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Re: Discussion about merging Go frontend


On 03/11/2010 05:10, Dave Korn wrote:

>   :) I see our emails crossed in the ether.  Just preparing a (hopefully
> final!) spin.

  This is underway on the cfarm.  No changes to the previous changelogs with
this revision.

    cheers,
      DaveK

Index: configure.ac
===================================================================
--- configure.ac	(revision 166214)
+++ configure.ac	(working copy)
@@ -1656,149 +1656,12 @@ AC_ARG_ENABLE(lto,
 enable_lto=$enableval,
 enable_lto=yes; default_enable_lto=yes)
 
-
-ACX_ELF_TARGET_IFELSE([if test x"$enable_lto" = x"yes" ; then
-  # Make sure that libelf.h and gelf.h are available.
-  AC_ARG_WITH(libelf, [  --with-libelf=PATH       Specify prefix directory for the installed libelf package
-                          Equivalent to --with-libelf-include=PATH/include
-                          plus --with-libelf-lib=PATH/lib])
-
-  AC_ARG_WITH(libelf_include, [  --with-libelf-include=PATH Specify directory for installed libelf include files])
-
-  AC_ARG_WITH(libelf_lib, [  --with-libelf-lib=PATH   Specify the directory for the installed libelf library])
-
-  saved_CFLAGS="$CFLAGS"
-  saved_CPPFLAGS="$CPPFLAGS"
-  saved_LIBS="$LIBS"
-
-  case $with_libelf in 
-    "")
-      libelflibs="-lelf"
-      libelfinc="-I/usr/include/libelf"
-      ;;
-    *)
-      libelflibs="-L$with_libelf/lib -lelf"
-      libelfinc="-I$with_libelf/include -I$with_libelf/include/libelf"
-      LIBS="$libelflibs $LIBS"
-      ;;
-  esac
-
-  if test "x$with_libelf_include" != x; then
-    libelfinc="-I$with_libelf_include"
-  fi
-
-  if test "x$with_libelf_lib" != x; then
-    libelflibs="-L$with_libelf_lib -lelf"
-    LIBS="$libelflibs $LIBS"
-  fi
-
-  if test "x$with_libelf$with_libelf_include$with_libelf_lib" = x \
-     && test -d ${srcdir}/libelf; then
-    libelflibs='-L$$r/$(HOST_SUBDIR)/libelf/lib -lelf '
-    libelfinc='-D__LIBELF_INTERNAL__ -I$$r/$(HOST_SUBDIR)/libelf/lib -I$$s/libelf/lib'
-    LIBS="$libelflibs $LIBS"
-
- else
-
-  CFLAGS="$CFLAGS $libelfinc"
-  CPPFLAGS="$CPPFLAGS $libelfinc"
-  LIBS="$LIBS $libelflibs"
-
-  AC_CHECK_HEADERS(libelf.h, [have_libelf_h=yes])
-  AC_CHECK_HEADERS(gelf.h, [have_gelf_h=yes])
-
-  AC_CHECK_HEADERS(libelf/libelf.h, [have_libelf_libelf_h=yes])
-  AC_CHECK_HEADERS(libelf/gelf.h, [have_libelf_gelf_h=yes])
-
-  # If we couldn't find libelf.h and the user forced it, emit an error.
-  if test x"$have_libelf_h" != x"yes" \
-     && test x"$have_libelf_libelf_h" != x"yes" ; then
-    if test x"$default_enable_lto" != x"yes" ; then
-      AC_MSG_ERROR([LTO support requires libelf.h or libelf/libelf.h.])
-    else
-      enable_lto=no
-      libelflibs=
-      libelfinc=
-    fi
-  fi
-
-  # If we couldn't find gelf.h and the user forced it, emit an error.
-  if test x"$have_gelf_h" != x"yes" \
-     && test x"$have_libelf_gelf_h" != x"yes" ; then
-    if test x"$default_enable_lto" != x"yes" ; then
-      AC_MSG_ERROR([LTO support requires gelf.h or libelf/gelf.h.])
-    else
-      enable_lto=no
-      libelflibs=
-      libelfinc=
-    fi
-  fi
-
-  # Check that the detected libelf has the functions we need.  We cannot
-  # rely on just detecting the headers since they do not include 
-  # versioning information.  Add functions, if needed.
-  if test x"$enable_lto" = x"yes" ; then
-    AC_MSG_CHECKING([for the correct version of libelf])
-    AC_TRY_LINK(
-      [#include <libelf.h>],[
-      elf_errmsg (0);
-      elf_getscn (0, 0);
-      elf_nextscn (0, 0);
-      elf_strptr (0, 0, 0);
-      elf_getident (0, 0);
-      elf_begin (0, 0, 0);
-      elf_ndxscn (0);
-      elf_end (0);
-      ],
-      [AC_MSG_RESULT([yes]);],
-      [AC_MSG_RESULT([no]); enable_lto=no; libelflibs= ; libelfinc= ]
-    )
-
-    # Check for elf_getshdrstrndx or elf_getshstrndx.  The latter's flavor
-    # is determined in gcc/configure.ac.
-    if test x"$enable_lto" = x"yes" ; then
-      AC_MSG_CHECKING([for elf_getshdrstrndx])
-      AC_TRY_LINK(
-        [#include <libelf.h>],[
-	elf_getshdrstrndx (0, 0);
-        ],
-        [AC_MSG_RESULT([yes]);],
-        [AC_MSG_RESULT([no]);
-	 AC_MSG_CHECKING([for elf_getshstrndx])
-         AC_TRY_LINK(
-           [#include <libelf.h>],[
-	   elf_getshstrndx (0, 0);
-           ],
-           [AC_MSG_RESULT([yes]);],
-           [AC_MSG_RESULT([no]); enable_lto=no; libelflibs= ; libelfinc= ]
-         )]
-      )
-    fi
-
-    # If we couldn't enable LTO and the user forced it, emit an error.
-    if test x"$enable_lto" = x"no" \
-       && test x"$default_enable_lto" != x"yes" ; then
-      AC_MSG_ERROR([To enable LTO, GCC requires libelf v0.8.12+.
-Try the --with-libelf, --with-libelf-include and --with-libelf-lib options
-to specify its location.])
-    fi
-  fi
-
-  CFLAGS="$saved_CFLAGS"
-  CPPFLAGS="$saved_CPPFLAGS"
-  LIBS="$saved_LIBS"
-
- fi
-
-  # Flags needed for libelf.
-  AC_SUBST(libelflibs)
-  AC_SUBST(libelfinc)
-  # ELF platforms build the lto-plugin when GOLD is in use.
-  build_lto_plugin=${ENABLE_GOLD}
-fi],[if test x"$default_enable_lto" = x"yes" ; then
+ACX_ELF_TARGET_IFELSE([# ELF platforms build the lto-plugin always.
+  build_lto_plugin=yes
+],[if test x"$default_enable_lto" = x"yes" ; then
     case $target in
       *-apple-darwin* | *-cygwin* | *-mingw*) ;;
-      # On other non-ELF platforms, LTO must be explicitly enabled.
+      # On other non-ELF platforms, LTO has yet to be validated.
       *) enable_lto=no ;;
     esac
   else
@@ -1816,11 +1679,12 @@ enable_lto=yes; default_enable_lto=yes)
     esac
   fi
   # Among non-ELF, only Windows platforms support the lto-plugin so far.
+  # Build it unless LTO was explicitly disabled.
   case $target in
-    *-cygwin* | *-mingw*) build_lto_plugin=yes ;;
+    *-cygwin* | *-mingw*) build_lto_plugin=$enable_lto ;;
     *) ;;
   esac
-  default_enable_lto=no])
+])
 
