CMake 3.17.2 to 3.18.4 update seems to have made all python tests fail?

Development
1

Hi all,

For weeks now, the dashboards I submit have been very non-green. There are a huge number of tests failing, just about all of them Python tests. ex: On Rogue14, things were ok on 2020-10-12 then ~700 test started failing the day after.

I keep a log of changes to my bots, and on 2020-10-12 that bot was updated from CMake 3.17.2 to 3.18.4. Presumably that was the cause.

Example error output:

Traceback (most recent call last):
  File "/Users/builder/external/VTK/Utilities/vtkTclTest2Py/rtImageTest.py", line 12, in <module>
    import vtk
  File "/Users/builder/external/VTK-clang-dbg-x86_64/lib/python2.7/site-packages/vtk.py", line 9, in <module>
    vtkmodules_m = importlib.import_module('vtkmodules')
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/Users/builder/external/VTK-clang-dbg-x86_64/lib/python2.7/site-packages/vtkmodules/__init__.py", line 15, in <module>
    import _vtkmodules_static
ImportError: No module named _vtkmodules_static

I don’t know much about CMake or Python. Can anyone help?

Thanks,

Sean

2

@ben.boeckel

3

So I tried different versions of CMake to squeeze the issue.

CMake 3.17.2 : good
CMake 3.17.5 : good
CMake 3.18.0 : good
CMake 3.18.1 : good
CMake 3.18.2 : bad
CMake 3.18.4 : bad
CMake 3.19.0 : bad
CMake 3.19.1 : bad

4

Just a guess, was there a change in Python versions between CMake 3.18.1 & 3.18.2 or the CMake VTK options at that point?
If I get messages like:

ImportError: No module named _vtkmodules_static

it may indicate a CMake Python option or Python version changed.

5

Nothing in the cmake release notes here jumps out to me:

https://cmake.org/cmake/help/latest/release/3.18.html#id2

I guess I could file a ticket with the cmake project…

Am I the only one seeing this issue? Maybe it’s Mac-only?

6

@seanm I don’t have a Mac but I am in the process of updating Python to Python 3.9 on Windows and Kubuntu.
If I update Python but don’t rebuild VTK to pick up the new version of Python I get this error when running a python script:

ModuleNotFoundError: No module named '_vtkmodules_static'

Once I rebuild VTK it is all Ok. When rebuilding VTK for a new version of Python I usually remove all Python related files then run CMake again.

Hope this helps.

7

Andrew, I’ve not touched my python installation at all. It’s just the ancient 2.7 version that comes with macOS.

8

There were some FindPython changes between 3.18.1 and 3.18.2. Is this still occurring today?

9

I haven seen any issues on Windows/Linux. I am using CMake 3.19.4. Just ran the Python tests now on Linux.

99% tests passed, 3 tests failed out of 724

...

The following tests FAILED:
        911 - VTK::FiltersModelingPython-TestImprintFilter (Failed)
        912 - VTK::FiltersModelingPython-TestImprintFilter2 (Failed)
        1962 - VTK::FiltersCorePython-TestWindowedSincPolylineSmoothing (Failed)
Errors while running CTest
10

That makes sense; I think those tests were fixed more recently on master.

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