add boost on mac

macx64/include/boost/stacktrace/detail/void_ptr_cast.hpp

@@ -0,0 +1,46 @@
+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015-2019 Antony Polukhin.
+//
+// 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_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
+#define BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <boost/static_assert.hpp>
+#include <boost/type_traits/is_pointer.hpp>
+
+#if defined(__GNUC__) && defined(__GNUC_MINOR__) && (__GNUC__ * 100 + __GNUC_MINOR__ > 301)
+#   pragma GCC system_header
+#endif
+
+namespace boost { namespace stacktrace { namespace detail {
+
+// GCC warns when reinterpret_cast between function pointer and object pointer occur.
+// This functionsuppress the warnings and ensures that such casts are safe.
+template <class To, class From>
+To void_ptr_cast(From* v) BOOST_NOEXCEPT {
+    BOOST_STATIC_ASSERT_MSG(
+        boost::is_pointer<To>::value,
+        "`void_ptr_cast` function must be used only for casting to or from void pointers."
+    );
+
+    BOOST_STATIC_ASSERT_MSG(
+        sizeof(From*) == sizeof(To),
+        "Pointer to function and pointer to object differ in size on your platform."
+    );
+
+    return reinterpret_cast<To>(v);
+}
+
+
+}}} // boost::stacktrace::detail
+
+#endif // BOOST_STACKTRACE_DETAIL_VOID_PTR_CAST_HPP
+