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COMP: Report a VTK/ITK Python mismatch clearly in ITKVtkGlue #6983

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Merged
hjmjohnson merged 1 commit into from
Oct 23, 2026
+21 −1
Merged

COMP: Report a VTK/ITK Python mismatch clearly in ITKVtkGlue #6983

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22 changes: 21 additions & 1 deletion Modules/Bridge/VtkGlue/itk-module-init.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,27 @@
# but not required.
set(VERSION_MIN "9.1.0")

find_package(VTK ${VERSION_MIN} NO_MODULE REQUIRED)
find_package(VTK ${VERSION_MIN} NO_MODULE)
if(NOT VTK_FOUND)
message(
FATAL_ERROR
"Module_ITKVtkGlue requires VTK >= ${VERSION_MIN}. Set VTK_DIR to its CMake package directory.\n"
"${VTK_NOT_FOUND_MESSAGE}"
)
endif()
# Not REQUIRED, so a Python-wrapped VTK reports an unusable Python here instead of failing inside FindPython3.
if(VTK_WRAP_PYTHON AND DEFINED VTK_Python_FOUND AND NOT VTK_Python_FOUND)
message(
FATAL_ERROR
"The VTK at\n"
" ${VTK_DIR}\n"
"is Python-wrapped, but its Python is inconsistent with the selected one:\n"
" Python3_EXECUTABLE=${Python3_EXECUTABLE} (Python ${Python3_VERSION})\n"
" Python3_INCLUDE_DIR=${Python3_INCLUDE_DIR}\n"
" Python3_LIBRARY=${Python3_LIBRARY}\n"
"Set Python3_EXECUTABLE to the Python VTK was built with, or set Module_ITKVtkGlue=OFF."
)
endif()

# VTK 9 omits VTK_RENDERING_BACKEND; infer rendering support from its OpenGL2 target.
if(NOT VTK_RENDERING_BACKEND)
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