Rober, I had to fix your last commit about this, please review.
On Tue, Oct 28, 2008 at 2:22 AM, Robert Bradshaw
<[EMAIL PROTECTED]> wrote:
> On Oct 27, 2008, at 5:50 PM, Jason Evans wrote:
>
>> Using changeset a71073d1250c of cython-devel, the following program:
>>
>> ----------------
>> cdef foo():
>> cdef str s
>> s = "hello"
>> foo()
>> ----------------
>>
>> causes the following warning when linking:
>>
>> lyken:~> cython foo.pyx
>> lyken:~> gcc -shared -pthread -fPIC -fwrapv -Wall -fno-strict-aliasing
>> -I/usr/local/python/dbg/include/python2.6 foo.c -ofoo.so
>> foo.c: In function '__pyx_f_3foo_foo':
>> foo.c:212: warning: implicit declaration of function
>> 'PyStr_CheckExact'
>>
>> and the following error when importing the resulting module:
>>
>> lyken:~> /usr/local/python/dbg/bin/python
>> Python 2.6 (r26:66714, Oct 21 2008, 10:58:37)
>> [GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> import foo
>> Traceback (most recent call last):
>> File "<stdin>", line 1, in <module>
>> ImportError: ./foo.so: undefined symbol: PyStr_CheckExact
>> [26355 refs]
>>>>>
>>
>> I've seen Cython generate similar bogus calls to PyStr_CheckExact
>> several times today while coding, but in other cases I was able to
>> make
>> the problem go away by adding type specifications so that
>> everything was
>> clearly a str. In this case, it looks like the compiler doesn't
>> realize
>> that "hello" is a str (nor does it recognize str("hello") as a str).
>>
>> So, I think there are two problems:
>>
>> 1) Cython doesn't recognize string literals as str.
>>
>> 2) PyStr_CheckExact doesn't exist, at least for Python 2.6. It does
>> have PyString_CheckExact though.
>
> Looks like it was (2), from Python 2.2+. Thanks for the fix.
>
> - Robert
>
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--
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
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