Incomplete work for using Boost.Polygon to compute medial axis

xs/src/boost/config/stdlib/libcpp.hpp

@@ -0,0 +1,37 @@
+//  (C) Copyright Christopher Jefferson 2011.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org for most recent version.
+
+//  config for libc++
+//  Might need more in here later.
+
+#if !defined(_LIBCPP_VERSION)
+#  include <ciso646>
+#  if !defined(_LIBCPP_VERSION)
+#      error "This is not libc++!"
+#  endif
+#endif
+
+#define BOOST_STDLIB "libc++ version " BOOST_STRINGIZE(_LIBCPP_VERSION)
+
+#define BOOST_HAS_THREADS
+
+#ifdef _LIBCPP_HAS_NO_VARIADICS
+#    define BOOST_NO_CXX11_HDR_TUPLE
+#endif
+
+//
+// These appear to be unusable/incomplete so far:
+//
+#  define BOOST_NO_CXX11_HDR_CHRONO
+#  define BOOST_NO_CXX11_HDR_FUTURE
+#  define BOOST_NO_CXX11_HDR_TYPE_TRAITS
+#  define BOOST_NO_CXX11_ATOMIC_SMART_PTR
+
+// libc++ uses a non-standard messages_base
+#define BOOST_NO_STD_MESSAGES
+
+//  --- end ---