From e559701981c1b656a3d1c9e693b6cdc28becfc10 Mon Sep 17 00:00:00 2001
From: Antonio Sanchez <cantonios@google.com>
Date: Thu, 28 Oct 2021 08:23:19 -0700
Subject: [PATCH] Fix compile issue for gcc 4.8

---
 Eigen/src/Core/arch/Default/BFloat16.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Eigen/src/Core/arch/Default/BFloat16.h b/Eigen/src/Core/arch/Default/BFloat16.h
index d0666effa..eb8d40aee 100644
--- a/Eigen/src/Core/arch/Default/BFloat16.h
+++ b/Eigen/src/Core/arch/Default/BFloat16.h
@@ -46,12 +46,13 @@ namespace Eigen {
 
 struct bfloat16;
 
+namespace numext {
 template <>
-EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC Eigen::bfloat16 numext::bit_cast<Eigen::bfloat16, uint16_t>(const uint16_t& src);
+EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC Eigen::bfloat16 bit_cast<Eigen::bfloat16, uint16_t>(const uint16_t& src);
 
 template <>
-EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC uint16_t numext::bit_cast<uint16_t, Eigen::bfloat16>(const Eigen::bfloat16& src);
-
+EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC uint16_t bit_cast<uint16_t, Eigen::bfloat16>(const Eigen::bfloat16& src);
+}  // namespace numext
 namespace bfloat16_impl {
 
 #if defined(EIGEN_USE_HIP_BF16)