ltdl.m4 - libtool - Git at Google

 ## ltdl.m4 - Configure ltdl for the target system. -*-Shell-script-*-
 ## Copyright (C) 1999-2000 Free Software Foundation, Inc.
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
 ## the Free Software Foundation; either version 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 5 AC_LIB_LTDL

 # AC_WITH_LTDL
 # ------------
 # Clients of libltdl can use this macro to allow the installer to
 # choose between a shipped copy of the ltdl sources or a preinstalled
 # version of the library.
 AC_DEFUN([AC_WITH_LTDL],
 [AC_REQUIRE([AC_LIB_LTDL])
 AC_SUBST([LIBLTDL])
 AC_SUBST([INCLTDL])

 # Unless the user asks us to check, assume no installed ltdl exists.
 use_installed_libltdl=no

 AC_ARG_WITH([included_ltdl],
     [  --with-included-ltdl    use the GNU ltdl sources included here])

 if test "x$with_included_ltdl" != xyes; then
   # We are not being forced to use the included libltdl sources, so
   # decide whether there is a useful installed version we can use.
   AC_CHECK_HEADER([ltdl.h],
       [AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
           [with_included_ltdl=no],
           [with_included_ltdl=yes])
   ])
 fi

 if test "x$enable_ltdl_install" != xyes; then
   # If the user did not specify an installable libltdl, then default
   # to a convenience lib.
   AC_LIBLTDL_CONVENIENCE
 fi

 if test "x$with_included_ltdl" = xno; then
   # If the included ltdl is not to be used. then Use the
   # preinstalled libltdl we found.
   AC_DEFINE([HAVE_LTDL], 1,
     [Define this if a modern libltdl is already installed])
   LIBLTDL=-lltdl
 fi

 # Report our decision...
 AC_MSG_CHECKING([whether to use included libltdl])
 AC_MSG_RESULT([$with_included_ltdl])

 AC_CONFIG_SUBDIRS([libltdl])
 ])# AC_WITH_LTDL


 # AC_LIB_LTDL
 # -----------
 # Perform all the checks necessary for compilation of the ltdl objects
 #  -- including compiler checks and header checks.
 AC_DEFUN([AC_LIB_LTDL],
 [AC_PREREQ(2.13)
 AC_REQUIRE([AC_PROG_CC])
 AC_REQUIRE([AC_C_CONST])
 AC_REQUIRE([AC_HEADER_STDC])
 AC_REQUIRE([AC_HEADER_DIRENT])
 AC_REQUIRE([AC_LIBTOOL_HEADER_ASSERT])
 AC_REQUIRE([_LT_AC_CHECK_DLFCN])
 AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
 AC_REQUIRE([AC_LTDL_SHLIBEXT])
 AC_REQUIRE([AC_LTDL_SHLIBPATH])
 AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
 AC_REQUIRE([AC_LTDL_OBJDIR])
 AC_REQUIRE([AC_LTDL_DLPREOPEN])
 AC_REQUIRE([AC_LTDL_DLLIB])
 AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
 AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
 AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
 AC_REQUIRE([AC_LTDL_FUNC_ARGZ])

 AC_CHECK_HEADERS([errno.h malloc.h memory.h stdlib.h stdio.h ctype.h unistd.h])
 AC_CHECK_HEADERS([dl.h sys/dl.h dld.h])
 AC_CHECK_HEADERS([string.h strings.h], break)

 AC_CHECK_FUNCS([strchr index], break)
 AC_CHECK_FUNCS([strrchr rindex], break)
 AC_CHECK_FUNCS([memcpy bcopy], break)
 AC_CHECK_FUNCS([memmove strcmp])

 ])# AC_LIB_LTDL

 # AC_LTDL_ENABLE_INSTALL
 # ----------------------
 AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
 [AC_ARG_ENABLE(ltdl-install,
 [  --enable-ltdl-install   install libltdl])

 AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
 AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
 ])])# AC_LTDL_ENABLE_INSTALL

