open Goaljobs

let rec goal all () =
  require (built "program" ["main.c"; "utils.c"])

(* Goal: build the final program from source files. *)
and built program sources =
  target (more_recent [program] sources);
  List.iter (fun s -> require (compiled s)) sources;

  let objects = List.map (change_file_extension "o") sources in
  sh "cd $builddir && cc %s -o %s" (String.concat " " objects) program

(* Goal: Make sure a C file is compiled (to an object file). *)
and compiled c_file =
  let o_file = change_file_extension "o" c_file in
  target (more_recent [o_file] [c_file]);
  require (file_exists c_file);
  sh "cd $builddir && cc -c %s -o %s" c_file o_file