acinclude.m4 - platform/external/libunwind - Gitiles

 AC_DEFUN([LIBUNWIND___THREAD],
 [dnl Check whether the compiler supports the __thread keyword.
 if test "x$use__thread" != xno; then
   AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
 		 [cat > conftest.c <<\EOF
     __thread int a = 42;
 EOF
   if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
     libc_cv_gcc___thread=yes
   else
     libc_cv_gcc___thread=no
   fi
   rm -f conftest*])
   if test "$libc_cv_gcc___thread" = yes; then
     AC_DEFINE(HAVE___THREAD, 1,
 	[Define to 1 if __thread keyword is supported by the C compiler.])
   fi
 else
   libc_cv_gcc___thread=no
 fi])

 ## libtool.m4 - Configure libtool for the target system. -*-Shell-script-*-
 ## Copyright (C) 1996-1999, 2000 Free Software Foundation, Inc.
 ## Originally by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
 ##
 ## 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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.

 # serial 40 AC_PROG_LIBTOOL
 AC_DEFUN(AC_PROG_LIBTOOL,
 [AC_REQUIRE([AC_LIBTOOL_SETUP])dnl

 # Save cache, so that ltconfig can load it
 AC_CACHE_SAVE

 # Actually configure libtool.  ac_aux_dir is where install-sh is found.
 CC="$CC" CFLAGS="$CFLAGS" CPPFLAGS="$CPPFLAGS" \
 LD="$LD" LDFLAGS="$LDFLAGS" LIBS="$LIBS" \
 LN_S="$LN_S" NM="$NM" RANLIB="$RANLIB" \
 DLLTOOL="$DLLTOOL" AS="$AS" OBJDUMP="$OBJDUMP" \
 ${CONFIG_SHELL-/bin/sh} $ac_aux_dir/ltconfig --no-reexec \
 $libtool_flags --no-verify $ac_aux_dir/ltmain.sh $lt_target \
 || AC_MSG_ERROR([libtool configure failed])

 # Reload cache, that may have been modified by ltconfig
 AC_CACHE_LOAD

 # This can be used to rebuild libtool when needed
 LIBTOOL_DEPS="$ac_aux_dir/ltconfig $ac_aux_dir/ltmain.sh"

 # Always use our own libtool.
 LIBTOOL='$(SHELL) $(top_builddir)/libtool'
 AC_SUBST(LIBTOOL)dnl

 # Redirect the config.log output again, so that the ltconfig log is not
 # clobbered by the next message.
 exec 5>>./config.log
 ])

 AC_DEFUN(AC_LIBTOOL_SETUP,
 [AC_PREREQ(2.13)dnl
 AC_REQUIRE([AC_ENABLE_SHARED])dnl
 AC_REQUIRE([AC_ENABLE_STATIC])dnl
 AC_REQUIRE([AC_ENABLE_FAST_INSTALL])dnl
 AC_REQUIRE([AC_CANONICAL_HOST])dnl
 AC_REQUIRE([AC_CANONICAL_BUILD])dnl
 AC_REQUIRE([AC_PROG_RANLIB])dnl
 AC_REQUIRE([AC_PROG_CC])dnl
 AC_REQUIRE([AC_PROG_LD])dnl
 AC_REQUIRE([AC_PROG_NM])dnl
 AC_REQUIRE([AC_PROG_LN_S])dnl
 dnl

 case "$target" in
 NONE) lt_target="$host" ;;
 *) lt_target="$target" ;;
 esac

 # Check for any special flags to pass to ltconfig.
 #
 # the following will cause an existing older ltconfig to fail, so
 # we ignore this at the expense of the cache file... Checking this
 # will just take longer ... bummer!
 #libtool_flags="--cache-file=$cache_file"
 #
 test "$enable_shared" = no && libtool_flags="$libtool_flags --disable-shared"
 test "$enable_static" = no && libtool_flags="$libtool_flags --disable-static"
 test "$enable_fast_install" = no && libtool_flags="$libtool_flags --disable-fast-install"
 test "$ac_cv_prog_gcc" = yes && libtool_flags="$libtool_flags --with-gcc"
 test "$ac_cv_prog_gnu_ld" = yes && libtool_flags="$libtool_flags --with-gnu-ld"
 ifdef([AC_PROVIDE_AC_LIBTOOL_DLOPEN],
 [libtool_flags="$libtool_flags --enable-dlopen"])
 ifdef([AC_PROVIDE_AC_LIBTOOL_WIN32_DLL],
 [libtool_flags="$libtool_flags --enable-win32-dll"])
 AC_ARG_ENABLE(libtool-lock,
   [  --disable-libtool-lock  avoid locking (might break parallel builds)])
 test "x$enable_libtool_lock" = xno && libtool_flags="$libtool_flags --disable-lock"
 test x"$silent" = xyes && libtool_flags="$libtool_flags --silent"

