old-cross-binutils/ld/ldfile.c
Alan Modra c38b10fa10 PR ld/10047
* ldfile.c (find_scripts_dir): Use make_relative_prefix to find
	ldscripts in build tree.  Don't repeat search for ../lib/ldscripts.
2009-04-14 03:17:21 +00:00

651 lines
16 KiB
C

/* Linker file opening and searching.
Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU Binutils.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "safe-ctype.h"
#include "ld.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldmain.h"
#include <ldgram.h>
#include "ldlex.h"
#include "ldemul.h"
#include "libiberty.h"
#include "filenames.h"
const char * ldfile_input_filename;
bfd_boolean ldfile_assumed_script = FALSE;
const char * ldfile_output_machine_name = "";
unsigned long ldfile_output_machine;
enum bfd_architecture ldfile_output_architecture;
search_dirs_type * search_head;
#ifdef VMS
static char * slash = "";
#else
#if defined (_WIN32) && ! defined (__CYGWIN32__)
static char * slash = "\\";
#else
static char * slash = "/";
#endif
#endif
typedef struct search_arch
{
char *name;
struct search_arch *next;
} search_arch_type;
static search_dirs_type **search_tail_ptr = &search_head;
static search_arch_type *search_arch_head;
static search_arch_type **search_arch_tail_ptr = &search_arch_head;
/* Test whether a pathname, after canonicalization, is the same or a
sub-directory of the sysroot directory. */
static bfd_boolean
is_sysrooted_pathname (const char *name, bfd_boolean notsame)
{
char * realname = ld_canon_sysroot ? lrealpath (name) : NULL;
int len;
bfd_boolean result;
if (! realname)
return FALSE;
len = strlen (realname);
if (((! notsame && len == ld_canon_sysroot_len)
|| (len >= ld_canon_sysroot_len
&& IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len])
&& (realname[ld_canon_sysroot_len] = '\0') == '\0'))
&& FILENAME_CMP (ld_canon_sysroot, realname) == 0)
result = TRUE;
else
result = FALSE;
if (realname)
free (realname);
return result;
}
/* Adds NAME to the library search path.
Makes a copy of NAME using xmalloc(). */
void
ldfile_add_library_path (const char *name, bfd_boolean cmdline)
{
search_dirs_type *new;
if (!cmdline && config.only_cmd_line_lib_dirs)
return;
new = xmalloc (sizeof (search_dirs_type));
new->next = NULL;
new->cmdline = cmdline;
*search_tail_ptr = new;
search_tail_ptr = &new->next;
/* If a directory is marked as honoring sysroot, prepend the sysroot path
now. */
if (name[0] == '=')
{
new->name = concat (ld_sysroot, name + 1, (const char *) NULL);
new->sysrooted = TRUE;
}
else
{
new->name = xstrdup (name);
new->sysrooted = is_sysrooted_pathname (name, FALSE);
}
}
/* Try to open a BFD for a lang_input_statement. */
bfd_boolean
ldfile_try_open_bfd (const char *attempt,
lang_input_statement_type *entry)
{
entry->the_bfd = bfd_openr (attempt, entry->target);
if (trace_file_tries)
{
if (entry->the_bfd == NULL)
info_msg (_("attempt to open %s failed\n"), attempt);
else
info_msg (_("attempt to open %s succeeded\n"), attempt);
}
if (entry->the_bfd == NULL)
{
if (bfd_get_error () == bfd_error_invalid_target)
einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);
return FALSE;
}
/* If we are searching for this file, see if the architecture is
compatible with the output file. If it isn't, keep searching.
