Lwt and OCamlMakefile

Lwt and OCamlMakefile

[orbitz]

Hey,
I'm using OCamlMakefile for a project that uses lwt, and I'm having  
trouble getting the right combination of settings to use the syntax  
extensiosn, specifically it is failing trying to calculate dependencies:

ocamlfind ocamldep -pp "camlp4o pa_lwt.cmo " pm_sge_utils.ml > ._d/ 
pm_sge_utils.d
Camlp4: Uncaught exception: DynLoader.Error ("pa_lwt.cmo", "file not  
found in path")


What do I need to do?

Thanks!

Re: [Caml-list] Lwt and OCamlMakefile

[Markus Mottl]

OCamlMakefile handles the preprocessing problem by requiring that the
first line of a file specifies the preprocessing command. It has the
form "(*pp ... *)", where "..." is the command you want to use for
preprocessing.  Both dependency calculation as well as compilation
will then be handled correctly.

Regards,
Markus

On Mon, Dec 20, 2010 at 20:05,  <orbitz@ezabel.com> wrote:
> Hey,
> I'm using OCamlMakefile for a project that uses lwt, and I'm having trouble
> getting the right combination of settings to use the syntax extensiosn,
> specifically it is failing trying to calculate dependencies:
>
> ocamlfind ocamldep -pp "camlp4o pa_lwt.cmo " pm_sge_utils.ml >
> ._d/pm_sge_utils.d
> Camlp4: Uncaught exception: DynLoader.Error ("pa_lwt.cmo", "file not found
> in path")
>
>
> What do I need to do?
>
> Thanks!
>
> _______________________________________________
> Caml-list mailing list. Subscription management:
> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list
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>



-- 
Markus Mottl        http://www.ocaml.info        markus.mottl@gmail.com

Re: [Caml-list] Lwt and OCamlMakefile

[orbitz]

Thanks, I forgot to mention that I am setting that:

(*pp camlp4o pa_lwt.cmo *)

(that is where it is coming from in my paste)

But it is still failing at the Dynlink.


On Dec 20, 2010, at 9:25 PM, Markus Mottl wrote:

> OCamlMakefile handles the preprocessing problem by requiring that the
> first line of a file specifies the preprocessing command. It has the
> form "(*pp ... *)", where "..." is the command you want to use for
> preprocessing.  Both dependency calculation as well as compilation
> will then be handled correctly.
>
> Regards,
> Markus
>
> On Mon, Dec 20, 2010 at 20:05,  <orbitz@ezabel.com> wrote:
>> Hey,
>> I'm using OCamlMakefile for a project that uses lwt, and I'm having  
>> trouble
>> getting the right combination of settings to use the syntax  
>> extensiosn,
>> specifically it is failing trying to calculate dependencies:
>>
>> ocamlfind ocamldep -pp "camlp4o pa_lwt.cmo " pm_sge_utils.ml >
>> ._d/pm_sge_utils.d
>> Camlp4: Uncaught exception: DynLoader.Error ("pa_lwt.cmo", "file  
>> not found
>> in path")
>>
>>
>> What do I need to do?
>>
>> Thanks!
>>
>> _______________________________________________
>> Caml-list mailing list. Subscription management:
>> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list
>> Archives: http://caml.inria.fr
>> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
>> Bug reports: http://caml.inria.fr/bin/caml-bugs
>>
>
>
>
> -- 
> Markus Mottl        http://www.ocaml.info         
> markus.mottl@gmail.com

Re: [Caml-list] Lwt and OCamlMakefile

[Michael Ekstrand]

On 12/20/2010 08:36 PM, orbitz@ezabel.com wrote:
> Thanks, I forgot to mention that I am setting that:
>
> (*pp camlp4o pa_lwt.cmo *)
>
> (that is where it is coming from in my paste)
>
> But it is still failing at the Dynlink.

The thing is that camlp4o doesn't know where to find pa_lwt.cmo.  This
is what ocamlfind helps with.  Unfortunately, OCamlMakefile's ocamlfind
integration is incomplete when it comes to preprocessors.

On some systems, you may be able do 'camlp4o -I +lwt pa_lwt.cmo', but
that isn't portable (it depends on lwt being installed in the std-lib
directory).

So, the real solution is to use a shell script which wraps 'camlp4o' and
looks up the appropriate package lines with ocamlfind.  It will do
something like

camlp4 $(ocamlfind -predicates preprocesor,syntax -syntax camlp4o
-package lwt.syntax)

but I do not remember the exact details.  I do remember that I defined a
PP environment variable in my Makefile with the path to the script, so I
could do

(*pp $PP lwt.syntax *)

and it would expand to wherever the shell script was (I had multiple
directories in my source tree when I used OCamlMakefile).

- Michael

Re: [Caml-list] Lwt and OCamlMakefile

[orbitz]

Great, that looks like it's working.  Many thanks.


