[PyQt] Linking Qt statically into a project using embedded Python and Sip/PyQt

[Ulrich Berning]

George Goussard wrote:

> Hello.
>
> My project that I am currently working on is a cross-platform C++ 
> project. On Linux 32-bit/64-bit I have the constraint that I MUST link 
> Qt (4.3.3) in statically with the project. This is a given and cannot 
> be compromised. I have successfully embedded Python into our 
> application and with this facility I can run external Python *.py 
> files. With the help of Sip/PyQt used in these *.py files I can route 
> the output to a nice window inside my Qt application etc. etc. 
> But,....the problem is that it only works if I link Qt in dynamically 
> to my application.
>
> The reason(I think – when I link dynamically to Qt) is because my 
> application loads the Qt *.so file dynamically when I startup the 
> application. Then when the application runs an external *.py file and 
> it has the line “from PyQt import QtCore” then I suppose that it sees 
> the *.so is already loaded and uses it. Now my question: How can I 
> either get the Python mechanism or Sip/PyQt to rather use the 
> statically linked in Qt with my project?
>
> Currently, if I link Qt statically into my application and run the 
> *.py files I get some strange Qt message on the command line and then 
> it crashes.
>
> George.
>
The only way to do this, is to have everything statically linked:
- Build a static Python library
- Build a static SIP library
- Build static PyQt libraries

Use PyImport_ExtendInittab() to declare the module initialization 
functions for SIP and all PyQt modules you need in your application. 
This must be done before you initialize the python interpreter with 
Py_Initialize().

Ulli