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Linker errors when compiling for python, on Win7 with VS2010

 
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statrill



Joined: 24 Oct 2015
Posts: 5
PostPosted: Sat Oct 24, 2015 3:33 am    Post subject: Linker errors when compiling for python, on Win7 with VS2010 Reply with quote
I am trying to compile a x64 python 3.4 extension.

I have been running into numerous issues along the way (first needing to grab Visual Studio, as Mingw only compiles 32-bit, etc). I (finally) got the source to compile, but when I go to run
Code:
python setup.py install
, there are tons of unresolved dependencies.

I had to modify the setup file so it referenced a *.lib file instead of a *.a file. Below is the new setup file:
Code:
from distutils.core import setup, Extension
from distutils import sysconfig
sysconfig.get_config_vars()["OPT"] = ''
sysconfig.get_config_vars()["CFLAGS"] = ''
setup(name="miniupnpc",
      version=open('VERSION').read().strip(),
      author='Thomas BERNARD',
      author_email='miniupnp@free.fr',
      license=open('LICENSE').read(),
      url='http://miniupnp.free.fr/',
      description='miniUPnP client',
      ext_modules=[
         Extension(name="miniupnpc", sources=["miniupnpcmodule.c"],
                   libraries=["ws2_32", "iphlpapi"],
                   extra_objects=[r"msvc\Release\upnpc-static.lib"])
      ])



My output from distutils:
Code:
C:\miniupnpc-1.9.20151008>python setupvs.py install
running install
running build
running build_ext
building 'miniupnpc' extension
C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Bin\amd64\cl.exe /c /nolo
go /Ox /MD /W3 /GS- /DNDEBUG -IC:\Python34\include -IC:\Python34\include /Tcmini
upnpcmodule.c /Fobuild\temp.win-amd64-3.4\Release\miniupnpcmodule.obj
miniupnpcmodule.c
C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\Bin\amd64\link.exe /DLL /
nologo /INCREMENTAL:NO /LIBPATH:C:\Python34\libs /LIBPATH:C:\Python34\PCbuild\am
d64 ws2_32.lib iphlpapi.lib /EXPORT:PyInit_miniupnpc build\temp.win-amd64-3.4\Re
lease\miniupnpcmodule.obj msvc\Release\upnpc-static.lib /OUT:build\lib.win-amd64
-3.4\miniupnpc.pyd /IMPLIB:build\temp.win-amd64-3.4\Release\miniupnpc.lib /MANIF
ESTFILE:build\temp.win-amd64-3.4\Release\miniupnpc.pyd.manifest
miniupnpcmodule.obj : warning LNK4197: export 'PyInit_miniupnpc' specified multi
ple times; using first specification
   Creating library build\temp.win-amd64-3.4\Release\miniupnpc.lib and object bu
ild\temp.win-amd64-3.4\Release\miniupnpc.exp
miniupnpcmodule.obj : error LNK2019: unresolved external symbol FreeUPNPUrls ref
erenced in function UPnPObject_dealloc
miniupnpcmodule.obj : error LNK2019: unresolved external symbol freeUPNPDevlist
referenced in function UPnPObject_dealloc
miniupnpcmodule.obj : error LNK2019: unresolved external symbol upnpDiscover ref
erenced in function UPnP_discover
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetValidIGD
 referenced in function UPnP_selectigd
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetTotalByt
esSent referenced in function UPnP_totalbytesent
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetTotalByt
esReceived referenced in function UPnP_totalbytereceived
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetTotalPac
ketsSent referenced in function UPnP_totalpacketsent
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetTotalPac
ketsReceived referenced in function UPnP_totalpacketreceived
miniupnpcmodule.obj : error LNK2019: unresolved external symbol strupnperror ref
erenced in function UPnP_statusinfo
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetStatusIn
fo referenced in function UPnP_statusinfo
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetConnecti
onTypeInfo referenced in function UPnP_connectiontype
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetExternal
IPAddress referenced in function UPnP_externalipaddress
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_AddPortMapp
ing referenced in function UPnP_addportmapping
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_AddAnyPortM
apping referenced in function UPnP_addanyportmapping
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_DeletePortM
apping referenced in function UPnP_deleteportmapping
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_DeletePortM
appingRange referenced in function UPnP_deleteportmappingrange
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetPortMapp
ingNumberOfEntries referenced in function UPnP_getportmappingnumberofentries
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetSpecific
PortMappingEntry referenced in function UPnP_getspecificportmapping
miniupnpcmodule.obj : error LNK2019: unresolved external symbol UPNP_GetGenericP
ortMappingEntry referenced in function UPnP_getgenericportmapping
build\lib.win-amd64-3.4\miniupnpc.pyd : fatal error LNK1120: 19 unresolved exter
nals
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 10.0\\VC\\Bin\\
amd64\\link.exe' failed with exit status 1120


Does anyone have any clue why the dependencies are unresolved? I wish this had more windows support, as this really looks to be a great library!

