Merge branch 'master' into ng/master

* master:
  multilib: move to contrib
  tests: improve diagnostics when write(2) fails
  readme: how to run the testsuite with cross-compilers
  tests: no need to unset CFLAGS in tests requiring 'gcc' anymore
  test defs: allow compilers to be auto-selected on user's request
  test defs: substitute compilers and flags found at configure time
  test defs: setup `*FLAGS' variables for GNU compilers
  configure: search generic compilers for use in the tests
  tests: remove redundant 'set -e' calls
  tests: fix spurious failure due to autom4te caching
  dist tests: missing 'compress' program was causing spurious failures
  vala: fix name of temporary file used in vala rules
  vala tests: add missing 'valac' requirement, and other minor fixlets
  news: fix grammaro
  fixup: distribute 'contrib/multilib/multi.m4'
  multilib: deprecate, will be moved to contrib
  fixlet: flags for Fortran77 compiler are in FFLAGS, not F77FLAGS
  cosmetics: fix a botched comment in a maintainer check

+ Extra edits:

* contrib/multilib/multilib.am: Don't use $(AM_MAKEFLAGS) in
recursive make invocations.

6 files changed, 1081 insertions, 0 deletions

diff --git a/contrib/Makefile.am b/contrib/Makefile.am
index 970ef75ac..91c1cab2b 100644
--- a/contrib/Makefile.am
+++ b/contrib/Makefile.am
@@ -19,4 +19,9 @@
 
 EXTRA_DIST = \
   check-html.am \
+  multilib/README \
+  multilib/config-ml.in \
+  multilib/symlink-tree \
+  multilib/multilib.am \
+  multilib/multi.m4 \
   README
diff --git a/contrib/multilib/README b/contrib/multilib/README
new file mode 100644
index 000000000..35c726f84
--- /dev/null
+++ b/contrib/multilib/README
@@ -0,0 +1,9 @@
+Minimal support for multilib builds.
+
+For a little more information, see:
+<http://airs.com/ian/configure/configure_8.html>
+
+The master (and probably more up-to-date) copies of the 'config-ml.in'
+and 'symlink-tree' files are maintained in the GCC development tree
+at <http://gcc.gnu.org/svn.html>.  The same is probably true also for
+the 'multi.m4' file.
diff --git a/contrib/multilib/config-ml.in b/contrib/multilib/config-ml.in
new file mode 100644
index 000000000..11983461c
--- /dev/null
+++ b/contrib/multilib/config-ml.in
@@ -0,0 +1,877 @@
+# Configure fragment invoked in the post-target section for subdirs
+# wanting multilib support.
+#
+# Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+# 2005, 2006, 2007, 2008, 2010, 2011  Free Software Foundation, Inc.
+#
+# This file 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+#
+# Please report bugs to <gcc-bugs@gnu.org>
+# and send patches to <gcc-patches@gnu.org>.
+
+# It is advisable to support a few --enable/--disable options to let the
+# user select which libraries s/he really wants.
+#
+# Subdirectories wishing to use multilib should put the following lines
+# in the "post-target" section of configure.in.
+#
+# if [ "${srcdir}" = "." ] ; then
+#   if [ "${with_target_subdir}" != "." ] ; then
+#     . ${with_multisrctop}../../config-ml.in
+#   else
+#     . ${with_multisrctop}../config-ml.in
+#   fi
+# else
+#   . ${srcdir}/../config-ml.in
+# fi
+#
+#
+# Things are complicated because 6 separate cases must be handled:
+# 2 (native, cross) x 3 (absolute-path, relative-not-dot, dot) = 6.
+#
+# srcdir=. is special.  It must handle make programs that don't handle VPATH.
+# To implement this, a symlink tree is built for each library and for each
+# multilib subdir.
+#
+# The build tree is layed out as
+#
+# ./
+#   newlib
+#   m68020/
+#          newlib
+#          m68881/
+#                 newlib
+#
+# The nice feature about this arrangement is that inter-library references
+# in the build tree work without having to care where you are.  Note that
+# inter-library references also work in the source tree because symlink trees
+# are built when srcdir=.
+#
+# Unfortunately, trying to access the libraries in the build tree requires
+# the user to manually choose which library to use as GCC won't be able to
+# find the right one.  This is viewed as the lesser of two evils.
+#
+# Configure variables:
+# ${with_target_subdir} = "." for native, or ${target_alias} for cross.
+# Set by top level Makefile.
