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## ltdl.m4 - Configure ltdl for the target system. -*-Autoconf-*-
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## Copyright (C) 1999-2004 Free Software Foundation, Inc.
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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## This program is distributed in the hope that it will be useful, but
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## WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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## General Public License for more details.
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, write to the Free Software
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## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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## As a special exception to the GNU General Public License, if you
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## distribute this file as part of a program that contains a
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## configuration script generated by Autoconf, you may include it under
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## the same distribution terms that you use for the rest of that program.
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# serial 6 AC_LIB_LTDL
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# AC_WITH_LTDL([DIRECTORY])
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# -------------------------
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# Clients of libltdl can use this macro to allow the installer to
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# choose between a shipped copy of the ltdl sources or a preinstalled
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# version of the library.
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AC_DEFUN([AC_WITH_LTDL],
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[AC_ARG_WITH([included_ltdl],
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[AC_HELP_STRING([--with-included-ltdl],
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[use the GNU ltdl sources included here])])
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if test "x$with_included_ltdl" != xyes; then
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# We are not being forced to use the included libltdl sources, so
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# decide whether there is a useful installed version we can use.
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AC_CHECK_HEADER([ltdl.h],
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[AC_CHECK_LIB([ltdl], [lt_dlcaller_register],
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[with_included_ltdl=no],
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[with_included_ltdl=yes])],
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if test "x$enable_ltdl_install" != xyes; then
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# If the user did not specify an installable libltdl, then default
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# to a convenience lib.
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AC_LIBLTDL_CONVENIENCE
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if test "x$with_included_ltdl" = xno; then
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# If the included ltdl is not to be used. then Use the
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# preinstalled libltdl we found.
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AC_DEFINE([HAVE_LTDL], 1,
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[Define this if a modern libltdl is already installed])
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# Report our decision...
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AC_MSG_CHECKING([whether to use included libltdl])
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AC_MSG_RESULT([$with_included_ltdl])
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AC_CONFIG_SUBDIRS(m4_if($#, 1, [$1], [libltdl]))
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# AC_LIBLTDL_CONVENIENCE([DIRECTORY])
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# -----------------------------------
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# sets LIBLTDL to the link flags for the libltdl convenience library and
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# LTDLINCL to the include flags for the libltdl header and adds
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# --enable-ltdl-convenience to the configure arguments. Note that LIBLTDL
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# and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called. If
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# DIRECTORY is not provided, it is assumed to be `libltdl'. LIBLTDL will
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# be prefixed with '${top_builddir}/' and LTDLINCL will be prefixed with
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# '${top_srcdir}/' (note the single quotes!). If your package is not
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# flat and you're not using automake, define top_builddir and
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# top_srcdir appropriately in the Makefiles.
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AC_DEFUN([AC_LIBLTDL_CONVENIENCE],
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[case $enable_ltdl_convenience in
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no) AC_MSG_ERROR([this package needs a convenience libltdl]) ;;
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"") enable_ltdl_convenience=yes
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ac_configure_args="$ac_configure_args --enable-ltdl-convenience" ;;
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LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdlc.la
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LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])
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# For backwards non-gettext consistent compatibility...
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])# AC_LIBLTDL_CONVENIENCE
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# AC_LIBLTDL_INSTALLABLE([DIRECTORY])
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# -----------------------------------
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# sets LIBLTDL to the link flags for the libltdl installable library and
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# LTDLINCL to the include flags for the libltdl header and adds
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# --enable-ltdl-install to the configure arguments. Note that LIBLTDL
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# and LTDLINCL are not AC_SUBSTed, nor is AC_CONFIG_SUBDIRS called. If
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# DIRECTORY is not provided and an installed libltdl is not found, it is
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# assumed to be `libltdl'. LIBLTDL will be prefixed with '${top_builddir}/'
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# and LTDLINCL will be prefixed with '${top_srcdir}/' (note the single
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# quotes!). If your package is not flat and you're not using automake,
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# define top_builddir and top_srcdir appropriately in the Makefiles.
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# In the future, this macro may have to be called after LT_INIT.