 # AC_LTDL_SYS_DLOPEN_DEPLIBS
 # --------------------------
 AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
 [AC_REQUIRE([AC_CANONICAL_HOST])
 AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
 	libltdl_cv_sys_dlopen_deplibs, [dnl
 	# PORTME does your system automatically load deplibs for dlopen()?
 	libltdl_cv_sys_dlopen_deplibs=unknown
 	case "$host_os" in
         hpux10*|hpux11*)
           libltdl_cv_sys_dlopen_deplibs=yes
           ;;
 	linux*)
 	  libltdl_cv_sys_dlopen_deplibs=yes
 	  ;;
 	netbsd*)
 	  libltdl_cv_sys_dlopen_deplibs=yes
 	  ;;
 	openbsd*)
 	  libltdl_cv_sys_dlopen_deplibs=yes
 	  ;;
 	solaris*)
 	  libltdl_cv_sys_dlopen_deplibs=yes
 	  ;;
 	esac
 ])
 if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
  AC_DEFINE(LTDL_DLOPEN_DEPLIBS, 1,
     [Define if the OS needs help to load dependent libraries for dlopen(). ])
 fi
 ])# AC_LTDL_SYS_DLOPEN_DEPLIBS

 # AC_LTDL_SHLIBEXT
 # ----------------
 AC_DEFUN([AC_LTDL_SHLIBEXT],
 [AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
 AC_CACHE_CHECK([which extension is used for shared libraries],
   libltdl_cv_shlibext,
 [ac_last=
   for ac_spec in $library_names_spec; do
     ac_last="$ac_spec"
   done
   echo "$ac_last" | [sed 's/\[.*\]//;s/^[^.]*//;s/\$.*$//;s/\.$//'] > conftest
 libltdl_cv_shlibext=`cat conftest`
 rm -f conftest
 ])
 if test -n "$libltdl_cv_shlibext"; then
   AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
     [Define to the extension used for shared libraries, say, ".so". ])
 fi
 ])# AC_LTDL_SHLIBEXT

 # AC_LTDL_SHLIBPATH
 # -----------------
 AC_DEFUN([AC_LTDL_SHLIBPATH],
 [AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
 AC_CACHE_CHECK([which variable specifies run-time library path],
   libltdl_cv_shlibpath_var, [libltdl_cv_shlibpath_var="$shlibpath_var"])
 if test -n "$libltdl_cv_shlibpath_var"; then
   AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
     [Define to the name of the environment variable that determines the dynamic library search path. ])
 fi
 ])# AC_LTDL_SHLIBPATH

 # AC_LTDL_SYSSEARCHPATH
 # ---------------------
 AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
 [AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
 AC_CACHE_CHECK([for the default library search path],
   libltdl_cv_sys_search_path, [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
 if test -n "$libltdl_cv_sys_search_path"; then
   case "$host" in
   *-*-mingw*) pathsep=";" ;;
   *) pathsep=":" ;;
   esac
   sys_search_path=
   for dir in $libltdl_cv_sys_search_path; do
     if test -z "$sys_search_path"; then
       sys_search_path="$dir"
     else
       sys_search_path="$sys_search_path$pathsep$dir"
     fi
   done
   AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
     [Define to the system default library search path. ])
 fi
 ])# AC_LTDL_SYSSEARCHPATH

 # AC_LTDL_OBJDIR
 # --------------
 AC_DEFUN([AC_LTDL_OBJDIR],
 [AC_CACHE_CHECK([for objdir],
   libltdl_cv_objdir, [libltdl_cv_objdir="$objdir"
 if test -n "$objdir"; then
   :
 else
   rm -f .libs 2>/dev/null
   mkdir .libs 2>/dev/null
   if test -d .libs; then
     libltdl_cv_objdir=.libs
   else
     # MS-DOS does not allow filenames that begin with a dot.
     libltdl_cv_objdir=_libs
   fi
 rmdir .libs 2>/dev/null
 fi])
 AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
   [Define to the sub-directory in which libtool stores uninstalled libraries. ])
 ])# AC_LTDL_OBJDIR

