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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016, 2017 Julien Lepiller <julien@lepiller.eu>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build-system ocaml)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix derivations)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix packages)
+  #:use-module (ice-9 match)
+  #:export (%ocaml-build-system-modules
+            ocaml-build
+            ocaml-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for packages using ocaml. This is implemented as an
+;; extension of `gnu-build-system'.
+;;
+;; OCaml packages don't use a single standard for their build system. Some use
+;; autotools, other use custom configure scripts with Makefiles, others use
+;; oasis to generate the configure script and Makefile and lastly, some use
+;; custom ocaml scripts.
+;;
+;; Each phase in the build system will try to figure out what the build system
+;; is for that package. Most packages come with a custom configure script and
+;; a Makefile that in turn call custom build tools. Packages built with oasis
+;; will have a `setup.ml' file in the top directory, that can be used for all
+;; phases. In that case the Makefile is here only to call that script. In case
+;; the setup.ml do not work as expected, the @var{use-make} argument can be
+;; used to ignore the setup.ml file and run make instead.
+;;
+;; Some packages use their own custom scripts, `pkg/pkg.ml' or
+;; `pkg/build.ml'. They can be used here too.
+;;
+;; Code:
+
+(define %ocaml-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build ocaml-build-system)
+    ,@%gnu-build-system-modules))
+
+(define (default-ocaml)
+  "Return the default OCaml package."
+
+  ;; Do not use `@' to avoid introducing circular dependencies.
+  (let ((module (resolve-interface '(gnu packages ocaml))))
+    (module-ref module 'ocaml)))
+
+(define (default-findlib)
+  "Return the default OCaml-findlib package."
+
+  ;; Do not use `@' to avoid introducing circular dependencies.
+  (let ((module (resolve-interface '(gnu packages ocaml))))
+    (module-ref module 'ocaml-findlib)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (ocaml (default-ocaml))
+                (findlib (default-findlib))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:source #:target #:ocaml #:findlib #:inputs #:native-inputs))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("ocaml" ,ocaml)
+                         ("findlib" ,findlib)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build ocaml-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (ocaml-build store name inputs
+                      #:key (guile #f)
+                      (outputs '("out")) (configure-flags ''())
+                      (search-paths '())
+                      (make-flags ''())
+                      (build-flags ''())
+                      (out-of-source? #t)
+                      (use-make? #f)
+                      (tests? #t)
+                      (test-flags ''("--enable-tests"))
+                      (test-target "test")
+                      (install-target "install")
+                      (validate-runpath? #t)
+                      (patch-shebangs? #t)
+                      (strip-binaries? #t)
+                      (strip-flags ''("--strip-debug"))
+                      (strip-directories ''("lib" "lib64" "libexec"
+                                            "bin" "sbin"))
+                      (phases '(@ (guix build ocaml-build-system)
+                                  %standard-phases))
+                      (system (%current-system))
+                      (imported-modules %ocaml-build-system-modules)
+                      (modules '((guix build ocaml-build-system)
+                                 (guix build utils))))
+  "Build SOURCE using OCAML, and with INPUTS. This assumes that SOURCE
+provides a 'setup.ml' file as its build system."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (ocaml-build #:source ,(match (assoc-ref inputs "source")
+                                (((? derivation? source))
+                                 (derivation->output-path source))
+                                ((source)
+                                 source)
+                                (source
+                                 source))
+                    #:system ,system
+                    #:outputs %outputs
+                    #:inputs %build-inputs
+                    #:search-paths ',(map search-path-specification->sexp
+                                          search-paths)
+                    #:phases ,phases
+                    #:configure-flags ,configure-flags
+                    #:test-flags ,test-flags
+                    #:make-flags ,make-flags
+                    #:build-flags ,build-flags
+                    #:out-of-source? ,out-of-source?
+                    #:use-make? ,use-make?
+                    #:tests? ,tests?
+                    #:test-target ,test-target
+                    #:install-target ,install-target
+                    #:validate-runpath? ,validate-runpath?
+                    #:patch-shebangs? ,patch-shebangs?
+                    #:strip-binaries? ,strip-binaries?
+                    #:strip-flags ,strip-flags
+                    #:strip-directories ,strip-directories)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                                         ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:system system
+                                #:inputs inputs
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define ocaml-build-system
+  (build-system
+    (name 'ocaml)
+    (description "The standard OCaml build system")
+    (lower lower)))
+
+;;; ocaml.scm ends here