[Distutils] EasyInstall and build-time dependencies
ronaldoussoren at mac.com
Fri Jun 10 17:12:13 CEST 2005
On 9-jun-2005, at 13:14, Phillip J. Eby wrote:
> At 12:36 PM 6/9/2005 -0700, Ronald Oussoren wrote:
>> Are there any plans to teach EasyInstall about build time
>> dependencies? And example of this would be the dependency of PIL on
>> libjpeg and libtiff.
> Yes and no. I plan to refactor EasyInstall so that packages that
> want to, can use its find-and-download capabilities to install
> their own dependencies of that sort. However, if PyPI ever includes
> metadata that EasyInstall could consult about a package's non-
> Python dependencies, it could be used to inform the user.
That's good enough for me. For the major reason for adding explicit
dependencies to normal C libraries would be to avoid strange failures
when installing a package through EasyInstall. It would be nice if
EasyInstall could give a nice message about missing C libraries, that
obviously requires the cooperation of the packages.
> There's also the possibility that we could enhance Eggs to be able
> to deal with headers and libraries, and then create distutils
> wrappers for building libraries or finding them on the system.
> Then, PIL could depend on "py-libjpeg" and "py-libtiff" wrappers
> that could be used to find the headers and libraries for compiling
> the PIL extensions.
My major gripe about PIL's build procedure is that it *optionally*
depends on some graphics libraries. This means that I end up with a
(for me at least) mostly useles version of PIL if I forget to install
It's amazing how little code and infrastructure is needed to build
CPAN-like functionality for Python. Keep up the good work.
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