MarsSeed  filed a deletion request for isl14 :
This legacy version from 7+ years ago seems not needed anymore. Only cloog-isl14 depends on it, but that is not used by anything. (Submitted deletion request for that.)
So in order to ease maintenance burden, I recommend to delete this as well, if there are no objections.
(Also, the main isl package has been adopted from AUR to Arch [core] under the name 'libisl'. So all isl* packages on AUR should either be renamed in accordance, or deleted if not used.)
 https://aur.archlinux.org/account/MarsSeed/  https://aur.archlinux.org/pkgbase/isl14/
Request #35958 has been Accepted by grawlinson :
[Autogenerated] Accepted deletion for isl14.