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AC_DEFUN([AC_LIBLTDL_INSTALLABLE],
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[AC_CHECK_LIB(ltdl, lt_dlinit,
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[test x"$enable_ltdl_install" != xyes && enable_ltdl_install=no],
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[if test x"$enable_ltdl_install" = xno; then
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AC_MSG_WARN([libltdl not installed, but installation disabled])
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enable_ltdl_install=yes
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if test x"$enable_ltdl_install" = x"yes"; then
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ac_configure_args="$ac_configure_args --enable-ltdl-install"
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LIBLTDL='${top_builddir}/'m4_if($#, 1, [$1], ['libltdl'])/libltdl.la
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LTDLINCL='-I${top_srcdir}/'m4_if($#, 1, [$1], ['libltdl'])
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ac_configure_args="$ac_configure_args --enable-ltdl-install=no"
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# For backwards non-gettext consistent compatibility...
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])# AC_LIBLTDL_INSTALLABLE
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# Perform all the checks necessary for compilation of the ltdl objects
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# -- including compiler checks and header checks.
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AC_DEFUN([AC_LIB_LTDL],
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[AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([AC_C_CONST])
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AC_REQUIRE([AC_HEADER_STDC])
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AC_REQUIRE([AC_HEADER_DIRENT])
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AC_REQUIRE([_LT_AC_CHECK_DLFCN])
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AC_REQUIRE([AC_LTDL_ENABLE_INSTALL])
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AC_REQUIRE([AC_LTDL_SHLIBEXT])
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AC_REQUIRE([AC_LTDL_SHLIBPATH])
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AC_REQUIRE([AC_LTDL_SYSSEARCHPATH])
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AC_REQUIRE([AC_LTDL_OBJDIR])
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AC_REQUIRE([AC_LTDL_DLPREOPEN])
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AC_REQUIRE([AC_LTDL_DLLIB])
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AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
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AC_REQUIRE([AC_LTDL_DLSYM_USCORE])
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AC_REQUIRE([AC_LTDL_SYS_DLOPEN_DEPLIBS])
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AC_REQUIRE([gl_FUNC_ARGZ])
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# In order that ltdl.c can compile, run AC_CONFIG_HEADERS for the user
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# if they did not call it themself. This is so that ltdl.h can pick up
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# the parent projects config.h file, The first file in AC_CONFIG_HEADERS
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# must contain the definitions required by ltdl.c.
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m4_ifset([AC_LIST_HEADERS],
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[CONFIG_H=`echo "AC_LIST_HEADERS" | $SED 's,^[[ ]]*,,;s,[[ :]].*$,,'`],
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[CONFIG_H=config.h;AC_CONFIG_HEADERS([config.h])])
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AC_CHECK_HEADERS([memory.h unistd.h dl.h sys/dl.h dld.h mach-o/dyld.h],
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[], [], [AC_INCLUDES_DEFAULT])
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AC_CHECK_HEADERS([string.h strings.h], [break], [], [AC_INCLUDES_DEFAULT])
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AC_CHECK_FUNCS([closedir opendir readdir], [], [AC_LIBOBJ([lt__dirent])])
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# AC_LTDL_ENABLE_INSTALL
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# ----------------------
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AC_DEFUN([AC_LTDL_ENABLE_INSTALL],
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[AC_ARG_ENABLE([ltdl-install],
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[AC_HELP_STRING([--enable-ltdl-install], [install libltdl])])
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AM_CONDITIONAL(INSTALL_LTDL, test x"${enable_ltdl_install-no}" != xno)
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AM_CONDITIONAL(CONVENIENCE_LTDL, test x"${enable_ltdl_convenience-no}" != xno)
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])])# AC_LTDL_ENABLE_INSTALL
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# AC_LTDL_SYS_DLOPEN_DEPLIBS
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# --------------------------
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AC_DEFUN([AC_LTDL_SYS_DLOPEN_DEPLIBS],
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[AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CACHE_CHECK([whether deplibs are loaded by dlopen],
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[libltdl_cv_sys_dlopen_deplibs],
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[# PORTME does your system automatically load deplibs for dlopen?
