compnerd added a comment. While I can see the argument you raise, the saving grace here is that this is buried in libc++abi. The only real piece of libc++abi of real use to users is `__cxa_demangle` (which is only relevant for Windows, and Darwin where you have two level namespaces). For everyone else, libc++abi is merely an implementation detail for libc++ and will not be linked to directly. If you are mixing and matching the ABI support interfaces, or the runtime, you are already in a pretty bad shape, and allowing things to break in such a circumstances doesn't seem entirely terrible. Unfortunately, for compatibility with GCC, we do need to maintain this alignment, which is not guaranteed without this patch.
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