[Python-Dev] Re: [Python-checkins]python/dist/src/Objects unicodeobject.c, 2.197, 2.198

[M.-A. Lemburg]

Martin v. Löwis wrote:
> "Tim Peters" <tim.one at comcast.net> writes:
> 
>>That's fine for gcc then, so long as we don't branch on the contents of
>>uninitialized memory, and we just fixed a bug of that sort.
>>
>>If Py_UNICODE ever resolves to a signed 2-byte type, though, the sign bit is
>>still in play for legit contents.
> 
> Right. I agree that we don't want to use a signed 2-byte type. Given
> that only MS uses a two-byte wchar_t (to my knowledge), and that
> theirs is unsigned, having an autoconf test to detect that this
> configuration is not supported is more than enough.

Since wchar_t is the only case where a signed type can pop
up, why not extend the autoconf test to check for signedness
and then reject signed wchar_t value as not-usable (ie.
undefine HAVE_USABLE_WCHAR_T).

It looks to me as if this would resolve the problem once and
for all. Signed values simply cause too many problems for this
kind of application.

-- 
Marc-Andre Lemburg
eGenix.com

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