From 0c845e28c918c4df8770aba213f1ae994b6b13df Mon Sep 17 00:00:00 2001
From: Eugene Zhulenev <ezhulenev@google.com>
Date: Wed, 25 Sep 2019 11:31:45 -0700
Subject: Fix erf in c++03

---
 Eigen/src/Core/MathFunctions.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Eigen/src/Core/MathFunctions.h')

diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 0d50fcd52..950ebec43 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -1579,12 +1579,18 @@ template<> EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
 double tanh(const double &x) { return ::tanh(x); }
 #endif
 
+#if EIGEN_HAS_CXX11
 template<typename T>
 EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
 T erf(const T &x) {
   EIGEN_USING_STD_MATH(erf);
   return erf(x);
 }
+#else
+template<typename T>
+EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
+T erf(const T& x);
+#endif
 
 #if (!defined(EIGEN_GPUCC)) && EIGEN_FAST_MATH && !defined(SYCL_DEVICE_ONLY)
 EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
-- 
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