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

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

[Ashish Agarwal]

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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"

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

[Gerd Stolpmann]

Am Samstag, den 08.10.2011, 18:46 -0400 schrieb Ashish Agarwal:
> 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.

camlp4 can also be a dependency of another package. Maybe camlp4 was
removed from one of the dependency lists as another result of the
update?

> 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.

This section is about including custom preprocessors. If you just want
plain camlp4, just set "-package camlp4 -syntax camlp4o".

> 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.

Well, the meaning is that there must be at least one package definition
setting how to call camlp4, in one of the listed packages or in a
dependency of these. As a user of camlp4, you don't need to do this in
your own META. The package "camlp4" includes the most basic way of
calling camlp4.

Hope this helps,

Gerd

> 
> 
> --- 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.
------------------------------------------------------------

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

[ygrek]

On Sat, 8 Oct 2011 18:46:18 -0400
Ashish Agarwal <agarwal1975@gmail.com> wrote:

> 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.

One can only use -syntax switch if some of the used packages defines a preprocessor.
Probably one of the packages included a syntax extension earlier, but stopped doing that?

-- 
 ygrek
 http://ygrek.org.ua

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

[Philippe Veber]

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Hi Ashish

this often happens to me after reinstalling godi, if I forget to install one
syntax extension used in my project. Instead of having a more meaningful
message like 'missing package bidule', I've got the message you report.
Maybe you could double check whether you installed all extensions used in
sequme ?

2011/10/9 Ashish Agarwal <agarwal1975@gmail.com>

> 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"
>
>

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

[Christophe Papazian]

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"
>

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

[Ashish Agarwal]

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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"
>>
>>
>

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

[Gerd Stolpmann]

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.
------------------------------------------------------------

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

[Ashish Agarwal]

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(Attachment sent separately to Gerd because mailing list rejects post with
it.)

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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