I am not using Cygwin, but would it be related with this:
https://caml.inria.fr/mantis/view.php?id=7268
https://github.com/alainfrisch/flexdll

(Alain Frisch seems to be one of the persons maintaining flexdll...)

Frédéric

Fri, 6 Oct 2017 16:38:54 +0200, Makarius : 


> We are moving towards uniform x86_64 support in Windows, including
> x86_64-cygwin (which is likely to behave better concerning infamous "DLL
> rebase" problems).
>
> Presently (e.g. in Isabelle/0b3fa8e22f22) this causes a new problem with
> OCaml, see also my thread on the Cygwin mailing list:
> https://cygwin.com/ml/cygwin/2017-10/msg00037.html
>
>   $ ocaml nums.cma
>   Cannot load required shared library dllnums.
>   Reason: /usr/lib/ocaml/stublibs/dllnums.so: flexdll error: cannot
>   relocate RELOC_REL32, target is too far: 0xfffffffc02c4c753  0x2c4c753.
>
>
> I am unsure what the situation of OCaml on Cygwin64 really is.
>
> Maybe some OCaml expert can say more about it.
>
>
>       Makarius
> _______________________________________________
> isabelle-dev mailing list
> isabelle-...@in.tum.de
> https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev

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