Gradle: Incremental compilation 101

on YouTube ↗48m

" summary

Research into incremental compilation for the Android toolchain compares concrete behaviors: Java’s class-based heuristic in Gradle recompiles changed classes plus any class that references them, so in a 250-class synthetic test ABI-compatible and incompatible edits show little top-level difference, while extracting an interface reduces rebuild scope; Gradle 6.0 narrows blast radius and Gradle 7.1 fixes public-constant explosions. Kotlin’s compiler uses symbol-based analysis, online inlining still forces callers to recompile, and enabling useClassSnapshot (Kotlin 1.6.20+; public in 1.7.20) yields about 12% raw build-time savings in profiled runs with Gradle Profiler.

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" chapters (11)

1. 0:00Start
2. 15:06Java IC: Synthetic Test
3. 15:37Android Studio poet
4. 18:28Java IC: Constants
5. 26:10Levels of Incrementality
6. 30:05Kotlin CA: Old Approach
7. 35:19Kotlin CA: Synthetic Test
8. 38:22What Did We Not Discuss?
9. 39:57How to Develop Your Project?
10. 44:19Parallel Build
11. 45:15Parallel Kotlin Compilation?

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