 
 # By default, C is the only stage 1 language.
Index: lto-plugin/lto-plugin-elf.c
===================================================================
--- lto-plugin/lto-plugin-elf.c	(revision 166214)
+++ lto-plugin/lto-plugin-elf.c	(working copy)
@@ -1,157 +0,0 @@
-/* LTO plugin for gold.
-   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
-   Contributed by Rafael Avila de Espindola (espindola@google.com).
-
-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, 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; see the file COPYING3.  If not see
-<http://www.gnu.org/licenses/>.  */
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <libiberty.h>
-#include <stdlib.h>
-#include <inttypes.h>
-
-/* The presence of gelf.h is checked by the toplevel configure script.  */
-#include <gelf.h>
-
-/* Common definitions that the object format dependent code needs.  */
-#include "lto-plugin.h"
-
-/* Process all lto symtabs of file ELF. */
-
-static int
-process_symtab (Elf *elf, struct plugin_symtab *out)
-{
-  int found = 0;
-  Elf_Scn *section = 0;
-  GElf_Ehdr header;
-  GElf_Ehdr *t = gelf_getehdr (elf, &header);
-  if (t == NULL)
-    return 0;
-  assert (t == &header);
-
-  while ((section = elf_nextscn(elf, section)) != 0)
-    {
-      GElf_Shdr shdr;
-      GElf_Shdr *tshdr = gelf_getshdr (section, &shdr);
-      Elf_Data *symtab;
-      const char *t;
-      assert (tshdr == &shdr);
-      t = elf_strptr (elf, header.e_shstrndx, shdr.sh_name);
-      assert (t != NULL);
-      if (strncmp (t, LTO_SECTION_PREFIX, strlen (LTO_SECTION_PREFIX)) == 0) 
-	{
-	  char *s = strrchr (t, '.');
-	  if (s)
-	      sscanf (s, ".%x", &out->id);
-	  symtab = elf_getdata (section, NULL);
-	  translate (symtab->d_buf, symtab->d_buf + symtab->d_size, out);
-	  found++;
-	}
-    }
-  return found;
-}
-
-/* Callback used by gold to check if the plugin will claim FILE. Writes
-   the result in CLAIMED. */
-
-enum ld_plugin_status
-claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
-{
-  enum ld_plugin_status status;
-  Elf *elf;
-  struct plugin_file_info lto_file;
-  int n;
-
-  memset (&lto_file, 0, sizeof (struct plugin_file_info));
-
-  if (file->offset != 0)
-    {
-      char *objname;
-      Elf *archive;
-      off_t offset;
-      /* We pass the offset of the actual file, not the archive header. */
-      int t = asprintf (&objname, "%s@0x%" PRIx64, file->name,
-                        (int64_t) file->offset);
-      check (t >= 0, LDPL_FATAL, "asprintf failed");
-      lto_file.name = objname;
-
-      archive = elf_begin (file->fd, ELF_C_READ, NULL);
-      check (elf_kind (archive) == ELF_K_AR, LDPL_FATAL,
-             "Not an archive and offset not 0");
-
-      /* elf_rand expects the offset to point to the ar header, not the
-         object itself. Subtract the size of the ar header (60 bytes).
-         We don't uses sizeof (struct ar_hd) to avoid including ar.h */
-
-      offset = file->offset - 60;
-      check (offset == elf_rand (archive, offset), LDPL_FATAL,
-             "could not seek in archive");
-      elf = elf_begin (file->fd, ELF_C_READ, archive);
-      check (elf != NULL, LDPL_FATAL, "could not find archive member");
-      elf_end (archive);
-    }
-  else
-    {
-      lto_file.name = xstrdup (file->name);
-      elf = elf_begin (file->fd, ELF_C_READ, NULL);
-    }
-  lto_file.handle = file->handle;
-
-  *claimed = 0;
-
-  if (!elf)
-    goto err;
-
-  n = process_symtab (elf, &lto_file.symtab);
-  if (n == 0)
-    goto err;
-
-  if (n > 1)
-    resolve_conflicts (&lto_file.symtab, &lto_file.conflicts);
-
-  status = add_symbols (file->handle, lto_file.symtab.nsyms,
-			lto_file.symtab.syms);
-  check (status == LDPS_OK, LDPL_FATAL, "could not add symbols");
-
-  *claimed = 1;
-  num_claimed_files++;
-  claimed_files =
-    xrealloc (claimed_files,
-	      num_claimed_files * sizeof (struct plugin_file_info));
-  claimed_files[num_claimed_files - 1] = lto_file;
-
-  goto cleanup;
-
- err:
-  free (lto_file.name);
-
- cleanup:
-  if (elf)
-    elf_end (elf);
-
-  return LDPS_OK;
-}
-
-/* Method called first thing at onload time to perform sanity checks.  */
-
-enum ld_plugin_status
-onload_format_checks (struct ld_plugin_tv *tv)
-{
-  unsigned version = elf_version (EV_CURRENT);
-  check (version != EV_NONE, LDPL_FATAL, "invalid ELF version");
-  return LDPS_OK;
-}
-
Index: lto-plugin/lto-plugin.h
===================================================================
--- lto-plugin/lto-plugin.h	(revision 166214)
+++ lto-plugin/lto-plugin.h	(working copy)
@@ -1,84 +0,0 @@
-/* Common declarations for LTO plugin for gold and/or GNU ld.
-   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
-   Contributed by Rafael Avila de Espindola (espindola@google.com).
-
-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, 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; see the file COPYING3.  If not see
-<http://www.gnu.org/licenses/>.  */
-
-#include <stdbool.h>
-#include "plugin-api.h"
-
-/* LTO magic section name.  */
-
-#define LTO_SECTION_PREFIX ".gnu.lto_.symtab"
-
-/* The part of the symbol table the plugin has to keep track of. Note that we
-   must keep SYMS until all_symbols_read is called to give the linker time to
-   copy the symbol information. */
-
-struct sym_aux
-{
-  uint32_t slot;
-  unsigned id;
-  unsigned next_conflict;
-};
-
-struct plugin_symtab
-{
-  int nsyms;
-  struct sym_aux *aux;
-  struct ld_plugin_symbol *syms;
-  unsigned id;
-};
-
-/* All that we have to remember about a file. */
-
-struct plugin_file_info
-{
-  char *name;
-  void *handle;
-  struct plugin_symtab symtab;
-  struct plugin_symtab conflicts;
-};
-
-/* These are the methods supplied by one of the object format
-   dependent files lto-plugin-elf.c or lto-plugin-coff.c  */
-
-extern enum ld_plugin_status claim_file_handler 
-		(const struct ld_plugin_input_file *file, int *claimed);
-
-extern enum ld_plugin_status onload_format_checks (struct ld_plugin_tv *tv);
-
-/* These methods are made available to the object format
-   dependent files.  */
-
-extern void check (bool gate, enum ld_plugin_level level, const char *text);
-
-extern void translate (char *data, char *end, struct plugin_symtab *out);
-
-extern char *parse_table_entry (char *p, struct ld_plugin_symbol *entry,
-			struct sym_aux *aux);
-
-extern void resolve_conflicts (struct plugin_symtab *t,
-			struct plugin_symtab *conflicts);
-
-/* And this callback function is exposed.  */
-
-extern ld_plugin_add_symbols add_symbols;
-
-/* Along with these two variables.  */
-
-extern struct plugin_file_info *claimed_files;
-extern unsigned int num_claimed_files;
-
Index: lto-plugin/config.h.in
===================================================================
--- lto-plugin/config.h.in	(revision 0)
+++ lto-plugin/config.h.in	(revision 0)
@@ -0,0 +1,80 @@
+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+#undef HAVE_DLFCN_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Default symbol style */
+#undef SYM_STYLE
+
+/* Version number of package */
+#undef VERSION
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+#undef _FILE_OFFSET_BITS
+
+/* Define for large files, on AIX-style hosts. */
+#undef _LARGE_FILES
+
+/* Define for Solaris 2.5.1 so the uint64_t typedef from <sys/synch.h>,
+   <pthread.h>, or <semaphore.h> is not used. If the typedef were allowed, the
+   #define below would cause a syntax error. */
+#undef _UINT64_T
+
+/* Define to the type of an unsigned integer type of width exactly 64 bits if
+   such a type exists and the standard includes do not define it. */
+#undef uint64_t
Index: lto-plugin/configure
===================================================================
--- lto-plugin/configure	(revision 166214)
+++ lto-plugin/configure	(working copy)
@@ -601,7 +601,6 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
-LTO_FORMAT
 target_noncanonical
 CPP
 OTOOL64
@@ -622,8 +621,6 @@ EGREP
 GREP
 SED
 LIBTOOL
-LIBELFINC
-LIBELFLIBS
 am__fastdepCC_FALSE
 am__fastdepCC_TRUE
 CCDEPMODE
@@ -742,8 +739,6 @@ CFLAGS
 LDFLAGS
 LIBS
 CPPFLAGS
-LIBELFLIBS
-LIBELFINC
 CPP'
 
