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From: Chris Barker <chris.bar...@noaa.gov>
Date: Wed, 3 Oct 2012 09:10:53 -0700
Local: Wed, Oct 3 2012 12:10 pm
Subject: Re: [cython-users] Cython and linking to multiple DLLs
On Wed, Oct 3, 2012 at 7:21 AM, Brad Buran <bbu...@gmail.com> wrote:
Wow! this is pretty painful for a binary-only proprietary library (I'm
> I'm trying to write a Cython wrapper around a library for reading from a > (proprietary) binary file format. The vendor has released versions of the > library (called "MCStream" on Linux and "MC_StreamAnsiLib" on Windows) > compiled for Linux and Windows. I've been able to successfully get the > Cython wrapper working under Linux; however, the version of the vendor's > library for Windows is linked against the boost C++ library. Hence, I need > to compile the boost library on Windows for linking. assuming you do not get the source code so that you could re-compile the lib yourself?) > I was able to successfully do this and compile/link a test C++ file with the
that does seem likely but probaly not your issue anyway...
> MCStream library and the boost libraries, but only when using Microsoft > Visual Studio 10. Based on what I understand from various newsgroups, the > boost library must be compiled/linked using the same version of MS Visual > Studio that MCStream was compiled under. > However, I understand that Cython uses Visual Studio 9 (at least that's the
To be clear, it is not Cython that uses an particular version of a
> default executable used when I run "python setup.py build_ext --inplace"). compiler, it is distutils, which is designed to compile Python extensions with the same compiler that python itself was built with. The Python binaries distributed by python.org were built with particular versions (usually a bit old) 2.7 was built with VS2008, for instance (is that the same as 9? -- the dula naming conversion drives me crazy!) > Consequently, I get a lot of "unresolved external symbol" errors that are
HMM -- if I have this right: MCStream uses Boost (or some of it,
> associated with the failure to properly link the boost libraries with the > MCStream executable. anyway). But that should be independent of your Cython code -- it should be calling the MCStream API directly (or are there data types, etc, provided by Boost that you need to use to call MCStream?) Anyway -- while distutils, by default, uses the compiler PYthon was
I'm not sure how to force distutils to use a different one, but I'd
You may also be abel to make a little layer: put the boost stuff in a
A final option is to re-compile Python itself with VS 9 -- then it'll
> below, actual error is at the bottom). As you can see, the error relates to
I don't know if minGW is ABI-compatible with MS VS for C++ (it does
> it being unable to find the references defined in the MCStream library; work for C, but there is no standard ABI for C++) HTH,
-- Christopher Barker, Ph.D.
Emergency Response Division
Chris.Bar...@noaa.gov
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