On 23 Nov 2025 00:30, Thiago Macieira via Std-Proposals wrote:
>
> ABI is currently not part of the Standard.

This is not entirely true. I'm sure you know that proposals and design
decisions are evaluated with ABI stability in mind, and sometimes
otherwise valid proposals are rejected (or not written in the first
place) because they would break ABI.

Just an example of this that I recently came upon:

https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2094

And this isn't just about the Standard, this affects implementations as
well, and to even stronger degree.