 
@@ -1392,8 +1387,6 @@ Some influential environment variables:
   LIBS        libraries to pass to the linker, e.g. -l<library>
   CPPFLAGS    C/C++/Objective C preprocessor flags, e.g. -I<include dir> if
               you have headers in a nonstandard directory <include dir>
-  LIBELFLIBS  How to link libelf
-  LIBELFINC   How to find libelf include files
   CPP         C preprocessor
 
 Use these variables to override the choices made by `configure' or to help
@@ -3975,8 +3968,6 @@ rm -rf conftest*
   fi
 fi
 
-
-
 case `pwd` in
   *\ * | *\	*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Libtool does not cope well with whitespace in \`pwd\`" >&5
@@ -10443,7 +10434,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10446 "configure"
+#line 10437 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10549,7 +10540,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10552 "configure"
+#line 10543 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10787,14 +10778,24 @@ CC="$lt_save_CC"
 
 
 
-. ${srcdir}/../gcc/config.gcc
-case ${lto_binary_reader} in
-  *coff*) LTO_FORMAT=coff ;;
-  *elf*)  LTO_FORMAT=elf ;;
-  *) as_fn_error "LTO plugin is not supported on this target." "$LINENO" 5 ;;
-esac
+# Trying to get this information from gcc's config is tricky.
+case $target in
+  x86_64*-mingw*)
 
+$as_echo "#define SYM_STYLE ss_none" >>confdefs.h
 
+    ;;
+  *-cygwin* | i?86*-mingw* )
+
+$as_echo "#define SYM_STYLE ss_win32" >>confdefs.h
+
+    ;;
+  *)
+
+$as_echo "#define SYM_STYLE ss_none" >>confdefs.h
+
+    ;;
+esac
 ac_fn_c_find_uintX_t "$LINENO" "64" "ac_cv_c_uint64_t"
 case $ac_cv_c_uint64_t in #(
   no|yes) ;; #(
@@ -10811,6 +10812,8 @@ _ACEOF
 
 ac_config_files="$ac_config_files Makefile"
 
+ac_config_headers="$ac_config_headers config.h"
+
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure
@@ -10890,44 +10893,8 @@ test "x$prefix" = xNONE && prefix=$ac_default_pref
 # Let make expand exec_prefix.
 test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
 
-# Transform confdefs.h into DEFS.
-# Protect against shell expansion while executing Makefile rules.
-# Protect against Makefile macro expansion.
-#
-# If the first sed substitution is executed (which looks for macros that
-# take arguments), then branch to the quote section.  Otherwise,
-# look for a macro that doesn't take arguments.
-ac_script='
-:mline
-/\\$/{
- N
- s,\\\n,,
- b mline
-}
-t clear
-:clear
-s/^[	 ]*#[	 ]*define[	 ][	 ]*\([^	 (][^	 (]*([^)]*)\)[	 ]*\(.*\)/-D\1=\2/g
-t quote
-s/^[	 ]*#[	 ]*define[	 ][	 ]*\([^	 ][^	 ]*\)[	 ]*\(.*\)/-D\1=\2/g
-t quote
-b any
-:quote
-s/[	 `~#$^&*(){}\\|;'\''"<>?]/\\&/g
-s/\[/\\&/g
-s/\]/\\&/g
-s/\$/$$/g
-H
-:any
-${
-	g
-	s/^\n//
-	s/\n/ /g
-	p
-}
-'
-DEFS=`sed -n "$ac_script" confdefs.h`
+DEFS=-DHAVE_CONFIG_H
 
-
 ac_libobjs=
 ac_ltlibobjs=
 for ac_i in : $LIBOBJS; do test "x$ac_i" = x: && continue
@@ -11390,11 +11357,15 @@ case $ac_config_files in *"
 "*) set x $ac_config_files; shift; ac_config_files=$*;;
 esac
 
+case $ac_config_headers in *"
+"*) set x $ac_config_headers; shift; ac_config_headers=$*;;
+esac
 
 
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 # Files that config.status was made for.
 config_files="$ac_config_files"
+config_headers="$ac_config_headers"
 config_commands="$ac_config_commands"
 
