From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: GNU Bazaar doesn't support the GNU build system
Date: Sun, 20 Jan 2013 15:26:09 +0100
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In-Reply-To: <87mww4bxdj.fsf@karetnikov.org> (Nikita Karetnikov's message of
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: bug-guix@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> AFAICT, the '#:phases' keyword can't be used because it requires
> '%standard-phases'.  There is also '#:builder', but I haven't found a
> way to use it.

So, #:phases is a keyword parameter recognized by =E2=80=98gnu-build-system=
=E2=80=99.
It lets you introduce, remove, or modify the normal build =E2=80=9Cphases=
=E2=80=9D (see
gnu-build-system.scm).  This is useful when you just have to introduce
small changes, and when the package=E2=80=99s build system is similar to th=
e GNU
build system=E2=80=94i.e., use something close to ./configure && make && ma=
ke
install (info "(guix) Defining Packages").

In the case of Python packages, the right thing would be to define a
=E2=80=98python-build-system=E2=80=99.  You=E2=80=99d add a (guix build-sys=
tem python) module
that exports =E2=80=98python-build-system=E2=80=99; packages would use it a=
s the value
of their =E2=80=98build-system=E2=80=99 field, which would mean that they g=
et built,
installed, and tested via the =E2=80=98python setup.py install=E2=80=99 etc=
. commands.
This way, many/most Python packages would need little or no
customization once they use =E2=80=98python-build-system=E2=80=99.

So that=E2=80=99s the idea.  You could check
development/python-modules/generic/default.nix in Nixpkgs to see how
it=E2=80=99s done there.

I realize this is a bit more involved than =E2=80=9Cjust=E2=80=9D packaging=
 the thing,
but it will be useful in the long run.

WDYT?

Ludo=E2=80=99.