;
77 int ld_canon_sysroot_len;
79 /* The file that we're creating. */
82 /* Set by -G argument, for MIPS ECOFF target. */
83 int g_switch_value = 8;
85 /* Nonzero means print names of input files as processed. */
86 bfd_boolean trace_files;
88 /* Nonzero means same, but note open failures, too. */
89 bfd_boolean trace_file_tries;
91 /* Nonzero means version number was printed, so exit successfully
92 instead of complaining if no input files are given. */
93 bfd_boolean version_printed;
95 /* Nonzero means link in every member of an archive. */
96 bfd_boolean whole_archive;
98 /* TRUE if we should demangle symbol names. */
99 bfd_boolean demangling;
101 args_type command_line;
103 ld_config_type config;
105 static char *get_emulation
106 PARAMS ((int, char **));
107 static void set_scripts_dir
109 static void remove_output
111 static bfd_boolean check_for_scripts_dir
113 static bfd_boolean add_archive_element
114 PARAMS ((struct bfd_link_info *, bfd *, const char *));
115 static bfd_boolean multiple_definition
116 PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
117 bfd *, asection *, bfd_vma));
118 static bfd_boolean multiple_common
119 PARAMS ((struct bfd_link_info *, const char *, bfd *,
120 enum bfd_link_hash_type, bfd_vma, bfd *, enum bfd_link_hash_type,
122 static bfd_boolean add_to_set
123 PARAMS ((struct bfd_link_info *, struct bfd_link_hash_entry *,
124 bfd_reloc_code_real_type, bfd *, asection *, bfd_vma));
125 static bfd_boolean constructor_callback
126 PARAMS ((struct bfd_link_info *, bfd_boolean, const char *, bfd *,
127 asection *, bfd_vma));
128 static bfd_boolean warning_callback
129 PARAMS ((struct bfd_link_info *, const char *, const char *, bfd *,
130 asection *, bfd_vma));
131 static void warning_find_reloc
132 PARAMS ((bfd *, asection *, PTR));
133 static bfd_boolean undefined_symbol
134 PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
136 static bfd_boolean reloc_overflow
137 PARAMS ((struct bfd_link_info *, const char *, const char *, bfd_vma,
138 bfd *, asection *, bfd_vma));
139 static bfd_boolean reloc_dangerous
140 PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma));
141 static bfd_boolean unattached_reloc
142 PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma));
143 static bfd_boolean notice
144 PARAMS ((struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma));
146 static struct bfd_link_callbacks link_callbacks =
152 constructor_callback,
161 struct bfd_link_info link_info;
168 if (output_bfd && output_bfd->iostream)
169 fclose ((FILE *) (output_bfd->iostream));
170 if (delete_output_file_on_failure)
171 unlink (output_filename);
181 long start_time = get_run_time ();
183 #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
184 setlocale (LC_MESSAGES, "");
186 #if defined (HAVE_SETLOCALE)
187 setlocale (LC_CTYPE, "");
189 bindtextdomain (PACKAGE, LOCALEDIR);
190 textdomain (PACKAGE);
192 program_name = argv[0];
193 xmalloc_set_program_name (program_name);
195 START_PROGRESS (program_name, 0);
199 bfd_set_error_program_name (program_name);
201 xatexit (remove_output);
203 #ifdef TARGET_SYSTEM_ROOT_RELOCATABLE
204 ld_sysroot = make_relative_prefix (program_name, BINDIR,
210 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
221 ld_sysroot = make_relative_prefix (program_name, TOOLBINDIR,
227 int res = stat (ld_sysroot, &s) == 0 && S_ISDIR (s.st_mode);
239 ld_sysroot = TARGET_SYSTEM_ROOT;
241 if (ld_sysroot && *ld_sysroot)
242 ld_canon_sysroot = lrealpath (ld_sysroot);
244 if (ld_canon_sysroot)
245 ld_canon_sysroot_len = strlen (ld_canon_sysroot);
247 ld_canon_sysroot_len = -1;
249 /* Set the default BFD target based on the configured target. Doing
250 this permits the linker to be configured for a particular target,
251 and linked against a shared BFD library which was configured for
252 a different target. The macro TARGET is defined by Makefile. */
253 if (! bfd_set_default_target (TARGET))
255 einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
266 /* Initialize the data about options. */
267 trace_files = trace_file_tries = version_printed = FALSE;
268 whole_archive = FALSE;
269 config.build_constructors = TRUE;
270 config.dynamic_link = FALSE;
271 config.has_shared = FALSE;
272 config.split_by_reloc = (unsigned) -1;
273 config.split_by_file = (bfd_size_type) -1;