If we can't open the file as an object file, stop the search
here. If we are statically linking, ensure that we don't link
a dynamic object. */
if (entry->search_dirs_flag || !entry->dynamic)
{
bfd *check;
if (bfd_check_format (entry->the_bfd, bfd_archive))
check = bfd_openr_next_archived_file (entry->the_bfd, NULL);
else
check = entry->the_bfd;
if (check != NULL)
{
if (! bfd_check_format (check, bfd_object))
{
if (check == entry->the_bfd
&& entry->search_dirs_flag
&& bfd_get_error () == bfd_error_file_not_recognized
&& ! ldemul_unrecognized_file (entry))
{
int token, skip = 0;
char *arg, *arg1, *arg2, *arg3;
extern FILE *yyin;
/* Try to interpret the file as a linker script. */
ldfile_open_command_file (attempt);
ldfile_assumed_script = TRUE;
parser_input = input_selected;
ldlex_both ();
token = INPUT_SCRIPT;
while (token != 0)
{
switch (token)
{
case OUTPUT_FORMAT:
if ((token = yylex ()) != '(')
continue;
if ((token = yylex ()) != NAME)
continue;
arg1 = yylval.name;
arg2 = NULL;
arg3 = NULL;
token = yylex ();
if (token == ',')
{
if ((token = yylex ()) != NAME)
{
free (arg1);
continue;
}
arg2 = yylval.name;
if ((token = yylex ()) != ','
|| (token = yylex ()) != NAME)
{
free (arg1);
free (arg2);
continue;
}
arg3 = yylval.name;
token = yylex ();
}
if (token == ')')
{
switch (command_line.endian)
{
default:
case ENDIAN_UNSET:
arg = arg1; break;
case ENDIAN_BIG:
arg = arg2 ? arg2 : arg1; break;
case ENDIAN_LITTLE:
arg = arg3 ? arg3 : arg1; break;
}
if (strcmp (arg, lang_get_output_target ()) != 0)
skip = 1;
}
free (arg1);
if (arg2) free (arg2);
if (arg3) free (arg3);
break;
case NAME:
case LNAME:
case VERS_IDENTIFIER:
case VERS_TAG:
free (yylval.name);
break;
case INT:
if (yylval.bigint.str)
free (yylval.bigint.str);
break;
}
token = yylex ();
}
ldlex_popstate ();
ldfile_assumed_script = FALSE;
fclose (yyin);
yyin = NULL;
if (skip)
{
if (command_line.warn_search_mismatch)
einfo (_("%P: skipping incompatible %s "
"when searching for %s\n"),
attempt, entry->local_sym_name);
bfd_close (entry->the_bfd);
entry->the_bfd = NULL;
return FALSE;
}
}
return TRUE;
}
if (!entry->dynamic && (entry->the_bfd->flags & DYNAMIC) != 0)
{
einfo (_("%F%P: attempted static link of dynamic object `%s'\n"),
attempt);
bfd_close (entry->the_bfd);
entry->the_bfd = NULL;
return FALSE;
}
if (entry->search_dirs_flag
&& !bfd_arch_get_compatible (check, link_info.output_bfd,
command_line.accept_unknown_input_arch)
/* XCOFF archives can have 32 and 64 bit objects. */
&& ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour
&& bfd_get_flavour (link_info.output_bfd) == bfd_target_xcoff_flavour
&& bfd_check_format (entry->the_bfd, bfd_archive)))
{
if (command_line.warn_search_mismatch)
einfo (_("%P: skipping incompatible %s "
"when searching for %s\n"),
attempt, entry->local_sym_name);
bfd_close (entry->the_bfd);
entry->the_bfd = NULL;
return FALSE;
}
}
}
return TRUE;
}
/* Search for and open the file specified by ENTRY. If it is an
archive, use ARCH, LIB and SUFFIX to modify the file name. */
bfd_boolean
ldfile_open_file_search (const char *arch,
lang_input_statement_type *entry,
const char *lib,
const char *suffix)
{
search_dirs_type *search;
/* If this is not an archive, try to open it in the current
directory first. */
if (! entry->is_archive)
{
if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename))
{
char *name = concat (ld_sysroot, entry->filename,
(const char *) NULL);
if (ldfile_try_open_bfd (name, entry))
{
entry->filename = name;
return TRUE;
}
free (name);
}
else if (ldfile_try_open_bfd (entry->filename, entry))
{
entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename)
&& is_sysrooted_pathname (entry->filename, TRUE);
return TRUE;
}
if (IS_ABSOLUTE_PATH (entry->filename))
return FALSE;
}
for (search = search_head; search != NULL; search = search->next)
{
char *string;
if (entry->dynamic && ! link_info.relocatable)
{
if (ldemul_open_dynamic_archive (arch, search, entry))
{
entry->sysrooted = search->sysrooted;
return TRUE;
}
}
if (entry->is_archive)
string = concat (search->name, slash, lib, entry->filename,
arch, suffix, (const char *) NULL);
else
string = concat (search->name, slash, entry->filename,
(const char *) 0);
if (ldfile_try_open_bfd (string, entry))
{
entry->filename = string;
entry->sysrooted = search->sysrooted;
return TRUE;
}
free (string);
}
return FALSE;
}
/* Open the input file specified by ENTRY. */
void
ldfile_open_file (lang_input_statement_type *entry)
{
if (entry->the_bfd != NULL)
return;
if (! entry->search_dirs_flag)
{
if (ldfile_try_open_bfd (entry->filename, entry))
return;
if (strcmp (entry->filename, entry->local_sym_name) != 0)
einfo (_("%F%P: %s (%s): No such file: %E\n"),
entry->filename, entry->local_sym_name);
else
einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name);
}
else
{
search_arch_type *arch;
bfd_boolean found = FALSE;
/* Try to open <filename><suffix> or lib<filename><suffix>.a */
for (arch = search_arch_head; arch != NULL; arch = arch->next)
{
found = ldfile_open_file_search (arch->name, entry, "lib", ".a");
if (found)
break;
#ifdef VMS
found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");
if (found)
break;
#endif
found = ldemul_find_potential_libraries (arch->name, entry);
if (found)
break;
}
/* If we have found the file, we don't need to search directories
again. */
if (found)
entry->search_dirs_flag = FALSE;
else if (entry->sysrooted
&& ld_sysroot
&& IS_ABSOLUTE_PATH (entry->local_sym_name))
einfo (_("%F%P: cannot find %s inside %s\n"),
entry->local_sym_name, ld_sysroot);
else
einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);
}
}
/* Try to open NAME; if that fails, try NAME with EXTEN appended to it. */
static FILE *
try_open (const char *name, const char *exten)
{
FILE *result;
result = fopen (name, "r");
if (trace_file_tries)
{
if (result == NULL)
info_msg (_("cannot find script file %s\n"), name);
else
info_msg (_("opened script file %s\n"), name);
}
if (result != NULL)
return result;
if (*exten)
{
char *buff;
buff = concat (name, exten, (const char *) NULL);
result = fopen (buff, "r");
if (trace_file_tries)
{
if (result == NULL)
info_msg (_("cannot find script file %s\n"), buff);
else
info_msg (_("opened script file %s\n"), buff);
}
free (buff);
}
return result;
}
/* Return TRUE iff directory DIR contains an "ldscripts" subdirectory. */
static bfd_boolean
check_for_scripts_dir (char *dir)
{
char *buf;
struct stat s;
bfd_boolean res;
buf = concat (dir, "/ldscripts", (const char *) NULL);
res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);
free (buf);
return res;
}
/* Return the default directory for finding script files.
