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

depends/x86_64-pc-linux-gnu/include/boost/chrono/detail/no_warning/signed_unsigned_cmp.hpp

@@ -0,0 +1,54 @@
+//  is_evenly_divisible_by.hpp  --------------------------------------------------------------//
+
+//  Copyright 2009-2010 Vicente J. Botet Escriba
+
+//  Distributed under the Boost Software License, Version 1.0.
+//  See http://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_CHRONO_DETAIL_NO_WARNING_SIGNED_UNSIGNED_CMP_HPP
+#define BOOST_CHRONO_DETAIL_NO_WARNING_SIGNED_UNSIGNED_CMP_HPP
+
+//
+// We simply cannot include this header on gcc without getting copious warnings of the kind:
+//
+//../../../boost/chrono/detail/no_warning/signed_unsigned_cmp.hpp:37: warning: comparison between signed and unsigned integer expressions
+//
+// And yet there is no other reasonable implementation, so we declare this a system header
+// to suppress these warnings.
+//
+
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+#pragma GCC system_header
+#elif defined __SUNPRO_CC
+#pragma disable_warn
+#elif defined _MSC_VER
+#pragma warning(push, 1)
+#endif
+
+namespace boost {
+namespace chrono {
+namespace detail {
+
+  template <class T, class U>
+  bool lt(T t, U u)
+  {
+    return t < u;
+  }
+
+  template <class T, class U>
+  bool gt(T t, U u)
+  {
+    return t > u;
+  }
+
+} // namespace detail
+} // namespace detail
+} // namespace chrono
+
+#if defined __SUNPRO_CC
+#pragma enable_warn
+#elif defined _MSC_VER
+#pragma warning(pop)
+#endif
+
+#endif // BOOST_CHRONO_DETAIL_NO_WARNING_SIGNED_UNSIGNED_CMP_HPP