[capi-sig] Python File+Line from GDB?

[Campbell Barton]

Every so often I get a crash in C/C++ code cause by some function python calls.
The problem is I want to know what line number+file python called
before the crash, at the moment I just do this with print's, but this
is tedious.

Annoyingly this crash happens when the python stack is being printed
but there have been other situations when I have been debugging and
wanted to know the python line number+file and where there was no
python error,
Any hints?

---- Here is the backtrace - at #20 or #21 the info might be available.
(gdb) bt
#0  0x0000000000825962 in SND_Scene::DeleteObject (this=0x18032450,
pObject=0x15624320) at intern/SoundSystem/intern/SND_Scene.cpp:498
#1  0x0000000000dcd3c7 in ~KX_SoundActuator (this=0x1dc45270) at
source/gameengine/Ketsji/KX_SoundActuator.cpp:76
#2  0x0000000000e704e2 in CValue::Release (this=0x1dc45270) at
source/gameengine/Expressions/Value.cpp:584
#3  0x0000000000e46763 in ~SCA_IObject (this=0x18b9f940) at
source/gameengine/GameLogic/SCA_IObject.cpp:71
#4  0x0000000000de9408 in ~KX_GameObject (this=0x18b9f940) at
source/gameengine/Ketsji/KX_GameObject.cpp:124
#5  0x0000000000d8cffa in ~BL_DeformableGameObject (this=0x18b9f940)
at source/gameengine/Converter/BL_DeformableGameObject.cpp:42
#6  0x0000000000e704e2 in CValue::Release (this=0x18b9f940) at
source/gameengine/Expressions/Value.cpp:584
#7  0x0000000000d981eb in CValue::SpecialRelease (this=0x18b9f940) at
source/gameengine/Expressions/Value.h:239
#8  0x0000000000d9821f in CValue::PyDestructor (P=0x18b9f948) at
source/gameengine/Expressions/Value.h:243
#9  0x0000000000f6da29 in _Py_Dealloc (op=0x18b9f948) at Objects/object.c:1933
#10 0x000000000102f08d in frame_dealloc (f=0x15b361c0) at
Objects/frameobject.c:416
#11 0x0000000000f6da29 in _Py_Dealloc (op=0x15b361c0) at Objects/object.c:1933
#12 0x0000000000ffa421 in tb_dealloc (tb=0x5dff240) at Python/traceback.c:34
#13 0x0000000000f6da29 in _Py_Dealloc (op=0x5dff240) at Objects/object.c:1933
#14 0x0000000000ffa3a8 in tb_dealloc (tb=0x5dff1c8) at Python/traceback.c:33
#15 0x0000000000f6da29 in _Py_Dealloc (op=0x5dff1c8) at Objects/object.c:1933
#16 0x0000000000f62706 in insertdict (mp=0x1754230, key=0x5dd3790,
hash=5897959712516987849, value=0x5dff0d8) at Objects/dictobject.c:416
#17 0x0000000000f62fd5 in PyDict_SetItem (op=0x1754230, key=0x5dd3790,
value=0x5dff0d8) at Objects/dictobject.c:641
#18 0x0000000000f6739f in PyDict_SetItemString (v=0x1754230,
key=0x11331de "last_traceback", item=0x5dff0d8) at
Objects/dictobject.c:2182
#19 0x0000000000ff7897 in PySys_SetObject (name=0x11331de
"last_traceback", v=0x5dff0d8) at Python/sysmodule.c:82
#20 0x0000000000ff011a in PyErr_PrintEx (set_sys_last_vars=1) at
Python/pythonrun.c:1076
#21 0x0000000000fefdcf in PyErr_Print () at Python/pythonrun.c:978
#22 0x0000000000e25d88 in SCA_PythonController::Trigger
(this=0x10d6b350, logicmgr=0x126e4660) at
source/gameengine/GameLogic/SCA_PythonController.cpp:309
#23 0x0000000000e3b69a in SCA_LogicManager::BeginFrame
(this=0x126e4660, curtime=18.244133488337447,
fixedtime=0.016666666666666666) at
source/gameengine/GameLogic/SCA_LogicManager.cpp:257
#24 0x0000000000dc08f4 in KX_Scene::LogicBeginFrame (this=0x1e5afca0,
curtime=18.244133488337447) at
source/gameengine/Ketsji/KX_Scene.cpp:1311
#25 0x0000000000e155e5 in KX_KetsjiEngine::NextFrame (this=0x183f6ed0)
at source/gameengine/Ketsji/KX_KetsjiEngine.cpp:440
#26 0x0000000000d5ccc9 in StartKetsjiShell (area=0xb0087d0,
scenename=0x10d4fe72 "frank_test", maggie1=0x15a56390,
sipo=0x1dc8c790, always_use_expand_framing=1)
    at source/gameengine/BlenderRoutines/BL_KetsjiEmbedStart.cpp:376
#27 0x0000000000628319 in start_game () at source/blender/src/space.c:543
#28 0x000000000062e852 in winqreadview3dspace (sa=0xb0087d0,
spacedata=0x1fb5f2f0, evt=0x7fffbf19e150) at
source/blender/src/space.c:2464
#29 0x0000000000683170 in scrarea_do_winhandle (area=0xb0087d0,
evt=0x7fffbf19e150) at source/blender/src/spacetypes.c:156
#30 0x00000000006d8244 in scrarea_dispatch_events (sa=0xb0087d0) at
source/blender/src/editscreen.c:598
#31 0x00000000006d9c00 in screen_dispatch_events () at
source/blender/src/editscreen.c:1224
#32 0x00000000006da67a in screenmain () at source/blender/src/editscreen.c:1508
#33 0x00000000004f45ae in main (argc=6, argv=0x7fffbf19e5a8) at
source/creator/creator.c:820