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dnl Autoconf macro for an always external libltdl
dnl Copyright (C) 2009 Heikki Lindholm
dnl
dnl This file is free software; as a special exception the author gives
dnl unlimited permission to copy and/or distribute it, with or without
dnl modifications, as long as this notice is preserved.
dnl
dnl This file is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
dnl AM_PATH_LIBLTDL(
dnl [CHECK-SYMBOLS, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
dnl
AC_DEFUN([AM_PATH_LIBLTDL],
[ AC_ARG_WITH(libltdl-prefix,
AC_HELP_STRING([--with-libltdl-prefix=PFX],
[prefix where libltdl is installed (optional)]),
libltdl_prefix="$withval", libltdl_prefix="")
ltdl_save_CPPFLAGS="$CPPFLAGS"
ltdl_save_LDFLAGS="$LDFLAGS"
if test x$libltdl_prefix != x ; then
CPPFLAGS="-I$libltdl_prefix/include $CPPFLAGS"
LDFLAGS="-L$libltdl_prefix/lib -lltdl $LDFLAGS"
else
if test x"$LIBLTDL" = x ; then
LIBLTDL="-lltdl"
fi
CPPFLAGS="$LTDLINCL $CPPFLAGS"
LDFLAGS="$LIBLTDL $LDFLAGS"
fi
symbols_to_check=ifelse([$1], ,"ltdl_dlopen","$1")
ltdl_found=yes
AC_CHECK_HEADER([ltdl.h],
[
for sym in $symbols_to_check
do
AC_CHECK_DECL([$sym],
[AC_LINK_IFELSE(AC_LANG_CALL([], [$sym]),
[ltdl_found=yes],
[ltdl_found=no])],
[ltdl_found=no],
[AC_INCLUDES_DEFAULT
#include <ltdl.h>])
done
],
[ltdl_found=no],
[AC_INCLUDES_DEFAULT]
)
if test x$libltdl_prefix != x ; then
LTDLINCL="-I$libltdl_prefix/include"
LIBLTDL="-L$libltdl_prefix/lib -lltdl"
else
if test x"$LIBLTDL" = x ; then
LIBLTDL="-lltdl"
fi
fi
CPPFLAGS="$ltdl_save_CPPFLAGS"
LDFLAGS="$ltdl_save_LDFLAGS"
AC_MSG_CHECKING(for libltdl with symbols $symbols_to_check)
if test $ltdl_found = yes; then
AC_MSG_RESULT(yes)
ifelse([$2], , :, [$2])
else
LTDLINCL=""
LIBLTDL=""
AC_MSG_RESULT(no)
ifelse([$3], , :, [$3])
fi
AC_SUBST(LTDLINCL)
AC_SUBST(LIBLTDL)
])
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