From cbc2f847090d866aa4a482b714e6d2fb4633d0d1 Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Mon, 6 Jun 2022 14:09:07 +0300
Subject: [PATCH] Enabled C++17 CTAD guides for MSVC 14.14 (VS2017 Update 7)
 and later.

MSVC doesn't define the standard feature detection macros, so we have to
resort to compiler version checks.
---
 include/boost/config/detail/suffix.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/boost/config/detail/suffix.hpp b/include/boost/config/detail/suffix.hpp
index 318ffa9c..13d4bb6a 100644
--- a/include/boost/config/detail/suffix.hpp
+++ b/include/boost/config/detail/suffix.hpp
@@ -1219,7 +1219,11 @@ namespace std{ using ::type_info; }
 #  define BOOST_NO_CXX20_HDR_VERSION
 #endif
 
-#if !defined(__cpp_deduction_guides) || (__cpp_deduction_guides < 201606)
+#if defined(BOOST_MSVC)
+#if (BOOST_MSVC < 1914) || (_MSVC_LANG < 201703)
+#  define BOOST_NO_CXX17_DEDUCTION_GUIDES
+#endif
+#elif !defined(__cpp_deduction_guides) || (__cpp_deduction_guides < 201606)
 #  define BOOST_NO_CXX17_DEDUCTION_GUIDES
 #endif