Sync with gcc repository.

2009-10-07 05:57:49 +00:00
parent 84e91636f7
commit bd45d6fa76
6 changed files with 2084 additions and 18 deletions
--- a/45
+++ b/45
@@ -1,3 +1,43 @@
+2009-10-06  Ian Lance Taylor  <iant@google.com>
+
+	* Makefile.def: check-gold depends upon all-gas.
+	* Makefile.in: Rebuild.
+
+2009-10-03  2009-02-05  Rafael Avila de Espindola  <espindola@google.com>
+
+	* Makefile.def: all-lto-plugin depends on all-libiberty.
+	set bootstrap=true for lto-plugin.
+	Add lto-plugin.
+	* Makefile.in: Regenerate.
+	* configure.ac (host_libs): Add lto-plugin.
+	* configure: Regenerate.
+
+2009-10-03  Diego Novillo  <dnovillo@google.com>
+
+	* Makefile.tpl (HOST_EXPORTS): Add LIBELFLIBS and LIBELFINC.
+	(HOST_LIBELFLIBS): Define.
+	(HOST_LIBELFINC): Define.
+	* Makefile.in: Regenerate.
+	* configure.ac: Add --enable-lto.
+	Add --with-libelf, --with-libelf-include and --with-libelf-lib.
+	If --enable-lto is used, add 'lto' to new_enable_languages.
+	If --enable-lto is used and gold is enabled, add
+	lto-plugin to configdirs.
+	* configure: Regenerate.
+
+2009-10-03  Simon Baldwin  <simonb@google.com>
+
+	* configure.ac: If --with-system-zlib, suppress local zlib and
+	pass --with-system-zlib to subdir configure scripts.
+	* configure: Regenerate.
+
+2009-10-01  Loren J. Rittle <ljrittle@acm.org>
+	    Paolo Bonzini  <bonzini@gnu.org>
+
+	* Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Use $$s rather than
+	$(srcdir).
+	* Makefile.in: Rebuilt.
+
 2009-09-29  Paolo Bonzini  <bonzini@gnu.org>

 	Sync from gcc:
@@ -16,6 +56,11 @@

 	* config.sub, config.guess: Update from upstream sources.

+2009-09-22  Loren J. Rittle <ljrittle@acm.org>
+
+	* Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Remove stray $$r/.
+	* Makefile.in: Rebuilt.
+
 2009-09-22  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>

 	PR bootstrap/32272
--- a/Makefile.def
+++ b/Makefile.def
@@ -97,7 +97,8 @@ host_modules= { module= ld; bootstrap=true; };
 host_modules= { module= libcpp; bootstrap=true; };
 host_modules= { module= libdecnumber; bootstrap=true; };
 host_modules= { module= libgui; };
-host_modules= { module= libiberty; bootstrap=true; };
+host_modules= { module= libiberty; bootstrap=true;
+	        extra_configure_flags='@extra_host_libiberty_configure_flags@';};
 // We abuse missing to avoid installing anything for libiconv.
 host_modules= { module= libiconv;
 		extra_configure_flags='--disable-shared';
@@ -141,6 +142,7 @@ host_modules= { module= libtermcap; no_check=true;
                missing=maintainer-clean; };
 host_modules= { module= utils; no_check=true; };
 host_modules= { module= gnattools; };
+host_modules= { module= lto-plugin; bootstrap=true; };

 target_modules = { module= libstdc++-v3;
 		   bootstrap=true;
@@ -346,6 +348,8 @@ dependencies = { module=all-fixincludes; on=all-libiberty; };

 dependencies = { module=all-gnattools; on=all-target-libada; };

+dependencies = { module=all-lto-plugin; on=all-libiberty; };
+
 dependencies = { module=configure-mpfr; on=all-gmp; };
 dependencies = { module=configure-mpc; on=all-mpfr; };
 dependencies = { module=configure-ppl; on=all-gmp; };
@@ -424,6 +428,7 @@ dependencies = { module=all-gold; on=all-bfd; };
 dependencies = { module=all-gold; on=all-build-bison; };
 dependencies = { module=all-gold; on=all-build-byacc; };
 dependencies = { module=check-gold; on=all-binutils; };
+dependencies = { module=check-gold; on=all-gas; };

