ocamlbuild, camlp4 and the _tags file

ocamlbuild, camlp4 and the _tags file

[Joel Reymont]

I see that ocamlbuild is being used to build camlp4 examples.

I thought I would ask a few questions on the meaning of the different  
tags since they are not described in my version of the ocamlbuild  
user's guide and the presentation slides.

 >>> "apply_operator.ml" or "type_quotation.ml": camlp4rf, use_camlp4

The above is clear.

 >>> "lambda_quot.ml": camlp4rf, use_camlp4_full

But what's the difference between use_camlp4_full and use_camlp4?

When should one be used vs the other?

 >>> "test_macros.ml": pp(camlp4of ./macros.cmo)
 >>> "lambda_test.ml": pp(camlp4of ./lambda_quot.cmo)

Why are these special options needed? When should I use them?

 >>> <parse_files.*>: camlp4of, use_camlp4_full, use_dynlink

Why is dynlink used here?

	Thanks, Joel

--
http://wagerlabs.com/

Re: [Caml-list] ocamlbuild, camlp4 and the _tags file

[Nicolas Pouillard]

On 4/30/07, Joel Reymont <joelr1@gmail.com> wrote:
> I see that ocamlbuild is being used to build camlp4 examples.
>
> I thought I would ask a few questions on the meaning of the different
> tags since they are not described in my version of the ocamlbuild
> user's guide and the presentation slides.
>
>  >>> "apply_operator.ml" or "type_quotation.ml": camlp4rf, use_camlp4
>
> The above is clear.
>
>  >>> "lambda_quot.ml": camlp4rf, use_camlp4_full
>
> But what's the difference between use_camlp4_full and use_camlp4?

use_camlp4_full put a dependency on camlp4fulllib.{cma,cmxa}.

The camlp4fullib contains all the camlp4 modules including parsers,
printers... Some modules are incompatible and then loading them
together is only useful when using camlp4 as a library.

> When should one be used vs the other?

use_camlp4_lib most of the time.

>  >>> "test_macros.ml": pp(camlp4of ./macros.cmo)
>  >>> "lambda_test.ml": pp(camlp4of ./lambda_quot.cmo)
>
> Why are these special options needed? When should I use them?

That's just examples, here macros.cmo and lambda_quot.cmo are camlp4
extensions.

In your case you can do something like.

"foo.ml": pp(camlp4o -filter map -filter fold)

>  >>> <parse_files.*>: camlp4of, use_camlp4_full, use_dynlink
>
> Why is dynlink used here?

Since camlp4 use dynlink one needs it too in order to link a standalone program.

-- 
Nicolas Pouillard