Re: Python 3.8 porting help

[Petr Viktorin]

Victor, do you know the answer here?

Blender has the same issue: 
https://bugzilla.redhat.com/show_bug.cgi?id=1734980
(but I forgot to CC you there)


On 2019-09-24 14:57, Richard Shaw wrote:
> I maintain FreeCAD for Fedora and there appears to have been a change in 
> the API for how Python handles thread management in 3.8, specifically 
> PyInterpreterState which is giving the the following error when trying 
> to build FreeCAD:
> 
> In file included from 
> /builddir/build/BUILD/FreeCAD-0.18.3/src/Base/swigpyrun.cpp:41:
> /builddir/build/BUILD/FreeCAD-0.18.3/src/Base/swigpyrun.inl: In function 
> 'void Swig_python::cleanupSWIG_T(const char*)':
> /builddir/build/BUILD/FreeCAD-0.18.3/src/Base/swigpyrun.inl:75:31: 
> error: invalid use of incomplete type 'PyInterpreterState' {aka 'struct 
> _is'}
>     75 |     PyObject *modules = interp->modules;
>        |                               ^~
> In file included from /usr/include/python3.8/genobject.h:11,
>                   from /usr/include/python3.8/Python.h:121,
>                   from 
> /builddir/build/BUILD/FreeCAD-0.18.3/src/Base/PyExport.h:42,
>                   from 
> /builddir/build/BUILD/FreeCAD-0.18.3/src/Base/swigpyrun.cpp:25:
> /usr/include/python3.8/pystate.h:20:8: note: forward declaration of 
> 'PyInterpreterState' {aka 'struct _is'}
>     20 | struct _is;
>        |        ^~~
> 
> Any tips?
> 
> I can provide a full build log or setup a COPR but it's somewhat 
> difficult since I'm building a whole new stack of some dependencies:
> 
> Coin3->Coin4 (in review)
> - Which SoQt, SIMVoleon, OpenSceneGraph and Pivy need to be ported to.
> Pyside->PySide2 (which implies Qt4->Qt5)
> 
> Thanks,
> Richard
> 
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