[libcxx-commits] [libcxx] [libc++] Use a custom once_flag implementation for locale::id::__get() (PR #212235)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions ,cpp,h -- libcxx/include/__configuration/abi.h libcxx/include/__locale libcxx/src/locale.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/libcxx/include/__locale b/libcxx/include/__locale
index c04320a06..5f1e6a968 100644
--- a/libcxx/include/__locale
+++ b/libcxx/include/__locale
@@ -168,9 +168,9 @@ class _LIBCPP_EXPORTED_FROM_ABI locale::id {
 
   __id_type __id_ = 0;
 
-#ifndef _LIBCPP_ABI_COMPACT_LOCALE_ID
+#  ifndef _LIBCPP_ABI_COMPACT_LOCALE_ID
   [[__maybe_unused__]] int32_t __dummy_ = 0;
-#endif
+#  endif
 
 public:
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR id() = default;
diff --git a/libcxx/src/locale.cpp b/libcxx/src/locale.cpp
index deb1ebe59..1c74d826b 100644
--- a/libcxx/src/locale.cpp
+++ b/libcxx/src/locale.cpp
@@ -574,9 +574,9 @@ long locale::id::__get() {
     return val - first_id;
 
   if (val == uninitialized && __libcpp_atomic_compare_exchange(&__id_, &val, pending)) {
-      auto new_id = __libcpp_atomic_add(&next_id, 1) - 1;
-      __libcpp_atomic_store(&__id_, new_id);
-      return new_id - first_id;
+    auto new_id = __libcpp_atomic_add(&next_id, 1) - 1;
+    __libcpp_atomic_store(&__id_, new_id);
+    return new_id - first_id;
   }
 
   // Another thread is already initializing __id_. Wait for that in a spin loop. The initialization should be incredibly

``````````

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https://github.com/llvm/llvm-project/pull/212235