Porting to python3

[triplus]

Some issues will for sure emerge, when it comes to FreeCAD 0.18 Py3 builds. But i don't know if it makes sense to worry about that too much for now.

[reox]

I'm attempting to build the py3-27 version, but no-luck. It fails when attempting to link the libSMESH.so library (see below). I was able ot compile the py3-26 version.

You need to use mpic++ as your CXX compiler, so e.g. add this flag to cmake:

-DCMAKE_CXX_COMPILER=/usr/bin/mpic++

Is it really necessary to use a MPI compiler? I usually compile with a normal gcc and it seems to work.
Would the MPI compiler just add the parallelism?

sorry to excavate the thread here, but I did not wanted to create a new one

[vocx]

...
sorry to excavate the thread here, but I did not wanted to create a new one

You are reading old information.

This flag is not needed. If you have all requisites you only need this line to configure the build.

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cmake -DBUILD_QT5=ON -DPYTHON_EXECUTABLE=/usr/bin/python3 freecad-source

CompileOnUnix

[reox]

CompileOnUnix

okay thanks for the clarification! I was just consolidating old buildscripts and saw that some used mpic++

[iplayfast]

I'm trying to build, and was successful when I didn't worry about python3, Now trying with python 3 using the following cmake

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 cmake .. -DBUILD_QT5=ON -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_VERSION=3.6 -DFREECAD_USE_PCL=ON 

I'm getting a lot of errors related to PyString which google says is python2 only.
The errors thus far are in cxx_extensions.cxx

Is there a workaround for this?

*edit*
I just added #error codes and it shows that it is definitely trying to compile for python2, when I asked for python3. So how to I insist on python3?

[PrzemoF]

What system? Clean directory build? Source repository updated recently? Can you post full cmake output (configuration stage)?

[iplayfast]

clean directory build (mkdir build, cd build, cmake .. style) , linux.

I just did a

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make VERBOSE=1 >out.txt

and it shows the following:

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cd /home/chris/github/freecad-source/build/src/Base && /usr/bin/c++  -DFreeCADBase_EXPORTS -DHAVE_CONFIG_H -DHAVE_SWIG=1 -DQT_CORE_LIB -DQT_NO_DEBUG -D_OCC64 -DvtkFiltersFlowPaths_AUTOINIT="1(vtkFiltersParallelFlowPaths)" -DvtkIOExodus_AUTOINIT="1(vtkIOParallelExodus)" -DvtkIOGeometry_AUTOINIT="1(vtkIOMPIParallel)" -DvtkIOImage_AUTOINIT="1(vtkIOMPIImage)" -DvtkIOParallel_AUTOINIT="1(vtkIOMPIParallel)" -DvtkIOSQL_AUTOINIT="2(vtkIOMySQL,vtkIOPostgreSQL)" -DvtkRenderingContext2D_AUTOINIT="1(vtkRenderingContextOpenGL)" -DvtkRenderingCore_AUTOINIT="3(vtkInteractionStyle,vtkRenderingFreeType,vtkRenderingOpenGL)" -DvtkRenderingFreeType_AUTOINIT="2(vtkRenderingFreeTypeFontConfig,vtkRenderingMatplotlib)" -DvtkRenderingLIC_AUTOINIT="1(vtkRenderingParallelLIC)" -DvtkRenderingVolume_AUTOINIT="1(vtkRenderingVolumeOpenGL)" -I/home/chris/github/freecad-source/build -I/usr/include/vtk-6.3 -I/usr/include/freetype2 -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi/opal/mca/event/libevent2022/libevent -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi/opal/mca/event/libevent2022/libevent/include -I/usr/lib/x86_64-linux-gnu/openmpi/include -I/usr/include/python2.7 -I/usr/include/hdf5/openmpi -I/usr/include/libxml2 -I/usr/include/jsoncpp -I/usr/include/tcl -I/home/chris/github/freecad-source/build/src -I/home/chris/github/freecad-source/src -I/home/chris/github/freecad-source/build/src/Base -I/home/chris/github/freecad-source/src/Base -I/usr/include/python3.6m -isystem /usr/include/x86_64-linux-gnu/qt5 -isystem /usr/include/x86_64-linux-gnu/qt5/QtCore -isystem /usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++  -Wall -Wextra -Wno-write-strings  -fPIC   -I/usr/include/openmpi -I/usr/include/hdf5/openmpi -pthread -I/usr/lib/x86_64-linux-gnu/openmpi/include -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi -fPIC -std=gnu++11 -o CMakeFiles/FreeCADBase.dir/__/CXX/cxx_extensions.cxx.o -c /home/chris/github/freecad-source/src/CXX/cxx_extensions.cxx
src/Base/CMakeFiles/FreeCADBase.dir/build.make:213: recipe for target 'src/Base/CMakeFiles/FreeCADBase.dir/__/CXX/cxx_extensions.cxx.o' failed

Note -I/usr/include/python2.7 AND -I/usr/include/python3.6m
I think this is where the problem lies. where is the python2.7 coming from?

[iplayfast]

What system? Clean directory build? Source repository updated recently? Can you post full cmake output (configuration stage)?

cmake output attached

[wmayer]

Looks like it's pulled in by a third party library -- possibly by the vtkPython component. What's the content of vtkPython.cmake (you may find it under /usr/lib/cmake/vtk-6.3/Modules)?

In case you don't need the python2.7-dev package for anything else then it's best to uninstall it.

[PrzemoF]

Shiboken2Config: Using default python: -python2.7.x86_64-linux

What shiboken do you have installed?