Building Python with VC8 on x64 Vista

[danfike at gmail.com]

On Sep 20, 9:45 am, danf... at gmail.com wrote:
> Hi all,
>
> So I'm working on a C++ application that will eventually embed or
> extend Python using Boost.Python, but I first need to get Python
> compiled correctly for my platform. I've got a Windows Vista 64-bit
> machine with a Core 2 processor, and I'm compiling with a VC8.
>
> I downloaded the Python 2.5.1 source from python.org, and I opened the
> Visual Studio solution file that was in the PCbuild8 directory. I
> created a new x64 platform and managed to successfully compile the
> 'pythoncore' and 'python' projects (both in Debug and Release
> configurations), resulting in working executables. (Aside: When
> launched, the python console says "Python 2.5.1 [MSC v.1400 64 bit
> (AMD64)] on win32" up top. Does that seem right?)
>
> So, this program I'm writing with Boost.Python (that worked correctly
> on x86 with home-built libraries) won't compile with these x64
> libraries. I keep getting 'unresolved external symbols.' But, I'm
> certain I'm linking in the library correctly. Here's a snippet from
> the output (with /verbose:lib) when compiling:
>
> 1>Searching libraries
> 1>    <snip>
> 1>    Searching ..\..\..\3rdParty\boost_1_34_0\lib_x64\libboost_python-
> vc80-mt-gy-1_34.lib:
> 1>    <snip>
> 1>    Searching ..\..\..\3rdParty\Python25\libs_x64\python25_d.lib:
> 1>Finished searching libraries
> 1>py_dyn_test.obj : error LNK2001: unresolved external symbol
> _Py_NoneStruct
> 1>vector_py.obj : error LNK2001: unresolved external symbol
> _Py_NoneStruct
> 1>volume_py.obj : error LNK2001: unresolved external symbol
> _Py_NoneStruct
> 1>py_dyn_test.obj : error LNK2001: unresolved external symbol
> _Py_RefTotal
> 1>vector_py.obj : error LNK2001: unresolved external symbol
> _Py_RefTotal
> 1>volume_py.obj : error LNK2001: unresolved external symbol
> _Py_RefTotal
> 1>volume_py.obj : error LNK2001: unresolved external symbol
> PyExc_IndexError
>
> If I switch to the Release configuration, I see fewer errors:
>
> 1>py_dyn_test.obj : error LNK2001: unresolved external symbol
> _Py_NoneStruct
> 1>volume_py.obj : error LNK2001: unresolved external symbol
> PyExc_IndexError
>
> Note that none of my own code is Debug-specific. Also, the code in my
> files is correct, because (as stated above), it worked fine for x86.
>
> Though I don't know how useful it is, I did open the python libraries
> in wordpad, and though most of the file wasn't legible, I did find
> strings "Py_NoneStruct," "Py_RefTotal," and "PyExc_IndexError."
>
> I suspect that I set up my "x64" platform configuration incorrectly,
> or missed something. It's basically the same as the Win32
> configuration, except with the /MACHINE:X64 flag instead of /
> MACHINE:X86. One of the things I'm noticing just now, as I post this,
> is that the preprocessor flag "WIN32" is still defined in the x64
> configuration. Maybe if I change that to "WIN64," I'll have better
> luck.
>
> Any advice you have on what the "correct" way to do this is would be
> appreciated.
>
> -Dan

I've tried re-building my libraries from the latest revision (58225),
using the solution in the PCbuild8 folder. I had no problems getting
the python25[_d].lib to compile, but I still get these symbol errors
when I try to link with the library.

-Dan