COMP: Use itk::IOComponentEnum and include vnl_svd.h for ITK 6 - #1294
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ITK removes itk::ImageIOBase::IOComponentType when ITK_LEGACY_REMOVE is ON, which ITK forces whenever it is built with wrapping enabled. The namespace-scope itk::IOComponentEnum is present in both ITK 5.4 and ITK 6, so this spelling builds against either. vtkPlusProbeCalibrationOptimizerAlgo used vnl_svd without including it, relying on an ITK header to pull it in transitively; ITK 6 no longer does. Include it directly.
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September 16, 2026 15:01
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Builds PlusLib against an ITK 6 that has
ITK_LEGACY_REMOVEon. Two changes, both valid on ITK 5.4 as well. Continues the ITK 6 compatibility work in #1279, #1280, #1282, and #1283.What breaks and why
itk::ImageIOBase::IOComponentTypeis a legacy alias, compiled out whenITK_LEGACY_REMOVEis defined. ITK declares that option asso any ITK built with wrapping enabled forces it ON, and the alias disappears.
itk::IOComponentEnumis the namespace-scope name; it exists in ITK 5.4 andITK 6 alike, aliasing
CommonEnums::IOComponent.vnl_svdwas used invtkPlusProbeCalibrationOptimizerAlgo.cxxwithoutincluding its header; it arrived transitively through an ITK header. ITK 6
trimmed those includes, so the file now includes
<vnl/algo/vnl_svd.h>directly.
Verification
Built against ITK
main(6.0.0.20260907) withITK_WRAP_PYTHON=ON, VTK 9.6,macOS arm64: 0 failed targets, 10 libraries.
Before the change the same tree failed 16 compiles, all on the removed alias,
then 1 on the missing
vnl_svdinclude.Not built against ITK 5.4 here, but
itk::IOComponentEnumis present in thatrelease and an explicit include is always valid, so neither change is
version-specific.
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