 # Some flags need to be propagated to the compiler or linker for good
 # libtool support.
 case "$lt_target" in
 *-*-irix6*)
   # Find out which ABI we are using.
   echo '[#]line __oline__ "configure"' > conftest.$ac_ext
   if AC_TRY_EVAL(ac_compile); then
     case "`/usr/bin/file conftest.o`" in
     *32-bit*)
       LD="${LD-ld} -32"
       ;;
     *N32*)
       LD="${LD-ld} -n32"
       ;;
     *64-bit*)
       LD="${LD-ld} -64"
       ;;
     esac
   fi
   rm -rf conftest*
   ;;

 *-*-sco3.2v5*)
   # On SCO OpenServer 5, we need -belf to get full-featured binaries.
   SAVE_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -belf"
   AC_CACHE_CHECK([whether the C compiler needs -belf], lt_cv_cc_needs_belf,
     [AC_TRY_LINK([],[],[lt_cv_cc_needs_belf=yes],[lt_cv_cc_needs_belf=no])])
   if test x"$lt_cv_cc_needs_belf" != x"yes"; then
     # this is probably gcc 2.8.0, egcs 1.0 or newer; no need for -belf
     CFLAGS="$SAVE_CFLAGS"
   fi
   ;;

 ifdef([AC_PROVIDE_AC_LIBTOOL_WIN32_DLL],
 [*-*-cygwin* | *-*-mingw*)
   AC_CHECK_TOOL(DLLTOOL, dlltool, false)
   AC_CHECK_TOOL(AS, as, false)
   AC_CHECK_TOOL(OBJDUMP, objdump, false)
   ;;
 ])
 esac
 ])

 # AC_LIBTOOL_DLOPEN - enable checks for dlopen support
 AC_DEFUN(AC_LIBTOOL_DLOPEN, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])])

 # AC_LIBTOOL_WIN32_DLL - declare package support for building win32 dll's
 AC_DEFUN(AC_LIBTOOL_WIN32_DLL, [AC_BEFORE([$0], [AC_LIBTOOL_SETUP])])

 # AC_ENABLE_SHARED - implement the --enable-shared flag
 # Usage: AC_ENABLE_SHARED[(DEFAULT)]
 #   Where DEFAULT is either `yes' or `no'.  If omitted, it defaults to
 #   `yes'.
 AC_DEFUN(AC_ENABLE_SHARED, [dnl
 define([AC_ENABLE_SHARED_DEFAULT], ifelse($1, no, no, yes))dnl
 AC_ARG_ENABLE(shared,
 changequote(<<, >>)dnl
 <<  --enable-shared[=PKGS]  build shared libraries [default=>>AC_ENABLE_SHARED_DEFAULT],
 changequote([, ])dnl
 [p=${PACKAGE-default}
 case "$enableval" in
 yes) enable_shared=yes ;;
 no) enable_shared=no ;;
 *)
   enable_shared=no
   # Look at the argument we got.  We use all the common list separators.
   IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
   for pkg in $enableval; do
     if test "X$pkg" = "X$p"; then
       enable_shared=yes
     fi
   done
   IFS="$ac_save_ifs"
   ;;
 esac],
 enable_shared=AC_ENABLE_SHARED_DEFAULT)dnl
 ])

 # AC_DISABLE_SHARED - set the default shared flag to --disable-shared
 AC_DEFUN(AC_DISABLE_SHARED, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
 AC_ENABLE_SHARED(no)])

 # AC_ENABLE_STATIC - implement the --enable-static flag
 # Usage: AC_ENABLE_STATIC[(DEFAULT)]
 #   Where DEFAULT is either `yes' or `no'.  If omitted, it defaults to
 #   `yes'.
 AC_DEFUN(AC_ENABLE_STATIC, [dnl
 define([AC_ENABLE_STATIC_DEFAULT], ifelse($1, no, no, yes))dnl
 AC_ARG_ENABLE(static,
 changequote(<<, >>)dnl
 <<  --enable-static[=PKGS]  build static libraries [default=>>AC_ENABLE_STATIC_DEFAULT],
 changequote([, ])dnl
 [p=${PACKAGE-default}
 case "$enableval" in
 yes) enable_static=yes ;;
 no) enable_static=no ;;
 *)
   enable_static=no
   # Look at the argument we got.  We use all the common list separators.
   IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
   for pkg in $enableval; do
     if test "X$pkg" = "X$p"; then
       enable_static=yes
     fi
   done
   IFS="$ac_save_ifs"
   ;;
 esac],
 enable_static=AC_ENABLE_STATIC_DEFAULT)dnl
 ])

 # AC_DISABLE_STATIC - set the default static flag to --disable-static
 AC_DEFUN(AC_DISABLE_STATIC, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
 AC_ENABLE_STATIC(no)])


 # AC_ENABLE_FAST_INSTALL - implement the --enable-fast-install flag
 # Usage: AC_ENABLE_FAST_INSTALL[(DEFAULT)]
 #   Where DEFAULT is either `yes' or `no'.  If omitted, it defaults to
 #   `yes'.
 AC_DEFUN(AC_ENABLE_FAST_INSTALL, [dnl
 define([AC_ENABLE_FAST_INSTALL_DEFAULT], ifelse($1, no, no, yes))dnl
 AC_ARG_ENABLE(fast-install,
 changequote(<<, >>)dnl
 <<  --enable-fast-install[=PKGS]  optimize for fast installation [default=>>AC_ENABLE_FAST_INSTALL_DEFAULT],
 changequote([, ])dnl
 [p=${PACKAGE-default}
 case "$enableval" in
 yes) enable_fast_install=yes ;;
 no) enable_fast_install=no ;;
 *)
   enable_fast_install=no
   # Look at the argument we got.  We use all the common list separators.
   IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
   for pkg in $enableval; do
     if test "X$pkg" = "X$p"; then
       enable_fast_install=yes
     fi
   done
   IFS="$ac_save_ifs"
   ;;
 esac],
 enable_fast_install=AC_ENABLE_FAST_INSTALL_DEFAULT)dnl
 ])

