## 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 "$host_os" in
	linux*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	netbsd*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	openbsd*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	solaris*)
	  libltdl_cv_sys_dlopen_deplibs=yes
	  ;;
	esac
])
if test "$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