+# ${with_multisrctop} = how many levels of multilibs there are in the source
+# tree.  It exists to handle the case of configuring in the source tree:
+# ${srcdir} is not constant.
+# ${with_multisubdir} = name of multilib subdirectory (eg: m68020/m68881).
+#
+# Makefile variables:
+# MULTISRCTOP = number of multilib levels in source tree (+1 if cross)
+# (FIXME: note that this is different than ${with_multisrctop}.  Check out.).
+# MULTIBUILDTOP = number of multilib levels in build tree
+# MULTIDIRS = list of multilib subdirs (eg: m68000 m68020 ...)
+# (only defined in each library's main Makefile).
+# MULTISUBDIR = installed subdirectory name with leading '/' (eg: /m68000)
+# (only defined in each multilib subdir).
+
+# FIXME: Multilib is currently disabled by default for everything other than
+# newlib.  It is up to each target to turn on multilib support for the other
+# libraries as desired.
+
+# Autoconf incoming variables:
+# srcdir, host, ac_configure_args
+#
+# We *could* figure srcdir and host out, but we'd have to do work that
+# our caller has already done to figure them out and requiring these two
+# seems reasonable.
+# Note that `host' in this case is GCC's `target'.  Target libraries are
+# configured for a particular host.
+
+Makefile=${ac_file-Makefile}
+ml_config_shell=${CONFIG_SHELL-/bin/sh}
+ml_realsrcdir=${srcdir}
+
+# Scan all the arguments and set all the ones we need.
+
+ml_verbose=--verbose
+for option in ${ac_configure_args}
+do
+  # strip single quotes surrounding individual options
+  case $option in
+  \'*\') eval option=$option ;;
+  esac
+
+  case $option in
+  --*) ;;
+  -*) option=-$option ;;
+  esac
+
+  case $option in
+  --*=*)
+	optarg=`echo $option | sed -e 's/^[^=]*=//'`
+	;;
+  esac
+
+  case $option in
+  --disable-*)
+	enableopt=`echo ${option} | sed 's:^--disable-:enable_:;s:-:_:g'`
+	eval $enableopt=no
+	;;
+  --enable-*)
+	case "$option" in
+	*=*)	;;
+	*)	optarg=yes ;;
+	esac
+	enableopt=`echo ${option} | sed 's:^--::;s:=.*$::;s:-:_:g'`
+	# enable_shared and enable_static are handled by configure.
+	# Don't undo its work.
+	case $enableopt in
+	enable_shared | enable_static) ;;
+	*) eval $enableopt="$optarg" ;;
+	esac
+	;;
+  --norecursion | --no-recursion)
+	ml_norecursion=yes
+	;;
+  --silent | --sil* | --quiet | --q*)
+	ml_verbose=--silent
+	;;
+  --verbose | --v | --verb*)
+	ml_verbose=--verbose
+	;;
+  --with-*)
+	case "$option" in
+	*=*)	;;
+	*)	optarg=yes ;;
+	esac
+	withopt=`echo ${option} | sed 's:^--::;s:=.*$::;s:-:_:g'`
+	eval $withopt="$optarg"
+	;;
+  --without-*)
+	withopt=`echo ${option} | sed 's:^--::;s:out::;s:-:_:g'`
+	eval $withopt=no
+	;;
+  esac
+done
+
+# Only do this if --enable-multilib.
+if [ "${enable_multilib}" = yes ]; then
+
+# Compute whether this is the library's top level directory
+# (ie: not a multilib subdirectory, and not a subdirectory like newlib/src).
+# ${with_multisubdir} tells us we're in the right branch, but we could be
+# in a subdir of that.
+# ??? The previous version could void this test by separating the process into
+# two files: one that only the library's toplevel configure.in ran (to
+# configure the multilib subdirs), and another that all configure.in's ran to
+# update the Makefile.  It seemed reasonable to collapse all multilib support
+# into one file, but it does leave us with having to perform this test.
+ml_toplevel_p=no
+if [ -z "${with_multisubdir}" ]; then
+  if [ "${srcdir}" = "." ]; then
+    # Use ${ml_realsrcdir} instead of ${srcdir} here to account for ${subdir}.
+    # ${with_target_subdir} = "." for native, otherwise target alias.
