dune-configurator
- Helper library for gathering system configurationdune-configurator
is a small library that helps writing OCaml scripts that test features available on the system, in order to generate config.h
files for instance.
Among other things, dune-configurator allows one to:
pkg-config
#define
from OCaml header filesconfig.h
fileThe entry point for this library is Configurator.V1
.
The following happens in a dune
project that contains some C code that needs to link against libpng
.
The following program (discover/discover.ml
) uses dune-configurator
to query pkg-config
and create cflags.sexp
and libs.sexp
:
let () =
Configurator.V1.main ~name:"libpng"
(fun c ->
let pkg_config =
match Configurator.V1.Pkg_config.get c with
| Some p -> p
| None -> failwith "Cannot find pkg-config"
in
let conf = Configurator.V1.Pkg_config.query ~package:"libpng" in
Configurator.V1.Flags.write_sexp "cflags.sexp" conf.cflags;
Configurator.V1.Flags.write_sexp "libs.sexp" conf.libs)
It can be built using the following discover/dune
file:
(executable (name discover) (libraries dune-configurator)) (rule (targets cflags.sexp libs.sexp) (action (run ./discover.exe)))
And used when building the C code in the following dune
file:
(library (name png) (foreign_stubs (language c) (names bindings) (flags :standard (:include discover/cflags.sexp))) (c_library_flags :standard (:include discover/libs.sexp)))