From 613971a370d2b25d1ceffd26271b8818cca3beff Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Thu, 12 Jul 2018 10:46:53 +0100
Subject: [PATCH] CUDA: Make function scope statics constexpr under CUDA.

---
 include/boost/math/tools/config.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/boost/math/tools/config.hpp b/include/boost/math/tools/config.hpp
index 0a8363379..3ce6b7065 100644
--- a/include/boost/math/tools/config.hpp
+++ b/include/boost/math/tools/config.hpp
@@ -267,8 +267,10 @@
 //
 // function scope static variables aren't allowed on CUDA device code:
 //
-#ifdef __CUDA_ARCH__
+#if defined(__CUDA_ARCH__) && defined(BOOST_NO_CXX11_CONSTEXPR)
 #define BOOST_MATH_GPU_STATIC
+#elif defined(__CUDA_ARCH__)
+#define BOOST_MATH_GPU_STATIC constexpr
 #else
 #define BOOST_MATH_GPU_STATIC static
 #endif