+    if [ "${with_target_subdir}" = "." ]; then
+      if [ -f ${ml_realsrcdir}/../config-ml.in ]; then
+	ml_toplevel_p=yes
+      fi
+    else
+      if [ -f ${ml_realsrcdir}/../../config-ml.in ]; then
+	ml_toplevel_p=yes
+      fi
+    fi
+  else
+    # Use ${ml_realsrcdir} instead of ${srcdir} here to account for ${subdir}.
+    if [ -f ${ml_realsrcdir}/../config-ml.in ]; then
+      ml_toplevel_p=yes
+    fi
+  fi
+fi
+
+# If this is the library's top level directory, set multidirs to the
+# multilib subdirs to support.  This lives at the top because we need
+# `multidirs' set right away.
+
+if [ "${ml_toplevel_p}" = yes ]; then
+
+multidirs=
+for i in `${CC-gcc} --print-multi-lib 2>/dev/null`; do
+  dir=`echo $i | sed -e 's/;.*$//'`
+  if [ "${dir}" = "." ]; then
+    true
+  else
+    if [ -z "${multidirs}" ]; then
+      multidirs="${dir}"
+    else
+      multidirs="${multidirs} ${dir}"
+    fi
+  fi
+done
+
+# Target libraries are configured for the host they run on, so we check
+# $host here, not $target.
+
+case "${host}" in
+arm-*-*)
+	if [ x"$enable_fpu" = xno ]
+	then
+	  old_multidirs=${multidirs}
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "${x}" in
+	      *fpu*) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x"$enable_26bit" = xno ]
+	then
+	  old_multidirs=${multidirs}
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "${x}" in
+	      *26bit*) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x"$enable_underscore" = xno ]
+	then
+	  old_multidirs=${multidirs}
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "${x}" in
+	      *under*) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x"$enable_interwork" = xno ]
+	then
+	  old_multidirs=${multidirs}
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "${x}" in
+	      *interwork*) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_biendian = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *le* ) : ;;
+	      *be* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x"$enable_nofmult" = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *nofmult* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	;;
+m68*-*-*)
+	if [ x$enable_softfloat = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *soft-float* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_m68881 = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *m68881* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_m68000 = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *m68000* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_m68020 = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *m68020* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	;;
+mips*-*-*)
+	if [ x$enable_single_float = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *single* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_biendian = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *el* ) : ;;
+	      *eb* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_softfloat = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *soft-float* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	;;
+powerpc*-*-* | rs6000*-*-*)
+	if [ x$enable_aix64 = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *ppc64* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_pthread = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *pthread* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_softfloat = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *soft-float* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_powercpu = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      power | */power | */power/* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_powerpccpu = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *powerpc* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_powerpcos = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *mcall-linux* | *mcall-solaris* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_biendian = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *mlittle* | *mbig* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	if [ x$enable_sysv = xno ]
+	then
+	  old_multidirs="${multidirs}"
+	  multidirs=""
+	  for x in ${old_multidirs}; do
+	    case "$x" in
+	      *mcall-sysv* ) : ;;
+	      *) multidirs="${multidirs} ${x}" ;;
+	    esac
+	  done
+	fi
+	;;
+esac
+
+# Remove extraneous blanks from multidirs.
+# Tests like `if [ -n "$multidirs" ]' require it.
+multidirs=`echo "$multidirs" | sed -e 's/^[ ][ ]*//' -e 's/[ ][ ]*$//' -e 's/[ ][ ]*/ /g'`
+
+# Add code to library's top level makefile to handle building the multilib
+# subdirs.
+
+cat > Multi.tem <<\EOF
+
+PWD_COMMAND=$${PWDCMD-pwd}
+
+# FIXME: There should be an @-sign in front of the `if'.
+# Leave out until this is tested a bit more.