274 command_line.force_common_definition = FALSE;
275 command_line.inhibit_common_definition = FALSE;
276 command_line.interpreter = NULL;
277 command_line.rpath = NULL;
278 command_line.warn_mismatch = TRUE;
279 command_line.check_section_addresses = TRUE;
280 command_line.accept_unknown_input_arch = FALSE;
282 /* We initialize DEMANGLING based on the environment variable
283 COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
284 output of the linker, unless COLLECT_NO_DEMANGLE is set in the
285 environment. Acting the same way here lets us provide the same
286 interface by default. */
287 demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
289 link_info.relocateable = FALSE;
290 link_info.emitrelocations = FALSE;
291 link_info.task_link = FALSE;
292 link_info.shared = FALSE;
293 link_info.symbolic = FALSE;
294 link_info.export_dynamic = FALSE;
295 link_info.static_link = FALSE;
296 link_info.traditional_format = FALSE;
297 link_info.optimize = FALSE;
298 link_info.no_undefined = FALSE;
299 link_info.allow_shlib_undefined = TRUE;
300 link_info.allow_multiple_definition = FALSE;
301 link_info.allow_undefined_version = TRUE;
302 link_info.keep_memory = TRUE;
303 link_info.notice_all = FALSE;
304 link_info.nocopyreloc = FALSE;
305 link_info.new_dtags = FALSE;
306 link_info.combreloc = TRUE;
307 link_info.eh_frame_hdr = FALSE;
308 link_info.strip_discarded = TRUE;
309 link_info.strip = strip_none;
310 link_info.discard = discard_sec_merge;
311 link_info.common_skip_ar_aymbols = bfd_link_common_skip_none;
312 link_info.callbacks = &link_callbacks;
313 link_info.hash = NULL;
314 link_info.keep_hash = NULL;
315 link_info.notice_hash = NULL;
316 link_info.wrap_hash = NULL;
317 link_info.input_bfds = NULL;
318 link_info.create_object_symbols_section = NULL;
319 link_info.gc_sym_list = NULL;
320 link_info.base_file = NULL;
321 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
322 and _fini symbols. We are compatible. */
323 link_info.init_function = "_init";
324 link_info.fini_function = "_fini";
325 link_info.mpc860c0 = 0;
326 link_info.pei386_auto_import = -1;
327 link_info.pei386_runtime_pseudo_reloc = FALSE;
328 link_info.spare_dynamic_tags = 5;
329 link_info.flags = (bfd_vma) 0;
330 link_info.flags_1 = (bfd_vma) 0;
332 ldfile_add_arch ("");
334 config.make_executable = TRUE;
335 force_make_executable = FALSE;
336 config.magic_demand_paged = TRUE;
337 config.text_read_only = TRUE;
339 emulation = get_emulation (argc, argv);
340 ldemul_choose_mode (emulation);
341 default_target = ldemul_choose_target (argc, argv);
343 ldemul_before_parse ();
344 lang_has_input_file = FALSE;
345 parse_args (argc, argv);
347 ldemul_set_symbols ();
349 if (link_info.relocateable)
351 if (command_line.gc_sections)
352 einfo ("%P%F: --gc-sections and -r may not be used together\n");
353 if (link_info.mpc860c0)
354 einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
355 else if (command_line.relax)
356 einfo (_("%P%F: --relax and -r may not be used together\n"));
357 if (link_info.shared)
358 einfo (_("%P%F: -r and -shared may not be used together\n"));
361 if (! link_info.shared)
363 if (command_line.filter_shlib)
364 einfo (_("%P%F: -F may not be used without -shared\n"));
365 if (command_line.auxiliary_filters)
366 einfo (_("%P%F: -f may not be used without -shared\n"));
369 /* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
370 don't see how else this can be handled, since in this case we
371 must preserve all externally visible symbols. */
372 if (link_info.relocateable && link_info.strip == strip_all)
374 link_info.strip = strip_debugger;
375 if (link_info.discard == discard_sec_merge)
376 link_info.discard = discard_all;
379 /* This essentially adds another -L directory so this must be done after
380 the -L's in argv have been processed. */
383 /* If we have not already opened and parsed a linker script
384 read the emulation's appropriate default script. */
385 if (saved_script_handle == NULL)
388 char *s = ldemul_get_script (&isfile);
391 ldfile_open_command_file (s);
397 parser_input = input_script;
402 if (trace_file_tries)
404 if (saved_script_handle)
405 info_msg (_("using external linker script:"));
407 info_msg (_("using internal linker script:"));
408 info_msg ("\n==================================================\n");
