[libcxx-commits] [libcxx] [libc++] Add visibility annotations to the std namespace with GCC (PR #133233)

[Louis Dionne via libcxx-commits]

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@@ -60,6 +60,10 @@ Improvements and New Features
 
 - Updated formatting library to Unicode 16.0.0.
 
+- When using GCC, the ``std`` namespace is now annotated with ``[[gnu::visibility("default")]]``. This may cause changes
+  in the symbols exported from shared libraries when building with ``-fvisibility=hidden``. This also fixes RTTI
+  comparison between shared libraries, since all RTTI has the correct visibility now.
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ldionne wrote:

```suggestion
  comparison between shared libraries, since all RTTI has the correct visibility now. There is no behavior change on Clang.
```

https://github.com/llvm/llvm-project/pull/133233