[libcxx-commits] [libcxx] [libc++] Optimize standard streams with sync_with_stdio(false) (PR #209161)

[Louis Dionne via libcxx-commits]

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@@ -12,6 +12,23 @@ To generate a summary, re-generate the new ABI list using the
 
 New entries should be added directly below the "Version" header.
 
+------------
+Version 24.0
+------------
+
+* [libc++] Optimize standard streams with sync_with_stdio(false)
+
+  This updates the standard streams so that the buffers are replaced with `basic_filebuf`s.
+
+  Fixes #21566
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ldionne wrote:

```suggestion
```

Since we're just adding symbols, the justification why it's fine is obvious.

https://github.com/llvm/llvm-project/pull/209161