Integrated the not yet accepted boost::nowide library, thanks @alexrj.

xs/src/boost/nowide/system.hpp

@@ -0,0 +1,46 @@
+//
+//  Copyright (c) 2012 Artyom Beilis (Tonkikh)
+//
+//  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_NOWIDE_CSTDLIB_HPP
+#define BOOST_NOWIDE_CSTDLIB_HPP
+
+#include <stdlib.h>
+#include <errno.h>
+#include <boost/nowide/stackstring.hpp>
+namespace boost {
+namespace nowide {
+
+#if !defined(BOOST_WINDOWS) && !defined(BOOST_NOWIDE_DOXYGEN)
+
+using ::system;
+
+#else // Windows
+
+///
+/// Same as std::system but cmd is UTF-8.
+///
+/// If the input is not valid UTF-8, -1 returned and errno set to EINVAL
+///
+inline int system(char const *cmd)
+{
+    if(!cmd)
+        return _wsystem(0);
+    wstackstring wcmd;
+    if(!wcmd.convert(cmd)) {
+        errno = EINVAL;
+        return -1;
+    }
+    return _wsystem(wcmd.c_str());
+}
+
+#endif
+} // nowide
+} // namespace boost
+
+#endif
+///
+// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4