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binutils-gdb/ld/ldmain.c

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/* Main program of GNU linker.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
Free Software Foundation, Inc.
Written by Steve Chamberlain steve@cygnus.com
This file is part of GLD, the Gnu Linker.
GLD is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GLD is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GLD; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include <stdio.h>
#include <ctype.h>
#include "libiberty.h"
#include "progress.h"
#include "bfdlink.h"
#include "filenames.h"
#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldwrite.h"
#include "ldgram.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldlex.h"
#include "ldfile.h"
#include "ldemul.h"
#include "ldctor.h"
/* Somewhere above, sys/stat.h got included . . . . */
#if !defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#include <string.h>
#ifdef HAVE_SBRK
#ifdef NEED_DECLARATION_SBRK
extern PTR sbrk ();
#endif
#endif
static char *get_emulation PARAMS ((int, char **));
static void set_scripts_dir PARAMS ((void));
/* EXPORTS */
char *default_target;
const char *output_filename = "a.out";
/* Name this program was invoked by. */
char *program_name;
/* The file that we're creating. */
bfd *output_bfd = 0;
/* Set by -G argument, for MIPS ECOFF target. */
int g_switch_value = 8;
/* Nonzero means print names of input files as processed. */
boolean trace_files;
/* Nonzero means same, but note open failures, too. */
boolean trace_file_tries;
/* Nonzero means version number was printed, so exit successfully
instead of complaining if no input files are given. */
boolean version_printed;
/* Nonzero means link in every member of an archive. */
boolean whole_archive;
/* True if we should demangle symbol names. */
boolean demangling;
args_type command_line;
ld_config_type config;
static void remove_output PARAMS ((void));
static boolean check_for_scripts_dir PARAMS ((char *dir));
static boolean add_archive_element PARAMS ((struct bfd_link_info *, bfd *,
const char *));
static boolean multiple_definition PARAMS ((struct bfd_link_info *,
const char *,
bfd *, asection *, bfd_vma,
bfd *, asection *, bfd_vma));
static boolean multiple_common PARAMS ((struct bfd_link_info *,
const char *, bfd *,
enum bfd_link_hash_type, bfd_vma,
bfd *, enum bfd_link_hash_type,
bfd_vma));
static boolean add_to_set PARAMS ((struct bfd_link_info *,
struct bfd_link_hash_entry *,
bfd_reloc_code_real_type,
bfd *, asection *, bfd_vma));
static boolean constructor_callback PARAMS ((struct bfd_link_info *,
boolean constructor,
const char *name,
bfd *, asection *, bfd_vma));
static boolean warning_callback PARAMS ((struct bfd_link_info *,
const char *, const char *, bfd *,
asection *, bfd_vma));
static void warning_find_reloc PARAMS ((bfd *, asection *, PTR));
static boolean undefined_symbol PARAMS ((struct bfd_link_info *,
const char *, bfd *,
asection *, bfd_vma, boolean));
static boolean reloc_overflow PARAMS ((struct bfd_link_info *, const char *,
const char *, bfd_vma,
bfd *, asection *, bfd_vma));
static boolean reloc_dangerous PARAMS ((struct bfd_link_info *, const char *,
bfd *, asection *, bfd_vma));
static boolean unattached_reloc PARAMS ((struct bfd_link_info *,
const char *, bfd *, asection *,
bfd_vma));
static boolean notice PARAMS ((struct bfd_link_info *, const char *,
bfd *, asection *, bfd_vma));
static struct bfd_link_callbacks link_callbacks = {
add_archive_element,
multiple_definition,
multiple_common,
add_to_set,
constructor_callback,
warning_callback,
undefined_symbol,
reloc_overflow,
reloc_dangerous,
unattached_reloc,
notice
};
struct bfd_link_info link_info;
static void
remove_output ()
{
if (output_filename)
{
if (output_bfd && output_bfd->iostream)
fclose ((FILE *) (output_bfd->iostream));
if (delete_output_file_on_failure)
unlink (output_filename);
}
}
int
main (argc, argv)
int argc;
char **argv;
{
char *emulation;