 # AC_ENABLE_FAST_INSTALL - set the default to --disable-fast-install
 AC_DEFUN(AC_DISABLE_FAST_INSTALL, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
 AC_ENABLE_FAST_INSTALL(no)])

 # AC_PROG_LD - find the path to the GNU or non-GNU linker
 AC_DEFUN(AC_PROG_LD,
 [AC_ARG_WITH(gnu-ld,
 [  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]],
 test "$withval" = no || with_gnu_ld=yes, with_gnu_ld=no)
 AC_REQUIRE([AC_PROG_CC])dnl
 AC_REQUIRE([AC_CANONICAL_HOST])dnl
 AC_REQUIRE([AC_CANONICAL_BUILD])dnl
 ac_prog=ld
 if test "$ac_cv_prog_gcc" = yes; then
   # Check if gcc -print-prog-name=ld gives a path.
   AC_MSG_CHECKING([for ld used by GCC])
   ac_prog=`($CC -print-prog-name=ld) 2>&5`
   case "$ac_prog" in
     # Accept absolute paths.
 changequote(,)dnl
     [\\/]* | [A-Za-z]:[\\/]*)
       re_direlt='/[^/][^/]*/\.\./'
 changequote([,])dnl
       # Canonicalize the path of ld
       ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
       while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
 	ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
       done
       test -z "$LD" && LD="$ac_prog"
       ;;
   "")
     # If it fails, then pretend we aren't using GCC.
     ac_prog=ld
     ;;
   *)
     # If it is relative, then search for the first ld in PATH.
     with_gnu_ld=unknown
     ;;
   esac
 elif test "$with_gnu_ld" = yes; then
   AC_MSG_CHECKING([for GNU ld])
 else
   AC_MSG_CHECKING([for non-GNU ld])
 fi
 AC_CACHE_VAL(ac_cv_path_LD,
 [if test -z "$LD"; then
   IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
   for ac_dir in $PATH; do
     test -z "$ac_dir" && ac_dir=.
     if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
       ac_cv_path_LD="$ac_dir/$ac_prog"
       # Check to see if the program is GNU ld.  I'd rather use --version,
       # but apparently some GNU ld's only accept -v.
       # Break only if it was the GNU/non-GNU ld that we prefer.
       if "$ac_cv_path_LD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
 	test "$with_gnu_ld" != no && break
       else
 	test "$with_gnu_ld" != yes && break
       fi
     fi
   done
   IFS="$ac_save_ifs"
 else
   ac_cv_path_LD="$LD" # Let the user override the test with a path.
 fi])
 LD="$ac_cv_path_LD"
 if test -n "$LD"; then
   AC_MSG_RESULT($LD)
 else
   AC_MSG_RESULT(no)
 fi
 test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
 AC_PROG_LD_GNU
 ])

 AC_DEFUN(AC_PROG_LD_GNU,
 [AC_CACHE_CHECK([if the linker ($LD) is GNU ld], ac_cv_prog_gnu_ld,
 [# I'd rather use --version here, but apparently some GNU ld's only accept -v.
 if $LD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
   ac_cv_prog_gnu_ld=yes
 else
   ac_cv_prog_gnu_ld=no
 fi])
 ])

 # AC_PROG_NM - find the path to a BSD-compatible name lister
 AC_DEFUN(AC_PROG_NM,
 [AC_MSG_CHECKING([for BSD-compatible nm])
 AC_CACHE_VAL(ac_cv_path_NM,
 [if test -n "$NM"; then
   # Let the user override the test.
   ac_cv_path_NM="$NM"
 else
   IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
   for ac_dir in $PATH /usr/ccs/bin /usr/ucb /bin; do
     test -z "$ac_dir" && ac_dir=.
     if test -f $ac_dir/nm || test -f $ac_dir/nm$ac_exeext ; then
       # Check to see if the nm accepts a BSD-compat flag.
       # Adding the `sed 1q' prevents false positives on HP-UX, which says:
       #   nm: unknown option "B" ignored
       if ($ac_dir/nm -B /dev/null 2>&1 | sed '1q'; exit 0) | egrep /dev/null >/dev/null; then
 	ac_cv_path_NM="$ac_dir/nm -B"
 	break
       elif ($ac_dir/nm -p /dev/null 2>&1 | sed '1q'; exit 0) | egrep /dev/null >/dev/null; then
 	ac_cv_path_NM="$ac_dir/nm -p"
 	break
       else
 	ac_cv_path_NM=${ac_cv_path_NM="$ac_dir/nm"} # keep the first match, but
 	continue # so that we can try to find one that supports BSD flags
       fi
     fi
   done
   IFS="$ac_save_ifs"
   test -z "$ac_cv_path_NM" && ac_cv_path_NM=nm
 fi])
 NM="$ac_cv_path_NM"
 AC_MSG_RESULT([$NM])
 ])

