Re: [Caml-list] deriving

[Lin <mysnowls@163.com>]

I have no Fedora machine at hand, but from the error message it seems to 
have something to do with camlp4. Do you have it installed correctly? 
Check if you have the camlp4 command by `which camlp4`.

On 01/28/2012 12:51 AM, Matej Košík wrote:
> Hi,
>
> I would like to play with / evaluate the "deriving" library:
> http://code.google.com/p/deriving/wiki/Introduction
>
> How can I:
> - create a Ocaml top-level where I can play with it?
> - compile programs which take advantage of this library?
>
> I am on Fedora 16.
>
> What I have tried is this:
>
>    $ sudo yum install ocaml-deriving-devel
>    $ rlwrap ocaml
>    # #use "topfind";;
>    # #require "deriving";;
>    No such package: %{camlp4} - Required by `deriving'
>
> I am not sure how to proceed.
>
> ------------------------------------------------
>
> Concerning linking against this library, I have tried this:
>
>    $ cat Main.ml
>
>        let s = Show.show<int>  3
>
>    $ ocamlc -I +deriving -pp "camlp4of -I `ocamlc -where`/deriving
> nums.cma deriving.cma" deriving.cma Main.ml -o main
>
>        File "ghost-location", line 7, characters 8--144:
>        Error: Unbound value Show.show
>        make: *** [main] Error 2
>
> where "Main.ml" is supposed to be a program that uses syntactic sugar
> provided by "deriving" library.
>
> What is the proper way to get things compiled? I have failed to find any
> examples.
>
> Thanks in advance for the help.
>