On Jul 16, 2010, at 12:16 AM, Amaury Forgeot d'Arc wrote: >2010/7/15 Barry Warsaw <ba...@python.org>: >> The first draft of PEP 3149 is ready for review. > >I like it!
Cool! >I think it could mention the case where packages are not installed >in the canonical directory, but placed elsewhere along the PYTHONPATH. >This is how I deploy applications, for example, and the differences >between python versions makes this a pain. Because of the way the results of ./configure are embodied in the Makefile's $SO variable, and that variable is used unconditionally from sysconfig (and thus distutils), once you've configured --with-so-abi-tag, that tag will be used globally everywhere. I've added a note about this. >The specific case of Windows should be mentioned: each foo.pyd >contains the name of the python library (Python27.dll) it has been >linked with; It must be rebuilt for a major version change. >IMO the Windows installers provided by python.org should be built with >a tag that contains this major number. The current version of the PEP and my implementation do not change the Windows builds at all. I don't feel qualified to integrate the ideas expressed in PEP 3149 for Windows builds, but I would be happy to accept patches to either the PEP or implementation to export the same tagging feature for Windows. >> Thus for example, an initial implementation of PEP 384, compiled with >> `--with-so-abi-tag=cpython-xy` would search for the following file >> names when extension module `foo` is imported (in this order):: >> >> foo.abi3.so >> foo.cpython-xy.so >> foo.so > >Is this the correct order? IMO the so-abi-tag is more precise and the >two first items should be swapped. Good point, fixed. >PyPy would also benefit from this patch: it can now use extension >modules, but the ABI is slightly different. By default, PyPy would >load only modules containing the ABI tag, and refuse foo.so which is >incompatible for sure. But the installations could still be shared >between Python implementations. Interesting. I've added a note about this to the PEP. Thanks for the feedback. -Barry
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