 _ACEOF
@@ -11415,10 +11386,15 @@ Usage: $0 [OPTION]... [TAG]...
       --recheck    update $as_me by reconfiguring in the same conditions
       --file=FILE[:TEMPLATE]
                    instantiate the configuration file FILE
+      --header=FILE[:TEMPLATE]
+                   instantiate the configuration header FILE
 
 Configuration files:
 $config_files
 
+Configuration headers:
+$config_headers
+
 Configuration commands:
 $config_commands
 
@@ -11476,7 +11452,18 @@ do
     esac
     as_fn_append CONFIG_FILES " '$ac_optarg'"
     ac_need_defaults=false;;
-  --he | --h |  --help | --hel | -h )
+  --header | --heade | --head | --hea )
+    $ac_shift
+    case $ac_optarg in
+    *\'*) ac_optarg=`$as_echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    as_fn_append CONFIG_HEADERS " '$ac_optarg'"
+    ac_need_defaults=false;;
+  --he | --h)
+    # Conflict between --help and --header
+    as_fn_error "ambiguous option: \`$1'
+Try \`$0 --help' for more information.";;
+  --help | --hel | -h )
     $as_echo "$ac_cs_usage"; exit ;;
   -q | -quiet | --quiet | --quie | --qui | --qu | --q \
   | -silent | --silent | --silen | --sile | --sil | --si | --s)
@@ -11800,6 +11787,7 @@ do
     "depfiles") CONFIG_COMMANDS="$CONFIG_COMMANDS depfiles" ;;
     "libtool") CONFIG_COMMANDS="$CONFIG_COMMANDS libtool" ;;
     "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
+    "config.h") CONFIG_HEADERS="$CONFIG_HEADERS config.h" ;;
 
   *) as_fn_error "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
   esac
@@ -11812,6 +11800,7 @@ done
 # bizarre bug on SunOS 4.1.3.
 if $ac_need_defaults; then
   test "${CONFIG_FILES+set}" = set || CONFIG_FILES=$config_files
+  test "${CONFIG_HEADERS+set}" = set || CONFIG_HEADERS=$config_headers
   test "${CONFIG_COMMANDS+set}" = set || CONFIG_COMMANDS=$config_commands
 fi
 
@@ -11990,8 +11979,116 @@ fi
 cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 fi # test -n "$CONFIG_FILES"
 
+# Set up the scripts for CONFIG_HEADERS section.
+# No need to generate them if there are no CONFIG_HEADERS.
+# This happens for instance with `./config.status Makefile'.
+if test -n "$CONFIG_HEADERS"; then
+cat >"$tmp/defines.awk" <<\_ACAWK ||
+BEGIN {
+_ACEOF
 
-eval set X "  :F $CONFIG_FILES      :C $CONFIG_COMMANDS"
+# Transform confdefs.h into an awk script `defines.awk', embedded as
+# here-document in config.status, that substitutes the proper values into
+# config.h.in to produce config.h.
+
+# Create a delimiter string that does not exist in confdefs.h, to ease
+# handling of long lines.
+ac_delim='%!_!# '
+for ac_last_try in false false :; do
+  ac_t=`sed -n "/$ac_delim/p" confdefs.h`
+  if test -z "$ac_t"; then
+    break
+  elif $ac_last_try; then
+    as_fn_error "could not make $CONFIG_HEADERS" "$LINENO" 5
+  else
+    ac_delim="$ac_delim!$ac_delim _$ac_delim!! "
+  fi
+done
+
+# For the awk script, D is an array of macro values keyed by name,
+# likewise P contains macro parameters if any.  Preserve backslash
+# newline sequences.
+
+ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
+sed -n '
+s/.\{148\}/&'"$ac_delim"'/g
+t rset
+:rset
+s/^[	 ]*#[	 ]*define[	 ][	 ]*/ /
+t def
+d
+:def
+s/\\$//
+t bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3"/p
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2"/p
+d
+:bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3\\\\\\n"\\/p
+t cont
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2\\\\\\n"\\/p
+t cont
+d
+:cont
+n
+s/.\{148\}/&'"$ac_delim"'/g
+t clear
+:clear
+s/\\$//
+t bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/"/p
+d
+:bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/\\\\\\n"\\/p
+b cont
+' <confdefs.h | sed '
+s/'"$ac_delim"'/"\\\
+"/g' >>$CONFIG_STATUS || ac_write_fail=1
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+  for (key in D) D_is_set[key] = 1
+  FS = ""
+}
+/^[\t ]*#[\t ]*(define|undef)[\t ]+$ac_word_re([\t (]|\$)/ {
+  line = \$ 0
+  split(line, arg, " ")
+  if (arg[1] == "#") {
+    defundef = arg[2]
+    mac1 = arg[3]
+  } else {
+    defundef = substr(arg[1], 2)
+    mac1 = arg[2]
+  }
+  split(mac1, mac2, "(") #)
+  macro = mac2[1]
+  prefix = substr(line, 1, index(line, defundef) - 1)
+  if (D_is_set[macro]) {
+    # Preserve the white space surrounding the "#".
+    print prefix "define", macro P[macro] D[macro]
+    next
+  } else {
+    # Replace #undef with comments.  This is necessary, for example,
+    # in the case of _POSIX_SOURCE, which is predefined and required
+    # on some systems where configure will not decide to define it.
+    if (defundef == "undef") {
+      print "/*", prefix defundef, macro, "*/"
+      next
+    }
+  }
+}
+{ print }
+_ACAWK
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+  as_fn_error "could not setup config headers machinery" "$LINENO" 5
+fi # test -n "$CONFIG_HEADERS"
+
+
+eval set X "  :F $CONFIG_FILES  :H $CONFIG_HEADERS    :C $CONFIG_COMMANDS"
 shift
 for ac_tag
 do
@@ -12209,8 +12306,65 @@ which seems to be undefined.  Please make sure it
   esac \
   || as_fn_error "could not create $ac_file" "$LINENO" 5
  ;;
+  :H)
+  #
+  # CONFIG_HEADER
+  #
+  if test x"$ac_file" != x-; then
+    {
+      $as_echo "/* $configure_input  */" \
+      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs"
+    } >"$tmp/config.h" \
+      || as_fn_error "could not create $ac_file" "$LINENO" 5
+    if diff "$ac_file" "$tmp/config.h" >/dev/null 2>&1; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
+$as_echo "$as_me: $ac_file is unchanged" >&6;}
+    else
+      rm -f "$ac_file"
+      mv "$tmp/config.h" "$ac_file" \
+	|| as_fn_error "could not create $ac_file" "$LINENO" 5
+    fi
+  else
+    $as_echo "/* $configure_input  */" \
+      && eval '$AWK -f "$tmp/defines.awk"' "$ac_file_inputs" \
+      || as_fn_error "could not create -" "$LINENO" 5
+  fi
+# Compute "$ac_file"'s index in $config_headers.
+_am_arg="$ac_file"
+_am_stamp_count=1
+for _am_header in $config_headers :; do
+  case $_am_header in
+    $_am_arg | $_am_arg:* )
+      break ;;
+    * )
+      _am_stamp_count=`expr $_am_stamp_count + 1` ;;
+  esac
+done
+echo "timestamp for $_am_arg" >`$as_dirname -- "$_am_arg" ||
+$as_expr X"$_am_arg" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$_am_arg" : 'X\(//\)[^/]' \| \
+	 X"$_am_arg" : 'X\(//\)$' \| \
+	 X"$_am_arg" : 'X\(/\)' \| . 2>/dev/null ||
+$as_echo X"$_am_arg" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`/stamp-h$_am_stamp_count
+ ;;
 
