From 807e51528d220c0efed870f0505dea81a5776085 Mon Sep 17 00:00:00 2001
From: acxz <5379597-acxz@users.noreply.gitlab.com>
Date: Mon, 12 Oct 2020 20:24:15 -0400
Subject: undefine EIGEN_CONSTEXPR before redefinition

---
 Eigen/src/Core/arch/Default/Half.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Eigen/src/Core/arch/Default/Half.h b/Eigen/src/Core/arch/Default/Half.h
index e4c3eefac..95ff9da17 100644
--- a/Eigen/src/Core/arch/Default/Half.h
+++ b/Eigen/src/Core/arch/Default/Half.h
@@ -53,6 +53,7 @@
 // GPU support. Hence the need to disable EIGEN_CONSTEXPR when building
 // Eigen with GPU support
   #pragma push_macro("EIGEN_CONSTEXPR")
+  #undef EIGEN_CONSTEXPR
   #define EIGEN_CONSTEXPR
 #endif
 
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