stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

depends/x86_64-pc-linux-gnu/include/boost/atomic/detail/bitwise_cast.hpp

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+/*
+ * 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)
+ *
+ * Copyright (c) 2009 Helge Bahmann
+ * Copyright (c) 2012 Tim Blechmann
+ * Copyright (c) 2013 - 2014 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/bitwise_cast.hpp
+ *
+ * This header defines \c bitwise_cast used to convert between storage and value types
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_
+
+#include <boost/atomic/detail/config.hpp>
+#if !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY)
+#include <cstring>
+#endif
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+template< typename T >
+BOOST_FORCEINLINE T* addressof(T& value) BOOST_NOEXCEPT
+{
+    // Note: The point of using a local struct as the intermediate type instead of char is to avoid gcc warnings
+    // if T is a const volatile char*:
+    // warning: casting ‘const volatile char* const’ to ‘const volatile char&’ does not dereference pointer
+    // The local struct makes sure T is not related to the cast target type.
+    struct opaque_type;
+    return reinterpret_cast< T* >(&const_cast< opaque_type& >(reinterpret_cast< const volatile opaque_type& >(value)));
+}
+
+template< typename To, typename From >
+BOOST_FORCEINLINE To bitwise_cast(From const& from) BOOST_NOEXCEPT
+{
+    struct
+    {
+        To to;
+    }
+    value = {};
+    BOOST_ATOMIC_DETAIL_MEMCPY
+    (
+        atomics::detail::addressof(value.to),
+        atomics::detail::addressof(from),
+        (sizeof(From) < sizeof(To) ? sizeof(From) : sizeof(To))
+    );
+    return value.to;
+}
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_BITWISE_CAST_HPP_INCLUDED_