[Python-Dev] Binary Compatibility Issue with Python v2.6.5 and v3.1.2 (original) (raw)

David Cournapeau cournape at gmail.com
Tue Apr 20 14:50:51 CEST 2010

On Tue, Apr 20, 2010 at 9:19 PM, Phil Thompson <phil at riverbankcomputing.com> wrote:

When I build my C++ extension on Windows (specifically PyQt with MinGW) against Python v2.6.5 it fails to run under v2.6.4. The same problem exists when building against v3.1.2 and running under v3.1.1.

The error message is... ImportError: DLL load failed: The specified procedure could not be found. ...though I don't know what the procedure is. When built against v2.6.4 it runs fine under all v2.6.x. When built under v3.1.1 it runs fine under all v3.1.x. I had always assumed that an extension built with vX.Y.Z would always run under vX.Y.Z-1.

I don't know how well it is handled in python, but this is extremely hard to do in general - you are asking about forward compatibility, not backward compatibility.

Is there a reason why you need to do this ? The usual practice is to build against the oldest compatible version you can, so that it remains compatible with everything afterwards,

cheers,

David

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