Boost.Python linker errors

[kiseitai2]

Hello everyone,

I recently came across the Boost libraries and thought it would help me simplify my Python wrapper class (takes care of the embedding side). I spent 2 days trying to get the Boost libraries to compile under the MinGW toolset that came with Code::Blocks 12.11. The compilation was finally successful, but now my project can't compile. My project starts to throw "undefined reference to" linker errors when I attempt to use boost::python's functions (it doesn't if I'm simply declaring boost::python:: object objname). I'm using Boost 1.54.0, Win Vista, Python 2.7.5, and MinGW 4.7. Below is my compiler log:

Build started on: 18-07-2013 at 22:17.12
Build ended on: 18-07-2013 at 22:17.20
-------------- Build: default in Eureka (compiler: GNU GCC Compiler)---------------
mingw32-g++.exe -Wall -I"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Dev. libs\SDL-1.2.15\include\SDL" -I"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Dev. libs\SDL_mixer-1.2.12\include" -I"C:\Program Files\CodeBlocks\MinGW\include" -IC:\boost_1_54_0 -I"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Engine_Eureka\libPywrap" -Ic:\Python27\include -c C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\main.cpp -o obj\main.o
C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\main.cpp:71:4: warning: "/*" within comment [-Wcomment]
In file included from C:\boost_1_54_0/boost/python/object/make_instance.hpp:9:0,
from C:\boost_1_54_0/boost/python/object/make_ptr_instance.hpp:8,
from C:\boost_1_54_0/boost/python/to_python_indirect.hpp:11,
from C:\boost_1_54_0/boost/python/converter/arg_to_python.hpp:10,
from C:\boost_1_54_0/boost/python/call.hpp:15,
from C:\boost_1_54_0/boost/python/object_core.hpp:14,
from C:\boost_1_54_0/boost/python/args.hpp:25,
from C:\boost_1_54_0/boost\python.hpp:11,
from C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\conversion.h:4,
from C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\data_base.h:6,
from C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\physics.h:3,
from C:\Users\HOMEDIR\Documents\DevCB\Engine_Eureka\main.cpp:6:
C:\boost_1_54_0/boost/python/object/instance.hpp:14:36: warning: type attributes ignored after type is already defined [-Wattributes]
mingw32-g++.exe -L"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Dev. libs\SDL-1.2.15\lib" -L"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Dev. libs\SDL_mixer-1.2.12\lib\x86" -L"C:\Program Files\CodeBlocks\MinGW\lib" -LC:\boost_1_54_0\stage\lib -L"C:\Users\HOMEDIR\Documents\Dev-Cpp Projects\Engine_Eureka\libPywrap" -Lc:\Python27\libs -o bin\Eureka.exe obj\conversion.o obj\data_base.o obj\main.o obj\physics.o obj\pywrap.o -lmingw32 -lSDLmain -lSDL.dll -lSDL_mixer -lboost_python-mgw47-mt-s-1_54 -lpython27
obj\pywrap.o: In function `ZN6PywrapC2EPKc':
C:/Users/HOMEDIR/Documents/DevCB/Engine_Eureka/pywrap.cpp:23: undefined reference to `_imp___ZN5boost6python6importENS0_3strE'
obj\pywrap.o: In function `ZN6Pywrap13exec_FullFileEv':
C:/Users/HOMEDIR/Documents/DevCB/Engine_Eureka/pywrap.cpp:48: undefined reference to `_imp___ZN5boost6python6importENS0_3strE'
C:/Users/HOMEDIR/Documents/DevCB/Engine_Eureka/pywrap.cpp:50: undefined reference to `_imp___ZN5boost6python9exec_fileENS0_3strENS0_3api6objectES3_'
obj\pywrap.o: In function `ZN5boost6python9converter13arg_to_pythonIcEC1ERKc':
C:/boost_1_54_0/boost/python/converter/builtin_converters.hpp:160: undefined reference to `_imp___ZN5boost6python9converter19do_return_to_pythonEc'
obj\pywrap.o: In function `ZN5boost6python3api24const_attribute_policies3getERKNS1_6objectEPKc':
C:/boost_1_54_0/boost/python/object_attributes.hpp:74: undefined reference to `_imp___ZN5boost6python3api7getattrERKNS1_6objectEPKc'
obj\pywrap.o: In function `ZN5boost6python3api19const_item_policies3getERKNS1_6objectES5_':
C:/boost_1_54_0/boost/python/object_items.hpp:68: undefined reference to `_imp___ZN5boost6python3api7getitemERKNS1_6objectES4_'
obj\pywrap.o: In function `ZN5boost6python3lenERKNS0_3api6objectE':
C:/boost_1_54_0/boost/python/object.hpp:21: undefined reference to `_imp___ZN5boost6python23throw_error_already_setEv'
obj\pywrap.o: In function `ZN5boost6python4listC1Ev':
C:/boost_1_54_0/boost/python/list.hpp:61: undefined reference to `_imp___ZN5boost6python6detail9list_baseC2Ev'
obj\pywrap.o: In function `ZN5boost6python3strC1EPKc':
C:/boost_1_54_0/boost/python/str.hpp:150: undefined reference to `_imp___ZN5boost6python6detail8str_baseC2EPKc'
obj\pywrap.o: In function `ZN5boost6python15expect_non_nullI7_objectEEPT_S4_':
C:/boost_1_54_0/boost/python/errors.hpp:45: undefined reference to `_imp___ZN5boost6python23throw_error_already_setEv'
obj\pywrap.o: In function `ZN5boost6python4list6appendIiEEvRKT_':
C:/boost_1_54_0/boost/python/list.hpp:72: undefined reference to `_imp___ZN5boost6python6detail9list_base6appendERKNS0_3api6objectE'
obj\pywrap.o: In function `ZN5boost6python4list6appendISsEEvRKT_':
