Dulwich C extensions and stand-alone Windows installation of bzr

[John Arbash Meinel]

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On 09/12/2011 09:39 AM, Eli Zaretskii wrote:
>> Date: Mon, 12 Sep 2011 16:48:17 +1000
>> From: Andrew Bennetts <andrew at bemusement.org>
>> Cc: Martin Pool <mbp at canonical.com>, bazaar at lists.canonical.com
>>
>> I'm no expert in Dulwich-related matters, but hopefully this is more
>> helpful than not:
> 
> Thanks.
> 
>> Distutils is part of the Python standard library.  If you don't have
>> distutils then it's highly unlikely you have Python.h, which I'm sure
>> Dulwich needs.
> 
> Yes, Python.h is needed, I already saw that by looking at the C
> sources.  But there's a world of difference between a single header
> (and maybe a bunch of others it pulls in) and a whole Python
> installation.  I'm guessing that distutils is a thin wrapper over
> compilation commands, in this particular case.  So showing the
> compilation command that is needed to build the shared library would
> allow hackers such as myself to hack a workable solution without the
> need to switch to a Python-based bzr installation.
> 
> Of course, having a pre-built DLL available somewhere would be much
> better, but failing that, I'm prepared to invest a reasonable amount
> of effort in having my private solution.  Been there, done that
> before.

Where will you get "Python.h" and all of the include files it pulls it?
It seems easy enough to grab the .msi installer, and you have what you need.

> 
>> i.e. a standard Python installation is a build dependency, if you
>> want to think of it in those terms.
> 
> Yes, that was my conclusion.  And therein lies the problem: it means
> one cannot have bzr-git with reasonable performance on Windows, unless
> one installs Python 2.6 and Python-based bzr.  And even then, building
> the extensions with a Free Software compiler on Windows is not
> supported out of the box, so some non-trivial effort would still be
> needed to pull that out.

You need it to *build* the extension. After that, the files can be
copied around, or possibly packaged into an installer.

> 
>>>> Are you speaking of building Python extensions, or other DLLs?
>>>
>>> Just the C extensions supplied with dulwich, nothing else.
>>
>> To the best of my knowledge, those C extensions *are* Python extensions
> 
> Sorry, that's my ignorance of the terminology showing up.
> 

John
=:->
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