From 8dcea4d78c7a9bd07322015d541fb76c77e33022 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Tue, 29 Oct 2019 09:29:04 +0000
Subject: [PATCH] Add version check for C++17 features in suffix.hpp Fixes
 https://github.com/boostorg/config/issues/287.

---
 include/boost/config/detail/suffix.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/config/detail/suffix.hpp b/include/boost/config/detail/suffix.hpp
index 584d3ab7..e7e379d8 100644
--- a/include/boost/config/detail/suffix.hpp
+++ b/include/boost/config/detail/suffix.hpp
@@ -1042,7 +1042,7 @@ namespace std{ using ::type_info; }
 #endif
 
 // This is a catch all case for obsolete compilers / std libs:
-#if !defined(__has_include)
+#if (!defined(__has_include) || (__cplusplus < 201700)) && !defined(_MSC_VER)
 #  define BOOST_NO_CXX17_HDR_OPTIONAL
 #  define BOOST_NO_CXX17_HDR_STRING_VIEW
 #  define BOOST_NO_CXX17_HDR_VARIANT