Re: [Xen-devel] [PATCH] autoconf: change python configure testing

[Roger Pau Monnà <roger.pau@xxxxxxxxxxxxx>]

2012/3/16 Ian Campbell <Ian.Campbell@xxxxxxxxxx>:
> On Thu, 2012-02-23 at 12:13 +0000, Roger Pau Monne wrote:
>> # HG changeset patch
>> # User Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
>> # Date 1329999113 -3600
>> # Node ID 6688425179fdf1fb39f3093362ba8053d1ae4f21
>> # Parent Â1b68427875f7ffe3025ea13c7f6e8cf71ce54769
>> autoconf: change python configure testing
>>
>> Switch from our custom m4 macro to ax_python_devel.m4 found in:
>>
>> http://www.gnu.org/software/autoconf-archive/ax_python_devel.html
>>
>> This provides the same set of test but uses python distutils instead
>> of python-config.
>>
>> This change will also force users to switch from setting PYTHON env
>> variable to using PYTHON_VERSION, which has to contain the python
>> version to use (e.g.: '2.6'), if the user has several python versions
>> installed and would like to use one different than the default.
>
> Are these env vars documented anywhere?
>
> Perhaps we could set PYTHON_VERSION based on PYTHON if the former is not
> set and the later is?

Yes, I could tweak ax_python_devel.m4 a little bit to disable
PYTHON_VERSION and continue using PYTHON (but we will depart from
stock ax_python_devel.m4, and it should be taken into account when
updating the macro file). I don't think allowing the user to set both
is a good idea, could lead to misconfiguration problems, and is
confusing to allow the user to set both PYTHON and PYTHON_VERSION.

>> Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
>>
>> diff -r 1b68427875f7 -r 6688425179fd config/Tools.mk.in
>> --- a/config/Tools.mk.in    ÂThu Mar 15 15:20:37 2012 +0000
>> +++ b/config/Tools.mk.in    ÂThu Feb 23 13:11:53 2012 +0100
>> @@ -1397,6 +1401,10 @@ Some influential environment variables:
>> Â ÂXML Â Â Â Â Path to xml2-config tool
>> Â ÂBASH Â Â Â ÂPath to bash shell
>> Â ÂXGETTEXT Â ÂPath to xgetttext tool
>> + ÂPYTHON_VERSION
>> + Â Â Â Â Â Â ÂThe installed Python version to use, for example '2.3'. This
>> + Â Â Â Â Â Â Âstring will be appended to the Python interpreter canonical
>> + Â Â Â Â Â Â Âname.

Here is the documentation, printed from `./configure --help`

>> Â ÂPKG_CONFIG Âpath to pkg-config utility
>> Â ÂPKG_CONFIG_PATH
>> Â Â Â Â Â Â Â Âdirectories to add to pkg-config's search path

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