From 48a22d91b3c8df42c00d76631c21ab3840296971 Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Sat, 23 May 2020 19:46:40 +0300
Subject: [PATCH] Detect libstdc++ from gcc 10 by the presence of <compare>
 header.

---
 include/boost/config/stdlib/libstdcpp3.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/boost/config/stdlib/libstdcpp3.hpp b/include/boost/config/stdlib/libstdcpp3.hpp
index c4c99960..ee8f2a20 100644
--- a/include/boost/config/stdlib/libstdcpp3.hpp
+++ b/include/boost/config/stdlib/libstdcpp3.hpp
@@ -125,7 +125,9 @@
 //
 #ifdef __clang__
 
-#if __has_include(<memory_resource>)
+#if __has_include(<compare>)
+#  define BOOST_LIBSTDCXX_VERSION 100100
+#elif __has_include(<memory_resource>)
 #  define BOOST_LIBSTDCXX_VERSION 90100
 #elif __has_include(<charconv>)
 #  define BOOST_LIBSTDCXX_VERSION 80100