 # AC_CHECK_LIBM - check for math library
 AC_DEFUN(AC_CHECK_LIBM,
 [AC_REQUIRE([AC_CANONICAL_HOST])dnl
 LIBM=
 case "$lt_target" in
 *-*-beos* | *-*-cygwin*)
   # These system don't have libm
   ;;
 *-ncr-sysv4.3*)
   AC_CHECK_LIB(mw, _mwvalidcheckl, LIBM="-lmw")
   AC_CHECK_LIB(m, main, LIBM="$LIBM -lm")
   ;;
 *)
   AC_CHECK_LIB(m, main, LIBM="-lm")
   ;;
 esac
 ])

 # AC_LIBLTDL_CONVENIENCE[(dir)] - sets LIBLTDL to the link flags for
 # the libltdl convenience library and INCLTDL to the include flags for
 # the libltdl header and adds --enable-ltdl-convenience to the
 # configure arguments.  Note that LIBLTDL and INCLTDL are not
 # AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called.  If DIR is not
 # provided, it is assumed to be `libltdl'.  LIBLTDL will be prefixed
 # with '${top_builddir}/' and INCLTDL will be prefixed with
 # '${top_srcdir}/' (note the single quotes!).  If your package is not
 # flat and you're not using automake, define top_builddir and
 # top_srcdir appropriately in the Makefiles.
 AC_DEFUN(AC_LIBLTDL_CONVENIENCE, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
   case "$enable_ltdl_convenience" in
   no) AC_MSG_ERROR([this package needs a convenience libltdl]) ;;
   "") enable_ltdl_convenience=yes
       ac_configure_args="$ac_configure_args --enable-ltdl-convenience" ;;
   esac
   LIBLTDL='${top_builddir}/'ifelse($#,1,[$1],['libltdl'])/libltdlc.la
   INCLTDL='-I${top_srcdir}/'ifelse($#,1,[$1],['libltdl'])
 ])

 # AC_LIBLTDL_INSTALLABLE[(dir)] - sets LIBLTDL to the link flags for
 # the libltdl installable library and INCLTDL to the include flags for
 # the libltdl header and adds --enable-ltdl-install to the configure
 # arguments.  Note that LIBLTDL and INCLTDL are not AC_SUBSTed, nor is
 # AC_CONFIG_SUBDIRS called.  If DIR is not provided and an installed
 # libltdl is not found, it is assumed to be `libltdl'.  LIBLTDL will
 # be prefixed with '${top_builddir}/' and INCLTDL will be prefixed
 # with '${top_srcdir}/' (note the single quotes!).  If your package is
 # not flat and you're not using automake, define top_builddir and
 # top_srcdir appropriately in the Makefiles.
 # In the future, this macro may have to be called after AC_PROG_LIBTOOL.
 AC_DEFUN(AC_LIBLTDL_INSTALLABLE, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
   AC_CHECK_LIB(ltdl, main,
   [test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
   [if test x"$enable_ltdl_install" = xno; then
      AC_MSG_WARN([libltdl not installed, but installation disabled])
    else
      enable_ltdl_install=yes
    fi
   ])
   if test x"$enable_ltdl_install" = x"yes"; then
     ac_configure_args="$ac_configure_args --enable-ltdl-install"
     LIBLTDL='${top_builddir}/'ifelse($#,1,[$1],['libltdl'])/libltdl.la
     INCLTDL='-I${top_srcdir}/'ifelse($#,1,[$1],['libltdl'])
   else
     ac_configure_args="$ac_configure_args --enable-ltdl-install=no"
     LIBLTDL="-lltdl"
     INCLTDL=
   fi
 ])

 dnl old names
 AC_DEFUN(AM_PROG_LIBTOOL, [indir([AC_PROG_LIBTOOL])])dnl
 AC_DEFUN(AM_ENABLE_SHARED, [indir([AC_ENABLE_SHARED], $@)])dnl
 AC_DEFUN(AM_ENABLE_STATIC, [indir([AC_ENABLE_STATIC], $@)])dnl
 AC_DEFUN(AM_DISABLE_SHARED, [indir([AC_DISABLE_SHARED], $@)])dnl
 AC_DEFUN(AM_DISABLE_STATIC, [indir([AC_DISABLE_STATIC], $@)])dnl
 AC_DEFUN(AM_PROG_LD, [indir([AC_PROG_LD])])dnl
 AC_DEFUN(AM_PROG_NM, [indir([AC_PROG_NM])])dnl

 dnl This is just to silence aclocal about the macro not being used
 ifelse([AC_DISABLE_FAST_INSTALL])dnl
	AC_DEFUN([LIBUNWIND___THREAD],
	[dnl Check whether the compiler supports the __thread keyword.
	if test "x$use__thread" != xno; then
	AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
	[cat > conftest.c <<\EOF
	__thread int a = 42;
	EOF
	if AC_TRY_COMMAND([${CC-cc} $CFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
	libc_cv_gcc___thread=yes
	else
	libc_cv_gcc___thread=no
	fi
	rm -f conftest*])
	if test "$libc_cv_gcc___thread" = yes; then
	AC_DEFINE(HAVE___THREAD, 1,
	[Define to 1 if __thread keyword is supported by the C compiler.])
	fi
	else
	libc_cv_gcc___thread=no
	fi])

	## libtool.m4 - Configure libtool for the target system. --Shell-script--
	## Copyright (C) 1996-1999, 2000 Free Software Foundation, Inc.
	## Originally by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
	##
	## 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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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.

