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guix: ocaml-build-system: Provide separate build system instances for OCaml 4.x and 5.x dev stacks.

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* guix/build-system/ocaml.scm:
Update header docs.
(make-ocaml-build-system): New variable.
(ocaml-build-system): Define in terms of `make-ocaml-build-system`.
(ocaml5-build-system): New variable.
(default-ocaml5, default-ocaml5-findlib, default-ocaml5-dune):
Add to exports.

Change-Id: Icfede9a62c48fb4e0eee0c94608239f6a1ad896f
Signed-off-by: Julien Lepiller <julien@lepiller.eu>
This commit is contained in:
Jason Conroy 2025-11-30 09:49:09 -05:00 • committed by Julien Lepiller
parent 500181d20b
commit bf57bfe274
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1 changed files with 44 additions and 18 deletions
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62
guix/build-system/ocaml.scm
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@ -40,29 +40,46 @@
default-ocaml
default-dune
lower
default-ocaml5-findlib
default-ocaml5
default-ocaml5-dune
make-lower
ocaml-build
ocaml-build-system))
ocaml-build-system
ocaml5-build-system))
;; Commentary:
;;
;; Standard build procedure for packages using ocaml. This is implemented as an
;; extension of `gnu-build-system'.
;; Standard build procedures for packages using ocaml. These are implemented
;; as extensions 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.
;; OCaml packages don't use a single standard for their build
;; system. Historically, some use autotools, other use custom configure
;; scripts with Makefiles, others use oasis to generate the configure script
;; and Makefile, and some use custom ocaml scripts. The majority of new
;; packages instead use Dune, which has a separate `dune-build-system`.
;;
;; 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.
;; Each phase in this build system will try to figure out which of the
;; approaches above is used for the 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
;; (e.g., `pkg/pkg.ml' or `pkg/build.ml') which can be used here too.
;;
;; Some packages use their own custom scripts, `pkg/pkg.ml' or
;; `pkg/build.ml'. They can be used here too.
;; Multiple instances of the build system exist to support different versions
;; of the OCaml compiler and its associated tools. Choose `ocaml-build-system`
;; for a build system that works with Guix's default version of the compiler,
;; or choose `ocamlX-build-system` for some other compiler version X.
;;
;; Adaptor functions of the form `package-with-ocamlX.Y` transform a package
;; to use a different compiler version for its own build and for those of all
;; transitive dependencies. These adaptors exist for user convenience, but a
;; package shipped with the distribution should generally use the
;; `build-system` field instead to identify the version of the OCaml stack
;; that it supports.
;;
;; Code:
@ -337,10 +354,19 @@ provides a 'setup.ml' file as its build system."
(define lower (make-lower default-ocaml default-findlib))
(define ocaml-build-system
(define (make-ocaml-build-system default-ocaml default-findlib)
(build-system
(name 'ocaml)
(description "The standard OCaml build system")
(lower lower)))
(lower (make-lower default-ocaml default-findlib))))
(define ocaml-build-system
;; The default instance of the build system, using Guix's default OCaml
;; compiler version.
(make-ocaml-build-system default-ocaml default-findlib))
(define ocaml5-build-system
(make-ocaml-build-system default-ocaml5 default-ocaml5-findlib))
;;; ocaml.scm ends here