 # AC_LTDL_DLPREOPEN
 # -----------------
 AC_DEFUN([AC_LTDL_DLPREOPEN],
 [AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])dnl
 AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
        libltdl_cv_preloaded_symbols, [dnl
   if test -n "$global_symbol_pipe"; then
     libltdl_cv_preloaded_symbols=yes
   else
     libltdl_cv_preloaded_symbols=no
   fi
 ])
 if test x"$libltdl_cv_preloaded_symbols" = x"yes"; then
   AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
     [Define if libtool can extract symbol lists from object files. ])
 fi
 ])# AC_LTDL_DLPREOPEN

 # AC_LTDL_DLLIB
 # -------------
 AC_DEFUN([AC_LTDL_DLLIB],
 [LIBADD_DL=
 AC_SUBST(LIBADD_DL)

 AC_CHECK_FUNC([shl_load],
       [AC_DEFINE([HAVE_SHL_LOAD], [1],
 		 [Define if you have the shl_load function.])],
   [AC_CHECK_LIB([dld], [shl_load],
 	[AC_DEFINE([HAVE_SHL_LOAD], [1],
 		   [Define if you have the shl_load function.])
 	LIBADD_DL="$LIBADD_DL -ldld"],
     [AC_CHECK_LIB([dl], [dlopen],
 	  [AC_DEFINE([HAVE_LIBDL], [1],
 		     [Define if you have the libdl library or equivalent.])
 	  LIBADD_DL="-ldl"],
       [AC_TRY_LINK([#if HAVE_DLFCN_H
 #  include <dlfcn.h>
 #endif
       ],
 	[dlopen(0, 0);],
 	    [AC_DEFINE([HAVE_LIBDL], [1],
 		       [Define if you have the libdl library or equivalent.])],
 	[AC_CHECK_LIB([svld], [dlopen],
 	      [AC_DEFINE([HAVE_LIBDL], [1],
 			 [Define if you have the libdl library or equivalent.])
 	      LIBADD_DL="-lsvld"],
 	  [AC_CHECK_LIB([dld], [dld_link],
 	        [AC_DEFINE([HAVE_DLD], [1],
 			   [Define if you have the GNU dld library.])
 	 	LIBADD_DL="$LIBADD_DL -ldld"
           ])
         ])
       ])
     ])
   ])
 ])

 if test "x$ac_cv_func_dlopen" = xyes || test "x$ac_cv_lib_dl_dlopen" = xyes; then
  LIBS_SAVE="$LIBS"
  LIBS="$LIBS $LIBADD_DL"
  AC_CHECK_FUNCS(dlerror)
  LIBS="$LIBS_SAVE"
 fi
 ])# AC_LTDL_DLLIB

 # AC_LTDL_SYMBOL_USCORE
 # ---------------------
 AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
 [dnl does the compiler prefix global symbols with an underscore?
 AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])dnl
 AC_MSG_CHECKING([for _ prefix in compiled symbols])
 AC_CACHE_VAL(ac_cv_sys_symbol_underscore,
 [ac_cv_sys_symbol_underscore=no
 cat > conftest.$ac_ext <<EOF
 void nm_test_func(){}
 int main(){nm_test_func;return 0;}
 EOF
 if AC_TRY_EVAL(ac_compile); then
   # Now try to grab the symbols.
   ac_nlist=conftest.nm
   if AC_TRY_EVAL(NM conftest.$ac_objext \| $global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
     # See whether the symbols have a leading underscore.
     if egrep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
       ac_cv_sys_symbol_underscore=yes
     else
       if egrep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
 	:
       else
 	echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
       fi
     fi
   else
     echo "configure: cannot run $global_symbol_pipe" >&AC_FD_CC
   fi
 else
   echo "configure: failed program was:" >&AC_FD_CC
   cat conftest.c >&AC_FD_CC
 fi
 rm -rf conftest*
 ])
 AC_MSG_RESULT($ac_cv_sys_symbol_underscore)
 ])# AC_LTDL_SYMBOL_USCORE


