[gcc r12-10234] libstdc++: Fix some -Wmismatched-tags warnings

[gcc r12-10234] libstdc++: Fix some -Wmismatched-tags warnings

[Jonathan Wakely]

https://gcc.gnu.org/g:fe1c4d6cce6a35c0800f26d87c411a34cb9472bb

commit r12-10234-gfe1c4d6cce6a35c0800f26d87c411a34cb9472bb
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Aug 8 22:07:29 2023 +0100

    libstdc++: Fix some -Wmismatched-tags warnings
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/shared_ptr_atomic.h (atomic): Change class-head
            to struct.
            * include/bits/stl_tree.h (_Rb_tree_merge_helper): Change
            class-head to struct in friend declaration.
            * include/std/future (_Task_state_base, _Task_state): Likewise.
            * include/std/scoped_allocator (__inner_type_impl): Likewise.
            * include/std/valarray (_BinClos, _SClos, _GClos, _IClos)
            (_ValFunClos, _RefFunClos): Change class-head to struct.
    
    (cherry picked from commit 5b46eacc4949ec62ee718b172cf8eb056ff27654)

Diff:
---
 libstdc++-v3/include/bits/shared_ptr_atomic.h |  8 ++++----
 libstdc++-v3/include/bits/stl_tree.h          |  2 +-
 libstdc++-v3/include/std/future               |  4 ++--
 libstdc++-v3/include/std/scoped_allocator     |  4 ++--
 libstdc++-v3/include/std/valarray             | 12 ++++++------
 5 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/libstdc++-v3/include/bits/shared_ptr_atomic.h b/libstdc++-v3/include/bits/shared_ptr_atomic.h
index 94570cd3ab3..e903fe89424 100644
--- a/libstdc++-v3/include/bits/shared_ptr_atomic.h
+++ b/libstdc++-v3/include/bits/shared_ptr_atomic.h
@@ -356,7 +356,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 #if __cplusplus >= 202002L
 # define __cpp_lib_atomic_shared_ptr 201711L
   template<typename _Tp>
-    class atomic;
+    struct atomic;
 
   template<typename _Up>
     static constexpr bool __is_shared_ptr = false;
@@ -368,7 +368,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       using value_type = _Tp;
 
-      friend class atomic<_Tp>;
+      friend struct atomic<_Tp>;
 
       // An atomic version of __shared_count<> and __weak_count<>.
       // Stores a _Sp_counted_base<>* but uses the LSB as a lock.
@@ -602,7 +602,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     };
 
   template<typename _Tp>
-    class atomic<shared_ptr<_Tp>>
+    struct atomic<shared_ptr<_Tp>>
     {
     public:
       using value_type = shared_ptr<_Tp>;
@@ -725,7 +725,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     };
 
   template<typename _Tp>
-    class atomic<weak_ptr<_Tp>>
+    struct atomic<weak_ptr<_Tp>>
     {
     public:
       using value_type = weak_ptr<_Tp>;
diff --git a/libstdc++-v3/include/bits/stl_tree.h b/libstdc++-v3/include/bits/stl_tree.h
index 7a352c17b22..6ced03252bc 100644
--- a/libstdc++-v3/include/bits/stl_tree.h
+++ b/libstdc++-v3/include/bits/stl_tree.h
@@ -1555,7 +1555,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	  = _Rb_tree<_Key, _Val, _KeyOfValue, _Compare2, _Alloc>;
 
       template<typename, typename>
-	friend class _Rb_tree_merge_helper;
+	friend struct _Rb_tree_merge_helper;
 
       /// Merge from a compatible container into one with unique keys.
       template<typename _Compare2>
diff --git a/libstdc++-v3/include/std/future b/libstdc++-v3/include/std/future
index a1b2d7f1d3a..f1fa16c8649 100644
--- a/libstdc++-v3/include/std/future
+++ b/libstdc++-v3/include/std/future
@@ -623,10 +623,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       class _Async_state_impl;
 
     template<typename _Signature>
-      class _Task_state_base;
+      struct _Task_state_base;
 
     template<typename _Fn, typename _Alloc, typename _Signature>
-      class _Task_state;
+      struct _Task_state;
 
     template<typename _Res_ptr, typename _Fn,
 	     typename _Res = typename _Res_ptr::element_type::result_type>
diff --git a/libstdc++-v3/include/std/scoped_allocator b/libstdc++-v3/include/std/scoped_allocator
index f2e3ed9f783..8ad4c90b694 100644
--- a/libstdc++-v3/include/std/scoped_allocator
+++ b/libstdc++-v3/include/std/scoped_allocator
@@ -165,7 +165,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       { return _M_inner == __other._M_inner; }
 
     private:
-      template<typename...> friend class __inner_type_impl;
+      template<typename...> friend struct __inner_type_impl;
       template<typename, typename...> friend class scoped_allocator_adaptor;
 
       __type _M_inner;
@@ -187,7 +187,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
         friend class scoped_allocator_adaptor;
 
       template<typename...>
-        friend class __inner_type_impl;
+	friend struct __inner_type_impl;
 
       tuple<const _OuterAlloc&, const _InnerAllocs&...>
       _M_tie() const noexcept
diff --git a/libstdc++-v3/include/std/valarray b/libstdc++-v3/include/std/valarray
index 6f800d1b367..32e6e7e8a76 100644
--- a/libstdc++-v3/include/std/valarray
+++ b/libstdc++-v3/include/std/valarray
@@ -60,22 +60,22 @@ namespace __detail
         template<class, class> class _Meta1,
         template<class, class> class _Meta2,
         class _Dom1, class _Dom2>
-    class _BinClos;
+    struct _BinClos;
 
   template<template<class, class> class _Meta, class _Dom>
-    class _SClos;
+    struct _SClos;
 
   template<template<class, class> class _Meta, class _Dom>
-    class _GClos;
+    struct _GClos;
 
   template<template<class, class> class _Meta, class _Dom>
-    class _IClos;
+    struct _IClos;
 
   template<template<class, class> class _Meta, class _Dom>
-    class _ValFunClos;
+    struct _ValFunClos;
 
   template<template<class, class> class _Meta, class _Dom>
-    class _RefFunClos;
+    struct _RefFunClos;
 } // namespace __detail
 
   using __detail::_UnClos;