ninja clean does not delete files generated by rustc

[dilyanpalauzov]

I compile clamav 1.3.0 using the ninja generator (ccmake -GNinja) out-of-tree (VPATH build). Then I call ninja clean and ninja -t clean. Before ninja clean the build directory is 1.4Gb, afterwards it is 919Mb, with x86_64-unknown-linux-gnu being 700Mb.

I expect that ninja clean deletes everything, which the next run of ninja will create again.

[micahsnyder]

Interesting. I agree it should delete the files generated by rustc.

It seems like we may be able to solve this with ADDITIONAL_CLEAN_FILES

https://stackoverflow.com/questions/62450774/cmake-clean-additional-generated-files