Fix StlDeque for GCC 10

StlDeque extends std::deque by accessing some of its internal members.
Since GCC 10 these are not accessible anymore.

1 files changed, 4 insertions, 2 deletions

diff --git a/Eigen/src/StlSupport/StdDeque.h b/Eigen/src/StlSupport/StdDeque.h
index 045da7b4d..006ac1164 100644
--- a/Eigen/src/StlSupport/StdDeque.h
+++ b/Eigen/src/StlSupport/StdDeque.h
@@ -98,8 +98,10 @@ namespace std {
   { return deque_base::insert(position,x); }
   void insert(const_iterator position, size_type new_size, const value_type& x)
   { deque_base::insert(position, new_size, x); }
-#elif defined(_GLIBCXX_DEQUE) && EIGEN_GNUC_AT_LEAST(4,2)
+#elif defined(_GLIBCXX_DEQUE) && EIGEN_GNUC_AT_LEAST(4,2) && !EIGEN_GNUC_AT_LEAST(10, 1)
   // workaround GCC std::deque implementation
+  // GCC 10.1 doesn't let us access _Deque_impl _M_impl anymore and we have to
+  // fall-back to the default case
   void resize(size_type new_size, const value_type& x)
   {
     if (new_size < deque_base::size())
@@ -108,7 +110,7 @@ namespace std {
       deque_base::insert(deque_base::end(), new_size - deque_base::size(), x);
   }
 #else
-  // either GCC 4.1 or non-GCC
+  // either non-GCC or GCC between 4.1 and 10.1
   // default implementation which should always work.
   void resize(size_type new_size, const value_type& x)
   {