+multi-do:
+	if [ -z "$(MULTIDIRS)" ]; then \
+	  true; \
+	else \
+	  rootpre=`${PWD_COMMAND}`/; export rootpre; \
+	  srcrootpre=`cd $(srcdir); ${PWD_COMMAND}`/; export srcrootpre; \
+	  lib=`echo "$${rootpre}" | sed -e 's,^.*/\([^/][^/]*\)/$$,\1,'`; \
+	  compiler="$(CC)"; \
+	  for i in `$${compiler} --print-multi-lib 2>/dev/null`; do \
+	    dir=`echo $$i | sed -e 's/;.*$$//'`; \
+	    if [ "$${dir}" = "." ]; then \
+	      true; \
+	    else \
+	      if [ -d ../$${dir}/$${lib} ]; then \
+		flags=`echo $$i | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`; \
+		if (cd ../$${dir}/$${lib}; $(MAKE) $(FLAGS_TO_PASS) \
+				CFLAGS="$(CFLAGS) $${flags}" \
+				CCASFLAGS="$(CCASFLAGS) $${flags}" \
+				FCFLAGS="$(FCFLAGS) $${flags}" \
+				FFLAGS="$(FFLAGS) $${flags}" \
+				ADAFLAGS="$(ADAFLAGS) $${flags}" \
+				prefix="$(prefix)" \
+				exec_prefix="$(exec_prefix)" \
+				GCJFLAGS="$(GCJFLAGS) $${flags}" \
+				GOCFLAGS="$(GOCFLAGS) $${flags}" \
+				CXXFLAGS="$(CXXFLAGS) $${flags}" \
+				LIBCFLAGS="$(LIBCFLAGS) $${flags}" \
+				LIBCXXFLAGS="$(LIBCXXFLAGS) $${flags}" \
+				LDFLAGS="$(LDFLAGS) $${flags}" \
+				MULTIFLAGS="$${flags}" \
+				DESTDIR="$(DESTDIR)" \
+				INSTALL="$(INSTALL)" \
+				INSTALL_DATA="$(INSTALL_DATA)" \
+				INSTALL_PROGRAM="$(INSTALL_PROGRAM)" \
+				INSTALL_SCRIPT="$(INSTALL_SCRIPT)" \
+				$(DO)); then \
+		  true; \
+		else \
+		  exit 1; \
+		fi; \
+	      else true; \
+	      fi; \
+	    fi; \
+	  done; \
+	fi
+
+# FIXME: There should be an @-sign in front of the `if'.
+# Leave out until this is tested a bit more.
+multi-clean:
+	if [ -z "$(MULTIDIRS)" ]; then \
+	  true; \
+	else \
+	  lib=`${PWD_COMMAND} | sed -e 's,^.*/\([^/][^/]*\)$$,\1,'`; \
+	  for dir in : $(MULTIDIRS); do \
+	    test $$dir != : || continue; \
+EOF
+cat >>Multi.tem <<EOF
+	    if [ -f ../\$\${dir}/\$\${lib}/${Makefile} ]; then \\
+EOF
+cat >>Multi.tem <<\EOF
+	      if (cd ../$${dir}/$${lib}; $(MAKE) $(FLAGS_TO_PASS) $(DO)); \
+	      then true; \
+	      else exit 1; \
+	      fi; \
+	    else true; \
+	    fi; \
+	  done; \
+	fi
+EOF
+
+cat ${Makefile} Multi.tem > Makefile.tem
+rm -f ${Makefile} Multi.tem
+mv Makefile.tem ${Makefile}
+
+fi # ${ml_toplevel_p} = yes
+
+if [ "${ml_verbose}" = --verbose ]; then
+  echo "Adding multilib support to ${Makefile} in ${ml_realsrcdir}"
+  if [ "${ml_toplevel_p}" = yes ]; then
+    echo "multidirs=${multidirs}"
+  fi
+  echo "with_multisubdir=${with_multisubdir}"
+fi
+
+if [ "${srcdir}" = "." ]; then
+  if [ "${with_target_subdir}" != "." ]; then
+    ml_srcdotdot="../"
+  else
+    ml_srcdotdot=""
+  fi
+else
+  ml_srcdotdot=""
+fi
+
+if [ -z "${with_multisubdir}" ]; then
+  ml_subdir=
+  ml_builddotdot=
+  : # ml_srcdotdot= # already set
+else
+  ml_subdir="/${with_multisubdir}"
+  # The '[^/][^/]*' appears that way to work around a SunOS sed bug.
+  ml_builddotdot=`echo ${with_multisubdir} | sed -e 's:[^/][^/]*:..:g'`/
+  if [ "$srcdir" = "." ]; then
+    ml_srcdotdot=${ml_srcdotdot}${ml_builddotdot}
+  else
+    : # ml_srcdotdot= # already set
+  fi
+fi
+
+if [ "${ml_toplevel_p}" = yes ]; then
+  ml_do='$(MAKE)'
+  ml_clean='$(MAKE)'
+else
+  ml_do=true
+  ml_clean=true
+fi
+
+# TOP is used by newlib and should not be used elsewhere for this purpose.
+# MULTI{SRC,BUILD}TOP are the proper ones to use.  MULTISRCTOP is empty
+# when srcdir != builddir.  MULTIBUILDTOP is always some number of ../'s.
