Re: [Caml-list] glob-ing dependencies for a custom ocamlbuild rule

["Christoph Höger" <christoph.hoeger@tu-berlin.de>]

I should have mentioned it, but I am not particularly interested in
letting ocamlbuild build one of the <dir>/**/*.mo files, I just want to
make sure that when it comes to building <dir>.modlib.impl or not,
ocamlbuild considers _all_ source files in <dir> and rebuilds if one has
changed. Is that covered by "dynamic dependencies"?

Am 12.04.2016 um 14:48 schrieb Gabriel Scherer:
> Ocamlbuild distinguishes "static dependencies", which are expressed in
> the ~deps argument of the rule declaration, and "dynamic dependencies"
> which are files required by the rule command.
> 
> The notion of pattern accepted for static dependencies is indeed
> rather rigid (less expressive than the patterns used in the _tags
> file), and what you have in mind does not work. The supported patterns
> are deterministic: given one file, there is a unique way a pattern can
> match, and a pattern is instantiated into a single file by any
> substitution environment. There is a good reason for that: it is not
> clear what the semantics of your proposal would be. Indeed, ocamlbuild
> tries to recursively build all static dependencies before deciding to
> apply a rule, but what does it mean to build all **/*.mo? Listing the
> one that exist in the source directory is easy, but how would you
> guess which one to try to build recursively using other rules?
> 
> Notions such as "all files matching P in this directory" are not
> stable to the replacement of a source file by an intermediate target:
> for example if tomorrow you decide that one of the .mo file will be
> itself pre-processed from a .mo.pp file, it won't be seen by a
> existing-file globbing technique anymore. You have a lot of
> flexibility in the behaviors you implement in the build command, so
> you can easily do the matching there and "build" those files, but it
> will result in a relatively fragile rule; this is you decision to
> make, and not in the path of least resistance.
> 
> 
> On Tue, Apr 12, 2016 at 8:00 AM, Christoph Höger
> <christoph.hoeger@tu-berlin.de> wrote:
>> Dear all,
>>
>> I want to write a custom ocamlbuild rule that basically combines all
>> source files from a given (sub-)directory and thus depends on these files.
>>
>> However, the following does not work:
>>
>>         rule "normalize (preprocess) a Modelica library"
>>           ~prods:["%.modlib.impl"; "%.modlib.sign"]
>>           ~deps:["%.modlib/**/*.mo"; "%.modlib.depends"]
>>           ~doc:"Preprocesses a Modelica library"
>>           modlibc_command
>>
>> It seems that the rule does not expand the pattern in the dependency. Is
>> there a way to achieve something similar? It would be a major PITA to
>> add all these files manually...
>>
>> regards,
>>
>> Christoph
>> --
>> Christoph Höger
>>
>> Technische Universität Berlin
>> Fakultät IV - Elektrotechnik und Informatik
>> Übersetzerbau und Programmiersprachen
>>
>> Sekr. TEL12-2, Ernst-Reuter-Platz 7, 10587 Berlin
>>
>> Tel.: +49 (30) 314-24890
>> E-Mail: christoph.hoeger@tu-berlin.de
>>
>> --
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> 


-- 
Christoph Höger

Technische Universität Berlin
Fakultät IV - Elektrotechnik und Informatik
Übersetzerbau und Programmiersprachen

Sekr. TEL12-2, Ernst-Reuter-Platz 7, 10587 Berlin

Tel.: +49 (30) 314-24890
E-Mail: christoph.hoeger@tu-berlin.de