From fd2a10c27ca8eaa8adbe632091d3356bec06ca9e Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Mon, 12 Oct 2020 17:58:27 +0100
Subject: [PATCH] Add web assembly support (emscripten/wasm).

---
 .../config/detail/select_platform_config.hpp    |  5 +++++
 include/boost/config/platform/wasm.hpp          | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 include/boost/config/platform/wasm.hpp

diff --git a/include/boost/config/detail/select_platform_config.hpp b/include/boost/config/detail/select_platform_config.hpp
index b36eca57..dbff74aa 100644
--- a/include/boost/config/detail/select_platform_config.hpp
+++ b/include/boost/config/detail/select_platform_config.hpp
@@ -88,6 +88,11 @@
 #elif defined(__CloudABI__)
 // Nuxi CloudABI:
 #  define BOOST_PLATFORM_CONFIG "boost/config/platform/cloudabi.hpp"
+
+#elif defined (__wasm__)
+// Web assembly:
+#  define BOOST_PLATFORM_CONFIG "boost/config/platform/wasm.hpp"
+
 #else
 
 #  if defined(unix) \
diff --git a/include/boost/config/platform/wasm.hpp b/include/boost/config/platform/wasm.hpp
new file mode 100644
index 00000000..c307812d
--- /dev/null
+++ b/include/boost/config/platform/wasm.hpp
@@ -0,0 +1,17 @@
+//  (C) Copyright John Maddock 2020.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org for most recent version.
+
+//  WASM specific config options:
+
+#define BOOST_PLATFORM "Wasm"
+
+// boilerplate code:
+#include <boost/config/detail/posix_features.hpp>
+//
+// fenv lacks the C++11 macros:
+//
+#define BOOST_NO_FENV_H