[PyKDE] Passing C++-created QWidgets to embedded Python

[Phil Thompson]

Robin Summerhill wrote:
> 
> I finally worked out what was going wrong here.
> 
> It's to do with the requirement to mark declarations with
> __declspec(DLLEXPORT) or _declspec(DLLIMPORT)to get DLL linking working
> properly with MSVC.
> 
> SIP_EXTERN is declared in sip.h and ends up as SIP_EXPORT or SIP_IMPORT
> according to whether the preprocessor symbols SIP_MAKE_DLL or SIP_USE_DLL
> are defined. Sip.exe uses this declaration to enable sip-generated headers
> to be used both in building the dll (EXPORT) and the client of the dll
> (IMPORT). However, the sip-generated headers that are included in the PyQT
> distribution have been edited to change SIP_EXTERN to SIP_EXPORT, meaning
> that these headers can only be used to build the libqtc dll, *not* consume
> it.
> 
> There is no clean way around this with the present setup, because SIP_EXTERN
> is used in the SIP headers too. You can't just change SIP_EXPORT back to
> SIP_EXTERN because that prevents you from building libqtc.

Hopefully fixed in 3.2 - but I haven't tested it. You won't need to
specify SIP_USE_DLL anymore - things "should just work".

If you are creating a module that %Imports the PyQt .sip files then you
will now need -DSIP_MAKE_MODULE_DLL in the CXXFLAGS.

Phil