Ned Deily added the comment:
> No, PEP 3149 is about the Python ABI, following PEP 3147,
> which implements this for PYC files.
> The intent is to be able to have mutliple *Python* ABI/API versions
> installed side-by-side, not multiple platform ABI versions :-)
Well, for all practical purposes, the platform *is* part of the ABI :=)
So, if we have been supporting multiple P@P 3147 extension modules since 3.2, I
don't see this as a risky change. I don't think anyone is advocating
installing distributions with dozens of extension module variants as a general
practice. But it seems like there are times when it would be useful to have
the capability to have more than one and this seems like a safe and logical
extension to what PEP 3147 already provides. I don't have a strong opinion
about other platforms.
For OS X, because of the complexity and usefulness of mixing and matching
various fat CPU archs and OS X ABIs ("deployment target"), pip already supports
selecting the proper wheel to download and wheel creators are tagging with the
right metadata to make the right decisions, so I don't think the changes here
bring much added value for OS X users, except for two things: (1) we now
support PEP 3147 ext file names (which for some reason was never fully
implemented on OS X and should have been) which is useful for the original PEP
3147 use cases (for example, if someone wants to distribute non-debug and debug
versions of ext modules); (2) the addition of '-darwin' to the PEP 3147 ext
file name allows for this additional use case of allowing multiple platform
extensions to be stored in the same directory without fear of name clash (even
if only one is eventually installed). I think both are reasonable and safe
changes for OS X.
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