From a7209fad70281a94ef923b1ded10ee687accaccc Mon Sep 17 00:00:00 2001
From: Yu You <youyu3@gmail.com>
Date: Sat, 13 Dec 2025 17:00:12 -0800
Subject: [PATCH] GemmKernel: Define static constexpr member variables
 out-of-class for C++14 compatibility

libeigen/eigen!2091
---
 Eigen/src/Core/arch/AVX512/GemmKernel.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Eigen/src/Core/arch/AVX512/GemmKernel.h b/Eigen/src/Core/arch/AVX512/GemmKernel.h
index 96157f471..b37b6ed6b 100644
--- a/Eigen/src/Core/arch/AVX512/GemmKernel.h
+++ b/Eigen/src/Core/arch/AVX512/GemmKernel.h
@@ -929,6 +929,15 @@ class gemm_class {
   }
 };
 
+template <typename Scalar, bool is_unit_inc>
+const int gemm_class<Scalar, is_unit_inc>::a_regs[];
+
+template <typename Scalar, bool is_unit_inc>
+const int gemm_class<Scalar, is_unit_inc>::b_regs[];
+
+template <typename Scalar, bool is_unit_inc>
+const int gemm_class<Scalar, is_unit_inc>::c_regs[];
+
 // Compute kernel with max unroll support of:
 //   Single precision:
 //     max_a_unroll: 48, 32, 16, 8, 4, 2, 1