 # AC_LTDL_DLSYM_USCORE
 # --------------------
 AC_DEFUN([AC_LTDL_DLSYM_USCORE],
 [AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])dnl
 if test x"$ac_cv_sys_symbol_underscore" = xyes; then
   if test x"$ac_cv_func_dlopen" = xyes ||
      test x"$ac_cv_lib_dl_dlopen" = xyes ; then
 	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
 		libltdl_cv_need_uscore, [dnl
 		libltdl_cv_need_uscore=unknown
                 save_LIBS="$LIBS"
                 LIBS="$LIBS $LIBADD_DL"
 		_LT_AC_TRY_DLOPEN_SELF(
 		  libltdl_cv_need_uscore=no, libltdl_cv_need_uscore=yes,
 		  [],			     libltdl_cv_need_uscore=cross)
 		LIBS="$save_LIBS"
 	])
   fi
 fi

 if test x"$libltdl_cv_need_uscore" = xyes; then
   AC_DEFINE(NEED_USCORE, 1,
     [Define if dlsym() requires a leading underscore in symbol names. ])
 fi
 ])# AC_LTDL_DLSYM_USCORE


 # AC_CHECK_TYPES(TYPES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
 #                [INCLUDES])
 # ---------------------------------------------------------------
 # This macro did not exist in Autoconf 2.13, which we do still support
 ifdef([AC_CHECK_TYPES], [],
 [define([AC_CHECK_TYPES],
   [AC_CACHE_CHECK([for $1], ac_Type,
     [AC_TRY_LINK([$4],
 	[if (($1 *) 0)
 	  return 0;
 	if (sizeof ($1))
 	  return 0;],
 	[ac_Type=yes],
 	[ac_Type=no])])
   if test "x$ac_Type" = xyes; then
     ifelse([$2], [], [:], [$2])
   else
     ifelse([$3], [], [:], [$3])
   fi])
 ])# AC_CHECK_TYPES


 # AC_LTDL_FUNC_ARGZ
 # -----------------
 AC_DEFUN([AC_LTDL_FUNC_ARGZ],
 [AC_CHECK_HEADERS([argz.h])

 AC_CHECK_TYPES([error_t],
   [],
   [AC_DEFINE([error_t], [int],
     [Define to a type to use for \`error_t' if it is not otherwise available.])],
   [#if HAVE_ARGZ_H
 #  include <argz.h>
 #endif])

 AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
 ])# AC_LTDL_FUNC_ARGZ
	## ltdl.m4 - Configure ltdl for the target system. --Shell-script--
	## Copyright (C) 1999-2000 Free Software Foundation, Inc.
	##
	## This program is free software; you can redistribute it and/or modify
	## it under the terms of the GNU General Public License as published by
	## the Free Software Foundation; either version 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 5 AC_LIB_LTDL

	# AC_WITH_LTDL
	# ------------
	# Clients of libltdl can use this macro to allow the installer to
	# choose between a shipped copy of the ltdl sources or a preinstalled
	# version of the library.
	AC_DEFUN([AC_WITH_LTDL],
	[AC_REQUIRE([AC_LIB_LTDL])
	AC_SUBST([LIBLTDL])
	AC_SUBST([INCLTDL])

	# Unless the user asks us to check, assume no installed ltdl exists.
	use_installed_libltdl=no

	AC_ARG_WITH([included_ltdl],
	[ --with-included-ltdl use the GNU ltdl sources included here])

	if test "x$with_included_ltdl" != xyes; then
	# We are not being forced to use the included libltdl sources, so
	# decide whether there is a useful installed version we can use.
	AC_CHECK_HEADER([ltdl.h],
	[AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
	[with_included_ltdl=no],
	[with_included_ltdl=yes])
	])
	fi

	if test "x$enable_ltdl_install" != xyes; then
	# If the user did not specify an installable libltdl, then default
	# to a convenience lib.
	AC_LIBLTDL_CONVENIENCE
	fi

	if test "x$with_included_ltdl" = xno; then
	# If the included ltdl is not to be used. then Use the
	# preinstalled libltdl we found.
	AC_DEFINE([HAVE_LTDL], 1,
	[Define this if a modern libltdl is already installed])
	LIBLTDL=-lltdl
	fi