 dependencies = { module=configure-opcodes; on=configure-intl; };
 dependencies = { module=all-opcodes; on=all-bfd; };
--- a/Makefile.in
+++ b/Makefile.in
--- a/Makefile.tpl
+++ b/Makefile.tpl
@@ -222,6 +222,8 @@ HOST_EXPORTS = \
 	PPLINC="$(HOST_PPLINC)"; export PPLINC; \
 	CLOOGLIBS="$(HOST_CLOOGLIBS)"; export CLOOGLIBS; \
 	CLOOGINC="$(HOST_CLOOGINC)"; export CLOOGINC; \
+	LIBELFLIBS="$(HOST_LIBELFLIBS)" ; export LIBELFLIBS; \
+	LIBELFINC="$(HOST_LIBELFINC)" ; export LIBELFINC; \
@if gcc-bootstrap
 	$(RPATH_ENVVAR)=`echo "$(TARGET_LIB_PATH)$$$(RPATH_ENVVAR)" | sed 's,::*,:,g;s,^:*,,;s,:*$$,,'`; export $(RPATH_ENVVAR); \
@endif gcc-bootstrap
@@ -238,7 +240,7 @@ POSTSTAGE1_HOST_EXPORTS = \
 	  -B$$r/$(HOST_SUBDIR)/prev-gcc/ -B$(build_tooldir)/bin/ -nostdinc++ \
 	  -I$$r/prev-$(TARGET_SUBDIR)/libstdc++-v3/include/$(TARGET_SUBDIR) \
 	  -I$$r/prev-$(TARGET_SUBDIR)/libstdc++-v3/include \
-	  -I$$r/$(srcdir)/libstdc++-v3/libsupc++ \
+	  -I$$s/libstdc++-v3/libsupc++ \
 	  -L$$r/prev-$(TARGET_SUBDIR)/libstdc++-v3/src/.libs"; export CXX; \
 	CXX_FOR_BUILD="$$CXX"; export CXX_FOR_BUILD; \
 	GNATBIND="$$r/$(HOST_SUBDIR)/prev-gcc/gnatbind"; export GNATBIND; \
@@ -296,6 +298,10 @@ HOST_PPLINC = @pplinc@
 HOST_CLOOGLIBS = @clooglibs@
 HOST_CLOOGINC = @clooginc@

+# Where to find libelf
+HOST_LIBELFLIBS = @libelflibs@
+HOST_LIBELFINC = @libelfinc@
+
 # ----------------------------------------------
 # Programs producing files for the BUILD machine
 # ----------------------------------------------
--- a/880
+++ b/880
@@ -553,6 +553,42 @@ PACKAGE_URL=

 ac_unique_file="move-if-change"
 enable_option_checking=no
+# Factoring default headers for most tests.
+ac_includes_default="\
+#include <stdio.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_STRING_H
+# if !defined STDC_HEADERS && defined HAVE_MEMORY_H
+#  include <memory.h>
+# endif
+# include <string.h>
+#endif
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif"
+
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
 compare_exclusions
@@ -637,6 +673,12 @@ CFLAGS_FOR_TARGET
 DEBUG_PREFIX_CFLAGS_FOR_TARGET
 SYSROOT_CFLAGS_FOR_TARGET
 stage1_languages
+extra_host_libiberty_configure_flags
+libelfinc
+libelflibs
+EGREP
+GREP
+CPP
 clooginc
 clooglibs
 pplinc
@@ -764,6 +806,10 @@ with_cloog
 with_cloog_include
 with_cloog_lib
 enable_cloog_version_check
+enable_lto
+with_libelf
+with_libelf_include
+with_libelf_lib
 enable_stage1_languages
 enable_objc_gc
 with_build_sysroot
@@ -787,6 +833,7 @@ CPPFLAGS
 CXX
 CXXFLAGS
 CCC
+CPP
 AR
 AS
 DLLTOOL
@@ -1441,6 +1488,7 @@ Optional Features:
  --enable-build-with-cxx build with C++ compiler instead of C compiler
  --disable-ppl-version-check    disable check for PPL version
  --disable-cloog-version-check  disable check for CLooG version
+  --enable-lto            enable link time optimization support
  --enable-stage1-languages[=all]   choose additional languages to build during
                          stage1.  Mostly useful for compiler development.
  --enable-objc-gc        enable use of Boehm's garbage collector with the
@@ -1495,6 +1543,11 @@ Optional Packages:
                          plus --with-cloog-lib=PATH/lib
  --with-cloog-include=PATH Specify directory for installed CLooG include files
  --with-cloog-lib=PATH   Specify the directory for the installed CLooG library
+  --with-libelf=PATH       Specify prefix directory for the installed libelf package
+                          Equivalent to --with-libelf-include=PATH/include
+                          plus --with-libelf-lib=PATH/lib
+  --with-libelf-include=PATH Specify directory for installed libelf include files
+  --with-libelf-lib=PATH   Specify the directory for the installed libelf library
  --with-build-sysroot=SYSROOT
                          use sysroot as the system root during the build
  --with-debug-prefix-map='A=B C=D ...'
@@ -1514,6 +1567,7 @@ Some influential environment variables:
              you have headers in a nonstandard directory <include dir>
  CXX         C++ compiler command
  CXXFLAGS    C++ compiler flags
+  CPP         C preprocessor
  AR          AR for the host
  AS          AS for the host
  DLLTOOL     DLLTOOL for the host
@@ -1760,6 +1814,203 @@ fi
  return $ac_retval