We look for the "ldscripts" directory in:
SCRIPTDIR (passed from Makefile)
(adjusted according to the current location of the binary)
SCRIPTDIR (passed from Makefile)
the dir where this program is (for using it from the build tree). */
static char *
find_scripts_dir (void)
{
char *dir;
dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);
if (dir)
{
if (check_for_scripts_dir (dir))
return dir;
free (dir);
}
dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);
if (dir)
{
if (check_for_scripts_dir (dir))
return dir;
free (dir);
}
if (check_for_scripts_dir (SCRIPTDIR))
/* We've been installed normally. */
return SCRIPTDIR;
/* Look for "ldscripts" in the dir where our binary is. */
dir = make_relative_prefix (program_name, ".", ".");
if (dir)
{
if (check_for_scripts_dir (dir))
return dir;
free (dir);
}
return NULL;
}
/* If DEFAULT_ONLY is false, try to open NAME; if that fails, look for
it in directories specified with -L, then in the default script
directory, without and with EXTEND appended. If DEFAULT_ONLY is
true, the search is restricted to the default script location. */
static FILE *
ldfile_find_command_file (const char *name, const char *extend,
bfd_boolean default_only)
{
search_dirs_type *search;
FILE *result = NULL;
char *buffer;
static search_dirs_type *script_search;
if (!default_only)
{
/* First try raw name. */
result = try_open (name, "");
if (result != NULL)
return result;
}
if (!script_search)
{
char *script_dir = find_scripts_dir ();
if (script_dir)
{
search_dirs_type **save_tail_ptr = search_tail_ptr;
search_tail_ptr = &script_search;
ldfile_add_library_path (script_dir, TRUE);
search_tail_ptr = save_tail_ptr;
}
}
/* Temporarily append script_search to the path list so that the
paths specified with -L will be searched first. */
*search_tail_ptr = script_search;
/* Try now prefixes. */
for (search = default_only ? script_search : search_head;
search != NULL;
search = search->next)
{
buffer = concat (search->name, slash, name, (const char *) NULL);
result = try_open (buffer, extend);
free (buffer);
if (result)
break;
}
/* Restore the original path list. */
*search_tail_ptr = NULL;
return result;
}
/* Open command file NAME. */
static void
ldfile_open_command_file_1 (const char *name, bfd_boolean default_only)
{
FILE *ldlex_input_stack;
ldlex_input_stack = ldfile_find_command_file (name, "", default_only);
if (ldlex_input_stack == NULL)
{
bfd_set_error (bfd_error_system_call);
einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
}
lex_push_file (ldlex_input_stack, name);
ldfile_input_filename = name;
lineno = 1;
saved_script_handle = ldlex_input_stack;
}
/* Open command file NAME in the current directory, -L directories,
the default script location, in that order. */
void
ldfile_open_command_file (const char *name)
{
ldfile_open_command_file_1 (name, FALSE);
}
/* Open command file NAME at the default script location. */
void
ldfile_open_default_command_file (const char *name)
{
ldfile_open_command_file_1 (name, TRUE);
}
void
ldfile_add_arch (const char *in_name)
{
char *name = xstrdup (in_name);
search_arch_type *new = xmalloc (sizeof (search_arch_type));
ldfile_output_machine_name = in_name;
new->name = name;
new->next = NULL;
while (*name)
{
*name = TOLOWER (*name);
name++;
}
*search_arch_tail_ptr = new;
search_arch_tail_ptr = &new->next;
}
/* Set the output architecture. */
void
ldfile_set_output_arch (const char *string, enum bfd_architecture defarch)
{
const bfd_arch_info_type *arch = bfd_scan_arch (string);
if (arch)
{
ldfile_output_architecture = arch->arch;
ldfile_output_machine = arch->mach;
ldfile_output_machine_name = arch->printable_name;
}
else if (defarch != bfd_arch_unknown)
ldfile_output_architecture = defarch;
else
einfo (_("%P%F: cannot represent machine `%s'\n"), string);
}