[CMake] Linking boost python with mingw

[Christiaan Putter]

Thanks Pau,   I'll build Python with mingw and give it a try.

I'll let you guys know how that worked out...

Have a  nice evening.


On 13/11/2007, Pau Garcia i Quiles <pgquiles at elpauer.org> wrote:
>
> Quoting Christiaan Putter <ceputter at googlemail.com>:
>
> (Returning this to the mailing list, as you mistakenly replied to me
> in private)
>
> > Hi Pau,
> >
> > Thanks for the swift reply.
> >
> > From the boost website page on building boost there's a section on
> Mingw,
> > quoting:
> >
> > "If you are using a version of Python prior to 2.4.1 with a MinGW prior
> to
> > 3.0.0 (with binutils-2.13.90-20030111-1), you will need to create a
> > MinGW-compatible version of the Python library; the one shipped with
> Python
> > will only work with a Microsoft-compatible linker..."
> >
> > The mingw site says something similar.
> >
> > I assumed this meant that using an up to date version of python (2.5)
> and
> > mingw meant it should work 'out of the box'.
>
> No, it means Python sources since 2.4 do not need to be patched to
> build with MinGW:
> http://www.mingw.org/MinGWiki/index.php/Python extensions
>
> > I forgot to mention though that I'm embedding pyhton into c++, so
> compiling
> > a normal c++ executable.  Also, like I said, compiling and linking
> something
> > using only the python25 lib works.  I'm getting errors when linking to
> my
> > boost.python libs.
>
> Most probably your problem is due to different call conventions being
> used (__stdcall and __cdecl). Read about that here:
> http://www.geocities.com/yongweiwu/stdcall.htm
>
> Either you build Python with MinGW, then try to link and make sure you
> are providing all the libraries you need, or you try to create your
> own import libraries for VC++-compiled Python. I'd go for the former,
> as it will be easier.
>
> > In case someone else is following this thread that wants to extend
> python:
> >
> > If you're compiling python code with mingw you'll have to tell it to use
> > mingw
> > ie. something like: python setup.py build --compiler=mingw32
> > There's a nice tutorial at
> > http://boodebr.org/main/python/build-windows-extensions
> >
> > I don't know if this is applicable to embedding too.
>
> I have never embedded Python in an application and hardly programmed
> anything in Python ever. I'm a Ruby guy.
>
> > Am I correct in assuming this Pau?
> >
> >
> > On 12/11/2007, Pau Garcia i Quiles <pgquiles at elpauer.org> wrote:
> >>
> >> Quoting Christiaan Putter <ceputter at googlemail.com>:
> >>
> >> Are you using a mingw-compiled Python? In case you are using a
> >> VC++-compiled version of Python (which is the one you download from
> >> python.org), have you created import libraries for MinGW?
> >>
> >> > Hi guys and girls,
> >> >
> >> > I'm new to this wonderful CMake thingy and I'm having some problems
> >> linking
> >> > to boost.python.
> >> >
> >> > My setup on windows xp:
> >> >
> >> > mingw       5.1.3  (with gcc 3.4.5)
> >> > boost        1.34.1
> >> > python      2.5
> >> >
> >> > I compiled boost as per instructions with mingw without any problems.
> >> >
> >> > With some simple code using boost/python I can compile without
> errors,
> >> but
> >> > when ld tries linking I get "undefined reference to '_imp____  ...."
> >> errors.
> >> >
> >> > In my CMakeLists file I have
> >> >
> >> > TARGET_LINK_LIBRARIES(${EXE_NAME}
> >> >         ${BOOST_PYTHON_LIB}
> >> >         ${PYTHON_LIBRARIES}
> >> >     )
> >> >
> >> > With the BOOST_PYTHON_LIB pointing directly to
> >> > C:/Boost/lib/libboost_python-mgw34-1_34_1.a
> >> >
> >> > Removing code using boost.python stuff and just using the normal
> python
> >> lib
> >> > compiles and links fine.
> >> >
> >> > What am I doing wrong?  I've tried every version of the boost_python
> lib
> >> by
> >> > the way, -mt, -s, -d, and combinations thereof.  Which one should I
> use,
> >> is
> >> > there a way to chose the correct library automatically, the
> >> > FindBoost.cmakeinclude doesn't seem to do it.
> >> >
> >> > And what exactly is the -s library for? I though lib*.a files were
> >> already
> >> > static?
> >> >
> >> > If anyone out there has gotten boost.python to work with mingw please
> >> let me
> >> > in on your secrets.  Any suggestions are welcome...
> >> >
> >> > Have a nice day,
> >> > cputter
> >> >
> >>
> >>
> >>
> >> --
> >> Pau Garcia i Quiles
> >> http://www.elpauer.org
> >> (Due to my workload, I may need 10 days to answer)
> >>
> >> _______________________________________________
> >> CMake mailing list
> >> CMake at cmake.org
> >> http://www.cmake.org/mailman/listinfo/cmake
> >>
> >
>
>
>
> --
> Pau Garcia i Quiles
> http://www.elpauer.org
> (Due to my workload, I may need 10 days to answer)
>
>
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