add boost on mac

macx64/include/boost/context/detail/exception.hpp

@@ -0,0 +1,48 @@
+
+//          Copyright Oliver Kowalke 2014.
+// Distributed under 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)
+
+#ifndef BOOST_CONTEXT_DETAIL_EXCEPTION_H
+#define BOOST_CONTEXT_DETAIL_EXCEPTION_H
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+
+#include <boost/context/detail/fcontext.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace context {
+namespace detail {
+
+struct forced_unwind {
+    fcontext_t  fctx{ nullptr };
+#ifndef BOOST_ASSERT_IS_VOID
+    bool        caught{ false };
+#endif
+
+    forced_unwind() = default;
+
+    forced_unwind( fcontext_t fctx_) :
+        fctx( fctx_) {
+    }
+
+#ifndef BOOST_ASSERT_IS_VOID
+    ~forced_unwind() {
+        BOOST_ASSERT( caught);
+    }
+#endif
+};
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CONTEXT_DETAIL_EXCEPTION_H