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

depends/x86_64-pc-linux-gnu/include/boost/pool/detail/guard.hpp

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+// Copyright (C) 2000 Stephen Cleary
+//
+// 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)
+//
+// See http://www.boost.org for updates, documentation, and revision history.
+
+#ifndef BOOST_POOL_GUARD_HPP
+#define BOOST_POOL_GUARD_HPP
+
+/*!
+  \file
+  \brief Extremely Light-Weight guard class.
+  \details Auto-lock/unlock-er
+  detail/guard.hpp provides a type guard<Mutex>
+  that allows scoped access to the Mutex's locking and unlocking operations.
+  It is used to ensure that a Mutex is unlocked, even if an exception is thrown.
+*/
+
+namespace boost {
+
+namespace details {
+namespace pool {
+
+template <typename Mutex> //!< \tparam Mutex (platform-specific) mutex class.
+class guard
+{ //! Locks the mutex, binding guard<Mutex> to Mutex.
+	/*! Example:
+	Given a (platform-specific) mutex class, we can wrap code as follows:
+
+	extern mutex global_lock;
+
+	static void f()
+	{
+		boost::details::pool::guard<mutex> g(global_lock);
+		// g's constructor locks "global_lock"
+
+		... // do anything:
+				//   throw exceptions
+				//   return
+				//   or just fall through
+	} // g's destructor unlocks "global_lock"
+	*/
+  private:
+    Mutex & mtx;
+
+    guard(const guard &); //!< Guards the mutex, ensuring unlocked on destruction, even if exception is thrown.
+    void operator=(const guard &);
+
+  public:
+    explicit guard(Mutex & nmtx)
+    :mtx(nmtx)
+    { //! Locks the mutex of the guard class.
+			mtx.lock();
+		}
+
+    ~guard()
+    { //! destructor unlocks the mutex of the guard class.
+			mtx.unlock();
+		}
+}; // class guard
+
+} // namespace pool
+} // namespace details
+
+} // namespace boost
+
+#endif