Re: [Caml-list] ocamlfind: When using -syntax, the META variable 'preprocessor' must be set

[Ashish Agarwal <agarwal1975@gmail.com>]

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Hi Gerd,

I've attached a minimal example that exhibits the problem. Here's my test.

Confirm PG'OCaml is not installed.
$ godi_list -installed | grep pgocaml
(* no output *)

$ cd foo (* the unpacked example directory *)
$ ocamlbuild foo.cma
Finished, 1 target (0 cached) in 00:00:00.
+ ocamlfind ocamldep -syntax camlp4o -modules foo.ml > foo.ml.depends
ocamlfind: When using -syntax, the META variable 'preprocessor' must be set
Command exited with code 2.
Compilation unsuccessful after building 1 target (0 cached) in 00:00:00.

Install PG'OCaml.
$ godi_perform -build godi-pgocaml

Confirm PG'OCaml is installed.
$ godi_list -installed | grep pgocaml
godi-pgocaml                   inst:1.4godi2

Compile again. I now get the correct error about not having a database
connection.
$ ocamlbuild foo.cma
Finished, 0 targets (0 cached) in 00:00:00.
+ ocamlfind ocamldep -package pgocaml -package pgocaml.syntax -syntax
camlp4o -modules foo.ml > foo.ml.depends
File "foo.ml", line 1, characters 23-42:
Camlp4: Uncaught exception: Unix.Unix_error (20 | CstTag21, "connect", "")

Preprocessing error on file foo.ml
Command exited with code 2.
Compilation unsuccessful after building 1 target (0 cached) in 00:00:00.


On Sun, Oct 9, 2011 at 5:02 PM, Gerd Stolpmann <info@gerd-stolpmann.de>wrote:

> I'm a bit surprised. Please, can you try to isolate the problem, and
> send me a bug report?
>
> Gerd
>
> Am Sonntag, den 09.10.2011, 13:16 -0400 schrieb Ashish Agarwal:
> > Thanks for all the responses. The problem turned out to be the simple
> > one mentioned by Philippe. I just forgot to install PG'Ocaml. It would
> > be nice if findlib could give error messages about missing packages
> > that are clearly in the dependency list.
> >
> > On Sun, Oct 9, 2011 at 8:23 AM, Christophe Papazian
> > <christophe.papazian@gmail.com> wrote:
> >         I got this problem a few days ago, and need a quick fix.
> >         Everything was installed but after an upgrade I got the same
> >         kind of error.
> >         To avoid the problem, i drop the "-syntax" parameter and
> >         replace it with "-pp" :
> >
> >         What *should* work for me : ocamlfind ocamlc -package
> >         js_of_ocaml -syntax camlp4o
> >         What's *really* work for me : ocamlfind ocamlc -package
> >         js_of_ocaml -pp "camlp4o -I /path/to/js_of_ocaml pa_js.cmo"
> >
> >         Hope this help
> >
> >          Christophe
> >
> >         Le 9 oct. 11 à 00:46, Ashish Agarwal a écrit :
> >
> >
> >
> >                 I get the error below after reinstalling OCaml with
> >                 the latest version with GODI. My code has not changed,
> >                 so I'm wondering if there is a change to ocamlbuild or
> >                 ocamlfind that is causing this. The issue appears to
> >                 be that -package camlp4 should be included in the
> >                 ocamlfind command but it is not.
> >
> >                 The section "Does Findlib support camlp4" in the
> >                 findlib User's Guide discusses the 'preprocessor'
> >                 variable, but I can't figure out how exactly how to
> >                 adjust my META file or whether I really need to since
> >                 it was working before.
> >
> >                 ocamlbuild sequme.cma sequme.cmxa sequme.cmxs
> >                 Finished, 0 targets (0 cached) in 00:00:00.
> >                 + ocamlfind ocamldep -package batteries -package
> >                 biocaml -package netclient -package netstring -package
> >                 shell -package sqlite3 -syntax camlp4o -modules
> >                 sequme/bowtie.mli > sequme/bowtie.mli.depends
> >                 ocamlfind: When using -syntax, the META variable
> >                 'preprocessor' must be set
> >                 Command exited with code 2.
> >
> >                 --- META ---
> >                 requires = "netstring shell netclient batteries
> >                 biocaml pgocaml"
> >                 version = "0.0"
> >                 archive(byte) = "sequme.cma"
> >                 archive(native) = "sequme.cmxa"
> >
> >
> >
> >
>
> --
> ------------------------------------------------------------
> Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
> Creator of GODI and camlcity.org.
> Contact details:        http://www.camlcity.org/contact.html
> Company homepage:       http://www.gerd-stolpmann.de
> *** Searching for new projects! Need consulting for system
> *** programming in Ocaml? Gerd Stolpmann can help you.
> ------------------------------------------------------------
>
>

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