long start_time = get_run_time ();
#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
setlocale (LC_MESSAGES, "");
#endif
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
program_name = argv[0];
xmalloc_set_program_name (program_name);
START_PROGRESS (program_name, 0);
bfd_init ();
bfd_set_error_program_name (program_name);
xatexit (remove_output);
/* Set the default BFD target based on the configured target. Doing
this permits the linker to be configured for a particular target,
and linked against a shared BFD library which was configured for
a different target. The macro TARGET is defined by Makefile. */
if (! bfd_set_default_target (TARGET))
{
einfo (_("%X%P: can't set BFD default target to `%s': %E\n"), TARGET);
xexit (1);
}
/* Initialize the data about options. */
trace_files = trace_file_tries = version_printed = false;
whole_archive = false;
config.build_constructors = true;
config.dynamic_link = false;
config.has_shared = false;
config.split_by_reloc = (unsigned) -1;
config.split_by_file = (bfd_size_type) -1;
command_line.force_common_definition = false;
command_line.interpreter = NULL;
command_line.rpath = NULL;
command_line.warn_mismatch = true;
command_line.check_section_addresses = true;
/* We initialize DEMANGLING based on the environment variable
COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
output of the linker, unless COLLECT_NO_DEMANGLE is set in the
environment. Acting the same way here lets us provide the same
interface by default. */
demangling = getenv ("COLLECT_NO_DEMANGLE") == NULL;
link_info.callbacks = &link_callbacks;
link_info.relocateable = false;
link_info.emitrelocations = false;
link_info.shared = false;
link_info.symbolic = false;
link_info.export_dynamic = false;
link_info.static_link = false;
link_info.traditional_format = false;
link_info.optimize = false;
link_info.no_undefined = false;
link_info.allow_shlib_undefined = false;
link_info.strip = strip_none;
link_info.discard = discard_sec_merge;
link_info.keep_memory = true;
link_info.input_bfds = NULL;
link_info.create_object_symbols_section = NULL;
link_info.hash = NULL;
link_info.keep_hash = NULL;
link_info.notice_all = false;
link_info.notice_hash = NULL;
link_info.wrap_hash = NULL;
link_info.mpc860c0 = 0;
/* SVR4 linkers seem to set DT_INIT and DT_FINI based on magic _init
and _fini symbols. We are compatible. */
link_info.init_function = "_init";
link_info.fini_function = "_fini";
link_info.new_dtags = false;
link_info.flags = (bfd_vma) 0;
link_info.flags_1 = (bfd_vma) 0;
ldfile_add_arch ("");
config.make_executable = true;
force_make_executable = false;
config.magic_demand_paged = true;
config.text_read_only = true;
emulation = get_emulation (argc, argv);
ldemul_choose_mode (emulation);
default_target = ldemul_choose_target ();
lang_init ();
ldemul_before_parse ();
lang_has_input_file = false;
parse_args (argc, argv);
ldemul_set_symbols ();
if (link_info.relocateable)
{
if (command_line.gc_sections)
einfo ("%P%F: --gc-sections and -r may not be used together\n");
if (link_info.mpc860c0)
einfo (_("%P%F: -r and --mpc860c0 may not be used together\n"));
else if (command_line.relax)
einfo (_("%P%F: --relax and -r may not be used together\n"));
if (link_info.shared)
einfo (_("%P%F: -r and -shared may not be used together\n"));
}
if (! link_info.shared)
{
if (command_line.filter_shlib)
einfo (_("%P%F: -F may not be used without -shared\n"));
if (command_line.auxiliary_filters)
einfo (_("%P%F: -f may not be used without -shared\n"));
}
/* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
don't see how else this can be handled, since in this case we
must preserve all externally visible symbols. */
if (link_info.relocateable && link_info.strip == strip_all)
{
link_info.strip = strip_debugger;
if (link_info.discard == discard_sec_merge)
link_info.discard = discard_all;
}
/* This essentially adds another -L directory so this must be done after
the -L's in argv have been processed. */
set_scripts_dir ();