+# FIXME: newlib needs to be updated to use MULTI{SRC,BUILD}TOP so we can
+# delete TOP.  Newlib may wish to continue to use TOP for its own purposes
+# of course.
+# MULTIDIRS is non-empty for the cpu top level Makefile (eg: newlib/Makefile)
+# and lists the subdirectories to recurse into.
+# MULTISUBDIR is non-empty in each cpu subdirectory's Makefile
+# (eg: newlib/h8300h/Makefile) and is the installed subdirectory name with
+# a leading '/'.
+# MULTIDO is used for targets like all, install, and check where
+# $(FLAGS_TO_PASS) augmented with the subdir's compiler option is needed.
+# MULTICLEAN is used for the *clean targets.
+#
+# ??? It is possible to merge MULTIDO and MULTICLEAN into one.  They are
+# currently kept separate because we don't want the *clean targets to require
+# the existence of the compiler (which MULTIDO currently requires) and
+# therefore we'd have to record the directory options as well as names
+# (currently we just record the names and use --print-multi-lib to get the
+# options).
+
+sed -e "s:^TOP[ 	]*=[ 	]*\([./]*\)[ 	]*$:TOP = ${ml_builddotdot}\1:" \
+    -e "s:^MULTISRCTOP[ 	]*=.*$:MULTISRCTOP = ${ml_srcdotdot}:" \
+    -e "s:^MULTIBUILDTOP[ 	]*=.*$:MULTIBUILDTOP = ${ml_builddotdot}:" \
+    -e "s:^MULTIDIRS[ 	]*=.*$:MULTIDIRS = ${multidirs}:" \
+    -e "s:^MULTISUBDIR[ 	]*=.*$:MULTISUBDIR = ${ml_subdir}:" \
+    -e "s:^MULTIDO[ 	]*=.*$:MULTIDO = $ml_do:" \
+    -e "s:^MULTICLEAN[ 	]*=.*$:MULTICLEAN = $ml_clean:" \
+	${Makefile} > Makefile.tem
+rm -f ${Makefile}
+mv Makefile.tem ${Makefile}
+
+# If this is the library's top level, configure each multilib subdir.
+# This is done at the end because this is the loop that runs configure
+# in each multilib subdir and it seemed reasonable to finish updating the
+# Makefile before going on to configure the subdirs.
+
+if [ "${ml_toplevel_p}" = yes ]; then
+
+# We must freshly configure each subdirectory.  This bit of code is
+# actually partially stolen from the main configure script.  FIXME.
+
+if [ -n "${multidirs}" ] && [ -z "${ml_norecursion}" ]; then
+
+  if [ "${ml_verbose}" = --verbose ]; then
+    echo "Running configure in multilib subdirs ${multidirs}"
+    echo "pwd: `${PWDCMD-pwd}`"
+  fi
+
+  ml_origdir=`${PWDCMD-pwd}`
+  ml_libdir=`echo "$ml_origdir" | sed -e 's,^.*/,,'`
+  # cd to top-level-build-dir/${with_target_subdir}
+  cd ..
+
+  for ml_dir in ${multidirs}; do
+
+    if [ "${ml_verbose}" = --verbose ]; then
+      echo "Running configure in multilib subdir ${ml_dir}"
+      echo "pwd: `${PWDCMD-pwd}`"
+    fi
+
+    if [ -d ${ml_dir} ]; then true; else
+      # ``mkdir -p ${ml_dir}'' See also mkinstalldirs.
+      pathcomp=""
+      for d in `echo ":${ml_dir}" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'`; do
+        pathcomp="$pathcomp$d"
+        case "$pathcomp" in
+          -* ) pathcomp=./$pathcomp ;;
+        esac
+        if test ! -d "$pathcomp"; then
+           echo "mkdir $pathcomp" 1>&2
+           mkdir "$pathcomp" > /dev/null 2>&1 || lasterr=$?
+        fi
+        if test ! -d "$pathcomp"; then
+	   exit $lasterr
+        fi
+        pathcomp="$pathcomp/"
+      done
+    fi
+    if [ -d ${ml_dir}/${ml_libdir} ]; then true; else mkdir ${ml_dir}/${ml_libdir}; fi
+
+    # Eg: if ${ml_dir} = m68000/m68881, dotdot = ../../
+    dotdot=../`echo ${ml_dir} | sed -e 's|[^/]||g' -e 's|/|../|g'`
+
+    case ${srcdir} in
+    ".")