 } # ac_fn_c_try_link
+
+# ac_fn_c_try_cpp LINENO
+# ----------------------
+# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_cpp ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } >/dev/null && {
+	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+    ac_retval=1
+fi
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  return $ac_retval
+
+} # ac_fn_c_try_cpp
+
+# ac_fn_c_check_header_mongrel LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists, giving a warning if it cannot be compiled using
+# the include files in INCLUDES and setting the cache variable VAR
+# accordingly.
+ac_fn_c_check_header_mongrel ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+else
+  # Is the header compilable?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 usability" >&5
+$as_echo_n "checking $2 usability... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_header_compiler=yes
+else
+  ac_header_compiler=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_compiler" >&5
+$as_echo "$ac_header_compiler" >&6; }
+
+# Is the header present?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 presence" >&5
+$as_echo_n "checking $2 presence... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <$2>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  ac_header_preproc=yes
+else
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_preproc" >&5
+$as_echo "$ac_header_preproc" >&6; }
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in #((
+  yes:no: )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&5
+$as_echo "$as_me: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+    ;;
+  no:yes:* )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: present but cannot be compiled" >&5
+$as_echo "$as_me: WARNING: $2: present but cannot be compiled" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     check for missing prerequisite headers?" >&5
+$as_echo "$as_me: WARNING: $2:     check for missing prerequisite headers?" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: see the Autoconf documentation" >&5
+$as_echo "$as_me: WARNING: $2: see the Autoconf documentation" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&5
+$as_echo "$as_me: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+    ;;
+esac
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  eval "$3=\$ac_header_compiler"
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+fi
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+
+} # ac_fn_c_check_header_mongrel
+
+# ac_fn_c_try_run LINENO
+# ----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
+# that executables *can* be run.
+ac_fn_c_try_run ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && { ac_try='./conftest$ac_exeext'
+  { { case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+       $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+       ac_retval=$ac_status
+fi
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  return $ac_retval
+
+} # ac_fn_c_try_run
+
+# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_c_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+
+} # ac_fn_c_check_header_compile
 cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
@@ -2768,6 +3019,13 @@ if test x$with_gnu_as = xno ; then
  noconfigdirs="$noconfigdirs gas"
 fi

+use_included_zlib=
+# Make sure we don't let ZLIB be added if we didn't want it.
+if test x$with_system_zlib = xyes ; then
+  use_included_zlib=no
+  noconfigdirs="$noconfigdirs zlib"
+fi
+
 # some tools are so dependent upon X11 that if we're not building with X,
 # it's not even worth trying to configure, much less build, that tool.

