KSP Incremental Processing: Removing a file does not remove transitively generated files

[bcorso]

This issue came up in Dagger (google/dagger#4060). Say we have a class like this:

@HiltViewModel
class ProfileScreenViewModel @Inject constructor()

On the first build, we get the following source-to-output map:

  src/main/java/com/example/testhiltviewmodel/ProfileScreenViewModel.kt:
    build/.../ProfileScreenViewModel_Factory.java
    build/.../ProfileScreenViewModel_HiltModules.java
  <This is a virtual key for removed outputs; DO NOT USE>:
  build/.../ProfileScreenViewModel_HiltModules.java:
    build/.../_..._ProfileScreenViewModel_HiltModules_KeyModule.java
    build/.../_..._ProfileScreenViewModel_HiltModules_BindsModule.java
    build/.../ProfileScreenViewModel_HiltModules_KeyModule_ProvideFactory.java

Next, if we remove the ProfileScreenViewModel.kt and rebuild we get this:

  <This is a virtual key for removed outputs; DO NOT USE>:
  build/.../ProfileScreenViewModel_HiltModules.java:
    build/.../_..._ProfileScreenViewModel_HiltModules_KeyModule.java
    build/.../_..._ProfileScreenViewModel_HiltModules_BindsModule.java
    build/.../ProfileScreenViewModel_HiltModules_KeyModule_ProvideFactory.java

In particular, the generated sources from ProfileScreenViewModel.kt are removed, but the transitively generated sources, e.g. ProfileScreenViewModel_HiltModules, are not removed.

You can find a repro of this project in google/dagger#4060.

[ansman]

@ting-yuan Do you have an ETA for a new release? This is causing some annoying issues for us as cleaning the project isn't enough due to the build cache

[ting-yuan]

1.0.14 will be available no later than next week.

[ansman]

Thank you, I appreciate that 🙌