+      echo "Building symlink tree in `${PWDCMD-pwd}`/${ml_dir}/${ml_libdir}"
+      if [ "${with_target_subdir}" != "." ]; then
+	ml_unsubdir="../"
+      else
+	ml_unsubdir=""
+      fi
+      (cd ${ml_dir}/${ml_libdir};
+       ../${dotdot}${ml_unsubdir}symlink-tree ../${dotdot}${ml_unsubdir}${ml_libdir} "")
+      if [ -f ${ml_dir}/${ml_libdir}/${Makefile} ]; then
+	if [ x"${MAKE}" = x ]; then
+	  (cd ${ml_dir}/${ml_libdir}; make distclean)
+	else
+	  (cd ${ml_dir}/${ml_libdir}; ${MAKE} distclean)
+	fi
+      fi
+      ml_newsrcdir="."
+      ml_srcdiroption=
+      multisrctop=${dotdot}
+      ;;
+    *)
+      case "${srcdir}" in
+      /* | [A-Za-z]:[\\/]* ) # absolute path
+        ml_newsrcdir=${srcdir}
+        ;;
+      *) # otherwise relative
+        ml_newsrcdir=${dotdot}${srcdir}
+        ;;
+      esac
+      ml_srcdiroption="-srcdir=${ml_newsrcdir}"
+      multisrctop=
+      ;;
+    esac
+
+    case "${progname}" in
+    /* | [A-Za-z]:[\\/]* )     ml_recprog=${progname} ;;
+    *)      ml_recprog=${dotdot}${progname} ;;
+    esac
+
+    # FIXME: POPDIR=${PWD=`pwd`} doesn't work here.
+    ML_POPDIR=`${PWDCMD-pwd}`
+    cd ${ml_dir}/${ml_libdir}
+
+    if [ -f ${ml_newsrcdir}/configure ]; then
+      ml_recprog="${ml_newsrcdir}/configure"
+    fi
+
+    # find compiler flag corresponding to ${ml_dir}
+    for i in `${CC-gcc} --print-multi-lib 2>/dev/null`; do
+      dir=`echo $i | sed -e 's/;.*$//'`
+      if [ "${dir}" = "${ml_dir}" ]; then
+        flags=`echo $i | sed -e 's/^[^;]*;//' -e 's/@/ -/g'`
+        break
+      fi
+    done
+    ml_config_env='CC="${CC_}$flags" CXX="${CXX_}$flags" F77="${F77_}$flags" GCJ="${GCJ_}$flags" GFORTRAN="${GFORTRAN_}$flags" GOC="${GOC_}$flags"'
+
+    if [ "${with_target_subdir}" = "." ]; then
+	CC_=$CC' '
+	CXX_=$CXX' '
+	F77_=$F77' '
+	GCJ_=$GCJ' '
+	GFORTRAN_=$GFORTRAN' '
+	GOC_=$GOC' '
+    else
+	# Create a regular expression that matches any string as long
+	# as ML_POPDIR.
+	popdir_rx=`echo "${ML_POPDIR}" | sed 's,.,.,g'`
+	CC_=
+	for arg in ${CC}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    CC_="${CC_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    CC_="${CC_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    CC_="${CC_}${arg} " ;;
+	  esac
+	done
+
+	CXX_=
+	for arg in ${CXX}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    CXX_="${CXX_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    CXX_="${CXX_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    CXX_="${CXX_}${arg} " ;;
+	  esac
+	done
+
+	F77_=
+	for arg in ${F77}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    F77_="${F77_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    F77_="${F77_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    F77_="${F77_}${arg} " ;;
+	  esac
+	done
+
+	GCJ_=
+	for arg in ${GCJ}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    GCJ_="${GCJ_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    GCJ_="${GCJ_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    GCJ_="${GCJ_}${arg} " ;;
+	  esac
+	done
+
+	GFORTRAN_=
+	for arg in ${GFORTRAN}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    GFORTRAN_="${GFORTRAN_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    GFORTRAN_="${GFORTRAN_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    GFORTRAN_="${GFORTRAN_}${arg} " ;;
+	  esac
+	done
+
+	GOC_=
