On Wed, Apr 22, 2020 at 6:01 AM Richard W.M. Jones <rjo...@redhat.com> wrote:
> It turns out it comes from dune (the build tool), although I'm still
> unclear how and why.  In any case I added a rather hacky workaround so
> I can get the build going again:

No, it isn't dune; it's ocaml itself.  From "Changes" under "Bug fixes":

- #7917, #9426: Use GCC option -fexcess-precision=standard when available,
  avoiding a problem with x87 excess precision in Float.round.
  (Xavier Leroy, review by Sébastien Hinderer)

-- 
Jerry James
http://www.jamezone.org/
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