[karmic][regression] def_readonly on static property results in AttributeError at import time

[Václav Šmilauer]

Compiling simple module wrapping static data member results in AttributeError when importing the module:

$ cat foo.cc
#include<boost/python.hpp>
struct Foo{
 static int bar;
};
int Foo::bar=3;

BOOST_PYTHON_MODULE(foo){
 boost::python::class_<Foo>("Foo",boost::python::init<>()).def_readonly("bar",Foo::bar);
}

$ g++ -o foo.so -I/usr/include/python2.6 -fPIC -shared -lboost_python-mt foo.cc
$ PYTHONPATH=. python -c 'import foo'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: 'Boost.Python.StaticProperty' object attribute '__doc__' is read-only

This bug (?) was described first at c++-sig in the http://thread.gmane.org/gmane.comp.python.c++/13979 thread.

Karmic only; no other tested distribution (hardy,jaunty,lenny,squeeze,sid) affected. Using different g++ version on karmic makes no difference.

Installed version libboost-python1.38-dev=1.38.0-6ubuntu4

[Anderson Lizardo (lizardo)]

Renato found a workaround for the issue:

http://thread.gmane.org/gmane.comp.python.c++/13979/focus=14000

Can you try that with your testcase?

[Václav Šmilauer (eudoxos)]

The workaround compiles, but doesn't give expected results: it only work on instances, but not on types. With def_readonly, I would be able to use both

Vector3.UNIT_X
Vector3().UNIT_X

but with the workaround, only Vector3().UNIT_X will work.

Any other progress?

[Scott Howard (showard314)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 457688, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.