From ee80491cabdeb9ef19592c2c2155a841a6d09536 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Mon, 6 Mar 2023 07:49:33 +0200
Subject: [PATCH] Add C++03 deprecation notice

---
 include/boost/system/detail/config.hpp        |  1 +
 .../boost/system/detail/requires_cxx11.hpp    | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 include/boost/system/detail/requires_cxx11.hpp

diff --git a/include/boost/system/detail/config.hpp b/include/boost/system/detail/config.hpp
index 4164b53..1231291 100644
--- a/include/boost/system/detail/config.hpp
+++ b/include/boost/system/detail/config.hpp
@@ -8,6 +8,7 @@
 //
 // See http://www.boost.org/libs/system for documentation.
 
+#include <boost/system/detail/requires_cxx11.hpp>
 #include <boost/config.hpp>
 #include <boost/config/workaround.hpp>
 
diff --git a/include/boost/system/detail/requires_cxx11.hpp b/include/boost/system/detail/requires_cxx11.hpp
new file mode 100644
index 0000000..1bf6a1f
--- /dev/null
+++ b/include/boost/system/detail/requires_cxx11.hpp
@@ -0,0 +1,21 @@
+#ifndef BOOST_SYSTEM_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
+#define BOOST_SYSTEM_DETAIL_REQUIRES_CXX11_HPP_INCLUDED
+
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if defined(BOOST_NO_CXX11_CONSTEXPR) || \
+    defined(BOOST_NO_CXX11_NOEXCEPT) || \
+    defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS) || \
+    defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || \
+    defined(BOOST_NO_CXX11_HDR_SYSTEM_ERROR)
+
+BOOST_PRAGMA_MESSAGE("C++03 support is deprecated in Boost.System 1.82 and will be removed in Boost.System 1.84.")
+
+#endif
+
+#endif // #ifndef BOOST_SYSTEM_DETAIL_REQUIRES_CXX11_HPP_INCLUDED