if (had_script == false)
{
/* Read the emulation's appropriate default script. */
int isfile;
char *s = ldemul_get_script (&isfile);
if (isfile)
ldfile_open_command_file (s);
else
{
if (trace_file_tries)
{
info_msg (_("using internal linker script:\n"));
info_msg ("==================================================\n");
info_msg (s);
info_msg ("\n==================================================\n");
}
lex_string = s;
lex_redirect (s);
}
parser_input = input_script;
yyparse ();
lex_string = NULL;
}
lang_final ();
if (lang_has_input_file == false)
{
if (version_printed)
xexit (0);
einfo (_("%P%F: no input files\n"));
}
if (trace_files)
{
info_msg (_("%P: mode %s\n"), emulation);
}
ldemul_after_parse ();
if (config.map_filename)
{
if (strcmp (config.map_filename, "-") == 0)
{
config.map_file = stdout;
}
else
{
config.map_file = fopen (config.map_filename, FOPEN_WT);
if (config.map_file == (FILE *) NULL)
{
bfd_set_error (bfd_error_system_call);
einfo (_("%P%F: cannot open map file %s: %E\n"),
config.map_filename);
}
}
}
lang_process ();
/* Print error messages for any missing symbols, for any warning
symbols, and possibly multiple definitions. */
if (! link_info.relocateable)
{
/* Look for a text section and switch the readonly attribute in it. */
asection *found = bfd_get_section_by_name (output_bfd, ".text");
if (found != (asection *) NULL)
{
if (config.text_read_only)
found->flags |= SEC_READONLY;
else
found->flags &= ~SEC_READONLY;
}
}
if (link_info.relocateable)
output_bfd->flags &= ~EXEC_P;
else
output_bfd->flags |= EXEC_P;
ldwrite ();
if (config.map_file != NULL)
lang_map ();
if (command_line.cref)
output_cref (config.map_file != NULL ? config.map_file : stdout);
if (nocrossref_list != NULL)
check_nocrossrefs ();
/* Even if we're producing relocateable output, some non-fatal errors should
be reported in the exit status. (What non-fatal errors, if any, do we
want to ignore for relocateable output?) */
if (config.make_executable == false && force_make_executable == false)
{
if (trace_files == true)
{
einfo (_("%P: link errors found, deleting executable `%s'\n"),
output_filename);
}
/* The file will be removed by remove_output. */
xexit (1);
}
else
{
if (! bfd_close (output_bfd))
einfo (_("%F%B: final close failed: %E\n"), output_bfd);
/* If the --force-exe-suffix is enabled, and we're making an
executable file and it doesn't end in .exe, copy it to one
which does. */
if (! link_info.relocateable && command_line.force_exe_suffix)
{
int len = strlen (output_filename);
if (len < 4
|| (strcasecmp (output_filename + len - 4, ".exe") != 0
&& strcasecmp (output_filename + len - 4, ".dll") != 0))
{
FILE *src;
FILE *dst;
const int bsize = 4096;
char *buf = xmalloc (bsize);
int l;
char *dst_name = xmalloc (len + 5);
strcpy (dst_name, output_filename);
strcat (dst_name, ".exe");
src = fopen (output_filename, FOPEN_RB);
dst = fopen (dst_name, FOPEN_WB);
if (!src)
einfo (_("%X%P: unable to open for source of copy `%s'\n"), output_filename);
if (!dst)
einfo (_("%X%P: unable to open for destination of copy `%s'\n"), dst_name);
while ((l = fread (buf, 1, bsize, src)) > 0)
{
int done = fwrite (buf, 1, l, dst);
if (done != l)
{
einfo (_("%P: Error writing file `%s'\n"), dst_name);
}
}
fclose (src);
if (fclose (dst) == EOF)
{
einfo (_("%P: Error closing file `%s'\n"), dst_name);
}
free (dst_name);
free (buf);
}
}
}
END_PROGRESS (program_name);
if (config.stats)
{
#ifdef HAVE_SBRK
char *lim = (char *) sbrk (0);
#endif
long run_time = get_run_time () - start_time;
fprintf (stderr, _("%s: total time in link: %ld.%06ld\n"),
program_name, run_time / 1000000, run_time % 1000000);
#ifdef HAVE_SBRK
fprintf (stderr, _("%s: data size %ld\n"), program_name,
(long) (lim - (char *) &environ));
#endif
}
/* Prevent remove_output from doing anything, after a successful link. */
output_filename = NULL;
xexit (0);
return 0;
}
/* We need to find any explicitly given emulation in order to initialize the
state that's needed by the lex&yacc argument parser (parse_args). */
