artemp/trac2github — Issue #381: Mac builds link to wrong Python binaries
Author: artemp
Created: 2011-10-09 20:30:57+00:00
State: open
Labels: Scons_Build_Scripts

I was getting a bus error when loading Mapnik into the standard Leopard Python 2.5.

{{{
% which python
/usr/bin/python
% python
Python 2.5.1 (r251:54863, Feb 6 2009, 19:02:12)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import mapnik
Bus error
}}}

The stack trace showed:

{{{
Process: Python [9129]
Path: /System/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: tcsh [81490]

Interval Since Last Report: 559 sec
Crashes Since Last Report: 2
Per-App Interval Since Last Report: 0 sec
Per-App Crashes Since Last Report: 2

Date/Time: 2009-07-08 16:54:43.456 -0700
OS Version: Mac OS X 10.5.7 (9J61)
Report Version: 6
Anonymous UUID: CCDA1631-26C1-4F73-AD03-C2A3B4FD4F07

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000028
Crashed Thread: 0

Thread 0 Crashed:
0 org.python.python	0x004cbfa1 PyErr_Occurred + 17
1 _mapnik.so	0x01072a29 boost::python::len(boost::python::api::object const&) + 33 (object.hpp:21)
2 ...python-xgcc40-mt-1_39.dylib	0x002991bc boost::python::objects::function_doc_signature_generator::function_doc_signatures(boost::python::objects::function const*) + 284 (function_doc_signature.cpp:288)
3 ...python-xgcc40-mt-1_39.dylib	0x00285f97 function_get_doc + 39 (object_operators.hpp:71)
4 org.python.python	0x0012e688 PyDictProxy_New + 2768
5 org.python.python	0x0014d942 PyObject_GenericGetAttr + 780
6 org.python.python	0x0014d12a PyObject_GetAttrString + 70
7 org.python.python	0x0012e1dd PyDictProxy_New + 1573
8 org.python.python	0x0015e58e PyType_IsSubtype + 1288
9 org.python.python	0x00121505 PyObject_Call + 50
10 org.python.python	0x001215d4 PyObject_Call + 257
11 org.python.python	0x00121643 PyObject_CallFunction + 74
12 ...python-xgcc40-mt-1_39.dylib	0x002843e6 boost::python::objects::class_base::add_property(char const*, boost::python::api::object const&, char const*) + 70 (errors.hpp:44)
13 _mapnik.so	0x010be66a boost::python::class_& boost::python::class_::add_property(char const*, double (mapnik::query::*)() const, char const*) + 74
14 _mapnik.so	0x010bd307 export_query() + 257
15 _mapnik.so	0x010b03d1 init_module__mapnik() + 45
16 ...python-xgcc40-mt-1_39.dylib	0x002906e9 boost::function0::operator()() const + 41 (function_template.hpp:989)
17 ...python-xgcc40-mt-1_39.dylib	0x0028fc3c boost::python::handle_exception_impl(boost::function0) + 204 (errors.cpp:25)
18 ...python-xgcc40-mt-1_39.dylib	0x00290ab0 boost::python::detail::init_module(char const*, void (*)()) + 160 (function_template.hpp:849)
19 _mapnik.so	0x010afec1 init_mapnik + 37 (mapnik_python.cpp:228)
20 org.python.python	0x001a35f1 _PyImport_LoadDynamicModule + 187
[...]

Binary Images:
0x1000 - 0x1ffe org.python.pythonapp 2.5.0 (2.5.0a0) <5aa9f0cc36fda395f965e08c96613cf5> /System/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python
0x49000 - 0x4afff readline.so ??? (???) <242a40e30d706dd854dfd70f6c6574d7> /System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/readline.so
0xbb000 - 0xbbffe dl.so ??? (???) /System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-dynload/dl.so
0x119000 - 0x1e5feb org.python.python 2.5 (2.5) <523ba54c654eeed6bc670db2f58a73ab> /System/Library/Frameworks/Python.framework/Versions/2.5/Python
0x232000 - 0x248fea libedit.2.dylib ??? (???) /usr/lib/libedit.2.dylib
0x272000 - 0x2a4fff +libboost_python-xgcc40-mt-1_39.dylib ??? (???) <9d0d3fadfcc63a263a5c6a3b7523a12d> /usr/local/lib/libboost_python-xgcc40-mt-1_39.dylib
0x2e9000 - 0x2ecffc libltdl.3.dylib ??? (???) <7eb66768e1abe38c3799255e56cf3693> /usr/lib/libltdl.3.dylib
0x2f2000 - 0x2f4ffb +libboost_system-xgcc40-mt-1_39.dylib ??? (???) /usr/local/lib/libboost_system-xgcc40-mt-1_39.dylib
0x400000 - 0x52affb +org.python.python 2.6.1, (c) 2004-2008 Python Software Foundation. (2.6.1) <97a408d2d126e7b1a8861dc789d78984> /Library/Frameworks/Python.framework/Versions/2.6/Python
0x5d7000 - 0x697ffb +com.kyngchaos.UnixImageIO 1.0.29 (UnixImageIO 1.0.29) <2bb05fd563367f1447de07c18af2e489> /Library/Frameworks/UnixImageIO.framework/Versions/B/UnixImageIO
0x6bd000 - 0x7b7fef +libicuuc.42.dylib ??? (???) <9a3c257721626f508497e0992b294ed7> /usr/local/lib/libicuuc.42.dylib
0x1000000 - 0x122cfff +_mapnik.so ??? (???) /Library/Python/2.5/site-packages/mapnik/_mapnik.so
0x1bc8000 - 0x1db2fff +libmapnik.dylib ??? (???) /usr/local/lib/libmapnik.dylib
[...]
}}}

It took me a while before I noticed both Python 2.5 and Python 2.6 were in the link list. I had once installed Python 2.6 from Python.org, but it was not the standard "python" executable on my path.

The problematic line in the build log is
{{{
g++ -o bindings/python/_mapnik.so -F/ -framework Python -bundle [...]
}}}

The -framework Python parameter is causing GCC to use /Library/Frameworks/Python.framework/Versions/Current instead of /System/Library/Frameworks/Python.framework/Versions/Current, which is the framework for /usr/bin/python.

I fixed my build problem by deleting the Python 2.6 framework and rebuilding Boost and Mapnik.

Admittedly, this is a configuration issue on my system, but it would be nice if Scons figured out somehow the proper version of the framework to link via the "python" executable rather than the "current" framework.