410 if (saved_script_handle)
412 static const int ld_bufsz = 8193;
414 char *buf = xmalloc (ld_bufsz);
416 rewind (saved_script_handle);
417 while ((n = fread (buf, 1, ld_bufsz - 1, saved_script_handle)) > 0)
422 rewind (saved_script_handle);
429 info_msg (ldemul_get_script (&isfile));
432 info_msg ("\n==================================================\n");
437 if (!lang_has_input_file)
441 einfo (_("%P%F: no input files\n"));
445 info_msg (_("%P: mode %s\n"), emulation);
447 ldemul_after_parse ();
449 if (config.map_filename)
451 if (strcmp (config.map_filename, "-") == 0)
453 config.map_file = stdout;
457 config.map_file = fopen (config.map_filename, FOPEN_WT);
458 if (config.map_file == (FILE *) NULL)
460 bfd_set_error (bfd_error_system_call);
461 einfo (_("%P%F: cannot open map file %s: %E\n"),
462 config.map_filename);
469 /* Print error messages for any missing symbols, for any warning
470 symbols, and possibly multiple definitions. */
471 if (link_info.relocateable)
472 output_bfd->flags &= ~EXEC_P;
474 output_bfd->flags |= EXEC_P;
478 if (config.map_file != NULL)
480 if (command_line.cref)
481 output_cref (config.map_file != NULL ? config.map_file : stdout);
482 if (nocrossref_list != NULL)
483 check_nocrossrefs ();
485 /* Even if we're producing relocateable output, some non-fatal errors should
486 be reported in the exit status. (What non-fatal errors, if any, do we
487 want to ignore for relocateable output?) */
488 if (!config.make_executable && !force_make_executable)
491 einfo (_("%P: link errors found, deleting executable `%s'\n"),
494 /* The file will be removed by remove_output. */
499 if (! bfd_close (output_bfd))
500 einfo (_("%F%B: final close failed: %E\n"), output_bfd);
502 /* If the --force-exe-suffix is enabled, and we're making an
503 executable file and it doesn't end in .exe, copy it to one
505 if (! link_info.relocateable && command_line.force_exe_suffix)
507 int len = strlen (output_filename);
510 || (strcasecmp (output_filename + len - 4, ".exe") != 0
511 && strcasecmp (output_filename + len - 4, ".dll") != 0))
515 const int bsize = 4096;
516 char *buf = xmalloc (bsize);
518 char *dst_name = xmalloc (len + 5);
520 strcpy (dst_name, output_filename);
521 strcat (dst_name, ".exe");
522 src = fopen (output_filename, FOPEN_RB);
523 dst = fopen (dst_name, FOPEN_WB);
526 einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
528 einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
529 while ((l = fread (buf, 1, bsize, src)) > 0)
531 int done = fwrite (buf, 1, l, dst);
534 einfo (_("%P: Error writing file `%s'\n"), dst_name);
538 if (fclose (dst) == EOF)
539 einfo (_("%P: Error closing file `%s'\n"), dst_name);
546 END_PROGRESS (program_name);
551 char *lim = (char *) sbrk (0);
553 long run_time = get_run_time () - start_time;
555 fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
556 program_name, run_time / 1000000, run_time % 1000000);
558 fprintf (stderr, _("%s: data size %ld\n"), program_name,
559 (long) (lim - (char *) &environ));
563 /* Prevent remove_output from doing anything, after a successful link. */
564 output_filename = NULL;
570 /* We need to find any explicitly given emulation in order to initialize the
571 state that's needed by the lex&yacc argument parser (parse_args). */
574 get_emulation (argc, argv)
581 emulation = getenv (EMULATION_ENVIRON);
582 if (emulation == NULL)
583 emulation = DEFAULT_EMULATION;
585 for (i = 1; i < argc; i++)
587 if (!strncmp (argv[i], "-m", 2))
589 if (argv[i][2] == '\0')
594 emulation = argv[i + 1];
598 einfo (_("%P%F: missing argument to -m\n"));
600 else if (strcmp (argv[i], "-mips1") == 0
601 || strcmp (argv[i], "-mips2") == 0
602 || strcmp (argv[i], "-mips3") == 0
603 || strcmp (argv[i], "-mips4") == 0
604 || strcmp (argv[i], "-mips5") == 0
605 || strcmp (argv[i], "-mips32") == 0
606 || strcmp (argv[i], "-mips32r2") == 0
607 || strcmp (argv[i], "-mips64") == 0)
609 /* FIXME: The arguments -mips1, -mips2, -mips3, etc. are
610 passed to the linker by some MIPS compilers. They
611 generally tell the linker to use a slightly different
612 library path. Perhaps someday these should be
613 implemented as emulations; until then, we just ignore
614 the arguments and hope that nobody ever creates
615 emulations named ips1, ips2 or ips3. */
