CODEWITHSUNDEEP
ocaml
jackb
jackb

Reputation: 704

Compiling an OCaml Book example on Hashtbl

I've tried to compile the following example 

open Core.Std
module Foo_and_bar : sig
    type t = S of string | I of int
    include Hashable.S with type t := t
  end = struct
    module T = struct
      type t = S of string | I of int with sexp, compare
      let hash t1 t2 = (hashData t1)
    end
    include T
    include Comparable.Make(T)
  end;;

with camlopt -o exec core.cmxa algebra.ml that could be found on this book but as a result, I obtain an error with sexp declaration. Where am I going wrong?

Upvotes: 0

Views: 105

Answers (1)

ivg
ivg

Reputation: 35260

Core library comes with a tool that simplifies your life. It is named corebuild. With it you can compile just with:

corebuild algebra.native

And it will produce executable named algrebra.native

What concerning your try, then you are referring to core.cmxa and ocamlopt doesn't know where to find it. Moreover, you need to use camlp4 preprocessor, to enable syntax extensions. With ocamlfind wrapper around ocamlopt this can be achieved quite easily:

ocamlfind ocamlopt -thread -syntax camlp4o -package core.syntax algebra.ml -o exec

Here, -syntax camlp4o enables syntax extensions, -package core.syntax enables core and, also enables Core's syntax extensions.

But I still suggest to use corebuild, at least for the start.

Upvotes: 4

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