-Stat
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statrill



Joined: 24 Oct 2015
Posts: 5
PostPosted: Sat Oct 24, 2015 3:53 am    Post subject: Reply with quote
From looking around, it looks like the .lib and .obj files were already in the /build/temp..../Release directory, but using these in the setup.py file gives the same 19 unresolved externals as well.

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miniupnp
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Joined: 14 Apr 2007
Posts: 1594
PostPosted: Sun Oct 25, 2015 4:17 pm    Post subject: Reply with quote
If your code is using the static lib, make sure MINIUPNP_STATICLIB is defined :

sysconfig.get_config_vars()["CFLAGS"] = '-DMINIUPNP_STATICLIB'

I'm not using Windows myself, so I havent tested, but you should make sure that is OK.
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statrill



Joined: 24 Oct 2015
Posts: 5
PostPosted: Sun Oct 25, 2015 7:06 pm    Post subject: Reply with quote
miniupnp wrote:
If your code is using the static lib, make sure MINIUPNP_STATICLIB is defined :

sysconfig.get_config_vars()["CFLAGS"] = '-DMINIUPNP_STATICLIB'

I'm not using Windows myself, so I havent tested, but you should make sure that is OK.
Thanks much for a reply sir!

What do you mean when you say defined? Does MINIUPNP_STATICLIB have to be defined as a environment variable, or if you mean in code, where would it be defined? In the c++ portion, or in the python setup.py file? I don't even know how to check if it is defined Sad

I am not very good with c++, so please forgive me.
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miniupnp
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Joined: 14 Apr 2007
Posts: 1594
PostPosted: Sun Oct 25, 2015 7:52 pm    Post subject: Reply with quote
I mean through CFLAGS :
sysconfig.get_config_vars()["CFLAGS"] = '-DMINIUPNP_STATICLIB'

in MSVC project files there is PreprocessorDefinitions :
https://github.com/miniupnp/miniupnp/blob/master/miniupnpc/msvc/upnpc-static.vcproj#L44
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statrill



Joined: 24 Oct 2015
Posts: 5
PostPosted: Sun Oct 25, 2015 9:31 pm    Post subject: Reply with quote
Ahh, okay. If I open them up with VS2010, upnpc-static has all of the definitions in the link you posted. The miniupnpc project has only _CRT_SECURE_NO_WARNINGS;MINIUPNP_STATICLIB;%(PreprocessorDefinitions).

But yes, they both have MINIUPNP_STATICLIB defined. Both projects compile in VS2010 - but when I use the setup.py, everything falls apart :/

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miniupnp
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PostPosted: Sun Oct 25, 2015 10:44 pm    Post subject: Reply with quote
that's why I gave you the line to change in setup.py ...
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statrill



Joined: 24 Oct 2015
Posts: 5
PostPosted: Mon Oct 26, 2015 6:31 am    Post subject: Reply with quote
I just realized the misunderstanding - I was trying to compile in VS2010 and have python somehow build the extension from that; I just did some more reading and learned that the python build process compiles from scratch.

Anyway, I'm with you now. I defined the CFLAG, but I still get the 19 LNK2019s. My file now looks like this:

Code:
from distutils.core import setup, Extension
from distutils import sysconfig
sysconfig.get_config_vars()["OPT"] = ''
sysconfig.get_config_vars()["CFLAGS"]= '-DMINIUPNP_STATICLIB'
setup(name="miniupnpc",
      version=open('VERSION').read().strip(),
      author='Thomas BERNARD',
      author_email='miniupnp@free.fr',
      license=open('LICENSE').read(),
      url='http://miniupnp.free.fr/',
      description='miniUPnP client',
      ext_modules=[
         Extension(name="miniupnpc", sources=["miniupnpcmodule.c"],
                   libraries=["ws2_32", "iphlpapi"],
                   extra_objects=[r"msvc\Release\upnpc-static.lib"])
      ])


Let me ask this: if I already need to compile the project to produce the upnpcxxxx.lib file, why does python need to compile the sources a second time? And there were two projects in the solution, the upnpc-static project is the correct one to feed the extra_objects argument, above, right?

This is quite a learning adventure,
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miniupnp
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PostPosted: Mon Oct 26, 2015 9:14 am    Post subject: Reply with quote
I just don't know how building Python modules under Win32 works.
Everything works well under Linux and Mac OS X with the Makefile :
$ make installpythonmodule
and that's all Smile
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PostPosted: Thu Apr 26, 2018 9:25 pm    Post subject: Reply with quote
I have managed to get Appveyor build the python modules. get them here :
https://ci.appveyor.com/project/miniupnp/miniupnp/build/artifacts
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