Thanks Nick, the binutils change does appear to have solved the
problem:
https://koji.fedoraproject.org/koji/taskinfo?taskID=48212537
https://kojipkgs.fedoraproject.org//work/tasks/2537/48212537/build.log
Note (for Xavier) that I did NOT need to make any change to OCaml or
the flags that it passes to gas.
I think we can say this problem is fixed at the moment.
Rich.
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