@@ -5667,6 +5925,602 @@ fi



+# Check for LTO support.
+# Check whether --enable-lto was given.
+if test "${enable_lto+set}" = set; then :
+  enableval=$enable_lto; enable_lto=$enableval
+else
+  enable_lto=yes; default_enable_lto=yes
+fi
+
+
+if test x"$enable_lto" = x"yes" ; then
+  # Make sure that libelf.h and gelf.h are available.
+
+# Check whether --with-libelf was given.
+if test "${with_libelf+set}" = set; then :
+  withval=$with_libelf;
+fi
+
+
+
+# Check whether --with-libelf_include was given.
+if test "${with_libelf_include+set}" = set; then :
+  withval=$with_libelf_include;
+fi
+
+
+
+# Check whether --with-libelf_lib was given.
+if test "${with_libelf_lib+set}" = set; then :
+  withval=$with_libelf_lib;
+fi
+
+
+  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$$r/$(HOST_SUBDIR)/libelf/.libs -L$$r/$(HOST_SUBDIR)/libelf/_libs -lelf '
+    libelfinc='-I$$r/$(HOST_SUBDIR)/libelf/include -I$$s/libelf/include'
+    LIBS="$libelflibs $LIBS"
+  fi
+
+  saved_CFLAGS="$CFLAGS"
+  saved_CPPFLAGS="$CPPFLAGS"
+  saved_LIBS="$LIBS"
+
+  CFLAGS="$CFLAGS $libelfinc"
+  CPPFLAGS="$CPPFLAGS $libelfinc"
+  LIBS="$LIBS $libelflibs"
+
+  ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how to run the C preprocessor" >&5
+$as_echo_n "checking how to run the C preprocessor... " >&6; }
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+  CPP=
+fi
+if test -z "$CPP"; then
+  if test "${ac_cv_prog_CPP+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+      # Double quotes because CPP needs to be expanded
+    for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
+    do
+      ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+  break
+fi
+
+    done
+    ac_cv_prog_CPP=$CPP
+
+fi
+  CPP=$ac_cv_prog_CPP
+else
+  ac_cv_prog_CPP=$CPP
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $CPP" >&5
+$as_echo "$CPP" >&6; }
+ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+
+else
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error "C preprocessor \"$CPP\" fails sanity check
+See \`config.log' for more details." "$LINENO" 5; }
+fi
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
+$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
+if test "${ac_cv_path_GREP+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -z "$GREP"; then
+  ac_path_GREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in grep ggrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
+      { test -f "$ac_path_GREP" && $as_test_x "$ac_path_GREP"; } || continue
+# Check for GNU ac_path_GREP and select it if it is found.
+  # Check for GNU $ac_path_GREP
+case `"$ac_path_GREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'GREP' >> "conftest.nl"
+    "$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_GREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_GREP="$ac_path_GREP"
+      ac_path_GREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_GREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_GREP"; then
+    as_fn_error "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_GREP=$GREP
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
+$as_echo "$ac_cv_path_GREP" >&6; }
+ GREP="$ac_cv_path_GREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
+$as_echo_n "checking for egrep... " >&6; }
+if test "${ac_cv_path_EGREP+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
+   then ac_cv_path_EGREP="$GREP -E"
+   else
+     if test -z "$EGREP"; then
+  ac_path_EGREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in egrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
+      { test -f "$ac_path_EGREP" && $as_test_x "$ac_path_EGREP"; } || continue
+# Check for GNU ac_path_EGREP and select it if it is found.
+  # Check for GNU $ac_path_EGREP
+case `"$ac_path_EGREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'EGREP' >> "conftest.nl"
+    "$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_EGREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_EGREP="$ac_path_EGREP"
+      ac_path_EGREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_EGREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_EGREP"; then
+    as_fn_error "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_EGREP=$EGREP
+fi
+
+   fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
+$as_echo "$ac_cv_path_EGREP" >&6; }
+ EGREP="$ac_cv_path_EGREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
+$as_echo_n "checking for ANSI C header files... " >&6; }
+if test "${ac_cv_header_stdc+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_header_stdc=yes
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <string.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "memchr" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "free" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+  if test "$cross_compiling" = yes; then :
+  :
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ctype.h>
+#include <stdlib.h>
+#if ((' ' & 0x0FF) == 0x020)
+# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#else
+# define ISLOWER(c) \
+		   (('a' <= (c) && (c) <= 'i') \
+		     || ('j' <= (c) && (c) <= 'r') \
+		     || ('s' <= (c) && (c) <= 'z'))
+# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
+#endif
+
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    if (XOR (islower (i), ISLOWER (i))
+	|| toupper (i) != TOUPPER (i))
+      return 2;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
+$as_echo "$ac_cv_header_stdc" >&6; }
+if test $ac_cv_header_stdc = yes; then
+
+$as_echo "#define STDC_HEADERS 1" >>confdefs.h
+
+fi
+
+# On IRIX 5.3, sys/types and inttypes.h are conflicting.
+for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
+		  inttypes.h stdint.h unistd.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default
+"
+eval as_val=\$$as_ac_Header
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+for ac_header in libelf.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "libelf.h" "ac_cv_header_libelf_h" "$ac_includes_default"
+if test "x$ac_cv_header_libelf_h" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBELF_H 1
+_ACEOF
+ have_libelf_h=yes
+fi
+
+done
+
+  for ac_header in gelf.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "gelf.h" "ac_cv_header_gelf_h" "$ac_includes_default"
+if test "x$ac_cv_header_gelf_h" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_GELF_H 1
+_ACEOF
+ have_gelf_h=yes
+fi
+
+done
+
+
+  for ac_header in libelf/libelf.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "libelf/libelf.h" "ac_cv_header_libelf_libelf_h" "$ac_includes_default"
+if test "x$ac_cv_header_libelf_libelf_h" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBELF_LIBELF_H 1
+_ACEOF
+ have_libelf_libelf_h=yes
+fi
+
+done
+
+  for ac_header in libelf/gelf.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "libelf/gelf.h" "ac_cv_header_libelf_gelf_h" "$ac_includes_default"
+if test "x$ac_cv_header_libelf_gelf_h" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBELF_GELF_H 1
+_ACEOF
+ have_libelf_gelf_h=yes
+fi
+
+done
+
+
+  # If we couldn't find libelf.h and the user forced it, emit an error.
+  if test x"$have_libelf_h" != x"yes" \
+     && test x"$have_libelf_libelf_h" != x"yes" ; then
+    if test x"$default_enable_lto" != x"yes" ; then
+      as_fn_error "LTO support requires libelf.h or libelf/libelf.h." "$LINENO" 5
+    else
+      enable_lto=no
+      libelflibs=
+      libelfinc=
+    fi
+  fi
+
+  # If we couldn't find gelf.h and the user forced it, emit an error.
+  if test x"$have_gelf_h" != x"yes" \
+     && test x"$have_libelf_gelf_h" != x"yes" ; then
+    if test x"$default_enable_lto" != x"yes" ; then
+      as_fn_error "LTO support requires gelf.h or libelf/gelf.h." "$LINENO" 5
+    else
+      enable_lto=no
+      libelflibs=
+      libelfinc=
+    fi
+  fi
+
+  # Check that the detected libelf has the functions we need.  We cannot
+  # rely on just detecting the headers since they do not include
+  # versioning information.  Add functions, if needed.
+  if test x"$enable_lto" = x"yes" ; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for the correct version of libelf" >&5
+$as_echo_n "checking for the correct version of libelf... " >&6; }
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <libelf.h>
+int
+main ()
+{
+
+      elf_errmsg (0);
+      elf_getscn (0, 0);
+      elf_nextscn (0, 0);
+      elf_strptr (0, 0, 0);
+      elf_getident (0, 0);
+      elf_getshdrstrndx (0, 0);
+      elf_begin (0, 0, 0);
+      elf_ndxscn (0);
+      elf_end (0);
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; };
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }; enable_lto=no; libelflibs= ; libelfinc=
+
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+
+    # 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
+      as_fn_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." "$LINENO" 5
+    fi
+  fi
+
+  CFLAGS="$saved_CFLAGS"
+  CPPFLAGS="$saved_CPPFLAGS"
+  LIBS="$saved_LIBS"
+
+  # Flags needed for libelf.
+
+
+fi
+