	# Report our decision...
	AC_MSG_CHECKING([whether to use included libltdl])
	AC_MSG_RESULT([$with_included_ltdl])

	AC_CONFIG_SUBDIRS([libltdl])
	])# AC_WITH_LTDL


	# AC_LIB_LTDL
	# -----------
	# Perform all the checks necessary for compilation of the ltdl objects
	# -- including compiler checks and header checks.
	AC_DEFUN([AC_LIB_LTDL],
	[AC_PREREQ(2.13)
	AC_REQUIRE([AC_PROG_CC])
	AC_REQUIRE([AC_C_CONST])
	AC_REQUIRE([AC_HEADER_STDC])
	AC_REQUIRE([AC_HEADER_DIRENT])
	AC_REQUIRE([AC_LIBTOOL_HEADER_ASSERT])
	AC_REQUIRE([_LT_AC_CHECK_DLFCN])
	AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
	AC_REQUIRE([AC_LTDL_SHLIBEXT])
	AC_REQUIRE([AC_LTDL_SHLIBPATH])
	AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
	AC_REQUIRE([AC_LTDL_OBJDIR])
	AC_REQUIRE([AC_LTDL_DLPREOPEN])
	AC_REQUIRE([AC_LTDL_DLLIB])
	AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
	AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
	AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
	AC_REQUIRE([AC_LTDL_FUNC_ARGZ])

	AC_CHECK_HEADERS([errno.h malloc.h memory.h stdlib.h stdio.h ctype.h unistd.h])
	AC_CHECK_HEADERS([dl.h sys/dl.h dld.h])
	AC_CHECK_HEADERS([string.h strings.h], break)

	AC_CHECK_FUNCS([strchr index], break)
	AC_CHECK_FUNCS([strrchr rindex], break)
	AC_CHECK_FUNCS([memcpy bcopy], break)
	AC_CHECK_FUNCS([memmove strcmp])

	])# AC_LIB_LTDL

	# AC_LTDL_ENABLE_INSTALL
	# ----------------------
	AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
	[AC_ARG_ENABLE(ltdl-install,
	[ --enable-ltdl-install install libltdl])

	AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
	AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
	])])# AC_LTDL_ENABLE_INSTALL

	# AC_LTDL_SYS_DLOPEN_DEPLIBS
	# --------------------------
	AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
	[AC_REQUIRE([AC_CANONICAL_HOST])
	AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
	libltdl_cv_sys_dlopen_deplibs, [dnl
	# PORTME does your system automatically load deplibs for dlopen()?
	libltdl_cv_sys_dlopen_deplibs=unknown
	case "$host_os" in
	hpux10\|hpux11)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	linux*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	netbsd*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	openbsd*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	solaris*)
	libltdl_cv_sys_dlopen_deplibs=yes
	;;
	esac
	])
	if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
	AC_DEFINE(LTDL_DLOPEN_DEPLIBS, 1,
	[Define if the OS needs help to load dependent libraries for dlopen(). ])
	fi
	])# AC_LTDL_SYS_DLOPEN_DEPLIBS

	# AC_LTDL_SHLIBEXT
	# ----------------
	AC_DEFUN([AC_LTDL_SHLIBEXT],
	[AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
	AC_CACHE_CHECK([which extension is used for shared libraries],
	libltdl_cv_shlibext,
	[ac_last=
	for ac_spec in $library_names_spec; do
	ac_last="$ac_spec"
	done
	echo "$ac_last" \| [sed 's/\[.\]//;s/^[^.]//;s/\$.*$//;s/\.$//'] > conftest
	libltdl_cv_shlibext=`cat conftest`
	rm -f conftest
	])
	if test -n "$libltdl_cv_shlibext"; then
	AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
	[Define to the extension used for shared libraries, say, ".so". ])
	fi
	])# AC_LTDL_SHLIBEXT

