From 3bdea5dfa3b85bde0aad2c7c7d4c31e18eaf9ed8 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Sun, 16 Sep 2018 04:49:59 +0300
Subject: [PATCH] Disable constexpr on msvc-14.1

---
 include/boost/system/error_code.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/boost/system/error_code.hpp b/include/boost/system/error_code.hpp
index 8c433d3..251ddce 100644
--- a/include/boost/system/error_code.hpp
+++ b/include/boost/system/error_code.hpp
@@ -58,6 +58,12 @@
 #  undef BOOST_SYSTEM_HAS_CONSTEXPR
 #endif
 
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1920
+// msvc-14.1 does not implement correct static initialization for
+// classes with constexpr constructors
+#  undef BOOST_SYSTEM_HAS_CONSTEXPR
+#endif
+
 #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
 # define BOOST_SYSTEM_CONSTEXPR constexpr
 #else