[vtk-developers] Error building Python wrappings of member functions that return vtkVector2i/f with VS2010

[Takuya OSHIMA]

> I suspect that the only reason CMAKE_CXX_MP_FLAG=ON and
> CMAKE_CXX_MP_NUM_PROCESSORS=8 caused the problem to
> go away was that changing these caused a rebuild of the python
> wrappers.  I bet that if you change those flags back again, the
> problem will not return.

I should have mentioned that simply changing the flags and rebuilding
was not enough but a full clean rebuild had to be done. The problem
went away for me, but I am still a bit curious why CMAKE_CXX_MP_FLAG
changes the behavior of the wrapper.

> Tk is not required by the python build, so you are safe in turning off
> VTK_USE_TK.  It is only needed for the python vtkTkRenderWidget,
> a piece that is strictly optional.

Again thanks for the clarification.

Takuya

Takuya OSHIMA, Ph.D.
Faculty of Engineering, Niigata University
8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN

From: David Gobbi <david.gobbi at gmail.com>
Subject: Re: [vtk-developers] Error building Python wrappings of member functions that return vtkVector2i/f with VS2010
Date: Thu, 2 Jun 2011 21:13:40 -0600

> I suspect that the only reason CMAKE_CXX_MP_FLAG=ON and
> CMAKE_CXX_MP_NUM_PROCESSORS=8 caused the problem to
> go away was that changing these caused a rebuild of the python
> wrappers.  I bet that if you change those flags back again, the
> problem will not return.
> 
> Tk is not required by the python build, so you are safe in turning off
> VTK_USE_TK.  It is only needed for the python vtkTkRenderWidget,
> a piece that is strictly optional.
> 
>  - David
> 
> 
> On Thu, Jun 2, 2011 at 8:35 PM, Takuya OSHIMA
> <oshima at eng.niigata-u.ac.jp> wrote:
>> Thanks for the inputs. Exactly the same source tree (tree id 0017782)
>> was used and I was not able to find a meaningful difference in
>> relavant class entries (vtkFreeTypeStringToImage and vtkVector2i) in
>> *Hierarchy.txt.
>>
>> However with the comparison of the dashboard build configs and mine it
>> turned out that my settings of CMAKE_CXX_MP_FLAG=ON and
>> CMAKE_CXX_MP_NUM_PROCESSORS=8 which I thought were required to enable
>> a parallel build were causing the problem. With the variables unset
>> the build went fine.
>>
>> Also as a side note, turning VTK_WRAP_PYTHON on also automatically
>> turned on VTK_USE_TK, which caused a CMake error as I don't have any
>> of Tk libraries installed. However by manually turning off VTK_USE_TK
>> the CMake configuration and the building process went fine, and
>> further vtkpython is working fine. Is Tk really required for Python
>> wrapping?
>>
>> Takuya
>>
>> Takuya OSHIMA, Ph.D.
>> Faculty of Engineering, Niigata University
>> 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN
>>
>> There was no meaningful difference in the
>> relevant class entries of *Hierarchy.txt
>>
>> From: David Gobbi <david.gobbi at gmail.com>
>> Subject: Re: [vtk-developers] Error building Python wrappings of member functions that return vtkVector2i/f with VS2010
>> Date: Thu, 2 Jun 2011 07:37:10 -0600
>>
>>> The VTK dashboard tests the VTK 5.8 branch on VS2010 with
>>> Python every night and has never shown this issue.  On your
>>> system, the problem might be an incorrectly generated hierarchy file
>>> Filtering/vtkRenderingHierarchy.txt, can you open this file in an
>>> editor on both your Windows build and OS X build to see if the
>>> vtkVector2i entries are the same in each?
>>>
>>> Also, just to confirm, do your OS X build and VS2010 build use git
>>> checkouts from the same date?  Because the vtkVector header file was
>>> recently moved into the VTK/Common directory, and that is what most
>>> likely triggerred this issue.
>>>
>>>  - David
>>>
>>>
>>> On Thu, Jun 2, 2011 at 6:59 AM, Takuya OSHIMA
>>> <oshima at eng.niigata-u.ac.jp> wrote:
>>>> Hi,
>>>>
>>>> Trying to build VTK 5.8 branch head on a Windows7/VS2010 system with
>>>> Python wrapping ON, I am getting errors compiling Python-wrapper
>>>> generated code of class member functions that return vtkVector2i or
>>>> vtkVector2f objects.
>>>>
>>>> For example, in the Python-wrapper generated code of
>>>> vtkFreeTypeStringToImage, vtkFreeTypeStringToImagePython.cxx, a piece
>>>> of wrapping code for vtkFreeTypeStringToImage::GetBounds()
>>>>
>>>> static PyObject *
>>>> PyvtkFreeTypeStringToImage_GetBounds_s1(PyObject *self, PyObject *args)
>>>> {
>>>>  vtkPythonArgs ap(self, args, "GetBounds");
>>>>  vtkObjectBase *vp = ap.GetSelfPointer(self, args);
>>>>  vtkFreeTypeStringToImage *op = static_cast<vtkFreeTypeStringToImage *>(vp);
>>>>
>>>>  vtkTextProperty *temp0 = NULL;
>>>>  vtkUnicodeString temp1;
>>>>  vtkVector2i tempr;
>>>>  .....(snip).....
>>>>
>>>> invokes 'undefined type vtkVector2i' at the declaration of variable tempr.
>>>>
>>>> However, if I build the 5.8 branch head on OS X, the wrapping of
>>>> GetBounds() is omitted from the generated *Python.cxx and the whole
>>>> VTK builds fine.
>>>>
>>>> Any thoughts?
>>>>
>>>> Takuya
>>>>
>>>> Takuya OSHIMA, Ph.D.
>>>> Faculty of Engineering, Niigata University
>>>> 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN
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