+	for arg in ${GOC}; do
+	  case $arg in
+	  -[BIL]"${ML_POPDIR}"/*)
+	    GOC_="${GOC_}"`echo "X${arg}" | sed -n "s/X\\(-[BIL]${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X-[BIL]${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  "${ML_POPDIR}"/*)
+	    GOC_="${GOC_}"`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`' ' ;;
+	  *)
+	    GOC_="${GOC_}${arg} " ;;
+	  esac
+	done
+
+	if test "x${LD_LIBRARY_PATH+set}" = xset; then
+	  LD_LIBRARY_PATH_=
+	  for arg in `echo "$LD_LIBRARY_PATH" | tr ':' ' '`; do
+	    case "$arg" in
+	    "${ML_POPDIR}"/*)
+	      arg=`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`
+	      ;;
+	    esac
+	    if test "x$LD_LIBRARY_PATH_" != x; then
+	      LD_LIBRARY_PATH_=$LD_LIBRARY_PATH_:$arg
+	    else
+	      LD_LIBRARY_PATH_=$arg
+	    fi
+          done
+	  ml_config_env="$ml_config_env LD_LIBRARY_PATH=$LD_LIBRARY_PATH_"
+	fi
+
+	if test "x${SHLIB_PATH+set}" = xset; then
+	  SHLIB_PATH_=
+	  for arg in `echo "$SHLIB_PATH" | tr ':' ' '`; do
+	    case "$arg" in
+	    "${ML_POPDIR}"/*)
+	      arg=`echo "X${arg}" | sed -n "s/X\\(${popdir_rx}\\).*/\\1/p"`/${ml_dir}`echo "X${arg}" | sed -n "s/X${popdir_rx}\\(.*\\)/\\1/p"`
+	      ;;
+	    esac
+	    if test "x$SHLIB_PATH_" != x; then
+	      SHLIB_PATH_=$SHLIB_PATH_:$arg
+	    else
+	      SHLIB_PATH_=$arg
+	    fi
+          done
+	  ml_config_env="$ml_config_env SHLIB_PATH=$SHLIB_PATH_"
+	fi
+    fi
+
+    if eval ${ml_config_env} ${ml_config_shell} ${ml_recprog} \
+	--with-multisubdir=${ml_dir} --with-multisrctop=${multisrctop} \
+	${ac_configure_args} ${ml_config_env} ${ml_srcdiroption} ; then
+      true
+    else
+      exit 1
+    fi
+
+    cd "${ML_POPDIR}"
+
+  done
+
+  cd "${ml_origdir}"
+fi
+
+fi # ${ml_toplevel_p} = yes
+fi # ${enable_multilib} = yes
diff --git a/contrib/multilib/multi.m4 b/contrib/multilib/multi.m4
new file mode 100644
index 000000000..98417679f
--- /dev/null
+++ b/contrib/multilib/multi.m4
@@ -0,0 +1,65 @@
+##                                                          -*- Autoconf -*-
+# Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 6
+
+# AM_ENABLE_MULTILIB([MAKEFILE], [REL-TO-TOP-SRCDIR])
+# ---------------------------------------------------
+# Add --enable-multilib to configure.
+AC_DEFUN([AM_ENABLE_MULTILIB],
+[# Default to --enable-multilib
+AC_ARG_ENABLE(multilib,
+[  --enable-multilib       build many library versions (default)],
+[case "$enableval" in
+  yes) multilib=yes ;;
+  no)  multilib=no ;;
+  *)   AC_MSG_ERROR([bad value $enableval for multilib option]) ;;
+ esac],
+	      [multilib=yes])
+
+# We may get other options which we leave undocumented:
+# --with-target-subdir, --with-multisrctop, --with-multisubdir
+# See config-ml.in if you want the gory details.
+
+if test "$srcdir" = "."; then
+  if test "$with_target_subdir" != "."; then
+    multi_basedir="$srcdir/$with_multisrctop../$2"
+  else
+    multi_basedir="$srcdir/$with_multisrctop$2"
+  fi
+else
+  multi_basedir="$srcdir/$2"
+fi
+AC_SUBST(multi_basedir)
+
+# Even if the default multilib is not a cross compilation,
+# it may be that some of the other multilibs are.
+if test $cross_compiling = no && test $multilib = yes \
+   && test "x${with_multisubdir}" != x ; then
+   cross_compiling=maybe
+fi
+
+AC_OUTPUT_COMMANDS([
+# Only add multilib support code if we just rebuilt the top-level
+# Makefile.
