/* Main program of GNU linker.
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+ 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Written by Steve Chamberlain steve@cygnus.com
#include "ldfile.h"
#include "ldemul.h"
#include "ldctor.h"
+#ifdef ENABLE_PLUGINS
+#include "plugin.h"
+#include "plugin-api.h"
+#include "libbfd.h"
+#endif /* ENABLE_PLUGINS */
/* Somewhere above, sys/stat.h got included. */
#if !defined(S_ISDIR) && defined(S_IFDIR)
/* Nonzero means link in every member of an archive. */
bfd_boolean whole_archive;
-/* Nonzero means create DT_NEEDED entries only if a dynamic library
- actually satisfies some reference in a regular object. */
-bfd_boolean as_needed;
+/* True means only create DT_NEEDED entries for dynamic libraries
+ if they actually satisfy some reference in a regular object. */
+bfd_boolean add_DT_NEEDED_for_regular;
-/* Nonzero means never create DT_NEEDED entries for dynamic libraries
- in DT_NEEDED tags. */
-bfd_boolean add_needed = TRUE;
+/* True means create DT_NEEDED entries for dynamic libraries that
+ are DT_NEEDED by dynamic libraries specifically mentioned on
+ the command line. */
+bfd_boolean add_DT_NEEDED_for_dynamic = TRUE;
/* TRUE if we should demangle symbol names. */
bfd_boolean demangling;
static char *get_emulation
(int, char **);
static bfd_boolean add_archive_element
- (struct bfd_link_info *, bfd *, const char *);
+ (struct bfd_link_info *, bfd *, const char *, bfd **);
static bfd_boolean multiple_definition
- (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma,
+ (struct bfd_link_info *, struct bfd_link_hash_entry *,
bfd *, asection *, bfd_vma);
static bfd_boolean multiple_common
- (struct bfd_link_info *, const char *, bfd *, enum bfd_link_hash_type,
- bfd_vma, bfd *, enum bfd_link_hash_type, bfd_vma);
+ (struct bfd_link_info *, struct bfd_link_hash_entry *,
+ bfd *, enum bfd_link_hash_type, bfd_vma);
static bfd_boolean add_to_set
(struct bfd_link_info *, struct bfd_link_hash_entry *,
bfd_reloc_code_real_type, bfd *, asection *, bfd_vma);
static bfd_boolean unattached_reloc
(struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
static bfd_boolean notice
- (struct bfd_link_info *, const char *, bfd *, asection *, bfd_vma);
+ (struct bfd_link_info *, struct bfd_link_hash_entry *,
+ bfd *, asection *, bfd_vma);
static struct bfd_link_callbacks link_callbacks =
{
struct bfd_link_info link_info;
\f
static void
-remove_output (void)
+ld_cleanup (void)
{
- if (output_filename)
- {
- if (link_info.output_bfd)
- bfd_cache_close (link_info.output_bfd);
- if (delete_output_file_on_failure)
- unlink_if_ordinary (output_filename);
- }
+ bfd_cache_close_all ();
+#ifdef ENABLE_PLUGINS
+ plugin_call_cleanup ();
+#endif
+ if (output_filename && delete_output_file_on_failure)
+ unlink_if_ordinary (output_filename);
}
int
bfd_set_error_program_name (program_name);
- xatexit (remove_output);
+ xatexit (ld_cleanup);
/* Set up the sysroot directory. */
ld_sysroot = get_sysroot (argc, argv);
command_line.warn_mismatch = TRUE;
command_line.warn_search_mismatch = TRUE;
command_line.check_section_addresses = -1;
+ command_line.disable_target_specific_optimizations = -1;
/* We initialize DEMANGLING based on the environment variable
COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the
#endif
long run_time = get_run_time () - start_time;
+ fflush (stdout);
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
+ fflush (stderr);
}
/* Prevent remove_output from doing anything, after a successful link. */
static bfd_boolean
add_archive_element (struct bfd_link_info *info,
bfd *abfd,
- const char *name)
+ const char *name,
+ bfd **subsbfd ATTRIBUTE_UNUSED)
{
lang_input_statement_type *input;
+ lang_input_statement_type orig_input;
input = (lang_input_statement_type *)
xcalloc (1, sizeof (lang_input_statement_type));
input->local_sym_name = abfd->filename;
input->the_bfd = abfd;
+ /* Save the original data for trace files/tries below, as plugins
+ (if enabled) may possibly alter it to point to a replacement
+ BFD, but we still want to output the original BFD filename. */
+ orig_input = *input;
+#ifdef ENABLE_PLUGINS
+ if (bfd_my_archive (abfd) != NULL
+ && plugin_active_plugins_p ()
+ && !no_more_claiming)
+ {
+ /* We must offer this archive member to the plugins to claim. */
+ int fd = open (bfd_my_archive (abfd)->filename, O_RDONLY | O_BINARY);
+ if (fd >= 0)
+ {
+ struct ld_plugin_input_file file;
+
+ /* Offset and filesize must refer to the individual archive
+ member, not the whole file, and must exclude the header.
