[ sorry, forgot to add CC ] On Sun, 19 Jun 2011 21:10:17 -0500 "Steve M. Robbins" <st...@sumost.ca> wrote:
> On Mon, Jun 20, 2011 at 01:30:25AM +0200, Cristian Greco wrote: > > > $ python-dbg -c "import libtorrent" > > Traceback (most recent call last): > > File "<string>", line 1, in <module> > > ImportError: /usr/lib/libboost_python-py26.so.1.46.1: undefined symbol: > > Py_InitModule4_64 > > [15005 refs] > > > > This error is obliviously due to the fact boost.python is built against > > pythonX and not pythonX-dbg. > > This is not obvious to me. In the past [1], this symptom has been traced to > a mismatch > between the python version used to build Boost and the python version used to > build > the application -- i.e. python-libtorrent. Yeah, you're right, and in this case the application is python-libtorrent-dbg instead, i.e. the "debug" extension libtorrent_d.so built for pythonX-dbg, while the current boost.python library is build (only) for pythonX. > I note that python2.6 (2.6.7-1) was recently uploaded. So first question is: > does a > rebuild of python WITHOUT CHANGES fix the problem? > > > The boost python library references Py_InitModule4_64 but does > not define it: > > $ objdump --demangle -T /usr/lib/libboost_python-py26.so.1.46.1| grep > Py_InitModule4_64 > 0000000000000000 D *UND* 0000000000000000 > Py_InitModule4_64 > > The python library defines this symbol: > > $ objdump -T --demangle /usr/lib/libpython2.6.so |grep Py_InitModule4 > 000000000010d970 g DF .text 00000000000002c7 Base > Py_InitModule4_64 > > Nothing in /usr/share/doc/python2.6-dbg/README.debug suggests it would be > needed to > define this symbol. I'm not saying there is something wrong with boost.python as it is now for "standard" extensions. I'm saying that "debug" extensions (those built for pythonX-dbg) won't work because they link against the current boost.python library, which is a "standard" build. We should provide one more version of boost.python built for pythonX-dbg (i.e. a build with -I/usr/include/pythonX_d and -DPy_DEBUG defined) so that "debug" extensions can work properly. There is no need to rebuild anything in the Python package itself because the "standard" libtorrent extension works fine as usual (no output): $ python -c "import libtorrent" $ python-dbg -c "import libtorrent" Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: /usr/lib/libboost_python-py26.so.1.46.1: undefined symbol: Py_InitModule4_64 [15005 refs] My patch proposal builds a "debug" libboost_python-py26-dbg.so.1.46.1 which libtorrent_d.so then links against: $ python-dbg -c "import libtorrent" [15005 refs] Thanks, -- Cristian Greco GPG key ID: 0xCF4D32E4
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