libstdc++: Fix testsuite warnings about new C++23 deprecations

With the recent change to deprecate std::aligned_storage and
std::aligned_union we need to adjust some tests that now fail with
-std=c++23.

libstdc++-v3/ChangeLog:

	* include/std/type_traits: Add diagnostic pragmas around
	references to deprecated std::aligned_storage and
	std::aligned_union traits.
	* testsuite/20_util/aligned_storage/requirements/alias_decl.cc:
	Add dg-warning for et c++23.
	* testsuite/20_util/aligned_storage/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/aligned_storage/value.cc: Likewise.
	* testsuite/20_util/aligned_union/1.cc: Likewise.
	* testsuite/20_util/aligned_union/requirements/alias_decl.cc:
	Likewise.

6 files changed, 20 insertions, 0 deletions

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index d13af43..2bd607a 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2123,6 +2123,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
     };
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+
   /**
    *  @brief Provide aligned storage for types.
    *
@@ -2155,6 +2158,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template <size_t _Len, typename... _Types>
     const size_t aligned_union<_Len, _Types...>::alignment_value;
+#pragma GCC diagnostic pop
 
   /// @cond undocumented
 
@@ -2586,6 +2590,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { } _GLIBCXX17_DEPRECATED_SUGGEST("std::invoke_result");
 
 #if __cplusplus >= 201402L
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
   /// Alias template for aligned_storage
   template<size_t _Len, size_t _Align =
 	    __alignof__(typename __aligned_storage_msa<_Len>::__type)>
@@ -2593,6 +2599,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
   template <size_t _Len, typename... _Types>
     using aligned_union_t _GLIBCXX23_DEPRECATED = typename aligned_union<_Len, _Types...>::type;
+#pragma GCC diagnostic pop
 
   /// Alias template for decay
   template<typename _Tp>
diff --git a/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/alias_decl.cc b/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/alias_decl.cc
index fc230b6..2e8e90e 100644
--- a/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/alias_decl.cc
+++ b/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/alias_decl.cc
@@ -26,3 +26,6 @@ using namespace std;
 static_assert (is_same<typename aligned_storage<4>::type,
 	               aligned_storage_t<4>>(),
                "aligned_storage_t" );
+
+// { dg-warning "deprecated" "" { target c++23 } 26 }
+// { dg-warning "deprecated" "" { target c++23 } 27 }
diff --git a/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/explicit_instantiation.cc b/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/explicit_instantiation.cc
index 36dfe04..baec666 100644
--- a/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/explicit_instantiation.cc
+++ b/libstdc++-v3/testsuite/20_util/aligned_storage/requirements/explicit_instantiation.cc
@@ -29,3 +29,6 @@ namespace std
   template struct aligned_storage<1, alignment_of<test_type>::value>;
   template struct aligned_storage<2>;
 }
+
+// { dg-warning "deprecated" "" { target c++23 } 29 }
+// { dg-warning "deprecated" "" { target c++23 } 30 }
diff --git a/libstdc++-v3/testsuite/20_util/aligned_storage/value.cc b/libstdc++-v3/testsuite/20_util/aligned_storage/value.cc
index 16a5580..6e9df7f 100644
--- a/libstdc++-v3/testsuite/20_util/aligned_storage/value.cc
+++ b/libstdc++-v3/testsuite/20_util/aligned_storage/value.cc
@@ -59,3 +59,5 @@ void test01()
   static_assert(sizeof(aligned_storage<5>::type) >= 5, "");
   static_assert(__alignof__(aligned_storage<5>::type) == align_msa, "");
 }
+
+// { dg-warning "deprecated" "" { target c++23 } 0 }
diff --git a/libstdc++-v3/testsuite/20_util/aligned_union/1.cc b/libstdc++-v3/testsuite/20_util/aligned_union/1.cc
index b779884..7501529 100644
--- a/libstdc++-v3/testsuite/20_util/aligned_union/1.cc
+++ b/libstdc++-v3/testsuite/20_util/aligned_union/1.cc
@@ -64,6 +64,8 @@ void test01()
   static_assert(sizeof(au_type2::type) >= max_s+100,
                 "Storage size (at least len)");
 }
+// { dg-warning "deprecated" "" { target c++23 } 57 }
+// { dg-warning "deprecated" "" { target c++23 } 62 }
 
 int main()
 {
diff --git a/libstdc++-v3/testsuite/20_util/aligned_union/requirements/alias_decl.cc b/libstdc++-v3/testsuite/20_util/aligned_union/requirements/alias_decl.cc
index 6790d2a..41f2b08 100644
--- a/libstdc++-v3/testsuite/20_util/aligned_union/requirements/alias_decl.cc
+++ b/libstdc++-v3/testsuite/20_util/aligned_union/requirements/alias_decl.cc
@@ -26,3 +26,6 @@ using namespace std;
 static_assert (is_same<typename aligned_union<0, char, int>::type,
 	               aligned_union_t<0, char, int>>(),
                "aligned_union_t" );
+
+// { dg-warning "deprecated" "" { target c++23 } 26 }
+// { dg-warning "deprecated" "" { target c++23 } 27 }