dnl @synopsis AX_BOOST_IOSTREAMS
dnl
dnl Test for IOStreams library from the Boost C++ libraries. The macro
dnl requires a preceding call to AX_BOOST_BASE. Further documentation
dnl is available at <http://randspringer.de/boost/index.html>.
dnl
dnl This macro calls:
dnl
dnl   AC_SUBST(BOOST_IOSTREAMS_LIB)
dnl
dnl And sets:
dnl
dnl   HAVE_BOOST_IOSTREAMS
dnl
dnl @category InstalledPackages
dnl @category Cxx
dnl @author Thomas Porschberg <thomas@randspringer.de>
dnl @version 2006-06-15
dnl @license AllPermissive
dnl
dnl Modified by me to make using iostreams the default and to fail if
dnl the user tries to disable it.  Also changed linking to check for
dnl libboost_iostreams-mt instead of libboost_iostreams and to fail
dnl if the library can't be found.
dnl    -- dburrows 2009-08-22

AC_DEFUN([AX_BOOST_IOSTREAMS],
[
	AC_ARG_WITH([boost-iostreams],
	AS_HELP_STRING([--with-boost-iostreams@<:@=special-lib@:>@],
                   [use the IOStreams library from boost - it is possible to specify a certain library for the linker
                        e.g. --with-boost-iostreams=boost_iostreams-gcc-mt-d-1_33_1 ]),
        [
        if test "$withval" = "no"; then
			want_boost="no"
        elif test "$withval" = "yes"; then
            want_boost="yes"
            ax_boost_user_iostreams_lib=""
        else
		    want_boost="yes"
        	ax_boost_user_iostreams_lib="$withval"
		fi
        ],
        [want_boost="yes"]
	)

	if test "x$want_boost" = "xyes"; then
        AC_REQUIRE([AC_PROG_CC])
		CPPFLAGS_SAVED="$CPPFLAGS"
		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
		export CPPFLAGS

		LDFLAGS_SAVED="$LDFLAGS"
		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
		export LDFLAGS

        AC_CACHE_CHECK(whether the Boost::IOStreams library is available,
					   ax_cv_boost_iostreams,
        [AC_LANG_PUSH([C++])
		 AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[@%:@include <boost/iostreams/filtering_stream.hpp>
											 @%:@include <boost/range/iterator_range.hpp>
											]],
                                  [[std::string  input = "Hello World!";
       								 namespace io = boost::iostreams;
									 io::filtering_istream  in(boost::make_iterator_range(input));
									 return 0;
                                   ]]),
                             ax_cv_boost_iostreams=yes, ax_cv_boost_iostreams=no)
         AC_LANG_POP([C++])
		])
		if test "x$ax_cv_boost_iostreams" = "xyes"; then
			AC_DEFINE(HAVE_BOOST_IOSTREAMS,,[define if the Boost::IOStreams library is available])
			BN=boost_iostreams
            if test "x$ax_boost_user_iostreams_lib" = "x"; then
				for ax_lib in $BN-mt $BN-$CC-mt $BN-$CC-mt-s \
                              lib$BN-mt lib$BN-$CC-mt lib$BN-$CC-mt-s \
                              $BN-mgw-mt $BN-mgw-mt-s \
			      $BN $BN-$CC $BN-$CC-s lib$BN lib$BN-$CC lib$BN-$CC-s ; do
				    AC_CHECK_LIB($ax_lib, main, [BOOST_IOSTREAMS_LIB="-l$ax_lib" AC_SUBST(BOOST_IOSTREAMS_LIB) link_iostreams="yes" break],
                                 [link_iostreams="no"])
  				done
            else
               for ax_lib in $ax_boost_user_iostreams_lib $BN-$ax_boost_user_iostreams_lib; do
				      AC_CHECK_LIB($ax_lib, main,
                                   [BOOST_IOSTREAMS_LIB="-l$ax_lib" AC_SUBST(BOOST_IOSTREAMS_LIB) link_iostreams="yes" break],
                                   [link_iostreams="no"])
                  done

            fi
			if test "x$link_iostreams" = "xno"; then
				AC_MSG_ERROR([Could not link against $ax_lib !])
			fi
		fi

		CPPFLAGS="$CPPFLAGS_SAVED"
    	LDFLAGS="$LDFLAGS_SAVED"
	else
		AC_MSG_ERROR([Boost IOStreams is required and may not be disabled.])
	fi
])