mixing PyQt(5) and Boost.Python

[Phil Thompson]

On 20/09/2021 20:49, Stefan Seefeld wrote:
> ...and a follow-up question:
> 
> My current C++ code looks (roughly) like this:
> 
> ---
> #include <sip.h>
> 
> extern const sipAPIDef *sipAPI_QtQml;
> extern sipClassTypeDef sipTypeDef_QtQml_QQmlApplicationEngine;
> 
> bpl::object get_pyqt_qml_engine(bpl::object &self)
> {
>   auto engine = 
> sipAPI_QtQml->qpi_convert_from_new_type(get_qml_engin(),
> &sipTypeDef_QtQml_QQmlApplicationEngine.ctd_base,
>                                                self.ptr())));
>   return bpl::objec(bpl::handle<>(engine));
> }
> ---
> 
> When I compile the above into my extension module and try to load
> (import) it into my Python process, I get a missing-symbol error for
> `sipTypeDef_QtQml_QQmlApplicationEngine`. Is there anything else I
> need to do to get this symbol to be properly resolved ?
> 
> (In fact, I notice that the symbol appears to be provided by the
> `PyQt.QtQml` module, so I'm importing this prior to importing the
> above.
> 
> I also tried setting the `os.RTLD_GLOBAL` loader flag, though that may
> actually result in ODR violations in other parts of the application...
> 
> Any advice on how to proceed ?

See...

https://www.riverbankcomputing.com/static/Docs/sip/c_api.html#using-the-c-api-when-embedding

Phil
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