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Re:When can glibc be built with Clang? by pjmlp on Thursday October 14, 2021 @02:16AM (#28861057)
HP-UX, Aix, Solaris and mainframes POSIX environments are still around.

Additionally, embedded also has plenty of POSIX like OSes that arent' Linux based.

Re:When can glibc be built with Clang? by hackerbrother on Thursday October 14, 2021 @09:10PM (#28872619)
AIX is doing a lot better than HP-UX and Solaris are. In relative terms.