-
   :C)  { $as_echo "$as_me:${as_lineno-$LINENO}: executing $ac_file commands" >&5
 $as_echo "$as_me: executing $ac_file commands" >&6;}
  ;;
Index: lto-plugin/Makefile.in
===================================================================
--- lto-plugin/Makefile.in	(revision 166214)
+++ lto-plugin/Makefile.in	(working copy)
@@ -36,10 +36,11 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
+target_triplet = @target@
 subdir = .
 DIST_COMMON = ChangeLog $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(top_srcdir)/configure $(am__configure_deps) \
-	$(srcdir)/../mkinstalldirs
+	$(srcdir)/config.h.in $(srcdir)/../mkinstalldirs
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/depstand.m4 \
@@ -53,6 +54,7 @@ am__configure_deps = $(am__aclocal_m4_deps) $(CONF
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \
  configure.lineno config.status.lineno
 mkinstalldirs = $(SHELL) $(top_srcdir)/../mkinstalldirs
+CONFIG_HEADER = config.h
 CONFIG_CLEAN_FILES =
 CONFIG_CLEAN_VPATH_FILES =
 am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
@@ -78,11 +80,9 @@ am__base_list = \
   sed '$$!N;$$!N;$$!N;$$!N;s/\n/ /g'
 am__installdirs = "$(DESTDIR)$(libexecsubdir)"
 LTLIBRARIES = $(libexecsub_LTLIBRARIES)
-am__DEPENDENCIES_1 =
-liblto_plugin_la_DEPENDENCIES = $(am__DEPENDENCIES_1) $(if $(wildcard \
+liblto_plugin_la_DEPENDENCIES = $(if $(wildcard \
 	../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
-am_liblto_plugin_la_OBJECTS = lto-plugin.lo \
-	lto-plugin-$(LTO_FORMAT).lo
+am_liblto_plugin_la_OBJECTS = lto-plugin.lo
 liblto_plugin_la_OBJECTS = $(am_liblto_plugin_la_OBJECTS)
 liblto_plugin_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -133,19 +133,12 @@ INSTALL_SCRIPT = @INSTALL_SCRIPT@
 INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
 LD = @LD@
 LDFLAGS = @LDFLAGS@
-LIBELFINC = @LIBELFINC@
-
-# How to find libelf
-LIBELFLIBS = @LIBELFLIBS@
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LIBTOOL = @LIBTOOL@
 LIPO = @LIPO@
 LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
-
-# Which object format to parse.
-LTO_FORMAT = @LTO_FORMAT@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
@@ -219,9 +212,13 @@ sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
 sysconfdir = @sysconfdir@
+target = @target@
 target_alias = @target_alias@
+target_cpu = @target_cpu@
 target_noncanonical := @target_noncanonical@
+target_os = @target_os@
 target_subdir = @target_subdir@
+target_vendor = @target_vendor@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
@@ -229,17 +226,18 @@ ACLOCAL_AMFLAGS = -I .. -I ../config
 AUTOMAKE_OPTIONS = no-dependencies
 gcc_version := $(shell cat $(top_srcdir)/../gcc/BASE-VER)
 libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
-AM_CPPFLAGS = -I$(top_srcdir)/../include $(LIBELFINC)
+AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = -Wall -Werror
 libexecsub_LTLIBRARIES = liblto_plugin.la
-liblto_plugin_la_SOURCES = lto-plugin.c lto-plugin-$(LTO_FORMAT).c
-liblto_plugin_la_LIBADD = $(LIBELFLIBS) \
+liblto_plugin_la_SOURCES = lto-plugin.c
+liblto_plugin_la_LIBADD = \
 	$(if $(wildcard ../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
 
 liblto_plugin_la_LDFLAGS = -no-undefined -bindir $(libexecsubdir) \
 	$(if $(wildcard ../libiberty/pic/libiberty.a),,-Wc,../libiberty/libiberty.a)
 
-all: all-am
+all: config.h
+	$(MAKE) $(AM_MAKEFLAGS) all-am
 
 .SUFFIXES:
 .SUFFIXES: .c .lo .o .obj
@@ -277,6 +275,23 @@ $(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(
 $(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
 	$(am__cd) $(srcdir) && $(ACLOCAL) $(ACLOCAL_AMFLAGS)
 $(am__aclocal_m4_deps):
+
+config.h: stamp-h1
+	@if test ! -f $@; then \
+	  rm -f stamp-h1; \
+	  $(MAKE) $(AM_MAKEFLAGS) stamp-h1; \
+	else :; fi
+
+stamp-h1: $(srcdir)/config.h.in $(top_builddir)/config.status
+	@rm -f stamp-h1
+	cd $(top_builddir) && $(SHELL) ./config.status config.h
+$(srcdir)/config.h.in: @MAINTAINER_MODE_TRUE@ $(am__configure_deps) 
+	($(am__cd) $(top_srcdir) && $(AUTOHEADER))
+	rm -f stamp-h1
+	touch $@
+
+distclean-hdr:
+	-rm -f config.h stamp-h1
 install-libexecsubLTLIBRARIES: $(libexecsub_LTLIBRARIES)
 	@$(NORMAL_INSTALL)
 	test -z "$(libexecsubdir)" || $(MKDIR_P) "$(DESTDIR)$(libexecsubdir)"
@@ -345,11 +360,11 @@ ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
 	mkid -fID $$unique
 tags: TAGS
 
-TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
+TAGS:  $(HEADERS) $(SOURCES) config.h.in $(TAGS_DEPENDENCIES) \
 		$(TAGS_FILES) $(LISP)
 	set x; \
 	here=`pwd`; \
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
+	list='$(SOURCES) $(HEADERS) config.h.in $(LISP) $(TAGS_FILES)'; \
 	unique=`for i in $$list; do \
 	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
 	  done | \
@@ -367,9 +382,9 @@ tags: TAGS
 	  fi; \
 	fi
 ctags: CTAGS
-CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
+CTAGS:  $(HEADERS) $(SOURCES) config.h.in $(TAGS_DEPENDENCIES) \
 		$(TAGS_FILES) $(LISP)
-	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
+	list='$(SOURCES) $(HEADERS) config.h.in $(LISP) $(TAGS_FILES)'; \
 	unique=`for i in $$list; do \
 	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
 	  done | \
@@ -388,7 +403,7 @@ distclean-tags:
 	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
 check-am: all-am
 check: check-am
-all-am: Makefile $(LTLIBRARIES)
+all-am: Makefile $(LTLIBRARIES) config.h
 installdirs:
 	for dir in "$(DESTDIR)$(libexecsubdir)"; do \
 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
@@ -427,7 +442,7 @@ distclean: distclean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
-	distclean-libtool distclean-tags
+	distclean-hdr distclean-libtool distclean-tags
 
 dvi: dvi-am
 
@@ -490,11 +505,11 @@ ps-am:
 
 uninstall-am: uninstall-libexecsubLTLIBRARIES
 
-.MAKE: install-am install-strip
+.MAKE: all install-am install-strip
 
 .PHONY: CTAGS GTAGS all all-am am--refresh check check-am clean \
 	clean-generic clean-libexecsubLTLIBRARIES clean-libtool ctags \
-	distclean distclean-compile distclean-generic \
+	distclean distclean-compile distclean-generic distclean-hdr \
 	distclean-libtool distclean-tags dvi dvi-am html html-am info \
 	info-am install install-am install-data install-data-am \
 	install-dvi install-dvi-am install-exec install-exec-am \
Index: lto-plugin/configure.ac
===================================================================
--- lto-plugin/configure.ac	(revision 166214)
+++ lto-plugin/configure.ac	(working copy)
@@ -6,18 +6,21 @@ AM_INIT_AUTOMAKE([foreign no-dist])
 AM_MAINTAINER_MODE
 AC_PROG_CC
 AC_SYS_LARGEFILE
-AC_ARG_VAR(LIBELFLIBS,[How to link libelf])
-AC_ARG_VAR(LIBELFINC,[How to find libelf include files])
 AM_PROG_LIBTOOL
 AC_SUBST(target_noncanonical)
-. ${srcdir}/../gcc/config.gcc
-case ${lto_binary_reader} in
-  *coff*) LTO_FORMAT=coff ;;
-  *elf*)  LTO_FORMAT=elf ;;
-  *) AC_MSG_ERROR([LTO plugin is not supported on this target.]) ;;
+# Trying to get this information from gcc's config is tricky.
+case $target in
+  x86_64*-mingw*)
+    AC_DEFINE([SYM_STYLE], [ss_none], [Default symbol style])
+    ;;
+  *-cygwin* | i?86*-mingw* )
+    AC_DEFINE([SYM_STYLE], [ss_win32], [Default symbol style])
+    ;;
+  *)
+    AC_DEFINE([SYM_STYLE], [ss_none], [Default symbol style])
+    ;;
 esac
-
-AC_SUBST(LTO_FORMAT)
 AC_TYPE_UINT64_T
 AC_CONFIG_FILES(Makefile)
+AC_CONFIG_HEADERS(config.h)
 AC_OUTPUT
Index: lto-plugin/lto-plugin-coff.c
===================================================================
--- lto-plugin/lto-plugin-coff.c	(revision 166214)
+++ lto-plugin/lto-plugin-coff.c	(working copy)
@@ -1,38 +0,0 @@
-/* LTO plugin for gold.
-   Copyright (C) 2010 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
-the Free Software Foundation; either version 3, 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; see the file COPYING3.  If not see
-<http://www.gnu.org/licenses/>.  */
-
-/* Common definitions that the object format dependent code needs.  */
-#include "lto-plugin.h"
-
-/* Callback used by gold to check if the plugin will claim FILE. Writes
-   the result in CLAIMED. */
-
-enum ld_plugin_status
-claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
-{
-  /* To be implemented; for now, simply do nothing.  */
-  return LDPS_OK;
-}
-
-/* Method called first thing at onload time to perform sanity checks.  */
-
-enum ld_plugin_status
-onload_format_checks (struct ld_plugin_tv *tv)
-{
-  return LDPS_OK;
-}
-
Index: lto-plugin/Makefile.am
===================================================================
--- lto-plugin/Makefile.am	(revision 166214)
+++ lto-plugin/Makefile.am	(working copy)
@@ -7,20 +7,13 @@ gcc_version := $(shell cat $(top_srcdir)/../gcc/BA
 target_noncanonical := @target_noncanonical@
 libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
 
-# How to find libelf
-LIBELFLIBS = @LIBELFLIBS@
-LIBELFINC = @LIBELFINC@
-
-# Which object format to parse.
-LTO_FORMAT = @LTO_FORMAT@
-
-AM_CPPFLAGS = -I$(top_srcdir)/../include $(LIBELFINC)
+AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
 AM_CFLAGS = -Wall -Werror
 
 libexecsub_LTLIBRARIES = liblto_plugin.la
 
-liblto_plugin_la_SOURCES = lto-plugin.c lto-plugin-$(LTO_FORMAT).c
-liblto_plugin_la_LIBADD = $(LIBELFLIBS) \
+liblto_plugin_la_SOURCES = lto-plugin.c
+liblto_plugin_la_LIBADD = \
 	$(if $(wildcard ../libiberty/pic/libiberty.a),../libiberty/pic/libiberty.a,)
 liblto_plugin_la_LDFLAGS = -no-undefined -bindir $(libexecsubdir) \
 	$(if $(wildcard ../libiberty/pic/libiberty.a),,-Wc,../libiberty/libiberty.a)
Index: lto-plugin/lto-plugin.c
===================================================================
--- lto-plugin/lto-plugin.c	(revision 166214)
+++ lto-plugin/lto-plugin.c	(working copy)
@@ -32,6 +32,9 @@ along with this program; see the file COPYING3.  I
    -nop: Instead of running lto-wrapper, pass the original to the plugin. This
    only works if the input files are hybrid.  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
@@ -46,10 +49,73 @@ along with this program; see the file COPYING3.  I
 #include <libiberty.h>
 #include <hashtab.h>
 #include "../gcc/lto/common.h"
+#include "simple-object.h"
+#include "plugin-api.h"
 
-/* Common definitions for/from the object format dependent code.  */
-#include "lto-plugin.h"
+/* Handle opening elf files on hosts, such as Windows, that may use
+   text file handling that will break binary access.  */
+#ifndef O_BINARY
+# define O_BINARY 0
+#endif
 