	# serial 40 AC_PROG_LIBTOOL
	AC_DEFUN(AC_PROG_LIBTOOL,
	[AC_REQUIRE([AC_LIBTOOL_SETUP])dnl

	# Save cache, so that ltconfig can load it
	AC_CACHE_SAVE

	# Actually configure libtool. ac_aux_dir is where install-sh is found.
	CC="$CC" CFLAGS="$CFLAGS" CPPFLAGS="$CPPFLAGS" \
	LD="$LD" LDFLAGS="$LDFLAGS" LIBS="$LIBS" \
	LN_S="$LN_S" NM="$NM" RANLIB="$RANLIB" \
	DLLTOOL="$DLLTOOL" AS="$AS" OBJDUMP="$OBJDUMP" \
	${CONFIG_SHELL-/bin/sh} $ac_aux_dir/ltconfig --no-reexec \
	$libtool_flags --no-verify $ac_aux_dir/ltmain.sh $lt_target \
	\|\| AC_MSG_ERROR([libtool configure failed])

	# Reload cache, that may have been modified by ltconfig
	AC_CACHE_LOAD

	# This can be used to rebuild libtool when needed
	LIBTOOL_DEPS="$ac_aux_dir/ltconfig $ac_aux_dir/ltmain.sh"

	# Always use our own libtool.
	LIBTOOL='$(SHELL) $(top_builddir)/libtool'
	AC_SUBST(LIBTOOL)dnl

	# Redirect the config.log output again, so that the ltconfig log is not
	# clobbered by the next message.
	exec 5>>./config.log
	])

	AC_DEFUN(AC_LIBTOOL_SETUP,
	[AC_PREREQ(2.13)dnl
	AC_REQUIRE([AC_ENABLE_SHARED])dnl
	AC_REQUIRE([AC_ENABLE_STATIC])dnl
	AC_REQUIRE([AC_ENABLE_FAST_INSTALL])dnl
	AC_REQUIRE([AC_CANONICAL_HOST])dnl
	AC_REQUIRE([AC_CANONICAL_BUILD])dnl
	AC_REQUIRE([AC_PROG_RANLIB])dnl
	AC_REQUIRE([AC_PROG_CC])dnl
	AC_REQUIRE([AC_PROG_LD])dnl
	AC_REQUIRE([AC_PROG_NM])dnl
	AC_REQUIRE([AC_PROG_LN_S])dnl
	dnl

	case "$target" in
	NONE) lt_target="$host" ;;
	*) lt_target="$target" ;;
	esac

	# Check for any special flags to pass to ltconfig.
	#
	# the following will cause an existing older ltconfig to fail, so
	# we ignore this at the expense of the cache file... Checking this
	# will just take longer ... bummer!
	#libtool_flags="--cache-file=$cache_file"
	#
	test "$enable_shared" = no && libtool_flags="$libtool_flags --disable-shared"
	test "$enable_static" = no && libtool_flags="$libtool_flags --disable-static"
	test "$enable_fast_install" = no && libtool_flags="$libtool_flags --disable-fast-install"
	test "$ac_cv_prog_gcc" = yes && libtool_flags="$libtool_flags --with-gcc"
	test "$ac_cv_prog_gnu_ld" = yes && libtool_flags="$libtool_flags --with-gnu-ld"
	ifdef([AC_PROVIDE_AC_LIBTOOL_DLOPEN],
	[libtool_flags="$libtool_flags --enable-dlopen"])
	ifdef([AC_PROVIDE_AC_LIBTOOL_WIN32_DLL],
	[libtool_flags="$libtool_flags --enable-win32-dll"])
	AC_ARG_ENABLE(libtool-lock,
	[ --disable-libtool-lock avoid locking (might break parallel builds)])
	test "x$enable_libtool_lock" = xno && libtool_flags="$libtool_flags --disable-lock"
	test x"$silent" = xyes && libtool_flags="$libtool_flags --silent"

	# Some flags need to be propagated to the compiler or linker for good
	# libtool support.
	case "$lt_target" in
	--irix6*)
	# Find out which ABI we are using.
	echo '[#]line __oline__ "configure"' > conftest.$ac_ext
	if AC_TRY_EVAL(ac_compile); then
	case "`/usr/bin/file conftest.o`" in
	32-bit)
	LD="${LD-ld} -32"
	;;
	N32)
	LD="${LD-ld} -n32"
	;;
	64-bit)
	LD="${LD-ld} -64"
	;;
	esac
	fi
	rm -rf conftest*
	;;

