Linking problem using Eclipse and C++

[pacha]

I am using Ubuntu, I installed Panda3D 1.9 from the repo and I am using eclipse with the following include/library configuration:

i.imgur.com/ciwzERP.png
i.imgur.com/TES4hVN.png

I got the following errors while compiling:

Does someboy know how to fix this? Thanks.

03:08:35 **** Incremental Build of configuration Release for project panda3dplayground ****
make all
Building target: panda3dplayground
Invoking: Cross G++ Linker
g++ -L/usr/lib/panda3d -o “panda3dplayground” ./main.o -lp3pystub -lp3framework -lpandafx -lp3pystub -lpandaexpress -lpanda -lp3framework -lp3direct
/usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Cmp' /usr/lib/panda3d/libpanda.so: undefined reference to PyUnicodeUCS4_FromWideChar’
/usr/lib/panda3d/libpanda.so: undefined reference to PyDict_SetItem' /usr/lib/panda3d/libpanda.so: undefined reference to PyExc_ValueError’
/usr/lib/panda3d/libpanda.so: undefined reference to PyDict_SetItemString' /usr/lib/panda3d/libpanda.so: undefined reference to PyType_IsSubtype’
/usr/lib/panda3d/libpanda.so: undefined reference to PyString_FromString' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Fetch’
/usr/lib/panda3d/libpanda.so: undefined reference to PyExc_StandardError' /usr/lib/panda3d/libpanda.so: undefined reference to PyInt_AsSsize_t’
/usr/lib/panda3d/libpanda.so: undefined reference to PyArg_Parse' /usr/lib/panda3d/libpanda.so: undefined reference to PyEval_RestoreThread’
/usr/lib/panda3d/libpandaexpress.so: undefined reference to PyString_AsStringAndSize' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_CallFunction’
/usr/lib/panda3d/libpanda.so: undefined reference to PyDict_Size' /usr/lib/panda3d/libpanda.so: undefined reference to PyString_Size’
/usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Print' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_SetString’
/usr/lib/panda3d/libpanda.so: undefined reference to PyGILState_Ensure' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_CallObject’
/usr/lib/panda3d/libpanda.so: undefined reference to PyString_FromStringAndSize' /usr/lib/panda3d/libp3dtool.so: undefined reference to PySys_GetObject’
/usr/lib/panda3d/libp3dtool.so: undefined reference to PyList_GetItem' /usr/lib/panda3d/libpanda.so: undefined reference to PyExc_AssertionError’
/usr/lib/panda3d/libp3dtoolconfig.so: undefined reference to Py_InitModule4_64' /usr/lib/panda3d/libpanda.so: undefined reference to PyModule_AddStringConstant’
/usr/lib/panda3d/libpanda.so: undefined reference to PyGen_Type' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Compare’
/usr/lib/panda3d/libpanda.so: undefined reference to PyList_Append' /usr/lib/panda3d/libpanda.so: undefined reference to PyMapping_GetItemString’
/usr/lib/panda3d/libp3dtoolconfig.so: undefined reference to PyArg_ParseTuple' /usr/lib/panda3d/libpanda.so: undefined reference to PyTuple_Pack’
/usr/lib/panda3d/libpanda.so: undefined reference to PyLong_FromUnsignedLongLong' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Repr’
/usr/lib/panda3d/libpanda.so: undefined reference to PyInt_FromLong' /usr/lib/panda3d/libpanda.so: undefined reference to PyArg_ParseTupleAndKeywords’
/usr/lib/panda3d/libpanda.so: undefined reference to _Py_NoneStruct' /usr/lib/panda3d/libpanda.so: undefined reference to PyList_SetItem’
/usr/lib/panda3d/libpanda.so: undefined reference to PyCallable_Check' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Clear’
/usr/lib/panda3d/libpanda.so: undefined reference to PyLong_AsUnsignedLongLong' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_ExceptionMatches’
/usr/lib/panda3d/libpanda.so: undefined reference to PyDict_New' /usr/lib/panda3d/libpanda.so: undefined reference to PyUnicodeUCS4_AsWideChar’
/usr/lib/panda3d/libpanda.so: undefined reference to PyInt_AsLong' /usr/lib/panda3d/libpanda.so: undefined reference to PyUnicodeUCS4_GetSize’
/usr/lib/panda3d/libpanda.so: undefined reference to PyObject_RichCompareBool' /usr/lib/panda3d/libpanda.so: undefined reference to PyModule_AddObject’
/usr/lib/panda3d/libpanda.so: undefined reference to PyGILState_Release' /usr/lib/panda3d/libpanda.so: undefined reference to PySequence_GetItem’
/usr/lib/panda3d/libpanda.so: undefined reference to PyLong_AsUnsignedLong' /usr/lib/panda3d/libpanda.so: undefined reference to _Py_NotImplementedStruct’
/usr/lib/panda3d/libpanda.so: undefined reference to PySequence_Size' /usr/lib/panda3d/libpanda.so: undefined reference to PyExc_TypeError’
