From 6f0c359a4e2e5fcfad4cf9af9524b53122fdb494 Mon Sep 17 00:00:00 2001
From: Andrey Semashev <Lastique@users.noreply.github.com>
Date: Sun, 11 Dec 2016 16:45:12 +0400
Subject: [PATCH] Disable C++14 constexpr for Intel compiler

Intel compiler up to version 17.0 (on Linux) makes constexpr member functions implicitly const-qualified.
---
 include/boost/config/compiler/intel.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/boost/config/compiler/intel.hpp b/include/boost/config/compiler/intel.hpp
index 80969e9e..fad1a5aa 100644
--- a/include/boost/config/compiler/intel.hpp
+++ b/include/boost/config/compiler/intel.hpp
@@ -496,6 +496,11 @@ template<> struct assert_intrinsic_wchar_t<unsigned short> {};
 #  define BOOST_NO_CXX11_HDR_TUPLE
 #endif
 
+// Broken in all versions up to 17:
+#if !defined(BOOST_NO_CXX14_CONSTEXPR)
+#define BOOST_NO_CXX14_CONSTEXPR
+#endif
+
 #if (BOOST_INTEL_CXX_VERSION < 1200)
 //
 // fenv.h appears not to work with Intel prior to 12.0: