3 files changed, 15 insertions, 24 deletions
diff --git a/absl/base/exception_safety_testing_test.cc b/absl/base/exception_safety_testing_test.cc
index 575b535..a59be29 100644
--- a/absl/base/exception_safety_testing_test.cc
+++ b/absl/base/exception_safety_testing_test.cc
@@ -328,17 +328,15 @@ TEST(ThrowingValueTest, NonThrowingDelete) {
   UnsetCountdown();
 }
 
-using Storage =
-    absl::aligned_storage_t<sizeof(ThrowingValue<>), alignof(ThrowingValue<>)>;
-
 TEST(ThrowingValueTest, NonThrowingPlacementDelete) {
   constexpr int kArrayLen = 2;
   // We intentionally create extra space to store the tag allocated by placement
   // new[].
   constexpr int kStorageLen = 4;
 
-  Storage buf;
-  Storage array_buf[kStorageLen];
+  alignas(ThrowingValue<>) unsigned char buf[sizeof(ThrowingValue<>)];
+  alignas(ThrowingValue<>) unsigned char
+      array_buf[sizeof(ThrowingValue<>[kStorageLen])];
   auto* placed = new (&buf) ThrowingValue<>(1);
   auto placed_array = new (&array_buf) ThrowingValue<>[kArrayLen];
 
@@ -902,12 +900,12 @@ TEST(ConstructorTrackerTest, CreatedAfter) {
 }
 
 TEST(ConstructorTrackerTest, NotDestroyedAfter) {
-  absl::aligned_storage_t<sizeof(Tracked), alignof(Tracked)> storage;
+  alignas(Tracked) unsigned char storage[sizeof(Tracked)];
   EXPECT_NONFATAL_FAILURE(
       {
         exceptions_internal::ConstructorTracker ct(
             exceptions_internal::countdown);
-        new (&storage) Tracked;
+        new (&storage) Tracked();
       },
       "not destroyed");
 }
@@ -924,11 +922,11 @@ TEST(ConstructorTrackerTest, DestroyedTwice) {
 
 TEST(ConstructorTrackerTest, ConstructedTwice) {
   exceptions_internal::ConstructorTracker ct(exceptions_internal::countdown);
-  absl::aligned_storage_t<sizeof(Tracked), alignof(Tracked)> storage;
+  alignas(Tracked) unsigned char storage[sizeof(Tracked)];
   EXPECT_NONFATAL_FAILURE(
       {
-        new (&storage) Tracked;
-        new (&storage) Tracked;
+        new (&storage) Tracked();
+        new (&storage) Tracked();
         reinterpret_cast<Tracked*>(&storage)->~Tracked();
       },
       "re-constructed");
diff --git a/absl/base/internal/low_level_alloc.cc b/absl/base/internal/low_level_alloc.cc
index 225abc2..1bf9443 100644
--- a/absl/base/internal/low_level_alloc.cc
+++ b/absl/base/internal/low_level_alloc.cc
@@ -220,16 +220,17 @@ struct LowLevelAlloc::Arena {
 };
 
 namespace {
-using ArenaStorage = std::aligned_storage<sizeof(LowLevelAlloc::Arena),
-                                          alignof(LowLevelAlloc::Arena)>::type;
-
 // Static storage space for the lazily-constructed, default global arena
 // instances.  We require this space because the whole point of LowLevelAlloc
 // is to avoid relying on malloc/new.
-ArenaStorage default_arena_storage;
-ArenaStorage unhooked_arena_storage;
+alignas(LowLevelAlloc::Arena) unsigned char default_arena_storage[sizeof(
+    LowLevelAlloc::Arena)];
+alignas(LowLevelAlloc::Arena) unsigned char unhooked_arena_storage[sizeof(
+    LowLevelAlloc::Arena)];
 #ifndef ABSL_LOW_LEVEL_ALLOC_ASYNC_SIGNAL_SAFE_MISSING
-ArenaStorage unhooked_async_sig_safe_arena_storage;
+alignas(
+    LowLevelAlloc::Arena) unsigned char unhooked_async_sig_safe_arena_storage
+    [sizeof(LowLevelAlloc::Arena)];
 #endif
 
 // We must use LowLevelCallOnce here to construct the global arenas, rather than
diff --git a/absl/base/options.h b/absl/base/options.h
index 6868c77..234137c 100644
--- a/absl/base/options.h
+++ b/absl/base/options.h
@@ -123,14 +123,6 @@
 // compiler flags passed by the end user.  For more info, see
 // https://abseil.io/about/design/dropin-types.
 
-// A value of 2 means to detect the C++ version being used to compile Abseil,
-// and use an alias only if a working std::optional is available.  This option
-// should not be used when your program is not built from source -- for example,
-// if you are distributing Abseil in a binary package manager -- since in mode
-// 2, absl::optional will name a different template class, with a different
-// mangled name and binary layout, depending on the compiler flags passed by the
-// end user.
-//
 // User code should not inspect this macro.  To check in the preprocessor if
 // absl::optional is a typedef of std::optional, use the feature macro
 // ABSL_USES_STD_OPTIONAL.