Re: [Mingw-users] *.so vs. DLL

[Reinhard N. <rei...@pr...>]

Reinhard Nadrchal wrote:
> Hi all,
> 
> I'm porting Python extensions (using the CXX API) from unix *.so files 
> to DLLs using MinGW. My problem is that although compilation and linking 
> works fine, the Python interpreter complains when importing the DLLs 
> (i.e. it crashes). Is there something special about Windows DLLs I have 
> to take into account.
> 
> By the way, a second question. Can I simply compile my static unix 
> libraries int *.lib files and link them?
> 
> reinhard
> 
> 
> 
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I don't make any progress with the hints provided so for, so let me 
state the problem differently:

As I've explained previously we have to port python extension modules 
(making heavy use of STL) from Unix/Linux to Windows. I guess the MinGW 
linker links stdc++ code statically (using libstdc++.a). To avoid 
resource conflicts we linked a dynamic version (libstdc++.so) on Unix 
platforms. If we try the same under Windows (namly producing a 
libstdc++.dll by converting the libstdc++ using ar and dllwrap) and 
making the python extension module (as a DLL file), one of two things 
happens: either the python interpreter complains if our libstdc++.dll is 
not in the path, or it crashes if we naivly make it available to python.

1. Can you think of some (maybe obvious) reason for this?
2. How to use a dynamic version of libstdc++ (usage of 
__declspec(dllexport) for libstc++)
3. How to make use of *.def files produced with dllwrap?
4. Is it necessary to dynamically link libstdc++ under Windows in order 
to avoid conflicts (e.g. opening I/O channels)

Sorry for getting on your nerves and thanks in advance,

reinhard