Re: [Caml-list] Build number and date in OCaml?

[Daniel Weil <danweil68@gmail.com>]

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If you like ocambuild, an alternative is to add a small rule in your
ocamlbuild plugin.
The ocamlbuild wiki gives an example of ocamlbuild plugin that create a "
version.ml" file in the _build directory at each build. You can then link
your code with this version.ml file.

http://brion.inria.fr/gallium/index.php/Automatic_Version_Generation

Daniel




2013/4/11 Alain Frisch <alain.frisch@lexifi.com>

> On 04/09/2013 01:38 PM, Étienne André wrote:
>
>> I quite stupidly used the Unix.gettimeofday() function before realizing
>> that it is of course executed at runtime.
>>
>
> As others suggested, you can tell your build system to generate an ad hoc
> file containing the compile-time information.  Another approach is to use a
> preprocessor to inject such compile-time information into the source code
> "on the fly" during its compilation.  This can be done with a dedicated
> Camlp4 syntax extension or a -ppx preprocessor (available in trunk only,
> with syntactic extension points being designed in the extension_points
> branch of the OCaml SVN).
>
> As an illustration of the -ppx approach, I've created a tiny preprocessor
> which uses the OCaml toplevel to evaluate expressions and inserts the
> result as constants in the compiled code.
>
> The source code for this -ppx preprocessor can be found here:
>
> http://caml.inria.fr/cgi-bin/**viewvc.cgi/ocaml/branches/**
> extension_points/experimental/**frisch/eval.ml?&view=markup<http://caml.inria.fr/cgi-bin/viewvc.cgi/ocaml/branches/extension_points/experimental/frisch/eval.ml?&view=markup>
>
> and here is an example of what you can write with it:
>
> http://caml.inria.fr/cgi-bin/**viewvc.cgi/ocaml/branches/**
> extension_points/experimental/**frisch/test_eval.ml?&view=**markup<http://caml.inria.fr/cgi-bin/viewvc.cgi/ocaml/branches/extension_points/experimental/frisch/test_eval.ml?&view=markup>
>
> (To play with it, you need to checkout the extension_points branch and
> after compiling it: cd experimental/frisch && make eval)
>
> -- Alain
>
>
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