static char *
get_emulation (argc, argv)
int argc;
char **argv;
{
char *emulation;
int i;
emulation = getenv (EMULATION_ENVIRON);
if (emulation == NULL)
emulation = DEFAULT_EMULATION;
for (i = 1; i < argc; i++)
{
if (!strncmp (argv[i], "-m", 2))
{
if (argv[i][2] == '\0')
{
/* -m EMUL */
if (i < argc - 1)
{
emulation = argv[i + 1];
i++;
}
else
{
einfo (_("%P%F: missing argument to -m\n"));
}
}
else if (strcmp (argv[i], "-mips1") == 0
|| strcmp (argv[i], "-mips2") == 0
|| strcmp (argv[i], "-mips3") == 0
|| strcmp (argv[i], "-mips4") == 0
|| strcmp (argv[i], "-mips5") == 0)
{
/* FIXME: The arguments -mips1, -mips2 and -mips3 are
passed to the linker by some MIPS compilers. They
generally tell the linker to use a slightly different
library path. Perhaps someday these should be
implemented as emulations; until then, we just ignore
the arguments and hope that nobody ever creates
emulations named ips1, ips2 or ips3. */
}
else if (strcmp (argv[i], "-m486") == 0)
{
/* FIXME: The argument -m486 is passed to the linker on
some Linux systems. Hope that nobody creates an
emulation named 486. */
}
else
{
/* -mEMUL */
emulation = &argv[i][2];
}
}
}
return emulation;
}
/* If directory DIR contains an "ldscripts" subdirectory,
add DIR to the library search path and return true,
else return false. */
static boolean
check_for_scripts_dir (dir)
char *dir;
{
size_t dirlen;
char *buf;
struct stat s;
boolean res;
dirlen = strlen (dir);
/* sizeof counts the terminating NUL. */
buf = (char *) xmalloc (dirlen + sizeof ("/ldscripts"));
sprintf (buf, "%s/ldscripts", dir);
res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
free (buf);
if (res)
ldfile_add_library_path (dir, false);
return res;
}
/* Set the default directory for finding script files.
Libraries will be searched for here too, but that's ok.
We look for the "ldscripts" directory in:
SCRIPTDIR (passed from Makefile)
the dir where this program is (for using it from the build tree)
the dir where this program is/../lib (for installing the tool suite elsewhere) */
static void
set_scripts_dir ()
{
char *end, *dir;
size_t dirlen;
if (check_for_scripts_dir (SCRIPTDIR))
/* We've been installed normally. */
return;
/* Look for "ldscripts" in the dir where our binary is. */
end = strrchr (program_name, '/');
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
{
/* We could have \foo\bar, or /foo\bar. */
char *bslash = strrchr (program_name, '\\');
if (end == NULL || (bslash != NULL && bslash > end))
end = bslash;
}
#endif
if (end == NULL)
{
/* Don't look for ldscripts in the current directory. There is
too much potential for confusion. */
return;
}
dirlen = end - program_name;
/* Make a copy of program_name in dir.
Leave room for later "/../lib". */
dir = (char *) xmalloc (dirlen + 8);
strncpy (dir, program_name, dirlen);
dir[dirlen] = '\0';
if (check_for_scripts_dir (dir))
/* Don't free dir. */
return;
/* Look for "ldscripts" in <the dir where our binary is>/../lib. */
strcpy (dir + dirlen, "/../lib");
if (check_for_scripts_dir (dir))
return;
/* Well, we tried. */
free (dir);
}
void
add_ysym (name)
const char *name;
{
if (link_info.notice_hash == (struct bfd_hash_table *) NULL)
{
link_info.notice_hash = ((struct bfd_hash_table *)
xmalloc (sizeof (struct bfd_hash_table)));
if (! bfd_hash_table_init_n (link_info.notice_hash,
bfd_hash_newfunc,
61))
einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
}
if (bfd_hash_lookup (link_info.notice_hash, name, true, true)
== (struct bfd_hash_entry *) NULL)
einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
}
/* Record a symbol to be wrapped, from the --wrap option. */
void
add_wrap (name)
const char *name;
{
if (link_info.wrap_hash == NULL)
{
link_info.wrap_hash = ((struct bfd_hash_table *)
xmalloc (sizeof (struct bfd_hash_table)));
if (! bfd_hash_table_init_n (link_info.wrap_hash,
bfd_hash_newfunc,
61))
einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
}
if (bfd_hash_lookup (link_info.wrap_hash, name, true, true) == NULL)
