File eigen3-CastXML-support-for-aarch64.patch of Package eigen3

From 880fa43b2ba9c25f45ae3ad4871a6aabe558329f Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 16 Sep 2020 13:37:27 -0400
Subject: [PATCH] Add support for CastXML on ARM aarch64

CastXML simulates the preprocessors of other compilers, but actually
parses the translation unit with an internal Clang compiler.
Use the same `vld1q_u64` workaround that we do for Clang.

Fixes: #1979
---
 Eigen/src/Core/arch/NEON/Complex.h | 4 ++--
 Eigen/src/Core/util/Macros.h       | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

Index: eigen-3.3.8/Eigen/src/Core/arch/NEON/Complex.h
===================================================================
--- eigen-3.3.8.orig/Eigen/src/Core/arch/NEON/Complex.h
+++ eigen-3.3.8/Eigen/src/Core/arch/NEON/Complex.h
@@ -17,7 +17,7 @@ namespace internal {
 
 inline uint32x4_t p4ui_CONJ_XOR() {
 // See bug 1325, clang fails to call vld1q_u64.
-#if EIGEN_COMP_CLANG
+#if EIGEN_COMP_CLANG || EIGEN_COMP_CASTXML
   uint32x4_t ret = { 0x00000000, 0x80000000, 0x00000000, 0x80000000 };
   return ret;
 #else
@@ -291,7 +291,7 @@ ptranspose(PacketBlock<Packet2cf,2>& ker
 #if EIGEN_ARCH_ARM64 && !EIGEN_APPLE_DOUBLE_NEON_BUG
 
 // See bug 1325, clang fails to call vld1q_u64.
-#if EIGEN_COMP_CLANG
+#if EIGEN_COMP_CLANG || EIGEN_COMP_CASTXML
   static uint64x2_t p2ul_CONJ_XOR = {0x0, 0x8000000000000000};
 #else
   const uint64_t  p2ul_conj_XOR_DATA[] = { 0x0, 0x8000000000000000 };
Index: eigen-3.3.8/Eigen/src/Core/util/Macros.h
===================================================================
--- eigen-3.3.8.orig/Eigen/src/Core/util/Macros.h
+++ eigen-3.3.8/Eigen/src/Core/util/Macros.h
@@ -35,6 +35,12 @@
   #define EIGEN_COMP_CLANG 0
 #endif
 
+/// \internal EIGEN_COMP_CASTXML set to 1 if being preprocessed by CastXML
+#if defined(__castxml__)
+  #define EIGEN_COMP_CASTXML 1
+#else
+  #define EIGEN_COMP_CASTXML 0
+#endif
 
 /// \internal EIGEN_COMP_LLVM set to 1 if the compiler backend is llvm
 #if defined(__llvm__)