617 else if (strcmp (argv[i], "-m486") == 0)
619 /* FIXME: The argument -m486 is passed to the linker on
620 some Linux systems. Hope that nobody creates an
621 emulation named 486. */
626 emulation = &argv[i][2];
634 /* If directory DIR contains an "ldscripts" subdirectory,
635 add DIR to the library search path and return TRUE,
636 else return FALSE. */
639 check_for_scripts_dir (dir)
647 dirlen = strlen (dir);
648 /* sizeof counts the terminating NUL. */
649 buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
650 sprintf (buf, "%s/ldscripts", dir);
652 res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
655 ldfile_add_library_path (dir, FALSE);
659 /* Set the default directory for finding script files.
660 Libraries will be searched for here too, but that's ok.
661 We look for the "ldscripts" directory in:
663 SCRIPTDIR (passed from Makefile)
664 (adjusted according to the current location of the binary)
665 SCRIPTDIR (passed from Makefile)
666 the dir where this program is (for using it from the build tree)
667 the dir where this program is/../lib
668 (for installing the tool suite elsewhere). */
676 dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
677 if (dir && check_for_scripts_dir (dir))
678 /* Success. Don't free dir. */
684 dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
685 if (dir && check_for_scripts_dir (dir))
686 /* Success. Don't free dir. */
692 if (check_for_scripts_dir (SCRIPTDIR))
693 /* We've been installed normally. */
696 /* Look for "ldscripts" in the dir where our binary is. */
697 end = strrchr (program_name, '/');
698 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
700 /* We could have \foo\bar, or /foo\bar. */
701 char *bslash = strrchr (program_name, '\\');
703 if (end == NULL || (bslash != NULL && bslash > end))
709 /* Don't look for ldscripts in the current directory. There is
710 too much potential for confusion. */
713 dirlen = end - program_name;
714 /* Make a copy of program_name in dir.
715 Leave room for later "/../lib". */
716 dir = (char *) xmalloc (dirlen + 8);
717 strncpy (dir, program_name, dirlen);
720 if (check_for_scripts_dir (dir))
721 /* Don't free dir. */
724 /* Look for "ldscripts" in <the dir where our binary is>/../lib. */
725 strcpy (dir + dirlen, "/../lib");
726 if (check_for_scripts_dir (dir))
729 /* Well, we tried. */
737 if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
739 link_info.notice_hash = ((struct bfd_hash_table *)
740 xmalloc (sizeof (struct bfd_hash_table)));
741 if (! bfd_hash_table_init_n (link_info.notice_hash,
744 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
747 if (bfd_hash_lookup (link_info.notice_hash, name, TRUE, TRUE)
748 == (struct bfd_hash_entry *) NULL)
749 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
752 /* Record a symbol to be wrapped, from the --wrap option. */
758 if (link_info.wrap_hash == NULL)
760 link_info.wrap_hash = ((struct bfd_hash_table *)
761 xmalloc (sizeof (struct bfd_hash_table)));
762 if (! bfd_hash_table_init_n (link_info.wrap_hash,
765 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
768 if (bfd_hash_lookup (link_info.wrap_hash, name, TRUE, TRUE) == NULL)
769 einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
772 /* Handle the -retain-symbols-file option. */
775 add_keepsyms_file (filename)
776 const char *filename;
783 if (link_info.strip == strip_some)
784 einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
786 file = fopen (filename, "r");
787 if (file == (FILE *) NULL)
789 bfd_set_error (bfd_error_system_call);
790 einfo ("%X%P: %s: %E\n", filename);
794 link_info.keep_hash = ((struct bfd_hash_table *)
795 xmalloc (sizeof (struct bfd_hash_table)));
796 if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
797 einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
800 buf = (char *) xmalloc (bufsize);
812 while (! ISSPACE (c) && c != EOF)
819 buf = xrealloc (buf, bufsize);
826 if (bfd_hash_lookup (link_info.keep_hash, buf, TRUE, TRUE)
827 == (struct bfd_hash_entry *) NULL)
828 einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
832 if (link_info.strip != strip_none)
833 einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
835 link_info.strip = strip_some;
838 /* Callbacks from the BFD linker routines. */
