[libcxx-commits] [libcxx] Unconditionally lower std::string's alignment requirement from 16 to 8. (PR #68925)

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

I see an ABI break being mentioned in the commit message, as being noted and agreed to be acceptable. I'm interested to hear about all the aspects of ABI break that was considered and deemed acceptable. In particular, won't this also break the layout of user's data structures? If I have e.g. `struct { char c; std::string str; }`, this struct will now have a different layout after this change, effectively breaking the ABI of potentially any struct/class that embeds a string?

https://github.com/llvm/llvm-project/pull/68925