Github user pbchou commented on the pull request:
https://github.com/apache/trafficserver/pull/571#issuecomment-219549881
I think this depends on whether GNU extensions are being used or not since
the man page does say that you "must" reinitialize with optind = 0 if you go
back and forth between traditional and GNU extensions between scans. I am not
certain what constitutes a GNU extension in the opstring, but I can report that
two of the plugins included in this PR (background_fetch and regex_revalidate),
which both use optind = 1 currently, do not play well together.
background_fetch uses opstring "lc" while regex_revalidate uses "c:l:" so I
suspect the colons are considered GNU extensions since that is the only
difference besides the order of the letters. So sounds like glibc requires 0
and other libraries require 1 so this would need an #ifdef then. Note, there
are actually 15 plugins using getopt (11 use optind=0 and 4 use optind=1).
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