+/* Segment name for LTO sections.  This is only used for Mach-O.
+   FIXME: This needs to be kept in sync with darwin.c.  */
+
+#define LTO_SEGMENT_NAME "__GNU_LTO"
+
+/* LTO magic section name.  */
+
+#define LTO_SECTION_PREFIX	".gnu.lto_.symtab"
+#define LTO_SECTION_PREFIX_LEN	(sizeof (LTO_SECTION_PREFIX) - 1)
+
+/* The part of the symbol table the plugin has to keep track of. Note that we
+   must keep SYMS until all_symbols_read is called to give the linker time to
+   copy the symbol information. */
+
+struct sym_aux
+{
+  uint32_t slot;
+  unsigned id;
+  unsigned next_conflict;
+};
+
+struct plugin_symtab
+{
+  int nsyms;
+  struct sym_aux *aux;
+  struct ld_plugin_symbol *syms;
+  unsigned id;
+};
+
+/* Encapsulates object file data during symbol scan.  */
+struct plugin_objfile
+{
+  int found;
+  simple_object_read *objfile;
+  struct plugin_symtab *out;
+  const struct ld_plugin_input_file *file;
+};
+
+/* All that we have to remember about a file. */
+
+struct plugin_file_info
+{
+  char *name;
+  void *handle;
+  struct plugin_symtab symtab;
+  struct plugin_symtab conflicts;
+};
+
+/* Until ASM_OUTPUT_LABELREF can be hookized and decoupled from
+   stdio file streams, we do simple label translation here.  */
+
+enum symbol_style
+{
+  ss_none,	/* No underscore prefix. */
+  ss_win32,	/* Underscore prefix any symbol not beginning with '@'.  */
+  ss_uscore,	/* Underscore prefix all symbols.  */
+};
+
 static char *arguments_file_name;
 static ld_plugin_register_claim_file register_claim_file;
 static ld_plugin_register_all_symbols_read register_all_symbols_read;
@@ -58,14 +124,11 @@ static ld_plugin_register_cleanup register_cleanup
 static ld_plugin_add_input_file add_input_file;
 static ld_plugin_add_input_library add_input_library;
 static ld_plugin_message message;
+static ld_plugin_add_symbols add_symbols;
 
-/* These are not static because the object format dependent
-   claim_file hooks in lto-plugin-{coff,elf}.c need them.  */
-ld_plugin_add_symbols add_symbols;
+static struct plugin_file_info *claimed_files = NULL;
+static unsigned int num_claimed_files = 0;
 
-struct plugin_file_info *claimed_files = NULL;
-unsigned int num_claimed_files = 0;
-
 static char **output_files = NULL;
 static unsigned int num_output_files = 0;
 
@@ -79,7 +142,12 @@ static bool debug;
 static bool nop;
 static char *resolution_file = NULL;
 
-void
+/* Set by default from configure.ac, but can be overridden at runtime
+   by using -plugin-opt=-sym-style={none,win32,underscore|uscore}
+   (in fact, only first letter of style arg is checked.)  */
+static enum symbol_style sym_style = SYM_STYLE;
+
+static void
 check (bool gate, enum ld_plugin_level level, const char *text)
 {
   if (gate)
@@ -100,7 +168,7 @@ check (bool gate, enum ld_plugin_level level, cons
    by P and the result is written in ENTRY. The slot number is stored in SLOT.
    Returns the address of the next entry. */
 
-char *
+static char *
 parse_table_entry (char *p, struct ld_plugin_symbol *entry, 
 		   struct sym_aux *aux)
 {
@@ -122,7 +190,24 @@ parse_table_entry (char *p, struct ld_plugin_symbo
       LDPV_HIDDEN
     };
 
-  entry->name = xstrdup (p);
+  switch (sym_style)
+    {
+    case ss_win32:
+      if (p[0] == '@')
+	{
+    /* cf. Duff's device.  */
+    case ss_none:
+	  entry->name = xstrdup (p);
+	  break;
+	}
+    /* FALL-THROUGH.  */
+    case ss_uscore:
+      entry->name = concat ("_", p, NULL);
+      break;
+    default:
+      check (false, LDPL_FATAL, "invalid symbol style requested");
+      break;
+    }
   while (*p)
     p++;
   p++;
@@ -165,7 +250,7 @@ parse_table_entry (char *p, struct ld_plugin_symbo
 /* Translate the IL symbol table located between DATA and END. Append the
    slots and symbols to OUT. */
 
-void
+static void
 translate (char *data, char *end, struct plugin_symtab *out)
 {
   struct sym_aux *aux;
@@ -621,7 +706,7 @@ static int symbol_strength (struct ld_plugin_symbo
    
    XXX how to handle common? */
 
-void
+static void
 resolve_conflicts (struct plugin_symtab *t, struct plugin_symtab *conflicts)
 {
   htab_t symtab = htab_create (t->nsyms, hash_sym, eq_sym, NULL);
@@ -689,6 +774,124 @@ resolve_conflicts (struct plugin_symtab *t, struct
   htab_delete (symtab);
 }
 
+/* Process one section of an object file.  */
+
+static int 
+process_symtab (void *data, const char *name, off_t offset, off_t length)
+{
+  struct plugin_objfile *obj = (struct plugin_objfile *)data;
+  char *s;
+  char *secdata;
+
+  if (strncmp (name, LTO_SECTION_PREFIX, LTO_SECTION_PREFIX_LEN) != 0)
+    return 1;
+
+  s = strrchr (name, '.');
+  if (s)
+    sscanf (s, ".%x", &obj->out->id);
+  secdata = xmalloc (length);
+  offset += obj->file->offset;
+  if (offset != lseek (obj->file->fd, offset, SEEK_SET)
+	|| length != read (obj->file->fd, secdata, length))
+    {
+      if (message)
+	message (LDPL_FATAL, "%s: corrupt object file", obj->file->name);
+      /* Force claim_file_handler to abandon this file.  */
+      obj->found = 0;
+      free (secdata);
+      return 0;
+    }
+
+  translate (secdata, secdata + length, obj->out);
+  obj->found++;
+  free (secdata);
+  return 1;
+}
+
+/* Callback used by gold to check if the plugin will claim FILE. Writes
+   the result in CLAIMED. */
+
+static enum ld_plugin_status
+claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
+{
+  enum ld_plugin_status status;
+  struct plugin_objfile obj;
+  struct plugin_file_info lto_file;
+  int err;
+  const char *errmsg;
+
+  memset (&lto_file, 0, sizeof (struct plugin_file_info));
+
+  if (file->offset != 0)
+    {
+      char *objname;
+      /* We pass the offset of the actual file, not the archive header. */
+      int t = asprintf (&objname, "%s@0x%" PRIx64, file->name,
+                        (int64_t) file->offset);
+      check (t >= 0, LDPL_FATAL, "asprintf failed");
+      lto_file.name = objname;
+    }
+  else
+    {
+      lto_file.name = xstrdup (file->name);
+    }
+  lto_file.handle = file->handle;
+
+  *claimed = 0;
+  obj.file = file;
+  obj.found = 0;
+  obj.out = &lto_file.symtab;
+  errmsg = NULL;
+  obj.objfile = simple_object_start_read (file->fd, file->offset, LTO_SEGMENT_NAME,
+			&errmsg, &err);
+  /* No file, but also no error code means unrecognized format; just skip it.  */
+  if (!obj.objfile && !err)
+    goto err;
+
+  if (obj.objfile)
+    errmsg = simple_object_find_sections (obj.objfile, process_symtab, &obj, &err);
+
+  if (!obj.objfile || errmsg)
+    {
+      if (err && message)
+	message (LDPL_FATAL, "%s: %s: %s", file->name, errmsg,
+		xstrerror (err));
+      else if (message)
+	message (LDPL_FATAL, "%s: %s", file->name, errmsg);
+      goto err;
+    }
+
+  if (obj.found == 0)
+    goto err;
+
+  if (obj.found > 1)
+    resolve_conflicts (&lto_file.symtab, &lto_file.conflicts);
+
+  status = add_symbols (file->handle, lto_file.symtab.nsyms,
+			lto_file.symtab.syms);
+  check (status == LDPS_OK, LDPL_FATAL, "could not add symbols");
+
+  *claimed = 1;
+  num_claimed_files++;
+  claimed_files =
+    xrealloc (claimed_files,
+	      num_claimed_files * sizeof (struct plugin_file_info));
+  claimed_files[num_claimed_files - 1] = lto_file;
+
+  goto cleanup;
+
+ err:
+  free (lto_file.name);
+
+ cleanup:
+  if (obj.objfile)
+    simple_object_release_read (obj.objfile);
+  if (file->fd >= 0)
+    close (file->fd);
+
+  return LDPS_OK;
+}
+
 /* Parse the plugin options. */
 
