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* emultempl/pe.em (gld_${EMULATION_NAME}_open_dynamic_archive): Restructure.

Browse Source 
Add native "%s.lib" format to search list
* ld.texinfo (node WIN32): Update documentation on dynamic lib search order.
   Add another reason for using import libs.
This commit is contained in:
Nick Clifton 2006-06-22 13:43:04 +00:00
parent 47c7e8efbb
commit 45e948fe97
3 changed files with 88 additions and 76 deletions
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7
ld/ChangeLog
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@ -1,3 +1,10 @@
2006-06-22 Danny Smith <dannysmith@users.sourceforge.net>
* emultempl/pe.em (gld_${EMULATION_NAME}_open_dynamic_archive):
Restructure. Add native "%s.lib" format to search list
* ld.texinfo (node WIN32): Update documentation on dynamic lib
search order. Add another reason for using import libs.
2006-06-21 Mark Shinwell <shinwell@codesourcery.com>
* ldlang.c (lang_insert_orphan): Correctly handle the case where

131
ld/emultempl/pe.em
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@ -11,7 +11,7 @@ rm -f e${EMULATION_NAME}.c
cat >>e${EMULATION_NAME}.c <<EOF
/* This file is part of GLD, the Gnu Linker.
Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
2005 Free Software Foundation, Inc.
2005, 2006 Free Software Foundation, Inc.
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
@ -1694,87 +1694,86 @@ gld_${EMULATION_NAME}_open_dynamic_archive
(const char *arch ATTRIBUTE_UNUSED, search_dirs_type *search,
lang_input_statement_type *entry)
{
static const struct
{
const char * format;
bfd_boolean use_prefix;
}
libname_fmt [] =
{
/* Preferred explicit import library for dll's. */
{ "lib%s.dll.a", FALSE },
/* Alternate explicit import library for dll's. */
{ "%s.dll.a", FALSE },
/* "libfoo.a" could be either an import lib or a static lib.
For backwards compatibility, libfoo.a needs to precede
libfoo.dll and foo.dll in the search. */
{ "lib%s.a", FALSE },
/* The 'native' spelling of an import lib name is "foo.lib". */
{ "%s.lib", FALSE },
#ifdef DLL_SUPPORT
/* Try "<prefix>foo.dll" (preferred dll name, if specified). */
{ "%s%s.dll", TRUE },
#endif
/* Try "libfoo.dll" (default preferred dll name). */
{ "lib%s.dll", FALSE },
/* Finally try 'native' dll name "foo.dll". */
{ "%s.dll", FALSE },
/* Note: If adding more formats to this table, make sure to check to
see if their length is longer than libname_fmt[0].format, and if
so, update the call to xmalloc() below. */
{ NULL, FALSE }
};
const char * filename;
char * string;
char * full_string;
char * base_string;
unsigned int i;
if (! entry->is_archive)
return FALSE;
filename = entry->filename;
string = (char *) xmalloc (strlen (search->name)
+ strlen (filename)
+ sizeof "/lib.a.dll"
full_string = xmalloc (strlen (search->name)
+ strlen (filename)
/* Allow space for the characters in the format
string. We actually allow 2 more bytes than
necessary, but this will not hurt. */
+ sizeof libname_fmt[0].format
#ifdef DLL_SUPPORT
+ (pe_dll_search_prefix ? strlen (pe_dll_search_prefix) : 0)
+ (pe_dll_search_prefix
? strlen (pe_dll_search_prefix) : 0)
#endif
+ 1);
+ 1);
/* Try "libfoo.dll.a" first (preferred explicit import library for dll's. */
sprintf (string, "%s/lib%s.dll.a", search->name, filename);
sprintf (full_string, "%s/", search->name);
base_string = full_string + strlen (full_string);
if (! ldfile_try_open_bfd (string, entry))
for (i = 0; libname_fmt[i].format; i++)
{
/* Try "foo.dll.a" next (alternate explicit import library for dll's. */
sprintf (string, "%s/%s.dll.a", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
#ifdef DLL_SUPPORT
if (libname_fmt[i].use_prefix)
{
/* Try libfoo.a next. Normally, this would be interpreted as a static
library, but it *could* be an import library. For backwards compatibility,
libfoo.a needs to ==precede== libfoo.dll and foo.dll in the search,
or sometimes errors occur when building legacy packages.
Putting libfoo.a here means that in a failure case (i.e. the library
-lfoo is not found) we will search for libfoo.a twice before
giving up -- once here, and once when searching for a "static" lib.
for a "static" lib. */
/* Try "libfoo.a" (import lib, or static lib, but must
take precedence over dll's). */
sprintf (string, "%s/lib%s.a", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
{
#ifdef DLL_SUPPORT
if (pe_dll_search_prefix)
{
/* Try "<prefix>foo.dll" (preferred dll name, if specified). */
sprintf (string, "%s/%s%s.dll", search->name, pe_dll_search_prefix, filename);
if (! ldfile_try_open_bfd (string, entry))
{
/* Try "libfoo.dll" (default preferred dll name). */
sprintf (string, "%s/lib%s.dll", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
{
/* Finally, try "foo.dll" (alternate dll name). */
sprintf (string, "%s/%s.dll", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
{
free (string);
return FALSE;
}
}
}
}
else /* pe_dll_search_prefix not specified. */
#endif
{
/* Try "libfoo.dll" (preferred dll name). */
sprintf (string, "%s/lib%s.dll", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
{
/* Finally, try "foo.dll" (alternate dll name). */
sprintf (string, "%s/%s.dll", search->name, filename);
if (! ldfile_try_open_bfd (string, entry))
{
free (string);
return FALSE;
}
}
}
}
if (!pe_dll_search_prefix)
continue;
sprintf (base_string, libname_fmt[i].format, pe_dll_search_prefix, filename);
}
else
#endif
sprintf (base_string, libname_fmt[i].format, filename);
if (ldfile_try_open_bfd (full_string, entry))
break;
}
entry->filename = string;
if (!libname_fmt[i].format)
{
free (full_string);
return FALSE;
}
entry->filename = full_string;
return TRUE;
}

