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According to Section 2.6.2 of RFC 3927, 169.254.255.255 is the broadcast address for the Link-Local prefix. This does not seem to work in macOS; what I see in WireShark are ARP messages "Who has 169.254.255.255?". Which obviously doesn't work. I'm on macOS 12.4 / Xcode 13.4. Same code works fine in Linux (Ubuntu 20.04). Anybody have any ideas?

I was trying to track down a linkage issue, and found no way of knowing whether a symbol in a library had a visibility attribute of "hidden" or "default". Both nm and objdump merrily listed all symbols, regardless of their visibility attribute. While trawling the web, I found one post showing a gcc objdump output that explicitly said "hidden", and someone else claiming that hidden symbols disappeared from their llvm-nm output. What's the deal with the Xcode tools? I'm running Xcode 10.2.1. Thanks in advance!