840 /* This is called when BFD has decided to include an archive member in
844 add_archive_element (info, abfd, name)
845 struct bfd_link_info *info ATTRIBUTE_UNUSED;
849 lang_input_statement_type *input;
851 input = ((lang_input_statement_type *)
852 xmalloc (sizeof (lang_input_statement_type)));
853 input->filename = abfd->filename;
854 input->local_sym_name = abfd->filename;
855 input->the_bfd = abfd;
856 input->asymbols = NULL;
858 input->just_syms_flag = FALSE;
859 input->loaded = FALSE;
860 input->search_dirs_flag = FALSE;
862 /* FIXME: The following fields are not set: header.next,
863 header.type, closed, passive_position, symbol_count,
864 next_real_file, is_archive, target, real. This bit of code is
865 from the old decode_library_subfile function. I don't know
866 whether any of those fields matters. */
868 ldlang_add_file (input);
870 if (config.map_file != (FILE *) NULL)
872 static bfd_boolean header_printed;
873 struct bfd_link_hash_entry *h;
877 h = bfd_link_hash_lookup (link_info.hash, name, FALSE, FALSE, TRUE);
889 case bfd_link_hash_defined:
890 case bfd_link_hash_defweak:
891 from = h->u.def.section->owner;
894 case bfd_link_hash_undefined:
895 case bfd_link_hash_undefweak:
896 from = h->u.undef.abfd;
899 case bfd_link_hash_common:
900 from = h->u.c.p->section->owner;
905 if (! header_printed)
909 sprintf (buf, _("Archive member included because of file (symbol)\n\n"));
911 header_printed = TRUE;
914 if (bfd_my_archive (abfd) == NULL)
916 minfo ("%s", bfd_get_filename (abfd));
917 len = strlen (bfd_get_filename (abfd));
921 minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
922 bfd_get_filename (abfd));
923 len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
924 + strlen (bfd_get_filename (abfd))
942 minfo ("(%T)\n", h->root.string);
944 minfo ("(%s)\n", name);
947 if (trace_files || trace_file_tries)
948 info_msg ("%I\n", input);
953 /* This is called when BFD has discovered a symbol which is defined
957 multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
958 struct bfd_link_info *info ATTRIBUTE_UNUSED;
967 /* If either section has the output_section field set to
968 bfd_abs_section_ptr, it means that the section is being
969 discarded, and this is not really a multiple definition at all.
970 FIXME: It would be cleaner to somehow ignore symbols defined in
971 sections which are being discarded. */
972 if ((osec->output_section != NULL
973 && ! bfd_is_abs_section (osec)
974 && bfd_is_abs_section (osec->output_section))
975 || (nsec->output_section != NULL
976 && ! bfd_is_abs_section (nsec)
977 && bfd_is_abs_section (nsec->output_section)))
980 einfo (_("%X%C: multiple definition of `%T'\n"),
981 nbfd, nsec, nval, name);
982 if (obfd != (bfd *) NULL)
983 einfo (_("%D: first defined here\n"), obfd, osec, oval);
985 if (command_line.relax)
987 einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
988 command_line.relax = 0;
994 /* This is called when there is a definition of a common symbol, or
995 when a common symbol is found for a symbol that is already defined,
996 or when two common symbols are found. We only do something if
997 -warn-common was used. */
1000 multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
1001 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1004 enum bfd_link_hash_type otype;
1007 enum bfd_link_hash_type ntype;
1010 if (! config.warn_common)
1013 if (ntype == bfd_link_hash_defined
1014 || ntype == bfd_link_hash_defweak
1015 || ntype == bfd_link_hash_indirect)
1017 ASSERT (otype == bfd_link_hash_common);
1018 einfo (_("%B: warning: definition of `%T' overriding common\n"),
1021 einfo (_("%B: warning: common is here\n"), obfd);
1023 else if (otype == bfd_link_hash_defined
1024 || otype == bfd_link_hash_defweak
1025 || otype == bfd_link_hash_indirect)
1027 ASSERT (ntype == bfd_link_hash_common);
1028 einfo (_("%B: warning: common of `%T' overridden by definition\n"),
1031 einfo (_("%B: warning: defined here\n"), obfd);
1035 ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
1038 einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
1041 einfo (_("%B: warning: larger common is here\n"), obfd);
1043 else if (nsize > osize)
1045 einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
1048 einfo (_("%B: warning: smaller common is here\n"), obfd);
