# OVERVIEW##   Set up for building SWIG bindings.  Note that shipped tarballs contain pre-built#   SWIG bindings, so there should be no need for SWIG on non-developer machines.# SYNOPSIS##   Find perl and SWIG, and substitute PERL_INC, the -I command that will lead the compiler#   to perl.h and friends.##   Supports --with-perlextlibs, for adding extra LIBS declarations to perl extensions.#AC_DEFUN([AMANDA_SETUP_SWIG],[    AC_REQUIRE([AMANDA_PROG_SWIG])    AC_REQUIRE([AMANDA_PROG_PERL])    # If we want cygwin to copy ddl to modules directory.    WANT_CYGWIN_COPY_PERL_DLL="false"    # get the include path for building perl extensions    PERL_INC=`$PERL -MExtUtils::Embed -e perl_inc`    AC_SUBST(PERL_INC)    if test x"$enable_shared" = x"no"; then	AC_MSG_ERROR([*** Amanda cannot be compiled without shared-library support (do not use --disable-shared)])    fi    case "$target" in	*freebsd@<:@123456@:>@*) # up to and including FreeBSD 6.*	    # Before 7.0, FreeBSD systems don't include a DT_NEEDS segment in	    # libgthread to automatically pull in the desired threading library.	    # Instead, they assume that any application linking against	    # libgthread will pull in the threading library.  This is fine for	    # Amanda C applications, but for Perl applications this assumption	    # means that the perl binary would pull in the threading library.	    # But perl is compiled without threading by default.  	    #	    # Specifically, this occurs on any FreeBSD using gcc-3.*: the linking	    # decision is made in gcc's spec files, which were changed in	    # gcc-4.0.  For a more in-depth discussion, see	    #  http://wiki.zmanda.com/index.php/Installation/OS_Specific_Notes/Installing_Amanda_on_FreeBSD	    #	    # The easiest solution for the "default" case is to link all perl	    # extension libraries against the threading library, so it is loaded	    # when perl loads the extension library.  The default threading	    # library in FreeBSD is libpthread.  The below default will work on	    # such a FreeBSD system, but ports maintainers and those with	    # different configurations may need to override this value with	    # --with-perlextlibs.	    #	    # We can't use -pthread because gcc on FreeBSD ignores -pthread in	    # combination with -shared.  See	    #   http://lists.freebsd.org/pipermail/freebsd-stable/2006-June/026229.html	    PERLEXTLIBS="-lpthread"	    ;;	*-pc-cygwin)	    # When need -lperl and the '-L' where it is located,	    # we don't want the DynaLoader.a	    PERLEXTLIBS=`perl -MExtUtils::Embed -e ldopts | sed -e 's/^.*-L/-L/'`	    WANT_CYGWIN_COPY_PERL_DLL="true";	    ;;    esac    AM_CONDITIONAL(WANT_CYGWIN_COPY_PERL_DLL,$WANT_CYGWIN_COPY_PERL_DLL)    AC_ARG_WITH(perlextlibs,	AC_HELP_STRING([--with-perlextlibs=libs],[extra LIBS for Perl extensions]),	[	    case "$withval" in		y|ye|yes) AC_MSG_ERROR([*** You must specify a value for --with-perlextlibs]);;		n|no) PERLEXTLIBS='';;		*) PERLEXTLIBS="$withval" ;;	    esac	])    AC_SUBST(PERLEXTLIBS)])