[Fontforge-devel] trouble loading python extension

[Joshua R. <jr...@ya...>]

It used to work fine, but I got a newer Mountain Lion Mac and tried to install the python extension of fontforge.  First, I installed fontforge using macports, but then deactivated it, because I had forgotten to install XQuartz first.  Then when I tried using macports version of fontforge @20120731_3+freetype_bytecode+python27, it complained about "SystemError: No initialization function in fontforge library".

So, I tried building fontforge from source, as I've done in the past, but unlike the past, it didn't try to install the extension into /opt/local/lib, though I used the PKG_CONFIG_PATH variable and --with-python-binary switches.  The build put the extension into /usr/local/lib.  Didn't seem like a good idea to mix ports and non-ports anyway, so I built a new python from source and installed into /usr/local.  Then I configured fontforge to point at my new python install:

make distclean &&
PKG_CONFIG_PATH=/Library/Frameworks/Python.framework/Versions/2.7/lib/pkgconfig LDFLAGS="-L/usr/local/lib -L/opt/local/lib -lintl" CFLAGS="-O0 -g" ./configure --with-pythonbinary=/usr/local/bin/python2.7 --enable-debug


Unfortunately, when I try to import fontforge from this new python, I get a segfault:

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000048

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   org.python.python             0x00000001016c66ce PyErr_Occurred + 14
1   org.python.python             0x00000001016ee94f _PyObject_GC_Malloc + 127
2   org.python.python             0x0000000101674e99 PyType_GenericAlloc + 57
3   org.python.python             0x000000010163809c PyDescr_NewWrapper + 44
4   org.python.python             0x000000010167703b PyType_Ready + 347
5   libfontforge.2.dylib          0x0000000101205a1c FinalizePythonTypes + 348 (python.c:18260)
6   libfontforge.2.dylib          0x0000000101205c19 CreatePyModule + 73 (python.c:18304)
7   libfontforge.2.dylib          0x0000000101205e4a CreateAllPyModules + 58 (python.c:18362)
8   libfontforge.2.dylib          0x00000001012078c3 fontforge_python2_init + 51 (python.c:18846)
9   fontforge.so                  0x00000001002f9f43 initfontforge + 19 (fontforgepyhook.c:21)
10  org.python.python             0x00000001000bf17a _PyImport_LoadDynamicModule + 170 (importdl.c:54)
11  org.python.python             0x00000001000bd8f7 import_submodule + 327 (import.c:2700)
12  org.python.python             0x00000001000bdafb load_next + 251 (import.c:2515)
13  org.python.python             0x00000001000be942 PyImport_ImportModuleLevel + 1170 (import.c:2224)
14  org.python.python             0x000000010009c0a4 builtin___import__ + 132 (bltinmodule.c:49)
15  org.python.python             0x000000010000c9b1 PyObject_Call + 97 (abstract.c:2529)
16  org.python.python             0x00000001000a0a44 PyEval_CallObjectWithKeywords + 180 (ceval.c:3891)
17  org.python.python             0x00000001000a79c6 PyEval_EvalFrameEx + 25478 (ceval.c:2333)
18  org.python.python             0x00000001000a8f57 PyEval_EvalCodeEx + 2103 (ceval.c:3253)
19  org.python.python             0x00000001000a8fd6 PyEval_EvalCode + 54 (ceval.c:665)
20  org.python.python             0x00000001000c8932 PyRun_InteractiveOneFlags + 578 (pythonrun.c:1370)
21  org.python.python             0x00000001000c8a8e PyRun_InteractiveLoopFlags + 222 (pythonrun.c:777)
22  org.python.python             0x00000001000c8b37 PyRun_AnyFileExFlags + 119 (pythonrun.c:746)
23  org.python.python             0x00000001000db7fa Py_Main + 2890 (main.c:640)

So looks like it's trying to access an object that's null.  Here is a listing of the object that's getting passed into the depths of Python, where I don't have debugging symbols enabled.  I can't tell if it's ok or not, but hoping someone on the list can tell:


18260if ( PyType_Ready(typ) < 0 ) {
(gdb) p typ 
$1 = (PyTypeObject *) 0x101537d20
(gdb) p *typ
$2 = {
  ob_refcnt = 1, 
  ob_type = 0x0, 
  ob_size = 0, 
  tp_name = 0x10146d86b "fontforge.awcontext", 
  tp_basicsize = 56, 
  tp_itemsize = 0, 
  tp_dealloc = 0x101203950 <PyFF_AWContext_dealloc>, 
  tp_print = 0, 
  tp_getattr = 0, 
  tp_setattr = 0, 
  tp_compare = 0, 
  tp_repr = 0, 
  tp_as_number = 0x0, 
  tp_as_sequence = 0x0, 
  tp_as_mapping = 0x0, 
  tp_hash = 0, 
  tp_call = 0, 
  tp_str = 0, 
  tp_getattro = 0, 
  tp_setattro = 0, 
  tp_as_buffer = 0x0, 
  tp_flags = 131563, 
  tp_doc = 0x10146d880 "FontForge Auto Width/Kern Context object", 
  tp_traverse = 0, 
  tp_clear = 0, 
  tp_richcompare = 0, 
  tp_weaklistoffset = 0, 
  tp_iter = 0, 
  tp_iternext = 0, 
  tp_methods = 0x0, 
  tp_members = 0x0, 
  tp_getset = 0x101537ec0, 
  tp_base = 0x0, 
  tp_dict = 0x0, 
  tp_descr_get = 0, 
  tp_descr_set = 0, 
  tp_dictoffset = 0, 
  tp_init = 0, 
  tp_alloc = 0, 
  tp_new = 0, 
  tp_free = 0, 
  tp_is_gc = 0, 
  tp_bases = 0x0, 
  tp_mro = 0x0, 
  tp_cache = 0x0, 
  tp_subclasses = 0x0, 
  tp_weaklist = 0x0, 
  tp_del = 0, 
  tp_version_tag = 0
}