	--sco3.2v5*)
	# On SCO OpenServer 5, we need -belf to get full-featured binaries.
	SAVE_CFLAGS="$CFLAGS"
	CFLAGS="$CFLAGS -belf"
	AC_CACHE_CHECK([whether the C compiler needs -belf], lt_cv_cc_needs_belf,
	[AC_TRY_LINK([],[],[lt_cv_cc_needs_belf=yes],[lt_cv_cc_needs_belf=no])])
	if test x"$lt_cv_cc_needs_belf" != x"yes"; then
	# this is probably gcc 2.8.0, egcs 1.0 or newer; no need for -belf
	CFLAGS="$SAVE_CFLAGS"
	fi
	;;

	ifdef([AC_PROVIDE_AC_LIBTOOL_WIN32_DLL],
	[--cygwin* \| --mingw*)
	AC_CHECK_TOOL(DLLTOOL, dlltool, false)
	AC_CHECK_TOOL(AS, as, false)
	AC_CHECK_TOOL(OBJDUMP, objdump, false)
	;;
	])
	esac
	])

	# AC_LIBTOOL_DLOPEN - enable checks for dlopen support
	AC_DEFUN(AC_LIBTOOL_DLOPEN, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])])

	# AC_LIBTOOL_WIN32_DLL - declare package support for building win32 dll's
	AC_DEFUN(AC_LIBTOOL_WIN32_DLL, [AC_BEFORE([$0], [AC_LIBTOOL_SETUP])])

	# AC_ENABLE_SHARED - implement the --enable-shared flag
	# Usage: AC_ENABLE_SHARED[(DEFAULT)]
	# Where DEFAULT is either `yes' or `no'. If omitted, it defaults to
	# `yes'.
	AC_DEFUN(AC_ENABLE_SHARED, [dnl
	define([AC_ENABLE_SHARED_DEFAULT], ifelse($1, no, no, yes))dnl
	AC_ARG_ENABLE(shared,
	changequote(<<, >>)dnl
	<< --enable-shared[=PKGS] build shared libraries [default=>>AC_ENABLE_SHARED_DEFAULT],
	changequote([, ])dnl
	[p=${PACKAGE-default}
	case "$enableval" in
	yes) enable_shared=yes ;;
	no) enable_shared=no ;;
	*)
	enable_shared=no
	# Look at the argument we got. We use all the common list separators.
	IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
	for pkg in $enableval; do
	if test "X$pkg" = "X$p"; then
	enable_shared=yes
	fi
	done
	IFS="$ac_save_ifs"
	;;
	esac],
	enable_shared=AC_ENABLE_SHARED_DEFAULT)dnl
	])

	# AC_DISABLE_SHARED - set the default shared flag to --disable-shared
	AC_DEFUN(AC_DISABLE_SHARED, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
	AC_ENABLE_SHARED(no)])

	# AC_ENABLE_STATIC - implement the --enable-static flag
	# Usage: AC_ENABLE_STATIC[(DEFAULT)]
	# Where DEFAULT is either `yes' or `no'. If omitted, it defaults to
	# `yes'.
	AC_DEFUN(AC_ENABLE_STATIC, [dnl
	define([AC_ENABLE_STATIC_DEFAULT], ifelse($1, no, no, yes))dnl
	AC_ARG_ENABLE(static,
	changequote(<<, >>)dnl
	<< --enable-static[=PKGS] build static libraries [default=>>AC_ENABLE_STATIC_DEFAULT],
	changequote([, ])dnl
	[p=${PACKAGE-default}
	case "$enableval" in
	yes) enable_static=yes ;;
	no) enable_static=no ;;
	*)
	enable_static=no
	# Look at the argument we got. We use all the common list separators.
	IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
	for pkg in $enableval; do
	if test "X$pkg" = "X$p"; then
	enable_static=yes
	fi
	done
	IFS="$ac_save_ifs"
	;;
	esac],
	enable_static=AC_ENABLE_STATIC_DEFAULT)dnl
	])

	# AC_DISABLE_STATIC - set the default static flag to --disable-static
	AC_DEFUN(AC_DISABLE_STATIC, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
	AC_ENABLE_STATIC(no)])


	# AC_ENABLE_FAST_INSTALL - implement the --enable-fast-install flag
	# Usage: AC_ENABLE_FAST_INSTALL[(DEFAULT)]
	# Where DEFAULT is either `yes' or `no'. If omitted, it defaults to
	# `yes'.
	AC_DEFUN(AC_ENABLE_FAST_INSTALL, [dnl
	define([AC_ENABLE_FAST_INSTALL_DEFAULT], ifelse($1, no, no, yes))dnl
	AC_ARG_ENABLE(fast-install,
	changequote(<<, >>)dnl
	<< --enable-fast-install[=PKGS] optimize for fast installation [default=>>AC_ENABLE_FAST_INSTALL_DEFAULT],
	changequote([, ])dnl
	[p=${PACKAGE-default}
	case "$enableval" in
	yes) enable_fast_install=yes ;;
	no) enable_fast_install=no ;;
	*)
	enable_fast_install=no
	# Look at the argument we got. We use all the common list separators.
	IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
	for pkg in $enableval; do
	if test "X$pkg" = "X$p"; then
	enable_fast_install=yes
	fi
	done
	IFS="$ac_save_ifs"
	;;
	esac],
	enable_fast_install=AC_ENABLE_FAST_INSTALL_DEFAULT)dnl
	])