 # By default, C is the only stage 1 language.
 stage1_languages=,c,
@@ -5735,6 +6589,18 @@ if test -d ${srcdir}/gcc; then
  done

  new_enable_languages=,c,
+
+  # If LTO is enabled, add the LTO front end.
+  extra_host_libiberty_configure_flags=
+  if test "$enable_lto" = "yes" ; then
+    new_enable_languages="${new_enable_languages}lto,"
+    if test "${ENABLE_GOLD}" = "yes" ; then
+      configdirs="$configdirs lto-plugin"
+      extra_host_libiberty_configure_flags=--enable-shared
+    fi
+  fi
+
+
  missing_languages=`echo ",$enable_languages," | sed -e s/,all,/,/ -e s/,c,/,/ `
  potential_languages=,c,

@@ -6197,7 +7063,7 @@ if test x"${with_libs}" != x && test x"${with_libs}" != xno ; then
  fi
 fi

-# Set with_gnu_as and with_gnu_ld as appropriate.
+# Set with_gnu_as, with_gnu_ld, and with_system_zlib as appropriate.
 #
 # This is done by determining whether or not the appropriate directory
 # is available, and by checking whether or not specific configurations
@@ -6208,7 +7074,9 @@ fi
 #
 # If the default for a toolchain is to use GNU as and ld, and you don't
 # want to do that, then you should use the --without-gnu-as and
-# --without-gnu-ld options for the configure script.
+# --without-gnu-ld options for the configure script.  Similarly, if
+# the default is to use the included zlib and you don't want to do that,
+# you should use the --with-system-zlib option for the configure script.

 if test x${use_gnu_as} = x &&
   echo " ${configdirs} " | grep " gas " > /dev/null 2>&1 ; then
@@ -6222,6 +7090,14 @@ if test x${use_gnu_ld} = x &&
  extra_host_args="$extra_host_args --with-gnu-ld"
 fi

+if test x${use_included_zlib} = x &&
+   echo " ${configdirs} " | grep " zlib " > /dev/null 2>&1 ; then
+  :
+else
+  with_system_zlib=yes
+  extra_host_args="$extra_host_args --with-system-zlib"
+fi
+
 # If using newlib, add --with-newlib to the extra_host_args so that gcc/configure
 # can detect this case.

