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doc: Document ocaml-build-system. 

* doc/guix.texi (Build Systems) [ocaml-build-system]: New definition.
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Julien Lepiller 2017-01-28 12:11:42 +01:00
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@ -3291,6 +3291,49 @@ specified with the @code{#:glib} parameter.
Both phases are executed after the @code{install} phase.
@end defvr
@defvr {Scheme Variable} ocaml-build-system
This variable is exported by @code{(guix build-sytem ocaml)}. It implements
a build procedure for @uref{https://ocaml.org, OCaml} packages, which consists
of choosing the correct set of commands to run for each package. OCaml
packages can expect many different commands to be run. This build system will
try some of them.
When the package has a @file{setup.ml} file present at the top-level, it will
run @code{ocaml setup.ml -configure}, @code{ocaml setup.ml -build} and
@code{ocaml setup.ml -install}. The build system will assume that this file
was generated by @uref{http://oasis.forge.ocamlcore.org/, OASIS} and will take
care of setting the prefix and enabling tests if they are not disabled. You
can pass configure and build flags with the @code{#:configure-flags} and
@code{#:build-flags}. The @code{#:test-flags} key can be passed to change the
set of flags used to enable tests. The @code{#:use-make?} key can be used to
bypass this system in the build and install phases.
When the package has a @file{configure} file, it is assumed that it is a
hand-made configure script that requires a different argument format than
in the @code{gnu-build-system}. You can add more flags with the
@code{#:configure-flags} key.
When the package has a @file{Makefile} file (or @code{#:use-make?} is
@code{#t}), it will be used and more flags can be passed to the build and
install phases with the @code{#:make-flags} key.
Finally, some packages do not have these files and use a somewhat standard
location for its build system. In that case, the build system will run
@code{ocaml pkg/pkg.ml} or @code{ocaml pkg/build.ml} and take care of
providing the path to the required findlib module. Additional flags can
be passed via the @code{#:build-flags} key. Install is taken care of by
@command{opam-installer}. In this case, the @code{opam} package must
be added to the @code{native-inputs} field of the package definition.
Note that most OCaml packages assume they will be installed in the same
directory as ocaml, which is not what we want in guix. In particular, they
will install @file{.so} files in their module's directory, which is usually
fine because it is in the ocaml compiler directory. In guix though, these
libraries cannot be found and we use @code{CAML_LD_LIBRARY_PATH}. This
variable points to @file{lib/ocaml/site-lib/stubslibs} and this is where
@file{.so} libraries should be installed.
@end defvr
@defvr {Scheme Variable} python-build-system
This variable is exported by @code{(guix build-system python)}. It
implements the more or less standard build procedure used by Python