From c035825792ecf28d0fb9aa24049a903fcb0d894b Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Mon, 28 Oct 2019 17:59:35 +0000
Subject: [PATCH] Update libstdc++ library version detection: fixes
 https://github.com/boostorg/config/issues/302

---
 include/boost/config/stdlib/libstdcpp3.hpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/boost/config/stdlib/libstdcpp3.hpp b/include/boost/config/stdlib/libstdcpp3.hpp
index 84ea759a..12106e2b 100644
--- a/include/boost/config/stdlib/libstdcpp3.hpp
+++ b/include/boost/config/stdlib/libstdcpp3.hpp
@@ -125,7 +125,13 @@
 //
 #ifdef __clang__
 
-#if __has_include(<experimental/memory_resource>)
+#if __has_include(<memory_resource>)
+#  define BOOST_LIBSTDCXX_VERSION 90100
+#elif __has_include(<charconv>)
+#  define BOOST_LIBSTDCXX_VERSION 80100
+#elif __has_include(<variant>)
+#  define BOOST_LIBSTDCXX_VERSION 70100
+#elif __has_include(<experimental/memory_resource>)
 #  define BOOST_LIBSTDCXX_VERSION 60100
 #elif __has_include(<experimental/any>)
 #  define BOOST_LIBSTDCXX_VERSION 50100
@@ -231,7 +237,6 @@ extern "C" char *gets (char *__s);
 #  define BOOST_NO_CXX11_HDR_RATIO
 #  define BOOST_NO_CXX11_HDR_SYSTEM_ERROR
 #  define BOOST_NO_CXX11_SMART_PTR
-#  define BOOST_NO_CXX11_HDR_EXCEPTION
 #else
 #  define BOOST_HAS_TR1_COMPLEX_INVERSE_TRIG 
 #  define BOOST_HAS_TR1_COMPLEX_OVERLOADS