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From: Olivier Levillain <olivier.levillain@ssi.gouv.fr>
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Subject: Re: [Caml-list] camlp4 for js_of_ocaml toplevels

Hi,

> One thing I noticed was when I (accidentally) had unix_isatty
> returning false, and presumably camlp4 attempting to marshal a
> compiler ast the js_of_ocaml runtime would die with a JSON error.  I
> presume this is an issue with js_of_ocaml's marshalling code?

I think I recently stumbled on this one: the default camlp4 printer is
"auto", which prints text when stdout is a tty and binary AST when it is
not. To force the text or AST setting, you should use the -printer
option of camlp4, with either "Camlp4OCamlPrinter" (text) or
"Camlp4OCamlAstDumper" parameter.

The name of the available printers correspond to files in the
/usr/lib/ocaml/camlp4/Camlp4Printers (on Debian).

Sorry for the noise if I'm wrong.

Regards,
Olivier Levillain