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We don't actually update the ABI lists at every release -- it's too much work, since we'd technically have to do it even for minor releases. Furthermore, I don't think anybody uses those (I certainly don't rely on them for anything). Instead, it is better to rely on the ABI list changelog and the canonical ABI list that we always keep up to date. If one wants to know what symbols were shipped in a specific release, that can be discovered easily using Git, which is a superior tool than keeping textual copies of old versions.
This directory contains abi lists representing the symbols exported by the libc++ library. The lists are generated using libcxx/utils/generate_abi_list.py. Every time a symbol is added or removed from the libc++ library, each of the lists *MUST* be updated to reflect the changes. This can be done by using the `generate-cxx-abilist` CMake target. We do not keep an up-to-date ABI list for all the build configurations of libc++. Currently, only the default configuration on MacOS and Linux are supported.