Issue 81652
Summary Use `HIDE_FROM_ABI` in the dylib
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Reporter mordante
                  I think this should be `HIDE_FROM_ABI`. Otherwise, we'll have potential ODR violations when mixing different versions of libc++ via static archives. This seems to be a widespread pre-existing problem in the library after a quick survey.

This would force you to define it in the header because `HIDE_FROM_ABI` is `ALWAYS_INLINE` on GCC. I think it would be acceptable to ignore this issue until we've cleaned that up, since I feel like this is a very deep can of worms to open.

_Originally posted by @ldionne in https://github.com/llvm/llvm-project/pull/74928#discussion_r1488330937_
 
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