From d39ce839d1d9a860dcc0dc2b61e9a19731cbed41 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Sat, 9 May 2020 16:36:21 +0300
Subject: [PATCH 1/2] Remove prefix from feature check messages

---
 checks/config.jam | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/checks/config.jam b/checks/config.jam
index c5adfe7b..a19dd385 100644
--- a/checks/config.jam
+++ b/checks/config.jam
@@ -12,9 +12,7 @@ rule requires ( names + )
    local result ;
    for name in $(names)
    {
-      local msg = "Boost.Config Feature Check: " ;
-      msg += $(name) ;
-      result += [ check-target-builds $(config-binding:D)//$(name) $(msg:J=) : : <build>no ] ;
+      result += [ check-target-builds $(config-binding:D)//$(name) $(name) : : <build>no ] ;
    }
    return $(result) ;
 }

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 2/2] 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