	# AC_ENABLE_FAST_INSTALL - set the default to --disable-fast-install
	AC_DEFUN(AC_DISABLE_FAST_INSTALL, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
	AC_ENABLE_FAST_INSTALL(no)])

	# AC_PROG_LD - find the path to the GNU or non-GNU linker
	AC_DEFUN(AC_PROG_LD,
	[AC_ARG_WITH(gnu-ld,
	[ --with-gnu-ld assume the C compiler uses GNU ld [default=no]],
	test "$withval" = no \|\| with_gnu_ld=yes, with_gnu_ld=no)
	AC_REQUIRE([AC_PROG_CC])dnl
	AC_REQUIRE([AC_CANONICAL_HOST])dnl
	AC_REQUIRE([AC_CANONICAL_BUILD])dnl
	ac_prog=ld
	if test "$ac_cv_prog_gcc" = yes; then
	# Check if gcc -print-prog-name=ld gives a path.
	AC_MSG_CHECKING([for ld used by GCC])
	ac_prog=`($CC -print-prog-name=ld) 2>&5`
	case "$ac_prog" in
	# Accept absolute paths.
	changequote(,)dnl
	[\\/]* \| [A-Za-z]:[\\/]*)
	re_direlt='/[^/][^/]*/\.\./'
	changequote([,])dnl
	# Canonicalize the path of ld
	ac_prog=`echo $ac_prog\| sed 's%\\\\%/%g'`
	while echo $ac_prog \| grep "$re_direlt" > /dev/null 2>&1; do
	ac_prog=`echo $ac_prog\| sed "s%$re_direlt%/%"`
	done
	test -z "$LD" && LD="$ac_prog"
	;;
	"")
	# If it fails, then pretend we aren't using GCC.
	ac_prog=ld
	;;
	*)
	# If it is relative, then search for the first ld in PATH.
	with_gnu_ld=unknown
	;;
	esac
	elif test "$with_gnu_ld" = yes; then
	AC_MSG_CHECKING([for GNU ld])
	else
	AC_MSG_CHECKING([for non-GNU ld])
	fi
	AC_CACHE_VAL(ac_cv_path_LD,
	[if test -z "$LD"; then
	IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
	for ac_dir in $PATH; do
	test -z "$ac_dir" && ac_dir=.
	if test -f "$ac_dir/$ac_prog" \|\| test -f "$ac_dir/$ac_prog$ac_exeext"; then
	ac_cv_path_LD="$ac_dir/$ac_prog"
	# Check to see if the program is GNU ld. I'd rather use --version,
	# but apparently some GNU ld's only accept -v.
	# Break only if it was the GNU/non-GNU ld that we prefer.
	if "$ac_cv_path_LD" -v 2>&1 < /dev/null \| egrep '(GNU\|with BFD)' > /dev/null; then
	test "$with_gnu_ld" != no && break
	else
	test "$with_gnu_ld" != yes && break
	fi
	fi
	done
	IFS="$ac_save_ifs"
	else
	ac_cv_path_LD="$LD" # Let the user override the test with a path.
	fi])
	LD="$ac_cv_path_LD"
	if test -n "$LD"; then
	AC_MSG_RESULT($LD)
	else
	AC_MSG_RESULT(no)
	fi
	test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
	AC_PROG_LD_GNU
	])

	AC_DEFUN(AC_PROG_LD_GNU,
	[AC_CACHE_CHECK([if the linker ($LD) is GNU ld], ac_cv_prog_gnu_ld,
	[# I'd rather use --version here, but apparently some GNU ld's only accept -v.
	if $LD -v 2>&1 </dev/null \| egrep '(GNU\|with BFD)' 1>&5; then
	ac_cv_prog_gnu_ld=yes
	else
	ac_cv_prog_gnu_ld=no
	fi])
	])

	# AC_PROG_NM - find the path to a BSD-compatible name lister
	AC_DEFUN(AC_PROG_NM,
	[AC_MSG_CHECKING([for BSD-compatible nm])
	AC_CACHE_VAL(ac_cv_path_NM,
	[if test -n "$NM"; then
	# Let the user override the test.
	ac_cv_path_NM="$NM"
	else
	IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
	for ac_dir in $PATH /usr/ccs/bin /usr/ucb /bin; do
	test -z "$ac_dir" && ac_dir=.
	if test -f $ac_dir/nm \|\| test -f $ac_dir/nm$ac_exeext ; then
	# Check to see if the nm accepts a BSD-compat flag.
	# Adding the `sed 1q' prevents false positives on HP-UX, which says:
	# nm: unknown option "B" ignored
	if ($ac_dir/nm -B /dev/null 2>&1 \| sed '1q'; exit 0) \| egrep /dev/null >/dev/null; then
	ac_cv_path_NM="$ac_dir/nm -B"
	break
	elif ($ac_dir/nm -p /dev/null 2>&1 \| sed '1q'; exit 0) \| egrep /dev/null >/dev/null; then
	ac_cv_path_NM="$ac_dir/nm -p"
	break
	else
	ac_cv_path_NM=${ac_cv_path_NM="$ac_dir/nm"} # keep the first match, but
	continue # so that we can try to find one that supports BSD flags
	fi
	fi
	done
	IFS="$ac_save_ifs"
	test -z "$ac_cv_path_NM" && ac_cv_path_NM=nm
	fi])
	NM="$ac_cv_path_NM"
	AC_MSG_RESULT([$NM])
	])