+ Fortunately for us, that is how the data is stored in the
+ origin field of the bfd and in the arelt_data. */
+ file.name = bfd_my_archive (abfd)->filename;
+ file.offset = abfd->origin;
+ file.filesize = arelt_size (abfd);
+ file.fd = fd;
+ plugin_maybe_claim (&file, input);
+ if (input->claimed)
+ {
+ input->claim_archive = TRUE;
+ *subsbfd = input->the_bfd;
+ }
+ }
+ }
+#endif /* ENABLE_PLUGINS */
+
ldlang_add_file (input);
if (config.map_file != NULL)
}
if (trace_files || trace_file_tries)
- info_msg ("%I\n", input);
-
+ info_msg ("%I\n", &orig_input);
return TRUE;
}
multiple times. */
static bfd_boolean
-multiple_definition (struct bfd_link_info *info ATTRIBUTE_UNUSED,
- const char *name,
- bfd *obfd,
- asection *osec,
- bfd_vma oval,
+multiple_definition (struct bfd_link_info *info,
+ struct bfd_link_hash_entry *h,
bfd *nbfd,
asection *nsec,
bfd_vma nval)
{
+ const char *name;
+ bfd *obfd;
+ asection *osec;
+ bfd_vma oval;
+
+ if (info->allow_multiple_definition)
+ return TRUE;
+
+ switch (h->type)
+ {
+ case bfd_link_hash_defined:
+ osec = h->u.def.section;
+ oval = h->u.def.value;
+ obfd = h->u.def.section->owner;
+ break;
+ case bfd_link_hash_indirect:
+ osec = bfd_ind_section_ptr;
+ oval = 0;
+ obfd = NULL;
+ break;
+ default:
+ abort ();
+ }
+
+ /* Ignore a redefinition of an absolute symbol to the
+ same value; it's harmless. */
+ if (h->type == bfd_link_hash_defined
+ && bfd_is_abs_section (osec)
+ && bfd_is_abs_section (nsec)
+ && nval == oval)
+ return TRUE;
+
/* 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.
&& bfd_is_abs_section (nsec->output_section)))
return TRUE;
+ name = h->root.string;
+ if (nbfd == NULL)
+ {
+ nbfd = obfd;
+ nsec = osec;
+ nval = oval;
+ obfd = NULL;
+ }
einfo (_("%X%C: multiple definition of `%T'\n"),
nbfd, nsec, nval, name);
if (obfd != NULL)
einfo (_("%D: first defined here\n"), obfd, osec, oval);
- if (command_line.relax)
+ if (RELAXATION_ENABLED)
{
einfo (_("%P: Disabling relaxation: it will not work with multiple definitions\n"));
- command_line.relax = 0;
+ command_line.disable_target_specific_optimizations = -1;
}
return TRUE;
static bfd_boolean
multiple_common (struct bfd_link_info *info ATTRIBUTE_UNUSED,
- const char *name,
- bfd *obfd,
- enum bfd_link_hash_type otype,
- bfd_vma osize,
+ struct bfd_link_hash_entry *h,
bfd *nbfd,
enum bfd_link_hash_type ntype,
bfd_vma nsize)
{
- if (! config.warn_common)
+ const char *name;
+ bfd *obfd;
+ enum bfd_link_hash_type otype;
+ bfd_vma osize;
+
+ if (!config.warn_common)
return TRUE;
+ name = h->root.string;
+ otype = h->type;
+ if (otype == bfd_link_hash_common)
+ {
+ obfd = h->u.c.p->section->owner;
+ osize = h->u.c.size;
+ }
+ else if (otype == bfd_link_hash_defined
+ || otype == bfd_link_hash_defweak)
+ {
+ obfd = h->u.def.section->owner;
+ osize = 0;
+ }
+ else
+ {
+ /* FIXME: It would nice if we could report the BFD which defined
+ an indirect symbol, but we don't have anywhere to store the
+ information. */
+ obfd = NULL;
+ osize = 0;
+ }
+
if (ntype == bfd_link_hash_defined
|| ntype == bfd_link_hash_defweak
|| ntype == bfd_link_hash_indirect)
einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
else
{
- struct warning_callback_info info;
+ struct warning_callback_info cinfo;
/* Look through the relocs to see if we can find a plausible
address. */
if (!bfd_generic_link_read_symbols (abfd))
einfo (_("%B%F: could not read symbols: %E\n"), abfd);
- info.found = FALSE;
- info.warning = warning;
- info.symbol = symbol;
- info.asymbols = bfd_get_outsymbols (abfd);
- bfd_map_over_sections (abfd, warning_find_reloc, &info);
+ cinfo.found = FALSE;
+ cinfo.warning = warning;
+ cinfo.symbol = symbol;
+ cinfo.asymbols = bfd_get_outsymbols (abfd);
+ bfd_map_over_sections (abfd, warning_find_reloc, &cinfo);
- if (! info.found)
+ if (! cinfo.found)
einfo ("%B: %s%s\n", abfd, _("warning: "), warning);
}
/* 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. */
+ using the -y option, while notice_all is set if the --cref option
+ has been supplied, or if there are any NOCROSSREFS sections in the
+ linker script; and if plugins are active, since they need to monitor
+ all references from non-IR files. */
static bfd_boolean
notice (struct bfd_link_info *info,
- const char *name,
+ struct bfd_link_hash_entry *h,
bfd *abfd,
asection *section,
bfd_vma value)
{
- if (name == NULL)
+ const char *name;
+
+ if (h == NULL)
{
if (command_line.cref || nocrossref_list != NULL)
return handle_asneeded_cref (abfd, (enum notice_asneeded_action) value);
return TRUE;
}
- if (! info->notice_all
- || (info->notice_hash != NULL
- && bfd_hash_lookup (info->notice_hash, name, FALSE, FALSE) != NULL))
+ name = h->root.string;
+ if (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);
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