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# or its logical equivalent (e.g. shl_load for HP-UX < 11)
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# For now, we just catch OSes we know something about -- in the
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# future, we'll try test this programmatically.
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libltdl_cv_sys_dlopen_deplibs=unknown
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aix3*|aix4.1.*|aix4.2.*)
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# Unknown whether this is true for these versions of AIX, but
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# we want this `case' here to explicitly catch those versions.
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libltdl_cv_sys_dlopen_deplibs=unknown
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libltdl_cv_sys_dlopen_deplibs=yes
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# Assuming the user has installed a libdl from somewhere, this is true
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# If you are looking for one http://www.opendarwin.org/projects/dlcompat
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libltdl_cv_sys_dlopen_deplibs=yes
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gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
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# GNU and its variants, using gnu ld.so (Glibc)
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libltdl_cv_sys_dlopen_deplibs=yes
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libltdl_cv_sys_dlopen_deplibs=yes
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irix[[12345]]*|irix6.[[01]]*)
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# Catch all versions of IRIX before 6.2, and indicate that we don't
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# know how it worked for any of those versions.
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libltdl_cv_sys_dlopen_deplibs=unknown
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# The case above catches anything before 6.2, and it's known that
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# at 6.2 and later dlopen does load deplibs.
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libltdl_cv_sys_dlopen_deplibs=yes
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libltdl_cv_sys_dlopen_deplibs=yes
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libltdl_cv_sys_dlopen_deplibs=yes
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# dlopen did load deplibs (at least at 4.x), but until the 5.x series,
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# it did *not* use an RPATH in a shared library to find objects the
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# library depends on, so we explictly say `no'.
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libltdl_cv_sys_dlopen_deplibs=no
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osf5.0|osf5.0a|osf5.1)
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# dlopen *does* load deplibs and with the right loader patch applied
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# it even uses RPATH in a shared library to search for shared objects
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# that the library depends on, but there's no easy way to know if that
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# patch is installed. Since this is the case, all we can really
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# say is unknown -- it depends on the patch being installed. If
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# it is, this changes to `yes'. Without it, it would be `no'.
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libltdl_cv_sys_dlopen_deplibs=unknown
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# the two cases above should catch all versions of osf <= 5.1. Read
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# the comments above for what we know about them.
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# At > 5.1, deplibs are loaded *and* any RPATH in a shared library
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# is used to find them so we can finally say `yes'.
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libltdl_cv_sys_dlopen_deplibs=yes
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libltdl_cv_sys_dlopen_deplibs=yes
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libltdl_cv_sys_dlopen_deplibs=yes
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if test "$libltdl_cv_sys_dlopen_deplibs" != yes; then
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AC_DEFINE([LTDL_DLOPEN_DEPLIBS], [1],
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[Define if the OS needs help to load dependent libraries for dlopen().])
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])# AC_LTDL_SYS_DLOPEN_DEPLIBS
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AC_DEFUN([AC_LTDL_SHLIBEXT],
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[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
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AC_CACHE_CHECK([which extension is used for loadable modules],
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[libltdl_cv_shlibext],
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eval libltdl_cv_shlibext=$shrext_cmds
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if test -n "$libltdl_cv_shlibext"; then
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AC_DEFINE_UNQUOTED(LTDL_SHLIB_EXT, "$libltdl_cv_shlibext",
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[Define to the extension used for shared libraries, say, ".so".])
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AC_DEFUN([AC_LTDL_SHLIBPATH],
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[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
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AC_CACHE_CHECK([which variable specifies run-time library path],
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[libltdl_cv_shlibpath_var], [libltdl_cv_shlibpath_var="$shlibpath_var"])
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if test -n "$libltdl_cv_shlibpath_var"; then
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AC_DEFINE_UNQUOTED(LTDL_SHLIBPATH_VAR, "$libltdl_cv_shlibpath_var",
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[Define to the name of the environment variable that determines the dynamic library search path.])
