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.
Thanks,
Jason
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