This isn't technically necessary according to the DWARF standard, but the Android libunwindstack rejects eh_frame sections where an FDE refers to a CIE other than the closest previous CIE.
I think I would consider this a bug in libunwindstack... as far as I can tell, the DWARF standard doesn't contain any requirement like this. And
I'm not sure we should be adding workarounds for specific unwind implementations. But I have the patch anyway, so I'm posting it.
I'd appreciate it if someone from Google could contact the owners of libstackunwind to see if they have any opinion on this.