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])# AC_LTDL_SHLIBPATH
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# AC_LTDL_SYSSEARCHPATH
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# ---------------------
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AC_DEFUN([AC_LTDL_SYSSEARCHPATH],
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[AC_REQUIRE([AC_LIBTOOL_SYS_DYNAMIC_LINKER])
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AC_CACHE_CHECK([for the default library search path],
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[libltdl_cv_sys_search_path],
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[libltdl_cv_sys_search_path="$sys_lib_dlsearch_path_spec"])
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if test -n "$libltdl_cv_sys_search_path"; then
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for dir in $libltdl_cv_sys_search_path; do
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if test -z "$sys_search_path"; then
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sys_search_path="$dir"
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sys_search_path="$sys_search_path$PATH_SEPARATOR$dir"
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AC_DEFINE_UNQUOTED(LTDL_SYSSEARCHPATH, "$sys_search_path",
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[Define to the system default library search path.])
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])# AC_LTDL_SYSSEARCHPATH
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AC_DEFUN([AC_LTDL_OBJDIR],
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[AC_CACHE_CHECK([for objdir],
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[libltdl_cv_objdir="$objdir"
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if test -n "$objdir"; then
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rm -f .libs 2>/dev/null
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mkdir .libs 2>/dev/null
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if test -d .libs; then
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libltdl_cv_objdir=.libs
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# MS-DOS does not allow filenames that begin with a dot.
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libltdl_cv_objdir=_libs
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rmdir .libs 2>/dev/null
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AC_DEFINE_UNQUOTED(LTDL_OBJDIR, "$libltdl_cv_objdir/",
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[Define to the sub-directory in which libtool stores uninstalled libraries.])
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AC_DEFUN([AC_LTDL_DLPREOPEN],
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[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
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AC_CACHE_CHECK([whether libtool supports -dlopen/-dlpreopen],
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[libltdl_cv_preloaded_symbols],
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[if test -n "$lt_cv_sys_global_symbol_pipe"; then
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libltdl_cv_preloaded_symbols=yes
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libltdl_cv_preloaded_symbols=no
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if test x"$libltdl_cv_preloaded_symbols" = xyes; then
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AC_DEFINE(HAVE_PRELOADED_SYMBOLS, 1,
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[Define if libtool can extract symbol lists from object files.])
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])# AC_LTDL_DLPREOPEN
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AC_DEFUN([AC_LTDL_DLLIB],
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[m4_pattern_allow([^LT_DLLOADERS$])
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AC_SUBST([LT_DLLOADERS])
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AC_CHECK_LIB([dl], [dlopen],
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[AC_DEFINE([HAVE_LIBDL], [1],
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[Define if you have the libdl library or equivalent.])
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LIBADD_DLOPEN="-ldl" libltdl_cv_lib_dl_dlopen="yes"
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LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
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[AC_TRY_LINK([#if HAVE_DLFCN_H
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[AC_DEFINE([HAVE_LIBDL], [1],
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[Define if you have the libdl library or equivalent.])
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libltdl_cv_func_dlopen="yes"
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LT_DLLOADERS="$LT_DLLOADERS dlopen.la"],
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[AC_CHECK_LIB([svld], [dlopen],
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[AC_DEFINE([HAVE_LIBDL], [1],
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[Define if you have the libdl library or equivalent.])
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LIBADD_DLOPEN="-lsvld" libltdl_cv_func_dlopen="yes"
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LT_DLLOADERS="$LT_DLLOADERS dlopen.la"])])])
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if test x"$libltdl_cv_func_dlopen" = xyes || test x"$libltdl_cv_lib_dl_dlopen" = xyes
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LIBS="$LIBS $LIBADD_DLOPEN"
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AC_CHECK_FUNCS([dlerror])
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AC_SUBST([LIBADD_DLOPEN])
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AC_CHECK_FUNC([shl_load],
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[AC_DEFINE([HAVE_SHL_LOAD], [1],
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[Define if you have the shl_load function.])
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LT_DLLOADERS="$LT_DLLOADERS shl_load.la"],
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[AC_CHECK_LIB([dld], [shl_load],
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[AC_DEFINE([HAVE_SHL_LOAD], [1],
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[Define if you have the shl_load function.])