/usr/lib/panda3d/libpanda.so: undefined reference to PyNumber_Long' /usr/lib/panda3d/libpanda.so: undefined reference to Py_BuildValue’
/usr/lib/panda3d/libpanda.so: undefined reference to PyEval_InitThreads' /usr/lib/panda3d/libpanda.so: undefined reference to PyType_Ready’
/usr/lib/panda3d/libpanda.so: undefined reference to PyFloat_FromDouble' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_GenericSetAttr’
/usr/lib/panda3d/libpanda.so: undefined reference to PyObject_IsTrue' /usr/lib/panda3d/libpanda.so: undefined reference to PyImport_GetModuleDict’
/usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Free' /usr/lib/panda3d/libpanda.so: undefined reference to PyNumber_Float’
/usr/lib/panda3d/libpanda.so: undefined reference to PyBool_FromLong' /usr/lib/panda3d/libp3dtoolconfig.so: undefined reference to PyLong_AsLong’
/usr/lib/panda3d/libpanda.so: undefined reference to PyExc_IndexError' /usr/lib/panda3d/libpanda.so: undefined reference to PyLong_AsLongLong’
/usr/lib/panda3d/libpandaexpress.so: undefined reference to PyLong_FromLongLong' /usr/lib/panda3d/libpanda.so: undefined reference to PyFloat_AsDouble’
/usr/lib/panda3d/libpanda.so: undefined reference to PyEval_SaveThread' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Restore’
/usr/lib/panda3d/libpanda.so: undefined reference to PyErr_WarnEx' /usr/lib/panda3d/libpanda.so: undefined reference to PyString_Type’
/usr/lib/panda3d/libpanda.so: undefined reference to PyExc_StopIteration' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Type’
/usr/lib/panda3d/libpanda.so: undefined reference to PyObject_Call' /usr/lib/panda3d/libpanda.so: undefined reference to PySequence_Check’
/usr/lib/panda3d/libpanda.so: undefined reference to PyType_GenericAlloc' /usr/lib/panda3d/libpanda.so: undefined reference to PyString_AsString’
/usr/lib/panda3d/libpanda.so: undefined reference to PyModule_AddIntConstant' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_CallMethod’
/usr/lib/panda3d/libp3dtool.so: undefined reference to Py_IsInitialized' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_GetAttrString’
/usr/lib/panda3d/libpanda.so: undefined reference to PyList_New' /usr/lib/panda3d/libpanda.so: undefined reference to PyExc_SystemExit’
/usr/lib/panda3d/libpanda.so: undefined reference to PyDict_GetItem' /usr/lib/panda3d/libpanda.so: undefined reference to PyExc_FutureWarning’
/usr/lib/panda3d/libpanda.so: undefined reference to PyTuple_New' /usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Format’
/usr/lib/panda3d/libpanda.so: undefined reference to PyCFunction_NewEx' /usr/lib/panda3d/libp3dtoolconfig.so: undefined reference to PyLong_FromUnsignedLong’
/usr/lib/panda3d/libpanda.so: undefined reference to PyExc_AttributeError' /usr/lib/panda3d/libpanda.so: undefined reference to PyObject_GenericGetAttr’
/usr/lib/panda3d/libpanda.so: undefined reference to PyTuple_Size' /usr/lib/panda3d/libpanda.so: undefined reference to PySequence_Fast’
/usr/lib/panda3d/libpanda.so: undefined reference to PyErr_Occurred' /usr/lib/panda3d/libpanda.so: undefined reference to PySequence_Tuple’
/usr/lib/panda3d/libpanda.so: undefined reference to `PyDict_DelItemString’
collect2: error: ld returned 1 exit status
make: *** [panda3dplayground] Error 1

03:08:35 Build Finished (took 402ms)

[rdb]

Hmm, that’s strange, p3pystub is supposed to contain these symbols. Hmm, sometimes the linker is strict about the order of libraries, perhaps you should move the p3pystub option to the end of the command or so?

If that doesn’t work, does “nm” of the p3pystub library show that these symbols exist?
Could you try linking with -lpython2.7 (or whatever version your distro uses) instead of -lp3pystub to see if that would work?

[pacha]

@rdb

Hmm, that’s strange, p3pystub is supposed to contain these symbols. Hmm, sometimes the linker is strict about the order of libraries, perhaps you should move the p3pystub option to the end of the command or so?

If that doesn’t work, does “nm” of the p3pystub library show that these symbols exist?
Could you try linking with -lpython2.7 (or whatever version your distro uses) instead of -lp3pystub to see if that would work?

Moving p3pystub to the bottom made it work, thanks.

Although I fixed it before adding python2.7 at the bottom.

[rdb]

Good to know. For the record, you should never link both p3pystub and python2.7; if you don’t need Python, you should use the former, otherwise you should use the latter.