[CMake] Automate cleaning after CMAKE_DISABLE_IN_SOURCE_BUILD

[Ateljevich, Eli]

Hi everyone,
My CMakeLists.txt uses the undocumented features:
set(CMAKE_DISABLE_SOURCE_CHANGES ON)
set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)

The first one prevents in-source builds as expected (even in 2.6, which I wasn't expecting). I find this very useful. I'm not sure about the second one.

However, regardless of version it seems like artifacts are left in the /src directory. If the user does the smart-but-not-expert thing and backs out to /build and tries ../src, cmake fails again thinking that the output directory is still /src.

Is there a way to intercede earlier like Brad Kings "InSource.cmake" idea? Sorry if I missed any decisive documentation on this - it isn't that I see nothing on the subject, but rather a lot of stuff that doesn't look like it got implemented.

Barring that, is there a good way to clean up after the fact?

Thanks,
Eli


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