https://bugzilla.novell.com/show_bug.cgi?id=727360
https://bugzilla.novell.com/show_bug.cgi?id=727360#c3
--- Comment #3 from Brian Cain
Debian switches off caching of the hosts database in nscd for instance (since glibc 2.5), that's why it works there. I guess Redhat either does the same, or these old glibcs really behaved differently. I can't see how how current libcs would ever have worked differently. With nscd hosts caching the __libc_res_nquery routine never is entered (and never was), and that's the only one that calls res_hostalias, and that's the only one that respects this environment variable.
So barring nscd caching might re-enable the feature? Can you imagine any other workarounds?
It's either a documentation bug or a code bug, but in any case it's an upstream bug, now reported here: http://sourceware.org/bugzilla/show_bug.cgi?id=13375
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