From 140f85bb99125fbda8b68da5cd53c152c4f0d87e Mon Sep 17 00:00:00 2001
From: Pete Warden <pete@petewarden.com>
Date: Tue, 12 May 2015 16:03:43 -0700
Subject: [PATCH] Check for the macro __ARM_NEON__ (with two underscores at the
 end) as well as __ARM_NEON. The second macro is correct according to the ARM
 language extensions specification, but historically the first one has been
 more common. Some older compilers (e.g. gcc v4.6 on a Beaglebone Black) only
 define the first, so without this patch NEON isn't enabled.

---
 Eigen/Core | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Eigen/Core b/Eigen/Core
index 16007d0c9..8a261d167 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -178,7 +178,7 @@
     #undef bool
     #undef vector
     #undef pixel
-  #elif defined  __ARM_NEON
+  #elif (defined  __ARM_NEON) || (defined __ARM_NEON__)
     #define EIGEN_VECTORIZE
     #define EIGEN_VECTORIZE_NEON
     #include <arm_neon.h>