 static void
@@ -706,6 +909,21 @@ process_option (const char *option)
       pass_through_items[num_pass_through_items - 1] =
           xstrdup (option + strlen ("-pass-through="));
     }
+  else if (!strncmp (option, "-sym-style=", sizeof ("-sym-style=") - 1))
+    {
+      switch (option[sizeof ("-sym-style=") - 1])
+	{
+	case 'w':
+	  sym_style = ss_win32;
+	  break;
+	case 'u':
+	  sym_style = ss_uscore;
+	  break;
+	default:
+	  sym_style = ss_none;
+	  break;
+	}
+    }
   else
     {
       int size;
@@ -727,10 +945,6 @@ onload (struct ld_plugin_tv *tv)
   struct ld_plugin_tv *p;
   enum ld_plugin_status status;
 
-  status = onload_format_checks (tv);
-  if (status != LDPS_OK)
-    return status;
-
   p = tv;
   while (p->tv_tag)
     {
Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(revision 166214)
+++ gcc/config.gcc	(working copy)
@@ -219,8 +219,6 @@ default_gnu_indirect_function=no
 target_gtfiles=
 need_64bit_hwint=
 need_64bit_isa=
-# Selects the object file format reader/writer used by LTO.
-lto_binary_reader=lto-elf
 
 # Don't carry these over build->host->target.  Please.
 xm_file=
@@ -1160,13 +1158,11 @@ i[34567]86-*-darwin*)
 	# support.
 	with_cpu=${with_cpu:-generic}
 	tmake_file="${tmake_file} t-slibgcc-darwin i386/t-crtpc i386/t-crtfm"
-	lto_binary_reader=lto-macho
 	;;
 x86_64-*-darwin*)
 	with_cpu=${with_cpu:-generic}
 	tmake_file="${tmake_file} ${cpu_type}/t-darwin64 t-slibgcc-darwin i386/t-crtpc i386/t-crtfm"
 	tm_file="${tm_file} ${cpu_type}/darwin64.h"
-	lto_binary_reader=lto-macho
 	;;
 i[34567]86-*-elf*)
 	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h"
@@ -1421,7 +1417,6 @@ i[34567]86-*-pe | i[34567]86-*-cygwin*)
 		thread_file='posix'
 	fi
 	use_gcc_stdint=wrap
-	lto_binary_reader=lto-coff
 	;;
 i[34567]86-*-mingw* | x86_64-*-mingw*)
 	tm_file="${tm_file} i386/unix.h i386/bsd.h i386/gas.h dbxcoff.h i386/cygming.h i386/mingw32.h"
@@ -1494,7 +1489,6 @@ i[34567]86-*-mingw* | x86_64-*-mingw*)
 	cxx_target_objs="${cxx_target_objs} winnt-cxx.o msformat-c.o"
 	default_use_cxa_atexit=yes
 	use_gcc_stdint=wrap
-	lto_binary_reader=lto-coff
 	case ${enable_threads} in
 	  "" | yes | win32)	  thread_file='win32'
 	  tmake_file="${tmake_file} i386/t-gthr-win32"
@@ -2006,7 +2000,6 @@ powerpc-*-darwin*)
 	    ;;
 	esac
 	tmake_file="${tmake_file} t-slibgcc-darwin"
-	lto_binary_reader=lto-macho
 	extra_headers=altivec.h
 	;;
 powerpc64-*-darwin*)
@@ -2014,7 +2007,6 @@ powerpc64-*-darwin*)
 	extra_parts="crt2.o"
 	tmake_file="${tmake_file} ${cpu_type}/t-darwin64 t-slibgcc-darwin"
 	tm_file="${tm_file} ${cpu_type}/darwin8.h ${cpu_type}/darwin64.h"
-	lto_binary_reader=lto-macho
 	extra_headers=altivec.h
 	;;
 powerpc*-*-freebsd*)
Index: gcc/doc/install.texi
===================================================================
--- gcc/doc/install.texi	(revision 166214)
+++ gcc/doc/install.texi	(working copy)
@@ -355,17 +355,6 @@ not installed in your default library search path.
 
 Necessary to build libgcj, the GCJ runtime.
 
-@item libelf version 0.8.12 (or later)
-
-Necessary to build link-time optimization (LTO) support.  It can be
-downloaded from @uref{http://www.mr511.de/software/libelf-0.8.12.tar.gz},
-though it is commonly available in several systems.  The version in
-IRIX 6.5 doesn't work since it lacks @file{gelf.h}.  The version in
-Solaris 2 does work.
-
-The @option{--with-libelf} configure option should be used if libelf is
-not installed in your default library search patch.
-
 @end table
 
 @heading Tools/packages necessary for modifying GCC
@@ -1650,21 +1639,10 @@ default for a native toolchain with an assembler t
 GLIBC 2.11 or above, otherwise disabled.
 
 @item --enable-lto
+@itemx --disable-lto
 Enable support for link-time optimization (LTO).  This is enabled by
-default if a working libelf implementation is found (see
-@option{--with-libelf}).
+default, and may be disabled using @option{--disable-lto}.
 
-@item --with-libelf=@var{pathname}
-@itemx --with-libelf-include=@var{pathname}
-@itemx --with-libelf-lib=@var{pathname}
-If you do not have libelf installed in a standard location and you
-want to enable support for link-time optimization (LTO), you can
-explicitly specify the directory where libelf is installed
-(@samp{--with-libelf=@var{libelfinstalldir}}).  The
-@option{--with-libelf=@var{libelfinstalldir}} option is shorthand for
-@option{--with-libelf-include=@var{libelfinstalldir}/include}
-@option{--with-libelf-lib=@var{libelfinstalldir}/lib}.
-
 @item --enable-gold
 Enable support for using @command{gold} as the linker.  If gold support is
 enabled together with @option{--enable-lto}, an additional directory

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