[Python-Dev] versioned .so files for Python 3.2

[M.-A. Lemburg]

Ronald Oussoren wrote:
> 
> On 28 Aug, 2010, at 12:29, Martin v. Löwis wrote:
>>
>> - wide-unicode: this is a tricky one. I'm tempted to say that the
>>  stable ABI should always use a Py_UNICODE that matches the platform's
>>  wchar_t. Alternative proposals are welcome.
> 
> Sizeof(wchar_t) is 4 on OSX, but the Apple frameworks use a 16-bit type to represent unicode codepoints (UniChar).  Current builds on OSX use a 16-bit unicode type which makes it pretty cheap to convert strings from Python to a C array of UniChar.
> 
> I'm therefore -1 on switching to a wide unicode build on OSX. 

-1 on always using wchar_t as well. Python's default is UCS2
and the stable ABI should not change that.

I also think that this information is not relevant for the
stable ABI: Extensions that want to stick to the stable ABI
should really not have to know whether Py_UNICODE maps to
wchar_t or not. If they want to interface to a local whcar_t
type they can use the conversion APIs we have for that in the
Unicode API: PyUnicode_FromWideChar() and PyUnicode_AsWideChar().

BTW: Wasn't one of the main reasons for having versioned .so files
the idea to be able to have UCS2 and UCS4 versions installed
side-by-side ?

-- 
Marc-Andre Lemburg
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