On Sunday, June 23, 2013 3:25:52 PM UTC+4, Yukihiro Nakadaira wrote:
> Cause of this problem is that ubuntu's python is built with
> -Bsymbolic-functions flag.
> With this flag, libpython and vim see different function address for same
> function.
>
> Test:
> $ cat foo.c
>
> void *foo() { return &foo; }
> $ cat main.c
> #include <stdio.h>
> void *foo();
> int main() {
> printf("foo=%p main=%p\n", foo(), &foo);
> return 0;
> }
> $ cc -shared -fPIC -o libfoo.so foo.c -Wl,-Bsymbolic-functions
>
> $ cc main.c -L. -lfoo
> $ LD_LIBRARY_PATH=. ./a.out
> foo=0x7eff0cafe770 main=0x4005e0
>
>
> --
> Yukihiro Nakadaira - [email protected]
Just filed a bug report:
https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/1196047. Let’s look,
maybe we won’t have to do anything.
As an alternative I can suggest one of the following:
1. Detect -Wl,-Bsymbolic-functions flag in configure and fail or switch to
=dynamic build. (I would really prefer failing.)
2. Add #if Py_UBUNTU_WORKAROUND macros guarding
#define _PyObject_NextNotImplemented dll__PyObject_NextNotImplemented
static iternextfunc dll__PyObject_NextNotImplemented;
at the top (in the #else branch of #if defined(DYNAMIC_PYTHON) ||
defined(PROTO)) and something like
PyObject *aobj;
PyRun_SimpleString("class A(object): pass");
if (PyErr_Occurred())
return -1;
if (!(aobj = PyRun_String("A", Py_eval_input, globals, globals)))
return -1;
dll__PyObject_NextNotImplemented = aobj->tp_iternext;
Py_DECREF(aobj);
after main python initialization. Macros should be added to CFLAGS by
configure script if -Wl,\S*-Bsymbolic-functions is found in python LDFLAGS.
This will workaround our problem as this way we get
_PyObject_NextNotImplemented that is really used by python.
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