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

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

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+
+//          Copyright Oliver Kowalke 2013.
+// 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)
+//
+//          based on tss.hpp from boost.thread
+
+#ifndef BOOST_FIBERS_DETAIL_FSS_H
+#define BOOST_FIBERS_DETAIL_FSS_H
+
+#include <atomic>
+#include <cstddef>
+
+#include <boost/config.hpp>
+#include <boost/intrusive_ptr.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace fibers {
+namespace detail {
+
+class fss_cleanup_function {
+private:
+    std::atomic< std::size_t >  use_count_{ 0 };
+
+public:
+    typedef intrusive_ptr< fss_cleanup_function >   ptr_t;
+
+    fss_cleanup_function() noexcept = default;
+
+    virtual ~fss_cleanup_function() = default;
+
+    virtual void operator()( void * data) = 0;
+
+    friend inline
+    void intrusive_ptr_add_ref( fss_cleanup_function * p) noexcept {
+        p->use_count_.fetch_add( 1, std::memory_order_relaxed);
+    }
+
+    friend inline
+    void intrusive_ptr_release( fss_cleanup_function * p) noexcept {
+        if ( 1 == p->use_count_.fetch_sub( 1, std::memory_order_release) ) {
+            std::atomic_thread_fence( std::memory_order_acquire);
+            delete p;
+        }
+    }
+};
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif //  BOOST_FIBERS_DETAIL_FSS_H