einfo (_("%P%F: bfd_hash_lookup failed: %E\n"));
}
/* Handle the -retain-symbols-file option. */
void
add_keepsyms_file (filename)
const char *filename;
{
FILE *file;
char *buf;
size_t bufsize;
int c;
if (link_info.strip == strip_some)
einfo (_("%X%P: error: duplicate retain-symbols-file\n"));
file = fopen (filename, "r");
if (file == (FILE *) NULL)
{
bfd_set_error (bfd_error_system_call);
einfo ("%X%P: %s: %E\n", filename);
return;
}
link_info.keep_hash = ((struct bfd_hash_table *)
xmalloc (sizeof (struct bfd_hash_table)));
if (! bfd_hash_table_init (link_info.keep_hash, bfd_hash_newfunc))
einfo (_("%P%F: bfd_hash_table_init failed: %E\n"));
bufsize = 100;
buf = (char *) xmalloc (bufsize);
c = getc (file);
while (c != EOF)
{
while (isspace (c))
c = getc (file);
if (c != EOF)
{
size_t len = 0;
while (! isspace (c) && c != EOF)
{
buf[len] = c;
++len;
if (len >= bufsize)
{
bufsize *= 2;
buf = xrealloc (buf, bufsize);
}
c = getc (file);
}
buf[len] = '\0';
if (bfd_hash_lookup (link_info.keep_hash, buf, true, true)
== (struct bfd_hash_entry *) NULL)
einfo (_("%P%F: bfd_hash_lookup for insertion failed: %E\n"));
}
}
if (link_info.strip != strip_none)
einfo (_("%P: `-retain-symbols-file' overrides `-s' and `-S'\n"));
link_info.strip = strip_some;
}
/* Callbacks from the BFD linker routines. */
/* This is called when BFD has decided to include an archive member in
a link. */
static boolean
add_archive_element (info, abfd, name)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
bfd *abfd;
const char *name;
{
lang_input_statement_type *input;
input = ((lang_input_statement_type *)
xmalloc (sizeof (lang_input_statement_type)));
input->filename = abfd->filename;
input->local_sym_name = abfd->filename;
input->the_bfd = abfd;
input->asymbols = NULL;
input->next = NULL;
input->just_syms_flag = false;
input->loaded = false;
input->search_dirs_flag = false;
/* FIXME: The following fields are not set: header.next,
header.type, closed, passive_position, symbol_count,
next_real_file, is_archive, target, real. This bit of code is
from the old decode_library_subfile function. I don't know
whether any of those fields matters. */
ldlang_add_file (input);
if (config.map_file != (FILE *) NULL)
{
static boolean header_printed;
struct bfd_link_hash_entry *h;
bfd *from;
int len;
h = bfd_link_hash_lookup (link_info.hash, name, false, false, true);
if (h == NULL)
from = NULL;
else
{
switch (h->type)
{
default:
from = NULL;
break;
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
from = h->u.def.section->owner;
break;
case bfd_link_hash_undefined:
case bfd_link_hash_undefweak:
from = h->u.undef.abfd;
break;
case bfd_link_hash_common:
from = h->u.c.p->section->owner;
break;
}
}
if (! header_printed)
{
char buf[100];
sprintf (buf, "%-29s %s\n\n", _("Archive member included"),
_("because of file (symbol)"));
minfo ("%s", buf);
header_printed = true;
}
if (bfd_my_archive (abfd) == NULL)
{
minfo ("%s", bfd_get_filename (abfd));
len = strlen (bfd_get_filename (abfd));
}
else
{
minfo ("%s(%s)", bfd_get_filename (bfd_my_archive (abfd)),
bfd_get_filename (abfd));
len = (strlen (bfd_get_filename (bfd_my_archive (abfd)))
+ strlen (bfd_get_filename (abfd))
+ 2);
}
if (len >= 29)
{
print_nl ();
len = 0;
}
while (len < 30)
{
print_space ();
++len;
}
if (from != NULL)
minfo ("%B ", from);
if (h != NULL)
minfo ("(%T)\n", h->root.string);
else
minfo ("(%s)\n", name);
}
if (trace_files || trace_file_tries)
info_msg ("%I\n", input);
return true;
}
/* This is called when BFD has discovered a symbol which is defined
multiple times. */
static boolean
multiple_definition (info, name, obfd, osec, oval, nbfd, nsec, nval)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *name;
bfd *obfd;
asection *osec;
bfd_vma oval;
bfd *nbfd;
asection *nsec;
bfd_vma nval;
{
/* If either section has the output_section field set to
bfd_abs_section_ptr, it means that the section is being
discarded, and this is not really a multiple definition at all.