1052 einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
1054 einfo (_("%B: warning: previous common is here\n"), obfd);
1061 /* This is called when BFD has discovered a set element. H is the
1062 entry in the linker hash table for the set. SECTION and VALUE
1063 represent a value which should be added to the set. */
1066 add_to_set (info, h, reloc, abfd, section, value)
1067 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1068 struct bfd_link_hash_entry *h;
1069 bfd_reloc_code_real_type reloc;
1074 if (config.warn_constructors)
1075 einfo (_("%P: warning: global constructor %s used\n"),
1078 if (! config.build_constructors)
1081 ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
1083 if (h->type == bfd_link_hash_new)
1085 h->type = bfd_link_hash_undefined;
1086 h->u.undef.abfd = abfd;
1087 /* We don't call bfd_link_add_undef to add this to the list of
1088 undefined symbols because we are going to define it
1095 /* This is called when BFD has discovered a constructor. This is only
1096 called for some object file formats--those which do not handle
1097 constructors in some more clever fashion. This is similar to
1098 adding an element to a set, but less general. */
1101 constructor_callback (info, constructor, name, abfd, section, value)
1102 struct bfd_link_info *info;
1103 bfd_boolean constructor;
1110 struct bfd_link_hash_entry *h;
1111 char set_name[1 + sizeof "__CTOR_LIST__"];
1113 if (config.warn_constructors)
1114 einfo (_("%P: warning: global constructor %s used\n"), name);
1116 if (! config.build_constructors)
1119 /* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
1120 useful error message. */
1121 if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
1122 && (link_info.relocateable
1123 || bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
1124 einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
1127 if (bfd_get_symbol_leading_char (abfd) != '\0')
1128 *s++ = bfd_get_symbol_leading_char (abfd);
1130 strcpy (s, "__CTOR_LIST__");
1132 strcpy (s, "__DTOR_LIST__");
1134 h = bfd_link_hash_lookup (info->hash, set_name, TRUE, TRUE, TRUE);
1135 if (h == (struct bfd_link_hash_entry *) NULL)
1136 einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
1137 if (h->type == bfd_link_hash_new)
1139 h->type = bfd_link_hash_undefined;
1140 h->u.undef.abfd = abfd;
1141 /* We don't call bfd_link_add_undef to add this to the list of
1142 undefined symbols because we are going to define it
1146 ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
1150 /* A structure used by warning_callback to pass information through
1151 bfd_map_over_sections. */
1153 struct warning_callback_info
1156 const char *warning;
1161 /* This is called when there is a reference to a warning symbol. */
1164 warning_callback (info, warning, symbol, abfd, section, address)
1165 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1166 const char *warning;
1172 /* This is a hack to support warn_multiple_gp. FIXME: This should
1173 have a cleaner interface, but what? */
1174 if (! config.warn_multiple_gp
1175 && strcmp (warning, "using multiple gp values") == 0)
1178 if (section != NULL)
1179 einfo ("%C: %s\n", abfd, section, address, warning);
1180 else if (abfd == NULL)
1181 einfo ("%P: %s\n", warning);
1182 else if (symbol == NULL)
1183 einfo ("%B: %s\n", abfd, warning);
1186 lang_input_statement_type *entry;
1188 struct warning_callback_info info;
1190 /* Look through the relocs to see if we can find a plausible
1192 entry = (lang_input_statement_type *) abfd->usrdata;
1193 if (entry != NULL && entry->asymbols != NULL)
1194 asymbols = entry->asymbols;
1200 symsize = bfd_get_symtab_upper_bound (abfd);
1202 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1203 asymbols = (asymbol **) xmalloc (symsize);
1204 symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
1205 if (symbol_count < 0)
1206 einfo (_("%B%F: could not read symbols: %E\n"), abfd);
1209 entry->asymbols = asymbols;
1210 entry->symbol_count = symbol_count;
1215 info.warning = warning;
1216 info.symbol = symbol;
1217 info.asymbols = asymbols;
1218 bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
1221 einfo ("%B: %s\n", abfd, warning);
1230 /* This is called by warning_callback for each section. It checks the
1231 relocs of the section to see if it can find a reference to the
