From b3c4344a6852e55c849976dd46ec4e861399bf16 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 7 Feb 2019 15:21:35 +0100
Subject: bug #1676: workaround GCC's bug in c++17 mode.

---
 Eigen/src/Core/DenseBase.h                | 4 ++--
 Eigen/src/Core/util/ForwardDeclarations.h | 6 +-----
 2 files changed, 3 insertions(+), 7 deletions(-)

(limited to 'Eigen/src/Core')

diff --git a/Eigen/src/Core/DenseBase.h b/Eigen/src/Core/DenseBase.h
index 65ec1f54b..406e66013 100644
--- a/Eigen/src/Core/DenseBase.h
+++ b/Eigen/src/Core/DenseBase.h
@@ -40,7 +40,7 @@ static inline void check_DenseIndex_is_signed() {
   */
 template<typename Derived> class DenseBase
 #ifndef EIGEN_PARSED_BY_DOXYGEN
-  : public DenseCoeffsBase<Derived>
+  : public DenseCoeffsBase<Derived, internal::accessors_level<Derived>::value>
 #else
   : public DenseCoeffsBase<Derived,DirectWriteAccessors>
 #endif // not EIGEN_PARSED_BY_DOXYGEN
@@ -71,7 +71,7 @@ template<typename Derived> class DenseBase
     typedef Scalar value_type;
     
     typedef typename NumTraits<Scalar>::Real RealScalar;
-    typedef DenseCoeffsBase<Derived> Base;
+    typedef DenseCoeffsBase<Derived, internal::accessors_level<Derived>::value> Base;
 
     using Base::derived;
     using Base::const_cast_derived;
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 5d86a51ac..050d15e96 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -47,11 +47,7 @@ template<typename T> struct NumTraits;
 template<typename Derived> struct EigenBase;
 template<typename Derived> class DenseBase;
 template<typename Derived> class PlainObjectBase;
-
-
-template<typename Derived,
-         int Level = internal::accessors_level<Derived>::value >
-class DenseCoeffsBase;
+template<typename Derived, int Level> class DenseCoeffsBase;
 
 template<typename _Scalar, int _Rows, int _Cols,
          int _Options = AutoAlign |
-- 
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