From f84f27c366cc5028587efc1e34808f141ab77861 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Sat, 26 Mar 2016 19:09:44 +0000
Subject: [PATCH] Update for clang on Windows: Enables __int64 when available.
 Enables stdint.h when available. Enables log1p/expm1 when available. Enables
 char16_t and char32_t when available.

---
 include/boost/config/compiler/clang.hpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/boost/config/compiler/clang.hpp b/include/boost/config/compiler/clang.hpp
index 01355bb7..a1463a0d 100644
--- a/include/boost/config/compiler/clang.hpp
+++ b/include/boost/config/compiler/clang.hpp
@@ -39,10 +39,15 @@
 #  define BOOST_NO_TYPEID
 #endif
 
-#if defined(__int64) && !defined(__GNUC__)
+#if !__is_identifier(__int64) && !defined(__GNUC__)
 #  define BOOST_HAS_MS_INT64
 #endif
 
+#if __has_include(<stdint.h>)
+#  define BOOST_HAS_STDINT_H
+#endif
+
+
 #define BOOST_HAS_NRVO
 
 // Branch prediction hints
@@ -107,11 +112,16 @@
 //
 // Currently clang on Windows using VC++ RTL does not support C++11's char16_t or char32_t
 //
-#if defined(_MSC_VER) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
+#if (defined(_MSC_VER) && (_MSC_VER < 1900)) || !(defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L)
 #  define BOOST_NO_CXX11_CHAR16_T
 #  define BOOST_NO_CXX11_CHAR32_T
 #endif
 
+#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(__GNUC__)
+#define BOOST_HAS_EXPM1
+#define BOOST_HAS_LOG1P
+#endif
+
 #if !__has_feature(cxx_constexpr)
 #  define BOOST_NO_CXX11_CONSTEXPR
 #endif