FIXME: It would be cleaner to somehow ignore symbols defined in
sections which are being discarded. */
if ((osec->output_section != NULL
&& ! bfd_is_abs_section (osec)
&& bfd_is_abs_section (osec->output_section))
|| (nsec->output_section != NULL
&& ! bfd_is_abs_section (nsec)
&& bfd_is_abs_section (nsec->output_section)))
return true;
einfo (_("%X%C: multiple definition of `%T'\n"),
nbfd, nsec, nval, name);
if (obfd != (bfd *) NULL)
einfo (_("%D: first defined here\n"), obfd, osec, oval);
if (command_line.relax)
{
einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
command_line.relax = 0;
}
return true;
}
/* This is called when there is a definition of a common symbol, or
when a common symbol is found for a symbol that is already defined,
or when two common symbols are found. We only do something if
-warn-common was used. */
static boolean
multiple_common (info, name, obfd, otype, osize, nbfd, ntype, nsize)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *name;
bfd *obfd;
enum bfd_link_hash_type otype;
bfd_vma osize;
bfd *nbfd;
enum bfd_link_hash_type ntype;
bfd_vma nsize;
{
if (! config.warn_common)
return true;
if (ntype == bfd_link_hash_defined
|| ntype == bfd_link_hash_defweak
|| ntype == bfd_link_hash_indirect)
{
ASSERT (otype == bfd_link_hash_common);
einfo (_("%B: warning: definition of `%T' overriding common\n"),
nbfd, name);
if (obfd != NULL)
einfo (_("%B: warning: common is here\n"), obfd);
}
else if (otype == bfd_link_hash_defined
|| otype == bfd_link_hash_defweak
|| otype == bfd_link_hash_indirect)
{
ASSERT (ntype == bfd_link_hash_common);
einfo (_("%B: warning: common of `%T' overridden by definition\n"),
nbfd, name);
if (obfd != NULL)
einfo (_("%B: warning: defined here\n"), obfd);
}
else
{
ASSERT (otype == bfd_link_hash_common && ntype == bfd_link_hash_common);
if (osize > nsize)
{
einfo (_("%B: warning: common of `%T' overridden by larger common\n"),
nbfd, name);
if (obfd != NULL)
einfo (_("%B: warning: larger common is here\n"), obfd);
}
else if (nsize > osize)
{
einfo (_("%B: warning: common of `%T' overriding smaller common\n"),
nbfd, name);
if (obfd != NULL)
einfo (_("%B: warning: smaller common is here\n"), obfd);
}
else
{
einfo (_("%B: warning: multiple common of `%T'\n"), nbfd, name);
if (obfd != NULL)
einfo (_("%B: warning: previous common is here\n"), obfd);
}
}
return true;
}
/* This is called when BFD has discovered a set element. H is the
entry in the linker hash table for the set. SECTION and VALUE
represent a value which should be added to the set. */
static boolean
add_to_set (info, h, reloc, abfd, section, value)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
struct bfd_link_hash_entry *h;
bfd_reloc_code_real_type reloc;
bfd *abfd;
asection *section;
bfd_vma value;
{
if (config.warn_constructors)
einfo (_("%P: warning: global constructor %s used\n"),
h->root.string);
if (! config.build_constructors)
return true;
ldctor_add_set_entry (h, reloc, (const char *) NULL, section, value);
if (h->type == bfd_link_hash_new)
{
h->type = bfd_link_hash_undefined;
h->u.undef.abfd = abfd;
/* We don't call bfd_link_add_undef to add this to the list of
undefined symbols because we are going to define it
ourselves. */
}
return true;
}
/* This is called when BFD has discovered a constructor. This is only
called for some object file formats--those which do not handle
constructors in some more clever fashion. This is similar to
adding an element to a set, but less general. */
static boolean
constructor_callback (info, constructor, name, abfd, section, value)
struct bfd_link_info *info;
boolean constructor;
const char *name;
bfd *abfd;
asection *section;
bfd_vma value;
{
char *s;
struct bfd_link_hash_entry *h;
char set_name[1 + sizeof "__CTOR_LIST__"];
if (config.warn_constructors)
einfo (_("%P: warning: global constructor %s used\n"), name);
if (! config.build_constructors)
return true;