On Dec 20, 2010, at 10:02 PM, Michael Ekstrand wrote:

> On 12/20/2010 08:36 PM, orbitz@ezabel.com wrote:
>> Thanks, I forgot to mention that I am setting that:
>>
>> (*pp camlp4o pa_lwt.cmo *)
>>
>> (that is where it is coming from in my paste)
>>
>> But it is still failing at the Dynlink.
>
> The thing is that camlp4o doesn't know where to find pa_lwt.cmo.  This
> is what ocamlfind helps with.  Unfortunately, OCamlMakefile's  
> ocamlfind
> integration is incomplete when it comes to preprocessors.
>
> On some systems, you may be able do 'camlp4o -I +lwt pa_lwt.cmo', but
> that isn't portable (it depends on lwt being installed in the std-lib
> directory).
>
> So, the real solution is to use a shell script which wraps 'camlp4o'  
> and
> looks up the appropriate package lines with ocamlfind.  It will do
> something like
>
> camlp4 $(ocamlfind -predicates preprocesor,syntax -syntax camlp4o
> -package lwt.syntax)
>
> but I do not remember the exact details.  I do remember that I  
> defined a
> PP environment variable in my Makefile with the path to the script,  
> so I
> could do
>
> (*pp $PP lwt.syntax *)
>
> and it would expand to wherever the shell script was (I had multiple
> directories in my source tree when I used OCamlMakefile).
>
> - Michael
>
> _______________________________________________
> Caml-list mailing list. Subscription management:
> http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list
> Archives: http://caml.inria.fr
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs

Re: [Caml-list] Lwt and OCamlMakefile

[Romain Beauxis]

Le mardi 21 décembre 2010 04:02:13, Michael Ekstrand a écrit :
> So, the real solution is to use a shell script which wraps 'camlp4o' and
> looks up the appropriate package lines with ocamlfind.  It will do
> something like
> 
> camlp4 $(ocamlfind -predicates preprocesor,syntax -syntax camlp4o
> -package lwt.syntax)

Would 
  camlp4o `ocamlfind query lwt.syntax}`/pa_lwt.cmo
do ?

Romain

Re: [Caml-list] Lwt and OCamlMakefile

[Jérémie Dimino]

On Mon, Dec 20, 2010 at 09:36:39PM -0500, orbitz@ezabel.com wrote:
> Thanks, I forgot to mention that I am setting that:
> 
> (*pp camlp4o pa_lwt.cmo *)

This one should work:

  (*pp camlp4o `ocamlfind query -i-format lwt` `ocamlfind query -predicates syntax,preprocessor -a-format -r lwt.syntax` *)

-- 
Jérémie

Re: Lwt and OCamlMakefile

[Sylvain Le Gall]

On 21-12-2010, Jérémie Dimino <jeremie@dimino.org> wrote:
> On Mon, Dec 20, 2010 at 09:36:39PM -0500, orbitz@ezabel.com wrote:
>> Thanks, I forgot to mention that I am setting that:
>> 
>> (*pp camlp4o pa_lwt.cmo *)
>
> This one should work:
>
>   (*pp camlp4o `ocamlfind query -i-format lwt` `ocamlfind query -predicates syntax,preprocessor -a-format -r lwt.syntax` *)
>

It will work on Linux. On Windows, you will get a problem because
ocamlfind EOL (win32) doesn't match "`...`" EOL wrapping (cygwin).

There was a similar problem with sexplib...

Regards,
Sylvain Le Gall

Re: [Caml-list] Lwt and OCamlMakefile

[Adrien]

On 21/12/2010, Sylvain Le Gall <sylvain@le-gall.net> wrote:
> On 21-12-2010, Jérémie Dimino <jeremie@dimino.org> wrote:
>> On Mon, Dec 20, 2010 at 09:36:39PM -0500, orbitz@ezabel.com wrote:
>>> Thanks, I forgot to mention that I am setting that:
>>>
>>> (*pp camlp4o pa_lwt.cmo *)
>>
>> This one should work:
>>
>>   (*pp camlp4o `ocamlfind query -i-format lwt` `ocamlfind query
>> -predicates syntax,preprocessor -a-format -r lwt.syntax` *)
>>
>
> It will work on Linux. On Windows, you will get a problem because
> ocamlfind EOL (win32) doesn't match "`...`" EOL wrapping (cygwin).
>
> There was a similar problem with sexplib...
>

For windows, for sexplib and mikmatch_*str*, I do the preprocessing on
linux[1] and put everything in a git branch which I then access on
windows (I also love gitweb's ability to generate a tarball of the
source :-) ).

It also avoids the need to have a working camlp* on windows (msys).

It doesn't work for mikmatch_pcre because it requires an additional
library (for the "macro" feature) but it's been quite handy so far.
Most credits for the script go to Julien Moutinho.

[1] http://git.ocamlcore.org/cgi-bin/gitweb.cgi?p=yypkg/yypkg.git;a=blob;f=preprocess.sh

--

Adrien Nader