Hmm, I guess I must have missed some important flag or environment variable when trying to reproduce it, sorry.
Given that IBM describes xlc as "legacy" (replaced by xlclang, but still supported for some unspecified period of time for the benefit of people who need C++ ABI compatibility with old code), I wonder how long we plan to support it... Anecdotally, from a time 1-2 decades ago when I used AIX daily, I can report that vast amounts of open source stuff couldn't build with xlc, so gcc was used for pretty much anything that didn't have a C++ ABI requirement. I kinda wonder if a single person in the entire world appreciates that we support this.
