Hello,
I already had the VTK_MODULE_USE_EXTERNAL_VTKioss set to OFF. Adding the other two options let the build finish with VTK__EXTRA_COMPILER_WARNINGS=ON.
Yet, I still think, that it is a bug in VTK. The build shouldn’t just succeed if the user provides some specific configuration settings. VTK provides a bundled ioss library and sets the options for it to DEFAULT if not specified otherwise, so other modules can trigger the build if they need this module. So it should finish the build with these settings, shouldn’t it?
Also, eventually someone might need to have the IOIOSS IO module for loading files provided by ioss from another machine, but doesn’t need to have ioss installed on their machine, so disabling the settings wouldn’t be an option.
regards,
Bernd