C:/boost_1_54_0/boost/python/list.hpp:72: undefined reference to `_imp___ZN5boost6python6detail9list_base6appendERKNS0_3api6objectE'
obj\pywrap.o: In function `ZN5boost6python4list6appendIcEEvRKT_':
C:/boost_1_54_0/boost/python/list.hpp:72: undefined reference to `_imp___ZN5boost6python6detail9list_base6appendERKNS0_3api6objectE'
obj\pywrap.o: In function `ZN5boost6python4list6appendIdEEvRKT_':
C:/boost_1_54_0/boost/python/list.hpp:72: undefined reference to `_imp___ZN5boost6python6detail9list_base6appendERKNS0_3api6objectE'
obj\pywrap.o: In function `ZN5boost6python9converter14extract_rvalueIiEC2EP7_object':
C:/boost_1_54_0/boost/python/extract.hpp:166: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage1EP7_objectRKNS1_12registrationE'
obj\pywrap.o: In function `ZNK5boost6python9converter14extract_rvalueIiEclEv':
C:/boost_1_54_0/boost/python/extract.hpp:186: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage2EP7_objectRNS1_30rvalue_from_python_stage1_dataERKNS1_12registrationE'
obj\pywrap.o: In function `ZN5boost6python9converter14extract_rvalueIcEC2EP7_object':
C:/boost_1_54_0/boost/python/extract.hpp:166: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage1EP7_objectRKNS1_12registrationE'
obj\pywrap.o: In function `ZNK5boost6python9converter14extract_rvalueIcEclEv':
C:/boost_1_54_0/boost/python/extract.hpp:186: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage2EP7_objectRNS1_30rvalue_from_python_stage1_dataERKNS1_12registrationE'
obj\pywrap.o: In function `ZN5boost6python9converter14extract_rvalueISsEC2EP7_object':
C:/boost_1_54_0/boost/python/extract.hpp:166: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage1EP7_objectRKNS1_12registrationE'
obj\pywrap.o: In function `ZNK5boost6python9converter14extract_rvalueISsEclEv':
C:/boost_1_54_0/boost/python/extract.hpp:186: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage2EP7_objectRNS1_30rvalue_from_python_stage1_dataERKNS1_12registrationE'
obj\pywrap.o: In function `ZN5boost6python9converter14extract_rvalueIdEC2EP7_object':
C:/boost_1_54_0/boost/python/extract.hpp:166: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage1EP7_objectRKNS1_12registrationE'
obj\pywrap.o: In function `ZNK5boost6python9converter14extract_rvalueIdEclEv':
C:/boost_1_54_0/boost/python/extract.hpp:186: undefined reference to `_imp___ZN5boost6python9converter25rvalue_from_python_stage2EP7_objectRNS1_30rvalue_from_python_stage1_dataERKNS1_12registrationE'
obj\pywrap.o: In function `ZN5boost6python9converter6detail16registry_lookup2IVKiEERKNS1_12registrationEPFRT_vE':
C:/boost_1_54_0/boost/python/converter/registered.hpp:87: undefined reference to `_imp___ZN5boost6python9converter8registry6lookupENS0_9type_infoE'
obj\pywrap.o: In function `ZN5boost6python9converter6detail16registry_lookup2IVKcEERKNS1_12registrationEPFRT_vE':
C:/boost_1_54_0/boost/python/converter/registered.hpp:87: undefined reference to `_imp___ZN5boost6python9converter8registry6lookupENS0_9type_infoE'
obj\pywrap.o: In function `ZN5boost6python9converter6detail16registry_lookup2IVKSsEERKNS1_12registrationEPFRT_vE':
C:/boost_1_54_0/boost/python/converter/registered.hpp:87: undefined reference to `_imp___ZN5boost6python9converter8registry6lookupENS0_9type_infoE'
obj\pywrap.o: In function `ZN5boost6python9converter6detail16registry_lookup2IVKdEERKNS1_12registrationEPFRT_vE':
C:/boost_1_54_0/boost/python/converter/registered.hpp:87: undefined reference to `_imp___ZN5boost6python9converter8registry6lookupENS0_9type_infoE'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 8 seconds)
26 errors, 2 warnings (0 minutes, 8 seconds)

*Note: I changed the name of the user directory to HOMEDIR

I am lost on what to do as I have added all of the search paths needed to find the libraries and includes. I double checked that libraries weren't duplicated in the compilation process. I also attempted to compile by duplicating the -llibboost_pytho n-etc.a to see what it would do and I got the same errors. I have linked to Python with no issues. I even attempted to build the project with BJam instead, but bjam says "...found 2 targets..." and quits. As a result, I don't know if the project could actually work via BJam. I have spent a minimum of a day looking through forums and attempting all sorts of ideas in old posts. I found two questions on this forum, but they were unanswered. I hope someone wih experience in Boost could point to some silly mistake I made. Thank you for yor time and help.

[kiseitai2]

I feel bad for not updating this thread and closing it. Throughout the year since I posted the question, I decided to add the interpreted using my understanding of the Python documentation. Thus, I dropped my usage of boost altogether and relied on SWIG to create the Python-side hooks. I have not tested the SWIG generated modules, but my integration of the interpreter seems to work on simple test cases. I am closing this old question as soon as I figure out how.