Anecdotally, this was recently on hacker news:

http://ukupat.github.io/tabs-or-spaces/

the OCaml part shows that most OCaml repos on github use 2 spaces, some
use 4 spaces, and very few use tabs.

Le Tue, 05 Jan 2016, Drup a écrit :

> Well, there is an implicit consensus, it's called ocp-indent ....
> 
> Le 05/01/2016 14:46, Christophe Troestler a écrit :
> >On Tue, 5 Jan 2016 10:12:24 +0100, Sébastien Hinderer wrote:
> >>Dear all,
> >>
> >>I am wondering whether there are some guidelines that have been proposed
> >>regarding the way OCaml code should be presented?
> >>
> >>More specifically: am I correct that it is considered not such a good
> >>practise to mix tabs and spaces in code indentation? And if so, are
> >>there objective reasons for that?
> >>
> >>It seems Emacs is configured to do that (mixing tabs and spaces) by
> >>default, can anybody confirm?
> >Indeed.  You have to put
> >
> >     (setq-default indent-tabs-mode nil)
> >
> >in your ~/.emacs.d/init.el file.
> >
> >Best,
> >C.
> >
> >
> >P.S. If there is a consensus on this list that TABs shouldn't be used for OCaml code, I can enable this for OCaml files in Tuareg.
> >
> 
> 
> 
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