1232 symbol which triggered the warning. If it can, it uses the reloc
1233 to give an error message with a file and line number. */
1236 warning_find_reloc (abfd, sec, iarg)
1241 struct warning_callback_info *info = (struct warning_callback_info *) iarg;
1245 arelent **p, **pend;
1250 relsize = bfd_get_reloc_upper_bound (abfd, sec);
1252 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1256 relpp = (arelent **) xmalloc (relsize);
1257 relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
1259 einfo (_("%B%F: could not read relocs: %E\n"), abfd);
1262 pend = p + relcount;
1263 for (; p < pend && *p != NULL; p++)
1267 if (q->sym_ptr_ptr != NULL
1268 && *q->sym_ptr_ptr != NULL
1269 && strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
1271 /* We found a reloc for the symbol we are looking for. */
1272 einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
1281 /* This is called when an undefined symbol is found. */
1284 undefined_symbol (info, name, abfd, section, address, fatal)
1285 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1290 bfd_boolean fatal ATTRIBUTE_UNUSED;
1292 static char *error_name;
1293 static unsigned int error_count;
1295 #define MAX_ERRORS_IN_A_ROW 5
1297 if (config.warn_once)
1299 static struct bfd_hash_table *hash;
1301 /* Only warn once about a particular undefined symbol. */
1304 hash = ((struct bfd_hash_table *)
1305 xmalloc (sizeof (struct bfd_hash_table)));
1306 if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
1307 einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
1310 if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
1313 if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
1314 einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
1317 /* We never print more than a reasonable number of errors in a row
1318 for a single symbol. */
1319 if (error_name != (char *) NULL
1320 && strcmp (name, error_name) == 0)
1325 if (error_name != (char *) NULL)
1327 error_name = xstrdup (name);
1330 if (section != NULL)
1332 if (error_count < MAX_ERRORS_IN_A_ROW)
1334 einfo (_("%C: undefined reference to `%T'\n"),
1335 abfd, section, address, name);
1339 else if (error_count == MAX_ERRORS_IN_A_ROW)
1340 einfo (_("%D: more undefined references to `%T' follow\n"),
1341 abfd, section, address, name);
1345 if (error_count < MAX_ERRORS_IN_A_ROW)
1347 einfo (_("%B: undefined reference to `%T'\n"),
1352 else if (error_count == MAX_ERRORS_IN_A_ROW)
1353 einfo (_("%B: more undefined references to `%T' follow\n"),
1360 /* This is called when a reloc overflows. */
1363 reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
1364 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1366 const char *reloc_name;
1372 if (abfd == (bfd *) NULL)
1373 einfo (_("%P%X: generated"));
1375 einfo ("%X%C:", abfd, section, address);
1376 einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
1378 einfo ("+%v", addend);
1383 /* This is called when a dangerous relocation is made. */
1386 reloc_dangerous (info, message, abfd, section, address)
1387 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1388 const char *message;
1393 if (abfd == (bfd *) NULL)
1394 einfo (_("%P%X: generated"));
1396 einfo ("%X%C:", abfd, section, address);
1397 einfo (_("dangerous relocation: %s\n"), message);
1401 /* This is called when a reloc is being generated attached to a symbol
1402 that is not being output. */
1405 unattached_reloc (info, name, abfd, section, address)
1406 struct bfd_link_info *info ATTRIBUTE_UNUSED;
1412 if (abfd == (bfd *) NULL)
1413 einfo (_("%P%X: generated"));
1415 einfo ("%X%C:", abfd, section, address);
1416 einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
1420 /* This is called if link_info.notice_all is set, or when a symbol in
1421 link_info.notice_hash is found. Symbols are put in notice_hash
1422 using the -y option. */
1425 notice (info, name, abfd, section, value)
1426 struct bfd_link_info *info;
1432 if (! info->notice_all
1433 || (info->notice_hash != NULL
1434 && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
1436 if (bfd_is_und_section (section))
1437 einfo ("%B: reference to %s\n", abfd, name);
1439 einfo ("%B: definition of %s\n", abfd, name);
1442 if (command_line.cref || nocrossref_list != NULL)
1443 add_cref (name, abfd, section, value);