From 91aeb86f5734800e1bb3426562306d86fcc0082a Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Sat, 22 Sep 2018 21:00:06 +0300
Subject: [PATCH] Disable constexpr on g++ 5

---
 include/boost/system/detail/config.hpp |  4 ++++
 include/boost/system/error_code.hpp    | 19 -------------------
 2 files changed, 4 insertions(+), 19 deletions(-)

diff --git a/include/boost/system/detail/config.hpp b/include/boost/system/detail/config.hpp
index fde93cb..2ad8201 100644
--- a/include/boost/system/detail/config.hpp
+++ b/include/boost/system/detail/config.hpp
@@ -33,6 +33,10 @@
 # define BOOST_SYSTEM_HAS_CONSTEXPR
 #endif
 
+#if BOOST_WORKAROUND(BOOST_GCC, < 60000)
+# undef BOOST_SYSTEM_HAS_CONSTEXPR
+#endif
+
 #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
 # define BOOST_SYSTEM_CONSTEXPR constexpr
 #else
diff --git a/include/boost/system/error_code.hpp b/include/boost/system/error_code.hpp
index c2b1bc0..f413980 100644
--- a/include/boost/system/error_code.hpp
+++ b/include/boost/system/error_code.hpp
@@ -392,25 +392,6 @@ inline bool failed_impl( int ev, error_category const & cat )
     return cat.failed( ev );
 }
 
-#elif BOOST_WORKAROUND(BOOST_GCC, < 60000)
-
-inline bool failed2_impl( int ev, error_category const & cat )
-{
-    return cat.failed( ev );
-}
-
-BOOST_SYSTEM_CONSTEXPR inline bool failed_impl( int ev, error_category const & cat )
-{
-    if( cat == system_category() || cat == generic_category() )
-    {
-        return ev != 0;
-    }
-    else
-    {
-        return failed2_impl( ev, cat );
-    }
-}
-
 #else
 
 BOOST_SYSTEM_CONSTEXPR inline bool failed_impl( int ev, error_category const & cat )