/* Ensure that BFD_RELOC_CTOR exists now, so that we can give a
useful error message. */
if (bfd_reloc_type_lookup (output_bfd, BFD_RELOC_CTOR) == NULL
&& (link_info.relocateable
|| bfd_reloc_type_lookup (abfd, BFD_RELOC_CTOR) == NULL))
einfo (_("%P%F: BFD backend error: BFD_RELOC_CTOR unsupported\n"));
s = set_name;
if (bfd_get_symbol_leading_char (abfd) != '\0')
*s++ = bfd_get_symbol_leading_char (abfd);
if (constructor)
strcpy (s, "__CTOR_LIST__");
else
strcpy (s, "__DTOR_LIST__");
h = bfd_link_hash_lookup (info->hash, set_name, true, true, true);
if (h == (struct bfd_link_hash_entry *) NULL)
einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
if (h->type == bfd_link_hash_new)
{
h->type = bfd_link_hash_undefined;
h->u.undef.abfd = abfd;
/* We don't call bfd_link_add_undef to add this to the list of
undefined symbols because we are going to define it
ourselves. */
}
ldctor_add_set_entry (h, BFD_RELOC_CTOR, name, section, value);
return true;
}
/* A structure used by warning_callback to pass information through
bfd_map_over_sections. */
struct warning_callback_info {
boolean found;
const char *warning;
const char *symbol;
asymbol **asymbols;
};
/* This is called when there is a reference to a warning symbol. */
static boolean
warning_callback (info, warning, symbol, abfd, section, address)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *warning;
const char *symbol;
bfd *abfd;
asection *section;
bfd_vma address;
{
/* This is a hack to support warn_multiple_gp. FIXME: This should
have a cleaner interface, but what? */
if (! config.warn_multiple_gp
&& strcmp (warning, "using multiple gp values") == 0)
return true;
if (section != NULL)
einfo ("%C: %s\n", abfd, section, address, warning);
else if (abfd == NULL)
einfo ("%P: %s\n", warning);
else if (symbol == NULL)
einfo ("%B: %s\n", abfd, warning);
else
{
lang_input_statement_type *entry;
asymbol **asymbols;
struct warning_callback_info info;
/* Look through the relocs to see if we can find a plausible
address. */
entry = (lang_input_statement_type *) abfd->usrdata;
if (entry != NULL && entry->asymbols != NULL)
asymbols = entry->asymbols;
else
{
long symsize;
long symbol_count;
symsize = bfd_get_symtab_upper_bound (abfd);
if (symsize < 0)
einfo (_("%B%F: could not read symbols: %E\n"), abfd);
asymbols = (asymbol **) xmalloc (symsize);
symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
if (symbol_count < 0)
einfo (_("%B%F: could not read symbols: %E\n"), abfd);
if (entry != NULL)
{
entry->asymbols = asymbols;
entry->symbol_count = symbol_count;
}
}
info.found = false;
info.warning = warning;
info.symbol = symbol;
info.asymbols = asymbols;
bfd_map_over_sections (abfd, warning_find_reloc, (PTR) &info);
if (! info.found)
einfo ("%B: %s\n", abfd, warning);
if (entry == NULL)
free (asymbols);
}
return true;
}
/* This is called by warning_callback for each section. It checks the
relocs of the section to see if it can find a reference to the
symbol which triggered the warning. If it can, it uses the reloc
to give an error message with a file and line number. */
static void
warning_find_reloc (abfd, sec, iarg)
bfd *abfd;
asection *sec;
PTR iarg;
{
struct warning_callback_info *info = (struct warning_callback_info *) iarg;
long relsize;
arelent **relpp;
long relcount;
arelent **p, **pend;
if (info->found)
return;
relsize = bfd_get_reloc_upper_bound (abfd, sec);
if (relsize < 0)
einfo (_("%B%F: could not read relocs: %E\n"), abfd);
if (relsize == 0)
return;
relpp = (arelent **) xmalloc (relsize);
relcount = bfd_canonicalize_reloc (abfd, sec, relpp, info->asymbols);
if (relcount < 0)
einfo (_("%B%F: could not read relocs: %E\n"), abfd);
p = relpp;
pend = p + relcount;
for (; p < pend && *p != NULL; p++)
{
arelent *q = *p;
if (q->sym_ptr_ptr != NULL
&& *q->sym_ptr_ptr != NULL
&& strcmp (bfd_asymbol_name (*q->sym_ptr_ptr), info->symbol) == 0)
{
/* We found a reloc for the symbol we are looking for. */