--- a/configure.ac
+++ b/configure.ac
@@ -260,6 +260,13 @@ if test x$with_gnu_as = xno ; then
  noconfigdirs="$noconfigdirs gas"
 fi

+use_included_zlib=
+# Make sure we don't let ZLIB be added if we didn't want it.
+if test x$with_system_zlib = xyes ; then
+  use_included_zlib=no
+  noconfigdirs="$noconfigdirs zlib"
+fi
+
 # some tools are so dependent upon X11 that if we're not building with X, 
 # it's not even worth trying to configure, much less build, that tool.

@@ -1611,6 +1618,127 @@ fi
 AC_SUBST(clooglibs)
 AC_SUBST(clooginc)

+# Check for LTO support.
+AC_ARG_ENABLE(lto,
+[  --enable-lto            enable link time optimization support],
+enable_lto=$enableval,
+enable_lto=yes; default_enable_lto=yes)
+
+if test x"$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])
+
+  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$$r/$(HOST_SUBDIR)/libelf/.libs -L$$r/$(HOST_SUBDIR)/libelf/_libs -lelf '
+    libelfinc='-I$$r/$(HOST_SUBDIR)/libelf/include -I$$s/libelf/include'
+    LIBS="$libelflibs $LIBS"
+  fi
+
+  saved_CFLAGS="$CFLAGS"
+  saved_CPPFLAGS="$CPPFLAGS"
+  saved_LIBS="$LIBS"
+
+  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_getshdrstrndx (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= ]
+    )
+
+    # 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"
+
+  # Flags needed for libelf.
+  AC_SUBST(libelflibs)
+  AC_SUBST(libelfinc)
+fi
+

 # By default, C is the only stage 1 language.
 stage1_languages=,c,
@@ -1679,6 +1807,18 @@ if test -d ${srcdir}/gcc; then
  done

  new_enable_languages=,c,
+
+  # If LTO is enabled, add the LTO front end.
+  extra_host_libiberty_configure_flags=
+  if test "$enable_lto" = "yes" ; then
+    new_enable_languages="${new_enable_languages}lto,"
+    if test "${ENABLE_GOLD}" = "yes" ; then
+      configdirs="$configdirs lto-plugin"
+      extra_host_libiberty_configure_flags=--enable-shared
+    fi
+  fi
+  AC_SUBST(extra_host_libiberty_configure_flags)
+
  missing_languages=`echo ",$enable_languages," | sed -e s/,all,/,/ -e s/,c,/,/ `
  potential_languages=,c,

@@ -2088,7 +2228,7 @@ if test x"${with_libs}" != x && test x"${with_libs}" != xno ; then
  fi
 fi

-# Set with_gnu_as and with_gnu_ld as appropriate.
+# Set with_gnu_as, with_gnu_ld, and with_system_zlib as appropriate.
 #
 # This is done by determining whether or not the appropriate directory
 # is available, and by checking whether or not specific configurations
@@ -2099,7 +2239,9 @@ fi
 #
 # If the default for a toolchain is to use GNU as and ld, and you don't 
 # want to do that, then you should use the --without-gnu-as and
-# --without-gnu-ld options for the configure script.
+# --without-gnu-ld options for the configure script.  Similarly, if
+# the default is to use the included zlib and you don't want to do that,
+# you should use the --with-system-zlib option for the configure script.

 if test x${use_gnu_as} = x &&
   echo " ${configdirs} " | grep " gas " > /dev/null 2>&1 ; then
@@ -2113,6 +2255,14 @@ if test x${use_gnu_ld} = x &&
  extra_host_args="$extra_host_args --with-gnu-ld"
 fi

+if test x${use_included_zlib} = x &&
+   echo " ${configdirs} " | grep " zlib " > /dev/null 2>&1 ; then
+  :
+else
+  with_system_zlib=yes
+  extra_host_args="$extra_host_args --with-system-zlib"
+fi
+
 # If using newlib, add --with-newlib to the extra_host_args so that gcc/configure
 # can detect this case.