linux-kernel - Re: [PATCH] [ANNOUNCE] kconfig: Kconfiglib: a flexible Python Kconfig parser

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Date:	Tue, 1 Feb 2011 19:47:14 -0500
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Ulf Magnusson <ulfalizer.lkml@...il.com>
Cc:	linux-kbuild@...r.kernel.org, zippel@...ux-m68k.org,
	mmarek@...e.cz, rdunlap@...otime.net, akpm@...ux-foundation.org,
	andrea.gelmini@...ma.net, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH] [ANNOUNCE] kconfig: Kconfiglib: a flexible Python Kconfig parser

Hi,

On Tue, Feb 1, 2011 at 6:27 PM, Ulf Magnusson <ulfalizer.lkml@...il.com> wrote:
> Hi,
>
> This is the initial release of Kconfiglib: a Python library for
> scripting, debugging, and extracting information from Kconfig-based
> configuration systems.  It can be used to programmatically generate a
> .config when the '*conf' tools are too inflexible, to quickly find out
> interesting information about a Kconfig configuration such as dependency
> relations between symbols and where undefined symbols are referenced,
> and in applications that need to parse and extract information from
> Kconfig files.
>
Does that mean that when a kconfig-language change will happen, one
will not only must have to be Lex/YaCC and C fluent, but also, perl
and python ? That seem to be a lot of duplication to me.

I'd rather see the backend be changed so that it could be used with
SWIG to generate language bindings. I had WIP in this area, but
changes needed are rather intrusive. That said, the testsuite might be
interesting, I've been thinking about that for quite some time.

 - Arnaud

> For a much longer introduction including multiple examples, see
> arch/kconfig/kconfiglib.py.
>
> Have fun!
>
> Signed-off-by: Ulf Magnusson <ulfalizer.lkml@...il.com>
> ---
> Convenience links:
>
> Documentation, generated from kconfiglib.py with pydoc -w:
> http://dl.dropbox.com/u/10406197/kconfiglib.html
>
> Examples as separate files:
> http://dl.dropbox.com/u/10406197/kconfiglib-examples.tar.gz
>
>
> The patch should be preferably be applied to a recent kernel, i.e. Linus's
> (2.6.38-rc3 at the time of writing).  Due to recent Kconfig changes, the
> kconfigtest.py test suite - which compares output character-for-character -
> will indicate failure on older (a few months old) kernels versions even though
> the outputs are functionally equivalent.
>
>  Documentation/kbuild/kconfig-language.txt |    5 +
>  Documentation/kbuild/kconfig.txt          |    8 +
>  README                                    |   13 +
>  scripts/kconfig/Makefile                  |   26 +-
>  scripts/kconfig/kconfiglib.py             | 3918 +++++++++++++++++++++++++++++
>  scripts/kconfig/kconfigtest.py            |  396 +++
>  6 files changed, 4365 insertions(+), 1 deletions(-)
>  create mode 100644 scripts/kconfig/kconfiglib.py
>  create mode 100644 scripts/kconfig/kconfigtest.py
> [...]
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