[PyQt] Empty bindings...what am I doing wrong?

[Phil Thompson]

On 20 Feb 2017, at 8:35 pm, Shaheed Haque <srhaque at theiet.org> wrote:
> 
> Hi,
> 
> I'm making steady progress with my SIP binding generator, and am at
> the point where I can actually build the generated SIP and compile the
> resulting code into a .so file. The problem is that the .so file
> appears not to contain anything in the sense that Python cannot see
> any useful content:
> 
> ==========
> $ PYTHONPATH=tmp2/python python -c 'from PyKF5 import KGuiAddons;
> help(KGuiAddons)'
> Help on package PyKF5.KGuiAddons in PyKF5:
> 
> NAME
>    PyKF5.KGuiAddons
> 
> FILE
>    /home/srhaque/kdedev/frameworks-bindings/extra-cmake-modules/find-modules/module_generation/tmp2/python/PyKF5/KGuiAddons/__init__.py
> 
> PACKAGE CONTENTS
>    KGuiAddons
> ==========
> 
> I spent some time looking at the symbol table (nm -Ca
> .../KGuiAddons.so) and comparing it with examples from PyQt, and I see
> the expected _init(), initKGuiAddons() and other plausible looking
> stuff. I can only think that the options I am passing to SIP or
> possibly g++ are somehow incorrect, so here are some selected outputs
> to show the build procedure:
> 
> === RUN SIP ===
> /usr/bin/sip -c tmp2/tmp/PyKF5/KGuiAddons -b
> tmp2/tmp/PyKF5/KGuiAddons/module.sbf -e -o -w -X
> includes:tmp2/tmp/PyKF5/KGuiAddons/module.includes -x
> KGuiAddons_KGuiAddonsmod -x VendorID -t WS_X11 -t Qt_5_6_1 -x Py_v3
> -I/usr/share/sip/PyQt5 -Itmp
> tmp2/sip/PyKF5/KGuiAddons/KGuiAddonsmod.with_features.sip
> ==============
> 
> and then
> 
> === Run g++ ===
> make -f module.Makefile
> g++ -c -g -O2 -fstack-protector-strong -Wformat
> -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -Wall
> -W -DNDEBUG -I. -I/usr/include/KF5 -I/usr/include/KF5/KCoreAddons
> -I/usr/include/libxml2 -I/usr/include/x86_64-linux-gnu/qt5
> -I/usr/include/x86_64-linux-gnu/qt5/QtCore
> -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++-64
> -I/usr/include/KF5/KGuiAddons
> -I/usr/include/x86_64-linux-gnu/qt5/QtGui
> -I/usr/include/x86_64-linux-gnu/qt5/QtWidgets -I/usr/include/python2.7
> -o sipKGuiAddonscmodule.o sipKGuiAddonscmodule.cpp
> ...
> g++ -Wl,-Bsymbolic-functions -Wl,-z,relro -shared
> -Wl,--version-script=KGuiAddons.exp -o KGuiAddons.so
> sipKGuiAddonscmodule.o <other .o files>
> sipKGuiAddonsKColorCollection.o -l:libKF5IMAP.so <lots more libraries>
> -l:libKF5AkonadiSearchXapian.so
> ==========
> 
> Needless to say I've tried varying the command line to SIP, to no
> avail. Any clues or ideas as to what I'm missing would be most
> welcome.

The error handling in Python v2 on module creation is very poor. (Why are you even bothering with Python v2?) Your best bet is to put printf() calls in the generated module init code to see how far it is getting.

Phil