Store compile file stamps for each scala version #4987
Merged
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#4986 reported that +compile would
always recompile everything in the project even when the sources hadn't
changed. This was because the dependency classpath was changing between
calls to compile, which caused the external hooks cache introduced in
32a6d0d to invalidate the scala
library. To fix this, I cache the file stamps on a per scala version
basis. I added a scripted test that checks that there is no
recompilation in two consecutive calls to
+compile
in a multi scalaversion build. It failed prior to these changes.