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

depends/x86_64-pc-linux-gnu/include/boost/fiber/barrier.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)
+
+#ifndef BOOST_FIBERS_BARRIER_H
+#define BOOST_FIBERS_BARRIER_H
+
+#include <cstddef>
+
+#include <boost/config.hpp>
+
+#include <boost/fiber/condition_variable.hpp>
+#include <boost/fiber/detail/config.hpp>
+#include <boost/fiber/mutex.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace fibers {
+
+class BOOST_FIBERS_DECL barrier {
+private:
+    std::size_t         initial_;
+    std::size_t         current_;
+    std::size_t         cycle_{ 0 };
+    mutex               mtx_{};
+    condition_variable  cond_{};
+
+public:
+    explicit barrier( std::size_t);
+
+    barrier( barrier const&) = delete;
+    barrier & operator=( barrier const&) = delete;
+
+    bool wait();
+};
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#  include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_FIBERS_BARRIER_H