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

depends/x86_64-pc-linux-gnu/include/boost/fiber/properties.hpp

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+//          Copyright Nat Goodspeed 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)
+
+// Define fiber_properties, a base class from which a library consumer can
+// derive a subclass with specific properties important to a user-coded
+// scheduler.
+
+#ifndef BOOST_FIBERS_PROPERTIES_HPP
+#define BOOST_FIBERS_PROPERTIES_HPP
+
+#include <boost/fiber/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+# if defined(BOOST_MSVC)
+# pragma warning(push)
+# pragma warning(disable:4275)
+# endif
+
+namespace boost {
+namespace fibers {
+
+class context;
+
+namespace algo {
+
+struct algorithm;
+
+}
+
+class BOOST_FIBERS_DECL fiber_properties {
+protected:
+    // initialized by constructor
+    context         *   ctx_;
+    // set every time this fiber becomes READY
+    algo::algorithm *   algo_{ nullptr };
+
+    // Inform the relevant algorithm instance that something important
+    // has changed, so it can (presumably) adjust its data structures
+    // accordingly.
+    void notify() noexcept;
+
+public:
+    // Any specific property setter method, after updating the relevant
+    // instance variable, can/should call notify().
+
+    // fiber_properties, and by implication every subclass, must accept a back
+    // pointer to its context.
+    fiber_properties( context * ctx) noexcept :
+        ctx_{ ctx } {
+    }
+
+    // We need a virtual destructor (hence a vtable) because fiber_properties
+    // is stored polymorphically (as fiber_properties*) in context, and
+    // destroyed via that pointer.
+    virtual ~fiber_properties() = default;
+
+    // not really intended for public use, but algorithm_with_properties
+    // must be able to call this
+    void set_algorithm( algo::algorithm * algo) noexcept {
+        algo_ = algo;
+    }
+};
+
+}} // namespace boost::fibers
+
+# if defined(BOOST_MSVC)
+# pragma warning(pop)
+# endif
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_FIBERS_PROPERTIES_HPP