[libcxx-commits] [libcxx] [libc++] Make std::pair trivially copyable if its members are (PR #89652)

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EricWF wrote:

> @EricWF This is a pre-existing problem. `_LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI` and `_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI` do the same thing, so I don't think this should be blocking for this PR. We basically don't support the unstable ABI and GCC currently.

@ldionne  Were you aware of that?

Then we should make it an explicit error, rather than silently giving the users ABI breaks. The ABI of a type should include _no logic_.


https://github.com/llvm/llvm-project/pull/89652