All the stats below are for a hikey960-eng build on AOSP master.
Number of order-only inputs in out/soong/build.ninja:
Before: 2847162
After: 606508
Size of: Before After
out/soong/build.ninja 572MB 233MB -59%
out/soong/Android-hikey960.mk 15MB 9MB -40%
out/build-hikey960.ninja 367MB 358MB -2%
Ninja time in `m nothing`:
Before: 6.9s
After: 5.0s
Soong generation time:
Before: 11.6s
After: 6.6s
Test: m nothing
Test: wrote script that counted inputs, only duplicates were removed
Test: treehugger
Change-Id: I6b7c5ef5b1395014b7bf5fd0b8112d42bee127bf