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LT_DLLOADERS="$LT_DLLOADERS shl_load.la"
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LIBADD_SHL_LOAD="-ldld"])])
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AC_SUBST([LIBADD_SHL_LOAD])
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AC_CHECK_FUNC([_dyld_func_lookup],
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[AC_DEFINE([HAVE_DYLD], [1],
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[Define if you have the _dyld_func_lookup function.])
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LT_DLLOADERS="$LT_DLLOADERS dyld.la"])
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LT_DLLOADERS="$LT_DLLOADERS load_add_on.la"
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cygwin* | mingw* | os2* | pw32*)
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LT_DLLOADERS="$LT_DLLOADERS loadlibrary.la"
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AC_CHECK_LIB([dld], [dld_link],
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[AC_DEFINE([HAVE_DLD], [1],
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[Define if you have the GNU dld library.])
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LT_DLLOADERS="$LT_DLLOADERS dld_link.la"])
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AC_SUBST([LIBADD_DLD_LINK])
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m4_pattern_allow([^LT_DLPREOPEN$])
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for lt_loader in $LT_DLLOADERS; do
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LT_DLPREOPEN="$LT_DLPREOPEN-dlpreopen loaders/$lt_loader "
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AC_SUBST([LT_DLPREOPEN])
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dnl This isn't used anymore, but set it for backwards compatibility
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LIBADD_DL="$LIBADD_DLOPEN $LIBADD_SHL_LOAD"
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AC_SUBST([LIBADD_DL])
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# AC_LTDL_SYMBOL_USCORE
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# ---------------------
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# does the compiler prefix global symbols with an underscore?
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AC_DEFUN([AC_LTDL_SYMBOL_USCORE],
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[AC_REQUIRE([AC_LIBTOOL_SYS_GLOBAL_SYMBOL_PIPE])
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AC_CACHE_CHECK([for _ prefix in compiled symbols],
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[ac_cv_sys_symbol_underscore],
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[ac_cv_sys_symbol_underscore=no
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cat > conftest.$ac_ext <<EOF
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void nm_test_func(){}
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int main(){nm_test_func;return 0;}
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if AC_TRY_EVAL(ac_compile); then
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# Now try to grab the symbols.
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if AC_TRY_EVAL(NM conftest.$ac_objext \| $lt_cv_sys_global_symbol_pipe \> $ac_nlist) && test -s "$ac_nlist"; then
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# See whether the symbols have a leading underscore.
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if grep '^. _nm_test_func' "$ac_nlist" >/dev/null; then
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ac_cv_sys_symbol_underscore=yes
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if grep '^. nm_test_func ' "$ac_nlist" >/dev/null; then
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echo "configure: cannot find nm_test_func in $ac_nlist" >&AS_MESSAGE_LOG_FD
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echo "configure: cannot run $lt_cv_sys_global_symbol_pipe" >&AS_MESSAGE_LOG_FD
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echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
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cat conftest.c >&AS_MESSAGE_LOG_FD
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])# AC_LTDL_SYMBOL_USCORE
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# AC_LTDL_DLSYM_USCORE
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# --------------------
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AC_DEFUN([AC_LTDL_DLSYM_USCORE],
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[AC_REQUIRE([AC_LTDL_SYMBOL_USCORE])
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if test x"$ac_cv_sys_symbol_underscore" = xyes; then
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if test x"$libltdl_cv_func_dlopen" = xyes ||
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test x"$libltdl_cv_lib_dl_dlopen" = xyes ; then
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AC_CACHE_CHECK([whether we have to add an underscore for dlsym],
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[libltdl_cv_need_uscore],
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[libltdl_cv_need_uscore=unknown
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LIBS="$LIBS $LIBADD_DLOPEN"
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_LT_AC_TRY_DLOPEN_SELF(
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[libltdl_cv_need_uscore=no], [libltdl_cv_need_uscore=yes],
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[], [libltdl_cv_need_uscore=cross])
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if test x"$libltdl_cv_need_uscore" = xyes; then
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AC_DEFINE(NEED_USCORE, 1,
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[Define if dlsym() requires a leading underscore in symbol names.])
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])# AC_LTDL_DLSYM_USCORE
added
removed
m4/ltdl.m4
