Merge system and filesystem branches, bringing them in sync with N2415. Several filesystem bugs fixed, and current_path setter added.

[SVN r39173]

test/header_only_test.cpp

@@ -0,0 +1,31 @@
+//  error_code_test.cpp  -----------------------------------------------------//
+
+//  Copyright Beman Dawes 2007
+
+//  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 library home page at http://www.boost.org/libs/system
+
+//----------------------------------------------------------------------------// 
+
+//  VC++ 8.0 warns on usage of certain Standard Library and API functions that
+//  can cause buffer overruns or other possible security issues if misused.
+//  See http://msdn.microsoft.com/msdnmag/issues/05/05/SafeCandC/default.aspx
+//  But the wording of the warning is misleading and unsettling, there are no
+//  portable altersystem functions, and VC++ 8.0's own libraries use the
+//  functions in question. So turn off the warnings.
+#define _CRT_SECURE_NO_DEPRECATE
+#define _SCL_SECURE_NO_DEPRECATE
+
+#define BOOST_ERROR_CODE_HEADER_ONLY
+
+#include <boost/test/minimal.hpp>
+
+#include <boost/system/error_code.hpp>
+
+int test_main( int, char*[] )
+{
+  boost::system::error_code ec( 0, boost::system::system_category );
+  return 0;
+}