From fe8cd812b05e910000bd31ab7c9b9ddfbbfa12fa Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 22 Mar 2019 10:16:08 +0100
Subject: [PATCH] backport EIGEN_HAS_C99_MATH for MSVC

---
 Eigen/src/Core/util/Macros.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index 7d77739fc..ac0d43815 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -380,7 +380,8 @@
 #if EIGEN_MAX_CPP_VER>=11 && \
     ((defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901))       \
   || (defined(__GNUC__) && defined(_GLIBCXX_USE_C99)) \
-  || (defined(_LIBCPP_VERSION) && !defined(_MSC_VER)))
+  || (defined(_LIBCPP_VERSION) && !defined(_MSC_VER)) \
+  || (EIGEN_COMP_MSVC >= 1900) )
   #define EIGEN_HAS_C99_MATH 1
 #else
   #define EIGEN_HAS_C99_MATH 0