Not sure what you’re trying to show with that bug report but it’s not a case of cross distro glibc issues. If I read correctly it’s a vanilla behavioral change that exposed preexisting UB in flash.

Not sure how the comments about alpine or bionic relate either to my claim that cross distro glibc is fine.

It depends on how we define the ABI. I see it as a set of client-visible invariants that they rely on. In my world, glibc changed the client's visible invariants, breaking the client. The client works on one glibc-based host, but not on another. What is this if not "a case of cross-distro glibc issues?"

Overall, both of our points of view on compatibility were discussed well in that thread; we probably shouldn't repeat ourselves. :)