26
ld/ld.texinfo
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@ -1,7 +1,7 @@
\input texinfo
@setfilename ld.info
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
@c 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
@c 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
@syncodeindex ky cp
@c man begin INCLUDE
@include configdoc.texi
@ -64,7 +64,7 @@ END-INFO-DIR-ENTRY
This file documents the @sc{gnu} linker LD version @value{VERSION}.
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000,
2001, 2002, 2003, 2004 Free Software Foundation, Inc.
2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
@ignore
@ -109,7 +109,7 @@ notice identical to this one except for the removal of this paragraph
@vskip 0pt plus 1filll
@c man begin COPYRIGHT
Copyright @copyright{} 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001,
2002, 2003, 2004 Free Software Foundation, Inc.
2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1
@ -5984,12 +5984,13 @@ For instance, when ld is called with the argument @samp{-lxxx} it will attempt
to find, in the first directory of its search path,
@example
libxxx.dll.a
xxx.dll.a
libxxx.a
libxxx.dll.a
xxx.dll.a
libxxx.a
xxx.lib
cygxxx.dll (*)
libxxx.dll
xxx.dll
libxxx.dll
xxx.dll
@end example
before moving on to the next directory in the search path.
@ -6061,7 +6062,7 @@ even when auto-import features are exercised, and even when
@samp{--enable-runtime-pseudo-relocs} is used.
Given the improvements in speed and memory usage, one might justifiably
wonder why import libraries are used at all. There are two reasons:
wonder why import libraries are used at all. There are three reasons:
1. Until recently, the link-directly-to-dll functionality did @emph{not}
work with auto-imported data.
@ -6072,9 +6073,14 @@ symbols that point to the exports of a dll). Again, the import lib
for the cygwin kernel makes use of this ability, and it is not
possible to do this without an import lib.
3. Symbol aliases can only be resolved using an import lib. This is
critical when linking against OS-supplied dll's (eg, the win32 API)
in which symbols are usually exported as undecorated aliases of their
stdcall-decorated assembly names.
So, import libs are not going away. But the ability to replace
true import libs with a simple symbolic link to (or a copy of)
a dll, in most cases, is a useful addition to the suite of tools
a dll, in many cases, is a useful addition to the suite of tools
binutils makes available to the win32 developer. Given the
massive improvements in memory requirements during linking, storage
requirements, and linking speed, we expect that many developers