+case " $CONFIG_FILES " in
+ *" ]m4_default([$1],Makefile)[ "*)
+   ac_file=]m4_default([$1],Makefile)[ . ${multi_basedir}/config-ml.in
+   ;;
+esac],
+		   [
+srcdir="$srcdir"
+host="$host"
+target="$target"
+with_multisubdir="$with_multisubdir"
+with_multisrctop="$with_multisrctop"
+with_target_subdir="$with_target_subdir"
+ac_configure_args="${multilib_arg} ${ac_configure_args}"
+multi_basedir="$multi_basedir"
+CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
+CC="$CC"])])dnl
diff --git a/contrib/multilib/multilib.am b/contrib/multilib/multilib.am
new file mode 100644
index 000000000..d829d73c3
--- /dev/null
+++ b/contrib/multilib/multilib.am
@@ -0,0 +1,47 @@
+## automake - create Makefile.in from Makefile.am
+
+## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+## 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software
+## Foundation, Inc.
+## This Makefile.in is free software; the Free Software Foundation
+## gives unlimited permission to copy and/or distribute it,
+## with or without modifications, as long as this notice is preserved.
+
+## 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.
+
+MULTISRCTOP =
+MULTIBUILDTOP =
+MULTIDIRS =
+MULTISUBDIR =
+MULTIDO = true
+MULTICLEAN = true
+
+# GNU Make needs to see an explicit $(MAKE) variable in the command it
+# runs to enable its job server during parallel builds.  Hence the
+# comments below.
+all-multi:
+	$(MULTIDO) DO=all multi-do # $(MAKE)
+install-multi:
+	$(MULTIDO) DO=install multi-do # $(MAKE)
+mostlyclean-multi:
+	$(MULTICLEAN) DO=mostlyclean multi-clean # $(MAKE)
+clean-multi:
+	$(MULTICLEAN) DO=clean multi-clean # $(MAKE)
+distclean-multi:
+	$(MULTICLEAN) DO=distclean multi-clean # $(MAKE)
+maintainer-clean-multi:
+	$(MULTICLEAN) DO=maintainer-clean multi-clean # $(MAKE)
+
+.MAKE .PHONY: all-multi clean-multi distclean-multi install-am \
+	      install-multi maintainer-clean-multi mostlyclean-multi
+
+install-exec-local: install-multi
+
+all-local: all-multi
+mostlyclean-local: mostlyclean-multi
+clean-local: clean-multi
+distclean-local: distclean-multi
+maintainer-clean-local: maintainer-clean-multi
diff --git a/contrib/multilib/symlink-tree b/contrib/multilib/symlink-tree
new file mode 100755
index 000000000..a9d50831b
--- /dev/null
+++ b/contrib/multilib/symlink-tree
@@ -0,0 +1,78 @@
+#!/bin/sh
+# Create a symlink tree.
+#
+# Copyright (C) 1995, 2000, 2003  Free Software Foundation, Inc.
+#
+# This file 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 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301, USA.
+#
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+#
+# Please report bugs to <gcc-bugs@gnu.org>
+# and send patches to <gcc-patches@gnu.org>.
+
+# Syntax: symlink-tree srcdir "ignore1 ignore2 ..."
+#
+# where srcdir is the directory to create a symlink tree to,
+# and "ignoreN" is a list of files/directories to ignore.
+
+prog=$0
+srcdir=$1
+ignore="$2"
+
+if test $# -lt 1; then
+  echo "symlink-tree error:  Usage: symlink-tree srcdir \"ignore1 ignore2 ...\""
+  exit 1
+fi
+
+ignore_additional=". .. CVS"
+
+# If we were invoked with a relative path name, adjust ${prog} to work
+# in subdirs.
+case ${prog} in
+/* | [A-Za-z]:[\\/]*) ;;
+*) prog=../${prog} ;;
+esac
+
+# Set newsrcdir to something subdirectories can use.
+case ${srcdir} in
+/* | [A-Za-z]:[\\/]*) newsrcdir=${srcdir} ;;
+*) newsrcdir=../${srcdir} ;;
+esac
+
+for f in `ls -a ${srcdir}`; do
+  if [ -d ${srcdir}/$f ]; then
+    found=
+    for i in ${ignore} ${ignore_additional}; do
+      if [ "$f" = "$i" ]; then
+	found=yes
+      fi
+    done
+    if [ -z "${found}" ]; then
+      echo "$f		..working in"
+      if [ -d $f ]; then true; else mkdir $f; fi
+      (cd $f; ${prog} ${newsrcdir}/$f "${ignore}")
+    fi
+  else
+    echo "$f		..linked"
+    rm -f $f
+    ln -s ${srcdir}/$f .
+  fi
+done
+
+exit 0