2000-04-05  Benjamin Kosnik  <bkoz@cygnus.com>
            Martin v. Loewis  <martin@loewis.home.cs.tu-berlin.de>

        * configure.in (enable_libstdcxx_v3): Add.
        (target_libs): Add bits here to switch between libstdc++-v2 and
        libstdc++-v3.
        * config.if: And this file too.
        * Makefile.in: Add libstdc++-v3 targets.

Co-Authored-By: Martin v. Loewis <martin@loewis.home.cs.tu-berlin.de>

From-SVN: r32963

config.if (cxx_interface, [...]): Do not try to set these if the appropriate directories and files to not exist.

P
        * config.if (cxx_interface, libstdcxx_interface): Do not try to set
        these if the appropriate directories and files to not exist.

From-SVN: r23166

        * configure (gxx_include_dir): Changed to
        '${prefix}/include/g++'-${libstdcxx_interface}.
        * config.if: New to determine the interfaces.

From-SVN: r22109