py27-gobject @2.28.7. Build fails on Big Sur: Undefined symbols for architecture x86_64: "_PyCObject_AsVoidPtr" and others

[kencu (Ken)]

I believe the same issue affects all python supports of py-gobject:

1 warning generated.
  CCLD   libpyglib-2.0-python2.7.la
1 warning generated.
1 warning generated.
Undefined symbols for architecture x86_64:
  "_PyCObject_AsVoidPtr", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_init_internal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyCObject_Type", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_GetItem", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_New", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyDict_SetItem", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Fetch", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Format", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_GivenExceptionMatches", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_NewException", referenced from:
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_NormalizeException", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Occurred", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Print", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_Restore", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_SetObject", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyErr_SetString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyEval_InitThreads", referenced from:
      _pyglib_enable_threads in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyExc_ImportError", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyExc_ValueError", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyFloat_FromDouble", referenced from:
      _pyglib_float_from_timeval in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyGILState_Ensure", referenced from:
      _pyglib_gil_state_ensure in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gil_state_ensure_py23 in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyGILState_Release", referenced from:
      _pyglib_gil_state_release in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gil_state_release_py23 in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyImport_ImportModule", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyInt_AsLong", referenced from:
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyInt_FromLong", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_register_exception_for_domain in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_CallObject", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_GetAttrString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_IsTrue", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_Repr", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyObject_SetAttrString", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyString_AsString", referenced from:
      _pyglib_init in libpyglib_2_0_python2.7_la-pyglib.o
      _pyglib_gerror_exception_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyString_FromString", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyThread_create_key", referenced from:
      _pyglib_enable_threads in libpyglib_2_0_python2.7_la-pyglib.o
  "_PyTuple_GetItem", referenced from:
      __pyglib_handler_marshal in libpyglib_2_0_python2.7_la-pyglib.o
  "__PyObject_CallFunction_SizeT", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_NoneStruct", referenced from:
      _pyglib_error_check in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_NotImplementedStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_TrueStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
  "__Py_ZeroStruct", referenced from:
      __pyglib_generic_ptr_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
      __pyglib_generic_long_richcompare in libpyglib_2_0_python2.7_la-pyglib.o
ld: symbol(s) not found for architecture x86_64

[kencu (Ken)]

this python 2.7 port is on the build path for gimp2, and gimp2 is an in-demand port.

[kencu (Ken)]

py38-gobject fails identically. log attached.

[kencu (Ken)]

I think these missing symbols are supposed to be found in python itself, so this issue might actually be with the python builds

[kencu (Ken)]

I am not certain, but this issue sounds like it could be with the cpython section of python, and there is a lot of work going on there.

See <​https://github.com/python/cpython/commit/41761933c1c30bb6003b65eef1ba23a83db4eae4>

See <​https://bugs.python.org/issue41100>

[kencu (Ken)]

running the test suite for python38 now on Big Sur.

[kencu (Ken)]

I don't immediately see an issue with cobject running the test suite, but there are many test suite errors with python38 on Big Sur. Log attached.

[kencu (Ken)]

Josh, copying you in here as this looks to me to be a problem with python rather than py-gobject. Thoughts?

[kencu (Ken)]

only think with that, Frank, is that if someone types "py27-gobject" into the port search for tickets box, now they don't find this ticket...

<​https://ports.macports.org/port/py27-gobject/tickets>

[mf2k (Frank Schima)]

It's how we have always done python ports. Normally python issues affect all python versions.

[mf2k (Frank Schima)]

In other words, if one is looking for py27-gobject issues, they should search for py-gobject. That probably is not documented anywhere however.

[kencu (Ken)]

It looks like the only difference between the link that fails on Big Sur and the link that succeeds on Mojave is:

-Wl,-undefined -Wl,dynamic_lookup

which I believe is that same libtool bug that every other libtool port has been having.

mojave:
/usr/bin/clang -dynamiclib -Wl,-undefined -Wl,dynamic_lookup -o .libs/libpyglib-2.0-python2.7.0.dylib  .libs/libpyglib_2_0_python2.7_la-pyglib.o   -L/opt/local/lib -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lintl -lffi  -Os -arch x86_64 -Wl,-headerpad_max_install_names -Wl,-syslibroot -Wl,/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -arch x86_64 -Wl,-framework -Wl,CoreFoundation   -install_name  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/libpyglib-2.0-python2.7.0.dylib -compatibility_version 1 -current_version 1.0 -Wl,-single_module
big sur:
/usr/bin/clang -dynamiclib                                   -o .libs/libpyglib-2.0-python2.7.0.dylib  .libs/libpyglib_2_0_python2.7_la-pyglib.o   -L/opt/local/lib -lgobject-2.0 -lgthread-2.0 -lglib-2.0 -lintl -lffi  -Os -arch x86_64 -Wl,-headerpad_max_install_names -Wl,-syslibroot -Wl,/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk -arch x86_64 -Wl,-framework -Wl,CoreFoundation   -install_name  /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/libpyglib-2.0-python2.7.0.dylib -compatibility_version 1 -current_version 1.0 -Wl,-single_module

[kencu (Ken)]

Yep, that has it:

% port -v installed py27-gobject
The following ports are currently installed:
  py27-gobject @2.28.7_1+x11 (active) platform='darwin 20' archs='x86_64' date='2020-11-21T15:16:10-0800'

[kencu (Ken)]

In f2975d5bbbc2459c661905c5a850cc661fa32f55/macports-ports (master):

py-gobject: fix libtool's macOS 11+ bug

closes: #61591