From 587fd6ab707b0743f48593e401eb546d709eca4d Mon Sep 17 00:00:00 2001
From: Antonio Sanchez <cantonios@google.com>
Date: Mon, 11 Jan 2021 09:15:45 -0800
Subject: [PATCH] Only specialize complex `sqrt_impl` for CUDA if not MSVC.

We already specialize `sqrt_impl` on windows due to MSVC's mishandling
of `inf` (!355).
---
 Eigen/src/Core/arch/CUDA/Complex.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Eigen/src/Core/arch/CUDA/Complex.h b/Eigen/src/Core/arch/CUDA/Complex.h
index ab0207cac..df5a3c2a4 100644
--- a/Eigen/src/Core/arch/CUDA/Complex.h
+++ b/Eigen/src/Core/arch/CUDA/Complex.h
@@ -94,6 +94,8 @@ template<typename T> struct scalar_quotient_op<const std::complex<T>, const std:
 
 template<typename T> struct scalar_quotient_op<std::complex<T>, std::complex<T> > : scalar_quotient_op<const std::complex<T>, const std::complex<T> > {};
 
+// Complex sqrt is already specialized on Windows.
+#if EIGEN_COMP_MSVC == 0
 template<typename T>
 struct sqrt_impl<std::complex<T> >
 {
@@ -103,6 +105,7 @@ struct sqrt_impl<std::complex<T> >
     return complex_sqrt<T>(x);
   }
 };
+#endif
 
 }  // namespace internal
 }  // namespace Eigen