gcore should warn the user if CTF was requested, but could not be produced
If your coreadm contents is set to default and you run gcore on a system
without /usr/lib[/64]/libz.so, the resulting core file will not have any
CTF data, even if the process's objects had CTF data. gcore should warn
the user that this happened, and why.
This happens on Nexenta elatte alpha6pre1, since it installs libz.so.1
and not libz.so.