	# AC_LTDL_SHLIBPATH
	# -----------------
	AC_DEFUN([AC_LTDL_SHLIBPATH],
	[AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
	AC_CACHE_CHECK([which variable specifies run-time library path],
	libltdl_cv_shlibpath_var, [libltdl_cv_shlibpath_var="$shlibpath_var"])
	if test -n "$libltdl_cv_shlibpath_var"; then
	AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
	[Define to the name of the environment variable that determines the dynamic library search path. ])
	fi
	])# AC_LTDL_SHLIBPATH

	# AC_LTDL_SYSSEARCHPATH
	# ---------------------
	AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
	[AC_REQUIRE([_LT_AC_LTCONFIG_HACK])
	AC_CACHE_CHECK([for the default library search path],
	libltdl_cv_sys_search_path, [libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
	if test -n "$libltdl_cv_sys_search_path"; then
	case "$host" in
	--mingw*) pathsep=";" ;;
	*) pathsep=":" ;;
	esac
	sys_search_path=
	for dir in $libltdl_cv_sys_search_path; do
	if test -z "$sys_search_path"; then
	sys_search_path="$dir"
	else
	sys_search_path="$sys_search_path$pathsep$dir"
	fi
	done
	AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
	[Define to the system default library search path. ])
	fi
	])# AC_LTDL_SYSSEARCHPATH

	# AC_LTDL_OBJDIR
	# --------------
	AC_DEFUN([AC_LTDL_OBJDIR],
	[AC_CACHE_CHECK([for objdir],
	libltdl_cv_objdir, [libltdl_cv_objdir="$objdir"
	if test -n "$objdir"; then
	:
	else
	rm -f .libs 2>/dev/null
	mkdir .libs 2>/dev/null
	if test -d .libs; then
	libltdl_cv_objdir=.libs
	else
	# MS-DOS does not allow filenames that begin with a dot.
	libltdl_cv_objdir=_libs
	fi
	rmdir .libs 2>/dev/null
	fi])
	AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
	[Define to the sub-directory in which libtool stores uninstalled libraries. ])
	])# AC_LTDL_OBJDIR

	# AC_LTDL_DLPREOPEN
	# -----------------
	AC_DEFUN([AC_LTDL_DLPREOPEN],
	[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])dnl
	AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
	libltdl_cv_preloaded_symbols, [dnl
	if test -n "$global_symbol_pipe"; then
	libltdl_cv_preloaded_symbols=yes
	else
	libltdl_cv_preloaded_symbols=no
	fi
	])
	if test x"$libltdl_cv_preloaded_symbols" = x"yes"; then
	AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
	[Define if libtool can extract symbol lists from object files. ])
	fi
	])# AC_LTDL_DLPREOPEN

	# AC_LTDL_DLLIB
	# -------------
	AC_DEFUN([AC_LTDL_DLLIB],
	[LIBADD_DL=
	AC_SUBST(LIBADD_DL)

	AC_CHECK_FUNC([shl_load],
	[AC_DEFINE([HAVE_SHL_LOAD], [1],
	[Define if you have the shl_load function.])],
	[AC_CHECK_LIB([dld], [shl_load],
	[AC_DEFINE([HAVE_SHL_LOAD], [1],
	[Define if you have the shl_load function.])
	LIBADD_DL="$LIBADD_DL -ldld"],
	[AC_CHECK_LIB([dl], [dlopen],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])
	LIBADD_DL="-ldl"],
	[AC_TRY_LINK([#if HAVE_DLFCN_H
	# include <dlfcn.h>
	#endif
	],
	[dlopen(0, 0);],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])],
	[AC_CHECK_LIB([svld], [dlopen],
	[AC_DEFINE([HAVE_LIBDL], [1],
	[Define if you have the libdl library or equivalent.])
	LIBADD_DL="-lsvld"],
	[AC_CHECK_LIB([dld], [dld_link],
	[AC_DEFINE([HAVE_DLD], [1],
	[Define if you have the GNU dld library.])
	LIBADD_DL="$LIBADD_DL -ldld"
	])
	])
	])
	])
	])
	])

	if test "x$ac_cv_func_dlopen" = xyes \|\| test "x$ac_cv_lib_dl_dlopen" = xyes; then
	LIBS_SAVE="$LIBS"
	LIBS="$LIBS $LIBADD_DL"
	AC_CHECK_FUNCS(dlerror)
	LIBS="$LIBS_SAVE"
	fi
	])# AC_LTDL_DLLIB

