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On my computer, itkMacro.h:47 has following content `#include `. That does not compile for you? That might be architecture-specific weirdness. That might come from misdetecting compiler. Check content of `vcl_compiler_detection.h`...

What source file/test is being compiled? And this looks like a warning, not an error message.

The most logical place would be `itkMacro.h`. And the bulk of the work would be changing the code to use the new macro. Also, use of a macro instead of...

Watershed filter tends to produce a lot of segments. It is probably not enough to just add an output image template type which defaults to the current output type. If...

Yes, I think that will do it.

As you are adding code, and 2 commits later removing some, it makes sense to squash these into a single commit. Less changes to look at that way. Also, you...

This test was sporadically failing in nightly dashboard. As the CI is green now, I guess this was a sporadic failure in the CI.

I don't think rebase can be done in GitHub WebUI. But it can be done in e.g. TortoiseGit and `gitk`.

It would probably be best if we passed in the path to a temporary directory and wrote the files there. Passing a temp path from CMakeLists.txt file should be easy.

I don't think there has been any progress on this front.