Re: [gentoo-dev] PYTHON_DEPEND - Suggested replacement for NEED_PYTHON

[Sebastian Pipping]

On 01/10/10 09:29, Arfrever Frehtes Taifersar Arahesis wrote:
> I would like to suggest introduction of support for PYTHON_DEPEND variable, which
> would be a better replacement for NEED_PYTHON variable. NEED_PYTHON variable
> does not allow to specify that e.g. only versions of Python 2 are accepted.
> (Eventually PYTHON_DEPEND variable will have to be set only in ebuilds of packages
> not supporting installation for multiple versions of Python.)
>
> Suggested syntax:
>   PYTHON_DEPEND="[USE_flag?] <X[:[Y][:[Z]]]> [X[:[Y][:[Z]]]]"
>     <required_component>, [optional_component]
>     X - Major version of Python ('2' or '3') or '*'.
>     Y - Minimal version of Python in the form of ${major_version}.${minor_version}.
>     Z - Maximal version of Python in the form of ${major_version}.${minor_version}.
>         It will be probably very rarely used.
>
> Examples:
>   PYTHON_DEPEND="2"
>     Dependency on any version of Python 2.
>
>   PYTHON_DEPEND="2:2.5"
>     Dependency on Python 2.7, 2.6 or 2.5.
>
>   PYTHON_DEPEND="*:2.6"
>     Dependency on Python 3.2, 3.1, 3.0, 2.7 or 2.6.
>
>   PYTHON_DEPEND="2:2.7 3:3.1"
>     Dependency on Python 3.2, 3.1 or 2.7.
>
>   PYTHON_DEPEND="2:2.5:2.6"
>     Dependency on Python 2.6 or 2.5.
>
>   PYTHON_DEPEND="2::2.6"
>     Dependency on Python 2.6, 2.5 or 2.4.
>
>   PYTHON_DEPEND="python? 2"
>     Dependency on any version of Python 2 when "python" USE flag is enabled.
>

While I don't object improvements or changes on that front at all:

 - How are SUPPORT_PYTHON_ABIS and RESTRICT_PYTHON_ABIS affected
   by NEED_PYTHON now and by PYTHON_DEPEND in the future?

 - The proposed approach doesn't look intuitive to me from a quick
   view, sorry:  Neither the examples nor the grammar.  I didn't give
   it that much time to be fair, though.



Sebastian