einfo ("%C: %s\n", abfd, sec, q->address, info->warning);
info->found = true;
break;
}
}
free (relpp);
}
/* This is called when an undefined symbol is found. */
static boolean
undefined_symbol (info, name, abfd, section, address, fatal)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *name;
bfd *abfd;
asection *section;
bfd_vma address;
boolean fatal ATTRIBUTE_UNUSED;
{
static char *error_name;
static unsigned int error_count;
#define MAX_ERRORS_IN_A_ROW 5
if (config.warn_once)
{
static struct bfd_hash_table *hash;
/* Only warn once about a particular undefined symbol. */
if (hash == NULL)
{
hash = ((struct bfd_hash_table *)
xmalloc (sizeof (struct bfd_hash_table)));
if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
}
if (bfd_hash_lookup (hash, name, false, false) != NULL)
return true;
if (bfd_hash_lookup (hash, name, true, true) == NULL)
einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));
}
/* We never print more than a reasonable number of errors in a row
for a single symbol. */
if (error_name != (char *) NULL
&& strcmp (name, error_name) == 0)
++error_count;
else
{
error_count = 0;
if (error_name != (char *) NULL)
free (error_name);
error_name = xstrdup (name);
}
if (section != NULL)
{
if (error_count < MAX_ERRORS_IN_A_ROW)
{
einfo (_("%C: undefined reference to `%T'\n"),
abfd, section, address, name);
if (fatal)
einfo ("%X");
}
else if (error_count == MAX_ERRORS_IN_A_ROW)
einfo (_("%D: more undefined references to `%T' follow\n"),
abfd, section, address, name);
}
else
{
if (error_count < MAX_ERRORS_IN_A_ROW)
{
einfo (_("%B: undefined reference to `%T'\n"),
abfd, name);
if (fatal)
einfo ("%X");
}
else if (error_count == MAX_ERRORS_IN_A_ROW)
einfo (_("%B: more undefined references to `%T' follow\n"),
abfd, name);
}
return true;
}
/* This is called when a reloc overflows. */
static boolean
reloc_overflow (info, name, reloc_name, addend, abfd, section, address)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *name;
const char *reloc_name;
bfd_vma addend;
bfd *abfd;
asection *section;
bfd_vma address;
{
if (abfd == (bfd *) NULL)
einfo (_("%P%X: generated"));
else
einfo ("%X%C:", abfd, section, address);
einfo (_(" relocation truncated to fit: %s %T"), reloc_name, name);
if (addend != 0)
einfo ("+%v", addend);
einfo ("\n");
return true;
}
/* This is called when a dangerous relocation is made. */
static boolean
reloc_dangerous (info, message, abfd, section, address)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *message;
bfd *abfd;
asection *section;
bfd_vma address;
{
if (abfd == (bfd *) NULL)
einfo (_("%P%X: generated"));
else
einfo ("%X%C:", abfd, section, address);
einfo (_("dangerous relocation: %s\n"), message);
return true;
}
/* This is called when a reloc is being generated attached to a symbol
that is not being output. */
static boolean
unattached_reloc (info, name, abfd, section, address)
struct bfd_link_info *info ATTRIBUTE_UNUSED;
const char *name;
bfd *abfd;
asection *section;
bfd_vma address;
{
if (abfd == (bfd *) NULL)
einfo (_("%P%X: generated"));
else
einfo ("%X%C:", abfd, section, address);
einfo (_(" reloc refers to symbol `%T' which is not being output\n"), name);
return true;
}
/* This is called if link_info.notice_all is set, or when a symbol in
link_info.notice_hash is found. Symbols are put in notice_hash
using the -y option. */
static boolean
notice (info, name, abfd, section, value)
struct bfd_link_info *info;
const char *name;
bfd *abfd;
asection *section;
bfd_vma value;
{
if (! info->notice_all
|| (info->notice_hash != NULL
&& bfd_hash_lookup (info->notice_hash, name, false, false) != NULL))
{
if (bfd_is_und_section (section))
einfo ("%B: reference to %s\n", abfd, name);
else
einfo ("%B: definition of %s\n", abfd, name);
}
if (command_line.cref || nocrossref_list != NULL)
add_cref (name, abfd, section, value);
return true;
}
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