	# AC_LTDL_SYMBOL_USCORE
	# ---------------------
	AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
	[dnl does the compiler prefix global symbols with an underscore?
	AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])dnl
	AC_MSG_CHECKING([for _ prefix in compiled symbols])
	AC_CACHE_VAL(ac_cv_sys_symbol_underscore,
	[ac_cv_sys_symbol_underscore=no
	cat > conftest.$ac_ext <<EOF
	void nm_test_func(){}
	int main(){nm_test_func;return 0;}
	EOF
	if AC_TRY_EVAL(ac_compile); then
	# Now try to grab the symbols.
	ac_nlist=conftest.nm
	if AC_TRY_EVAL(NM conftest.$ac_objext \\| $global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
	# See whether the symbols have a leading underscore.
	if egrep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
	ac_cv_sys_symbol_underscore=yes
	else
	if egrep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
	:
	else
	echo "configure: cannot find nm_test_func in $ac_nlist" >&AC_FD_CC
	fi
	fi
	else
	echo "configure: cannot run $global_symbol_pipe" >&AC_FD_CC
	fi
	else
	echo "configure: failed program was:" >&AC_FD_CC
	cat conftest.c >&AC_FD_CC
	fi
	rm -rf conftest*
	])
	AC_MSG_RESULT($ac_cv_sys_symbol_underscore)
	])# AC_LTDL_SYMBOL_USCORE


	# AC_LTDL_DLSYM_USCORE
	# --------------------
	AC_DEFUN([AC_LTDL_DLSYM_USCORE],
	[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])dnl
	if test x"$ac_cv_sys_symbol_underscore" = xyes; then
	if test x"$ac_cv_func_dlopen" = xyes \|\|
	test x"$ac_cv_lib_dl_dlopen" = xyes ; then
	AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
	libltdl_cv_need_uscore, [dnl
	libltdl_cv_need_uscore=unknown
	save_LIBS="$LIBS"
	LIBS="$LIBS $LIBADD_DL"
	_LT_AC_TRY_DLOPEN_SELF(
	libltdl_cv_need_uscore=no, libltdl_cv_need_uscore=yes,
	[], libltdl_cv_need_uscore=cross)
	LIBS="$save_LIBS"
	])
	fi
	fi

	if test x"$libltdl_cv_need_uscore" = xyes; then
	AC_DEFINE(NEED_USCORE, 1,
	[Define if dlsym() requires a leading underscore in symbol names. ])
	fi
	])# AC_LTDL_DLSYM_USCORE


	# AC_CHECK_TYPES(TYPES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
	# [INCLUDES])
	# ---------------------------------------------------------------
	# This macro did not exist in Autoconf 2.13, which we do still support
	ifdef([AC_CHECK_TYPES], [],
	[define([AC_CHECK_TYPES],
	[AC_CACHE_CHECK([for $1], ac_Type,
	[AC_TRY_LINK([$4],
	[if (($1 *) 0)
	return 0;
	if (sizeof ($1))
	return 0;],
	[ac_Type=yes],
	[ac_Type=no])])
	if test "x$ac_Type" = xyes; then
	ifelse([$2], [], [:], [$2])
	else
	ifelse([$3], [], [:], [$3])
	fi])
	])# AC_CHECK_TYPES


	# AC_LTDL_FUNC_ARGZ
	# -----------------
	AC_DEFUN([AC_LTDL_FUNC_ARGZ],
	[AC_CHECK_HEADERS([argz.h])

	AC_CHECK_TYPES([error_t],
	[],
	[AC_DEFINE([error_t], [int],
	[Define to a type to use for \`error_t' if it is not otherwise available.])],
	[#if HAVE_ARGZ_H
	# include <argz.h>
	#endif])

	AC_CHECK_FUNCS([argz_append argz_create_sep argz_insert argz_next argz_stringify])
	])# AC_LTDL_FUNC_ARGZ