[Python-Dev] please consider changing --enable-unicode default to ucs4

M.-A. Lemburg mal at egenix.com
Thu Oct 8 09:47:03 CEST 2009

Adam Olsen wrote:
> On Sun, Sep 20, 2009 at 10:17, Zooko O'Whielacronx <zookog at gmail.com> wrote:
>> On Sun, Sep 20, 2009 at 8:27 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:
>>> AFAIK, C extensions should fail loading when they have the wrong UCS2/4 setting.
>> That would be an improvement!  Unfortunately we instead get mysterious
>> misbehavior of the module, e.g.:
>> http://bugs.python.org/setuptools/msg309
>> http://allmydata.org/trac/tahoe/ticket/704#comment:5

I agree that a better error message would help. I'm just not sure
how to achieve that.

The error message you currently see gets generated by the dynamic
linker trying to resolve a Python Unicode API symbol: the API names
are mangled to assure that you cannot mix UCS2 interpreters and UCS4
extensions (and vice-versa).

We could try to scan the linker error message for 'Py.*UCS.'
and then replace the message with a more helpful one (in importdl.c),
but I'm not sure how portable that is.

Marc-Andre Lemburg

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