If you remove individual files in build/<conf>/hotspot, the HotspotWrapper.gmk does not see the need to trigger a recompile.

This could be solved by not just having an empty touch file, but by doing like "find build/<conf>/hotspot > build/<conf>/hotspot/.hotspot_marker" and the next time do "find build/<conf>/hotspot > temp-file" and comparing temp-file and .hotspot_marker.

Not sure if it's worth the effort, but it has been frustrating for me several times that removed files didn't trigger a recompile. It's a bit surprising, and it's an artifact of our wrapper, so I think it should be fixed. Don't know the performance penalty on Windows, though. Might be prohibitive.