using Unix functions in OCaml source

Question

I have a function to get the current time using the unix gettimeofday() in function time.ml. The file accesses the function in the following way: ``` open Unix; (*declared at the top of the file*) let get_time () = Unix.gettimeofday () ``` The corresponding entry in .mli file is like this: ``` val get_time : unit -> float ``` But during compiling them throws an error: ``` File "_none_", line 1, characters 0-1: No implementations provided for the following modules: Unix referenced from time.cmx ``` I have checked that the following files are present in /lib/ocaml directory: ``` unix.cmi, unix.a unix.cma unix.cmx unix.cmxa unix.cmxs unix.mli ``` and the path is set correctly set to in .bashrc file. ``` LD_LIBRARY_PATH=~/lib ``` Other functions like fprintf from Printf module work correctly inspite of being in the same /lib/ocaml directory. Any ideas what could be wrong? Am I doing something wrong or am I missing something?

Accepted Answer

You have to compile like this:

```
ocamlc unix.cma -c time.mli time.ml (* bytecode *)
```

or

```
ocamlopt unix.cmxa -c time.mli time.ml  (* native code *)
```

using Unix functions in OCaml source

Solution

Problem