From d719bee32a651937f0e456efc4966e3954cfd532 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Thu, 3 Feb 2022 12:55:34 +0000
Subject: [PATCH] Correct Dinkumware header detection to account for clang-cl.
 Fixes https://github.com/boostorg/config/issues/417.

---
 include/boost/config/stdlib/dinkumware.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/boost/config/stdlib/dinkumware.hpp b/include/boost/config/stdlib/dinkumware.hpp
index a9d3706c..a98aaf79 100644
--- a/include/boost/config/stdlib/dinkumware.hpp
+++ b/include/boost/config/stdlib/dinkumware.hpp
@@ -176,7 +176,9 @@
 #endif
 
 // C++17 features
-#if !defined(_CPPLIB_VER) || (_CPPLIB_VER < 650) || !defined(BOOST_MSVC) || (BOOST_MSVC < 1910) || !defined(_HAS_CXX17) || (_HAS_CXX17 == 0)
+#if !defined(_CPPLIB_VER) || (_CPPLIB_VER < 650) \
+ || ((!defined(BOOST_MSVC) || (BOOST_MSVC < 1910))) && (!defined(__clang__) || !defined(_MSC_VER) || (_MSC_VER < 1929))\
+ || !defined(_HAS_CXX17) || (_HAS_CXX17 == 0)
 #  define BOOST_NO_CXX17_STD_APPLY
 #  define BOOST_NO_CXX17_ITERATOR_TRAITS
 #  define BOOST_NO_CXX17_HDR_STRING_VIEW
@@ -213,6 +215,12 @@
 #  define BOOST_NO_CXX20_HDR_SOURCE_LOCATION
 #  define BOOST_NO_CXX20_HDR_SYNCSTREAM
 #endif
+#if !defined(BOOST_NO_CXX20_HDR_COROUTINE) && !defined(__cpp_lib_coroutine)
+#  define BOOST_NO_CXX20_HDR_COROUTINE
+#endif
+#if !defined(BOOST_NO_CXX20_HDR_SOURCE_LOCATION) && !defined(__cpp_consteval)
+#  define BOOST_NO_CXX20_HDR_SOURCE_LOCATION
+#endif
 // Incomplete:
 #  define BOOST_NO_CXX20_HDR_RANGES