[vtk-developers] Python Wrapping fails in master build.

[David Gobbi]

Thanks, Andrew.  So now we know that errno is EACCES, which corresponds to
a Windows filesystem error of ERROR_ACCESS_DENIED
or ERROR_SHARING_VIOLATION.  I strongly suspect the latter.

So there are two options:

1) retry a few times (e.g. 5 times over 5 seconds), in the hope that the
sharing violation will clear up, which it probably will because antivirus
software only takes a fraction of a second to scan a small file.

2) write to a temporary file which is then renamed to ..Python.cxx (in
which case the 'rename' operation has to retry if it encounters a sharing
violation).

The latter is what CMake does (its "cmSystemTools::RenameFile()" function
retries, so cmake doesn't seem to have any magic that makes retries
unnecessary).

I'm tempted to go with (1) due to its simplicity, and because if we used a
random temporary file we'd have to find some way to remove that file if
vtkWrapPython didn't exit cleanly.

 - David


On Thu, Sep 27, 2018 at 10:14 PM Andrew Maclean <andrew.amaclean at gmail.com>
wrote:

> Just did a build and I have one failure:
> [381/4832] Python Wrapping - generating vtkRungeKutta2Python.cxx
> FAILED: Wrapping/Python/vtkRungeKutta2Python.cxx
> cmd.exe /C "cd /D
> C:\Users\amaclean\Development\Kitware\build\VTK-Release\Wrapping\Python &&
> C:\Users\amaclean\Development\Kitware\build\VTK-Release\bin\vtkWrapPython-9.0.exe
> @C:/Users/amaclean/Development/Kitware/build/VTK-Release/Wrapping/Python/vtkCommonMathPython.Release.args
> -o
> C:/Users/amaclean/Development/Kitware/build/VTK-Release/Wrapping/Python/vtkRungeKutta2Python.cxx
> C:/Users/amaclean/Development/Kitware/src/VTK/Common/Math/vtkRungeKutta2.h"
> Error 13 opening output file
> C:/Users/amaclean/Development/Kitware/build/VTK-Release/Wrapping/Python/vtkRungeKutta2Python.cxx:
> Permission denied
>
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