I don't understand the question - probably missing context.
Whether glibc wants to support it as an extension is a valid question but per POSIX this is very clearly UB.
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Why? I doubt we want that constraint on the implementation. We already can't support process shared across two implementations.
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I don't think glibc should support this (thereby constraining itself); I'm just saying someone could argue for it.
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My preference is not to support things that are UB unless they clearly don't put additional constraints on implementation.
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The UB in this case is in Berkeley DB. Enjoy :-) https://bugzilla.redhat.com/show_bug.cgi?id=1394862 …
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