The Caml Hump: Cppo

Cppo is an equivalent of the C preprocessor targeted at the OCaml language and its variants. Its main purpose is to provide simple macro substitution (#define) and file inclusion (#include) for the occasional case when this is useful in OCaml. The implementation of cppo relies on the standard library of OCaml and on the standard parsing tools Ocamllex and Ocamlyacc, which contribute to the robustness of cppo across OCaml versions.