	# AC_CHECK_LIBM - check for math library
	AC_DEFUN(AC_CHECK_LIBM,
	[AC_REQUIRE([AC_CANONICAL_HOST])dnl
	LIBM=
	case "$lt_target" in
	--beos* \| --cygwin*)
	# These system don't have libm
	;;
	-ncr-sysv4.3)
	AC_CHECK_LIB(mw, _mwvalidcheckl, LIBM="-lmw")
	AC_CHECK_LIB(m, main, LIBM="$LIBM -lm")
	;;
	*)
	AC_CHECK_LIB(m, main, LIBM="-lm")
	;;
	esac
	])

	# AC_LIBLTDL_CONVENIENCE[(dir)] - sets LIBLTDL to the link flags for
	# the libltdl convenience library and INCLTDL to the include flags for
	# the libltdl header and adds --enable-ltdl-convenience to the
	# configure arguments. Note that LIBLTDL and INCLTDL are not
	# AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called. If DIR is not
	# provided, it is assumed to be `libltdl'. LIBLTDL will be prefixed
	# with '${top_builddir}/' and INCLTDL will be prefixed with
	# '${top_srcdir}/' (note the single quotes!). If your package is not
	# flat and you're not using automake, define top_builddir and
	# top_srcdir appropriately in the Makefiles.
	AC_DEFUN(AC_LIBLTDL_CONVENIENCE, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
	case "$enable_ltdl_convenience" in
	no) AC_MSG_ERROR([this package needs a convenience libltdl]) ;;
	"") enable_ltdl_convenience=yes
	ac_configure_args="$ac_configure_args --enable-ltdl-convenience" ;;
	esac
	LIBLTDL='${top_builddir}/'ifelse($#,1,[$1],['libltdl'])/libltdlc.la
	INCLTDL='-I${top_srcdir}/'ifelse($#,1,[$1],['libltdl'])
	])

	# AC_LIBLTDL_INSTALLABLE[(dir)] - sets LIBLTDL to the link flags for
	# the libltdl installable library and INCLTDL to the include flags for
	# the libltdl header and adds --enable-ltdl-install to the configure
	# arguments. Note that LIBLTDL and INCLTDL are not AC_SUBSTed, nor is
	# AC_CONFIG_SUBDIRS called. If DIR is not provided and an installed
	# libltdl is not found, it is assumed to be `libltdl'. LIBLTDL will
	# be prefixed with '${top_builddir}/' and INCLTDL will be prefixed
	# with '${top_srcdir}/' (note the single quotes!). If your package is
	# not flat and you're not using automake, define top_builddir and
	# top_srcdir appropriately in the Makefiles.
	# In the future, this macro may have to be called after AC_PROG_LIBTOOL.
	AC_DEFUN(AC_LIBLTDL_INSTALLABLE, [AC_BEFORE([$0],[AC_LIBTOOL_SETUP])dnl
	AC_CHECK_LIB(ltdl, main,
	[test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
	[if test x"$enable_ltdl_install" = xno; then
	AC_MSG_WARN([libltdl not installed, but installation disabled])
	else
	enable_ltdl_install=yes
	fi
	])
	if test x"$enable_ltdl_install" = x"yes"; then
	ac_configure_args="$ac_configure_args --enable-ltdl-install"
	LIBLTDL='${top_builddir}/'ifelse($#,1,[$1],['libltdl'])/libltdl.la
	INCLTDL='-I${top_srcdir}/'ifelse($#,1,[$1],['libltdl'])
	else
	ac_configure_args="$ac_configure_args --enable-ltdl-install=no"
	LIBLTDL="-lltdl"
	INCLTDL=
	fi
	])

	dnl old names
	AC_DEFUN(AM_PROG_LIBTOOL, [indir([AC_PROG_LIBTOOL])])dnl
	AC_DEFUN(AM_ENABLE_SHARED, [indir([AC_ENABLE_SHARED], $@)])dnl
	AC_DEFUN(AM_ENABLE_STATIC, [indir([AC_ENABLE_STATIC], $@)])dnl
	AC_DEFUN(AM_DISABLE_SHARED, [indir([AC_DISABLE_SHARED], $@)])dnl
	AC_DEFUN(AM_DISABLE_STATIC, [indir([AC_DISABLE_STATIC], $@)])dnl
	AC_DEFUN(AM_PROG_LD, [indir([AC_PROG_LD])])dnl
	AC_DEFUN(AM_PROG_NM, [indir([AC_PROG_NM])])dnl

	dnl This is just to silence aclocal about the macro not being used
	ifelse([AC_DISABLE_FAST_INSTALL])dnl