rjmccall added a comment. It's certainly possible that other targets will want to support multiple C++ ABIs in the future, but it's okay for us to design things around the situation we've got today. A lot of these "ABIs" are just target-specific variants; if it simplifies code to just make ABI queries just be target queries instead of abstracting the target C++ ABI, and the resulting burden on targets with multiple supported ABIs is very small, that seems like an acceptable trade-off. If things change and we get a lot of targets asking to support multiple ABIs, there's no reason we can't revisit this decision.
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