The last few days I did test the builds of ITK 4.8.2 on powerpc and armhf - both without python bindings). Even so compiling took more than 24 hours, which means this was an experiment I'm not going to repeat soon.
On armhf I have only a Ubuntu 15.10 installation (g++ 4.8), it builds out of the box but the following tests fail: 66:itkPatchBasedDenoisingImageFilterTest0 467:itkPatchBasedDenoisingImageFilterTestGaussian 468:itkPatchBasedDenoisingImageFilterTestRician 469:itkPatchBasedDenoisingImageFilterTestPoisson 789:itkHDF5ImageIOTest 983:itkReadWriteSpatialObjectTest 984:itkReadWriteSpatialObjectTest1 985:itkReadWriteSpatialObjectTest2 1563:itkSingleLevelSetsv4DenseImage2DTest 1565:itkSingleLevelSetsv4WhitakerImage2DTest 1566:itkSingleLevelSetsv4WhitakerImage2DTestThreads 1568:itkSingleLevelSetsv4ShiImage2DTest 1569:itkSingleLevelSetsv4WhitakerImage2DWithCurvatureTest 1573:itkLevelSetsv4EquationPropagationTermTest 1574:itkLevelSetsv4EquationLaplacianTermTest 1586:itkMultiLevelSetsv4WhitakerImageSubset2DTest On powerpc the system was Debian/sid as of Saturday 2015/12/05. There was a problem with ITK_HAVE_SYNC_BUILTINS, I had to disable it, otherwise some atomic operations were not properly linked. This may be a problem with gcc. With this it compiled and the following tests failed: 531:itkDicomDifficultFile 663:itkFFTWF_FFTTest 664:itkFFTWF_RealFFTTest 665:itkVnlFFTWF_FFTTest 666:itkVnlFFTWF_RealFFTTest 757:itkGDCMImageIOTest1 760:itkGDCMImageIOTest4 770:itkGDCMImageIONoCrashTest 789:itkHDF5ImageIOTest 1037:itkIOTransformMatlabTest 1563:itkSingleLevelSetsv4DenseImage2DTest 1565:itkSingleLevelSetsv4WhitakerImage2DTest 1566:itkSingleLevelSetsv4WhitakerImage2DTestThreads 1568:itkSingleLevelSetsv4ShiImage2DTest 1569:itkSingleLevelSetsv4WhitakerImage2DWithCurvatureTest 1573:itkLevelSetsv4EquationPropagationTermTest 1574:itkLevelSetsv4EquationLaplacianTermTest 1586:itkMultiLevelSetsv4WhitakerImageSubset2DTest >From skimming over the logs I can say that there are all types of errors - some are about floating point accuracy, but others are real failures, like GDCM not understanding the input file, fftw not creating a plan etc.
