The build system compares aidl files of every module to the previous
build and deletes the intermediate generated source dir if an aidl file
has gone.
Change-Id: I55fcfe1baaae3496613e12c20bca564d408bba58
This change cleans the packages' intermediate files if their overlays
changed between incremental builds.
If two builds have different overlay, they will have different R
classes, and so the jar files in the common intermediate dirs can
not be shared. Therefore incremental build can't be applied.
This change detects the overlay changes on package's base.
If a package's overlay is different from the previous build, its common
intermediate dir is nuked.
This makes broader incremental builds possible.
Change-Id: I368610ebbbbc85a80f9aecd714ab22cd78da7f12
Ying Wang