Hoyt Koepke wrote: > I'm really not sure which mailing list to report this on -- it has got > to rank up there with one of the most obscure errors of all times. I > suspect it's an error in gcc's new openmp implementation, gomp, but > not sure; I can report it there if people think I should. > > In gcc 4.4.1, when I compile a completely empty .pyx module in (1) c++ > mode and (2) pass -lgomp to the linker, simply (3) importing that > empty module causes any subsequent use of matplotlib to segfault the > program. Changing either (1), (2) or (3) makes the error go away. > > I'm using the latest 32bit ubuntu (9.10), python 2.6.4, with the > latest cython-devel (2820:105c661599c9) and the latest matplotlib from > svn (8097). In matplotlib, I'm using the qt4agg backend. Everything > else appears to be working save for this error. > > If my main file is simply: > > import tests.emptymodule > import tests.plottest > > where emptymodules is a completely empty cython module and plottest is > > from matplotlib.pylab import * > > figure() > plot([0,1], [0,1], '-b') > show() > > The program segfaults on the plot() call, with backtrace > > (gdb) bt 8 > #0 0x00e03bc7 in __cxa_allocate_exception () from /usr/lib/libstdc++.so.6 > #1 0x0093f282 in py_to_agg_transformation_matrix (obj=0x8223f58, > errors=false) at src/agg_py_transforms.cpp:20 > #2 0x00946ff3 in _path_module::update_path_extents (this=0x8856098, > args=...) at src/path.cpp:346 > #3 0x0094e2fd in > Py::ExtensionModule<_path_module>::invoke_method_varargs (this=<value > optimized out>, method_def=0x8476e00, args=...) > at ./CXX/Python2/ExtensionModule.hxx:184 > #4 0x0093ae26 in method_varargs_call_handler > (_self_and_name_tuple=0x888448c, _args=0x8f052fc) at > CXX/Python2/cxx_extensions.cxx:1714 > #5 0x080dc0d0 in PyEval_EvalFrameEx () > #6 0x080dddf2 in PyEval_EvalCodeEx () > #7 0x080dc1b4 in PyEval_EvalFrameEx () > > It works for me here, but of course, I have a slightly different system.
gcc-4.3, python 2.5.2, Cython 0.12, and matplotlib SVN 8097. Have you verified that the same C++ compiler and version of libstdc++ is being used for everything? Mike -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
