commit a923345c72aef9ebb6b32f81f4825acc11085803
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Jan 17 09:42:35 2022

    libstdc++: Add 'typename' to dependent types in atomic<shared_ptr<T>>
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/shared_ptr_atomic.h (_Sp_atomic): Add typename
            to qualified-id for dependent type.

diff --git a/libstdc++-v3/include/bits/shared_ptr_atomic.h b/libstdc++-v3/include/bits/shared_ptr_atomic.h
index 900499bae32..50aa46370ca 100644
--- a/libstdc++-v3/include/bits/shared_ptr_atomic.h
+++ b/libstdc++-v3/include/bits/shared_ptr_atomic.h
@@ -456,8 +456,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       typename _Tp::element_type* _M_ptr;
       _Atomic_count _M_refcount;
 
-      static _Atomic_count::pointer
-      _S_add_ref(_Atomic_count::pointer __p)
+      static typename _Atomic_count::pointer
+      _S_add_ref(typename _Atomic_count::pointer __p)
       {
 	if (__p)
 	  {