Ocamlbuild "Hello, world!" or how to output to the log file
Put the following in the file myocamlbuild.ml in the root of your project tree:
(* Ocamlbuild plugin *)
let _ =
dispatch & function
| After_options -> Log.dprintf 0 "Hello, world!"
| _ -> ()
Invoke ocamlbuild. In _build/_log, you can see:
### Starting build.
# Compilation successful.
The integer argument to Log.dprinf is the minimum level at which the message will be logged. The ampersand (&) is commonly defined in Ocaml programs by
let ( & ) f x = f x
and serves as a low-precedence operator for reducing the number of parentheses required.