A head up to anyone trying to build GNU APL on macOS 27 Golden Gate with Xcode 27 or Command Line tools for Xcode 27.
It doesn't work. I'm trying to get a handle on what's going on, but evidently Apple made some change to Xcode and/or the C++ environment that is breaking GNU APL. Everything works fine under macOS 26. And if you try to run GNU APL that you built on macOS 26 after upgrading to macOS 27, it still works. Even something as simple as trying to display help via "apl --v" results in a seg fault. Trying to bring up APL normally prints the welcome banner, displays a couple of garbage characters, and then hangs instead of prompting for input. I'm suspecting that something in the way GNU APL is dealing with std input and output (or the C++ iostream llibraries) s incompatible with something that Apple changed in macOS 27 and/or the clang C++ environment that's present in the compilation system in Xcode 27. Any thoughts on how to debug this would be appreciated. I suspedt that Jürgen doesn't use macOS so us macOS users are probably going to have to help figure this out. If anyone else runs into this on macOS, please reach out and perhaps we can collaborate on getting to the bottom of what's wrong. - Paul
