From e5cd7bf85220e93c935eee8f33b34ecb5ca8e094 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Tue, 15 Jun 2021 02:25:13 +0300
Subject: [PATCH] Placate g++ 6 and earlier

---
 test/std_interop_test8.cpp | 26 ++++++++++++++++++++++++++
 test/std_interop_test9.cpp | 26 ++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/test/std_interop_test8.cpp b/test/std_interop_test8.cpp
index 913afa2..2754a40 100644
--- a/test/std_interop_test8.cpp
+++ b/test/std_interop_test8.cpp
@@ -5,6 +5,7 @@
 #include <boost/system/error_code.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <boost/config/pragma_message.hpp>
+#include <boost/config.hpp>
 #include <cerrno>
 
 #if !defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
@@ -21,9 +22,34 @@ enum my_errc
     my_enoent = ENOENT
 };
 
+#if defined(BOOST_GCC) && BOOST_GCC < 70000
+
+// g++ 6 and earlier do not allow specializations outside the namespace
+
+namespace boost
+{
+namespace system
+{
+
+template<> struct is_error_condition_enum<my_errc>: std::true_type {};
+
+} // namespace system
+} // namespace boost
+
+namespace std
+{
+
+template<> struct is_error_condition_enum<my_errc>: std::true_type {};
+
+} // namespace std
+
+#else
+
 template<> struct boost::system::is_error_condition_enum<my_errc>: std::true_type {};
 template<> struct std::is_error_condition_enum<my_errc>: std::true_type {};
 
+#endif
+
 boost::system::error_condition make_error_condition( my_errc e )
 {
     return boost::system::error_condition( e, boost::system::generic_category() );
diff --git a/test/std_interop_test9.cpp b/test/std_interop_test9.cpp
index 6fae6b5..b869792 100644
--- a/test/std_interop_test9.cpp
+++ b/test/std_interop_test9.cpp
@@ -5,6 +5,7 @@
 #include <boost/system/error_code.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <boost/config/pragma_message.hpp>
+#include <boost/config.hpp>
 #include <cerrno>
 
 #if !defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
@@ -21,9 +22,34 @@ enum my_errc
     my_enoent = ENOENT
 };
 
+#if defined(BOOST_GCC) && BOOST_GCC < 70000
+
+// g++ 6 and earlier do not allow specializations outside the namespace
+
+namespace boost
+{
+namespace system
+{
+
+template<> struct is_error_code_enum<my_errc>: std::true_type {};
+
+} // namespace system
+} // namespace boost
+
+namespace std
+{
+
+template<> struct is_error_code_enum<my_errc>: std::true_type {};
+
+} // namespace std
+
+#else
+
 template<> struct boost::system::is_error_code_enum<my_errc>: std::true_type {};
 template<> struct std::is_error_code_enum<my_errc>: std::true_type {};
 
+#endif
+
 boost::system::error_code make_error_code( my_errc e )
 {
     return boost::system::error_code( e, boost::system::generic_category() );